Complete 7 pages APA formatted article: Materials and Process: Welding. Welding is done by making use of fusion techniques in which one metal is fused into the other to give the essence of being essentially a single element whereas non-fusion processes do not make use of welding techniques and are carried out without making use of filler material as in case of soldering and brazing. &nbsp.Solid-phase welding is the type of fusion process that essentially makes use of welding techniques without incorporating heat, for example, friction welding. Poor welds result in early failure of mechanical structures and can result in such serious consequences.