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Study of the welding monitor and characteristics according to a change in Gas mixture by FCAW

FCAW의 혼합가스 변화에 따른 용접 모니터링과 특성에 관한 연구

  • Lim, Byung-Chul (Division of Mechanical Engineering, Graduate School, Kongju University) ;
  • Kang, Chul-Soon (Division of Mechanical Engineering, Technology & Management of Kongju University) ;
  • Park, Sang-Heup (Division of Mechanical & Automotive Engineering, Kongju University)
  • 임병철 (공주대학교 기계공학과) ;
  • 강철순 (공주대학교 테크노전략 대학원) ;
  • 박상흡 (공주대학교 기계자동차공학부)
  • Received : 2014.06.24
  • Accepted : 2014.10.10
  • Published : 2014.10.31

Abstract

In this study, the effect of varying the mixture gas during FCA welding was studied for an Atos 60 test piece. To examine the characteristics of welding, the weldability of the material was checked before welding and online monitoring was performed to examine the mechanical properties after welding. The mixture Ar 80% + $CO_2$ 20% at low speed gave very elegant beads with very little spatter. 100% $CO_2$ gave rise to high spatter generation. For Ar 80% + $CO_2$ 20%, the low current region due to the normal short circuits created spatter, which was more than double for 100% $CO_2$. This peak distribution occurred due to the instability of the arc. The tensile test result for Ar 80% + $CO_2$ 20%, Ar 90%+ $CO_2$ 10% and $CO_2$ 100% at 511MPa, 507MPa, and 469MPa showed that the yield strength was improved by 8.1 and 8.9% for 80%+ $CO_2$ 20% and Ar 90%+ $CO_2$ 10%, respectively, compared to 100% $CO_2$. The tensile test result at 622MPa, 609MPa, and 581MPa showed that the yield strength was improved by 7.0% for both the mixture gas compared to 100% $CO_2$.

Keywords

Mixture gas;FCAW(Flux Core Arc Welding);Welding monitoring;Shunt ratio;tension test

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