A wear-resistant and anti-corrosion flux-cored welding wire for tig-p surfacing welding of hydraulic support parts

Abstract

The invention provides a wear-resistant and anti-corrosion flux-cored welding wire for TIG-P surfacing welding of hydraulic support components, which includes a flux core and a sheath wrapped on the outside of the flux core, and the flux core includes the following components in mass fraction, high-carbon chromium Iron 5%‑12%, high nitrogen ferrochrome 2%‑8%, metallic chromium 15%‑26%, silicon additive 1%‑5%, manganese additive 1%‑4%, niobium additive 0.5%‑6 %, molybdenum iron 0.5%‑3%, vanadium iron 0.5%‑3%, copper powder 12‑24%, boron additive 0.5%‑8%, titanium additive 1%‑3%, rare earth additive 1%‑5 %, arc stabilizer 0.5%-3%, and the rest is iron powder, wherein the sum of the mass fractions of each component is 100%. The welding wire of the present invention controls the surfacing metal composition through the composition and content of the powder to promote the generation of small particles of Cu-rich coherent precipitates in the crystal, and the structure of the surfacing alloy is martensite-based matrix structure + a small amount of residual Austenite + precipitation hardening precipitates can effectively improve the hardness and corrosion resistance of the surfacing metal. It is suitable for the surfacing repair of coal mining hydraulic support components that have been in service for a long time under coal gangue impact and coal mine environmental medium corrosion environment.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a wear-resistant and anti-corrosion flux-cored welding wire for TIG-P surfacing welding of hydraulic support parts. Background technique [0002] The hydraulic support for mechanized coal mining is the core component related to the safety of workers and effective operation. Its column piston rod and oil cylinder have been in service for a long time in the harsh environment of coal gangue impact and coal mine environmental medium corrosion. Long-term use is easy to cause surface wear and corrosion invalidated. [0003] Surface modification technologies for key components of hydraulic supports include: electroplating, brazing, spraying, surfacing and other methods. Electroplating hard chromium coating is thin (only 50-70um), environmental pollution is great, and it is basically banned now; brazing and spraying have low bonding force and are easy to fall off; ...

AI Technical Summary

Problems solved by technology

Electroplating hard chromium coating is thin (only 50-70um), environmental pollution is great, and it is basically banned now; brazing and spraying have low bonding force and are easy to fall off; although surfacing welding has high production efficiency and strong bonding force, there is a temperature rise Problems with fast speed, large thermal influence and relatively rough surface

The surface modification technology of powder materials has low efficiency, high equipment cost investment, and low mission; wire arc surfacing technology has low cost and high efficiency, but the thermal deformation caused by welding is large and the surface flatness is low

At present, there is no particularly effective deposition modification technology and alloy to solve this problem, which seriously affects the service life and safety of the hydraulic support. Therefore, it is important to choose an efficient and high-quality surfacing method and develop a high-life cycle surfacing layer material. The key to improving the wear resistance and corrosion resistance of the key components of the hydraulic support has practical significance for improving the life of coal equipment and the development of the entire industry