SHIELDING MATERIAL FOR BACK SHIELD WELDING PROCESS, AND BACK SHIELD WELDING PROCESS

摘要

PROBLEM TO BE SOLVED: To provide a shielding material which securely shields the circumference of a weld zone at the inside of a pipe from the open air by a simple operation upon piping welding to form an inert atmosphere, and further, after the welding, can be easily removed by water washing in a short time.;SOLUTION: The shielding material 10 for a back shield welding process forming an inert gas packing space around a weld zone 2, inserted into the inside of a pipe material 1 to be welded in the inert atmosphere is made into the shape of a disk obtained by molding a paper material.;COPYRIGHT: (C)2009,JPO&INPIT