Mechanical characteristics and bead geometry according to laser welding parameters for tailor-welded-branks of hot press forming steel

레이저용접을 이용한 핫프레스포밍강의 맞춤식 재단 용접강판에서 용접공정변수에 따른 기계적 특성 및 비드형상

  • 강민정 (한국생산기술연구원 용접접합그룹) ;
  • 김철희 (한국생산기술연구원 용접접합그룹) ;
  • 서종덕 ((주)신영 기술연구소) ;
  • 임창용 ((주)신영 기술연구소)
  • Received : 2015.06.20
  • Accepted : 2015.06.26
  • Published : 2015.06.30

Abstract

A tailor welded blank (TWB) is a welded blank comprised of two or more sheets with different properties - thickness, strengths or formabilities. TWBs are applied to the body panels to reduce weight and cost of the part. In this research, ultra high strength steel and high ductility steel were joined and laser tailor welded blanks were implemented. Yb:YAG laser welding tests were conducted with various welding conditions, and mechanical and geometrical characteristics of weldments were evaluated.

Keywords

References

  1. M. Ono, A. Yoshitake, M. Ohmura, "Laser weldability of high strength steel sheets in fabrication of tailor welded blanks," NKK Technical Review, No. 86, pp. 13-18, 2002.
  2. N. Sreenivasan, M. Xia, Y. Zhou, "Effect of laser welding on formability of DP980 steel", Journal of engineering materials and technology, Vol. 130, pp. 041004, 2008. https://doi.org/10.1115/1.2969246
  3. J. Choi, M. Kang, J. Cho, C. Kim, "Laser welding characteristics of ultra high strength steel for automotive application," Journal of Korean Welding and Joining Society, Vol. 27, No. 5, pp. 471-474, 2009.
  4. C.-H. Kim, J.-K. Choi, M.-J. Kang, Y.-D. Park, "A study on the $CO_2$ laser welding characteristics of high strength steel up to 1500 MPa for automotive application," Journal of Achievements in Materials and Manufacturing Engineering, Vol. 39, No. 1, pp. 79-86, 2010.
  5. J. Choi, J. Kim, S. Shin, C. Kim, S. Rhee, "A study on laser welding characteristics of 1500MPa grade ultra high strength steel for automotive application," Journal of Korean Society of Laser Processing, Vol. 13, No. 3, pp. 19-26, 2010.
  6. C. Kim, M. Kang, Y.-N. Ahn, "Laser welding technology platform for automotive industry," Journal of Korean Society of Laser Processing, Vol. 14, No. 1, pp. 6-13, 2011.
  7. C. Kim, M. J. Kang, Y. D. Park, "Laser welding of Al-Si coated hot stamping steel, Engineering Procedia," Vol. 10, pp. 2226-2231, 2011. https://doi.org/10.1016/j.proeng.2011.04.368
  8. Y. Kim, K. Y. Park, B. Y. Lee, "A Study on Laser Weldability of Al-Si Coated 22MnB5 Steel for TWB Hot Stamping," Journal of KWJS, Vol. 31, No. 2, pp. 114-120, 2013.
  9. M. Kang, C. Kim, S.M. Bae, "Laser tailor-welded blanks for hot-press-forming steel with arc pretreatment," International Journal of Automotive Technology, Vol. 16, No. 2, pp. 279-283, 2015. https://doi.org/10.1007/s12239-015-0029-y
  10. M. Kang, C. Kim, "Laser welding for hot stamped tailor welded blanks with high strength steel/ high energy absorption steel," Journal of laser application, Vol. 26, No. 3, pp. 032007-1-6, 2014. https://doi.org/10.2351/1.4881279