| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for controlling timing for starting welding so as to make superior welding possible after a joining tool is thrusted in a friction stir welding method. SOLUTION: This is a friction stir welding method by pressurizing a joining tool with a constant pressing force. The method and the apparatus are characterized in that the moving speed in the axial direction of the joining tool is detected by a detector and that, when the point of time is detected at which the shoulder face of the joining tool body is abutted on the surface of a member to be welded, with the moving speed in the axial direction of the joining tool essentially becoming zero, the moving in the axial direction is controlled to stop so that the joining working is started. COPYRIGHT: (C)2007,JPO&INPIT
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