Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Prediction of the Penetration Depth on CO2 Arc Welding of Steel Sheet Lap Joint with Fillet for Car Body using Multiple Regression Analysis Technique

자동차용 박강판 겹치기 이음부의 CO2 아크 용접에서 다중회귀분석기법을 이용한 용입깊이 예측에 대한 연구

  • Lee, Kyung-Min (Dept. of Aerospace and Mech. Eng., Graduate school of Korea Aerospace Univ.) ;
  • Sim, Hyun-Woo (Dept. of Aerospace and Mech. Eng., Graduate school of Korea Aerospace Univ.) ;
  • Kwon, Jae-Hyung (Dept. of Aerospace and Mech. Eng., Graduate school of Korea Aerospace Univ.) ;
  • Yoon, Buk-Dong (Dept of Gwangju Body Manufacturing Engineering Team of KIA MOTORS) ;
  • Jeong, Min-Ki (Dept of Gwangju Body Manufacturing Engineering Team of KIA MOTORS) ;
  • Park, Moon-Soo (New Technology Development Team, Hyundai NGV Co. Ltd.) ;
  • Lee, Bo-Young (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.)
  • 이경민 (한국항공대학교 항공우주 및 기계공학부 대학원) ;
  • 심현우 (한국항공대학교 항공우주 및 기계공학부 대학원) ;
  • 권재형 (한국항공대학교 항공우주 및 기계공학부 대학원) ;
  • 윤북동 (광주 기아자동차 차체생기팀) ;
  • 정민기 (광주 기아자동차 차체생기팀) ;
  • 박문수 (현대 NGV) ;
  • 이보영 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2012.02.17
  • Accepted : 2012.04.30
  • Published : 2012.04.30
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Abstract

Welding is an essential process in the automotive industry. Most welding processes that are used for auto body are spot welding and $CO_2$ welding are used in a small part. In production field, $CO_2$ welding process is decreased and spot welding process is increased due to welding quality is poor and defects are occurred in $CO_2$ welding process frequently. But $CO_2$ welding process should be used at robot interference parts and closed parts where spot welding couldn't. Because of the 0.65mm ~ 2.0mm thickness steel sheet were used in the automotive industry, poor quality of welding area such as burn through and under fill were happened frequently in $CO_2$ process. In this paper, we will study about the penetration depth which gives a huge impact on burn through changing a degree of base metal, welding position and torch angle. Voltage, current and welding speed were fixed but degree of base metal, welding position and torch angle were changed. And Cold- Rolled(CR) steel sheet was used. Penetration depth was analysed by multiple regression analysis to derive approximate calculations. And reliability of approximate calculations were confirmed through additional experiments. As the results of this research, we confirmed the effect of torch and plate angle to bead shape. And we present a possibility that can simulate more accurate to weld geometry, as deduced the verification equations that has tolerance of less than 21.69%.

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References

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