Avtomaticheskaya Svarka (Automatic Welding), #12, 2019, pp.52-60
Effect of extrusion modifiers of coating mass on variation of electrode coating thickness
A.Yu. Marchenko1, M.F. Gnatenko2, M.V. Skorina1
E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: firstname.lastname@example.org
WELMA Co. Ltd., 3 Kaunasskaya Str., 02160, Kyiv
The method of oscillographing the signals generated by electromagnetic sensor, through the channel of which the electrodes pass at the outlet of the press coating head, was used to study the effect of extrusion modifiers of the coating mass on thickness variation in manufacture of test electrodes UONI 13/55 of 4 mm diameter. The phenomenon of reduction of coating thickness variations under the effect of modifiers (CMC, alginates, cellulose or soda ash) is explained by that the dose of liquid glass added to the coating gradually increases with the change of the type and increase of the content of modifier. Hydrating of modifying additive particles as a result of absorption of liquid glass moisture leads to thickening of the glass, and of its intergranular layers in the coating mass, and to weakening of Hamaker interaction of filler grains. Probability of generation and accumulation of elastic stresses during extrusion application of the coating on the rods becomes lower. The ability of the coating flow to cover the rods in a uniform concentric layer at pressing of the electrodes becomes higher, accordingly. 6 Ref., 1 Tabl., 11 Fig.
Keywords: coated electrode production, coating mass, coating thickness variation, extrusion modifiers, liquid glass, coating viscosity, electrode quality
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