B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
78/48
B21C 37/08 (2006.01) B23K 5/02 (2006.01) B23K 9/025 (2006.01) C21D 9/50 (2006.01)
Patent
CA 1197118
Abstract of the Disclosure A UO steel pipe welding method for welding an inner seam of a UO steel pipe along an inner groove by welding electrodes held by a boom which is supported by a tracing roller moving along the inner groove of the steel pipe. According to the invention, at least one metal plate is urged against at least one end of the steel pipe after tack welding the seam on an opposite side of the inner groove of the steel pipe to be welded, and lateral angular deformations of the end of the steel pipe on both sides of the seam due to a load of the boom when the tracing roller leaves the end of the steel pipe onto the metal plate, thereby preventing hot cracking at the end of the pipe. According to the invention, moreover, portions of the steel pipe on both sides of a distal end of a weld bead at the end of the pipe are heated to cause expansion displacements of the heated portions directing toward a center of the weld bead or high temperature portions of the steel pipe after a heat source for the seam welding has passed therethrough are cooled, thereby reducing tearing forces acting upon the weld bead to prevent the hot cracking at the end of the pipe more effectively.
428601
Kamada Akio
Kawabata Fumimaru
Matsuyama Junya
Miyake Shigeru
Uegaki Tatsufumi
Kawasaki Steel Corporation
Smart & Biggar
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