RU2229368C2 - Electrode coating composition - Google Patents

Abstract

FIELD: processes and equipment for welding constructions of carbon steels. SUBSTANCE: electrode coating contains, mass %:rutile concentrate, 20 - 24; kaolin, 5 - 8; muscovite mica, 4 - 9; silicomanganese, 16 - 18; talc, 14 - 20; marbor, 13 - 16; ilmenite concentrate, 9 - 12 or iron powder 14 - 16; cellulose. 1.5 - 2.0. EFFECT: possibility for making high quality low cost price electrodes due to using suitable raw material, enhanced stability of electric arc. 2 tbl

Description

The invention relates to materials for electric arc welding and can be used as a coating of electrodes for welding structures made of carbon steel.

Known electrode coating (A.S. No. 933336, class B 23 K 35/365, 1982) containing the following components, wt.%:

Ilmenite concentrate 40-50

Marble 6-14

Kaolin 2-6

Iron ore 4-12

Talcum 4-12

Ferromanganese 12-20

Ferrotitanium 4-10

Pulp 1-3

The disadvantage of the electrode is the lack of stability of the arc burning in various spatial positions, which does not allow to form a weld in a vertical and ceiling position. In addition, when welding in installation and repair conditions, where it is not always possible to clean the surfaces to be welded, the use of such electrodes does not provide a high-quality seam.

Known electrode coating (patent No. 2124426, class B 23 K 35/365, 1999), comprising the following components, wt.%:

Ilmenite 35-36

Ferromanganese 14-15

Marble 8-12

Kaolin 9-10

Ferrosilicon 1-2

Cellulose 1.5-2.0

Feldspar 21-24

In addition, the composition may contain up to 8 wt.% Mica.

Closest to the claimed composition is an electrode coating (patent No. 2144427, class B 23 K 35/365, 1999), including the following components, wt.%:

Ilmenite 34-36

Marble 10-12

Mica 6-7

Kaolin 4-5

Field sword 14-16

Silicomanganese 12-13

Iron powder 12-15

Cellulose 1.5-2.0

The objective of the invention is to obtain high-quality welding electrodes with low cost due to the use of available raw materials, as well as increasing the stability of arc burning.

The problem is solved in that the composition of the electrode coating for welding carbon steels, containing kaolin, marble, mica, silicomanganese and cellulose, additionally contains rutile concentrate, talc, as well as ilmenite concentrate or iron powder in the following ratio, wt.%:

Rutile concentrate 20-24

Kaolin 5-8

Muscovite Mica 4-9

Silicomanganese 16-18

Talc 14-20

Marble 13-16

Ilmenite concentrate 9-12

or

Iron powder 14-16

Cellulose 1.5-2.0

The specified number of components made it possible to obtain a high-quality weld in all spatial positions, including along uncleaned surfaces.

To conduct control tests by crimping, electrodes were made from wire Sv 08 with a diameter of 4 mm. Testing of the electrodes was carried out in various spatial positions on alternating current. The test results showed that these electrodes have high welding and technological properties.

The electrodes with the claimed coating composition were used in welding products from low-carbon structural steel and the weld metal was subjected to mechanical tests according to GOST 9466-75, the results of which are presented in Tables 1 and 2. According to the mechanical properties, the deposited metal with the proposed electrode coating composition is of type E -46 (GOST 9467-75) and provides the required values for mechanical properties.

Changing the compositions of the proposed coating in the direction of decreasing or increasing the content of any of its constituent components leads to deterioration of the properties of the electrodes.

Thus, a decrease in the content of rutile less than 20% and ilmenite less than 9% led to a deterioration in the hiding power of the slag and the formation of a weld, and their increase, respectively, more than 24% and 12% led to a significant increase in silicon in the deposited metal.

A decrease in marble content of less than 13% led to a deterioration in gas protection and, as a result, increased the tendency to form pores in the deposited metal, and its increase of more than 16% led to increased spatter.

A decrease in kaolin content of less than 5% worsened the testability of the coating, and an increase of more than 8% led to excessive shortening of the slag and a deterioration in its separability.

A decrease in muscovite mica of less than 4% impaired the stability of arc burning, and an increase of more than 9% worsened the formation of joints. The amount of cellulose used maintained the gas protection necessary to prevent porosity.

A decrease in talc content of less than 14% did not provide the formation of a slag crust uniformly covering the metal, and its increase of more than 20% led to increased spraying.

A decrease in the content of silicomanganese less than 16% did not provide the necessary strength properties of the weld, and its increase of more than 18% led to an unnecessary increase in the strength of the weld.

The introduction of iron powder into the mixture instead of ilmenite increased the plastic properties of the weld and improved the formation of the weld in the lower position.

The use of this composition of the electrode coating in comparison with the prototype will allow you to use cheaper and more affordable raw materials instead of scarce expensive material while maintaining high mechanical properties of the weld.

Claims (1)

The composition of the electrode coating for welding carbon steels containing kaolin, marble, mica, silicomanganese and cellulose, characterized in that it additionally contains rutile concentrate, talc, as well as ilmenite concentrate or iron powder in the following ratio, wt.%: Rutile concentrate 20-24 Kaolin 5-8 Muscovite Mica 4-9 Silicomanganese 16-18 Talc 14-20 Marble 13-16 Ilmenite concentrate 9-12 or Iron powder 14-16 Cellulose 1.5-2.0