Make a distinction between porosity and blow holes?
Illustrate the causes for formation of porosity in welds?
What are the situations required for the phase change in structures due to welding?
Illustrate the mechanism for the formation of heat affect zone in welds?
What are the constituents employed to coat on bare electrodes? Illustrate each of the ingredients?
Make a distinction between AC welding and DC welding?
Austenitic Stainless Steels are successfully welded through spot welding. Comment on this line.