Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Effects of Brazing Current on Mechanical Properties of Gas Metal Arc Brazed Joint of 1000MPa Grade DP Steels

1000MPa급 DP강 MIG 아크 브레이징 접합부의 기계적 성질에 미치는 브레이징 전류의 영향

  • Cho, Wook-Je (Hyundai materials, business environment team) ;
  • Yoon, Tae-Jin (Institute of materials technology, Pusan National University) ;
  • Kwak, Sung-Yun (Dept. of Material Science and Engineering, Pusan National University) ;
  • Lee, Jae-Hyeong (Dept. of Material Science and Engineering, Pusan National University) ;
  • Kang, Chung-Yun (Dept. of Material Science and Engineering, Pusan National University)
  • 조욱제 (현대머티리얼 환경사업팀) ;
  • 윤태진 (부산대학교 소재기술연구소) ;
  • 곽승윤 (부산대학교 재료공학과) ;
  • 이재형 (부산대학교 재료공학과) ;
  • 강정윤 (부산대학교 재료공학과)
  • Received : 2016.11.22
  • Accepted : 2017.02.15
  • Published : 2017.04.30
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Abstract

Mechanical properties and hardness distributions in arc brazed joints of Dual phase steel using Cu-Al insert metal were investigated. The maximum tensile shear load was 10.4kN at the highest brazing current. It was about 54% compared to tensile load of base metal. This joint efficiency is higher than that of joint of DP steel using Cu-based filler metals which are Cu-Si, Cu-Sn. Fracture positions can be divided into two types. Crack initiation commonly occurred at three point junction among upper sheet, lower sheet and the fusion zone. However crack propagations were different with increasing the brazing current. In case of the lower current, it instantaneously propagated along with the interface between fusion zone and upper base material. On the other hand, in case of higher current, a crack propagation occurred through fusion zone. When the brazing current is low (60, 70A), the interface shape is flat type. However the interface shape is rough type, when the brazing current is high (80A). It is thought that the interface shapes were the reason why the crack propagations were different with brazing current. The interface was the intermetallic compounds which consisted of $(Fe,Al)_{0.85}Cu_{0.15}$ IMC formed by crystallization at $1200^{\circ}C$during cooling. Therefore the maximum tensile shear load and the fracture behavior were determined by a interface shape and effective sheet thickness of the fracture position.

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References

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