CN115386873A - Defect repairing method for TA15 titanium alloy part formed by selective laser melting - Google Patents

Abstract

The present application discloses a method for repairing defects of TA15 titanium alloy parts formed by selective laser melting. Size information Excavate the area where the defect is located on the TA15 titanium alloy part to obtain the area to be repaired; fill and repair the area to be repaired on the TA15 titanium alloy part to obtain the repaired TA15 titanium alloy part. The application solves the technical problem in the prior art that repairing defects of TA15 titanium alloy parts by laser selective melting cannot meet actual needs.

Description

A Defect Repair Method for TA15 Titanium Alloy Parts Formed by Laser Selective Melting

technical field

The present application relates to the technical field of material processing, in particular to a method for repairing defects of TA15 titanium alloy parts formed by selective laser melting.

Background technique

With the increasing demand for "lightweight, integrated and high-strength" components of aerospace products, the importance of additive manufacturing technology in the field of aerospace manufacturing has become prominent. Additive manufacturing technology can bring more freedom to the innovative design of product structure, get rid of the constraints of traditional manufacturing technology, realize lightweight structure design, and the whole or part of the whole structure, reduce the manufacturing process, shorten the manufacturing cycle, and significantly improve the quality of raw materials. utilization rate. Laser selective melting technology is an additive manufacturing technology that uses high-energy lasers to melt thin layers of powder layer by layer to form high-density components of arbitrary complex shapes. Due to its high forming precision and high applicability to the manufacture of special complex structures (such as cantilever structures, thin-walled structures, complex curved surfaces, and space lattice structures), it has been widely used in the aerospace field.

TA15 titanium alloy has good heat strength and weldability, especially suitable for manufacturing various welded parts, and is widely used in the aerospace field. Generally, TA15 titanium alloy parts can be processed by laser selective melting technology. However, since laser selective melting is carried out under the protection of inert gas in an inert gas protection cabin, based on the fine powder layer by layer of powder bed, the high-energy laser beam melts the thin layer of powder The process of layer-by-layer fusion accumulation. After the part is formed and taken out of the forming cabin, it cannot be re-spread for deposition and additive. Therefore, for local defects on the surface or near the surface of parts, laser selective melting forming cannot realize in-situ repair of defects, which is different from laser fusion deposition additive manufacturing. That is to say, due to the characteristics of the laser selective melting technology itself, there will be local defects on the surface or near surface of the processed TA15 titanium alloy parts, and the laser selective melting forming technology cannot realize the in-situ repair of the defects.

Contents of the invention

The technical problem solved by this application is: in view of the fact that the defect repair of TA15 titanium alloy parts by laser selective melting cannot meet the actual needs in the prior art, this application provides a method for repairing defects of TA15 titanium alloy parts formed by laser selective melting. In the solution provided in the example, the local defect repair plan for TA15 titanium alloy parts is provided, which can solve the problem that the local defects of TA15 titanium alloy parts cannot be repaired by the original method by selective laser melting, so as to avoid the overall scrap caused by the local defects of the parts.

In the first aspect, the embodiment of the present application provides a method for repairing defects of TA15 titanium alloy parts formed by selective laser melting, the method comprising:

Detect the position information and size information of the defect area in the TA15 titanium alloy part to be repaired by selective laser melting;

Excavating the area where the defect is located on the TA15 titanium alloy part based on the position information and size information to obtain an area to be repaired;

Filling and repairing the area to be repaired on the TA15 titanium alloy part to obtain the repaired TA15 titanium alloy part.

Optionally, based on the position information and size information, the area where the defect is located is excavated on the TA15 titanium alloy part to obtain the area to be repaired, including:

Selecting a filling and repairing method according to preset requirements, and determining the process groove shape of the area to be repaired obtained by excavating and rowing based on the filling and repairing method;

The repaired area is obtained by excavating the area where the defect is located based on the process groove shape, the position information, and the size information.

Optionally, the filling and repairing methods include laser cladding repairing methods and argon arc welding repairing methods;

Determine the groove shape of the excavation process based on the filling and repairing method, including:

If the filling repair method is a laser cladding repair method, the process groove shape of the area to be repaired is V-shaped; or

If the filling and repairing method is argon arc welding repairing method, the process groove shape of the area to be repaired is U-shaped.

Optionally, wherein, for the laser cladding repair method, the opening angle of the process groove is 45°-60°, and the opening of the process groove is upward; or

For the argon arc welding repair method, the opening angle of the U-shaped process groove is 70°-80°. The opening of the U-shaped process groove is upward.

Optionally, it also includes: if the filling repair method includes a laser cladding repair method, setting a laser cladding repair path, wherein the overlapping amount of multiple laser cladding repairs in the laser cladding repair path is a unit One-third to one-half of the laser cladding repair width, and the laser cladding repair path is arranged in a serpentine shape.

Optionally, before filling and repairing the area to be repaired on the TA15 titanium alloy part to obtain the repaired TA15 titanium alloy part, it also includes:

The TA15 titanium alloy parts are pickled, and after the TA15 titanium alloy parts are pickled, the pickling solution remaining on the surface is rinsed with water, and the rinsed TA15 titanium alloy parts are put into an oven for drying process;

Wipe and clean the process groove and the area within the preset range around it.

Optionally, it also includes: detecting whether the repair effect on the area to be repaired meets the preset requirements; if not, re-excavating the area where the defect is located to obtain a new area to be repaired, and performing a new repair on the new area to be repaired. The area to be repaired is filled and repaired until the repair effect meets the preset requirements or the number of excavations reaches the preset threshold.

Optionally, it also includes: performing vacuum heat treatment and annealing on the repaired TA15 titanium alloy parts when detecting that the repairing effect of the process groove meets the preset requirements; Grinding and modifying or removing and supplementary processing the reinforcement on the surface of the area to be repaired.

Optionally, it also includes: filling and repairing the area to be repaired on the TA15 titanium alloy part before obtaining the repaired TA15 titanium alloy part, fixing the TA15 titanium alloy part in a preset inert gas protection cabin , and after the TA15 titanium alloy parts are repaired and completely cooled, the inert gas protection is removed.

Optionally, the wall thickness of the TA15 titanium alloy part corresponding to the defect is not less than 2 mm, and the depth of the defect is less than 7 mm.

Description of drawings

Fig. 1 is a schematic flow chart of a method for repairing defects of a laser selective melting forming TA15 titanium alloy part provided by an embodiment of the present application;

Fig. 2 is a schematic structural view of a V-shaped process groove provided in the embodiment of the present application;

Fig. 3 is a schematic structural diagram of a U-shaped process groove provided by the embodiment of the present application;

Fig. 4 is a schematic flow chart of another method for repairing defects of a TA15 titanium alloy part formed by selective laser melting provided by an embodiment of the present application.

Detailed ways

In the solutions provided by the embodiments of the present application, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

In order to better understand the above technical solutions, the technical solutions of the present application will be described in detail below through the accompanying drawings and specific examples. It should be understood that the embodiments of the present application and the specific features in the examples are detailed descriptions of the technical solutions of the present application, and It is not a limitation to the technical solutions of the present application, and the embodiments of the present application and the technical features in the embodiments can be combined without conflict.

The method for repairing defects of TA15 titanium alloy parts provided by laser selective melting forming provided by the embodiment of the present application will be further described in detail below in conjunction with the accompanying drawings. The specific implementation of the method may include the following steps (the method flow is shown in Figure 1) :

Step 101 , detecting the position information and size information of the region where the defect is located in the TA15 titanium alloy part to be repaired by selective laser melting.

Since the products formed by laser selective melting technology are taken out of the inert gas protection cabin after they are formed, they cannot be powdered again for deposition and additive, so the products formed by laser selective melting technology may have defects, for example, laser There may be defects such as bubbles or cavities on the surface or near the surface of the product formed by melting technology, which will affect the performance of the product.

Further, since the defect may exist on the surface of the product, it may also exist near the surface of the product, in order to repair the defect existing in the product. In the solution provided in the embodiment of this application, it is necessary to excavate the area where the defect is located. For example, use tools such as small milling cutters to excavate the area where the defect is located to ensure that all defects are removed. (see below) as small as possible. In order to accurately excavate the area where the defect is located, the position information and size information of the area where the defect is located must be detected before excavation. Position information such as part wall information of defects on parts formed by laser selective melting technology or the position of defects on the part wall (such as surface or only surface); size information such as depth, length, width or radius of defects, etc. For example, X-ray testing or ultrasonic testing is used to carry out non-destructive testing on the parts where defects occur, and the position and size of the defects are judged according to the test results.

As an example, the wall thickness of the TA15 titanium alloy part corresponding to the defect is not less than 2 mm, and the depth of the defect is less than 7 mm.

It should be understood that although the solution provided in the embodiment of the present application is aimed at explaining the repair process for AT15 titanium alloy parts formed by laser selective melting, as long as the method is used to repair parts or product defects by laser selective melting, it is applicable to this method. The solutions of the application examples are not specifically limited.

Step 102, based on the position information and size information, excavate the area where the defect is located on the TA15 titanium alloy part to obtain the area to be repaired.

In the solution provided by the embodiment of the present application, after determining the location information and size information of the defect area, the defect area on the TA15 titanium alloy part is excavated based on the location information and size information to obtain the area to be repaired.

Further, in the solutions provided in the embodiments of the present application, different filling and repairing methods can be selected for repairing the area to be repaired, wherein the filling and repairing methods are, for example, laser cladding repairing or argon arc welding repairing. As an example, the filling and repairing method is selected according to the resource situation, the structural characteristics of the part or the actual situation of the defect. In order to facilitate the repair, for different filling and repair methods, the groove shape of the excavated area to be repaired is different. That is, the shape of the process groove in the area to be repaired is related to the subsequent filling and repairing method selected.

As an example, a filling and repairing method is selected according to preset requirements, and the process groove shape of the area to be repaired is determined based on the filling and repairing method; based on the process groove shape, the position information and the size information The repaired area is obtained by excavating the area where the defect is located.

As another example, as shown in FIG. 2 , if the filling and repairing method is laser cladding repairing method, the process groove shape of the region to be repaired is V-shaped. As shown in FIG. 3 , if the filling and repairing method is argon arc welding repairing method, the process groove shape of the area to be repaired is U-shaped.

Further, the process groove parameters of the area to be repaired are also different for different filling repair methods. As an example, for the laser cladding repair method, the opening angle of the process groove is 45°～60°, and the process slope The opening of the mouth is upward, wherein upward, for example, refers to the opening of the process groove pointing to the upper surface of the part wall where the defect is located. It should be understood that the specific depth and opening angle of the process groove can be set by those skilled in the art according to the actual size of the defect, the structural characteristics of the location, and the size of the laser cladding single-pass forming, which is not specifically limited in the embodiments of the present application.

As another example, for the argon arc welding repair method, the opening angle of the U-shaped process bevel is 70°-80°, and the opening of the U-shaped process bevel is upward. It should be understood that for repairing by argon arc welding, the process groove formed by excavation and rowing is a near U-shaped process groove, and the specific depth and opening angle of the process groove can be set by those skilled in the art according to actual needs. This is not specifically limited in the embodiments.

Step 103, filling and repairing the area to be repaired on the TA15 titanium alloy part to obtain a repaired TA15 titanium alloy part.

Performing filling and repairing the area to be repaired on the TA15 titanium alloy part to obtain the repaired TA15 titanium alloy part. Since there are many ways to fill and repair the area to be repaired on the TA15 titanium alloy part, and the principles of different filling and repair methods are different, the laser cladding repair method and argon arc welding repair method are used to repair the area to be repaired. The filling repair process is briefly introduced.

1. Laser cladding repair method

For repairing by laser cladding, fix the TA15 titanium alloy parts in a preset inert gas protection cabin, and set the oxygen content in the inert gas protection cabin to not more than 100ppm. Fix the TA15 titanium alloy parts to ensure that the opening of the process groove is perpendicular to the horizontal plane, the opening is upward, and the molten pool formed after the melting of powder spots enters the process groove vertically. Specific laser cladding process parameters such as laser power, powder feeding speed, and scanning speed can be set by those skilled in the art and operators according to actual needs, and are not specifically limited in this embodiment of the present application.

Further, a cladding repair path is set, wherein, in the laser cladding repair path, the overlapping amount of multiple laser cladding repairs is one-third to one-half of the width of a single laser cladding repair, and the laser The cladding repair path is arranged in a serpentine shape.

2. Argon arc welding repair method

For the repair by argon arc welding, it needs to be carried out in an argon-filled box, and TA15 welding wire is used. The specific welding wire diameter, tungsten electrode diameter, welding current and other argon arc welding process parameters can be determined by skilled personnel and operators according to actual needs. setting, which is not specifically limited in this embodiment of the application. In addition, when the filling volume is large (for example, the volume of the area to be repaired is greater than the preset threshold), care should be taken to control heat input. For example, the more common method of controlling heat input is multi-layer welding, which requires the previous layer of weld metal to cool completely Then proceed to the next layer of welding. At the end of repair welding, gradually reduce the welding current to reduce the melting zone. Further, in the argon arc welding repair process, strict inert gas protection is required. And after the argon arc welding repair is completed, keep it in an inert atmosphere until the part is completely cooled.

In the solutions provided in the embodiments of the present application, argon arc welding or laser cladding repair methods can be selected according to the actual situation, so as to improve the effect of the repaired parts.

Referring to Fig. 4, in the scheme provided by the embodiment of the present application, before repairing the area to be repaired, that is, before performing step 103, it also includes step 104: X-ray detection or ultrasonic inspection of the area to be repaired (such as the process groove position) Inspection, to check whether all the original defects are removed, and it is necessary to ensure that the defects are completely removed.

Further, after it is determined that the defect is eliminated, before filling and repairing the area to be repaired corresponding to the defect, it also includes step 105: pickling the TA15 titanium alloy part, and pickling the TA15 titanium alloy part with Rinse the pickling solution remaining on the surface with clean water, and put the rinsed TA15 titanium alloy parts into an oven for drying; and wipe and clean the process groove and the area within the preset range around it .

As an example, parts to be repaired are pickled with hydrofluoric and nitric acids. After pickling, rinse the pickling solution remaining on the surface of the parts with clean water, and put them in an oven for drying. The specific drying time and temperature are determined according to the product conditions, which are not specifically limited in the embodiments of the present application. Before repairing, use anhydrous ethanol to wipe and clean the process groove to be repaired and the surrounding area, and do not touch it directly with hands after cleaning.

Furthermore, in the solution provided by the embodiment of the present application, after the area to be repaired is filled and repaired, the repair effect of the area to be repaired needs to be detected, that is, after step 103 is performed, step 106 is also performed: the repair effect of the area to be repaired to test.

As an example, after the restoration is completed, it is detected whether the restoration effect on the area to be repaired meets a preset requirement. If it is not satisfied, then newly excavate the area where the defect is located to obtain a new area to be repaired, and fill and repair the new area to be repaired until the repair effect meets the preset requirements or the number of times of excavation reaches the preset value. until the threshold is set. For example, excavation and repair can be repeated for parts that do not meet the requirements after repair, but the number of repairs at the same position should not exceed 2 times.

Further, after performing step 106, it is also necessary to perform step 107, post-repair stress relief heat treatment; and perform step 108, perform surface modification treatment of the repaired area. As an example, if the repair effect of the area to be repaired meets the preset requirements, vacuum heat treatment and annealing are performed on the repaired parts. For example, vacuum heat treatment and annealing are put into the furnace within 8 hours after laser cladding repair. And if the repair effect of the area to be repaired meets the preset requirements, the surface reinforcement of the repaired area to be repaired is polished and modified, or the surface reinforcement is removed and supplemented by mechanical processing.

The solution provided in the embodiment of the present application provides a solution for repairing local defects of TA15 titanium alloy parts, which can solve the problem that local defects of TA15 titanium alloy parts cannot be repaired by the original method by selective laser melting.

In order to facilitate the understanding of the effect of the above-mentioned defect repair scheme for TA15 titanium alloy parts, the effect will be described below in the form of an example.

Example one

The repair method provided by this application is used to repair local defects of TA15 titanium alloy parts by laser selective melting. After laser melting and forming of a titanium alloy end frame part, X-ray inspection found that there was a crack defect on the end face. The total length of the crack was about 5mm, and the wall thickness of the structure was 15mm. The method of overwriting is repaired. Compare the X-ray inspection images, excavate the crack defects, and make a trapezoidal process groove with a depth of 5mm and an opening angle of 45°. The opening direction of the repaired process groove must ensure that when the parts are placed, the laser cladding powder can be fed normal incidence. After the process groove is made, X-ray inspection is carried out again to check the internal quality to ensure that all crack defects are eliminated. Pickle the parts, and rinse the residual pickling solution with clean water after pickling. After rinsing, use a high-pressure air gun to blow dry the remaining moisture on the surface, and then dry it in an oven at a temperature of 100°C to 120°C and a drying time of 0.5h. Before laser cladding repair, the process groove to be repaired shall be polished and cleaned, and wiped with white silk cloth dipped in absolute ethanol. After cleaning, it is not allowed to touch the surface of the process groove to be repaired with bare hands. Place the part to be repaired in an inert gas protection cabin, and fix it with the substrate with a fixture to ensure that the laser cladding repair powder can be incident vertically on the process groove. Carry out TA15 powder material preparation, equipment preparation and procedure preparation. Carry out inert gas protection cabin scrubbing to ensure that the oxygen content is less than or equal to 100ppm. Perform TA15 titanium alloy laser cladding repair, laser power 2300w-2500w, spot diameter 2mm, walking speed 10mm/s, shielding gas flow 16L/min-23L/min, offset 1.5mm, single-layer lift 1mm, walking path It reciprocates in a serpentine shape to ensure that the last layer of deposition layer repaired by laser cladding is higher than the surface of the substrate to prevent local size loss after the surface reinforcement is polished and modified. Furthermore, if there is a size defect on the end face of the trapezoidal process bevel groove, the end face can be turned 90°, and the process bevel is made for supplementary cladding repair.

After the repair is completed, the inert gas protection is continued, and the parts are removed from the inert gas protection cabin after they are completely cooled. Use a wire brush to clean the excess on the surface, and perform X-ray inspection on the repaired area. The internal quality inspection meets the internal quality requirements of Class II joints in the "QJ1666A Titanium and Titanium Alloy Fusion Welding Technical Conditions" standard. Then vacuum annealing heat treatment is carried out according to the heat treatment system of the original deposited state of the parts. After vacuum heat treatment and annealing, the repaired surface is polished and modified to smooth the excess height and make a smooth transition with the surrounding base metal. Complete the laser cladding repair work of TA15 titanium alloy parts.

Example two

The repair method provided by this application is used to repair local defects of TA15 titanium alloy parts by laser selective melting. After a certain titanium alloy box part was melted and formed by laser selection, the X-ray inspection found that there was an inclusion defect on the end face. Compared with the X-ray inspection image position, the defect was excavated to form a "U" with a depth of about 4mm and an opening angle of about 70°. ”-shaped craft groove. Pickle the parts, and rinse the residual pickling solution with clean water after pickling. After rinsing, use a high-pressure air gun to blow dry the remaining moisture on the surface, and then dry it in an oven at a temperature of 100°C to 120°C and a drying time of 0.5h. Before argon arc welding repair, the process groove to be repaired shall be polished and cleaned, and wiped with white silk cloth dipped in absolute ethanol. After cleaning, it is not allowed to touch the surface of the process groove to be repaired with bare hands. Due to the large volume of the parts to be repaired, an inert gas protection drag hood is used for inert gas protection. Use appropriate argon arc welding repair welding process parameters, including gas flow, wire diameter, tungsten electrode diameter, and welding current, to fill the process groove with argon arc welding. After the welding is completed, the inert gas protection is continued until the parts are completely cooled. Then carry out X-ray detection on the repaired welding area, check the internal quality of the repaired welding area, and carry out vacuum annealing heat treatment according to the heat treatment system of TA15 titanium alloy parts in the deposited state after meeting the requirements. After vacuum heat treatment and annealing, the repaired surface is polished and modified to smooth the excess height and make a smooth transition with the surrounding base metal. Complete the argon arc welding repair work of TA15 titanium alloy parts.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims (10)

1. A defect repairing method for TA15 titanium alloy parts formed by selective laser melting is characterized by comprising the following steps:

detecting position information and size information of an area where a defect in a TA15 titanium alloy part to be repaired is formed by selective laser melting;

digging and discharging the area where the defect is located on the TA15 titanium alloy part based on the position information and the size information to obtain an area to be repaired;

and filling and repairing the area to be repaired on the TA15 titanium alloy part to obtain the repaired TA15 titanium alloy part.

2. The method of claim 1, wherein the excavating the area of the defect on the TA15 titanium alloy part based on the position information and the size information to obtain an area to be repaired comprises:

selecting a filling repair mode according to a preset requirement, and determining the shape of the process groove of the region to be repaired obtained by digging and arranging on the basis of the filling repair mode;

and excavating and arranging the area where the defect is located based on the shape of the process groove, the position information and the size information to obtain the repair area.

3. The method of claim 2, wherein the filling repair manner comprises a laser cladding repair manner and an argon arc welding repair manner;

determining the shape of the process groove of the row digging based on the filling repair mode, comprising the following steps:

if the filling repair mode is a laser cladding repair mode, the shape of the process groove of the area to be repaired is V-shaped; or

And if the filling repair mode is an argon arc welding repair mode, the shape of the process groove of the area to be repaired is U-shaped.

4. The method of claim 3, wherein,

for the laser cladding repair mode, the opening angle of the process groove is 45-60 degrees, and the opening of the process groove is upward; or

For the argon arc welding repair mode, the opening angle of the U-shaped process groove is 70-80 degrees, and the opening of the U-shaped process groove is upward.

5. The method of claim 4, further comprising:

and if the filling repair mode comprises a laser cladding repair mode, setting a laser cladding repair path, wherein the overlapping quantity of the multiple laser cladding repairs in the laser cladding repair path is one third to one half of the repair width of the single laser cladding repair path, and the laser cladding repair path is distributed in a snake shape.

6. The method according to any one of claims 1 to 5, wherein before the filling and repairing the area to be repaired on the TA15 titanium alloy part to obtain the repaired TA15 titanium alloy part, the method further comprises:

pickling the TA15 titanium alloy part, washing the pickling solution remained on the surface of the TA15 titanium alloy part with clean water after the TA15 titanium alloy part is pickled, and putting the TA15 titanium alloy part after being washed into a drying oven for drying treatment;

and wiping and cleaning the process groove and the area in the preset range around the process groove.

7. The method of claim 6, further comprising:

detecting whether the repairing effect of the area to be repaired meets a preset requirement or not;

and if the defect is not met, newly excavating and discharging the area where the defect is located to obtain a new area to be repaired, and filling and repairing the new area to be repaired until the repairing effect meets the preset requirement or the excavating and discharging times reach a preset threshold value.

8. The method of claim 7, further comprising:

when the repairing effect of the process groove is detected to meet the preset requirement, carrying out vacuum heat treatment annealing on the repaired TA15 titanium alloy part; and

and polishing and modifying the residual height of the surface of the area to be repaired or removing and supplementing the residual height of the surface of the area to be repaired.

9. The method of claim 8, further comprising:

and before the area to be repaired on the TA15 titanium alloy part is filled and repaired to obtain the repaired TA15 titanium alloy part, fixing the TA15 titanium alloy part into a preset inert gas protection cabin, and removing the inert gas protection after the TA15 titanium alloy part is repaired and completely cooled.

10. The method according to any one of claims 1 to 4, wherein,

the thickness of the wall of the TA15 titanium alloy part corresponding to the defect is not less than 2mm, and the depth of the defect is less than 7 mm.

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