Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on the Development of Electric Resistance Welding of DP780 Grade Steel for Hydroforming Tube

하이드로포밍용 DP780MPa급 강판의 전기저항용접 강관 개발에 관한 연구

  • 박성필 (현대하이스코 신제품개발연구소) ;
  • 권용재 (울산대학교 첨단소재공학과)
  • Received : 2014.09.16
  • Accepted : 2014.12.30
  • Published : 2015.05.01
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Abstract

To achieve lightweight design, research & development of various lightweighting technologies such as hydroforming are underway worldwide. In the case of hydroforming, application of ultra high strength steel is essential for weight reduction of the car. However, considering common high-strength carbon steel, it is not suitable to the actual hydroformed parts since the lack of formability. DP steel offers an outstanding combination of strength and formability as a result of their microstructure. DP steel has high strength and good formability but it's difficult to secure stable quality of welding section because of softening of weld section and chemical composition. Therefore, most of companies use LASER welding when making high strength tube. Electric resistance welding is excellent production method for steel tube manufacturing considering the productivity. Optimum electric resistance welding technology is needed to be developed for application of high strength hydroformed parts using DP steel. This study is comprehensive research & development from electric resistance welding to actual formabililty evaluation.

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References

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