Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
권호 표지

Microstructure Evolution of UFG Steel Weld by Hybrid and Laser Welding

하이브리드 용접과 레이저 용접에 의한 세립강 용접부의 미세조직변화에 관한 연구

  • 동현우 (부경대학교 대학원) ;
  • 이목영 (포항산업과학연구원 용접연구센터) ;
  • 안용식 (부경대학교 재료공학부)
  • Received : 2010.02.08
  • Accepted : 2010.04.21
  • Published : 2010.06.30
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Abstract

A laser beam welding and an electric arc welding were combined, and the positive points of each welding method are drawn such as high speed, low thermal load, deep penetration, and high productivity. The fiber laser-MIG conjugated welding. namely the hybrid welding has been studied mainly for the automation industry of a pipeline welding. In this study, the MIG welding was combined with a fiber laser welding to make up the hybrid welding. The weld shapes, microstructures and mechanical properties for weld zones after the hybrid welding or only fiber laser welding were investigated on the 700 MPa grade Ultra Fine Grained(UFG) high strength steel. The amount of acicular ferrite in weld metals and HAZ(heat affected zone) was observed larger after hybrid welding compared with after only laser welding. The Vickers hardness of the top area of the fusion zone after fiber laser welding was higher compared with after hybrid welding.

Keywords

References

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