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http://dx.doi.org/10.5762/KAIS.2014.15.10.5933

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

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)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.15, no.10, 2014 , pp. 5933-5938 More about this Journal
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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Times Cited By KSCI : 3  (Citation Analysis)
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