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Laser melting rehabilitation method for titanium alloy thin-wall case

A laser cladding, thin-walled shell technology, applied in laser welding equipment, metal processing equipment, heating inorganic powder coating, etc., can solve problems such as flight safety hazards, falling blocks, loose tissue, etc., to achieve quality and pass rate High, easy to operate, small heat affected zone effect

Inactive Publication Date: 2007-05-23
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] Spraying is used to repair the anti-icing shell, and blocks may fall during the use of the engine, which brings hidden dangers to flight safety; using the general laser cladding method, through metallographic inspection, air holes and micro cracks are found in the laser cladding area , loose tissue and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Anti-ice housing

[0019] Material BT20, wall thickness 2mm;

[0020] The wear depth on one side is 0.35mm, and there are 2 wear strips.

[0021] Restoration process:

[0022] a) smooth grinding treatment on the worn area of ​​the part surface;

[0023] b) Cleaning the electro-corrosion layer of the solder and vacuum annealing and dehydrogenation treatment of the solder: temperature 800°C, heat preservation for 50min, and argon gas with a pressure of 0.2MPa and cooling to 80°C;

[0024] c) Laser cladding: cladding frequency f=5Hz, time t=4ms, carried out under argon protection to avoid oxygen absorption and oxidation of titanium alloy during welding, argon gas flow rate Q=5L / min, cladding solder to the filler Full wear and 0.2mm higher, reaching a coverage rate of 45%;

[0025] d) Grinding to the required size and surface roughness.

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Abstract

The invention relates to a method for using laser fusion to repair titanium alloy frame, wherein the inventive method comprises that: smoothing the abrasive area of element surface; cleaning out the solder electrolytic corrosion layer and solder vacuum anneal hydrogen removing treatment; at 750-800Deg. C, for 40-60min, 0.2-0.4MPa, using argon gas to cool down to 80Deg. C, discharging from furnace; laser fusion, while fusion frequency f=5-6Hz, time t=4-5m, under argon gas whose flux Q-4.5-5.5L / min, the fusion solder fills the abrasive part higher than 0.2-0.4mm, to cove 40-75%; abrading to needed size and roughness. The invention has simple operation and high rigidity, without thermal deformation.

Description

technical field [0001] The invention relates to a repair method for a titanium alloy thin-walled shell, specifically, a laser cladding repair method for a titanium alloy thin-walled shell. Background technique [0002] The anti-icing shell is installed on the casing of the low-pressure compressor. Its main function is to supply the air drawn from the seventh stage of the high-pressure compressor to the anti-icing system, heating the fairing and the low-pressure Compressor inlet guide vanes, to prevent ice on the cowling and low-pressure compressor inlet guide vanes, and their working conditions are as follows: [0003] Base material BT20, [0004] Maximum air pressure 5.5kgf / cm 2 , [0005] Maximum air temperature 480°C, [0006] When the engine is working, the casing is fretting and wears in a ring shape. [0007] For the anti-icing shell, it is stipulated in the overhaul guidance that the wear of the φ58 inner ring is not more than φ58.26mm. In the actual repair, mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00B23K26/34B23K26/42C23C24/08
Inventor 杨桂萍李冰雁
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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