| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding apparatus which has an excellent effect in preventing an object to be welded from shifting its position, when a projection welding or a spot welding is performed on a cylindrical object such as a nut. SOLUTION: A spot facing hole 7, which internally fixes a nut N and can apply pressure thereon, is formed on an end face of a movable electrode 4. A judging means for judging if the nut N is internally fixed in the spot facing hole 7 is provided. When the nut N is judged to be internally fixed in the spot facing hole 7 by the judging means, the electrode is activated and performs welding. COPYRIGHT: (C)2007,JPO&INPIT
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