| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of welding a seam part outer surface side of a UOE steel pipe capable of manufacturing a UOE steel pipe having a homogeneous seam outer surface welding part which has less variation in welding quality over the entire seam part, especially near the welding end.SOLUTION: The steel pipe 1 placed so that a welding groove becomes an upper part of the pipe is welded in a welding machine 2 while supporting the pipe with a plurality of supporting rollers 3 and a plurality of pressing rollers 4, which are arranged in the welding machine 2, to form the seam part outer surface side welding part. At that time, a lifting device is arranged in a conveying roller 6 at the exit of the welding machine 2. A sensor 20 is arranged near the end of the steel pipe. According to the vertical position of the steep pipe end detected by the sensor 20, the lifting device of the conveying roller 6 is operated, and the vertical position of the steel pipe end is adjusted to be stable in the predetermined region. Accordingly, the welding part with homogeneous quality is obtained in the tube longitudinal direction of the seam part outer surface side welding part. An LED light method sensor may be preferable chosen for the sensor 20. |
