Laser cladding restoration method for damage of stator blade of welding assembly of large fan casing of aeroengine

Abstract

The invention relates to a laser cladding restoration method for damage of a stator blade of a welding assembly of a large fan casing of an aeroengine. The method includes the following steps that S1, defect grinding is performed; S2, vacuumizing is performed; S3, a path is planned, wherein a six-shaft manipulator is adopted for planning the path of the complex profile of the ground portion of the blade, and a short-distance Z-shaped cladding path is adopted for path planning; S4, laser cladding is performed, wherein laser cladding is performed on the ground area of a part, the particle size of cladding powder is -100 meshes to +325 meshes, and according to cladding process parameters, the laser cladding power is 300-500 W, the laser spot diameter is 1.0-1.2 mm, the powder feeding amount is 1-2 g/min, the scanning speed is 3-5 mm/s, the layer height is 0.2-0.5 mm/layer, and the overlapping joint rate is 40-60%; S5, manual grinding is performed; and S6, inspection is performed, wherein the restored part is subjected to X ray and fluorescent inspection, if no cracks exist, the repairing requirement is met, and if the cracks still exist, the steps from S1 to S5 are repeated. The laser cladding restoration method has the beneficial effects that the restoration pass percentage reaches up to 95% or above, the repairing cost is low, and the period is short.

Description

technical field [0001] The invention relates to the field of aero-engine maintenance, in particular to a laser cladding repair method for damaged stator blades of a large-scale fan case welding assembly of an aero-engine. Background technique [0002] Aeroengine fan case welding assembly The stator blade is one of the important parts in the compressor, which plays the role of rectifying and diffusing to improve the efficiency of the engine. It has been subjected to airflow for a long time and the risk of being injured by foreign objects, resulting in a high failure rate, and the main damage mode is foreign objects. Since the blade and the casing are welded together, the maximum outer diameter reaches 1000 mm. The material of the stator blade is titanium alloy TC4, and the damage is mainly on the inlet edge of the blade. The inlet edge is a complex space surface structure, and the distance between adjacent blades is less than 50 mm, and the thinnest part of the blade thickne...

AI Technical Summary

Problems solved by technology

Since the blade and the casing are welded together, the maximum outer diameter reaches 1000 mm. The material of the stator blade is titanium alloy TC4, and the damage is mainly on the inlet edge of the blade. The inlet edge is a complex space surface structure, and the distance between adjacent blades is less than 50 mm, and the thinnest part of the blade thickness is about 0.5 mm. Conventional argon arc welding cannot adjust the heat input in real time during the welding process, and it is difficult to realize spatial curved surface welding, and undercutting occurs during the welding process.

For the profiling repair of stator blades with complex spatial curved surface structures, laser cladding technology is mainly used at home and abroad. At present, the repair of compressor blades reported at home and abroad is mainly for the repair of a single blade. There is no public report