CN114406605A - Friction stir welding repairing method for threaded hole - Google Patents
Friction stir welding repairing method for threaded hole Download PDFInfo
- Publication number
- CN114406605A CN114406605A CN202111396248.0A CN202111396248A CN114406605A CN 114406605 A CN114406605 A CN 114406605A CN 202111396248 A CN202111396248 A CN 202111396248A CN 114406605 A CN114406605 A CN 114406605A
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- threaded hole
- repaired
- friction stir
- stir welding
- stirring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/1215—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding for other purposes than joining, e.g. built-up welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
Abstract
The invention provides a friction stir welding and mechanical self-locking repair method for a threaded hole, and aims to improve the repair quality and repair efficiency of the threaded hole. According to the invention, the groove is processed in the threaded hole to be repaired, so that the mechanical self-locking is generated while the metallurgical bonding between the filling material and the area to be repaired is realized, and the bearing capacity of the repaired threaded hole is improved through the double functions of the mechanical self-locking and the metallurgical bonding. The adopted filling material is in a ring shape, so that the repairing efficiency is improved, and the rigidity requirement of used equipment is reduced.
Description
Technical Field
The invention relates to a friction stir welding repair method for a threaded hole.
Background
The threaded connection is a widely used and detachable connection method, has the advantages of simple structure, reliable connection, convenient assembly and disassembly and the like, and is commonly used for connection between metal and between metal and nonmetal. In the service process of the component, under the action of complex alternating load, the thread connection part has abrasion defects such as thread falling, hole wall collapse and the like, and the defects can seriously affect the bearing performance of the component. Threaded holes are usually machined in component bodies, and the serious abrasion of the threaded holes can cause the whole component to be scrapped, so that resources are wasted, and the cost is increased. Therefore, the wear defect of the threaded hole needs to be repaired in time, the service life of the whole component is prolonged, and the aims of saving resources and reducing cost are fulfilled. At present, the threaded hole is repaired by fusion welding and friction stir welding mainly based on a welding method.
The fusion welding repair method is to perform additive repair on a defective part of a threaded hole by using a welding wire, then perform tapping treatment by using a screw tap, and further obtain a brand new threaded hole meeting the size requirement, such as the schemes described in patent documents with publication numbers of CN108907374A, CN107030447A, CN106475734A and CN 106002081A. However, repairing a threaded hole by conventional fusion welding has the following disadvantages: firstly, the defects of air holes and slag inclusion are easily generated in the melting welding process, so that the repaired threaded hole has the risk of poor local bearing performance; secondly, high temperature generated in the melting and welding process enables the near threaded hole and the repair threaded hole to easily generate coarse grain structures, and further mechanical properties of the threaded hole are reduced; finally, due to size limitations, the welding wire cannot act on the threaded hole repair area, resulting in a repair failure.
The invention patent CN110640295A discloses a stirring head and a method for repairing friction stir welding of a threaded hole. According to the method, the filling material is added into the threaded hole to be repaired, then the stirring head rotating at a high speed is adopted for rolling, the filling material is extruded to the worn defect area of the threaded hole, the filling material and the area to be repaired are metallurgically combined, and the purpose of repairing is achieved. Compared with the traditional fusion welding repair method, the method improves the repair quality of the threaded hole. However, since the process parameters have a great influence on the metallurgical bonding degree between the filling material and the region to be repaired, it is challenging to ensure that the filling material and the region to be repaired are effectively metallurgically bonded. When the process parameters such as the rotating speed of the stirring head, the welding speed, the radial pressure of the stirring needle and the like are selected unreasonably, the metallurgical bonding is insufficient, once the metallurgical bonding is insufficient, only the defect of insufficient metallurgical bonding can be left in the repair area, and the performance of the repair area is rapidly deteriorated under the condition of stress. Secondly, the cylindrical filling material used in patent CN110640295A puts higher requirements on the rigidity of the repair equipment, so that the realizability of repairing the threaded hole is difficult. Finally, in order to fully plasticize surrounding metal and extend the screwer, the repair in patent CN110640295A requires a retention time of 1-300s, if the retention time is not long enough, the metal surrounding the screwer is not softened, and the screwer cannot extend out under the action of manpower, so that the thread machining capability cannot be realized, but the repair efficiency of the threaded hole is reduced due to the long retention time.
Disclosure of Invention
In view of the defects of the conventional threaded hole repairing method, the invention provides a friction stir welding and mechanical self-locking repairing method for a threaded hole, so that the mechanical self-locking is generated while metallurgical bonding is realized between a filling material and a to-be-repaired area, and the bearing capacity of the repaired threaded hole is improved through the dual functions of the mechanical self-locking and the metallurgical bonding. Meanwhile, the rigidity requirement of the repairing device is low, so that the difficulty in repairing the threaded hole is reduced, and the repairing efficiency of the threaded hole can be obviously improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the friction stir welding repair method for the threaded hole is characterized by comprising the following steps of:
step one, pretreatment processing
Uniformly processing 2-4 extrudable filling materials along the circumferential direction of the threaded hole to be repaired to form a mechanically interlocked groove, cleaning the threaded hole to be repaired after processing until the threaded hole to be repaired presents a uniform metal color, and cleaning the threaded hole to be repaired by using an organic solvent;
step two, clamping the workpiece with the threaded hole to be repaired and the stirring head
Clamping the threaded hole to be repaired on a clamping platform of a friction stir welding machine;
selecting a stirring head with corresponding specification and size according to the specification and size of the threaded hole to be repaired, mounting the stirring head on a main shaft of a friction stir welding machine, and enabling a stirring pin of the stirring head to be coaxial with the threaded hole to be repaired;
step three, manufacturing and placing filling materials
Selecting a material with the same material as the threaded hole to be repaired to prepare a circular ring-shaped filling material, wherein the height of the filling material is equal to the depth of the threaded hole to be repaired, and then heating the prepared filling material to the temperature of 100-800 ℃ and then placing the filling material in the threaded hole to be repaired;
step four, stirring and repairing
Starting a friction stir welding machine, enabling a stirring head to rotate at the speed of 100 plus 10000rpm and move downwards at the speed of 0.1-10mm/min, rolling a stirring pin of the stirring head downwards into a threaded hole to be repaired and contacting with the inner diameter of a filling material to generate heat by friction, stopping the rolling movement when the lower end face of the stirring pin contacts with the bottom of the threaded hole to be repaired, continuously keeping the rotation movement for 1-10s, and then drawing back the stirring head at the speed of 0.1-10mm/min until the stirring pin leaves the threaded hole to be repaired to obtain a smooth-walled cylindrical hole;
step five, tapping
And when the smooth-wall cylindrical hole is cooled to room temperature, tapping the smooth-wall cylindrical hole by adopting screw taps of corresponding models according to the actual size requirement of the threaded hole to be repaired to obtain the repaired threaded hole.
Further, the groove processed in the first step is a T-shaped groove, an L-shaped groove, an I-shaped groove or an S-shaped groove.
Further, the structure and the size of each groove processed in the step one are the same.
Further, the groove processed in the first step is a T-shaped groove, and the size of the T-shaped groove is as follows: a is 1-8mm, B is 2-10mm, C is 4-20 mm; a is the height of the transverse part and the width of the vertical part of the T-shaped groove, B is the height of the vertical part of the T-shaped groove, and C is the length of the transverse part of the T-shaped groove.
Furthermore, the outer diameter of the ring-shaped filling material manufactured in the third step is 0-1mm smaller than the inner diameter of the threaded hole to be repaired, and the inner diameter of the ring-shaped filling material is 2-4mm smaller than the outer diameter of the threaded hole to be repaired.
And further, the stirring head adopted in the second step is made of high-temperature alloy, and the rigidity and the wear resistance of the stirring head are superior to those of the threaded hole material to be repaired.
Further, the ratio of the shaft shoulder diameter of the stirring head to the diameter of the stirring needle adopted in the second step is 2:1-10: 1.
And further, the diameter of the stirring pin adopted in the second step is equal to the inner diameter of the threaded hole to be repaired, and the diameter of the end part of the stirring pin after the arc chamfering is 0.1-0.5mm smaller than the inner diameter of the annular filling material.
The invention has the beneficial effects that:
1. according to the invention, the T-shaped groove is processed on the threaded hole to be repaired, in the repairing process, the filling material is heated to reach a plastic state, the plasticized metal is extruded to the T-shaped groove by the radial pressure of the stirring needle, and mechanical self-locking is formed between the filling material and the threaded hole to be repaired. Compared with the method for repairing the threaded hole only by means of metallurgical bonding in the invention patent CN110640295A, the repair quality of the threaded hole is further improved by the aid of the dual functions of metallurgical bonding and mechanical self-locking. In addition, the filling material adopted in the invention is circular ring-shaped, and has the advantages compared with the cylindrical filling material used in the invention patent CN 110640295A: (1) the resistance of the stirring head in the rolling process can be greatly reduced, and the axial acting force of the friction stir welding machine is reduced. (2) The material is saved; conventional thread wear is that extremely individual threads are worn, not all threads are worn, and therefore, the area of an actually repaired area is small; the annular filling material is used, so that the repair efficiency is improved and the rigidity requirement of used equipment can be reduced on the premise of repairing the thread.
2. When the parameters are not reasonable, the invention patent CN110640295A has the defects of insufficient metallurgical bonding and can only leave the defects in the repair area, and the performance of the repair area is rapidly deteriorated under the condition of stress. In the invention, when the process parameters are unreasonable, the metallurgical bonding is insufficient, but mechanical self-locking can be generated, so that under the condition of stress, the mechanical self-locking can enhance the bearing capacity of the existing area with insufficient metallurgical bonding, which can not be realized by the invention patent CN 110640295A. Therefore, under the condition of meeting the bearing performance of the repair area, the repair process parameter window of the invention is larger than that of the invention patent CN 110640295A. 3. Compared with the repair retention time of 1-300s in the invention patent CN110640295A, the repair retention time of the invention patent is only 1-10s, thereby remarkably improving the repair efficiency.
4. The invention has high realizability. Even if the material stays in CN110640295A for a long time (for example, close to 300s), the material can only be heated to a plastic state instead of a molten state because the property of friction welding belongs to a solid phase. In the plastic state, the surrounding plastic metal still exerts a pressure on the pin, so that the screwer cannot be opened at the pin end with a substantial effort. If the stirring pin is surrounded by molten metal material, it is only possible to manually open the screwer. Thus, the realizability of CN110640295A is much smaller than that of the present invention.
5. The stirring pin adopted by the invention has a smooth surface, is beneficial to improving the smoothness of a repaired area, can carry out tapping treatment without secondary processing, and improves the repairing efficiency.
6. According to the invention, all the grooves formed in the threaded holes to be repaired have the same structure and size, so that when a milling cutter is used for machining the grooves, only one cutter is used, the cutter does not need to be replaced during machining, and the machining efficiency is improved; besides, the grooves with the same size can ensure that the filling materials extruded into the grooves in the repair process are as much as possible, namely, the same mechanical interlocking purpose is achieved, and the interlocking effect is ensured.
7. The method repairs the threaded hole by using a solid-phase friction stir welding method, avoids the generation of defects such as air holes, slag inclusion, coarse grains, thermal cracks and the like, and is favorable for improving the quality of repairing the threaded hole.
8. According to the invention, the friction between the stirring needle and the filling material generates heat, and the repaired inner wall area close to the threaded hole is a fine dynamic recrystallization structure under the action of thermal coupling, so that the mechanical property of the repaired area is improved.
Drawings
Fig. 1 is a schematic view of a T-shaped groove machined in a threaded hole to be repaired according to the invention.
FIG. 2 is a schematic diagram of the present invention after placing a ring-shaped filler material in the threaded hole to be repaired.
FIG. 3 is a schematic view of a stirring head used in the present invention.
FIG. 4 is a schematic view of the stirring head moving downward and rolling to the threaded hole to be repaired.
FIG. 5 is a schematic view of the mixing head moving upward away from the threaded hole to be repaired.
Fig. 6 is a schematic view of a repaired threaded hole being tapped to form a new threaded hole.
Fig. 7 is a cross-sectional view of fig. 6.
Description of reference numerals:
1-T-shaped groove, 2-filling material, 3-clamping part, 4-shaft shoulder and 5-stirring pin.
Detailed Description
The invention is further illustrated by the following figures and examples.
The friction stir welding repair method for the threaded hole is suitable for repairing the thread wear and the missing defects in the threaded hole, and the embodiment takes the repair process of an M8 threaded hole to be repaired on a 7075 aluminum alloy member with the depth of 12mm as an example, and specifically comprises the following steps:
step 1, preprocessing and processing a threaded hole to be repaired
Fixing a 7075 aluminum alloy component with a threaded hole to be repaired on a milling machine, uniformly processing four T-shaped grooves 1 with the same size along the circumferential direction of the threaded hole to be repaired by using a milling cutter, wherein each T-shaped groove extends along the height direction of the threaded hole to be repaired, as shown in fig. 1; size of T-groove 1: a is 3mm, B is 3mm, C is 6 mm; and after the T-shaped groove is processed, cleaning the threaded hole, removing oil stains and foreign matters until the threaded hole presents a uniform metal color, and cleaning with alcohol to wait for repair.
2.1 clamping 7075 aluminum alloy component on a clamping platform of a friction stir welding machine
Placing the 7075 aluminum alloy member pretreated in the step 1 on a clamping platform of a friction stir welding machine, clamping and fixing the 7075 aluminum alloy member, and ensuring that the central line of the M8 to-be-repaired threaded hole with the depth of 12mm on the 7075 aluminum alloy member is coaxial with a main shaft of the friction stir welding machine;
2.2 mounting the stirring head on the main shaft of the friction stir welding machine
As shown in fig. 3, the stirring head comprises a clamping portion 3, a shaft shoulder 4 and a stirring pin 5 which are connected in sequence, a platform is processed on the side wall of the clamping portion 3, and the stirring pin 5 is a smooth cylinder, so that the friction heat and the radial extrusion force in the repairing process can be improved; the end part of the stirring pin 5 is chamfered with a round angle; when the stirring head is installed, aligning a platform on the side wall of the clamping part 3 with a jacking screw hole of a main shaft of a friction stir welding machine, connecting the clamping part 3 of the stirring head with the main shaft of the friction stir welding machine by using the jacking screw, and enabling the stirring head to be coaxial with a threaded hole to be repaired; the specification of the stirring head adopted in the embodiment is as follows: the diameter of the stirring pin 5 is 7mm, the length of the stirring pin 5 is 12mm, the diameter of the shaft shoulder 5 is 18mm, and the diameter of the stirring pin after the circular arc chamfering at the end part is 4.9 mm.
3.1, manufacturing a circular ring-shaped filling material 2 by adopting 7075 aluminum alloy, wherein the manufactured filling material 2 has the outer diameter of 6.9mm, the inner diameter of 5mm and the height of 12 mm;
3.2 heating the filler material 2 to 400 c with an induction heating device and then placing the filler material 2 in the threaded hole to be repaired as shown in fig. 2.
As shown in fig. 4, the friction stir welding machine is started, the rotating speed omega of the stirring head is set to 4000rpm and rotates anticlockwise, and the lower rolling speed v1 is set to be 2 mm/min; when the shaft shoulder 4 of the stirring head is in contact with the upper surface of the threaded hole to be repaired, stopping rolling, keeping the rotating speed of 4000rpm and staying for 8 s; the pin is then withdrawn at a speed v2 of 5mm/min until the pin 5 is clear of the upper surface of the threaded hole to be repaired, at which point a smooth-walled cylindrical hole 7mm in diameter and 12mm deep is formed, as shown in figure 5.
And (3) tapping the smooth-walled cylindrical hole repaired in the step (4) by using a M8 tap to obtain a repaired M8 threaded hole, as shown in FIGS. 6 and 7.
It should be noted that, in other embodiments, the groove processed in the first step may not be a T-shaped groove, and may be an L-shaped groove, a 1-shaped groove or an S-shaped groove, for example, as long as the filling material can be extruded and mechanically interlocked. The number of grooves machined is preferably 2-4, since the mechanical self-locking formed by 1 groove is asymmetric. If the number of the grooves is too large, the hole wall matrix is cut too much, and the quality of repairing the threaded hole is affected.
Claims (8)
1. A friction stir welding repair method of a threaded hole is characterized by comprising the following steps:
step one, pretreatment processing
Uniformly processing 2-4 extrudable filling materials along the circumferential direction of the threaded hole to be repaired to form a mechanically interlocked groove, cleaning the threaded hole to be repaired after processing until the threaded hole to be repaired presents a uniform metal color, and cleaning the threaded hole to be repaired by using an organic solvent;
step two, clamping the workpiece with the threaded hole to be repaired and the stirring head
Clamping the threaded hole to be repaired on a clamping platform of a friction stir welding machine;
selecting a stirring head with corresponding specification and size according to the specification and size of the threaded hole to be repaired, mounting the stirring head on a main shaft of a friction stir welding machine, and enabling a stirring pin of the stirring head to be coaxial with the threaded hole to be repaired;
step three, manufacturing and placing filling materials
Selecting a material with the same material as the threaded hole to be repaired to prepare a circular ring-shaped filling material, wherein the height of the filling material is equal to the depth of the threaded hole to be repaired, and then heating the prepared filling material to the temperature of 100-800 ℃ and then placing the filling material in the threaded hole to be repaired;
step four, stirring and repairing
Starting a friction stir welding machine, enabling a stirring head to rotate at the speed of 100 plus 10000rpm and move downwards at the speed of 0.1-10mm/min, rolling a stirring pin of the stirring head downwards into a threaded hole to be repaired and contacting with the inner diameter of a filling material to generate heat by friction, stopping the rolling movement when the lower end face of the stirring pin contacts with the bottom of the threaded hole to be repaired, continuously keeping the rotation movement for 1-10s, and then drawing back the stirring head at the speed of 0.1-10mm/min until the stirring pin leaves the threaded hole to be repaired to obtain a smooth-walled cylindrical hole;
step five, tapping
And when the smooth-wall cylindrical hole is cooled to room temperature, tapping the smooth-wall cylindrical hole by adopting screw taps of corresponding models according to the actual size requirement of the threaded hole to be repaired to obtain the repaired threaded hole.
2. The friction stir welding repair method of a threaded hole according to claim 1, characterized in that:
the groove processed in the first step is a T-shaped groove, an L-shaped groove, an I-shaped groove or an S-shaped groove.
3. The friction stir welding repair method of a threaded hole according to claim 2, characterized in that: and all the grooves machined in the step one have the same structure and size.
4. A friction stir welding repair method of a threaded hole according to claim 3, characterized in that: the groove processed in the first step is a T-shaped groove, and the size of the T-shaped groove is as follows: a is 1-8mm, B is 2-10mm, C is 4-20 mm; a is the height of the transverse part and the width of the vertical part of the T-shaped groove, B is the height of the vertical part of the T-shaped groove, and C is the length of the transverse part of the T-shaped groove.
5. The friction stir welding repair method for threaded holes according to any one of claims 1 to 4, wherein the outer diameter of the annular filler material manufactured in the third step is 0 to 1mm smaller than the inner diameter of the threaded hole to be repaired, and the inner diameter of the annular filler material is 2 to 4mm smaller than the outer diameter thereof.
6. The friction stir welding repair method for threaded holes according to any one of claims 1 to 4, characterized in that: and the stirring head adopted in the second step is made of high-temperature alloy, and the rigidity and the wear resistance of the stirring head are superior to those of the threaded hole material to be repaired.
7. The friction stir welding repair method for threaded holes according to any one of claims 1 to 4, characterized in that: the ratio of the shaft shoulder diameter of the stirring head to the diameter of the stirring needle adopted in the second step is 2:1-10: 1.
8. The friction stir welding repair method for threaded holes according to any one of claims 1 to 4, characterized in that: and the diameter of the stirring pin adopted in the step two is equal to the inner diameter of the threaded hole to be repaired, and the diameter of the end part of the stirring pin after the arc chamfering is 0.1-0.5mm smaller than the inner diameter of the annular filling material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111396248.0A CN114406605B (en) | 2021-11-23 | 2021-11-23 | Friction stir welding repairing method for threaded hole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111396248.0A CN114406605B (en) | 2021-11-23 | 2021-11-23 | Friction stir welding repairing method for threaded hole |
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| CN114406605A true CN114406605A (en) | 2022-04-29 |
| CN114406605B CN114406605B (en) | 2023-04-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114939662A (en) * | 2022-05-27 | 2022-08-26 | 哈尔滨工业大学 | Device and method for repairing out-of-tolerance hole through coaxial radial additive remanufacturing |
| CN115476030A (en) * | 2022-08-26 | 2022-12-16 | 国营四达机械制造公司 | Internal thread friction stir welding repair processing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11885262B1 (en) | 2023-02-10 | 2024-01-30 | Pratt & Whitney Canada Corp. | Repairs for defects in bores |
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| CN102161088A (en) * | 2010-12-16 | 2011-08-24 | 张纪云 | Improved copper-clad aluminum wire and preparation method thereof |
| CN106670642A (en) * | 2017-01-23 | 2017-05-17 | 沈阳航空航天大学 | Friction-stir welding tool and method of repairing key hole defect by using friction-stir welding tool |
| CN108907374A (en) * | 2018-08-10 | 2018-11-30 | 常州博瑞电力自动化设备有限公司 | A kind of through hole whorl restorative procedure |
| KR20190041593A (en) * | 2017-10-13 | 2019-04-23 | 한국생산기술연구원 | Surface strengthening method and surface strengthened mold formed by applying the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161088A (en) * | 2010-12-16 | 2011-08-24 | 张纪云 | Improved copper-clad aluminum wire and preparation method thereof |
| CN106670642A (en) * | 2017-01-23 | 2017-05-17 | 沈阳航空航天大学 | Friction-stir welding tool and method of repairing key hole defect by using friction-stir welding tool |
| KR20190041593A (en) * | 2017-10-13 | 2019-04-23 | 한국생산기술연구원 | Surface strengthening method and surface strengthened mold formed by applying the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114939662A (en) * | 2022-05-27 | 2022-08-26 | 哈尔滨工业大学 | Device and method for repairing out-of-tolerance hole through coaxial radial additive remanufacturing |
| CN115476030A (en) * | 2022-08-26 | 2022-12-16 | 国营四达机械制造公司 | Internal thread friction stir welding repair processing method |
| CN115476030B (en) * | 2022-08-26 | 2023-12-19 | 国营四达机械制造公司 | Friction stir welding repair processing method for internal threads |
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| CN114406605B (en) | 2023-04-11 |
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