A method for brazing wear-resistant alloys on shock-absorbing bosses of low-pressure rotor blades

Abstract

A method for brazing wear-resistant alloys on shock-absorbing bosses of low-pressure rotor blades, belonging to the technical field of aero-engine component welding, comprising the following steps: Step 1, cleaning before welding; Step 2, powder mixing and preparation; Step 3, presetting paste shape mixture; step 4, brazing wear-resistant alloy; step 5, post-welding processing. By controlling the proportion and uniformity of the brazing material and the cast tungsten carbide powder mixture, the continuity of the shock-absorbing boss brazing wear-resistant alloy is ensured, and the first pass rate and processing efficiency of brazing are improved; the prefabricated amount of the brazing material is improved, The brazed wear-resistant alloy meets the needs of subsequent grinding processing; the method of brushing the working end of the sensor with high-temperature-resistant insulating paint effectively prevents burns on the blade body adjacent to the boss, and the brushed high-temperature-resistant insulating paint does not fall off. Reusable and simplifies guarding operations. The optimization and improvement of brazing process parameters not only improves the brazing quality of wear-resistant alloys, but also reduces the width of the brazing heat-affected zone and meets the design requirements.

Description

technical field [0001] The invention belongs to the technical field of welding of aero-engine components, and in particular relates to a method for brazing wear-resistant alloys on damping bosses of low-pressure rotor blades. Background technique [0002] The low-pressure rotor blades of the aero-engine with shock-absorbing bosses are made of titanium alloy. After the blades are assembled on the rotor disk, the basins of the adjacent blades and the back-facing shock-absorbing bosses are interlocked to reduce the interlocking shock-absorbing bosses when the engine is working. To prevent the wear of the platform, the technology of preparing the wear-resistant layer on the boss is applied. The wear-resistant layer of the shock-absorbing boss of the low-pressure rotor blade is prepared by welding the cast tungsten carbide wear-resistant alloy on the boss by brazing and grinding, and the brazing of the wear-resistant alloy is the most critical. Although the original brazing meth...

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Problems solved by technology

Although the original brazing method can be used to braze the wear-resistant alloy of the shock-absorbing boss of the low-pressure rotor blade, there are still several problems: first, the pass rate of brazing is low, and the main influencing factor is that the surface of the wear-resistant alloy is ground Pores exceed the standard, X-ray inspection wear-resistant layer is discontinuous and subsequent grinding allowance is insufficient; second, there is a lack of reliable and convenient measures to protect the blade body from burns adjacent to the boss; third, the width of the heat-affected zone of the boss is too large, Did not meet the requirements of the new design

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