한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제20권5호
  • /
  • Pages.53-64
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  • 2012
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  • 1225-6382(pISSN)
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  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
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고장력 강판(SPFC590)의 레이저 용접부 피로거동 평가

Evaluation of Fatigue Behavior for Laser Welded High Strength Steel Sheets (SPFC590)

  • 허철 ((주)금창 기술연구소) ;
  • 권종완 (경일대학교 기계자동차공학부) ;
  • 조현덕 (경일대학교 ACT-RIC) ;
  • 최성종 (경일대학교 ACT-RIC) ;
  • 정우영 (자동차부품연구원 금속소재연구팀)
  • 투고 : 2011.10.26
  • 심사 : 2012.03.07
  • 발행 : 2012.09.01
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초록

Deep and narrow welds can be produced by laser welding at high welding speeds with a narrow heat-affected zone (HAZ) and little distortion of the workpiece. This study aims to evaluate the usefulness of laser welding at automobile component manufacture. Microstructure observation, hardness test, tensile test and fatigue life test are performed by using the fiber laser welded SPFC590 steel sheets which is used widely in the manufacture of automotive seat frame. Three kinds of specimens are only a SPFC590 steel plate, quasi-butt joint plate and lap joint plate by laser welding. The following results that will be helpful to understand the static strength, fatigue crack initiation and growth mechanism were obtained. (1) The tensile strength of quasi butt joint specimens nearly equal to base metal specimens, but lap joint specimens fractured in shear area of weld metal. (2) The fatigue strength of quasi-butt joint specimen was approximately 8 percent lower than that of the base metal specimens. Furthermore, the lap joint specimens were less than 86 percent of the base metal specimens. (3) The lap joint fatigue specimens fractured at shear area in high level stress amplitude, while fractured at normal area in low level stress amplitude. From these results, the applicability of the laser welding to the automobile component is discussed.

키워드

참고문헌

  1. W. S. Chang, The Developments and Applications Trend of New Welding Techniques in Industry, RIST Welding Research Center, Pusan University Seminar Report, 2010.
  2. W. W. Duley, Laser Welding, John Wiley & Sons Inc., New York, 1999.
  3. The Trends of Laser Processing, MOST & KISTI Report, No. GOVP1200720111, pp.36-55, 2006.
  4. S. Kou, Welding Metallurgy, John Wiley & Sons Inc., New York, pp.29-33, 2002.
  5. K. Mori, "Application of Laser Processing for Automotive Body," Journal of the Japan Welding Society, Vol.72, No.1, pp.40-43, 2003. https://doi.org/10.2207/qjjws1943.72.40
  6. M. Uchihara and K. Fukuki, "The Performance of Tailor Welded Blanks Using High Strength Steel Sheets for Practical Use," Quarterly Journal of the Japan Welding Society, Vol.23, No.4, pp.549-557, 2005. https://doi.org/10.2207/qjjws.23.549
  7. M. Han and Y. Lee, "Fatigue Characteristics of SPFC590 Laser Welded Sheet Metal for Automobile Body Panel," Transactions of KSAE, Vol.11, No.1, pp.143-150, 2003.
  8. I. Maruyama, "Key Point of the $CO_{2}$ Laser Welding and it's Application for the Car Parts," Journal of the Japan Welding Society, Vol.68, No.3, pp.16-23, 1999.
  9. M. Ohara and Y. Miyazaki, "Microstructure and Hardness of Laser Welded Steel Sheets," Journal of the Japan Welding Society, Vol.68, No.6, pp.28-31, 1999.
  10. T. Otani, S. Tsukamoto, G. Arakane and A. Omori, "HAZ Properties of Ultra-fine Grained High Strength Steels Welded by High Power Laser," Quarterly Journal of the Japan Welding Society, Vol.21, No.2, pp.267-273, 2003. https://doi.org/10.2207/qjjws.21.267
  11. ASTM E8, Standard Test Methods for Tension Testing of Metallic Materials, 2009.
  12. M. Uchihara and K. Fukuki, "The Formability of Tailor Welded Blanks Using High Strength Steel Sheets," Quarterly Journal of the Japan Welding Society, Vol.23, No.4, pp.541-548, 2005. https://doi.org/10.2207/qjjws.23.541
  13. T. Kitamura, K. Mamejima, T. Terasaki and S. Takemura, "Effect of Strength of Steel Plate and Patterns of Welded Bead for Static Strength of Laser Welded Lap Joint," Preprints of the National Meeting of the Japan Welding Society, Vol.2007S, pp.42-43, 2007.
  14. ASTM E466, Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials, 2007.
  15. T. Terasaki and T. Kitamura, "Prediction of Static Fracture Strength of Laser Welded lap Joint by Numerical Analysis," Quarterly Journal of the Japan Welding Society, Vol.21, No.3, pp.419- 424, 2003. https://doi.org/10.2207/qjjws.21.419
  16. J. Lee, K. Asim and J. Pan, "Modeling of Failure Mode of Laser Welds in Lap-shear Specimens of HSLA Steel Sheets," Engineering and Fracture Mechanics, Vol.78, pp.374-396, 2011. https://doi.org/10.1016/j.engfracmech.2010.10.011
  17. ASM Handbook-formerly 9th Edn., Metals Handbook Vol.12, Fractography, ASM International, 1992.

피인용 문헌

  1. Effect of Weld Root Gap on Tensile Shear Strength in Dual Phase Steel vol.22, pp.3, 2018, https://doi.org/10.9726/kspse.2018.22.3.038