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2019 №06 (03) DOI of Article
10.15407/as2019.06.04
2019 №06 (05)

Automatic Welding 2019 #06
Avtomaticheskaya Svarka (Automatic Welding), #6, 2019, pp.29-32

Influence of refractory dispersed phases on physico-chemical properties of slag melts of the system MgO-Al2O3-SiO2-CaF2
I.O. Goncharov1, V.S. Sudavtsova1, D.D. Mishchenko1, A.M. Duchenko1, V.E. Sokolsky2
1E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2Taras Shevchenko National University of Kyiv. 60 Volodymyrska Str., 01601, Kyiv, Ukraine

The article is devoted to the study of basic mechanisms of control of structure and physical and chemical properties of slag oxide-fluoride melts in order to create fluxes with predicted chemical, metallurgical and technological parameters for welding high-strength low-alloyed steels. The addition of MgO in the slag melts of the system MgO-Al2O3-SiO2-CaF2 provides an abnormal decrease in the thermodynamic activity of silicon oxide in them due to the formation of a refractory dispersed phase MgO·Al2O3 in the melt. Based on the methods of internal standard and the proposed gravimetric procedure for determination of quantitative content of MgO·Al2O3  in liquid and solid slags of the system MgO-Al2O3-SiO2-CaF2 its optimum content in a slag melt was determined, in which the combination of optimal chemical, metallurgical and technological properties of flux during electric arc welding is provided. 12 Ref., 1 Tabl., 5 Fig.
Keywords: fluxes for electric arc welding, slag melts, refractory dispersed particles, toughness, electric conductivity, thermodynamic activity

Received: 15.04.2019
Published: 20.05.2019

References

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