Journal of Welding and Joining

  • 제33권2호
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  • Pages.69-77
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  • 2015
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  • 2466-2232(pISSN)
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  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
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자동차 차체용 1.2GPa급 TRIP 강의 Weld-bond부 너깃경에 따른 인장전단특성에 관한 연구

A study on tensile shear characteristics for weld-bonded 1.2GPa grade TRIP steels with changes in nugget diameter for automotive body application

  • 최일동 (한국해양대학교 재료공학과) ;
  • 박지연 (한국해양대학교 재료공학과) ;
  • 김재원 (부산대학교 하이브리드 소재솔루션 협동과정) ;
  • 강문진 (한국생산기술연구원 용접접합연구그룹) ;
  • 김동철 (한국생산기술연구원 용접접합연구그룹) ;
  • 김준기 (한국생산기술연구원 용접접합연구그룹) ;
  • 박영도 (동의대학교 신소재공학과)
  • Choi, Ildong (Dept. of Materials Engineering, Korea Maritime and Ocean University) ;
  • Park, Jiyoun (Dept. of Materials Engineering, Korea Maritime and Ocean University) ;
  • Kim, Jae-Won (National Core Research Center (NCRC) for Hybrid Material Solution, Pusan National University) ;
  • Kang, Mun-Jin (Advanced Welding & Joining R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Dong-Cheol (Advanced Welding & Joining R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Jun-Ki (Advanced Welding & Joining R&D Group, Korea Institute of Industrial Technology) ;
  • Park, Yeong-Do (Dept. of Advanced Materials Engineering, Dong-Eui University)
  • 투고 : 2015.03.10
  • 심사 : 2015.04.23
  • 발행 : 2015.04.30
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초록

High strength steels have been continually being developed to improve in fuel economy in automotive and ensure safety of passengers. New bonding and welding methods have been required for improving weldability on high strength steels. In this study, resistance spot welding and Weld-bond with nugget diameters of 4.0mm, 5.0mm, 6.0mm and 7.0mm were produced and tested, respectively. In order to confirm the effect of nugget diameters on tensile shear characteristic of the Weld-bond, tensile shear characteristics of Weld-bond were compared with those of resistance spot welding and adhesive bonding. Peak load of Weld-bond were increased as the nugget diameter increases. After appearing maximum peak load continuous fracture followed with second peak owing to load being carried by resistance spot weldment. Fracture modes of the adhesive layer in Weld-bond fractures were represented by mixed fracture mode, which are cohesive failure on adhesive part and button failure at resistance spot welds. The results showed that the tensile shear properties can be improved by applying Weld-bond on TRIP steel, and more apparent with nugget diameter higher than 5${\surd}$t.

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참고문헌

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