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JWJ > Volume 31(6); 2013 > Article
Journal of KWJS 2013 December;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
Young-Nam Ahn*, Cheolhee Kim*, Wonbeom Lee**, Jeonhan Kim***
*Welding & Joining Research Group, Korea Institute of Industrial Technology, Incheon 406-840, Korea
**Heat Treatment & Plating Technology Center, Korea Institute of Industrial Technology, Incheon 406-840, Korea
***Korea Ppuri Industry Center, Korea Institute of Industrial Technology, Incheon 406-840, Korea
Correspondence: Cheolhee Kim  Email: chkim@kitech.re.kr
  Published online January 21, 2014
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
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