Effect of MgO on the viscous behavior of CaO-SiO2- Al2O3-MgO welding flux system

Hyuk Kim, Eun Jin Jung, Young Duck Jeon, Dong Joon Min

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Abstract

The viscosities of CaO-SiO2- Al2O3-MgO flux were measured under the condition of CaO/SiO2 = 1.0-1.3 and 5.0 wt%MgO. Submerged arc welding flux with 5 wt%Al2O3 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 Al2O3 in SAW flux show a ronounced effect on preventing contamination in maintaining the liquid phase flux after welding process.

Original languageEnglish
Pages (from-to)114-120
Number of pages7
JournalJournal of Korean Institute of Metals and Materials
Volume47
Issue number2
Publication statusPublished - 2009 Feb 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Modelling and Simulation
  • Surfaces, Coatings and Films
  • Metals and Alloys

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