Abstract
Materials commonly used for Friction Stir Welding (FSW) tools are divided into two groups: (1) to weld low melting temperature alloys, such as Al, Mg, and Cu alloys; and (2) to weld high melting temperature alloys, such as steels, Ni, Ti, and Zr alloys. Tool steels are commonly used to join low melting alloys. On the other hand, the processing temperature, stresses, and wear conditions as…