74) Which type welding uses a non - ferrous filler with melting point above 450 Degree, than base metal?

75) Which welding process enables to weld dissimilar metals?

76) What type of gas flame is used to weld 2mm mild steel by brazing method?

77) Which system of welding is free from 'Arc blow'?

78) What is the effect of expansion and contraction due to heat in welding?