Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Porosity Reduction during Gas Tungsten Arc-Gas Metal Arc Hybrid Welding of Zinc Coated Steel Sheets (I) - Effect of Preceding Gas Tungsten Arc

GTA-GMA 하이브리드공정에 따른 자동차용 아연도금강판의 용접부 기공감소 (I) - 선행 GTA의 영향

  • 강민정 (한국생산기술연구원 용접접합그룹) ;
  • 안영남 (한국생산기술연구원 용접접합그룹) ;
  • 김철희 (한국생산기술연구원 용접접합그룹)
  • Received : 2016.03.15
  • Accepted : 2016.06.07
  • Published : 2016.08.31
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Abstract

The Zn coating on automotive galvanized steel sheets can improve corrosion resistance. However, the boiling temperature of Zn is lower than the melting temperature of steel and it causes well-known spatter and porosity problem. One of most prominent solutions is a pretreatment of Zn coating by an additional welding arc prior to the main welding process. In this research, GTA and GMA are selected as heat sources for pretreatment and main welding processes, respectively. The authors suggested three possible mechanisms to reduce weld defects by the GTA pretreatment: (1) Formation of gap between the sheets; (2) Evaporation of Zn layer; (3) Oxidation of Zn layer. Among them, Zn Oxidation is the most important mechanism to reduce weld defects in the GTA-GMA hybrid process.

Keywords

References

  1. Welding and Joining Handbook, Ferrous and Non-ferrous alloys, Korean Welding and Joining Soceity, 1 (2008), 287-288 (in Korean)
  2. A. Marder, The metallurgy of zinc-coated steel, Progress in materials science, 45(3) (2000), 191-271 https://doi.org/10.1016/S0079-6425(98)00006-1
  3. S. Dionne, The characterization of continuous hot-dip galvanized and galvannealed steels, JOM, 58(3) (2006), 32-40 https://doi.org/10.1007/s11837-006-0157-y
  4. C. E. Jordan and A. Marder, Morphology development in hot-dip galvanneal coatings, Metallurgical and Materials Transactions A, 25A(5) (1994), 937-947
  5. Y. Nishikawa, T. Suga and T. Nakano, Gas pocket generation in MAG welding of galvanized steel sheet, ISIJ international, 35(10) (1995), 1213-1221 https://doi.org/10.2355/isijinternational.35.1213
  6. S. Izutani, K. Yamazaki and R. Suzuki, New Welding Process, "J-SolutionTM Zn", Suitable for Galvanized Steel in the Automotive Industry, Kobelco Technology Review, 32 (2013), 16-23
  7. 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
  8. 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
  9. S. Kodama, Y. Ishida, S. Furusako, M. Saito and Y. M. T. Nose, Arc Welding Technology for Automotive Steel Sheets, Nippon Steel Technical Report, 103 (2013), 83-90
  10. 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
  11. 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
  12. T. Yih-Fong, Gap-free lap welding of zinc-coated steel using pulsed $CO_2$ laser, The International Journal of Advanced Manufacturing Technology, 29(3-4) (2006), 287-295 https://doi.org/10.1007/s00170-005-2522-3
  13. S. Yang, B. Carlson and R. Kovacevic, Laser welding of high-strength galvanized steels in a gap-free lap joint configuration under different shielding conditions, Welding Journal, 90(1) (2011), 8s-17s
  14. 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
  15. S. Yang and R. Kovacevic, Laser welding of galvanized DP980 steel assisted by the GTAW preheating in a gap-free lap joint configuration, Journal of Laser Applications, 21(3) (2009), 139-148 https://doi.org/10.2351/1.3184432
  16. S. Yang and R. Kovacevic, Welding of galvanized dual-phase 980 steel in a gap-free lap joint configuration, Welding Journal, 88(8) (2009), 168s-178s
  17. J. Ma, F. Kong and R. Kovacevic, Finite-element thermal analysis of laser welding of galvanized high-strength steel in a zero-gap lap joint configuration and its experimental verification, Materials & Design, 36 (2012), 348-358 https://doi.org/10.1016/j.matdes.2011.11.027
  18. 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
  19. 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
  20. H. Matsui, H. Suzuki and M. Yamada, Reduction of blowholes in high-speed arc welding of hot-dip galvanised steel sheets, Welding International, 12(6) (1998), 432-439 https://doi.org/10.1080/09507119809448511