고장력 강판 적용에 따른 자동차용 4겹 다층 점용접물의 용접성 및 적정 용접조건

Weldability and Optimum Welding Conditions on the 4 Lap Spot Welded Joint of High Strength Steel Sheets in Automobile

  • 권일현 (전북대학교 정밀기계공학과, 자동차신기술연구센터) ;
  • 김회현 (전북대학교 대학원 정밀기계공학과) ;
  • 백승세 (전북대학교 대학원 정밀기계공학과) ;
  • 양성모 (전북대학교 정밀기계공학과, 자동차신기술연구센터) ;
  • 유효선 (전북대학교 대학원 정밀기계공학과)
  • 발행 : 2006.05.01


Spot-welding is a widely used manufacturing method for thin-sheet components, especially in mass-production industries such as the car industry. Automobiles are often constructed by multi-lap spot welding to secure the passenger from the accident, where optimisation of the welding conditions is a major economic consideration. This research is conducted to investigate weldability characteristics with various welding conditions on the 4-lap spot welded joint of structural steel sheets in automobile. The relationship between the tensile-shear strength and the indentation depth has been investigated to propose the optimum welding conditions. The welding current and the welding time have a greater effect on the welding characteristics than the electrode force. It was found that the electrode force has a relatively close relationship with the expulsion occurrence. The design curves for optimum welding are proposed for the 4-lap spot welded joint.


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