| 摘要 |
PURPOSE:To reduce manday remarkably by enabling welding incorporating bent tubes in straight tubes. CONSTITUTION:Straight tubes 11... and bent tubes 12... are combined and held between an upper pressure roller 2 and a lower pressure roller 3, and moved in the direction of the arrow while applying pressure, and both are welded by welding torches 1.... Welding is suspended just before curved parts of bent tubes 12, 12. The upper pressure roller 2 and welding torches 1... are raised and curved parts of bent tubes 12, 12 are passed. After the curved parts passed, the upper pressure roller 2 and welding torches 1... are lowered. Welding is performed again, and, for instance, a tube panel of flame wall of a boiler is manufactured. |
