While letting flow the gas which designates the

摘要

PROBLEM TO BE SOLVED: To obtain a welding bead with a deep penetration by high current which has been difficult in the conventional TIG welding.;SOLUTION: In the hollow electrode 16 used for TIG welding, while flowing a gas essentially composed of an inert gas to the inside and outside of the electrode, which performs arc discharge from the tip of the electrode to weld a base material, a taper part 16A tilted to the central axis is formed around the tip part of the electrode, and further, a groove part 16B continuous to the radial direction is formed at one part around the tip part or the opposed two parts.;COPYRIGHT: (C)2011,JPO&INPIT