STUDY OF THE QUALITY OF WELD SEAM OBTAINED BY WELDING WITH BARIUM-STRONTIUM CARBONATITE FLUX

The results of barium-strontium carbonatite application in metallurgy for modifying and refining iron-carbon alloys are generalized. It  is proposed to use bariumstrontium carbonate in welding fluxes manufacturing. BSK-2 barium-strontium modifier produced according to TU1717-001-75073896-2005 by “NPK Metalltekhnoprom” LLC of the following chemical composition: 13.0–19.0%ВаО, 3.5 – 7.5 % SrO, 17.5– 25.5 %СаО, 19.8– 29.8 % SiO₂, 0.7– 1.1 %MgO, 2.5– 3.5 % K₂О, 1.0– 2.0 %  Na₂O, 1.5– 6.5 % Fe₂O₃, 0 – 0.4 % MnO, 1.9–3.9% Аl₂O₃, 0.7–1.1% TiO₂,16.0 -20.0% CO₂ was applied. Technology of manufacturing a flux agent containing 70% of barium-strontium carbonatite and 30% of liquidglass is proposed. Several compositions of welding fluxes based on silicomanganese slag were tested. Flux agent was added in an amount of 1, 3 and 5%. Technological specifications of welding under investigated compositions of welding fluxes are determined. X-ray spectral analysis of chemical composition of the investigated fluxes, slag crusts and weld metal were carried out, as well as metallographic investigations of welded joints. Principle possibility of barium-strontium carbonatite application as refining and gas-protective additive for welding fluxes is shown. Application­ of barium-strontium carbonatite provides reduction of weld metal conta­ mination with nonmetallic inclusions: non-deflecting silicates, 1D oxides and brittle silicates, and also increase desulfurizing ability of welding fluxes. Introduction of barium-strontium carbonatite into fluxbased on silicic and manganese slag in an amount of up to 5% provides ferrite-pearlitic structure of the weld metal of Widmanstatten orientation, while the grain size slightly reduces from no.4 to no.4, no.5.

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