| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability of a press formed article by preventing waterdrops from being intruded from an edge opening generated in the mush- seam weld zone, and preventing sticking of foreign matters and generation of rust in an early time, etc. SOLUTION: In a mush-seam welding method in which a lamp margin obtained by lapping slightly metallic plates is interposed between seam electrodes, a pressure force and a welding current required for the welding are supplied between the above electrodes and the seam welding is performed while crushing continuously the whole length of a weld zone up to a plate thickness almost equivalent to at least the plate thickness of a base material on the one side by applying rotary drives to the electrodes, a part before the welding, which opens toward the end faces of both base materials from the nugget generation position of the seam weld zone, is machined or ground by a cutting tool for machining or a grinder toward the longitudinal direction of the seam weld zone. Consequently, a destroying condition of the weld zone is eliminated.
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