Surfacing welding strip with excellent heat fatigue resistance

Abstract

The invention discloses a surfacing welding strip with excellent heat fatigue resistance. The surfacing welding strip is composed of a welding core and two layers of coatings, wherein the first layerof coating is fabricated by the following ingredients of , by weight, 18-26 parts of high carbon ferromanganese, 10-14 parts of carbon ferrochrome, 7-9 parts of magnet, 1-3 parts of hydroxyapatite, 2-5 parts of strontianite and 3-6 parts of aedelforsite, and the second layer of coating is fabricated by the following ingredients of , by weight, 15-20 parts of titanium oxide, 10-13 parts of ferrotitanium, 2-4 parts of silicon nitride, 5-7 parts of molybdenum carbide and 1-3 parts of tungsten disulfide nanotubes. By means of the surfacing welding strip with the excellent heat fatigue resistance,the fabricated welding strip can work in a high-temperature corrosion or high-temperature wear medium for a long time and can maintain excellent cold and heat fatigue resistance and good high-temperature performance of high-temperature oxidation resistance, high-temperature corrosion resistance, high-temperature tempering stability, red hardness and the like, in the working process, electric arc burns stably, arc breaking is not prone to appear, almost no slag is remained on the surface of weld metal, less dust and smoke are generated, and the surfacing welding strip with the excellent heat fatigue resistance has wide applicability.

Description

technical field [0001] The invention belongs to the technical field of welding rod processing, and in particular relates to a surfacing welding rod with excellent thermal fatigue resistance. Background technique [0002] Overlay welding is a welding process that deposits a layer of wear-resistant, corrosion-resistant, heat-resistant metal layers on the surface or edge of the workpiece. Overlay welding has significant economic benefits for improving the service life of parts, rationally using materials, improving product performance and reducing costs. At present, the types of wear-resistant and heat-resistant surfacing materials that have been developed at home and abroad are mainly divided into three types: cobalt-based wear-resistant and heat-resistant surfacing materials, nickel-based wear-resistant and heat-resistant surfacing materials and iron-based wear-resistant and heat-resistant surfacing materials. kind. Among them, cobalt-based wear-resistant and heat-resistant...

AI Technical Summary

Problems solved by technology

Among them, cobalt-based wear-resistant and heat-resistant surfacing materials and nickel-based wear-resistant and heat-resistant surfacing materials are greatly limited because of their high price, while ordinary iron-based wear-resistant and heat-resistant surfacing materials will Due to the instability of the structure, the mechanical properties of the alloy are reduced. Although an oxide film with high cohesive force is formed on the surface of the alloy, the matrix of the alloy is easy to shear due to the decrease in shear strength at high temperature, so that both the oxide film and the base metal are easy to shear. wear and tear

Moreover, because there are many alloy elements added in the coating, the molten slag is brittle. When the welding is stopped and cooled, the slag often bursts and splashes in flake-like small pieces, which is easy to burn the eyes and facial skin of the staff. The smoke and dust are large during welding. Environmental problems such as a lot of gas harmful to human health, difficult to remove slag after welding, seriously affecting the quality of weld metal