Surfacing equipment method of high Al-Ti type high-temperature nickel base alloy

Abstract

The invention discloses surfacing equipment and method. The surfacing equipment comprises a protective gas hood, a welding gun and a fusion welding power supply, wherein the circumferential periphery of the protective gas hood is provided with a sensing coil so as to heat a workpiece in the protective gas hood by virtue of sensing; the welding gun is connected with the fusion welding power supply so as to carry out plasma fusion welding surfacing on the workpiece; and the lower end of the protective gas hood is connected with gas hood protective gas, so that the protective gas flows from bottom to top in the protective gas hood, and inert atmosphere protection is provided for the workpiece. According to the technical scheme disclosed by the invention, the whole welding line zone has no fissure, and the surface no-damage welding of high Al-Ti type high-temperature nickel base alloy (the sum of Al and Ti contents is more than 6%) can be effectively realized.

Description

technical field [0001] The invention relates to the field of welding technology, and more specifically, relates to a surfacing welding technology for high-aluminum titanium-type nickel-based superalloys. Background technique [0002] Modern high-performance aero-engines and gas turbine hot-end components are mainly made of high-aluminum and titanium (the sum of aluminum + titanium content is greater than 6%) nickel-based superalloys. Because these hot-end components are designed and manufactured with excellent alloys, special and complex cooling structures and good protective coatings, the cost is expensive. On the other hand, these components work in a high temperature, high pressure, corrosive gas environment, and are vulnerable parts, often causing various early damages, such as wear, cracks and ablation. For the fragile gas turbine blades, once damaged, they will lose their use value and need to be replaced. Since these fragile blades are extremely expensive, the cost o...

AI Technical Summary

Problems solved by technology

[0004] Aluminum and titanium are the main precipitation strengthening elements of nickel-based superalloy, which is the material of gas turbine blades. With the increase of aluminum and titanium content, the nickel-based superalloy γ′-Ni 3 The volume percentage of (aluminum, titanium) phase increases and the high temperature strength increases, but the sensitivity to thermal cracks also increases. For nickel-based superalloys with high aluminum and titanium, the main problem to be faced by the fusion welding process is the material. Crack sensitivity is very high. Using ordinary welding technology, the probability of crack occurrence is more than 95%. How to realize the surface damage-free welding treatment of high-aluminum and titanium-nickel-based superalloy materials has always been a key issue for high-aluminum, titanium-nickel-based superalloy blades and Challenges in the manufacture and remanufacturing of hot end components

Images