| 摘要 |
PURPOSE:To perform easily a link welding of a pipe and pipe even with narrow intervals of each pipe in case of linking with pipe bundling condition by welding the end part of the joining side of one part of a pipe with utilizing the aperture formed by its cutting off. CONSTITUTION:A working hole 4 is formed with cutting off the cutting plate 3 for working on the end part of the joining side of one part of the pipe, for instance, a pipe 1 of two pieces of pipes 1, 2. A bevelling 6 is formed on the butt welding part 5 of pipes 1, 2, namely at the inner side of zone A with leaving the zone B around the hole 4 and also a similar bevelling to the bevelling 6 is formed on the welding part 7 between the pipe 2 and plate 3, namely on the outside of the zone C. A bevelling 9 is further formed on the outside of the welding part 8 between the plate 3 and the peripheral edge of the hole 4. The welding part 5 is then welded from the inner side with inserting a welding torch from the hole 4 and after welding completion of the bevelling 6 the bevelling 9 of the welding part 8 is welded from the outside with setting the plate 3 to the hole 4. The pipes 1, 2 are joined by closing the hole 4 with welding the bevelling of the welding part 7 from outside after welding completion of the bevelling 9. |
