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자동차용 박강판 겹치기 이음부의 CO2 아크 용접에서 다중회귀분석기법을 이용한 용입깊이 예측에 대한 연구
이경민,심현우,권재형,윤북동,정민기,박문수,이보영 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.2
Welding is an essential process in the automotive industry. Most welding processes that are used for auto body are spot welding and CO2 welding are used in a small part. In production field, CO2 welding process is decreased and spot welding process is increased due to welding quality is poor and defects are occurred in CO2 welding process frequently. But CO2 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 CO2 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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자동차용 박강판 겹치기 이음부의 CO<sub>2</sub> 아크 용접에서 다중회귀분석기법을 이용한 용입깊이 예측에 대한 연구
이경민,심현우,권재형,윤북동,정민기,박문수,이보영,Lee, Kyung-Min,Sim, Hyun-Woo,Kwon, Jae-Hyung,Yoon, Buk-Dong,Jeong, Min-Ki,Park, Moon-Soo,Lee, Bo-Young 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.2
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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