Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Porosity Reduction in Laser Welding of Nitrided Carbon Steel

질화처리된 저탄소강 레이저 용접부의 기공 감소

  • 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)
  • 안영남 (한국생산기술연구원 용접접합연구그룹) ;
  • 김철희 (한국생산기술연구원 용접접합연구그룹) ;
  • 이원범 (한국생산기술연구원 열표면기술센터) ;
  • 김정한 (한국생산기술연구원 뿌리산업진흥본부)
  • Received : 2013.11.01
  • Accepted : 2013.12.19
  • Published : 2013.12.31
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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.

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References

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