| Abstract |
| The viscosities of CaO-SiO2-Al2O3-MgO flux were measured under the condition of CaO/SiO2=1.0-1.3 and 5-20 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 pronounced effect on preventing contamination in maintaining the liquid phase flux after welding process. |
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| Key Words |
| welding flux, viscosity, critical temperature, primary phase, FT-IR |
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