GTA welding equipment and the welding method

摘要

PROBLEM TO BE SOLVED: To provide a GTA welding apparatus having a hollow electrode and a welding method therefor, by which a high quality welded portion can be achieved without requiring a mechanical oscillation even in a welding portion for different materials or different thicknesses of plates.;SOLUTION: The electrode is arranged in a tubular torch 12 along the axial direction. The electrode is configured as the hollow electrode 13 having a hole for jetting gas from a gas supplying portion provided in the torch. The hollow electrode is gas-tightly supported in the inside peripheral surface of the torch via a sealing portion 14, and the tip end of the hollow electrode is projected from the torch. A welding arc is generated by blowing the welding gas supplied to the torch on an object 15 to be welded via the inside of the hollow electrode. The hollow electrode is configured such that the cross sectional shape or the cross sectional area of the aperture of a gas blowing port 13b at least at the tip end of the hole of the hollow electrode is different in the welding travel direction and in the direction perpendicular to the welding travel direction.;COPYRIGHT: (C)2006,JPO&NCIPI