The latest fundamental and application developments in the field offriction stir welding and processing are presented in these papers.Fundamental issues in the area of microstructure, properties, fracture and fatigue, and corrosion of friction stir welded andprocessed aluminum, titanium, magnesium, and nickel alloys areexamined in this volume. From the 2005 TMS Annual Meet The latest fundamental and application developments in the field offriction stir welding and processing are presented in these papers.Fundamental issues in the area of microstructure, properties, fracture and fatigue, and corrosion of friction stir welded andprocessed aluminum, titanium, magnesium, and nickel alloys areexamined in this volume. From the 2005 TMS Annual Meeting held in San Francisco, California, February 13 - 17, 2005.