| 摘要 |
PURPOSE:To eliminate defects that occur when the width of weaving is large by making welding of plural passes of proper number for each layer using straight welding and weaving welding or weaving welding of the second layer and after. CONSTITUTION:A round of welding is taken performing straight welding for the first layer A of the bottom. Multipass welding is made for the second layer and after. However, for the second layer, both sides B, C are straight welded successively. For the third layer and after, sides, D, G, J, M on the nozzle 2 side are straight welded first, and sides E, H, K, N of base tube 1 side are welded by minute weaving keeping the height of the welding torch at that time, and welding is made accurately correcting by an arc sensor. Intermediate parts F, I, L, O, P between them not yet welded are welded by ordinary weaving welding. |
