Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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A Study on the Resistance Spot Weldability of 590 MPa Grade DP Steel with Modified Electrode Tip

가공 전극을 적용한 590 MPa급 DP강의 저항 점용접에 관한 연구

  • Lee, Sang-Min (Department of Advanced Materials Engineering, Dong-Eui University) ;
  • Park, Yeong-Do (Department of Advanced Materials Engineering, Dong-Eui University)
  • 이상민 (동의대학교 공과대학 신소재공학과) ;
  • 박영도 (동의대학교 공과대학 신소재공학과)
  • Received : 2009.08.27
  • Published : 2010.01.20
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Abstract

The use of advanced high-strength steels (AHSS) in automotive applications has steadily increased over the past few years. Two different failure modes are generally observed in shear-tension tests for resistance spot welds of AHSS. interfacial fractures and full button pullout. Despite high load-carrying capacity. the resistance spot welds in AHSS cue prone to interfacial fractures. To improve the load carrying ability of welds during shear-lap and cross tension tests. the tip surface of the electrode was grooved in a round shape. The electrode tip surface was modified so as to concentrate the current now in the central and circumferential portion of the electrode force. The results showed that the interfacial fracture was suppressed in welds using the modified electrode. In a comparison of failure mode during mechanical tests. the welds made with the modified electrode showed a higher tendency to fail via full button pullout fracture.

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