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Titanium alloy thin-wall part surface crack repairing method

A technology of surface crack and repair method, applied in the direction of metal material coating process, coating, etc., can solve the problems of complex heat treatment process, curling burn-through, poor feasibility and other problems, achieve small deformation, accelerated cooling and cooling, thermal influence small area effect

Active Publication Date: 2022-05-06
国营四达机械制造公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Based on the above background technology, aiming at the repair requirements of titanium alloy thin-walled parts with a thickness of 0.5 mm to 0.7 mm, in order to overcome the poor feasibility of existing repair technologies, burn-through during arc start, large thermal stress after welding, and complicated post-weld heat treatment process defect

Method used

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  • Titanium alloy thin-wall part surface crack repairing method
  • Titanium alloy thin-wall part surface crack repairing method

Examples

Experimental program
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Embodiment 1

[0057] This embodiment is a method for repairing surface cracks of titanium alloy thin-walled parts. figure 1 , using the combination of laser cladding and DC argon arc welding technology, strictly control the process parameters to ensure the integrity of the matrix structure and the stability of the repair quality, and restore the flatness and smoothness of the repair surface through grinding wheel grinding, combined with non-destructive testing methods to detect cracks , lack of fusion and other defects, the specific steps are as follows:

[0058] Step 1: Pre-weld treatment

[0059] 1.1 Use a grinding wheel to polish the coating and oxide layer on the surface of the titanium alloy skin until the metallic luster is exposed, and find all cracks on the surface of the titanium alloy skin. For cracks that penetrate the wall thickness of the titanium alloy, the titanium alloy where the crack is located should also be The coating and oxide layer on and around the back of the alloy...

Embodiment 2

[0085] This embodiment is a method for repairing surface cracks of titanium alloy thin-walled parts, and the specific steps are as follows:

[0086] Step 1: Pre-weld treatment

[0087] This step is the same as Step 1 in Example 1.

[0088] Step 2: Laser Cladding Repair

[0089] 2.1 Select TC4 titanium alloy powder with a particle size of 75 μm to 125 μm for drying treatment. The drying temperature is 135° C., the drying time is 4 hours, and the vacuum degree is -1 bar.

[0090] 2.2 Determine the repair path

[0091] According to the width and depth of the groove opened by the crack, the number of laser cladding passes and layers are set to 7 and 8 layers, respectively, until the surface of the cladding layer is higher than the surface of the titanium alloy skin, reducing the heat input at the same time Ensure sufficient machining allowance.

[0092] 2.3 Laser cladding

[0093] 2.3.1 Preheating before repair:

[0094] In order to reduce the initiation of cracks and ensure...

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Abstract

Aiming at the repair requirement of a titanium alloy thin-wall part with the thickness of 0.5 mm-0. 7mm, the invention aims to overcome the defects that the existing repair technology is poor in feasibility, the turned edge is burnt through during arcing, the thermal stress after fusion welding is large and the post-weld heat treatment process is complicated. According to the method for repairing the surface cracks of the titanium alloy thin-wall part, in consideration of laser heat concentration of laser cladding, a titanium alloy skin cannot be curled and burnt through when low-power laser cladding is adopted. But low power cannot fully melt titanium alloy powder, a laser cladding technology and a direct current argon arc welding technology are combined, on the basis that the titanium alloy powder is cladded through argon arc welding, the titanium alloy powder is further melted and filled, repairing of cracks on the surface of the ventral fin titanium alloy skin is achieved, the repairing efficiency is improved, and the quality of a cladding layer is guaranteed; the repairing cost is reduced, the aerodynamic shape of the ventral fin structure is recovered, the peripheral area is not damaged, the structural bearing capacity is guaranteed, and the bottleneck problem of repairing cracks on the surface of the ventral fin titanium alloy skin is solved.

Description

technical field [0001] The invention relates to a method for repairing cracks on the surface of titanium alloy thin-walled parts. The method combines laser cladding technology and argon arc welding technology to realize the titanium alloy skin surface of 0.5mm-0.7mm thick titanium alloy thin-walled parts of aviation aircraft. Repair of crack faults. Background technique [0002] During the overhaul process of a certain type of aircraft, it was found that there were many cracks at the connection between the surface of the pelvic fin titanium alloy skin and the internal reinforcing rib, ranging in length from 17cm to 25cm, extending along the connection between the surface titanium alloy skin and the reinforcing rib, and The crack fault damage is deep and has penetrated the second layer, which seriously endangers the safety of the aircraft. If it is directly repaired by replacing a new product, the maintenance cost is too high, and the pelvic fin is scrapped due to crack fail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/04C23C24/10
CPCB23P6/04C23C24/106Y02P10/25
Inventor 黄婷婷武德安赵静符素宁李晓玄康凯
Owner 国营四达机械制造公司
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