Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Mechanical Behavior of Weldbond Joint of 1.2GPa Grade Ultra High Strength TRIP Steel for Car Body Applications

차체용 1.2GPa급 초고장력 TRIP강의 Weldbond 접합부의 기계적 거동

  • 이종대 (한국생산기술연구원 용접접합연구실용화그룹/마이크로조이닝센터) ;
  • 이소정 (한국생산기술연구원 용접접합연구실용화그룹/마이크로조이닝센터) ;
  • 방정환 (한국생산기술연구원 용접접합연구실용화그룹/마이크로조이닝센터) ;
  • 김동철 (한국생산기술연구원 용접접합연구실용화그룹/마이크로조이닝센터) ;
  • 강문진 (한국생산기술연구원 용접접합연구실용화그룹/마이크로조이닝센터) ;
  • 김목순 (인하대학교 신소재공학과) ;
  • 김준기 (한국생산기술연구원 용접접합연구실용화그룹/마이크로조이닝센터)
  • Received : 2014.07.02
  • Accepted : 2014.09.24
  • Published : 2014.10.31
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Abstract

The effect of weldbond hybrid joining process on the mechanical behavior of single lap and L-tensile joints was investigated for the newly developed 1.2GPa grade ultra high strength TRIP(transformation induced plasticity) steel. In the case of single lap shear behavior, the weldbond joint of 1.2GPa TRIP steel showed lower maximum tensile load and elongation than that of the adhesive bonding only. It was considered to be due to the reduction of real adhesion area, which was caused by the degradation of adhesive near the spot weld, and the brittle fracture behavior of the spot weld joint. In the case of L-tensile behavior, however, the maximum tensile load of the weldbond joint of 1.2GPa TRIP steel was dramatically increased and the fracture mode was change to the base metal fracture which is desirable for the spot weld joint. These synergic effect of the weldbond hybrid joining process in 1.2GPa TRIP steel was considered to be due to the stress dissipation around the spot weld joint by the presence of adhesive which resulted in the change of crack propagation path.

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References

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