23. Lis any three defects associated with fusion welding, and
describe them briefly.
24. Draw a sketch of weld section, and label three zones; namely:
base metal, weld metal and heat affected zone.
25. Define power density and include its units, and describe how
power density affects size of heat affected zone?
26. Sketch Fe-Fe3C equilibrium phase diagram, and identify the
following:
a. Alpha region
b. Gamma region
c. Delta region
d. Eutectic point
e. Eutectoid point
f. Lower critical...