ABSTRACT
This chapter presents the essence of process of Friction Stir Welding (FSW) in entirety. It deals with overview on solid state joining and explains character of FSW as solid state welding process, thus distinguishes special characteristics of FSW vis-à-vis other solid state joining processes. Solid state welding works on principle of interatomic bonding obtained in solid state. Work fixturing and tool-to-machine interface is explained and FSW process parameters are elaborated in terms of their effect on response and guideline for their selection. FSW process is welding process in which the term friction refers to utilization of frictional heat required for softening the base material (BM) and term stir signifies the movement of the material in the form of plastic deformation. FSW technique was initially invented for welding of high-strength aluminum alloys, but its success made way for its phenomenal growth and it emerged as major process for joining magnesium, copper and their alloys, ferrous, and other nonferrous alloys.
