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JWJ > Volume 24(4); 2006 > Article
Journal of KWJS 2006 August;24(4) :22-26.
Published online October 16, 2006.
A Study on CO2 Laser-TIG Hybrid Welding of Zinc-Coated Steel Sheet Part 1: Analysis of Welding Phenomena
Cheol-Hee Kim, Woong-Yong Choi, Hyun-Byung Chae, Jeong-Han Kim, Se-Hun Rhee




Correspondence:   Published online October 16, 2006
ABSTRACT
  In lap welding of zinc-coated steel, porosity formation is one of most significant weld defects, which is caused by zinc vapor generated between the steel sheets. Various solutions have been proposed in the past years but development of more effective method is a worthwhile subject to be investigated. In this study, autogenous laser welding and laser-TIG hybrid welding was applied to the lap welding of zinc-coated steel without gap, and weld pool behaviors were observed by using high speed camera and the porosity generation mechanism was analyzed. The weld defects were successfully eliminated by laser-TIG hybrid welding. This is because the leading TIG arc partially melted the upper sheet and vaporized/oxidized the coated zinc on the lapped surfaces prior to the trailing laser illuminating the specimen.
Keywords: Laser-TIG hybrid welding;CO2 laser;Zinc-coated steel;Porosity
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