| 摘要 |
PURPOSE:To enable a high speed TIG welding with deepening of the penetration depth of a weld zone by simultaneously welding a plate stock and pipe stock slipping off the position in the progressing direction from both faces of the front and back. CONSTITUTION:The welding torches 2, 3 being opposed respectively on the front side and back side of the weld zone of a pipe 1 by rotating the pipe 1 in the arrow mark direction shift the position by the prescribed distance lin the turning direction, i.e., welding direction of the pipe 1. CO2 welding or TIG welding is performed by the preceding welding torch 2 and TIC welding is performed by the succeeding welding torch 3.
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