a$).$ i$)$ What do you understand by term resistance welding

ii$)$ Define the term welding electrode, give and explain the different types of electrodes used in welding

i$)$ List three functions of flux coatings on the welding electrodes

ii$)$ Compare upset butt welding and flash but welding

b$)$ List four methods of welding and discuss one of them in details

c$)$ Define the following terms as used in welding

i$)$ skin effect ii$)$ permeability iii$)$ permittivity iv$)$ electrolysis

v$)$ Similar and dissimilar metals vi$)$ Ferrous and nonferrous metals