SU513821A1 - Powder wire - Google Patents

Description

(54) POWDER WIRE

The invention relates to welding. Known flux-cored wire (1) for the surfacing of parts operating under abrasive and impact conditions, consisting of a steel sheath and a mixture containing the following components, in weight. %: Graphite1-2

Molybdenum 3-5

Ferrovanadium 3-6

Metal chrome2-6

Ferroniobium1,5-4

Ferrotitanium1-2

Aluminum2-4.

A disadvantage of the known cored wire is that it does not provide sufficient wear resistance of the weld metal at elevated temperatures.

To increase the wear resistance of the deposited metal at elevated temperatures, the composition of the mixture additionally contains boron carbide and ferrochrome in the following ratio of components, by weight. %:

Graphite2,1-3,2

Boron carbide 0.5-1.5

Ferrochrome 5-14

Ferrovanadium6,5-12

Ferrotitanium 0,5-3

Iron powder 12-20

Steel sheathEverything.

Powder wire consists of a sheath (steel 08 KO) and a charge. The required content of carbon, chromium, boron, vanadium, titanium is provided by the use of such charge components as boron carbide, ferrochrome, ferrovanadium, ferrotitanium and graphite, the amount of which is calculated depending on the chemical composition of the materials used, taking into account the conversion factors

alloyed; their elements in the weld metal. When the initial thickness of the sheath tape was 0.8 and 0.5 mm, the fill factors for the cored wire were 30–32 and 38–40%, respectively.

The composition of the charge varies depending on the method of surfacing (submerged-flux, in protective gases). For example, for mechanized surfacing under the non-oxidizing flux AN-20, the following composition of the charge is required at the initial thickness of the steel strip of 0.8 mm.

at %:

2.2

Graphite 0.8

Boron carbide 6.0

Ferrochrome 6.5 1.0

Ferrovanadium

Ferrotitanium 13.5.

Iron powder

The proposed flux-cored wire can be used for surfacing in carbon dioxide and argon.

For the latter case, for example, flux-cored wire is made from steel tape 0.5 mm thick and the charge of the following

Remaining, in%:

2.5 1.2 Graphite Carbide boron 7.0 Ferrochrome 8.5 Ferrovanadium 2.8 Ferrotitai 18.0. Iron Drug

The metal deposited by powder wire has a martensitic structure with residual austenite and carbides and borides evenly distributed in them.

The increase in the content of vanadium and titanium is associated with the aim of obtaining the weld metal with greater uniformity of grain sizes and evenly; their distribution, weakening its temper brittleness and hardening. Boron is added for increased hardness, which increases the metal hardness to 60- 65 units. HRC.

When tested: x for hydro-abrasive (installation PV-12 of the Institute of VISKHOM) and impact-abrasive (on a laboratory jaw crusher with a complex movement of the movable cheek), wear depends on variations of the charge components within the limits specified in the materials of the application, but the samples showed wear resistance in 1.5-2 times higher than metal deposited with a known wire. It should be noted that the highest wear resistance was obtained QT weld metal, deposited cored wire with the mixture specified in the examples. Welding techno. The logical properties of the cored wire offered (arc burning stability, quality of deposited metal formation, absence of pores and cracks in the metal) are also better than prototype wires -.

Claims (1)

1. Auth. swith № 406680 from 09/26/72 cl. At 23K 35/36.