Study of the Effect of K2O, Na2O, MgO, Al2O3 Oxide Additions on Density, Viscosity, Separability and Covering Capacity of CaO-MnO-SiO2 System Slag in Low Carbon Steel Automatic Submerged Arc Welding

The work is aimed at studying the effect of additions of oxides K2O, Na2O, MgO, Al2O3 on slag density and viscosity, as well as the separability and covering capacity of slag of the CaO-MnO-SiO2 system obtained by melting the fused flux during automatic arc welding of low-carbon steels. The subject of research is physicochemical and technological properties of slags, mechanical properties of welded joints obtained as a result of the process of automatic submerged arc welding. It is shown that with an increase in K2O and Na2O content slag density and viscosity, as well as the separability of the slag crust, decrease, and an increase in MgO and Al2O3 content increases slag density and viscosity. Based on results of the work, a composition of the slag base of fused flux is developed on the basis of oremineral raw materials of the Republic of Uzbekistan, selected on the basis of the CaO-MnO-SiO2 ternary system melting diagram. The results obtained make it possible to increase welded joint strength properties by 10-12%.