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Butt Weldability of Shipbuilding Steel AH36 Using Laser-Arc Hybrid Welding

조선용 강판 AH36의 레이저-아크 하이브리드 용접시 맞대기 용접 특성

  • Kim, Jong Do (Division of Marine Engineering, Korea Maritime and Ocean Univ.) ;
  • Myoung, Gi Hoon (Graduate School, Korea Maritime and Ocean Univ.) ;
  • Suh, Jung (Busan Laser Application Support Center, Korea Institute of Machinery & Materials)
  • 김종도 (한국해양대학교 기관공학과) ;
  • 명기훈 (한국해양대학교 기관공학부) ;
  • 서정 (한국기계연구원 부산레이저 기술지원센터)
  • Received : 2016.05.31
  • Accepted : 2016.07.27
  • Published : 2016.10.01

Abstract

The purpose of this study is to improve productivity by implementing one-pass full penetration welding using laser-arc hybrid welding for AH36. On increasing the thickness of the plate, a higher power of laser and arc was required to obtain full penetration. However, increasing the power of heat source caused undercut defects at both ends of the bead. This undercut was prevented by controlling the parameters of welding voltage and pulse correction. Hardness measurement and tensile test were conducted to apprehend the mechanical properties of weld. Also, by carrying out the microstructure observation for laser and arc regions, microstructural properties were understood.

Keywords

Butt Weld;Laser-arc Hybrid Welding;Welding Voltage;Pulse Correction

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