| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a seam-welded steel pipe with good tenacity of a weld capable of manufacturing the seam-welded steel pipe whose welded portion has the desired good tenacity even if the dimensions of the steel band used as a base metal vary. SOLUTION: Groove shapes are given to the edges 4a, 4b of an open pipe 4. The edges 4a, 4b are continuously imaged by an edge shape monitor 11 immediately before seam welding. The captured image is inputted into a computing device 14 and subjected to image processing. Thus, the groove depth (h) is measured. According to the determination result, an optimum welding power is computed, and the welding power from a welding power generating device 6 is adjusted. COPYRIGHT: (C)2008,JPO&INPIT
|
