Friction stir spot welding of A6063S-T5 with composite coated films

A6063S-T5 is a material that frequently used in construction materials, and many cases, the surface of coated with composite films for durability design purposes．However, if interfered as foreign substance joint while still coated, it may easily have an adverse effect on strength． Therefore, usually necessary to remove before joining or coat part after joining．In this paper, process friction stir spot welding clarified, efficient method materials proposed．It was shown could be removed by using triangular prism-shaped tool, bonding area strength controlled．