| 摘要 |
PURPOSE:To obviate generation of a welding defect with a method for providing a projection to one of galvanized steel sheets and welding said sheets by providing a specific hollow groove to the other galvanized sheet. CONSTITUTION:A projecting part 3 is formed to a steel sheet 1 in the case of welding the steel sheets 1, 2 which are galvanized 1a, 2a on one side. A doughnut-shaped circular groove 4 having the diameter larger than the diameter of the part 3 is provided to the sheet 2. The central parts of the part 3 and the groove 4 are matched and the sheets are welded. Then the part 3 is welded and a nugget 5 is gradually formed and flows into the groove 4. As a result, the welding current is uniformly conducted at the diameter range corresponding approximately to the size of the nugget, by which the welding conforming to the specification is accomplished without change in the current density. |
