Introduction. Part 1 General issues: The friction stir welding process: An overview Material deformation and joint formation in friction stir welding Friction stir welding equipment Industrial applications of friction stir welding The future of friction stir welding Inspection and quality control in friction stir welding. Part 2 Variables in friction stir welding: Residual stresses in friction stir welding Effects and defects of friction stir welds Modeling thermal properties in friction stir welding Metallurgy and weld performance in friction stir welding.