Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on HAZ Softening Characteristics of Fiber Laser Weldment for High-Strength Steel

고장력강 파이버 레이저 용접부의 HAZ 연화 특성에 관한 연구

  • Park, Min-Ho (Department of Machanical Engineering, Mokpo University) ;
  • Kim, Ill-Soo (Department of Machanical Engineering, Mokpo University) ;
  • Lee, Jong-Pyo (Department of Machanical Engineering, Mokpo University) ;
  • Jin, Byeong-Ju (Department of Machanical Engineering, Mokpo University) ;
  • Kim, Do-Hyeong (Department of Machanical Engineering, Mokpo University) ;
  • Kim, In-Ju (Green mold Technology Center, Korea Institute of Industrial Technology) ;
  • Kim, Ji-Sun (Green mold Technology Center, Korea Institute of Industrial Technology)
  • 박민호 (목포대학교 기계공학과) ;
  • 김일수 (목포대학교 기계공학과) ;
  • 이종표 (목포대학교 기계공학과) ;
  • 진병주 (목포대학교 기계공학과) ;
  • 김도형 (목포대학교 기계공학과) ;
  • 김인주 (한국생산기술연구원 그린몰드기술센터) ;
  • 김지선 (한국생산기술연구원 그린몰드기술센터)
  • Received : 2015.03.30
  • Accepted : 2015.11.09
  • Published : 2015.12.30
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Abstract

Laser welding sector in the automotive industry has been widely recognized as one of the most important bonding processes, such as parts welding. Efforts to improve productivity and weld quality have been progressing steadily. In addition, laser welding is suitable for welding process that can produce high-quality welds suitable for flexible production and small quantity batch productions. In order to ensure the rigidity of the material, high strength material are applied to more than 1 GPa class body parts and automotive bumper beams. However, not only the situation is that the trend of domestic research, but also development is based on product molding considering freedom of shape where reinforcement is applied to meet the safety regulations and high-speed crash performance, despite the use of high strength materials. The tendency for heat-affected zone (HAZ) softening phenomenon common in areas of laser welded high tensile steel welding confirmed the occurrence of weld softening effect according to the process parameters. Based on this, range of process parameters could be selected for ensuring weld quality.

Keywords

References

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