CN109128489B - Friction stir welding device for aerospace barrel structural part - Google Patents
Friction stir welding device for aerospace barrel structural part Download PDFInfo
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- CN109128489B CN109128489B CN201811186847.8A CN201811186847A CN109128489B CN 109128489 B CN109128489 B CN 109128489B CN 201811186847 A CN201811186847 A CN 201811186847A CN 109128489 B CN109128489 B CN 109128489B
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- friction stir
- driven gear
- stir welding
- welding device
- gear disc
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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
- B23K20/122—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 using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—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 using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
Abstract
The invention discloses a friction stir welding device for a structural member of a spaceflight cylinder, which comprises a telescopic supporting rod, wherein the top end of the upper part of the telescopic supporting rod is connected with a top fixing plate in a welding manner, the middle of the top fixing plate is connected with an intermediate connecting rod in a sleeve manner, a sliding sleeve is sleeved outside the intermediate connecting rod, an intermediate fixing block is arranged between the sliding sleeve and the sliding sleeve, the top end of a second automatic telescopic rod is connected with a driven gear disc through a bearing, the lower part of the driven gear disc is connected with a driving gear disc in a meshing manner, the middle of the driving gear disc is connected with a rotating shaft, a friction stir head is arranged at the top end of the driven gear disc, and a fixing mounting plate connected through a connecting shaft is arranged above. This friction stir welding device of space flight barrel structure is carrying out the in-process that uses, can be automatic adjust work to the stirring head for whole welding process is in coherent state, makes the work efficiency of whole device high.
Description
Technical Field
The invention relates to the technical field related to friction stir welding of aerospace cylinders, in particular to a friction stir welding device for a structural member of an aerospace cylinder.
Background
Friction stir welding is a connection method for heating metal and further fixing metal, as in conventional welding methods, and friction stir welding is a welding method using frictional heat and plastic deformation heat as heat sources, however, although friction stir welding devices in the existing market are numerous in types and number, there are still some problems, for example, in the process of using the friction stir welding devices, the problem of damage often occurs during the process of friction heating of the stir heads, and further, in the whole welding process, frequent replacement of the stir heads is often required, in the process of replacement, a lot of time is consumed, so that the work efficiency of the whole friction stir welding is low, and in the process of welding, due to the external shape of the whole device, the whole device cannot be well suitable for welding of a cylinder body, the application range of the whole welding device is too limited, so that the friction stir welding device which is convenient for solving the problems and is convenient for welding the aerospace cylinder is provided.
Disclosure of Invention
The invention aims to provide a friction stir welding device for a structural member of a spaceflight cylinder, which aims to solve the problems that the friction stir welding device in the prior market cannot well weld and connect cylinders, and a stirring head needs to be frequently replaced in the welding process, so that the working efficiency of the whole device is low.
In order to achieve the purpose, the invention provides the following technical scheme: a friction stir welding device for a aerospace cylinder structure comprises a telescopic supporting rod, wherein the top end of the telescopic supporting rod is connected with a top fixing plate in a welding mode, the middle of the top fixing plate is connected with an intermediate connecting rod in a sleeved mode, a sliding sleeve is sleeved outside the intermediate connecting rod, an intermediate fixing block is arranged between the sliding sleeve and the sliding sleeve, a hollow ring penetrates through the inner portion of the intermediate fixing block, a movable mounting plate is arranged in the middle of the hollow ring, the outer portion of the movable mounting plate is connected with the intermediate fixing block through a sliding connecting seat, a handle is inlaid in the intermediate fixing block, a first motor is installed at the top end of the upper portion of the intermediate fixing block, the bottom of the first motor penetrates through the intermediate fixing block and is connected with a lead screw, a limiting supporting rod is arranged below the movable mounting plate, and a first automatic telescopic, a rotating sleeve is fixedly arranged at the top end of one side of the first automatic telescopic rod, a screw rod is sleeved in the rotating sleeve, a second motor is arranged at the top end of the other side of the first automatic telescopic rod, the output end of the second motor penetrates through the protective cover to be connected with the rotating shaft, a pawl is arranged above the rotating shaft, an external rotating disk is arranged outside the pawl, one side of the external rotating disk is connected with one side of the protective cover through a fixed supporting rod, a second automatic telescopic rod is arranged on the surface of one side of the external rotating disk, a first sliding groove is embedded in the surface of the other side of the external rotating disk, the top end of the second automatic telescopic rod is connected with the driven gear disk through a bearing, the lower portion of the driven gear disk is connected with the driving gear disk in a meshing manner, the middle of the driving gear disk is connected with the, and a fixed mounting plate connected through a connecting shaft is arranged above the middle fixed block.
Preferably, the limiting support rod comprises a first outer cylinder and a second outer cylinder, the second outer cylinder is sleeved inside the first outer cylinder, and a gap between the first outer cylinder and the second outer cylinder is larger than zero.
Preferably, the top ends of the limiting support rod and the screw rod are both connected with the top end of the movable mounting plate in a welding manner, and the bottom of the limiting support rod is also connected with the first automatic telescopic rod in a welding manner
Preferably, the protection cover is of an arc structure, two protection covers are symmetrically arranged on the rotating sleeve, and the horizontal length of each protection cover is smaller than that of the rotating shaft.
Preferably, the external surface of the rotating shaft is symmetrically provided with 2 pawls, the top end of the rotating shaft and the driving gear disc are in an integral structure, and the driving gear disc and the driven gear disc are in meshed connection.
Preferably, a ratchet is arranged in the middle of the outer rotating disk, the ratchet and the pawl are mutually clamped, and a first annular sliding groove is formed in one side surface of the outer rotating disk.
Preferably, the driven gear disc is arranged on one side of the external rotating disc at an equal angle, the driven gear disc forms a telescopic structure under the action of the second automatic telescopic rod, and the stirring friction head is fixedly arranged at the central position of the driven gear disc.
Preferably, sliding connection seat top is provided with slider and removal gyro wheel, and the slider setting is in sliding connection seat's top position, and the removal gyro wheel setting is in sliding connection seat's top position to mutual block between slider and the second spout, the outside of slider, the inside of second spout and the surface of removing the gyro wheel are smooth plane simultaneously.
Compared with the prior art, the invention has the beneficial effects that: the friction stir welding device for the aerospace cylinder structural member can automatically adjust the stirring head in the using process, so that the whole welding process is in a coherent state, the working efficiency of the whole device is high, meanwhile, the whole device can be well suitable for the welding work of the cylinder, and the application range of the whole device is wider;
(1) the driving gear disc and the second automatic telescopic rod can enable the driven gear disc to rotate, the position of the driven gear disc above the driving gear disc can be well changed by matching with the arrangement of the external rotating disc, and then the effect of replacing the stirring friction head on the driven gear disc is achieved by continuously adjusting the driven gear disc, so that the whole device is in a coherent state in the welding process, the stirring friction head does not need to be frequently replaced, and the working efficiency of the whole device is higher;
(2) whole friction stir head sets up about the both sides of swivel mount, the regulation work of the first automatic telescopic link of cooperation, the position to friction stir head that can be fine carries out regulation work, carry out the lift work again under the effect of lead screw, make the whole device can be fine be applicable to the weldment work of barrel, the mounting panel is rotatory under the effect of middle fixed block simultaneously, the angle to friction stir head that can be fine carries out regulation work, make the whole device can be applicable to the weldment work of the inside different positions of barrel, make the application range of whole device wider.
Drawings
FIG. 1 is a schematic main sectional view of the present invention;
FIG. 2 is a schematic sectional view of the rotary shaft and the external rotary disk according to the present invention;
FIG. 3 is a left side view of the external rotating disk of the present invention;
FIG. 4 is a schematic diagram of the right view of the external rotating disk of the present invention;
FIG. 5 is a schematic top view of the rotating sleeve of the present invention;
FIG. 6 is a schematic view of a spacing strut according to the present invention;
FIG. 7 is a schematic top view of the top fixing plate of the present invention;
FIG. 8 is an enlarged view of the structure at A in FIG. 7 according to the present invention;
fig. 9 is a schematic view of a connection structure of the intermediate fixing block and the sliding connection seat.
In the figure: 1. a telescopic support rod; 2. a top fixing plate; 3. a sliding sleeve; 4. a first motor; 5. a limit strut; 501. a first outer barrel; 502. a second outer barrel; 6. a screw rod; 7. a rotating sleeve; 8. a first automatic telescopic rod; 9. a second motor; 10. a protective cover; 11. a rotating shaft; 12. a pawl; 13. an outer rotating disk; 1301. a ratchet; 14. a second automatic telescopic rod; 15. a driven gear plate; 16. a driving gear plate; 17. fixing the support rod; 18. a first chute; 19. a middle connecting rod; 20. a hollow ring; 21. a connecting shaft; 22. fixing the mounting plate; 23. a middle fixed block; 24. a sliding connection seat; 2401. a slider; 2402. moving the roller; 25. a grip; 26. a movable mounting plate; 27. a second chute; 28. and (4) stirring the friction head.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-9, the present invention provides a technical solution: a friction stir welding device for a aerospace cylinder structural member comprises a telescopic supporting rod 1, a top fixing plate 2, a sliding sleeve 3, a first motor 4, a limiting supporting rod 5, a screw rod 6, a rotary sleeve 7, a first automatic telescopic rod 8, a second motor 9, a protective cover 10, a rotary shaft 11, a pawl 12, an external rotary disk 13, a second automatic telescopic rod 14, a driven gear disk 15, a driving gear disk 16, a fixed supporting rod 17, a first sliding chute 18, an intermediate connecting rod 19, a hollow ring 20, a connecting shaft 21, a fixed mounting plate 22, an intermediate fixing block 23, a sliding connecting seat 24, a handle 25, a movable mounting plate 26, a second sliding chute 27 and a friction stir head 28, wherein the top end of the upper part of the telescopic supporting rod 1 is connected with the top fixing plate 2 in a welding manner, the middle of the top fixing plate 2 is connected with the intermediate connecting rod 19 in a sleeve manner, a middle fixed block 23 is arranged between the sliding sleeve 3 and the sliding sleeve 3, a hollow ring 20 penetrates through the middle of the middle fixed block 23, a movable mounting plate 26 is arranged in the middle of the hollow ring 20, the outer part of the movable mounting plate 26 is connected with the middle fixed block 23 through a sliding connection seat 24, a handle 25 is embedded in the middle fixed block 23, a first motor 4 is arranged at the top end of the upper part of the middle fixed block 23, the bottom of the first motor 4 penetrates through the middle fixed block 23 to be connected with a screw rod 6, a limit support rod 5 is arranged below the movable mounting plate 26, a first automatic telescopic rod 8 is connected to the bottom of the limit support rod 5, a rotary sleeve 7 is fixedly arranged at the top end of one side of the first automatic telescopic rod 8, the screw rod 6 is sleeved in the rotary sleeve 7, a second motor 9 is arranged at the top end of the other side of the first automatic telescopic rod 8, and the output end, and a pawl 12 is arranged above the rotating shaft 11, an external rotating disk 13 is arranged outside the pawl 12, one side of the external rotating disk 13 is connected with one side of the protective cover 10 through a fixed support rod 17, a second automatic telescopic rod 14 is arranged on one side surface of the external rotating disk 13, a first sliding chute 18 is inlaid in the other side surface of the external rotating disk 13, the top end of the second automatic telescopic rod 14 is connected with a driven gear disk 15 through a bearing, the lower part of the driven gear disk 15 is connected with a driving gear disk 16 in a meshing manner, the middle of the driving gear disk 16 is connected with the rotating shaft 11, a stirring friction head 28 is arranged at the top end of the driven gear disk 15, and a fixed mounting plate 22 connected through a connecting shaft 21 is arranged above a middle fixed block 23.
Spacing branch 5 includes first urceolus 501 and second urceolus 502, and the inside cover of first urceolus 501 is equipped with second urceolus 502 to the clearance between first urceolus 501 and the second urceolus 502 is greater than zero, makes things convenient for second urceolus 502 can carry out the flexible work of freedom in the inside of first urceolus 501, conveniently carries out spacing work.
For welded connection between the top of spacing branch 5 and lead screw 6 all and the top of movable mounting plate 26, and also for welded connection between the bottom of spacing branch 5 and first automatic telescopic link 8, conveniently carry out spacing work to first automatic telescopic link 8 under spacing branch 5's effect for swivel sleeve 7 can reciprocate the work.
The protection casing 10 is arc structure, and protection casing 10 is provided with two about swivel mount 7 symmetry to the horizontal length of protection casing 10 is less than the length of rotation axis 11, conveniently carries out the protection work to whole device inside carrying out the welded in-process.
The outside surface symmetry of rotation axis 11 is provided with 2 pawls 12, and structure as an organic whole between the top of rotation axis 11 and the driving gear dish 16 to be connected for the meshing between driving gear dish 16 and the driven gear dish 15, conveniently drive outside rotary disk 13 rotatory under the effect of pawl 12, also conveniently drive driven gear dish 15 and carry out high-speed rotatory work under the effect of driving gear dish 16.
The middle of the outer rotating disk 13 is provided with a ratchet 1301, the ratchet 1301 is mutually clamped with the pawl 12, and one side surface of the outer rotating disk 13 is provided with a first annular sliding groove 18, so that the position fixing work of the outer rotating disk 13 is facilitated.
The driven gear disc 15 is arranged on one side of the external rotating disc 13 at the same angle, the driven gear disc 15 forms a telescopic structure under the action of the second automatic telescopic rod 14, and the stirring friction head 28 is fixedly mounted at the center of the driven gear disc 15, so that different driven gear discs 15 can be conveniently replaced under the rotating action of the external rotating disc 13.
The working principle is as follows: when the friction stir welding device for the aerospace cylinder structural member is used, firstly, the internal length and the angle of the whole device need to be adjusted, and in the adjusting process, according to the drawings of fig. 1, fig. 5 and fig. 7-9, firstly, the position of the protective cover 10 needs to be adjusted, in the adjusting process, firstly, the first automatic telescopic rod 8 needs to be started, so that the first automatic telescopic rod 8 can carry out lifting work, in the lifting process, the position of the protective cover 10 can be well adjusted, after the adjustment is finished, the height of the telescopic supporting rod 1 can be well adjusted, after the appropriate height is adjusted, a worker places the aerospace cylinder needing to be welded at the bottom of the top fixing plate 2, so that the central point of the aerospace cylinder and the central point of the screw rod 6 coincide with each other, then, the angle of the protective cover 10 can be well adjusted according to the position to be welded inside the aerospace cylinder, in the adjusting process, firstly, a worker is required to disassemble the fixed mounting plate 22 and the movable mounting plate 26 under the action of the fastening bolt, then, the sliding connecting seats 24 around the movable mounting plate 26 can be slid inside the middle fixing block 23 under the action of the handle 25, the friction force of the sliding connecting seats 24 inside the middle fixing block 23 can be well reduced due to the arrangement of the sliding block 2401 and the moving roller 2402, so that the rotating operation of the movable mounting plate 26 can be conveniently carried out, the movable mounting plate 26 can well drive the screw rod 6 and the limiting support rod 5 to rotate by rotating, and further, the protective cover 10 can be well driven to rotate under the action of the rotating sleeve 7, so that the adjusting operation before the device is used can be well completed, the whole device can be well welded;
in the process of working, as shown in fig. 1-6, first, the first motor 4 needs to be started to enable the first motor 4 to drive the screw rod 6 to rotate, and in the process of rotating the screw rod 6, the external part of the screw rod is enabled to perform the up-and-down lifting work by the rotating sleeve 7 which is limited under the action of the limiting support rod 5, meanwhile, the second motor 9 needs to be started by a worker to enable the second motor 9 to perform the clockwise rotating work, because the pawl 12 on the rotating shaft 11 connected with the second motor 9 does not perform the limiting work on the ratchet 1301 on the external rotating disk 13 in the clockwise rotating process of the second motor 9, the rotating shaft 11 can drive the driving gear disk 16 above to rotate, then the driving gear disk 16 is meshed with the driven gear disk 15 above, the driven gear disk 15 rotates to drive the stirring friction head 28 at the top end to rotate, further, the effect of up-and-down moving welding is achieved, and when the friction stir head 28 needs to be replaced during the welding process, the worker only needs to rotate the second motor 9 in the reverse direction, during the rotation process, the ratchets 1301 and the pawls 12 are engaged with each other, then the outer rotating disk 13 is rotated, during the rotation process, the positions of the 4 driven gear disks 15 above the outer rotating disk are changed, then the worker starts the second automatic telescopic rod 14, so that the second automatic telescopic rod 14 is lifted according to the positions of the different driven gear disks 15 (the driven gear disk 15 connected with the friction stir head 28 needing to be operated is in a meshed relation with the driving gear disk 16), thereby, the whole device can flexibly replace the friction stir head 28 during the welding process, the whole device can perform continuous welding work, the working efficiency is improved, and a series of friction stir welding work is further completed.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides a space flight barrel structure friction stir welding device, includes flexible bracing piece (1), its characterized in that: the telescopic support rod is characterized in that the top end of the telescopic support rod (1) is connected with the top fixing plate (2) in a welding manner, the middle of the top fixing plate (2) is connected with the middle connecting rod (19) in a sleeve manner, the outer part of the middle connecting rod (19) is sleeved with the sliding sleeve (3), the middle of the sliding sleeve (3) and the sliding sleeve (3) is provided with the middle fixing block (23), the inner part of the middle fixing block (23) penetrates through the hollow ring (20), the middle of the hollow ring (20) is provided with the movable mounting plate (26), the outer part of the movable mounting plate (26) is connected with the middle fixing block (23) through the sliding connecting seat (24), the inner part of the middle fixing block (23) is inlaid with the handle (25), the first motor (4) is installed at the top end position of the middle fixing block (23), and the bottom of the first motor (4) penetrates through the, the utility model discloses a safety protection device, including movable mounting plate (26), movable mounting plate (26) below is provided with spacing branch (5), the bottom of spacing branch (5) is connected with first automatic telescopic link (8), and one side top fixed mounting of first automatic telescopic link (8) has swivel nut (7), and the inside cover of swivel nut (7) is equipped with lead screw (6), second motor (9) are installed on the opposite side top of first automatic telescopic link (8), and the output of second motor (9) runs through protection casing (10) and is connected with rotation axis (11), and the top of rotation axis (11) is provided with pawl (12), the outside of pawl (12) is provided with outside rotary disk (13), and one side of outside rotary disk (13) is connected with one side of protection casing (10) through fixed support pole (17) to a side surface mounting of outside rotary disk (13) has second automatic telescopic link (14), the opposite side surface mosaic of outside rotary disk (13) has first spout (18), be connected through the bearing between the top of the automatic telescopic link of second (14) and driven gear dish (15), and the meshing is connected between the below of driven gear dish (15) and driving gear dish (16), and the centre of driving gear dish (16) is connected with rotation axis (11), and the top of driven gear dish (15) is provided with stirring friction head (28), the top of middle fixed block (23) is provided with fixed mounting board (22) of connecting through connecting axle (21) and connecting.
2. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: spacing branch (5) include first urceolus (501) and second urceolus (502), and the inside cover of first urceolus (501) is equipped with second urceolus (502) to clearance between first urceolus (501) and second urceolus (502) is greater than zero.
3. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: the top ends of the limiting support rods (5) and the lead screw (6) are both connected with the top end of the movable mounting plate (26) in a welding mode, and the bottom of the limiting support rods (5) is also connected with the first automatic telescopic rod (8) in a welding mode.
4. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: the protective cover (10) is of an arc-shaped structure, two protective covers (10) are symmetrically arranged relative to the rotating sleeve (7), and the horizontal length of each protective cover (10) is smaller than that of the rotating shaft (11).
5. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: the outer surface of the rotating shaft (11) is symmetrically provided with 2 pawls (12), the top end of the rotating shaft (11) and the driving gear disc (16) are of an integral structure, and the driving gear disc (16) is in meshed connection with the driven gear disc (15).
6. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: the middle of the outer rotating disk (13) is provided with a ratchet (1301), the ratchet (1301) is mutually clamped with the pawl (12), and one side surface of the outer rotating disk (13) is provided with a first annular sliding groove (18).
7. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: the driven gear disc (15) is arranged on one side of the external rotating disc (13) at equal angles, the driven gear disc (15) forms a telescopic structure under the action of the second automatic telescopic rod (14), and a stirring friction head (28) is fixedly mounted at the center position of the driven gear disc (15).
8. The friction stir welding device of a spacecraft barrel structural member of claim 1, wherein: slider (2401) and removal gyro wheel (2402) are provided with to sliding connection seat (24) top, and slider (2401) sets up the top position at sliding connection seat (24), and removal gyro wheel (2402) set up the top position at sliding connection seat (24) to mutual block between slider (2401) and second spout (27), the outside of slider (2401), the inside of second spout (27) and the surface of removing gyro wheel (2402) are smooth plane simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811186847.8A CN109128489B (en) | 2018-10-12 | 2018-10-12 | Friction stir welding device for aerospace barrel structural part |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811186847.8A CN109128489B (en) | 2018-10-12 | 2018-10-12 | Friction stir welding device for aerospace barrel structural part |
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| CN109128489A CN109128489A (en) | 2019-01-04 |
| CN109128489B true CN109128489B (en) | 2020-06-30 |
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| CN110369858B (en) * | 2019-07-25 | 2021-05-04 | 沈阳航空航天大学 | Method for repairing defects of inner wall of cylindrical structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013099777A (en) * | 2011-10-13 | 2013-05-23 | Nsk Ltd | Apparatus and method for friction stir welding |
| FR3046558A1 (en) * | 2016-01-07 | 2017-07-14 | Snecma | VARIABLE INERTIAL INERTIAL FRICTION WELDING |
| CN108115264A (en) * | 2017-12-31 | 2018-06-05 | 广东柳泰焊接科技有限公司 | A kind of friction stir weld part |
| CN108746987A (en) * | 2018-06-19 | 2018-11-06 | 湖南文理学院 | A kind of friction stir weld device of girth welding |
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2018
- 2018-10-12 CN CN201811186847.8A patent/CN109128489B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013099777A (en) * | 2011-10-13 | 2013-05-23 | Nsk Ltd | Apparatus and method for friction stir welding |
| FR3046558A1 (en) * | 2016-01-07 | 2017-07-14 | Snecma | VARIABLE INERTIAL INERTIAL FRICTION WELDING |
| CN108115264A (en) * | 2017-12-31 | 2018-06-05 | 广东柳泰焊接科技有限公司 | A kind of friction stir weld part |
| CN108746987A (en) * | 2018-06-19 | 2018-11-06 | 湖南文理学院 | A kind of friction stir weld device of girth welding |
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