SU823045A1 - Powder wire composition - Google Patents

Description

(54) COMPOSITION OF POWDER WIRE

one

This invention relates to welding, specifically to the composition of flux-cored wire.

Various powder dies are known, for example, composition flj, containing the following components, wt.%: Mar0.3-1

Fluorspar 1 -2.5 Ferroniobium 14 -16 Ferrochrome

b -9 Rrafit 1 -2 1 -1.5 G Ferrotitanium 0,2-0,5 Aluminum 1 -2 Rutile

Low carbon steel shell

Rest. The disadvantage of this composition of the vicious wire is that the weld metal has a low ductility.

The powder wire 2 closest in composition, containing the following components, wt.%:

2.5-4 Marble 2 -3.5

Fluorspar

0.3-0.8 Rutile

Aluminum-magnesium0, 3-1.0 eva master alloy Iron pot 0.5-5

0.2-1

Carbon 2 -5

Chrome 4-8

Ferro Tungsten 2.5-5

Ferrovanadium 4-7

Ferromolybdenum 0.05-3

Ferroniobium

Unalloyed

shell steel

Rest.

A disadvantage of the known cored wire is its low workability and high cost.

The purpose of the invention is to improve processability and reduce the cost of cored wire.

five

The goal is achieved by the fact that the composition of the cored wire, consisting of an unalloyed steel sheath and a powdery filler containing fluorspar,

0 marble, rutile, Eschuminium-magnesium ligature, carbon, ferrovanadium, chromium, ferromolybdenum and Ferroniobium, additionally contains nickel and ferrotitanium in the following ratio of components, wt.%:

3-3.5

Marble 6-6,5

Fluorspar 0.8-1.0 Carbon 1-1, Rutile

0 3-4 Ferrovanadium

Ferromolybdenum 8-9

Ferroniobium 0.1-1

Aluminum-magnesium ligature 0.5-0.9

Chrome 4-4.5

Nickel 0.5-0 / 7

Ferrotitanium 2-3

Unalloyed

shell steel Remaining, Reducing the cost of cored wire is achieved by the fact that there is no deficient and expensive ferro-tungsten in the composition of the powder filler. To maintain the required wear resistance of the deposited layer, the content of ferromolybdenum is increased in the filler composition. This makes it possible to obtain a sufficient amount of high-strength molybdenum carbides in the weld metal, which provides the necessary heat resistance to the wear resistance of the weld layer.

The introduction of ferrotitanium contributes to the formation of fine difficult-. soluble carbides, which increases wear resistance at elevated temperatures, increases the viscosity of the deposited layer. In this way, the absence of tungsten in the weld metal is compensated and the high performance characteristics of the tool are maintained. .

The introduction of nickel provides a high heat resistance of the deposited metal and increases its plasticity in the molten state. This reduces the tendency of the metal to form hot cracks and increases the wear resistance of the deposited layer.

Tubular cored wires are made, the compositions of which are shown in the table. For making

flux cored wires use steel strip grade 08 KP with a size of 0.5x15 mm. The cladding is carried out on plates made of steel 45 with a size of 12x mm HBOxZOO in the mode: 300-32 A, and 24-26.V, VH i 18 m / h.

During surfacing, stable melting of flux-cored wire, low spattering of electrode metal, good covering ability and slag separability are observed.

Testing of the tendency of the metal deposited by the cored wire and the known wire to form hot cracks is carried out on an apparatus for bending samples during the welding process. The critical strain rate at which a crack forms in the weld metal is determined.

The critical strain rate for the known wire is 1.05 mm / min, and for the first compound, 2.51 mm / min for the first composition, 2.50 mm / min for the second composition, and 2.55 mm / min for the third composition. the critical strain rate of the proposed wire is more than 2.4 times higher than that of the known one. The metal deposited by the proposed cored wire has, after quenching, a hardness of 62-64 HRC and provides izno- (tool resistance equal to the durability of a tool made of high-speed steel P18.

Thus, the proposed wire has good technological performance and provides the necessary wear resistance of the cutting tool.

Claims (2)

1. USSR author's certificate number 447235, cl. 23 K 35/368, 1973, 2. USSR author's certificate No. 5, 567567, KJi. At 23 K 35/368. 1975 (PROTOTYPE).