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Information × Registration Number 0221U102387, 0118U000188 , R & D reports Title Investigation of high-temperature physicochemical properties of heterogeneous slag melts and creation of the newest materials and processes of automated electric arc welding of transport infrastructure facilities popup.stage_title Head Halinich Volodymyr I, Registration Date 01-02-2021 Organization E.O.Paton Elektric Welding Institute National Academy of scinces of Ukraine popup.description2  It is proposed to control the processes of interphase interaction at the "slag - metal" interface during submerged arc welding by forming MgO-Al2O3-SiO2-CaF2, CaO-Al2O3-SiO2-CaF2 systems in melts and their subsystems of infusible dispersed phases based on aluminates and silicates of magnesium and calcium. Modeling of thermodynamic properties of melts of MgO-Al2O3-SiO2-CaF2, CaO-Al2O3-SiO2-CaF2 systems and ternary boundary subsystems is performed. It is established that the minimum values of Gibbs mixing energies are achieved in the regions of primary crystallization of infusible compounds, in which the thermodynamic activity of silicon oxide in the slag melt is less than 0.03 molar fractions and which are promising for research in the development of modern agglomerated fluxes for welding bridge structures from weatherresistant steels. The temperature-concentration conditions under which dispersed phases are formed in the melts of the MgO-Al2O3-SiO2-CaF2 slag system are established and it is proposed to control their formation in the technological processes of manufacturing fused and agglomerated fluxes. It is established that the introduction into agglomerated fluxes distensilimanite concentrate Al2SiO5 reduces the thermodynamic activity of oxygen ions in the melt at 1400 oC from 0.05 to 0.03 mol.% and inhibite in 1.2 - 1.7 times the silicon reduction process and oxidation of manganese in the weld metal. It is established that when the content of ZrO2 in the composition of the welding flux to 15% at the interfacial boundary of the slag metal is prevented, the formation of spinels is prevented. The content of iron oxide in the surface layer decreases from 70 to 0.21% and magnesium oxide from 28 to 0.18% and increases the content of zirconium oxide in local microregions on the surface of the slag crust to 82%. It is established that the refining capacity of the technology of fusing by the duplex process method in relation to sulfur is 2-4 times higher, and that of Product Description popup.authors Bogachenko Alexey Goncharov Igor Oleksandrovich Kuzmenko Heorhii V. Sudavtsova Valentina popup.nrat_date 2021-02-01 Close