고속 대전류 Super_TIG용접

Abstract

TIG welding is today one of the most popular arc welding process because of its high quality welds and low equipment costs. This is necessary welding process in industry fields. But TIG welding has limited application because of low productivity. Even if welding productivity increases with welding speed and current, this strategy is limited by the appearance of defects such as undercut and humping bead due to a very depressed molten metal by arc pressure at high current and high speed. Humping in one of the most common defects that limit welding productivity. Most industry fields needed high-current, high-speed welding do not trying to TIG welding. Therefore We need a study on application methodology of high current, high speed TIG welding. The purpose of this study is to develop high-speed welding process by Super_TIG welding that overcame TIG productivity. High-speed Super_TIG welding Experiment of this study was proceed on thickness 16mm SS400. Deposited area was fixed 20mm2. Welding speed was changed from 60cm/min to 130cm/min. Also Shield gas was changed Ar 100%, Ar-He 30%, Ar H2 3%. Consequently, this study obtained good bead appearance and welds by Welding speed 130cm/min, Deposition rate 12.5kg/hr, deposited area 20mm2.