Friction stir welding apparatus includes first inner segment surrounding a pin and having first friction surface segment surrounding the first inner segment and rotationally driven independently of the first inner segment

摘要

A friction stir welding apparatus comprises a pin (3) and first friction surface segment, rotationally driven about an axis of rotation; and a first inner segment (7) having a first inner friction surface (8) for bearing against the workpiece (2, 2'). The first friction surface segment (4) has a first friction surface for resting on the workpiece. The first inner segment surrounds the pin, the first friction surface segment surrounds the first inner segment, and the first friction surface (5)segment is rotationally driven independently of the first inner segment.