Introduction -- Fundamentals of the Friction Stir Process -- Fundamental Physical Metallurgy Background for FSW/P -- Friction Stir Welding Configurations and Tool Selection -- FSW of Aluminum Alloys -- Friction Stir Welding of Magnesium Alloys -- Friction Stir Welding of High Temperature Alloys -- Dissimilar Metal Friction Stir Welding -- Friction Stir Processing -- Residual Stresses and Mitigation Strategies.