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Course Detail

Course Name Advanced Welding Technology
Course Code 15MEC265
Program B. Tech. in Mechanical Engineering
Year Taught 2019


Unit 1

Overview of welding processes and their classification, types of joints, edge preparation, weld symbols, weld nomenclature, bead geometry, power density, heat sources – Gaussian distribution of heat flux, welding techniques – linear and orbital. Arc characteristics. Voltage-current characteristics. Types of welding manipulators and their applications.

Advanced welding processes: submerged arc, TIG, MIG, electro-slag, ultrasonic, electron beam and laser beam welding. Case studies and applications – industrial, automotive and aerospace.

Unit 2

Thermal modeling and simulation of welding processes – governing heat transfer equations and boundary conditions for various types of welding processes. Estimation of cooling rates. Prediction of mechanical properties, micro/macrostructures of weldments and heat-affected zone. Prediction of weld defects such a crack, segregation, lack of fusion. Modeling and simulation of pulsed arc processes. Use of softwares for simulation.

Solidification behaviour of fusion weld: structural zones, epitaxial growth, weld pool shape and columnar grain structures. Weldability of metals – steels, stainless steels, aluminium, copper, nickel and titanium alloys.

Unit 3

Microstructures of weldment. Segregation of alloying elements. Impact of micro/ macro-structures and segregation on mechanical properties. Pre – and post-treatment. Effects of heat flow on residual stresses and distortion. Weldability tests.

Welding defects – causes and remedies. Methods of testing weldments – mechanical, pressure and leak testing. Inspection methods – visual, penetrant, magnetic, ultrasonic, x-ray and gamma radiography. Use of imaging techniques for online monitoring.

Text Books

  1. Khanna O. P. – ‘A Text Book on Welding Technology’ – Dhanpat Rai and Sons, New Delhi – 2013
  2. Parmar R. S. – ‘Welding Process and Technology’ – Khanna Publishers, Delhi – 1992


  • Little R. L. – ‘Welding and Welding Technology’ – Tata McGraw Hill Publishing Company Limited, New Delhi – 1989
  • Grong O. – ‘Metallurgical Modelling of Welding’ – The Institute of Materials – 1997 – 2nd Edition
  • Kou S. – ‘Welding Metallurgy’ – John Wiley Publications, New York – 2003 – 2nd Edition.

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