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http://dx.doi.org/10.5781/KWJS.2013.31.6.71

Porosity Reduction in Laser Welding of Nitrided Carbon Steel  

Ahn, Young-Nam (Welding & Joining Research Group, Korea Institute of Industrial Technology)
Kim, Cheolhee (Welding & Joining Research Group, Korea Institute of Industrial Technology)
Lee, Wonbeom (Heat Treatment & Plating Technology Center, Korea Institute of Industrial Technology)
Kim, Jeonhan (Korea Ppuri Industry Center, Korea Institute of Industrial Technology)
Publication Information
Journal of Welding and Joining / v.31, no.6, 2013 , pp. 71-76 More about this Journal
Abstract
Gas nitriding is a surface hardening process where nitrogen is introduced into the surface of a ferrous alloy. During fusion welding of nitrided carbon steel, the nitride inside weld metal is dissolved and generates nitrogen gas, which causes porosities - blow holes and pits. In this study, several laser welding processes such as weaving welding, two-pass welding, dual beam welding and laser-arc hybrid welding were investigated to elongate the weld pool to enhance nitrogen gas evacuation. The surface pits were successfully eliminated with elongated weld pool. However blowholes inside the weld metal were effective reduced but not fully disappeared.
Keywords
Laser welding; Nitrided steel; Porosity; Laser weaving; Dual beam; Laser arc hybrid welding;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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