SU831466A1 - Electrode coating - Google Patents

Description

(54) ELECTRODE COATING

one

The invention relates to manual arc welding of structures from low carbon steels in all spatial positions at alternating and direct current of reverse polarity.

A number of electrode coatings are known for manual arc welding of low carbon, medium carbon and low alloy steels, the slag forming base of which is rutile concentrate. The electrodes with rutile coatings are most prevalent in our country in manual arc welding of low carbon steels. The share of electrodes with rutile coatings currently makes up about 70% of the total output of electrodes.

Known electrode coating 1, which gives when applied to the wire type CB-08 electrode type E46 and having the following composition, weight ..:

Rutile concentrate 10-50

Talc2--20

Marble4-30

Kaolin2-15

Ferromanganese4-25

Cellulose 1-5

Binding potassium silicate solution 28-30 (by weight

dry charge).

Electrodes with such a coating are manufactured in a large volume. Taking into account the large output of electrodes of only one brand, the question of the partial replacement of expensive scarcity rutile concentrate is very important.

In order to partially replace the scarce rutile concentrate and simultaneously improve the technological properties of the electrodes, a 1-3-kiene-sillimanite concentrate in the amount of 15-25% in the amount of ilmenite concentrate was added to the coating with the following ratio of other components, wt.%: Rutile concentrate 25 -40

Marble18-20

Talc8-12

Ferromanganese14-57

Kaolin 3-5

Cellulose 1.5-2.0

Claims (2)

Commercial sillimanite and ilmenite concentrates are supplied by industry as powders suitable for the manufacture of an electrode coating without additional processing. In order to increase the productivity of welding, iron powder can be added to the composition of the electrode coating in an amount up to 50%. The introduction of a kyanite – sillimanite concentrate in combination with an ilmenite concentrate allows the range of weldable thicknesses and welding currents to be expanded, improves the formation of the weld metal, separates the slag crust, ensures soft burning and arc stability; ruptured arc length increases by 1.5-2 times. All this contributes to improved welding performance. The proposed coating facilitates the formation of a weld metal by introducing a concentrate of kythenic-sillimanite and allows the manufacture of electrodes with a lower content of rutile concentrate in the coating, which is very important because of the scarcity of this component. With this composition, an increase in over-content sillimanite concentrate in the composition of the coating causes excessive slag mobility and it drains from the seam. When testing the proposed coating composition, four compositions were manufactured that have the following component content, wt%: Rutile concentrate28 Ilmenite concentrate 18 Distin-sillimanite and 1.01.02 Talc concentrate 1.0 10.01010 Kaolin 5.0 5.0.05.0 5, 0 Marble 20 20,01818 Ferromanganese 16.5 14,514,516,5 Cellulose 1.5 1.5 1.5 Svayush, its (by weight of dry mHXTbiJ 22-28 Electrode diameters wire brand SV-08 8-6 mm Mechanical performance during testing of samples: b -KRS / mm 38-42; 6 kgf / mm2 46-54; S,% 18-28; a „, kgf / cm 8-15. Chemical analysis of the weld metal deposited when using it is suggested The following coating,%: C 0.08-0.15 Mp 0.5-0.8 Si 0.07-0.18 The test results confirm the possibility of obtaining a coating according to the invention having good technological properties. The coating ensures stable arc burning with constant and alternating current, good formation of the weld and separability of the slag crust, in comparison with the known metal distribution electrodes, improves, the weld metal is molded, finely combed, spattering is insignificant. In addition, the proposed coating reduces the toxicity of the surrounding atmosphere. The proposed coating should be used for welding steel structures during the installation of metal structures. Claim 1. Electrode coating containing rutile concentrate, marble, talc, ferromanganese, kaolin and cellulose, characterized in that, in order to reduce the amount of deficient material in the coating while enhancing its welding and technological properties, the coating additionally contains a stencil-sillimanite concentrate and ilmenite concentrate in the following ratio of components, wt.% Rutile concentrate 25-35 18-20 Marble 8-12 14-17 Ferromanganese 3-5 Kaolin 1.5-2.0 Cellulose Distin-sillimanite and Ilmen concentrate Tovy concentrate 2. The electrode coating according to claim 1, characterized in that, in order to increase the productivity of the welding process, an iron powder up to 50% can be added to its composition. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 450676, cl. At 23 K 35/365, Feb 08, 1973.