| 摘要 |
PURPOSE:To stabilize welding by placing a plate end so as to decrease gradually a gap of opposed plate ends, and also arc-welding the plate end face by a downward method. CONSTITUTION:Many ribs 1 are formed by bending a thin metallic plate 11 at a prescribed interval, and subsequently, an end part 3 is squeezed and formed by a clamping die, and also a flow path 22 by inserting a core die 24 into the inside. In this case, a triangular air-gap 32 converged gradually toward the lower part from an end part 6 is formed on an end face 31 of the rib 1. Also, a welding torch 7 is moved so that the tip of a wire 5 comes to the tip 6 of the rib 1, and an arc welding is started. The torch 7 is held at that position until an arc is stabilized, and thereafter, it is advanced downward and welding of the end face 31 is executed. The rib 1 is advanced by one crest each and welding is executed successively. In this way, a stable welding is executed to the thin metallic plate 11 by a surface tension of a solidified part, an operation of gravity, etc. |
