METHOD OF WELDING SMALL-DIAMETER STAINLESS STEEL TUBES AND WELDING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a method of welding small-diameter stainless steel tubes which is capable of performing inert gas arc welding while preventing the occurrence of the temper colors produced in the weld zone of the small-diameter stainless steel tubes and the circumferential heat affected zone thereof and to provide a welding tool. ;SOLUTION: The small-diameter stainless steel tubes 11 and 12 to be welded are set inside a welding head 21 having a welding torch 36 for performing inert gas arc welding in such a manner that their respective end faces touch each other and the circumferential welding of the weld zone 35 of the small- diameter stainless steel tubes 11 and 12 facing each other is performed by the welding torch 36. At this time, the inert gas is passed inside the small-diameter stainless steel tubes 11 and 12 facing each other from one toward the other and further, the inert gas is passed into the welding head 21 separately from the welding torch 36, by which the weld zone 35 and the heat affected zone around the same are sealed from the inside and outside by the inert gas and the occurrence of the temper colors in the weld zone 35 and the heat affected zone is prevented.;COPYRIGHT: (C)2003,JPO