Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Porosity Reduction during Gas Tungsten Arc-Gas Metal Arc Hybrid Welding of Zinc Coated Steel Sheets (II) - Hybrid Welding Results

GTA-GMA 하이브리드공정에 따른 자동차용 아연도금강판의 용접부 기공감소 (II) - 하이브리드공정 적용 결과

  • 안영남 (한국생산기술연구원 용접접합그룹) ;
  • 김철희 (한국생산기술연구원 용접접합그룹)
  • Received : 2016.03.15
  • Accepted : 2016.06.17
  • Published : 2016.08.31
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Abstract

The use of Zn coated steel has increased in the automotive industry due to its excellent corrosion resistance. Conventionally the BIW(body-in-white) structure and the hang-on parts have been made of Zn coated steel and more recently Zn coated steel began to be applied in the chassis parts. During gas metal arc (GMA) welding of the chassis part, lap fillet joint used to be adopted but spatter generation and porosities are most important concerns. In the industrial applications, an intentional joint gap was made to avoid the weld defects but it is not easy to control the size of joint gap. In this research, gas tungsten arc (GTA) is combined with GMA welding where GTA precedes GMA. As pulsed arc was adopted as GMA, GTA was oscillated along the longitudinal direction by pulsing GMA, but the arc oscillation did not disturb the molten droplet transfer of GMA welding. By increasing the distance between GTA and GMA, the length of weld pool increased and porosity could be reduced. Moreover porosity in the welds was fully removed when the distance between two arcs was 15 mm.

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References

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