| 摘要 |
PURPOSE:To produce a welded steel pipe with high efficiency by sizing a steel pipe which is subjected to forming, welding, and bead removal in the same line, then heating, soaking and quick cooling the pipe under the tension applied thereon in a high frequency induction heating furnace, subjecting the pipe to bend setting and cutting the pipe to a prescribed size. CONSTITUTION:A titled method consists of a stage wherein a pipe making stage and a heating and cooling stage are arranged in tandem, and a steel strip is formed to a pipe shape, a welding stage wherein the butt parts at both edges of a blank material formed to a pipe shape are welded, a weld bead removal stage wherein the weld beads of the welded steel pipe are removed, a sizing stage wherein the outside diameter of the steel pipe is sized, a heating stage wherein the sized steel pipe is heated under the proper tension applied thereon in a high frequency induction heating furnace, a soaking stage wherein the heated steel pipe is soaked at a prescribed temp., a quick cooling stage, a bend setting stage wherein the bend of the steel pipe is set, and a cutting stage wherein the pipe subjected to the bend setting is cut to a prescribed size. |
