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

  • 제23권6호
  • /
  • Pages.618-623
  • /
  • 2014
  • /
  • 2508-5093(pISSN)
  • /
  • 2508-5107(eISSN)
한국생산제조학회 (The Korean Society of Manufacturing Technology Engineers)
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FCAW를 이용한 SM45C의 혼합가스비율에 따른 전류파형 및 용접특성 연구

Analysis on the Characteristic of Current Waveform and Welding for SM45C Using FCAW According to Gas Mixture Ratio

  • 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)
  • 투고 : 2014.07.02
  • 심사 : 2014.11.03
  • 발행 : 2014.12.15
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초록

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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참고문헌

  1. Widgery David., 1994, Tubular Wire Weldling, Woodhead Publishing Ltd, Cambridge, England, 3-8.
  2. Ferree, S. E., 1995, New Generation of Cored Wires Creates Less Fume and Spatter, Welding Journal 74 45-48
  3. Liby, A. L., Dixon, R., Olson, D. L., 1990, Welding: Theory and Practice, Elsevier Science Publishers, The Netherlands.
  4. Cary, H. B., 1979, Modern Welding Technology, Prentice-Hall, United States.
  5. Nordmark, G. E., Mueller, L. N., Kelsey, R. A., 1982, Effect of Residual Stresses on Fatigue Crack Growth Rates in Weldments of Aluminum Alloy 5456 Plate, ASTM Special Technical Publication, 776 44-62.
  6. Adolfsson, S., Bahrami, A., Bolmsjo, G., Claesson, I., 1999, On-line Quality Monitoring in Short-circuit Gas Metal Arc Welding, Welding journal 78:2 59-73.
  7. Quinn, T. P., Smith, C., McCowan, C. N., Blachowiak, E., & Madigan, R. B., 1999, Arc sensing for defects in constant-voltage gas metal arc welding. Welding journal 78 322.
  8. Suh, C. M., & Kitagawa, H., 1987, Crack Growth Behavior of Fatigue Microcracks in Low Carbon Steels, Fatigue % Fracture Engineering Material Structure, 9:6 409-424. https://doi.org/10.1111/j.1460-2695.1987.tb00468.x
  9. Welding and Joining Handbook, 2007, process and thermal processing, Korean Welding and Joining Society, 3.
  10. Mita. T., 1988, Study for Reducing Spatter in CO sub 2 Gas Shielded Arc Welding. I. Waveform Control Method in CO sub 2 Gas Shielded Arc Welding. Q. J. Jpn. Weld. Soc., 209 6-2.