The Characteristics on Arc Pressure Distribution of TIG Welding with Shield Gas Mixing Ratio

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

Journal of KWJS 2005;23(1):41-47.
Published online April 29, 2005.

[연구논문] TIG 용접에서의 실드 가스 혼합비에 따른 아크 압력분포 특성

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The Characteristics on Arc Pressure Distribution of TIG Welding with Shield Gas Mixing Ratio

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

Abstract

Arc pressure is one of important factors in understanding physical arc phenomena. Especially it affects on the penetration, size and shape of TIG welding. Some researches were reported on the effect of arc pressure in low and middle current region. But there are not any research in high current region. The purpose of this study is to investigate the arc pressure distribution with mixing ratio of shield gas such as Ar and He gases. A Cu block with water cooling was specifically designed and used as an anode electrode in order to measure the arc pressure in high current region. Then, the arc pressure distribution was measured with change in welding current and mixing ratio of shield gases. The arc force was obtained by numerically integrating the measured results. As the results, it was shown that the arc pressure was concentrated at the central part of the arc in middle and high current regions when a pure Ar gas was used. In case of Ar + He mixing gas, the arc pressure was much lower than that of pure Ar gas. In addition, it was widely distributed to radial direction.