Evaluation of Weldability on the Resistance Spot Welding of DP60 Steels for Automotive Chassis

자동차 새시용 DP60강 인버터 DC 저항 점용접의 용접성 평가

  • Received : 2011.11.15
  • Accepted : 2011.12.17
  • Published : 2011.12.31

Abstract

This study analyzes the resistance spot weldability of DP60 steels. To analyze the resistance spot weldability of DP60 steels, tensile strength test and macro-section test were conducted for the resistance spot welds. Acceptable welding conditions were determined as a function of the resistance spot welding process parameters such as electrode force, welding time, and welding current. The lower limit of the welding lobe was the minimum shear tension strength for 590MPa-grade steel while the upper limit was determined whether or not expulsion was detected.

Keywords

Acknowledgement

Grant : 차세대 자동차용 1GPa급 고강도강 적용을 위한 신 용접/접합 공정 및 실용화 기술개발

Supported by : 한국생산기술연구원

References

  1. A. Yoshitake, K. Sato and Y. Hosoya, "A Study on Improving Crashworthiness of Automotive Parts by using High Strength Steel Sheets", SAE paper, pp. 980-382 (1998)
  2. T. Lwamoto, T. Tsuta and Y. Tomita, "Investigation on Deformation Mode Dependence on train-Induced Martensitic Transformation in TRIP Steels and Modeling of Transformation Kinetics", Int. J. Mech. Sci., Vol.40, pp. 13-182, 1998
  3. Andreas Rupp, Klaus Storzel and Vatroslav Grubisic, "Computer Aided Dimensioning of Spot-Welded Automotive Structures", SAE Paper, pp. 950-711, 1995
  4. D. H. Bea, "Fracture mechanical evaluation of fatigue strength of a single spot welded lap joint under tension-shear load", Journal of Korea Society of Automotive Engineers, Vol. 13, No. 5, pp. 42-50, 1990
  5. I. J. Kim, J. K. Kim, "A Study on Effect of Flex Additions for Selecting the Process Parameters in GMA Welding processes", Journal of Korean Soc. of Mechanical Technology, Vol. 13(1), 17-22, 2011
  6. S. B. Oh, S. S. Son, D. H. Bea, "Fatigue Strength Evaluation on the IB-Type Spot-welded Lap Joint of 304 Stainless Steel Part 1 : Maximum Principal Stress", Conference of Korea Society of Automotive Engineers, pp. 762-767, 1998
  7. S. S. Park, S. M. Lee, Y. J. Cho, N. H. Kang, J. H. Yu, Y. S. Him, and Y. D. Park, J. Kor. Inst. Met. & Mater. 46, pp. 672, 2008
  8. B. Grirvin, W.Peterson, and J. Gould, "American Iron and Steel Inst. 27", A10, 2007