A kind of titanium alloy fan case crack repair welding repair method

Abstract

The invention discloses a method for repairing and repairing cracks in titanium alloy fan casings, which belongs to the technical field of fault repairing for cracks in titanium alloy fan casings. The titanium alloy fan case crack repair welding repair method includes the following steps: determining the area to be repaired, cleaning before welding, polishing the area to be repaired, argon arc welding repair welding, and using an argon arc welding machine to perform argon arc welding on the area to be repaired. After arc welding repair and welding, check the appearance of the repaired weld, grind after welding, grind the repaired weld to a smooth transition, and remove stress by ultrasonic vibration. Use an ultrasonic impact device to repair the weld Frontal impact of welds, fluorescent inspection of repaired welds and X-ray inspection of repaired welds. The titanium alloy fan casing crack repair welding repair method improves the efficiency and quality of weld crack cleaning before repair welding repair, efficiently repairs the titanium alloy fan casing crack fault with high quality, and prolongs the service life of the titanium alloy fan casing. Reduce repair costs.

Description

technical field [0001] The invention relates to the technical field of repairing cracks in titanium alloy fan casings, in particular to a repair welding method for cracks in titanium alloy fan casings. Background technique [0002] Fan one-three stage casing is composed of stator casing, stator inner ring, stator vane, hole probe mounting seat, static pressure joint and other parts, stator casing and stator blade, stator blade and stator inner ring, stator casing The main connection methods with the borescope base and the static pressure nozzle are all connected by welding. Due to the large number of welds and high stress in the casing structure, after one service life, the stator casing will appear Crack faults in the weld seam or blade edge plate at the upper hole detector, the weld crack fault of this part is repaired by an external factory, the parts turnaround time is long, and the repair pass rate is not high, which seriously affects the engine overhaul cycle and repai...

AI Technical Summary

Problems solved by technology

[0002] Fan one-three stage casing is composed of stator casing, stator inner ring, stator vane, hole probe mounting seat, static pressure joint and other parts, stator casing and stator blade, stator blade and stator inner ring, stator casing The main connection methods with the borescope base and the static pressure nozzle are all connected by welding. Due to the large number of welds and high stress in the casing structure, after one service life, the stator casing will appear Crack faults in the weld seam or blade edge plate at the upper hole detector, the weld crack fault of this part is repaired by an external factory, the parts turnaround time is long, and the repair pass rate is not high, which seriously affects the engine overhaul cycle and repair cost

[0003] According to the repair standard, a maximum of 2 repair welding repairs are allowed for the same weld. Since the fan casing repair parts are net-size parts, the assembly structure has high dimensional accuracy and strict technical conditions, the quality of crack cleaning before welding repair affects the quality of welding repair. One of the most critical factors, especially the crack repair welding of titanium alloy materials, is often due to the incomplete cleaning of the crack area before repair welding, so that the repair welding fails or the number of times exceeds the standard, resulting in the scrapping of the repair casing and increasing the repair cost

Before the traditional welding repair, the process of cleaning cracks is generally to grind the weld cracks and remove crack defects. The quality of inspection and cleaning is generally carried out by transporting the parts to the inspection site for X-ray inspection or coloring inspection or fluorescent inspection. If the defects that have not been cleaned are found, Many times of grinding and cleaning and cleaning quality inspection are required. Because the cleaning quality inspection needs to change the site or use testing equipment, the testing procedure is complicated and the efficiency is low. It is extremely inconvenient for on-site repair construction and quality control. Risk of exceeding welding standard welding repair times

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