| 摘要 |
PROBLEM TO BE SOLVED: To provide a method that enables a high-speed production of TIG welded pipe by binding neighborhood of a puddle-to-solidifying portion of welds on the metal pipe when forming the pipe with welding. SOLUTION: The production method of the metal pipe includes roll forming a flat plate into a cylindrical shape and TIG welding. After abutting edges of the cylindrical form are welded, the pipe is bound by a group of front rolls split into four positioned 45 degrees rotated from the welds around the pipe axis and a group of rear rolls split into four positioned 90 degrees rotated from the welds around the pipe axis and apart from the front roll a distance less than the diameter of the rear roll. |
