2019 №06 (03) DOI of Article
2019 №06 (05)

The Paton Welding Journal 2019 #06
The Paton Welding Journal, 2019, #6, 25-28 pages

Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue #6, 2019 (June)
Pages 25-28

Influence of refractory dispersed phases on physical-chemical properties of slag metls of MgO–Al2O3–SiO2–CaF2 system

I.O. Goncharov1, V.S. Sudavtsova1, D.D. Mishchenko1, A.M. Duchenko1 and V.E. Sokolsky2

1E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail:
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-chemical properties of slag oxide-fluoride melts to develop fluxes with predicted chemical, metallurgical and technological parameters for welding high-strength low-alloyed steels. The addition of MgO into the slag melts of the MgO–Al2O3–SiO2–CaF2 system 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. On the basis of methods of national standard and gravimetric one the procedures for determination of quantitative content of MgO·Al2O3 in liquid and solid slags of the MgO–Al2O3–SiO2–CaF2, system were proposed. 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 Table, 5 Figures.
Keywords: fluxes for electric arc welding, slag melts, refractory dispersed particles, toughness, electric conductivity, thermodynamic activity

Received: 15.04.19
Published: 20.06.19


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