Automatic Welding, 2017, №01



2017 №01 (06)

DOI of Article 10.15407/as2017.01.07

2017 №01 (08)

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Avtomaticheskaya Svarka (Automatic Welding), #1, 2017, pp. 49-54
 

Nuclear magnetic spectroscopy study of the structure of liquid glasses for welding electrodes

A.E. Marchenko¹, N.V. Skorina¹, M.O. Kiselev¹ and V.V. Trachevsky²

¹E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
²Technical Center of NASU 13 Pokrovskaya Str., 04070, Kiev, Ukraine. E-mail: trachev@imp.kiev.ua
 
Abstract
Nuclear magnetic spectroscopy was used to study the structure of silicon-oxygen anions (SOA) in the composition of monobasic (Li, Na, K) and binary (LiNa, LiK, and NaK) liquid glasses. It is found that combinations of different forms of connection reflect the structure of silicon-oxygen anions present in the solution, which determines the change of liquid glass viscosity, depending on their chemical composition. Structure of SOA of monobasic liquid glasses is determined by the kind of modifier ion. The larger its size, the weaker is its destructive action on SOA, with preservation of a larger number of bridge bonds, ensuring a higher level of liquid glass viscosity. Binary mixtures of liquid glasses at certain ratios of alkali oxide fractions, demonstrate synergism of viscosity. The fraction of bridge bonds is higher in such glasses. Synergic increase of viscosity is more pronounced in LiK glasses than in LiNa and NaK analogs, although viscosity of monobasic glasses, from which the mixtures were prepared, was the same. 11 Ref., 3 Tables, 3 Figures.
 
Keywords: arc welding, welding electrodes, manufacturing technology, liquid glass, liquid glass structure, application of NMR spectroscopy technique
 
Received:                16.02.17
Published:               18.12.16
 
 
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