SU490611A1 - Electrode for surfacing - Google Patents

Description

The invention relates to electrodes for surfacing wear-resistant alloys on parts of machines operating under conditions of abrasive wear.

A known electrode for surfacing, consisting of a steel rod and a coating containing the following components in weight. %:

60-63

4-6

4-6

3-5

22-25

However, the known electrode does not provide in the weld metal sufficient wear resistance under abrasive wear under the action of loads.

The known electrode also has inadequate welding and technological properties and low manufacturability in the manufacture, which consists in the long-term drying of the compressed electrodes.

In order to increase the wear resistance of the deposited metal and the resistance to its impact loads, nitrided ferrochrome 30-32% was added to the composition of the coating, and the remaining components of the coating were taken in the following weights. %:

Ferrochrome 20-22

Ferrokhrombor14-16

Graphite 14-16

Ferromanganese 10-12

Ferrotitanium8-10

The introduction of nitrated ferrochrome makes it possible to additionally alloy the weld metal with nitrogen. In high carbon surfacing hard alloys, nitrogen is an effective means of grinding the crystallographic structure of the carbide phase, linking a portion of the carbon into carbonitrodes. Nitrogen contributes to the formation of carbides with a high content of carbide-forming elements and, therefore, more wear-resistant.

The resistance to impact loads on the molten metal is increased by increasing the ferromanganese content in the coating, which also increases the stability of the austenite that is formed.

As an electrode rod, 4 mm, the coating thickness is 1.3 mm. The relative weight of the coating to the weight of the electrode rod is 80 ± 5%.

The resulting titrides and carbonitrides are very fine, compact and evenly distributed in the structure of the weld metal. Such a change in the carbide phase contributes to a significant increase in the resistance of the metal to shock load. As a result, the boron content in the weld metal can be reduced by replacing it in part with nitrogen. An increase in ferrotitium allows one more titanium to pass into the deposited metal, and, moreover, titanium sushi changes the nature of its effect on the metal. Titanium performs the functions of energetic deoxidizing agent, almost completely oxidized during the deposition and increasing the transition of the remaining alloying elements from the coating to the weld metal, preventing them from oxidizing with atmospheric oxygen. Since titanium has a high affinity for nitrogen, with complex doping of the weld metal with titanium and nitrogen, nitrides of titanium or titanium carbonitrides are formed, which are finely dispersed and uniformly distributed in the deposition structure. Subject of the Invention Electrode for surfacing, consisting of a steel rod and a coating containing ferrochrome, ferrochromor, graphite, ferromanganese, ferrotitanium, characterized in that, in order to increase the wear resistance of the weld metal and its resistance to impact} 1 load, the nitrodated ferrochrome is introduced into the coating , and the rest of the onerrbi coatings are taken in the following ratio (in weight. Ferrochrome Ferrochromor Graphite Ferromanganese Ferrotitanium Ferrochrome nitrated