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The Study on Weldability of Boron Steel and Hot-Stamped Steel by Using Laser Heat Source (II) - Laser Weldability of Hot Stamping Steel with Ultra-High Strength -

레이저 열원을 이용한 보론강 및 핫스탬핑강의 용접특성에 관한 연구 (II) - 초고강도 핫스탬핑강의 레이저 용접특성 -

  • Kim, Jong Do (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Choi, So Young (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Park, In Duck (Busan Laser Application Support Center, Korea Institute of Machinery & Materials)
  • 김종도 (한국해양대학교 기관공학부) ;
  • 최소영 (한국해양대학교 기관공학부) ;
  • 박인덕 (한국기계연구원 부산레이저기술지원센터)
  • Received : 2014.09.29
  • Accepted : 2014.10.13
  • Published : 2014.12.01

Abstract

Hot-stamping is a method of obtaining ultrahigh-strength steel by simultaneously forming and cooling boron steel in a press die after it has been heated at $900^{\circ}C$ or above. After heat treatment, boron steel has a strength of 1500 MPa or more. This material ensures a high level of quality because it overcomes the spring-back phenomenon, which is a problem associated with high-strength steel materials, and the degree of dimensional precision is improved by 90 or more because of the good formability compared with existing types of steel. In this study, the welding characteristics were identified through the butt and lap welding of hot-stamped steel using a disk laser. Full penetration was obtained at a faster speed with butt welding compared to lap welding, and a white band was observed in every specimen.

Keywords

Hot Stamping Process;Laser Welding;Welding Patameters

References

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