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A Study on $CO_2$ Laser-TIG Hybrid Welding of Zinc-Coated Steel Sheet Part 1: Analysis of Welding Phenomena  

Kim, Cheol-Hee (Advanced Joining Technology Team, KITECH)
Choi, Woong-Yong (Digital Media Business, Samsung Electronics)
Chae, Hyun-Byung (Advanced Joining Technology Team, KITECH)
Kim, Jeong-Han (Advanced Joining Technology Team, KITECH)
Rhee, Se-Hun (School of Mechanical Engineering, Hanyang University)
Publication Information
Journal of Welding and Joining / v.24, no.4, 2006 , pp. 22-26 More about this Journal
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; $CO_2$ laser; Zinc-coated steel; Porosity;
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