Biography

Overview & Research Focus

Dr. Swarup Bag is a Professor in the Department of Mechanical Engineering at the Indian Institute of Technology (IIT) Guwahati. He joined the institute in 2011. He holds a Ph.D. in Mechanical Engineering from IIT Bombay, specializing in Manufacturing Science.

His primary research interests lie in the development of computational models and carrying out experimental investigations for fusion welding, laser microjoining, and additive manufacturing. He is specifically focused on understanding heat transfer, fluid flow, microstructural evolution, and residual stress generation in materials processing.

Prof. Bag is a dedicated educator, active NPTEL course instructor, and reviewer for several high-impact international journals in manufacturing and thermal sciences.

Key Research Areas: Finite Element Modeling (FEM) of fusion welding, Directed Energy Deposition (DED) based metal additive manufacturing, monitoring and defect prediction in Friction Stir Welding (FSW).

Areas of Expertise

Welding & Joining Microjoining & Microwelding Finite Element Method (FEM) Residual Stress & Distortion Recrystallization Additive Manufacturing Optimization Algorithms Heat Source Modelling

Academic & Experience

Chronological Professional History

Professional Experience

Visitor June 18 – July 14, 2024
Institute of Materials Joining, Shandong University, China
Visitor December 5 – December 12, 2023
Department of Mechanical Engineering, Gifu University, Japan
Professor August 2021 – Present
Department of Mechanical Engineering, IIT Guwahati, India
Visiting Scholar May 2018 - July 2018
Center for Advanced Materials Joining, University of Waterloo, Canada
Associate Professor March 2017 – August 2021
Department of Mechanical Engineering, IIT Guwahati, India
Assistant Professor May 2011 – March 2017
Department of Mechanical Engineering, IIT Guwahati, India
Post-Doctoral Research Fellow September 2009 – April 2011
Centre for Material Forming (CEMEF), Mines ParisTech, Sophia Antipolis, France
Senior Research Fellow April 2009 – August 2009
Mechanical Engineering Department, IIT Bombay, India

Education

Ph.D. in Mechanical Engineering (Manufacturing Science) 2009
Indian Institute of Technology (IIT) Bombay
Thesis: Development of bi-directional heat transfer and fluid flow model for reliable design of GTA and laser welding processes
M.E. in Mechanical Engineering (Production Engineering) 2002
Bengal Engineering College, Shibpur (IIEST Shibpur)
First Class with Distinction
B.E. in Mechanical Engineering 2000
Jalpaiguri Government Engineering College
First Class

Administrative Roles & Activities

Institutional Contributions & Memberships

Institute-Level Roles

  • Chairman, Technical Board (July 2024 - continuing) of IIT Guwahati
  • Faculty-in-charge (July 2024 - continuing) of Central Workshop, IIT Guwahati
  • IPPC member (as DPPC secretary - August 2019 to May 2024)
  • Associate Hostel Warden from December, 2014 to March, 2015
  • Hostel Warden from March, 2015 to April, 2017
  • Treasurer (2012 to 2014) and auditor (2014 to 2016) of IIT Club, IIT Guwahati
  • Vice president (2022 - 2024) of IIT Club, IIT Guwahati

Department-Level Roles

  • DPPC secretary (August 2019 - May 2024)
  • In charge of Advanced Welding Laboratory (PG)
  • Secretary of Departmental Faculty Meeting (From 2012 to 2017)
  • DPPC member (2012 to 2013)

Professional Memberships

  • American Society of Mechanical Engineers (ASME) - Member
  • Indian Institute of Welding (IIW) - Life Member
  • Indian Welding Society (IWS) - Life Member
  • Indian Society for Heat and Mass Transfer (ISHMT) - Life member

Reviewer of Scientific Journals

  • International Journal of Thermal Science (Elsevier)
  • Journal of Alloy and Compounds (Elsevier)
  • Welding in The World (Springer)
  • IMechE Part B: Journal of Engineering Manufacture (SAGE Publication)
  • Journal of the Institution of Engineers (India): Series C (Springer)
  • Science and Technology of Welding and Joining (Taylor & Francis)

Technical Committee Memberships

  • 3rd International Conference on Mechanic Automation and Control Engineering (MACE 2012), Baotou, Inner Mongolia, China

Teaching & MOOCs

Courses taught at IIT Guwahati & Online Lectures

Undergraduate Courses

  • ME 213: Engineering Materials
  • ME 222: Manufacturing Technology I
  • ME 312: Manufacturing Technology II
  • ME 324: Heat and Mass Transfer
  • ME 324:Industrial Engineering and Operations Research
  • ME 101: Engineering Mechanics (Tutorial)
  • ME 310: Mechanical Engineering Laboratory

Postgraduate Courses

  • ME 513: Physics of Manufacturing Processes
  • ME 679: Mechanical Behavior of Materials
  • ME 606: Solidification Processing
  • ME 675: Advanced Welding Processes
  • ME 628: Additive Manufacturing Technologies
  • ME 515: Manufacturing Laboratory

NPTEL MOOCs running in 2025

Introduction to Crystal Elasticity and Crystal Plasticity

Schedule: J anuary 2025

Mathematical Modelling of Manufacturing Processes

Schedule: July 2025

Advances in Welding and Joining Technologies

Schedule: July 2025

Finite Element Modelling of Welding Processes

Schedule: January 2025

Introduction to Solidification P rocessing

Schedule: January 2025

Materials Processing (Casting, Forming and Welding )

Schedule: July 2025

Key Educational Activities

  • Setup of Advanced welding laboratory (Micro-plasma arc welding setup)
  • Advanced Manufacturing laboratory course
  • Contributed to the contextual changes for Indian students for well known book - Introduction to Materials Science For Engineers authored by James F. Shackelford, Pearson publisher

Short Term Courses & Conference Roles

  • Recent Advances in Manufacturing Science and Technologies (22 Feb to 26 Feb' 2021)
  • Advances in Welding and Joining Technologies (29 Dec to 31 Dec' 2014)
  • Acted as treasurer on International Conference on Computational Methods in Manufacturing (ICCMM) (2019)
  • Act as treasurer on 8th International and 47th National Conference on Fluid Mechanics and Fluid Power (FMFP) (2020)

Research, Projects & Patents

Sponsored Funding & Intellectual Property

Sponsored Projects

ongoing

Prediction of electrode life and weld quality in resistance spot welding of bare and coated steels

TATA Steel Limited | 2023 - 2025

Role: Principal Investigator (PI)

Funding Agency: TATA Steel Limited

Project Duration: 2023 - 2025

ongoing

Development of multi-material wire arc additive manufacturing process including the effect of multi-physics problem of droplet interaction, metallurgical model and free surface profile using phase field method

SERB (SUPRA) | 2022 - 2025

Role: Principal Investigator (PI), Co-PI: Dr. Sajan Kapil

Funding Agency: SERB (SUPRA)

Project Duration: 2022 - 2025

completed

Development of a numerical model and the stability analysis of dynamic keyhole in deep penetration laser welding process using the phase-field method

SERB (MATRICS) | 2021 - 2024

Role: Principal Investigator (PI)

Funding Agency: SERB (MATRICS)

Project Duration: 2021 - 2024

completed

Development of portable micro-friction stir welding machine as green technology

DSIR (TOCIC) | 2020 - 2022

Role: Principal Investigator (PI)

Funding Agency: DSIR (TOCIC)

Project Duration: 2020 - 2022

completed

A wire feeding device for TIG/Plasma/Laser cladding

NEWGEN IEDC | Dec 2020 - Dec 2021

Role: Co-PI (PI: Dr. Sajan Kapil)

Funding Agency: NEWGEN IEDC

Project Duration: Dec 2020 - Dec 2021

completed

Experimental investigation and numerical modelling of plasma micro welding for similar type materials

SERB (Fast Track) | July 2013 - June 2016

Role: Principal Investigator (PI)

Funding Agency: SERB (Fast Track)

Project Duration: July 2013 - June 2016

completed

RURBAN Mission - Arunachal Pradesh (Consultancy)

Ministry of Rural Development | June 2016 - Aug 2016

Role: Project Member (PI: Prof. S. K. Kakoty)

Funding Agency: Ministry of Rural Development

Project Duration: June 2016 - Aug 2016

completed

RuTAG-NE (Rural Technology and Action Group North-East States)

DST | Dec 2014 - March 2017

Role: Co-Coordinator (PI: Prof. S. K. Kakoty)

Funding Agency: DST

Project Duration: Dec 2014 - March 2017

completed

Development of turbulent transport model in autogenous fusion welding process

IIT Guwahati (Institute Start-up) | Dec 2011 - Nov 2013

Role: Principal Investigator (PI)

Funding Agency: IIT Guwahati (Institute Start-up)

Project Duration: Dec 2011 - Nov 2013

Patents & Designs

Method and apparatus for high-frequency induction welding

App No: 202131039107

Applicants: Ankan Mishra, S K Biswal, S Pal, and S Bag

Multi-utility FSW tool shank with interchangeable tool probe

App No: 202231049902

Applicants: Debtanay Das, S Bag, and S Pal

An economical and portable μ-FSW setup

App No: 202231048830

Applicants: Debtanay Das, and S Bag

FSW tool with modified tool shoulder.

App No: 202331012303

Applicants: Debtanay Das, S Bag, and S Pal

Friction stir welding tool.

App No: 385291-001

Applicants: Debtanay Das, S Bag, and S Pal

Micro friction stir welding machine.

Design No: 385292-001

Applicants: Debtanay Das, and S Bag

Publications

Full list of publications indexed chronologically

International Journal Journal

A Kumar, R Sarma, S Bag, VC Srivastava, S Kapil: Physics-informed machine learning models for the prediction of transient temperature distribution of ferritic steel in directed energy deposition by cold metal transfer, Science and Technology of Welding and Joining (Taylor and Francis) 1-9.

International Journal Journal

AK Sahu, S Bag: Influence of heat input on intermetallic formation in dissimilar autogenous laser welding between Inconel 718 and AISI 316L steel, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture (SAGE) 237, 1422-1435.

International Journal Journal

R Sarma, AK Singh, S Kapil, S Bag, SN Joshi: Evolution of near homogenous mechanical and microstructural properties in wire-arc based directed energy deposition of low carbon steel following trochoidal trajectory toolpath, Journal of Materials Processing Technology (Elsevier) 315, 117921.

International Journal Journal

D Das, S Bag, S Pal: Probing finite element modelling of defects in friction stir welding by tailoring mass scaling factor, Materials Today Communications (Elsevier) 35, 105646.

International Journal Journal

CJ Chittilappilly, S Bag, A Karani: Evaluation of liquid metal embrittlement-free weld by micro-plasma arc welding of Zn-coated interstitial free steel, Welding International (Taylor and Francis) 1-30.

International Journal Journal

AK Prasad, S Kapil, S Bag: Tailoring coil geometry for secondary heating of substrate towards the development of induction heating-based wire additive manufacturing, Science and Technology of Welding and Joining (Taylor and Francis) 28 (3), 209-217.

International Journal Journal

D Das, S Bag, S Pal, A Sharma: Material Defects in Friction Stir Welding through Thermo–Mechanical Simulation: Dissimilar Materials with Tool Wear Consideration, Materials (MDPI) 16 (1), 301.

International Journal Journal

B Kumar, S Bag, M Ruhul Amin: Evaluation of Phase Transformation Strain and Its Influence on Residual Stress Generation in Laser Welded Ti–6Al–4V Alloy, Journal of Manufacturing Science and Engineering (ASME)144 (12), 121002.

International Journal Journal

S Dwibedi, S Bag: Influence of process parameters on microstructural evolution, solidification mode, and impact strength in joining of stainless steel thin sheets, Advances in Materials and Processing Technologies (Taylor and Francis) 8 (sup 3 ), 1089-1104.

International Journal Journal

B Kumar, S Dwibedi, S Bag: On the interaction of cooling rate with thermal-microstructural-mechanical characteristics of laser-welded α+ β titanium alloy, Advances in Materials and Processing Technologies (Taylor and Francis) 8 (sup 2 ), 774-789.

International Journal Journal

B Kumar, S Dwibedi, S Bag, M Mahapatra, R Gupta: A comparative study on microstructural and mechanical behaviour of spot welded Ti-6Al-4V alloy in as-welded and solution treated condition, Advances in Materials and Processing Technologies (Taylor and Francis) 8 (3), 2637-2651.

International Journal 2022

A K Prasad, S Kapil and S Bag: Critical conditions for melting of metallic wire in induction heating system through numerical simulation and experiments, Journal of Manufacturing Processes (Elsevier), 77, 678-693, 2022.

International Journal 2022

D Das, S Bag, and S Pal: A Finite Element Model for the Prediction of Chip Formation and Surface Morphology in Friction Stir Welding Process, Journal of Manufacturing Science and Engineering (ASME), 144 (4), 041015 ( 1 - 11), 2022.

International Journal 2021

D Das, S Bag, and S Pal: Investigating surface defect by tool-material interaction in friction stir welding using coupled Eulerian-Lagrangian approach, Manufacturing Letters (Elsevier), 30, 23-26, 2021.

International Journal 2021

A K Sahu and S Bag: Influence of current pulsation on solidification parameters during micro-plasma arc welding of thin sheet Alloy 718. Welding in the World (Springer), 65 (12), 2403-2419, 2021.

International Journal 2021

A K Sahu and S Bag: Design of a double aging treatment for the improvement of mechanical and microstructural properties of pulse micro-plasma arc welded alloy 718. Journal of Material Science (Springer), 56, 13400–13415 (2021).

International Journal 2021

AK Mondal, B Kumar, S Bag, Y Nirsanametla, and P Biswas: Development of avocado shape heat source model for finite element based heat transfer analysis of high-velocity arc welding process, International Journal of Thermal Sciences (Elsevier), 166, 107005, 2021.

International Journal 2021

B Kumar, S Dwibedi, and S Ba g: On the interaction of cooling rate with thermal-microstructural-mechanical characteristics of laser-welded α+ β titanium alloy, Advances in Materials and Processing Technologies (Taylor and Francis), 2021.

International Journal 2021

S Dwibedi and S Bag: Influence of process parameters on microstructural evolution, solidification mode, and impact strength in joining of stainless steel thin sheets, Advances in Materials and Processing Technologies (Taylor and Francis), 2021.

International Journal 2021

B Kumar, S Dwibedi, S Bag, M Mahapatra, and R Gupta: A comparative study on microstructural and mechanical behaviour of spot welded Ti-6Al-4V alloy in as-welded and solution treated condition, Advances in Materials and Processing Technologies (Taylor and Francis), 2021.

International Journal 2021

D Das, S Bag, and S Pal: A finite element model for surface and volumetric defects in the FSW process using a coupled Eulerian–Lagrangian approach, Science and Technology of Welding and Joining (Taylor and Francis), 2021.

International Journal 2021

A K Mondal, B Kumar, S Bag, N. Yadaiah and P Biswas: Development of avocado shape heat source model for finite element based heat transfer analysis of high-velocity arc welding process, International Journal of Thermal Sciences (Elsevier), 2021.

International Journal 2021

S. Dwibedi and S Bag: Development of micro-plasma arc welding system for different thickness dissimilar austenitic stainless steels, Journal of The Institution of Engineers (India): Series C (Springer), 2021.

International Journal 2021

B. Kumar, S. Bag, S. Mahadevan, C. P. Paul, C. R. Das and K. S. Bindra: On the interaction of microstructrural morphology with residual stress in fiber laser welding of austenitic stainless steel, CIRP Journal of Manufacturing Science and Technology (Elsevier), 33(5), 158 - 175, 2021.

International Journal 2020

S Kapil, F Legesse, S Negi, KP Karunakaran, and S Bag: Hybrid layered manufacturing of a bimetallic injection mold of P20 tool steel and mild steel with conformal cooling channels, Progress in Additive Manufacturing, 1-16, 2020.

International Journal 2020

B. Kumar, S. Bag, C. P. Paul, C. R. Das, R. Ravikumar and K. S. Bindra: Influence of the mode of laser welding parameters on microstructural morphology in thin sheet Ti6Al4V alloy, Optics & Laser Technology (Elsevier), 131, 106456 (1 - 14), 2020.

International Journal 2020

A. K. Sahu, S. Bag and Ke Huang: Mitigation of micro-cracks in dissimilar welding of Inconel 718 and austenitic stainless steel, Philosophical Magazine Letters (Taylor & Francis), 365-374, 100(8), 2020.

International Journal 2020

A. K. Sahu and S. Bag: Probe pulse conditions and solidification parameters for the dissimilar welding of Inconel 718 and AISI 316L stainless steel, Metallurgical and Materials Transactions A (Springer), 51(5), 2192 - 2208, 2020.

International Journal 2020

S. Bag and M. Ruhul Amin: Investigation on ultra-short pulse laser welding of dissimilar metallic materials expending phase lag influence, Journal of Thermal Science and Engineering Applications (ASME), 12(5), 051014(1-14), 2020.

International Journal 2020

S. Bag, C. DiGiovanni, X. Han and Y. N. Zhou: A phenomenological model of resistance spot welding on liquid metal embrittlement severity using dynamic resistance measurement, Journal of Manufacturing Science and Engineering (ASME), 142(3), 031007(1-13), 2020.

International Journal 2019

C. DiGiovanni, S. Bag, C. Mehling, K.W. Choi, A. Macwan, E. Biro, Y.N. Zhou: Reduction in liquid metal embrittlement cracking using weld current ramping, Welding in the World (Springer), 63(6), 1583-1591, 2019.

International Journal 2019

E. Wintjes, C. DiGiovanni, L. He, S. Bag, F. Goodwin, E Biro, N.Y. Zhou: Effect of multiple pulse resistance spot welding schedules on liquid metal embrittlement severity, Journal of Manufacturing Science and Engineering (ASME),141(10), 101001(1-9), 2019.

International Journal 2019

S. Chowdhury, Y. Nirsanametla, M. Muralidhar, S. Bag and S. K. Patra: Influence of weld parameters on weld regimes and vaporization rate in electron beam welding of Ti6Al4V alloy, Journal of the Brizilan Society of Mechanical Sciences and Engineering (Springer), 41(4), 180, 2019.

International Journal 2019

B. Kumar and S. Bag: Phase transformation effect in distortion and residual stress of thin-sheet laser welded Ti-alloy, Optics and Lasers in Engineering (Elsevier), 122, 209-224, 2019.

International Journal 2019

B. Das, S. Pal and S. Bag: Probing defects in friction stir welding process using temperature profile, Sadhana (Indian Academy of Science), 44, 79, 2019.

International Journal 2019

T. Saikia, M. Baruah and S. Bag: On the effect of heat input in plasma microwelding of maraging steel, Proceedings of IMechE, Part B: Journal of Engineering Manufacture (SAGE), 233(3), 807-822, 2019.

International Journal 2018

B. Das, S. Pal and S. Bag: Monitoring of friction stir welding process using main spindle motor current, Journal of The Institution of Engineers (India): Series C (Springer), 99(6), 711-716,2018.

International Journal 2018

A K Mondal, A Lohit, P Biswas, S Bag and M Das: Prediction of weld-induced distortion of large structure using equivalent load technique, Proceedings of IMechE, Part B: Journal of Engineering Manufacture (SAGE), 232(3), 499 - 512, 2018.

International Journal 2018

D Yaduwanshi, S Bag and S Pal: On the effect of tool offset in hybrid FSW of copper and aluminium alloy, Materials and Manufacturing Processes (Taylor & Francis), 33(3), 277 - 287, 2018.

International Journal 2018

B. Kumar, D. Kebede and S. Bag: Microstructure evolution in thin sheet laser welding of titanium alloy, International Journal of Mechatronics and Manufacturing Systems (Inderscience), 11(2/3), 203-229, 2018.

International Journal 2017

M. Baruah, S. Bag and S Kumar: Probing phase lag effect in ultra-short pulse laser heating of nano-film, Manufacturing Letters (Elsevier), 13, 6 - 10, 2017.

International Journal 2017

A K Mondal, P Biswas, S Bag: Prediction of welding sequence induced thermal history and residual stresses and their effect on welding distortion, Welding in the World (Springer), 61(4), 711 - 721, 2017.

International Journal 2017

M. Baruah and S. Bag: Characteristic difference of thermo-mechanical behavior in plasma microwelding of steels, Welding in the World (Springer), 61(4), 857 - 871, 2017.

International Journal 2017

B. Das, S. Pal and S. Bag: Torque based defect detection and weld quality modelling in friction stir welding process, Journal of Manufacturing Processes (Elsevier), 27, 8 - 17, 2017.

International Journal 2017

B. Das, S. Pal and S. Bag: Design and development of force and torque measurement setup for real time monitoring of friction stir welding process, Measurement (Elsevier), 103, 186 - 198, 2017.

International Journal 2017

B. Das, S. Bag and S. Pal: Probing weld quality monitoring in frictionstir welding through characterization of signals by fractal theory, Journal of Mechanical Science and Technology (Springer), 31(5), 2459 - 2465, 2017.

International Journal 2017

M. Baruah and S. Bag: Influence of pulsation in thermo-mechanical analysis on laser microwelding of Ti6Al4V alloy, Optics & Laser Technology (Elsevier), 90, 40 - 51, 2017.

International Journal 2017

B. Das, S. Pal and S. Bag: Weld quality prediction in friction stir welding using wavelet analysis, International Journal of Advanced Manufacturing Technology (Springer), 89(1), 711 - 725, 2017.

International Journal 2017

A K Mondal, P Biswas and S Bag: Prediction and comparative study of submerged arc weld induced residual stress and angular deformation of single and double sided fillet welded joint using finite element analysis, International Journal of Steel Structures (Springer), 17(1), 9 - 18, 2017.

International Journal 2016

M. Baruah and S. Bag: Microstructural influence on mechanical properties in plasma microwelding of Ti6Al4V alloy, Journal of Materials Engineering and Performance (Springer), 25(11), 4718 - 4728, 2016. Link to view

International Journal 2016

B. Das, S. Pal and S. Bag: Defect detection if friction stir welding process using signal information and fractal theory, Procedia Engineering (Elsevier), 144, 172 - 178, 2016.

International Journal 2016

S. Kumar, S. Bag and M. Baruah: Finite element model for femtosecond laser pulse heating using dual phase lag effect, Journal of Laser Applications (AIP), 28(3), 032008:1 - 14, 2016.

International Journal 2016

B. Das, S. Pal and S. Bag: A combined Wavelet packet and Hilbert-Huang transform for defect detection and modelling of weld strength in friction stir welding process, Journal of Manufacturing Processes (Elsevier), 22, 260-268, 2016.

International Journal 2016

M. Baruah and S. Bag: Influence of heat input in microwelding of titanium alloy by micro plasma arc, Journal of Materials Processing Technology (Elsevier), 231, 100 - 112, 2016.

International Journal 2016

N Yadaiah, S Bag, C. P. Paul and L. M. Kukreja: Influence of self-protective atmosphere in fiber laser welding of austenitic stainless steel, International Journal of Advanced Manufacturing Technology (Springer), 86(1), 853 - 870, 2016. Link to view

International Journal 2016

D Yaduwanshi, S Bag and S Pal: Numerical modeling and experimental investigation on plasma-assisted hybrid friction stir welding of dissimilar materials, Materials & Design (Elsevier), 92, 166 - 183, 2016.

International Journal 2016

B Das, S Bag and S Pal: Defect detection in friction stir welding process through characterization of signals by fractal dimension, Manufacturing Letters (Elsevier), 7, 6-10, 2016.

International Journal 2016

B Das, S Pal and S Bag: Monitoring of friction stir welding process using weld image information, Science and Technology of Welding and Joining (Taylor & Francis), 21(4), 317-324, 2016.

International Journal 2016

J Kalivarapu, S Jain and S Bag: An improved harmony search algorithm with dynamically varying bandwidth, Engineering Optimization (Taylor & Francis), 48(7), 1091-1108, 2016.

International Journal 2015

A K Mondal, P Biswas, S Bag: Influence of tacking sequence on residual stress and distortion of single sided fillet submerged arc welded joint, Journal of Marine Science and Application (Springer), 14 (3), 250-260, 2015.

International Journal 2015

D. Yaduwanshi, S. Bag and S. Pal: Heat transfer analyses in friction stir welding of aluminum alloy, Proceedings of IMechE, Part B: Journal of Engineering Manufacture (SAGE), 229 (10), 1722-1733, 2015.

International Journal 2014

D. Yaduwanshi, S. Bag and S. Pal: Effect of preheating in hybrid friction stir welding of aluminum alloy, Journal of Materials Engineering and Performance (Springer), 23(10), 3794 - 3803, 2014. Link to view

International Journal 2014

N. Yadaiah and S. Bag: Development of egg-configuration heat source model in numerical simulation of autogeneous fusion welding processes, International Journal of Thermal Sciences (Elsevier), 86(12), 125 -138, 2014. ScienceDirect top 25 list of most downloaded articles (Rank 8th for July-September, 2014 and 19th for October-December, 2014)

International Journal 2014

S. Singh, N. Yadaiah, S. Bag and S. Pal: Numerical simulation of welding induced residual stress in fusion welding using adaptive volumetric heat source, Proceedings of IMechE, Part C: Journal of Mechanical Engineering Science (SAGE), 228(16), 2960-2972, 2014.

International Journal 2014

R. S. Desai and S. Bag: Influence of displacement constraints in thermomechanical analysis of laser micro-spot welding process, Journal of Manufacturing Processes (Elsevier), 16(2), 264-275, 2014.

International Journal 2013

A. Ghosh, N. Barman, H. Chattopadhyay and S. Bag: Modelling of heat transfer in submerged arc welding process, Proceedings of IMechE, Part B: Journal of Engineering Manufacture (SAGE), 227(10), 14767-1473, 2013.

International Journal 2013

N. Yadaiah and S. Bag: Role of oxygen as surface active element in linear GTA welding process, Journal of Materials Engineering and Performance (Springer), 22(11), 3199-3209, 2013. Link to view

International Journal 2013

M. Baruah and S. Bag: Numerical modelling of heat transfer and fluid flow in laser microwelding, International Journal of Mechatronics and Manufacturing Systems (Inderscience), 6(13), 310 - 334, 2013.

International Journal 2069

N. Yadaiah and S. Bag: Effect of heat source parameters in thermal and mechanical analysis of linear GTA welding process, ISIJ International (Iron and Steel Institute of Japan), 52 (11), 2069-2075, 2012.

International Journal 2012

S. Bag, D. V. Kiran, Arshad A. Syed and A. De: Efficient estimation of volumetric heat source in fusion welding process simulation, Welding in the World (Springer), 56(11/12), 88 - 97, 2012.

International Journal 2012

R. E Logé, P Bernard, K Huang, S Bag and M Bernacki: Mean Field and Finite Element Modeling of Static and Dynamic Recrystallization, Materials Science Forum, 715 -716, 737, 2012.

International Journal 2011

P. Bernard, S. Bag, K. Huang and R. Logé: A two-site mean field model of discontinuous dynamic recrystallization, Materials Science and Engineering A (Elsevier), 528(24), 7357 - 7367, 2011.

International Journal 2011

S. Bag: A perspective review on laser assisted microjoining, Recent Patents on Mechanical Engineering, 4(2), 153 – 167, 2011.

International Journal 2010

S. Bag and A. De: Probing reliability of transport phenomena based heat transfer and fluid flow analysis in autogeneous fusion welding process, Metallurgical and Materials Transactions A (Springer), 41A(9), 2337 - 2347, 2010. Link to view

International Journal 2009

S. Bag and A. De: Error analysis of forward and reverse heat conduction and convection calculations considering uncertainties in welding, Science and Technology of Welding and Joining (Taylor & Francis), 14(9), 662-668, 2009.

International Journal 1923

S. Bag, A. Trivedi and A. De: Development of a finite element based conduction mode heat transfer model for laser welding process using an adaptive volumetric heat source, International Journal of Thermal Science (Elsevier), 48(10), 1923-1931, 2009.

International Journal 2009

S. Bag, A. De and T. DebRoy: A genetic algorithm assisted inverse convective heat transfer model for tailoring weld geometry, Materials and Manufacturing Processes (Taylor & Francis), 24(3), 384-397, 2009.

International Journal 2009

S. Bag and A. De: Development of an efficient numerical heat transfer model coupled with genetic algorithm based optimization for the prediction of process variables in GTA spot welding, Science and Technology of Welding and Joining (Taylor & Francis), 14(4), 333-345, 2009.

International Journal 2008

S. Bag and A. De: Development of a three-dimensional heat transfer model for GTAW process using finite element method coupled with a genetic algorithm based identification of uncertain input parameters, Metallurgical and Materials Transactions A (Springer), 39A(11), 2698-2710, 2008. Link to view

International Journal 2008

S. Bag, A. Trivedi and A. De: Use of multivariate optimization algorithm to develop self-consistent numerical heat transfer model for laser spot welding, International Journal of Advanced Manufacturing Technology (Springer), 38, 575-585, 2008. Link to view

International Journal 2007

A. Trivedi, S. Bag and A. De: Three dimensional transient heat conduction and thermomechanical analysis for laser spot welding using adaptive heat source, Science and Technology of Welding and Joining (Taylor & Francis), 12(1), 24 - 31, 2007.

Book / Chapter 2020

S Bag and E Akinlabi: Eco friendly aspects in hybridization of friction stir welding technology for dissimilar metallic materials, In: Hashmi, Saleem and Choudhury, Imtiaz Ahmed (eds.). Encyclopedia of Renewable and Sustainable Materials (Oxford: Elsevier), 1, 225–236, 2020.

Book / Chapter 2020

A Mishra, S Bag and S Pal: High frequency induction heating in sustainable manufacturing and material processing technologies - A state of the art literature review, In: Hashmi, Saleem and Choudhury, Imtiaz Ahmed (eds.). Encyclopedia of Renewable and Sustainable Materials (Oxford: Elsevier), 1, 343–357, 2020.

Book / Chapter 2020

A Mishra, S Pal and S Bag: Electromagnetic transient-thermal modeling of high-frequency induction welding of mild steel plates, In: M S Shunmugam and M Kanthababu (eds.). Advances in Simulation, Product Design and Development (Springer), Chapter 32, 407 - 415, 2020.

Book / Chapter 2020

B Kumar, R Nawani and S Bag: Effect of mechanical constraints on thermo-mechanical behaviour of laser-welded dissimilar joints, In: M S Shunmugam and M Kanthababu (eds.). Advances in Simulation, Product Design and Development (Springer), Chapter 32, 407 - 415, 2020.

Book / Chapter 2020

A K Sahu and S Bag: Effect of pre-weld solution treatment on mechanical properties and microstructure of micro-plasma arc welded Inconel 718, In: M S Shunmugam and M Kanthababu (eds.). Advances in Additive Manufacturing and Joining (Springer), 373 - 383, 2020.

Book / Chapter 2020

S Dwibedi, S Bag, D K Lodhi and A Kalita: Joining of different thickness dissimilar materials SS 316L/SS 310 by micro-PAW process, In: M S Shunmugam and M Kanthababu (eds.). Advances in Additive Manufacturing and Joining (Springer), 569 - 578, 2020.

Book / Chapter 2019

B Kumar and S Bag: Effect of pulsation on temperature distribution of laser-welded dissimilar joint of thin sheet, In: R G Narayanan, S N Joshi and U S Dixit (eds.). Advances in Computational Methods in Engineering (Springer), 165 - 178, 2019.

Book / Chapter 2019

A K Sahu and S Bag: Finite element modeling and experimental verification of dissimilar joining between Inconel 718 and SS 316L by micro-plasma arc welding, In: R G Narayanan, S N Joshi and U S Dixit (eds.). Advances in Computational Methods in Engineering (Springer), 231 - 243, 2019.

Book / Chapter 2019

M Baruah and S Bag: Laser Microwelding of Titanium alloy, Application of Lasers in Manufacturing, Edited by U. S. Dixit, S. N. Joshi and J. Paulo Davim in Applications of Lasers in Manufacturing (Springer), 69-94, 2019.

Book / Chapter 2017

U S Dixit and S Bag: Special Theme: Modelling of Manufacturing Processes, Journal of The Institution of Engineers (India): Series C (Springer), 98(1), 3 - 4, 2017.

Book / Chapter 2015

S Jain, J Kalivarapu and S Bag: Development of self-consistent multi-objective harmony search algorithm, Edited by B.K. Panigrahi, P.N. Suganthan, S. Das in Swarm, Evolutionary, and Memetic Computing, LNCS 8947, Chapter 48, Springer, 2015.

Book / Chapter 2015

D K Yaduwanshi, S Bag and S Pal: Hybrid Friction Stir Welding of Similar and Dissimilar Materials, Edited by R. G. Narayanan and U. S. Dixit in Advances in Material Forming and Joining, Springer, 323-349, 2015.

Book / Chapter 2015

B Das, S Pal and S Bag: Monitoring of Weld Quality in Friction Stir Welding Based on Spindle Speed and Motor Current Signals, Edited by R. G. Narayanan and U. S. Dixit in Advances in Material Forming and Joining, Springer, 233-253, 2015.

Book / Chapter 2015

A K Mondal, P Biswas, S Bag and M M Mohapatra: Prediction of Weld-Induced Angular Distortion of Single-Sided and Double-Sided Fillet Joints by SAW Process, Edited by R. G. Narayanan and U. S. Dixit in Advances in Material Forming and Joining, Springer, 203-220, 2015.

Book / Chapter 2015

Y Nirsanametla, S Bag, C P Paul and L M Kukreja: Fiber Laser Welding in a Controlled Inert Gas Atmosphere: An Experimental and Numerical Investigation, Edited by S. N. Joshi and U. S. Dixit in Lasers Based Manufacturing, Springer, 399-419, 2015.

Book / Chapter 2014

S Bag, D Yaduwanshi and S Pal: Heat transfer and material flow in friction stir welding process, Edited by Besharati-Givi & Asadi in Advances in Friction- Stir Welding and Processing, Woodhead Publishing, Chapter 2, 2014.

Book / Chapter 2013

S. Bag and A. De: Computational models for GTA and laser welding processes, Lap-Lambert Academic Publishing Co. Ltd., Germany, ISBN 978-3-659-42994-1, 2013.

Book / Chapter 2010

S Bag and A De: Computational modeling of conduction mode laser welding process, Edited by Xiaodong Na in Laser Welding: ISBN 978-953-307-129-9, Chapter 6: 133-160, 2010.

Int. Conference Conference

A Kumar, S Bag, VC Srivastava, MR Amin: Thermo-Mechanical Behavior of Multi-Layer Deposition for Wire Arc Additive Manufacturing of Structural Steel: Wire Arc Additive Manufacturing, IMECE, October 30 - November 3, 202 2, Greater Columbus Convention Center, Columbus, OH, USA.

Int. Conference Conference

B Kumar, S Bag, MR Amin: Influence of Volumetric Dilation of Microstructural Phases on Residual Stress Distribution in Laser Welded Ti-Alloy, IMECE, November 1- 5, 202 1, Virtual, Online

Int. Conference 2020

D. Das, S. Bag, S. Pal and M. R. Amin: Prediction of Surface Profile in Friction Stir Welding Using Coupled Eulerian and Lagrangian Method, IMECE, November 16-19, 2020, Virtual, Online

Int. Conference 2019

S. Bag and M. R. Amin: Development of an arbitrary adaptive volumetric heat source model for keyhole mode laser welding process, IMECE 18, November 9-15, 2019, Salt Lake City, Utah, USA.

Int. Conference 2019

B Kumar and S Bag: Effect of pulsation on temperature distribution of laser-welded dissimilar joint of thin sheet, ICCMM 2019, 8 - 9 March 2019, IIT Guwahati, India.

Int. Conference 2019

A K Sahu and S Bag: Finite element modeling and experimental verification of dissimilar joining between Inconel 718 and SS 316L by micro-plasm arc welding, ICCMM 2019, 8 - 9 March 2019, IIT Guwahati, India.

Int. Conference 2018

S. Bag and M. R. Amin: Thermal stress associated with non-Fourier heat conduction in femtosecond laser heating of multilayer metallic films, IMECE 18, November 9-15, 2018, Pittsburgh, PA, USA.

Int. Conference 2018

A. K Sahu and S. Bag: Effect of pre-weld solution treatment on mechanical and microstructural properties of µ-plasma arc welded Inconel 718, AIMTDR 2018, December 13-15, 2018, Chennai.

Int. Conference 2018

A. Mishra, S. Pal and S. Bag: Electro-magnetic transient-thermal modeling of high-frequency induction welding of mild steel plates, AIMTDR 2018, December 13-15, 2018, Chennai.

Int. Conference 2018

B. Kumar, R. Nawani and S. Bag: Effect of mechanical constraints on thermo mechanical behaviour of laser welded dissimilar joints, AIMTDR 2018, December 13-15, 2018, Chennai.

Int. Conference 2018

S Dwibedi, S. Bag, D K Lodhi and A Kalita: Joining of different thickness dissimilar materials SS 316L/SS310 by µ-PAW process, AIMTDR 2018, December 13-15, 2018, Chennai.

Int. Conference 2017

B. Kumar, M. Baruah and S. Bag: On the effect of heat input in cooling rate and microstructure of laser welded Ti-6Al-4V alloy, Advances in Materials & Processing Technologies, December 11-14, 2017, Chennai, India.

Int. Conference 2017

S. Bag, D. K. Yaduwanshi and S. Pal: Role of physical variables in dynamic recrystallization during friction stir welding of aluminium alloy, Advances in Materials & Processing Technologies, December 11-14, 2017, Chennai, India.

Int. Conference 2017

A. Sahu and S. Bag: Micro-plasma Arc welding of Inconel718 thin Sheets, 5 th International Congress of the International Institute of Welding, 7 th - 9 th December, 2017, Chennai, India.

Int. Conference 2017

S. Bag: Feasibility of dissimilar microwelding using femtosecond pulse laser, 5 th International Congress of the International Institute of Welding, 7 th - 9 th December, 2017, Chennai, India.

Int. Conference 2017

B. Das, S. Pal and S. Bag: Weld defect identification in friction stir welding using power spectral density, International Conference on Recent Advances in Materials & Manufacturing Technologies (IMMT 2017), 28 th - 29 th November, 2017, Dubai.

Int. Conference 2017

S. Bag: Microscale heat transfer in fusion welding of glass by ultra-short pulse laser using dual phase lag effects, International Conference on Recent Advances in Materials & Manufacturing Technologies (IMMT 2017), 28 th - 29 th November, 2017, Dubai. (IOP Conference Series)

Int. Conference 2017

S. Bag and M. R. Amin: Simulation based study on ultra-short pulse laser welding of dissimilar materials expending phase lag influence, IMECE 17, November 3 - 9, 2017, Tampa, Florida, USA.

Int. Conference 2016

B. Das, S. Pal and S. Bag: Wavelet transform based defect identification in friction stir welding process, AIMTDR 2016, 16 th - 18 th December, 2016, Pune.

Int. Conference 2016

M. Baruah and S. Bag: Analysis of temperature of microplasma arc welding of 0.5 mm Ti6Al4V sheets, 1rst International Conference on Materials, Manufacturing and Design Engineering (iCMMD 2016), 20 – 21 th December, 2016, Vidyavihar, Raigad, Maharashtra, India.

Int. Conference 2016

M. Baruah and S. Bag: Effect of peak power on joint characteristics of pulse laser welding of 0.5 mm Ti6Al4V sheets, AIMTDR 2016, 16 th - 18 th December, 2016, Pune.

Int. Conference 2016

B. Das, S. Pal and S. Bag: Machine vision system based monitoring approach for friction stir welding process, IEEE first international Conference on Control, Measurement and Instrumentation (CMI 2016), 8 - 10 th January, 2016, Jadavpur University, Kolkata. ( DOI:

Int. Conference 2016

1109/CIM.2016.7413715 )

Int. Conference 2015

B. Das, S. Pal and S. Bag: Defect detection in friction stir welding process using signal information and fractal theory, 12 th International Conference on Vibration Problems (ICOVP 2015), 14 - 17 th December, 2015, IIT Guwahati, Assam.

Int. Conference 2015

B. Das, S. Pal and S. Bag: Neurofractal modeling of weld quality in friction stir welding, International Conference on Cutting, Welding and Surfacing (CWS 2015), 5 -7th August, 2015, Coimbatore. (Best technical paper award)

Int. Conference 2015

M. Baruah and S. Bag: Analysis of plasma micro welded Ti‑6Al‑4V sheets, International Conference on Laser and Plasma Applications in Materials Science (LAPAMS 2015), 15 – 17th January, 2015, Kolkata.

Int. Conference 2014

J. Kalivarapu, S. Jain and S. Bag: Development of self-consistent multi objective harmony search algorithm, The 5th International Conference on Swarm, Evolutionary and Memetic Computing(SEMCCO 2014), 18-20th December, 2014, Bhubaneswar, Odisha. (LNCS 8947, Chapter 48)

Int. Conference 2014

M. Baruah and S. Bag: Experimental and Numerical Investigation of Micro Plasma Welded Ti‑6Al‑4V sheets, International Symposium on Aspects of Mechanical Engineering & Technology for Industry (AMETI 2014), 6 – 8th December, 2014, NERIST, Arunachal Pradesh.

Int. Conference 2014

N. Yadaiah, S. Bag, C. P. Paul and L. M. Kukreja: An experimental investigation on fiber laser welding at controlled inert gas atmosphere, 5th International and 26th All India Manufacturing Technology, Design and Research Conference (AIMTDR), 12th – 14th December, 2014, IIT Guwahati.

Int. Conference 2014

A. K. Mondal, P. Biswas, S. Bag and Manas M Mohapatra: Prediction of weld induced angular distortion of single sided and double sided fillet joint by saw process, 5th International and 26th All India Manufacturing Technology, Design and Research Conference (AIMTDR), 12th – 14th December, 2014, IIT Guwahati.

Int. Conference 2014

D. Yaduwanshi, S. Pal and S. Bag: Effect of Preheating on Mechanical Properties of Hybrid Friction Stir Welded Dissimilar Joint, 5th International and 26th All India Manufacturing Technology, Design and Research Conference (AIMTDR), 12th – 14th December, 2014, IIT Guwahati.

Int. Conference 2014

B. Das, S. Pal and S. Bag: Monitoring of friction stir welding process through signals acquired during the welding, 5th International and 26th All India Manufacturing Technology, Design and Research Conference (AIMTDR), 12th – 14th December, 2014, IIT Guwahati.

Int. Conference 2014

S. Bag: Optimization of penetration depth by pulse shaping in laser microwelding of stainless steel, Advancements in Welding, Cutting & Surfacing Technologies for Improved Economy, Reliability & Sustainable Environment, IIW International Congress 2014, 9th - 11th April, 2014, New Delhi.

Int. Conference 2014

D. Yaduwanshi, S. Pal and S. Bag: Dissimilar hybrid friction stir welding of pure copper and AA1100, Advancements in Welding, Cutting & Surfacing Technologies for Improved Economy, Reliability & Sustainable Environment, IIW International Congress 2014, 9th - 11th April, 2014, New Delhi.

Int. Conference 2014

M. Baruah and S. Bag: Investigation on micro plasma welding of titanium alloy, Advancements in Welding, Cutting & Surfacing Technologies for Improved Economy, Reliability & Sustainable Environment, IIW International Congress 2014, 9th - 11th April, 2014, New Delhi.

Int. Conference 2014

A. Mondal, P. Biswas and S. Bag: Effect of process parameters on microstructure and mechanical properties of single pass single-sided square butt joint by submerged arc welding, Advancements in Welding, Cutting & Surfacing Technologies for Improved Economy, Reliability & Sustainable Environment, IIW International Congress 2014, 9th - 11th April, 2014, New Delhi.

Int. Conference 2014

N. Yadaiah, S. Bag, C. P. Paul and L. M. Kukreja: Efficient Finite Element Modeling of Fiber Laser Welding Process under Conduction Regime on 316 Stainless Steel Plate, International Conference on Advances in Mechanical Sciences (ICAMS2014), 9th -11th January, 2014, Vardhaman College of Engineering, Hyderabad. (awarded one of the best papers)

Int. Conference 2013

S. Bag and P K. Sahu: Influence of pulse shaping in thermal analysis of ultra-shot pulse laser welding using non-Fourier heat conduction, 22nd National and 11th International ISHMT-ASME Heat and Mass Transfer Conference, 28th – 31st December, 2013, IIT Kharagpur, India.

Int. Conference 2013

N. Yadaiah, S. Bag, C. P. Paul and L. M. Kukreja: Fiber laser welding of austenitic stainless steel in protective atmosphere of argon, Recent Development in Welding and Joining Technologies, 7th Asia Pacific IIW International Congress, 8th - 10th July, 2013, Singapore.

Int. Conference 2013

D. Yaduwanshi, S. Bag and S. Pal: Thermal analysis on plasma assisted friction stir welding of aluminum alloy, Recent Development in Welding and Joining Technologies, 7th Asia Pacific IIW International Congress, 8th – 10th July, 2013, Singapore.

Int. Conference 2013

A. Mondal, P. Biswas and S. Bag: Effect of process parameters on residual stress distribution of submerge arc welded butt joint, Recent Development in Welding and Joining Technologies, 7th Asia Pacific IIW International Congress, 8th – 10th July, 2013, Singapore.

Int. Conference 2012

A. Mondal, R. Ranjan, P. Biswas and S. Bag: Finite element analysis of weld induced residual stress of double sided fillet welded joint’, Processing and Fabrication of Advanced Materials XXI, 10th – 13th December, 2012, Guwahati, India.

Int. Conference 2011

S. Bag, D. V. Kiran and A. De: Efficient estimation of volumetric heat source in fusion welding process simulation, 64th IIW Annual Assembly (Commission IX), 17th – 21st July, 2011, Chennai, India.

Int. Conference 2011

S. Bag and N. Yadaiah: Possible role of surface active elements in weld pool modelling of fusion welding process, International Conference on Computational Methods in Manufacturing (ICCMM 2011), 15th -16th December, 2011, IIT Guwahati, India.

Int. Conference 2011

R.E. Loge, S. Bag, K. Huang and M. Bernacki: Modelling dynamic and static recrystallization using mean field and finite element methods, Thermec 2011; 01/2011.

Int. Conference 2011

R.E. Loge, H. Resk, S. Bag, K. Huang and M. Bernacki: Modelling deformation and recrystallization in metals using digital microstructures and mean field methods, KomPlasTech 2011; 01/2011.

Int. Conference 2008

S. Bag and A. De: Three dimensional heat transfer modeling of laser beam welding using adaptive volumetric heat source and GA based optimization of absorption coefficient, International Conference on Welding (IIW IC - 2008), Organized by Indian Institute of Welding (IIW) in association with International Institute of Welding, 8th - 10th January, 2008, Chennai, India. (Awarded H D Govindraj Memorial Research Award for best research paper)

Int. Conference 2006

S. Bag, A. Trivedi and A. De: Reliable estimation of laser weld pool using numerical modeling and multivariate optimization, 1st International and 22nd All India Manufacturing Technology Design and Research Conference, 21st - 23rd December, 2006, IIT Roorkee, India.

Int. Conference 2006

A. Trivedi, S. Bag and A. De: Three dimensional transient heat conduction and thermomechanical analysis for laser spot welding using adaptive heat source, Computer Aided Welding Engineering - 2006, 19th - 21st October, 2006, Shandong University, Jinan, P. R. China.

National Journal 2013

S. Bag: Recent advances in laser microwelding, KIRAN: A Bulletin of Indian Laser Association, 24(2), 23 – 31, 2013.

National Journal 2012

S. Bag: Adverse effect of surface active element transport in conduction mode laser welding process, KIRAN: A Bulletin of Indian Laser Association, 23(2), 6-10, 2012.

National Journal 2009

S. Bag and A. De: Three dimensional heat transfer modeling of laser beam welding using adaptive volumetric heat source and GA based optimization of absorption coefficient, Indian Welding Journal, 42(2), 43-48, 2009.

Nat. Conference 2016

M. Baruah and S. Bag: Influence of gap conductance in thermal analysis of laser transmission welding, Recent Trend in Mechanical Engineering, 21 st – 22 nd October, 2016, Institute of Engineers (India, Assam State Centre), Guwahati.

Nat. Conference 2015

R. Majumdera, M. Baruah and S. Bag: Influence of plasma gas flow rate on weld-induced distortions in plasma microwelding of low carbon steel, 30th National Coference of Production Engineers, Agartala, Tripura July 18-19, 2015.

Nat. Conference 2013

D. Yaduwanshi, S. Pal and S. Bag: Theoritical and experimental development of plasma assisted friction stir welding, National Conference on Manufacturing: Vision for Future (MVF 2013), IIT Guwahati, Assam, 12th - 13th October, 2013.

Nat. Conference 2013

M. Baruah and S. Bag: A perspective on thermal analysis of laser transmission welding, National Conference on Manufacturing: Vision for Future (MVF 2013), IIT Guwahati, Assam, 12th - 13th October, 2013.

Nat. Conference 2013

P. K. Sahu and S. Bag: Finite element modeling of ultra-shot pulsed laser welding using non-Fourier heat conduction, National Conference on Advances in Welding Technology, NERIST, Itanagar, Arunachal Pradesh, 10th - 11th May, 2013.

Nat. Conference 2013

R. S. Desai and S. Bag: Numerical modeling and simulation of micro-laser spot welding, National Conference on Advances in Welding Technology, NERIST, Itanagar, Arunachal Pradesh, 10th - 11th May, 2013.

Nat. Conference 2009

S. Bag and A. De: Development of a transport phenomena based numerical model for GTAW process using FEM, National Welding Seminar (NWS-2009), Organized by The Indian Institute of Welding, Mumbai, 4th - 6th February, 2009.

Nat. Conference 2007

A. De, S. Bag and A. Trivedi: Enhancing reliability of numerical computational model for laser spot welding process, National Conference on Welding Productivity and Quality (WPQ-2007), NMRL Ambernath, India, 20th – 21st February, 2007.

Research Group & Students

PhD Scholars and MTech / BTech project supervisions

NY
Dr. N. Yadaiah (2015) PhD Alumnus
Thesis: Experimental investigation and numerical modeling of deep penetration laser and GTA welding processes
Position: Assistant Professor, Dept of Mechanical Engineering, NERIST, Arunachal Pradesh Expertise: Computational Welding Mechanics, Additive Manufacturing, Laser Based Manufacturing Processes and macro-/micro-scale fusion welding processes
MB
Dr. Mayuri Baruah (2017) PhD Alumnus
Thesis: Experimental investigation and numerical modeling of plasma and laser microwelding processes
Position: Assistant Professor, Dept of Production and Industrial Engineering, NIT Jamshedpur Expertise: Welding, Additive Manufacturing, Numerical Modelling, Fracture Mechanics, Advance Machining, Optimization, Python, Artificial Intelligence
DY
Dr. Deepak Yaduwanshi (2017) PhD Alumnus
Thesis: Plasma assisted hybrid friction stir welding of similar and dissimilar materials
Position: Assistant Professor, Dept of Mechanical Engineering, College of Engineering and Technology, Adigrat University, Ethiopia (Co-Supervisor: Prof. Sukhomay Pal) Expertise: Welding and joining
BD
Dr. Bipul Das (2017) PhD Alumnus
Thesis: Weld quality monitoring and defect identification in friction stir welding process
Position: Assistant Professor, Dept of Mechanical Engineering, NIT Silchar, Assam (Co-Supervisor: Prof. Sukhomay Pal) Expertise: Condition monitoring, Friction stir welding, welding processes, Material Processing, Advanced Manufacturing processes
AK
Dr. Arpan Kumar Mondal (2018) PhD Alumnus
Thesis: Experimental and numerical study of submerged arc welding induced thermal history, residual stresses, distortion and weldment characterization
Position: Assistant Professor, Dept of Mechanical Engineering, NITTTR, Kolkata (Co-Supervisor: Prof. Pankaj Biswas) Expertise: Welding Technology, Fusion welding processes, Submerged arc welding, Computational welding mechanics, Heat transfer in welding, Residual stress and distortion, Application of optimization in manufacturing
BK
Dr. Bikash Kumar (2021) PhD Alumnus
Thesis: Evaluation of residual stress distribution in laser welding process including the effect of phase transformation kinetics
Position: Assistant Professor, Dept of Industrial & Production Engineering, NIT Jalandhar, Punjab Expertise: Welding Technology, Laser welding, Phase transformation, Residual stress, Finite element modeling
AK
Dr. Ajit Kumar Sahu (2021) PhD Alumnus
Thesis: Laser and micro-plasma arc welding of thin sheet Inconel 718 and AISI 316L stainless steel at similar and dissimilar combinations
Position: Assistant Professor (Ad-hoc), Dept of Mechanical Engineering, NIT Rourkela Expertise: Welding Technology, Solidification of superalloys, Advanced welding processes, Similar and dissimilar joining
DD
Dr. Debtanay Das (2024) PhD Alumnus
Thesis: Evaluation of Surface and Sub-Surface Defects in Friction Stir Welding Through Experiments and Coupled Eulerian and Lagrangian Based Finite Element Model
Position: Research Associate, Department of Materials Engineering, IISc Bangalore (Co-Supervisor: Prof. Sukhomay Pal) Expertise: Friction stir welding, Defect assessment, material characterization, Machine learning algorithms, Micro FSW (IIW Best PhD Thesis Award 2024)
SD
Swagat Dwibedi Thesis Submitted
Area/Topic: Fusion welding processes, Welding metallurgy, FEM based numerical analysis, Failure analysis, NDT
AK
Avadh Kishore Prasad Thesis Submitted
Area/Topic: Additive Manufacturing, Induction based heating, Finite element modeling
Email: avadh_kishore@iitg.ac.in | Co-Supervisor: Dr. Sajan Kapil
AK
Amritesh Kumar Ongoing
Area/Topic: Wire arc additive manufacturing, Finite element modeling of additive manufacturing processes, Machine learning and Artificial intelligence
HA
Hritaban Acharya Ongoing
Area/Topic: Metal additive manufacturing, Metallurgy of MAM, Fatigue properties of MAM (AlSi10Mg, Ti6Al4V)
Email: h.acharya@iitg.ac.in | Co-Supervisor: Dr. P. Khanikar
UM
Umesh Melkani Ongoing
Area/Topic: Wire arc additive manufacturing, Functionally graded material, Finite element modeling of additive manufacturing processes
Email: m.umesh@iitg.ac.in | Co-Supervisor: Dr. Sajan Kapil
AK
Akshay Kumar Soni Ongoing
Area/Topic: Twin roll casting, Finite element modelling, Phase field modelling
Email: kakshayakshay_kumar@iitg.ac.in | Co-Supervisor: Prof. P S Robi
AK
Anil Kumar Sah Ongoing
Area/Topic: Plasma based additive manufacturing, Finite element modelling
VM
Vipin Mishra Ongoing
Area/Topic: Resistance spot welding, Electrode life prediction, Liquid metal embrittlement severity in RSW
AC
Ashimjyoti Chutia Ongoing
Area/Topic: Induction based additive manufacturing, Mechanism of droplet transport
GS
Gaurav Shikhar Das Ongoing
Area/Topic: Multi material deposition
Email: gaurav.das@iitg.ac.in | Co-Supervisor: Prof. Pankaj Tiwari
RP
Rounak Pal Ongoing
Area/Topic: Welding and joining
Email: p.rounak@iitg.ac.in | Co-Supervisor: Prof. Sukhomay Pal
SS
Satyam Singh M.Tech Grad (2021)

Project: Developing parameter window for SLM based additive manufacturing using machine learning

NS
Neeraj Singh Yadav M.Tech Grad (2021)

Project: Micro plasma arc welding of Zinc coated steel sheet

SJ
Saksham Jhangir M.Tech Grad (2020)

Project: Experimental investigation and numerical model of FSW using coupled Eulerian Lagrangian (CEL) approach

BK
Baibhav Kumar M.Tech Grad (2020)

Project: Experimental analysis of CO2 laser welding of Inconel 718 and AISI 316L

BC
Bhupendra Chandra M.Tech Grad (2020)

Project: Experimental and numerical investigation of CO2 laser welded similar and dissimilar joint

AS
Ayushman Singh Bhadouriya M.Tech Grad (2020)

Project: Effect of arc offset on dissimilarSS304/T2 copper joining by gas tungsten arc welding process

SK
Sumit Kushwaha M.Tech Grad (2019)

Project: Influence of pulse shaping in laser welding process

KK
Kanhai Kumar Das M.Tech Grad (2019)

Project: Experimental investigation on high frequency induction welding of mild steel

AK
Avneesh Kumar M.Tech Grad (2019)

Project: Experimental investigation on friction stir welding of aluminium alloy

RN
Rachit Nawani M.Tech Grad (2018)

Project: Thermomechanical analysis of laser welding between titanium alloy and stainless steel

TS
T Sachdeva M.Tech Grad (2017)

Project: Development of numerical model for thermo-mechanical analysis of FSW process

SK
S K Kushwaha M.Tech Grad (2017)

Project: Keyhole formation in deep penetration laser welding process

DK
Daniel Kebede M.Tech Grad (2017)

Project: Thermomechanical analysis of laser welded titanium alloy

AT
Ang Tashi Sherpa M.Tech Grad (2017)

Project: Heat transfer analysis for ultra short pulse laser heating

TS
Tinku Saikia M.Tech Grad (2016)

Project: Thermo-mechanical analysis in micro plasma arc welding of thin sheet maraging steel

SK
S. Kumar M.Tech Grad (2015)

Project: Finite element modelling of heat transfer in ultra short pulse laser heating using non-Fourier heat conduction

VP
V. P. Singh M.Tech Grad (2015)

Project: Analytical model of energy distribution in friction stir welding process

KS
K. Shankhwar M.Tech Grad (2015)

Project: Analysis of temperature and thermal stresses in ultra-shot pulsed laser heating

RY
R. Yadav M.Tech Grad (2014)

Project: Design and development of three dimensional force measurement set-up for friction stir welding

PK
P. K. Sahu M.Tech Grad (2013)

Project: Finite element modeling of ultra-shot pulse laser welding using non-Fourier heat conduction

RS
R. S. Desai M.Tech Grad (2013)

Project: Finite element based thermo-mechanical modeling of micro-laser spot welding process

SS
S. Singh M.Tech Grad (2012)

Project: Distortion and residual stress analysis in fusion welding process using finite element method

AV
A. Vishnu and A. C. Ibrahim B.Tech Grad (2019)

Project: Multi-objective optimization of welding parameters in submerged arc welding using Harmonic Search

GS
G. S. Jodha and V. Jyani B.Tech Grad (2018)

Project: Optimization in manufacturing process using harmony search algorithm

SV
S. Vanam and V. D. Kute B.Tech Grad (2018)

Project: Investigation on recrystallization phenomena in friction stir welding process

AR
A. Ranjan and G. Kumar B.Tech Grad (2017)

Project: Investigation on multilayer deposition in gas metal arc welding process

AK
A. Kalita and D. K. Lodhi B.Tech Grad (2017)

Project: Joining of dissimilar steels

AS
A. Sao and A. Sen B.Tech Grad (2016)

Project: Multiobjective optimization using Harmony Search Algorithm

AN
A. Nikhil B.Tech Grad (2015)

Project: Mechanical and microstructural analysis of micro plasma welded titanium alloy

DS
D. S. Reddy and R. Manjunadh B.Tech Grad (2015)

Project: Development of a portable setup for micro-friction stir welding

SJ
S. Jain and J. Kalivarapu B.Tech Grad (2014)

Project: Development of self-consistent harmony search algorithm for optimization in manufacturing process

JS
J. Singh and Jitender B.Tech Grad (2014)

Project: Prediction of missed joint behavior by thermoelectric magnetic field in electron beam welding of dissimilar materials

VS
V. S. Goutham and V. Sandeep B.Tech Grad (2014)

Project: Theoretical investigation and mathematical modeling of dynamic recrystallization

Awards & Honors

Academic and professional distinctions

Academic Distinction & Editorials

2024

Editorial Board member of Science and Technology of Welding and Joining (SAGE Journals) and China Welding, 2025

2025

Associate Editor of Welding International, Taylor & Francis

2023

Awarded best presenter for the track of Manufacturing Technology in International Conference on Advances in Materials & Processing Technologies (AMPT), 13-16 September, University Putra Malaysia, Malaysia

Award

Contribution on the contextual changes for Indian students for well-known book - Introduction to Materials Science for Engineers authored by James F. Shackelford, Pearson publisher (worked on two editions)

2009

Recipient of ‘ Royal Arc Award – ’ from Indian Institute of Welding for the best PhD thesis in welding

2008

Co-recipient of H. D. Govindraj Memorial Research Award for the best research paper presented in International Welding Congress held at Chennai, India on 8-10 th January

1993

Merit Scholarship from Government of West Bengal, India

Journal Best Papers & Highlights

2025

Editor’s choice “Comparison of machine learning performance for the prediction of melting efficiency and bead geometry in wire arc additive manufacturing process” of Archives of Metallurgy and Materials journal published in quarterly issue 1/2025

2024

Awarded best paper “Critical assessment on the influence of process parameters in micro-plasma arc welding process: a review” of Welding International journal by the editor for the year

2023

Awarded best paper “Evaluation of liquid metal embrittlement-free weld by micro-plasma arc welding of Zn-coated interstitial free steel” of Welding International journal by the editor for the year

2014

N. Yadaiah and S. Bag: Development of egg-configuration heat source model in numerical simulation of autogenous fusion welding process, International Journal of Thermal Sciences, Vol. 86, pp. 125-138. ( Science Direct top 25 list of most downloaded articles ( Rank 8 th for July-September and 19 th for October-December )

Supervised Student Awards

2024

Best PhD student thesis (Dr. Debtanay Das) from Mechanical Engineering Department, IIT Guwahati

2024

Best PhD student thesis (Dr. Debtanay Das) form Indian Institute of Welding (IIW)

2023

3rd prize for best departmental poster presentation (student: Dr. Debtanay Das) for the poster titled, "CEL based physics-informed ML algorithms to predict thermo-mechanical responses of dissimilar FSW” Poster presentation during Research and Industrial Conclave (RIC-2023), IIT Guwahati, May 14-16

2023

Poster titled “Deposition Rate Improvement in GMAW-Based Wire Arc Additive Manufacturing” secured the 2nd runner-up position at the AM Aero 3D conference organized by ASME held at Ramaiah Institute of Technology, Bangalore on December 13 and 14

2021

Corps of Electrical and Mechanical Engineers’ Prize (student: Mr. Swagat Dwibedi ) for the paper titled "Development of Micro-plasma Arc Welding System for Different Thickness Dissimilar Austenitic Stainless Steels" published in the Journal of The Institution of Engineers (India): Series C, Issue 3, Volume 102 under Production Engineering Division Board (PRDB), The Institution of Engineers (IEI) (India) (16 th Dec 2022)

2021

Best paper award (student: Mr. Swagat Dwibedi ) during the 12 th International Conference on Materials Processing and Characterization (12 th ICMPC) conference held at National Institute of Technical Teachers' Training and Research (NITTTR), Chandigarh, from 6 th -9 th October. 1

2017

B est poster award (student: Dr. Bipul Das) in Research Conclave, Organized by Student Academic Board, Indian Institute of Technology Guwahati

2015

Best technical paper award (student: Dr. Bipul Das) for the paper presented in 2nd International Conference on Advances in Cutting, Welding and Surfacing (CWS), 05-07 August, Coimbatore, India

2014

N. Yadaiah, S. Bag, C. P. Paul and L. M. Kukreja: Efficient Finite Element Modeling of Fiber Laser Welding Process under Conduction Regime on 316 Stainless Steel Plate, International Conference on Advances in Mechanical Sciences, Hyderabad, India, from 9th to 11th January, pp. 24-31. (Awarded the best research paper presented from International Conference on Advances in Mechanical Sciences)

Students' Corner

A Message from Prof. Swarup Bag

Prof. Swarup Bag

Prof. Swarup Bag

Professor, Dept. of Mechanical Engineering & Chairman, Technical Board, IIT Guwahati

Dear Students,

Welcome to the Students' Corner. Mechanical Engineering is not just about machines; it is the cornerstone of modern technology, driving innovations from microjoining to large-scale additive manufacturing. At IIT Guwahati, we strive to merge foundational physics with computational power. In our research group, we focus on cutting-edge areas like fusion welding, wire arc additive manufacturing, and advanced finite element modeling (FEM) to solve real-world industrial challenges.

As the Chairman of the Technical Board of IIT Guwahati, I want to encourage you to look beyond the classroom. The Technical Board is a vibrant platform where your academic knowledge meets creative execution. Whether you are participating in robotics, aeromodelling, or coding, these hands-on technical activities shape you into a problem-solver.

Embrace curiosity, cultivate a scientific temper, and don't be afraid to experiment. Engineering is about failing forward, refining models, and discovering new material behaviors. Utilize the state-of-the-art facilities at our Central Workshop and Advanced Welding Lab, collaborate with your peers, and let your passion drive your research. I wish you all the very best in your academic and creative journeys!

Warm regards,
Prof. Swarup Bag