Proceedings of the KAIS Fall Conference (한국산학기술학회:학술대회논문집)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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The effect of Heat input, Shielding Gas(Ar80% + $CO_2$20%), PWHT on the mechanical properties of HSB600 steel Weldments

HSB600강 용접에서 입열량, 보호가스, 용접후 열처리가 미세조직과 기계적 특성에 미치는 영향

  • Ju, Dong-Hwi (School of Energy.Materials.Chemical, Korea University of Technology and Education) ;
  • Lim, Young-Min (School of Energy.Materials.Chemical, Korea University of Technology and Education) ;
  • Kim, Nam-Hoon (School of Energy.Materials.Chemical, Korea University of Technology and Education) ;
  • Koh, Jin-Hyun (School of Energy.Materials.Chemical, Korea University of Technology and Education)
  • 주동휘 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 임영민 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 김남훈 (한국기술교육대학교 에너지신소재화학공학부) ;
  • 고진현 (한국기술교육대학교 에너지신소재화학공학부)
  • Published : 2011.12.09
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Abstract

The effects of heat input(1.4~3.2kJ/mm), shielding gas(Ar80%+$CO_2$20%) and postweld heat treatment(PWHT, $600^{\circ}C$, 40hr.) on the TMCP HSB600 steel weldments made by GMAW process were investigated. The tensile strength and CVN impact energy of as-welded specimens decreased with increasing heat input. The fine-grained acicular ferrite was mainly formed in the low heat input while polygonal and side plate ferrites were dominated in the high inputs. High performance steel for bridges requires higher performance in tensile and yield strength, toughness, weldability, etc. Thus, the purpose of the experiment is to study HSB 600 in GMAW.

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