| 摘要 |
PROBLEM TO BE SOLVED: To prevent welding defects in a welding start edge portion and a welding finish edge portion. SOLUTION: In the mash seam welding method to carry out seam welding by pinching a joint portion formed by lapping a little together metal plates between seam electrodes to mesh up to approximately the same plate thickness as that of then other base material, while the apparatus runs performing seam welding from welding start edge point t welding finish edge point, the rotational speed of the seam electrode is detected in real time, the rotational speed of the electrode detected is compared with the rotational speed corresponding to the predetermined optimal welding current value, and thereby the welding current value is changed continuously or step-by-step corresponding to the rotational speed of the electrode from welding start edge point to welding finish edge point.
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