Joining Technologies For Metals

By Prof. D K Dwivedi   |   IIT Roorkee
Learners enrolled: 1422   |  Exam registration: 647
It is proposed to include following joining technologies of commercial importance under different groups of processes.

A) Fundamentals of Metal Joining Technologies: mechanisms for obtaining metallic continuity: fusion, deformation, diffusion, chemical interactions
B) Fusion based processes: principle of fusion welding processes, oxy-fuel has welding, common arc welding processes, high energy beam welding processes, resistance welding processes, newer variants of fusion welding processes
C) Solid-liquid joining processes: brazing and soldering, braze welding, cold metal transfer welding,
D) Solid state joining processes: friction welding and its variants, diffusion bonding, ultrasonic welding and explosive welding and
E) Adhesive joining: design, procedure, and applications
F) Metallurgical Aspects of Welding: weld thermal cycle, solidification of weld metal
G) Weldability of carbon steel, alloys steel, stainless steels; Fe-C, TTT, CCT and schaffler diagram for understanding the metallurgical transformation in weld and heat affected zone., basics of residual stresses H) Common issues related with joining technologies their causes and remedies: hardening and softening of heat affected zone, porosity, cracking,  

INTENDED AUDIENCE: It is a core course for UG/PG students, practicing engineers.
Course Status : Completed
Course Type : Core
Duration : 12 weeks
Category :
  • Mechanical Engineering
  • Materials Joining
Credit Points : 3
Level : Undergraduate/Postgraduate
Start Date : 24 Jul 2023
End Date : 13 Oct 2023
Enrollment Ends : 07 Aug 2023
Exam Registration Ends : 18 Aug 2023
Exam Date : 29 Oct 2023 IST

Note: This exam date is subjected to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1: Fundamentals of Metal Joining Technologies

Week 2: Fusion Welding Process: Principle of fusion welding processes, oxy-fuel has welding, SMAW and GTAW

Week 3: Newer variants of GTAW processes, physics of arc welding, GMAW, SAW, LBW, ESW-EGW

Week 4: Solid-Liquid Joining Processes: brazing and soldering, braze welding, resistance welding

Week 5: Adhesive joining, weld-bonding, solid state joining fundamentals : diffusion bonding, ultrasonic welding

Week 6: Explosive welding, magnetic pulse welding, weld thermal cycle, HAZ,

Week 7: Solidification of weld, metallurgical transformation in weld and heat affected zone, residual stresses, cold cracking, solidification cracking

Week 8: Weldability of metal, metal properties and weldability, hardenability and weldability  

Week 9: Weldability of precipitation hardened, work hardened , transformation hardened

Week 10: Weldability of carbon, alloy steel low carbon and mild steel

Week 11: Weldability of medium carbon, and high carbon alloy steel, heat treatable alloy alloy and Cr-Mo steel

Week 12: Weldability of pre-coated steel and stainless steel

Books and references

  1. Metals Handbook-Welding, Brazing and Soldering, American Society for Metals, 1993, 10th edition, Volume 6, USA.
  2. Richard Little, Welding and Welding Technology, McGraw Hill, 2001, 1st edition.
  3. H Cary, Welding Technology, Prentice Hall, 1988, 2nd edition.
  4. S V Nadkarni, Modern Arc Welding Technology, Ador Welding Limited, 2010, New Delhi.
  5. R S Parmar, Welding process and technology, Khanna Publisher, New Delhi
  6. Welding handbook, American Welding Society, 1987, 8th edition, volume 1 & 2, USA

Instructor bio

Prof. D K Dwivedi

IIT Roorkee
Prof. D K Dwivedi obtained BE (mechanical engineering) , in 1993 from GEC Rewa, ME (welding engineering) Univ. of Roorkee in 1997 and PhD in Met. Engineering from MNIT, Jaipur in 2003. He has about 9 years teaching experience at NIT Hamirpur and 19 years at IIT Roorkee of subjects related with manufacturing at UG level and welding engineering related subjects at PG level. He has published more than 132 research papers in SCI/SCIE indexed journals and undertaken 24 sponsored research and 54 industrial consultancy projects. Instructor has authored five books entitled “Production and Properties of Cast Al-Si Alloys with New Age International, New Delhi (2013), Surface Engineering, Springer Nature (2018), Fundamentals of Metal Joining, Springer Nature (2021), Materials Engineering, AICTE (2022), Dissimilar metal joining, Springer Nature (2023)

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 
29 October 2023 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Roorkee.It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

MHRD logo Swayam logo


Goto google play store