| 摘要 |
PURPOSE: A welding device is provided to simplify a structure, reduce a manufacturing cost, and perform a multipoint welding stably and highly precisely. CONSTITUTION: A welding device is provided with a lower electrode part(5), an upper electrode part(6) and a cooling water circulation flow passage(14) for circulatively supplying cooling water to a welding electrode pressing cylinder gun(13) of the upper electrode part(6). Also, a check valve(15) is arranged on the upstream side than the cylinder gun(13) in the cooling water circulation flow passage(14). Further, a booster(16) is arranged on the downstream side than the cylinder gun(13) in the cooling water circulation flow passage(14), and by pressuring the cooling water in the flow passage(14) to the check valve(15) via the cylinder gun(13) from the booster(16), the cylinder gun(13) is extended and welding is performed.
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