SU1738568A1 - Method of producing powder wire - Google Patents

Abstract

Use: in the manufacture of wire, the charge of which includes soot. SUMMARY OF THE INVENTION: A gutter is formed from a metal band. Process the reducing flame of a gas burner. The organic matter is introduced into the plate in solid form. Carbon black is deposited on the inner surface of the ribbon. The gutter is filled with the charge. The method ensures the uniformity of the properties of cored wire and the improvement of its quality. 1 tab.

Description

The invention relates to the production of welding materials - melting electrodes, flux-cored wires.

A known method of manufacturing flux-cored wire, according to which the inner surface of the steel sheath is covered with metal, which is part of the charge.

The disadvantages of the method are a loose filling of the charge with a wire that reduces the filling ratio; the complexity of the uniform mixing of the mixture, which includes carbon in the form of soot; reduction in the quality of the weld metal, due to the heterogeneity of the charge (poor mixing of the charge with soot).

A known method of manufacturing cored wire in which the metal strip is profiled into a groove, is filled with its prepared powdered charge, the groove is rolled into a billet in a forming die, followed by repeated drawing and the resulting

cored wire is heat treated.

The disadvantages of the prototype are the realization that this method does not allow achieving a good compaction of the charge in cases when there are badly miscible materials (for example, soot) in the charge; uneven entry of alloying, deoxidizing fluxing elements of the cored wire into the weld pool during the process of melting the wire due to poor mixing of the components with soot; due to uneven mixing of the charge, the quality of the weld metal is reduced.

The aim of the invention is to improve the quality of the deposited metal during surfacing and welding with flux-cored wires containing carbon black (as deoxidized).

The goal is achieved by the fact that the metal tape in the form of a gutter is pretreated with a reducing flame before filling it with the charge.

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gas burner with the simultaneous introduction into the flame of a gas burner of organic matter in solid form.

The essence of the invention is as follows.

When a metal strip is treated with a reducing flame of a gas burner with the addition of organic matter, soot is deposited on the tape in the form of a thin layer. Thus, the operation of introducing soot into the charge and mixing of the soot with the charge is eliminated. Introducing the soot into the cored wire in the form of a thin layer on a metal tape makes it possible to obtain a uniformity of the properties of the charge of the cored wire. This in turn makes it possible to reliably deoxidize the deposited metal, increasing its quality.

The use of a gas torch improves the quality of the deposited metal by increasing the uniformity of the properties of the charge of the flux-cored wire.

The method is carried out as follows.

After profiling it in the form of a gutter, the metal strip is treated (the inside of the gutter) with a reducing flame of a gas burner with the addition of organic matter in solid form. In the reducing flame, gas, howling of the burner, and in organics there is an excess amount of free carbon, which is deposited on the inner walls of the chute in the form of a thin layer of soot. The use of carbon black in the form of a deoxidizing agent (no need to mix carbon black with the charge) makes it possible to improve the quality of the weld metal, especially when welding and surfacing with a propane-oxygen flame, since this type of welding results in carbon burnout from the weld pool. Therefore, its compensation occurs by introducing carbon black into the cored wire. The soot in the cored wire serves as a deoxidizing agent. Due to the fact that surfacing or welding is carried out on the propane-oxygen mixture with an oxidizing flame, soot is oxidized with an excess of oxygen, contributing to an increase in the temperature of the weld pool. Soot, a thin metal, forms carbon monoxide, which rises to the surface of the welding wire, carries oxides away, and this reduces the amount of non-metallic inclusions in the weld metal, increasing its quality. Soot compensates for the loss of carbon, increases the hardness of the deposited layer.

Example. Make powder

wire of the following composition, wt.%: Ferromanganese14

Ferrotitanium9

Fluorspar21

Aluminum powder5.4

Crealit45

Cadmium boron fluoride4.0

SootEverything Else

as well as cored wire by a known method.

For the manufacture of the wire, a steel tape of 0.8 kp with a size of 0.9 x 16 is used. The metal tape, after its profiling as a groove, is treated (the inner part of the groove) with a reducing flame of a gas torch with a nax number 2 and a nozzle channel diameter 1 3 mm with acetylene consumption of 230-250 m3 / h and with a vinyl plastic rod of 0 3 mm added to the flame of the burner.

The plates are welded to a thickness of mm from steel 20 with a GZU2S torch using an oxygen-propane mixture. logical indicators of the known proposed manufacturing methods. The wire is given in the R table.

As follows from the above data, the proposed method in comparison with the prototype provides improved quality. deposited metal during surfacing using an oopopane-oxygen PM.

Claims (1)

Claims The method of making flux-cored wire, in which metal tape is rolled into a groove and filled with a powdered charge, characterized in that, in order to improve the quality of the weld metal, by ensuring the uniformity of the properties of the flux-cored wire containing carbon in the form of soot carbon, the internal surface of the gutter before filling the mixture is treated with a reducing flame of a gas burner with the simultaneous introduction of g, the flame of organic matter in a solid form.