Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of MgO on the Viscous Behavior of CaO-SiO2-Al2O3-MgO Welding Flux System

CaO-SiO2-Al2O3-MgO계 용접 플럭스계의 점성에 미치는 MgO의 영향성에 관한 연구

  • Kim, Hyuk (Department of Metallurgical Engineering, Yonsei University) ;
  • Jung, Eun Jin (Department of Metallurgical Engineering, Yonsei University) ;
  • Jeon, Young Duck (Hyundai Steel, Operation Planning Team) ;
  • Min, Dong Joon (Department of Metallurgical Engineering, Yonsei University)
  • 김혁 (연세대학교 공과대학 금속공학과) ;
  • 정은진 (연세대학교 공과대학 금속공학과) ;
  • 전영덕 (현대제철 조업운영팀) ;
  • 민동준 (연세대학교 공과대학 금속공학과)
  • Received : 2008.11.26
  • Published : 2009.02.25
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Abstract

The viscosities of $CaO-SiO_2-Al_2O_3-MgO$ flux were measured under the condition of $CaO/SiO_2=1.0-1.3$ and 5-20 wt%MgO. Submerged arc welding flux with $5wt%Al_2O_3$ content had the lowest critical temperature and widest solid-liquid coexisting region at about 5 wt%MgO. It indicateds that both critical temperature and viscosity depend on the kind of primary phase of molten flux. Viscous behavior of the molten flux at 1773 K was analyzed in the view of silicate structure changed by FT-IR spectroscopy. Based on the critical temperature and the behavior of viscosity at a fixed temperature, it could be proposed that the contents of MgO and $Al_2O_3$ in SAW flux show a pronounced effect on preventing contamination in maintaining the liquid phase flux after welding process.

Keywords

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