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Effect of MgO on the Viscous Behavior of CaO-SiO2-Al2O3-MgO Welding Flux System  

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)
Publication Information
Korean Journal of Metals and Materials / v.47, no.2, 2009 , pp. 114-120 More about this Journal
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
welding flux; viscosity; critical temperature; primary phase; FT-IR;
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