| 摘要 |
PURPOSE:To easily obtain a weld zone which is free from defects by subjecting the lap weld zone to spot welding at a specified pitch (l) prior to lap welding of upper metallic foil of a specific thickness on a heat input side on lower metallic foil. CONSTITUTION:The metallic foil of <=0.3mm thickness which is the upper metallic foil is lap welded on the lower metallic foil. The lap weld zone is previously subjected to the spot welding at such a pitch (l) at which the ratio of the thickness (t) of the upper metallic foil and the pitch (l) of the spot welding attains 2<=l/t<=200. The lap welding of the metallic foil is easily executed without defects in this way. |
