| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily apply welding groove aligning work for a pipe butt-welding joint, easily also to pipes different in outside diameters. <P>SOLUTION: A pipe end correction cloth 3 is wound around the butt-welding joint between the elliptically formed pipe 1 and pipe 2, both ends of the pipe end correction cloth 3 is fastened by a pipe end correction cloth fastening machine 4, to apply correction force for diameter-contracting long-diametric portions of the pipe 1 and the pipe 2, to the pipes 1, 2 along a thick arrow mark, outside diameters of the pipe 1 and the pipe 2 are thereby matched near to a perfect circle, and welding is performed thereafter in a welding groove between the pipe 1 and the pipe 2, by a slit provided in the pipe end correction cloth 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
