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Journal of KWJS 2008;26(6):42-47.
Published online January 13, 2009.
A-TIG 용접에서 용입 형상비에 미치는 아크길이와 실드가스의 영향
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The Eeffect of Arc Length and Shield Gas on Penetration Aspect Ratio in A-TIG Welding
In-Ki Park, Hyo-Sik Ham, Sang-Myung Cho
Abstract
  TIG welding enables to produce high quality weldment. However it has some problems such as shallow penetration and large distortion due to low penetration aspect ratio after welding. In order to overcome those problems, there are many ongoing studies on A-TIG welding, which use active flux.
  In this study, the effect of arc length and shield gas on penetration aspect ratio with melt-run welding on STS 304 6t, on which active flux was spreaded, was investigated. Arc length was changed from 1mm to 3mm, and aspect ratio became higher as arc length was decreased in this range. 100% Ar gas, Ar-H2 mixed gas, Ar-He mixed gas, and 100% He gas were used as shield gas in this study. When Ar-H2 mixed gas, Ar-He mixed gas, and 100% He gas were applied, penetration and melting efficiency were both increased as compared with 100% Ar gas. Aspect ratio was the highest with Ar-2.5% H₂ mixed gas.
Key Words: Aspect ratio, Penetration, A-TIG, Arc length, Shield gas, Arc voltage, Active flux, Melting efficiency


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