SU539723A1 - Two-layer electrode coating - Google Patents

Description

(54) DOUBLE-LAYER ELECTRODE COATING

one

The ognosigs ibregenetion to manual electric arc welding of high-alloyed stainless steel steels, for example, OZH23N28MZDZT, 04Kh21N21L 4B, widely used in chemical machine building.

Known in arc welding are electrode coatings in the alcohols of the rutile, rugyl fluorocarcic type, containing gas and slag forming components, deoxidizing agents, alloying elements, stabilizers, plasticizers, etc. l.

Known two-layer electrode coating of fluorocarbon type, containing gas and slag-forming components, stabilizers and plasticizers 2.

However, such a coating, when applied to a high-doped stericil with a large supply of austeniticity, does not ensure the crack resistance of austenitic metal

seams, as well as high mechanical: properties.

The aim of the invention is to increase the grease resistance and mechanical properties of the austenitic metal of the weld.

This is achieved by introducing into the outer cnoii the electrode coating of dispersed particles of refractory compounds (nitride, carbides, borides, or oxides) in an amount of 2-10 wt. % and the rest of the coats of the coatings are selected in the following ratio, weight. /about:

The inner layer with a weight ratio of the coating of 0.35-0.46:

Marble3-24

Titanium dioxide6 - 26

Soda Ash 0.3 - 0.8

Metal Chrome2-15

FluorsparEverything

Naru 1cn layer with a coating weight ratio of 0.1-0.2:

Marble5-15

Titanium dioxide 10-15

Particles of refractory compounds selected from the group of nitrides, carbides, borides, exides 2-10

FluorsparEverything

Additionally, in the inner layer of the coating can be Bodon ferronnobium in the amount of 1-6 wt. %, as well as iron powder - copichene 15-45 weight. %

To evaluate the modifying effect of refractory particles, T1prepared test electrodes made of the St.-O1X23N 28MZDZT wire with a two-layer coating of the composition (see Table 1).

Sodium glass in the amount of 24-26 all was used as a binder in the manufacture of electrodes. % by weight of the charge.

The composition of the charge

Inner layer

Marble

Fluorspar Titanium Dioxide Soda Calcium Chrome metal

Outer layer

Note. The results shown correspond to an average test value of 3-4 samples.

Spirits confirmed the possibility of modifying the addition of particles insoluble in

tsirovanp metal austenitic shvov enter- 55weld bath and possessing small

by dispersed (0.1–1.5 mm) particles by a tu-mismatch

Ho-fusible compounds, for example Tt / V in-At the same time, in the crystallizing metal the outer layer of the coating. The number of cry centers increases. The significant effect of the modification of the steel, because the edges of the particles are

the weld pool melt is developed only by substrates for the formation of XI nuclei by crimping electrodes with a coating weight factor of the inner layer of 0.36, the outer one — 0.12 was calcined at 300 ° C for 2 hours. In the final electrodes, the joints of OH23N28 / ZDZT steel, 20 mm thick, were welded and the microstructure and mechanical properties of the weld metal were evaluated (data are presented in Table 2)

Table 1

Shchitty number

15 63.5

24

39.5

26

6

0.5

0.5 10 15

Claims (2)

Table 2 phases. The introduction of dispersed particles leads to a significant refinement of austential grain, and it is possible to simultaneously improve both the technological properties (cracking and instability) of the metal of austenitic welds, and mechanical properties. Additional addition of ferroniobi to the inner layer of the electrode coating allows to obtain a weld metal that is resistant to intergranular corrosion, and the introduction of iron powder improves the performance of the electrodes with the specified coating. Claim 1. Bilayer electrode coating consisting of an inner layer containing marble, fluorspar, titanium dioxide, soda ash, metallic chromium, and an outer layer containing fluorspar marble, titanium dioxide, characterized in that increase the crack resistance and mechanical properties of a purely austenitic weld metal; the outer layer of the electrode coating additionally contains dispersed particles of refractory compounds selected from nitrides, carbides, borides or oxides, with uyuschem sootnosheshsh coating components, by weight. %: a) - inner layer with a coating ratio of 0.35-0.46: Marble3-24 Titanium dioxide6-26 Soda calcinated 0.3-0.8 Metallic chromium2-15 Fluorspieces b) outer layer with a coating weight ratio of 0, 1-0.2: Marble5-15 Titanium dioxide 1О-15 Particles of refractory compounds selected from the group nitrides, borides,. oxides 2-10 Fluor swordsEndal 2, Coating according to claim, 1, about t and h with it so that, in order to achieve a steady gel resistance: the corrosion resistance, the inner layer additionally contains 1-6 by weight of ferronobi and 15 -4-5 weight. i iron powder. Sources of information taken into account in the examination: 1.Davydenko I.D. Reference on welding electrodes, 1961, Rostov lower publishing house, p. 64-70. 2. Japanese Patent Hd 25973, cl. 12B 105.3.ot 08/27/70.