METHOD FOR MANUFACTURING SPIRAL WELDED STEEL PIPE

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a spiral welded steel pipe which does not increase an oxygen quantitiy at a weld zone even in the case of high-speed welding, can prevent the overlap of the weld zone from occurring and also can prevent the deterioration of the impact strength of the weld zone. SOLUTION: The spiral welded steel pipe is manufactured by welding both crosswise edges of a steel strip 1 in the submerged arc welding method while the steel strip (hot rolled coil) 1 with mill scale on the surface is formed into a spiral. High-speed welding is performed after the mill scale on both edges of the steel strip 1 is removed. COPYRIGHT: (C)2004,JPO