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http://dx.doi.org/10.5781/JWJ.2016.34.4.55

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

Ahn, Young-Nam (Joining R&D Group, KITECH)
Kang, Minjung (Joining R&D Group, KITECH)
Kim, Cheolhee (Joining R&D Group, KITECH)
Publication Information
Journal of Welding and Joining / v.34, no.4, 2016 , pp. 55-61 More about this Journal
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
Laser welding; 2-pass welding; No gap; Overlap joint; Galvanized steel; Porosity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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