MT602

WELDING METALLURGY

OBJECTIVE :

To study the principles of welding metallurgy of ferrous and non-ferrous materials .

1 THERMAL CYCLES

Heat flow - temperature distribution-cooling rates - influence of heat input, joint geometry, plate thickness, preheat, significance of thermal severity number.

2 SOLIDIFICATION

Epitaxial growth - weld metal solidification - columnar structures and growth morphology- effect of welding parameters - absorption of gases - gas/metal and slag/metal reactions.

3 WELDING METALLURGY OF FERROUS MATERIALS

Phase transformations- weld CCT diagrams - carbon equivalent-preheating and post heating- weldability of low alloy steels, welding monograms; welding of stainless steels (austenitic, ferritic, martensity, duplex and PH stainless steels), use of Schaffler and Delong diagrams, welding of cast irons – microstructures, defects and remedial measures.

4 WELDING METALLURGY NON FERROUS MATERIALS

Welding of Cu, Al, Ti and Ni alloys – processes, difficulties, microstructures, defects and remedial measures.

5 WELD DEFECTS AND WELDABILITY TESTS

Origin - types - process induced defects, - significance - remedial measures, Hot cracking - cold cracking -lamellar tearing - reheat cracking - weldability tests - effect of metallurgical parameters.

TEXT BOOKS :

  1. Linnert G. E.,‘Welding Metallurgy’, Volume I and II, 4th Edition, AWS, 1994
  2. Granjon H., ‘Fundamentals of Welding Metallurgy’, Jaico Publishing House, 1994
  3. Kenneth Easterling, ‘Introduction to Physical Metallurgy of Welding’, 2nd Edition, Butterworth Heinmann, 1992
  4. Saferian D., ‘The Metallurgy of Welding’, Chapman and Hall, 1985
  5. Jackson M. D., ‘Welding Methods and Metallurgy’, Grffin, London, 1967

REFERENCES :

  1. Norman Bailey, ‘Weldability of Ferritic Steels’, Jaico Publishing House, 1997
  2. Kou S., ‘Welding Metallurgy’, John Wiley, 1987