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Journal of KWJS. 2013;31(6):71-76. Published online January 21, 2014.
DOI: https://doi.org/10.5781/KWJS.2013.31.6.71
- Porosity Reduction in Laser Welding of Nitrided Carbon Steel
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Young-Nam Ahn*, Cheolhee Kim*, Wonbeom Lee**, Jeonhan Kim***
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- Corresponding author: Cheolhee Kim ,Email: chkim@kitech.re.kr
- 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
