Effect of He Mixing Ratio on the Characteristic of TIG Welding with High Current and High Speed

Oh, Dong-Soo; Kim, Yeong-Sik; Cho, Sang-Myung

Journal of KWJS 2005;23(3):54-60.
Published online July 15, 2005.

[연구논문]대전류 고속 TIG 용접 특성에 미치는 He 혼합비의 영향

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Effect of He Mixing Ratio on the Characteristic of TIG Welding with High Current and High Speed

Dong-Soo Oh, Yeong-Sik Kim, Sang-Myung Cho

Abstract

Tungsten Inert Gas(TIG) welding is today one of the most popular are welding process because of its high quality welds and low equipment costs. 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 the depressed molten metal. The purpose of this study investigates the effects of He mixing ratio on the characteristics with high current and speed in TIG welding. The conclusions obtained permit to explain the are start characteristics quantitatively and the maximum welding speed on stable bead formation with He mixing ratio for high current and speed TIG welding observed in experiments. Also through the relation of the maximum are pressure and surface depression depth at high current and speed TIG welding, it made clear the mechanism of unstable bead formation.