Journal of Welding and Joining

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

DOI QR Code

Applicability Study of 2-pass Laser Welding on Galvanized Steel Sheets

아연도금강판 겹치기 용접부에 대한 2패스 레이저용접 적용성 연구

  • 안영남 (한국생산기술연구원 용접접합그룹) ;
  • 강민정 (한국생산기술연구원 용접접합그룹) ;
  • 김철희 (한국생산기술연구원 용접접합그룹)
  • Received : 2016.04.19
  • Accepted : 2016.06.07
  • Published : 2016.08.31
Download PDF
⟨ Previous Next ⟩

Abstract

During laser overlap welding of galvanized steel sheets, explosion of weld pool by the high pressure zinc vapor induces weld defects like porosity and blowhole. In this study, laser 2-pass welding was implemented to prevent the weld defects. Through the 1st pass welding, zinc layers on the faying surfaces were removed when proper heat input was applied. Excessive heat input could result in explosion even during the 1st pass welding and insufficient heat input could not remove enough region of zinc layer for the 2nd pass welding. Coating weights of $45g/m^2$ and $60g/m^2$ were considered and for both cases sound welds without weld defects could be achieved. In spite of 2-pass welding, softening of weld and heat affected zone was not observed and Zn coating was not diluted into the weld metal.

Keywords

References

  1. C. Liang and A. Zheng, Material and joint technology of AUDI A6L white-body, Automobile Parts, 12 (2007), 34-35
  2. J. Xie and P. Denney, Galvanized steel joined with lasers, Welding Journal, 80(6) (2001), 59-61
  3. R. Akhter, W. Steen and K. Watkins, Welding Zinc Coated Steel with a Laser and the Properties of the Weldment, Journal of Laser Applications, 3(2) (1991), 9-20 https://doi.org/10.2351/1.4745277
  4. M. Graham, D. Hirak, H. Kerr and D. Weckman, Nd, YAG laser beam welding of coated steels using a modified lap joint geometry, Welding Journal, 75(5) (1996), 162s-170s
  5. A. Dasgupta, J. Mazumder and M. Bembenek, Alloying based laser welding of galvanized steel, Proceedings of 19th International Conference on Applications of Lasers and Electro-Optics, Laser Applications in the Automotive Industry, 91 (2000), A38-A45
  6. X. Li, S. Lawson, Y. Zhou and F. Goodwin, Novel technique for laser lap welding of zinc coated sheet steels, Journal of Laser Applications, 19(4) (2007), 259-264 https://doi.org/10.2351/1.2795755
  7. H. Gu and R. Mueller, Hybrid welding of galvanized steel sheet, Proceedings of 20th International Congress on Applications of Lasers & Electro-Optics, (2001), 135-139
  8. C. Kim, W. Choi, J. Kim and S. Rhee, Relationship between the weldability and the process parameters for laser-TIG hybrid welding of galvanized steel sheets, Materials transactions, 49(1) (2008), 179-186 https://doi.org/10.2320/matertrans.MER2007159
  9. H. Gu and B. Shulkin, A practical use of humping effect in laser beam welding, Journal of Laser Applications, 23(1) (2011), 012001 https://doi.org/10.2351/1.3538988
  10. K.Kagiya and K. Mori and T. Tarui, Remote laser welding for closure parts, Proceeding of LAMP 2015 conference, (2015), 255
  11. J. Ma, F. Kong, B. Carlson and R. Kovacevic, Two- pass laser welding of galvanized high-strength dual-phase steel for a zero-gap lap joint configuration, Journal of Materials Processing Technology, 213(3) (2013), 495-507 https://doi.org/10.1016/j.jmatprotec.2012.10.019
  12. M. Kang, Y.-N. Ahn and C. Kim, Porosity Reduction during Gas Tungsten Arc-Gas Metal Arc Hybrid Welding of Zinc Coated Steel Sheets (I) - Effect of Preceding Gas Tungsten Arc, J. of Welding and Joining, 34(4) (2016), 40-47 (in Korean)
  13. Y.-N. Ahn and C. Kim, Porosity Reduction during Gas Tungsten Arc-Gas Metal Arc Hybrid Welding of Zinc Coated Steel Sheets (II) - Hybrid Welding Results, J. of Welding and Joining, 34 (4) (2016), 48-54 (in Korean) https://doi.org/10.5781/JWJ.2016.34.4.48