| 摘要 |
PURPOSE:To reduce, a cost by a method wherein both ends of a joint are firmly secured to a steel pipe for temporary welding, and after the intermediate of a joint member is temporarily welded in a manner to keep a gap between the stel pipe and the joint member in a condition in that the bead of the steel pipe is left unremoved, it is regularily welded. CONSTITUTION:A small iron piece is inserted in a position located about 600-700mm away from the end of a joint member 1, and the joint member 1 is firmly adhered about 500-600mm long to a steel pipe 3 for continuous temporary welding. A gap between the joint member 1 and the steel pipe 3 is held at a distance of 2-3mm through the medium of jigs 8, and a portion, allowing a weld bead part 4 on the external surface of the steel pipe 3 to be firmly adhered to the joint member 1, is secured by spot welding 7. After the jigs 8 are removed, the joint member 1 is regulaily welded to the steel pipe 3. |
