Friction stir welding apparatus

摘要

Device (1) comprises: a rotatably driven pin (3) about a rotational axis (9) exhibiting a drive end (11) and a free end; a first shoulder element (5) concentrically arranged on the drive end facing side of the engaging portion relative to the rotational axis around the pin and exhibits a first abutment surface extending perpendicular to the rotational axis oriented for engaging portion; and a second shoulder element concentrically arranged on the free end facing side of the engaging portion relative to the rotational axis around the pin. Device (1) for friction stir welding comprises: a rotatably driven pin (3) about a rotational axis (9) exhibiting a drive end (11) and a free end, where a cylindrical engaging portion is provided between the drive end and the free end which extends axially in direction of the rotational axis, and a circumferential surface is provided for engaging with at least one workpiece; a first shoulder element (5) which is concentrically arranged on the drive end facing side of the engaging portion relative to the rotational axis around the pin and exhibits a first abutment surface extending perpendicular to the rotational axis oriented for engaging portion; and a second shoulder element which is concentrically arranged on the free end facing side of the engaging portion relative to the rotational axis around the pin and exhibits a second abutment surface extending perpendicular to the rotational axis oriented for engaging portion. The second abutment surface extends directly up to the engaging portion, and the first shoulder element is provided for engaging the first surface and the second shoulder element is provided for engaging the second surface, where the first opposite surface is provided on at least one workpiece. The second shoulder element is rotatably connected with the pin freely about the rotational axis.