| Title |
Effect of MgO on the Viscous Behavior of CaO-SiO2-Al2O3-MgO Welding Flux System |
| Authors |
김혁(Hyuk Kim); 정은진(Eun Jin Jung); 전영덕(Young Duck Jeon); 민동준(Dong Joon Min) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
welding flux; viscosity; critical temperature; primary phase; FT-IR |
| 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. |