Patent ID: 7036708
Filing Date: 2006-05-02
Classification: B23K,F04B,Y10T

Abstract:
1. A method of manufacturing a piston for a swash plate type compressor with variable capacity, said method being performed on a first piston member having a bridge and a first coupling part extending from the bridge and a second piston member having a second coupling part adapted to be coupled with the first coupling part and a hollow part, said method comprising the following steps that are performed in the recited sequence: rotatably supporting the first and second piston members on first and second supporting parts while the first and second piston members are coupled together; friction stir welding the first and second piston members together while rotating the first supporting part at a predetermined speed after a welder is rotatably advanced downwardly and inserted into welded portions of the first and second piston members; moving the welder from the welded portions to a predetermined position while maintaining contact between the welder and the first piston member after finishing the fiction stir welding; and separating the welder from the first piston member at said predetermined position.