SU466959A1 - Powder Electrode Material - Google Patents

Description

thirty%. The shell in the proposed powder electrode material can be made of steel.

The drawing shows the construction of a tubular electrode based on the proposed material.

The internal diameter of the electrode material is 6 mm, and the filling volume is 85% inside.

The packaging problem was solved with the help of methods of applied topology. The material was produced on a shaker table. Electrode material was deposited calibrating, its cone cones drill bits. The microstructure of the deposited layer shows that it has a high packing density of reinforced grain of the grains, the layer is uniformly strengthened, there are no places with a low concentration of particles.

The high packing density of spherical particles dramatically increased the surfacing and technological properties of the electrode material; no splashing; stabilized process surfacing, no pores.

The proposed design of the electrode material for surfacing composite alloys has allowed to dry up a qualitative leap in increasing wear resistance. An alloy based on spherical particles possesses 5–7 times higher resistance under conditions of intense abrasive wear compared to an alloy based on crushed reelite.

Despite a slight increase in the cost of the proposed construction of the powder electrode material as compared to the applied one, the economic efficiency of the implementation of the present invention is high. It consists of:

- savings due to the increase in manufacturability of surfacing;

-improving the manufacturability of electrodes due to the greater flowability of spherical particles;

- reducing the volume of mechanical machining (grinding) of the weld metal for even reducing the size of the allowance; the allowance is lowered due to a higher quality tip.

The main share of the economic effect is due to the qualitative increase

wear resistance of the built-up metal. The nature of wear of the composite alloy deposited by the electrode material of the proposed design is fundamentally different from the wear of composite alloys containing their irregularly shaped grains. The spherical reinforcing particles wear more evenly (they do not have sharp edges that can be broken out and dye out), and the seizure of an alloy with spherical particles occurs at high specific pressures. This allows, for example, increasing the load on the bit and increasing the penetration.

Subject invention

Claims (1)

1. Powder electrode material, mainly in the form of stick electrodes 0 for wear-resistant surfacing of drill bits with composite alloys, consisting of a metal shell and a mixture in the form of compact grains of a spherical solid alloy material, characterized in that In order to increase the wear resistance of the deposited metal and the filling ratio, the spherical grains are a mixture of large and small particles that are packed in a shell in an amount determined by the following weight ratio: Rk.ch. 77 - 90% m.h 10-23% where Ok.ch - diameter of large particles; 5Lm.h - diameter of small particles, and DK, is 1.3-5.5 /) m. H2. The material according to claim 1, characterized in that, in order to obtain particularly high wear resistance, as a solid alloy 0 take cast Relit. 3. Material according to claim 1, characterized in that, in order to obtain particularly high wear resistance, carbides and borides of transition materials are taken as the hard alloy. 4.Material on PP. 1-3, characterized in that, in order to reduce the dissolution of spherical grains from the hard alloy during the formation of the weld layer, they covered with a protective layer.