WELDING FLUX Russian patent published in 2016 - IPC B23K35/362 

FIELD: metallurgy.

SUBSTANCE: flux contains the following components, wt %: sludge after silicomanganese production 88.0-98.0, dust wastes of aluminium production 1.0-6.0, liquid glass 1.0-6.0. Sludge after silicomanganese production contains, wt %: SiO₂ 25-49, Al₂O₃ 4-28, CaO 15-32, CaF₂ 0.1-1.5, MgO 1.7-9.8 MnO 3-17, FeO 0.1-3.5, S≤0.20, P≤0.05. Dust wastes of aluminium production have the following chemical composition wt %: Al₂O₃ 21-38,27; F 18-27; Na₂O 8-13; K₂O 0.4-6.6, CaO 0.7-2.1; SiO₂ 0.5-2.48; Fe₂O₃ 2.1-2.3; C_total 12.5-27.2, MnO 0.03-0.9, MgO 0.04-0.9, S 0.09-0.46, P 0.1-0.18.

EFFECT: flux use during welding ensures increased level of mechanical properties of welded structures due to decreasing of contamination level of steel by oxide non-metal inclusions by decreasing of FeO concentration in slag, and by carbon deoxidation, as well as increased stability of arc burning, and improved weld quality.