| 摘要 |
PURPOSE:To elevate the work efficiency, by providing a notch on the upper plate, exposing the edge of an intermediate plate, and executing easily circular welding of each plate, in case of lap welding of 3 plates. CONSTITUTION:When 3 plates consisting of an upper plate, an intermedate plate and a lower plate are lapped and welded, as for the third plate 3, circular welding (a weld part 5) can be performed against the first plate 1 by utilizing its notch part 4. Also, as to the second plate 2, too, circular welding (a weld part 6) can be performed, and as for the second plate 2, since its end edge part is exposed in the notch part 4, it can be welded (a weld part 7) to the first plate 1 without lifting up the third plate 3. In this regard, the end edge part of the second plate 2 and the notch part 4 of the third plate 3 are lap-welded. |
