SU415119A1 - POWDER WIRE FOR SURFACES1 | _ ^ -; ^ _ ^ - "': 1Г1_1 ^:!;. - Google Patents

Description

one

The cored wire is intended for automatic and zero-automatic surfacing with open arcing of pots, painted, shells, delaminations, local impurity, and other defects of machine parts made of medium and high carbon steels, working under the conditions of most carbon and dynamic loads, under conditions of heavy and dynamic loads, for example, under medium and high carbon steels, working, nh under conditions of impact and dynamic loads, under conditions of high carbon steel, working under conditions of general carbon and high-carbon steels, working under the conditions of general carbon and high-carbon steels, working under conditions of general carbon and high-carbon steels, working under the conditions of general carbon and high-carbon steels, working under the conditions of general carbon and high-carbon steels, working under the conditions of general carbon and high-carbon steels, working under conditions of general carbon and high-carbon steels, working under the conditions of general carbon and high-carbon steels. switches, parts of gearboxes of various machines.

Known flux-cored wire for surfacing with a charge containing marble, fluorspar, rutile concentrate, ferrochrome, ferrotitap, iron powder.

The proposed wire differs from the known one in that, in order to weld local surface defects of parts from medium to high carbon steels, ferromolybdea are introduced into the mixture with the following ratio of charge components, wt. %: marble6.0-8.0

fluorspar13.0-17.0

rutile concentrate 12,0-16,0

ferromolybdenum5,0-12,0

ferrochrome2,4-2,8

ferrotitanium14,0-26,0

iron powdery.

Such flux-cored wire provides the hardness of the fused metal according to Brinell with permissible deviations.

350 ± JON. With the proposed wire, local defects can be deposited on the surface of parts and structures of medium-high carbon steel; it has good

welding technology) 1sgva.nn provides excellent formation of the weld metal, stable arc burning with slight spattering, good separation of the slag crust without defects in

deposited layer.

The proposed wire can produce multi-layer welding without removal, which significantly improves performance. Coefficient of deposition

ranging from 13.0 to 29.0 g / a / hour, depending on the magnitude of the welding current. In this case, in 1 hour of machine time, it is possible to melt from 2.0 to 20.0 kg of metal with an insignificant notary of carbon monoxide and spatter from 4.4 to

10.5%. Metallographic studies have shown that there are no chinks, pores and slag inclusions in the surfacing made with this fiber.

The introduction of ferromolnbden reduces the tendency to hot cracks, which provides a fine-grained structure in the weld metal, and a high content of marble reduces the harmful effects of sulfur.

The favorable ratio of the core components of the wire is achieved by introducing ferromolybdenum, ferrochrome and ferrotitanium into the mixture, which increases the strength and plastic characteristics of the cladding metal.

With an optimal composition of the core components of the wire, the mechanical properties of the weld metal have the following characteristics:

temporary resistance Stv 97.2 kgf / mm relative elongation b 12.6%

the relative narrowing i | 5 is 23.4% of the hardness of the molten metal with allowable deviations of 350 ± 50НЬ. The use of the proposed flux-cored wire allows to mechanize and automate the process of repair surfacing, significantly increases labor productivity, provides high quality and wear resistance of the weld metal.

Subject invention

Powder coating for surfacing with a mixture, containing marble, fluorine core, rutne concentrate, ferrochrome, ferrotitanium, iron powder, which is different in that ferromolybdenum is used to charge local surface defects of parts with medium; with the following ratio of the components of the mixture, weight. %:

6.0-8.0 13.0-17.0 at 12.0-16.0

5.0-12.0

2.4-2.8 14.0-26.0 the rest.