SU620359A1 - Composition for protecting surface from adhesion of molten metal splash - Google Patents

Description

The invention relates to welding, in particular, to coating compositions for protecting the surface from sticking of molten metal splashes.

Various coating compositions are known, for example, coating ij containing the following components, wt.%: Dextrin 110-20

Mel 60-70

Talc15-20

However, this coating has insufficient wettability, and its use makes it difficult to obtain a dense uniform and durable film. In addition, such a coating is a source of metal corrosion, as the solvent is water. Consequently, when such a coating is applied, the metal is not sufficiently protected from splashes, in addition, additional cleaning of the surface from rust is necessary.

The closest in technical drying and the achieved result to the invention is a coating composition consisting of carbide sludge dissolved in

water With 2j. However, this paste is not technological enough due to the following disadvantages. The coating layer is loose and does not sufficiently protect the surface from splashes; Under the action of an aqueous solution, parts are subjected to corrosion, which leads to welding defects. In addition, when only carbide sludge is used as a filler, the paste is not sufficiently conductive, therefore the arc is excited and does not burn steadily. The coating cannot be applied at a temperature below 0 ° C because the water freezes.

In order to increase the technological properties of the coating, the surface is protected from splashes of molten metal behind. by giving it a frost resistance and ensuring arc stability, the composition of the carbide sludge-based coating additionally contains graphite and glycerin in the following ratio of components, Becv h ,;

Carbide Il2-3

Claims (2)

Glycerin 0.5-1.0 Graphite (p urok) OD 5-0.3, "-.) Pack Carbide sludge represents the equivalent of acetylene, which consists of hydrate. oxide cap Ca (OH) 2 and water. ) / The specific composition of the BbiGiipepf coating, depending on the progress of production. For example, when welding metal sheets with a wall thickness from 16 to target, it was necessary to use composition No. 1, wt. including: Carbide or 3.0 Glycerin1.0 Graphite0.3 When welding metal structures with wall thicknesses from 4 to 12 mm, it is advisable to use the composition No. 2, weight. h ;; Carbide and 2.0 Glycerol 0.5 Graphite 0.15 Coating composition number 1 is applied on samples 200x100x16 of steel Art. 3, T-joint. Manual arc welding of samples was carried out using mm electrodes with direct current c, j °° 22O A from a VDG-lbOl rectifier. The coating composition number 2 was tested on samples 20OOH10OH6 of steel ST. 3, I connection tavrovoe. Electrodes of ANOGZ O 4 mm, current-carrying EV 180 A, Power supply - rectifier VDG-iOpl. The cover was applied evenly with a brush to the sample to be welded on both P ° PO ® and removed by welding and before welding for 15-20 minutes on x-o „„ ,. the air. The coating had good adhesion with heat resistant metal, the arc was excited and burned steadily. The welding of the coated samples was carried out in the open air at a temperature of 10 ° C. After welding, the metal splashes were easily removed from the surface with a brush. The invention The composition of the coating for "protecting the surface from sticking of splashes of molten metal containing carbide sludge, but it is so that the purpose of improving frost resistance and the combustion efficiency of the arc is that it contains graphite and glycerin in the absence of a ratio of components, weight. cg; duCarbide il2-3 GraphiteO, 15-O, 3 Glycerol 0.5-1 Sources of information taken into account during the examination: 1. Author's certificate of the USSR 280209, cl. 23 K 35/365, 1969. 2. Japanese Patent 40-13654, 12 B 1O, 1965.