Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Analysis on the Characteristic of Current Waveform and Welding for SM45C Using FCAW According to Gas Mixture Ratio

FCAW를 이용한 SM45C의 혼합가스비율에 따른 전류파형 및 용접특성 연구

  • Lee, JongHun (Department of Mechanical and Automotive Engineering, Kongju National University) ;
  • Lim, ByungChul (Department of Mechanical and Automotive Engineering, Kongju National University) ;
  • Park, SangHeup (Department of Mechanical and Automotive Engineering, Kongju National University)
  • Received : 2014.07.02
  • Accepted : 2014.11.03
  • Published : 2014.12.15
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Abstract

This study, analyzed the waveform and mechanical properties of flux cored arc Welding on SM45C. $CO_2$ 10% + Ar 90% shows the lowest standard deviation and shunt ratio at which the arc was most stable. $CO_2$ 10% + Ar 90% is equal to $CO_2$ 20% + Ar 80%. therefore, $CO_2$ 20% + Ar 80% is the best of mixture gases. The hardness test result for the gas mixture ratio of $CO_2$ 10% + Ar 90% was HV 249.7 which is the highest measured value. According to tensile test results, the tensile strength increased with increasing Ar in the mixture gas. This was because of the inertness of the argon, which does not combine with other elements, causing $CO_2$ to combine with pearlite and ferrite and decreasing the maximum tensile strength. Microstructural examination results show that with increasing Ar, ferrite generation decreases while the mild microstructure increases which influences the hardness.

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