| 摘要 |
PROBLEM TO BE SOLVED: To shorten a cycle time which is required for welding without deteriorating the quality of a joining part in the lap welding of metal plates. SOLUTION: When welding the metal plates to each other after lapping the tail end of one metal plate over the tip of the other metal plate, by moving welding electrodes along their areas, by which the lapped area is interposed and pressured, welding is performed by starting the movements of the welding electrodes and at the same time starting energizing to the welding electrodes, and the energization is stopped as soon as the welding electrodes have completely passed through the lapped area of the metal plates.
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