Patent ID: 6953140
Filing Date: 2005-10-11
Classification: B23K,F04B

Abstract:
1. A friction stir welding apparatus of a piston for a swash plate type compressor with variable capacity, the friction stir welding apparatus comprising: first and second supporting parts mounted on the top surface of a table, the first and second supporting parts rotatably supporting a first piston member and a second piston member, the first piston member having a bridge and a first coupling part protruding from the bridge, the second piston member having a second coupling part coupled with the first coupling part of the first piston member and a hollow part coupled with the first piston member; a welder rotatably insertable into welding portions of the first and second piston members supported by the first and second supporting parts, the welder being arranged for carrying out friction stir welding along the rotation direction of the first and second piston members; support rollers elastically mounted on the lower side of the first and second piston members for causing central axis lines of the first and second piston members to be on central axis lines of the first and second supporting parts while the first and second piston members are supported on the first and second supporting parts, the support rollers being arranged for vertical movement within a predetermined height range while supporting the first and second piston members; and a structure for transferring the welder from the welded portions to a bridge portion of the first piston member after the friction stir welding of the welding portions by the welder.