Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
권호 표지
DOI QR코드

DOI QR Code

Lobe Curve Characteristic Analysis of Resistance Spot Welding for Sheet Combination of 780MPa Steel Sheet Using Simulation

시뮬레이션을 이용한 780MPa급 강재의 판재 조합에 따른 저항 점 용접의 로브곡선 특성 분석

  • Son, Chang-Seok (Dept. of Manufacturing and Automation, Pukyong National University) ;
  • Park, Young Whan (Dept. of Mechanical Engineering, Pukyong National University)
  • 손창석 (국립부경대학교 생산자동화공학과) ;
  • 박영환 (국립부경대학교 기계공학과)
  • Received : 2012.11.02
  • Accepted : 2012.12.31
  • Published : 2012.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Nowadays, car manufacturers tried to improve automotive fuel efficiency, and applied many high strength steels such as AHSS or UHSS to car bodies. Therefore, the number of steel combinations for the resistance spot welding are dramatically increased and the need for weldability evaluation of these combinations are also required. In this study, we suggest the lobe curve using FEM simulations for DP780 steel with 1.0t, 1.4t. The lobe curves which could expressed weldablity and optimal welding condition were obtained according to 6 steel combinations. There were two combinations for same steel sheet which were DP780 1.0t, DP780 1.4t. Dissimilar steel sheet combination with different thickness was 1.0t and 1.4t of DP780. Different steel combinations were DP780 1.0t and SPRC440 1.0t, and DP780 1.0t and DP590 1.0t. Finally dissimilar combinations was and DP780 1.0t and DP590 1.4t. The trend of low boundary and high boundary variation of lobe curve were analyzed with a viewpoint of the contact resistance and the heat input.

Keywords

References

  1. V. B. Hernandez, M. L. Kuntz, M. I. Khan, and Y. Zhou : Influence of Microstructure and Weld Size on the Mechanical Behaviour of Dissimilar AHSS Resistance Spot Welds, Science and Technology of Welding and Joining, 13-8 (2008) 769-776 https://doi.org/10.1179/136217108X325470
  2. Feulvarch, V. Robin, and J. M. Bergheau : Resistance Spot Welding Simuation : A General Finite Element Formulation of Electrothemal Contact Conditions, Journal of Materials Processing Technology, 153-154 (2004) 436-441 https://doi.org/10.1016/j.jmatprotec.2004.04.096
  3. B. H. Chang and Y. Zhou : Numerical Study on the Effect of Electrode Force in Small-scale Resistance Spot Welding Journal of Materials Processing Technology, 139 (2003) 635-641 https://doi.org/10.1016/S0924-0136(03)00613-7
  4. I. O. Santos, W. Zhang, V. M. Goncalves, N. Bay, and P. A. F. Martins : Weld Bonding of Stainless Steel, International Journal of Machine Tools and Manufacture, 44 (2004) 1431-1439 https://doi.org/10.1016/j.ijmachtools.2004.06.010
  5. N. Athi, J. D. Cullen, M. Al-Jader, S. R. Wylie, A. I. Al-Shamma'a, A. Shaw, and M. Hyde : Experimental and Theoretical Investigations to the Effects of Zinc Coatings and Splash on Electrode Cap Wear, Measurement, 42-6 (2009) 944-953
  6. S. Y. Lee, T. H. Ko, W. H. Kee, and Y. H. Jang : Weldability Evaluation of Resiststance Spot Welding using CAE Methodology, Journal of the 30th anniversary of the Korean Society of Automotive Engineers, 3 (2008) 1351-1356
  7. W. Zhang : Design and Implementation of Software for Resistance Welding Process Simulations, SAE Technical Paper, 112-5 (2003) 556-564
  8. T. H. Kim, D. O. Lee, and S. Rhee : Development of Resistance Spot Weldability Estimation Using Lobe Diagram for Steel Plate of Automobiles, Journal of KWS, 23-4 (2005) 59-65
  9. Q, Song, W. Zhang, and N. Bay : Contact Modelling in Resistance Welding. Part 1 : Algorithms and Numerical Verification, Journal of Engineering Manufacture, 220-5 (2006) 599 -606 https://doi.org/10.1243/09544054B05404
  10. Q, Song, W. Zhang, and N. Bay : Contact Modelling in Resistance Welding. Part 2 : Experimental verification, Journal of Engineering Manufacture, 220-5 (2006) 607-613 https://doi.org/10.1243/09544054B05504