The Paton Welding Journal, 2012, №12



2012 №12 (03)

2012 №12 (05)

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The Paton Welding Journal, 2012, #12, 18-25 pages  

FORMATION OF SPINEL IN MELT OF THE MgO-Al₂O₃-SiO₂-CaF₂ SYSTEM AGGLOMERATED WELDING FLUX AND ITS EFFECT ON VISCOSITY OF SLAG

I.A. Goncharov¹, V.E. Sokolsky², A.O. Davidenko², V.I. Galinich¹ and D.D. Mishchenko¹

¹E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
²Taras Shevchenko National University, Kiev, Ukraine
 
 
Abstract
X-ray examinations of structure of agglomerated flux of the MgO-Al₂O₃-SiO₂-CaF₂ system in solid and molten states evidence that in a temperature range above 1200 °C the Al₂MgO₄ hard spinel phase with a melting temperature of 2105 °C forms in the slag melt. It determines physical-chemical properties of the melt and, in particular, the smooth character of viscosity changes in a temperature range of 1180-1540 °C. By manipulating proportions and concentrations of spinel-forming components Al₂O₃ and MgO, it is possible to achieve the optimal values of the temperature dependence of viscosity of the slag melt and, on this base, develop welding fluxes with predictable technological properties.
 
 
Keywords: welding, agglomerated flux, structure of slag melts, viscosity, diffraction examinations, spinel
 
 
Received:                ??.??.??
Published:               28.12.12
 
 
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