• Title/Summary/Keyword: TIG

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TIG Welding Process Monitoring using Photo Diode (광소자를 이용한 TIG 용접 가공의 모니터링)

  • 장욱진;김재도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.383-388
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    • 1995
  • The ARC light has been measured using photo-detect system under different TIG welding condition. Light detect system consists of photo diode, ND Filter, OP Amp. A/D convertor and PC. The purpose of this experiment is to show the relationship between ARC light and process variables such as welding current, torch travel speed, etc. The results can be applied to estimate the condition of welding process and the quality of welding products. The signal of ARC light has periodic patterns in good TIG welding condition whereas in abnormal condition the signal has different pattern. Amount of Ar shielding gas and distance from electrode to specimen affect the signal pattern significantly.

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Study on Narrow groove TIG welding using Ar-He of shielding gas & hot wire (Ar-He 혼합가스와 hot-wire를 이용한 협개선 TIG 용접에 관한 연구)

  • Choe, Jun-Tae;Park, Jong-Ryeon;Kim, Dae-Sun
    • Proceedings of the KWS Conference
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    • 2005.06a
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    • pp.346-348
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    • 2005
  • TIG welding can produce high quality of weld, but has the disadvantage of low productivity and high possibility of lack-of-fusion especially on heavy wall groove welding. In order to overcome such demerits of TIG welding, the hot-wire method which provides pre-heated wire and the use of He-Ar mixture gas as shielding gas were adopted. Through this study, both methods were turned out to be beneficial to the prevention of lack-of-fusion and the increase of productivity and welding speed.

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Weldability Increase of Aluminum by Variable Polarity Arc (가변 극성 아크의 알루미늄 용접성 향상에 관한 연구)

  • Cho, Jungho
    • Journal of Welding and Joining
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    • v.32 no.1
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    • pp.108-111
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    • 2014
  • Low arc weldability of aluminum alloy is enhanced by applying variable polarity TIG and the result is theoretically investigated to figure out the mechanism. Conventionally, it is well known fact that DCEP (reverse polarity) arc is effective on aluminum welding. The reason is due to oxide layer removal by plasma ion bombardment and therefore it is named as cleaning effect. Another fact of polarity characteristic is that DCEN shows higher heat input efficiency therefore conventional variable polarity arc used to apply DCEP portion as small as possible. However, higher DCEP portion shows bigger weldment in this research and it is explained by adopting a theory of arc concentration on oxide layer with tunneling effect which was not clearly mentioned before in several variable polarity TIG welding research. Disagreement between variable polarity TIG welding result and conventional arc polarity theory is rationally explained for the first time with help of electron emission theory.