| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing device for a welded steel pipe which achieves correctly grasping a state of inner face welding.SOLUTION: A manufacturing device 1 for a welded steel pipe includes: an outer face welding torch 4 performing outer face welding on an open pipe 2 to make a welded steel pipe 5; and an inner face welding torch 6 for performing inner face welding on the welded steel pipe 5. A laser displacement gauge 11 is arranged at a part positioned on the downstream side of the outer face welding torch 4. An arc monitoring camera 12 is arranged between the laser displacement gauge 11 and the inner face welding torch 6. In addition, a laser displacement gauge 13 is arranged on the downstream side of the inner face welding torch 6. The laser displacement gauge 11, the arc monitoring camera 12 and the laser displacement gauge 13 are respectively provided inside the welded steel pipe 5, which allows to directly monitor a state of an inner face bead 5a after the outer face welding, a state of the arc generated from the inner face welding torch 6, and a state of an inner face bead 5b after the inner face welding. |
