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2019 №06 (03) DOI of Article
10.15407/tpwj2019.06.04
2019 №06 (05)

The Paton Welding Journal 2019 #06
TPWJ, 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: 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-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


References

1. Mysen, B.O. (1988) Structure and properties of silicate melts. Amsterdam, Elsevier.
2. Mills, K.C. (1993) The influence of structure on the physicochemical properties of slags. ISIJ Int., 1, 148-155. https://doi.org/10.2355/isijinternational.33.148
3. Mills, K.C., Yuan, L, Jones, R.T. (2011) Estimation the physical properties of slags. The J. of Southern African Institute of Mining and Metallurgy, 111, 649-658.
4. Zajtzev, A.I., Shakhpazov, E.Kh. (2009) Development of modern theory of metallurgical slags. Metallurg, 5, 27-31 [in Russian].
5. Zajtzev, A.I., Mogutnov, B.M., Shakhpazov, E.Kh. (2008) Physical chemistry of metallurgical slags. Moscow, Interkontakt Nauka [in Russian].
6. Zhuangzhuang Liu, Lieven Pandelaers, Bart Blanpain, Muxing Guo (2018) Viscosity of heterogeneous silicate melts: A Review. Metallurgical and Materials Transact. B, Oct., 49(5), 2469-2486. https://doi.org/10.1007/s11663-018-1374-9
7. Park, J.H. (2007) Solidification structure of CaO-SiO2-MgO-Al2O3(-CaF2) systems and computational phase equilibria: Crystallization of MgAl2O4 spinel. Computer Coupling of Phase Diagrams and Thermochemistry, 31, 428-437. https://doi.org/10.1016/j.calphad.2007.05.005
8. Christensen, N., Chipman, J. (1953) Slag-metal interaction in arc welding. Weld. Res. Counsil Bul. Ser., 15, 18.
9. (1995) Slag Atlas. 2nd Ed. Verlag Stahleisen GmbH, D-Dusseldorf.
10. (1985) Slag Atlas: Refer. Book. Moscow, Metallurgiya [in Russian].
11. Goncharov, I.A., Sokolsky, V.E., Davidenko, A.O. et al. (2012) Formation of spinel in melt of the MgO-Al2O3-SiO2-CaF2 system agglomerated welding flux and its effect on viscosity of slag. The Paton Welding J., 12, 18-25.
12. Goncharov, I.A., Galinich, V.I., Mishchenko, D.D. et al. (2013) Methods of control of silicon oxide activity in slag melts. Ibid., 2, 8-12.
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