SU766797A1 - Composition of eletrode sheathing - Google Patents

Description

 Isolation refers to welding, in particular, to the composition of the electrode coating, mainly for welding copper. Various compositions of electrode coatings for copper welding are known, for example a coating l containing the following components, wt.% MpciMop40 Fluorspar 43 Ferrosilicon3 Ferromanganese 4 Quartz sand 2 Kaolin3 Soda ash 2 The disadvantage of this electrode is the tendency to form pores in the weld, unstable burning arcs and increased spatter of metal electrode. In addition, the multicomponent doping of this electron limits its use for structures operating in various corrosive environments, due to the reduction of the corrosion properties of the weld. The closest in composition to this electrode coating is electrode coating 2, containing the following components, wt%. Marble35-50 Fluor spar 30-50 Refractory compound of zirconium 8-20 (carbide, boride) This electrode coating allows to eliminate a number of the above disadvantages. The introduction of one component (zirconium boride) as a deoxidizing agent increases the corrosion resistance of welds in corrosive media, which makes it possible to expand the field of application of this electrode. In addition, zirconium boride reduces the oxidizing potential of the arc atmosphere, which allows to increase the density of the weld metal and mechanical properties of the welded joint. However, the slag system of these electrodes in combination with zirconium boride causes insufficient separation of the slag crust. Due to the absence of plasticizer components in the coating of these electrodes, there is a difficulty in their manufacture by the method of pressure testing. The purpose of the invention is the possibility of producing an electrode coating by a method of crimping and improving the welding-technological properties of the electrode coating, namely: improving the arc resistance, reducing spattering and improving the separability of the slag crust.

The goal is achieved in that the composition of the electrode coating further comprises feldspar; bentonite and metal oxide selected from the pop group, zirconium, the content of all the above ingredients should be in the following ratios, wt.% Marble 40-50

Fluorspar 30-40 Refractory zirconium compound 8-16

Feldspar2 - 7,

Bentonite2-4

Marble Rest

As a boron oxide, this coating contains boric anhydride in the amount of 1-3%, and as a refractory compound, zirconium contains zirconium carbide and zirconium boride.

The introduction of these components and these data into the electrode coating changes the effective ionization potential, the cathode emissivity and the physicochemical properties of the slag system. These factors make it possible to increase the stability of the arc, reduce spattering and improve the separability of the slag crust. In addition, the introduction of small amounts of bentonite in combination with feldspar improves the coating forming properties of the coating. Feldspar in combination with traditional deoxidizing components (Ti, A1, etc.), previously used in electrode coatings for welding copper, was not used due to an oxidizing effect on the weld metal. In combination with zirconium carbide, which is a high-temperature deoxidizer, its use is possible.

He worked out the proposed elec pojifiioro coating with several of his compositions. Ml wire with a diameter of 4.0 mm was used as electrode rods. Before welding, the electrodes were calcined at 350 ° C for 2 hours. Testing was carried out when welding samples with a thickness of 4.0 mm from copper grade Ml. Welding was carried out with a direct current of reverse polarity with a soldering current of 160-200 A.

In tab. Tables 1 and 3 show the compositions of electrode coatings used in testing and the results of testing of some welding-technological properties that can be quantified.

Table 1

Continued. one

Carbide zir b l and c a

Table

Marble50 41 46 40

Fluke. Spat36 40 33 30

Composition 113

Claims (2)

65 Composition 2 15 Continued table. 4 The rest of the welding-technological properties of electrode coatings (ease of separation of the slag crust, the formation of the weld, etc.) are good. The quality of the coating applied to the rod, evaluated by external inspection, is much better, since plasticizers introduced into the coating make it easier to apply electro-lubricating the masses on the electrode rod, improve the molding of the coating on it. Claim 1. The composition of the electrode coating, mainly for welding copper. containing marble, fluorspar and refractory zirconium compound, characterized in that, in order to improve the welding-technological properties, it additionally contains feldspar, bentonite and metal oxide selected from the group of boron, zirconium,. in the following ratio of components, weight. % Fluor spar 30-40 Refractory zirconium compound 3-16 Feldspar3-7 Oxide methyl, selected from the group of boron, zirconium1- 4 Bentonite2- 4 Marble Else 2. Composition according to claim 1, about ton l and parts and that as boron oxide contains boric anhydride in coli 1-3% of the EU ETS. Sources of information taken into account in the examination of 1.Klchkin Ya.L. Welding of non-ferrous metals and alloys. M. Mashinostroy1964, p. 164. 2. Authors certificate of the USSR 502403, cl. 23 K 35/365, 1975 (prototype) ..