Friction stir welding (FSW) and its variants, friction stir spot welding and friction stir processing, are used in numerous industrial applications and there is considerable activity in the development of FSW processes and their applications. This volume covers the seventh proceedings in this recurring TMS symposium, focusing on all aspects of the science and technology involved in friction stir welding and processing. An important reference for materials scientists and engineers, metallurgists, and mechanical engineers in such areas as shipbuilding, aerospace, automotive, and railway rolling stock.