CN114029604A - Constant pressure device for friction stir welding - Google Patents
Constant pressure device for friction stir welding Download PDFInfo
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- CN114029604A CN114029604A CN202111339965.XA CN202111339965A CN114029604A CN 114029604 A CN114029604 A CN 114029604A CN 202111339965 A CN202111339965 A CN 202111339965A CN 114029604 A CN114029604 A CN 114029604A
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- 238000003756 stirring Methods 0.000 title claims abstract description 70
- 238000003466 welding Methods 0.000 title claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 11
- 238000009434 installation Methods 0.000 description 7
- 230000002950 deficient Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
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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
-
- 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
- B23K20/26—Auxiliary equipment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a constant pressure device for friction stir welding, belongs to the technical field of friction stir welding, and solves the problem that the welding quality is affected by over-large pressure or over-small pressure easily caused by controlling the pressure of a stirring head by the feeling of workers at present. This friction stir welding constant pressure device, including mount pad, strain gauge pressure sensor and constant pressure control system, strain gauge pressure sensor's bottom is provided with the connection pad, and the bottom of connection pad is provided with the gyration supporting seat. The pressure value applied to the surface of the workpiece by the stirring head can be monitored through the strain type pressure sensor, when the pressure is too high, the device can control the stirring head to reduce the pressure, and when the pressure is too low, the device can control the stirring head to increase the pressure, so that the pressure is ensured to be constant in a preset range, the surface of the workpiece is more attractive, the protection effect on welding equipment is achieved, and equipment accidents caused by the too high pressure are avoided.
Description
Technical Field
The invention belongs to the technical field of friction stir welding, and relates to a constant pressure device, in particular to a friction stir welding constant pressure device.
Background
Friction stir welding is characterized in that a welded material is locally melted by heat generated by friction between a welding tool rotating at a high speed and a workpiece, and when the welding tool moves forwards along a welding interface, the plasticized material flows from the front part to the rear part of the welding tool under the action of the rotating friction force of the welding tool and forms a compact solid-phase welding seam under the extrusion of the welding tool. During friction stir welding, the pressure applied by the stir head to the workpiece has a significant effect on the quality of the weld. In actual production, due to the fact that the surface of a welding seam is uneven and a workpiece deforms, the contact condition of the stirring head and the workpiece is changed constantly during welding, and pressure is unstable. When the welding pressure is too small, the welded joint cannot form a compact structure, so that the strength of the joint is reduced; when the welding pressure is too large, the friction between the stirring head and the workpiece generates too high heat, and the defects of holes, tunnels and the like are easily formed in the joint, so that the control on the pressure of the stirring head is very important.
At present, when friction stir welding is carried out, the pressure of a stirring head is mostly controlled according to the feeling of workers, the pressure is easily too large or too small, stable and reliable welding quality is difficult to obtain, the quality of products is uneven, defective products are sometimes even generated, and processing and production are seriously influenced.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a constant pressure device for friction stir welding, which can monitor the pressure value applied to the surface of a workpiece by a stirring head and control the pressure of the stirring head so as to ensure that the pressure is constant within a preset range.
The purpose of the invention can be realized by the following technical scheme:
a constant pressure device for friction stir welding comprises a mounting seat, a strain type pressure sensor and a constant pressure control system, the bottom of the strain type pressure sensor is provided with a connecting disc, the bottom of the connecting disc is provided with a rotary supporting seat, the constant pressure control system consists of a data receiving module, a processor, a judging module, a stirring head pressure control module and a pressure setting unit, the output end of the strain type pressure sensor is unidirectionally and electrically connected with a data transmission module, the output end of the data transmission module is unidirectionally and electrically connected with the input end of a data receiving module, the output end of the data receiving module is electrically connected with the input end of the processor in a one-way mode, the output end of the processor is electrically connected with the input end of the stirring head pressure control module in a one-way mode, and the output end of the processor is electrically connected with the input end of the judging module in a two-way mode.
The working principle of the invention is as follows: the preset value is set, in the welding process, the pressure borne by the stirring head is transmitted to the rotary bearing through the main shaft, then the strain type pressure sensor bears the pressure from the connecting disc, the strain type pressure sensor transmits the monitored pressure value to the processor through the data transmission module and the data receiving module, the processor compares the monitored value with the preset value through the driving judgment module, when the pressure value is higher than the preset value, the stirring head device is driven through the stirring head pressure control module, the pressure of the stirring head is reduced, and when the pressure value is lower than the preset value, the stirring head pressure control module controls the stirring head device to increase the applied pressure.
First thread groove has been seted up at strain gauge pressure sensor's top, the bottom of mount pad is run through and is provided with first bolt.
With the adoption of the structure, the strain type pressure sensor can be fixed when the first bolt enters the first thread groove, and the effect of fixed installation is realized.
The number of the first thread grooves is a plurality of and is distributed on the surface of the top of the strain type pressure sensor in an annular array mode, and the first bolts are in one-to-one correspondence with the first thread grooves.
By adopting the design, the first thread grooves are distributed more uniformly, the fixed points are enlarged, and the effect of fixing the installation of the corresponding variable pressure sensor is improved.
The connecting disc surface runs through and has seted up the through-hole, the inboard of through-hole is provided with the second bolt, the second thread groove has been seted up at the top of gyration supporting seat, and the inner wall threaded connection of second bolt and second thread groove.
By adopting the structure, the second bolt is rotated into the second thread groove, so that the effect that the connecting disc is fixed with the rotary supporting seat can be realized.
The inner diameter of the through hole is smaller than the outer diameter of the top end of the second bolt, and the total depth of the through hole and the second thread groove is larger than the length of the second bolt.
By adopting the structure, the second bolt can completely enter the through hole, and the top end of the second bolt is prevented from being exposed outside to influence the installation.
The pressure setting unit is composed of a pressure setting module and a numerical value input module, the output end of the pressure setting module is electrically connected with the input end of the numerical value input module in a one-way mode, and the output end of the numerical value input module is electrically connected with the input end of the processor in a one-way mode.
Structure more than adopting for give the treater with pressure numerical value and preserve, set for invariable pressure value from making things convenient for the staff.
The pressure setting unit further comprises a numerical value deleting module, the output end of the pressure setting module is electrically connected with the input end of the numerical value deleting module in a one-way mode, and the output end of the numerical value deleting module is electrically connected with the input end of the processor in a one-way mode.
By adopting the structure, the pressure value data stored in the processor is deleted, so that the preset pressure value is changed.
The constant-pressure control system further comprises an alarm module, and the output end of the alarm module is respectively and unidirectionally electrically connected with a first alarm lamp and a second alarm lamp.
By adopting the structure, the worker is reminded of overlarge or undersize pressure, so that the worker can timely perform related operations to adjust the pressure.
The first warning light and the second warning light are rotary flashing warning lights, and the models of the first warning light and the second warning light are LTE-1101J.
By adopting the structure, the two groups of warning lamps can perform sound-light alarm, thereby playing the role of double alarm and more easily arousing the attention of workers.
The constant pressure control system further comprises a display module, and the output end of the data receiving module is electrically connected with the input end of the display module in a one-way mode.
Structure more than adopting, display module can show pressure value data on the display screen to make things convenient for the staff to know more directly perceivedly.
Compared with the prior art, the constant pressure device for friction stir welding has the following advantages:
1. the pressure value applied to the surface of a workpiece by the stirring head can be monitored through the strain type pressure sensor, when the pressure is too high, the device can control the stirring head to reduce the pressure, when the pressure is too low, the device can control the stirring head to increase the pressure, so that the pressure is ensured to be constant within a preset range, the surface of the workpiece is more attractive, the protection effect on welding equipment is achieved, equipment accidents caused by the too high pressure are avoided, defective goods are not easily generated, and the problem that the welding quality is influenced because the too high or too low pressure is easily caused because the pressure of the stirring head is controlled by the sense of workers at present is solved.
2. Through the setting of first thread groove and first bolt, when first bolt got into the inside of first thread groove, can be fixed strain type pressure sensor and mount pad mutually, realize carrying out the effect fixed to strain type pressure sensor.
3. Through the setting of pressure setting module and numerical value input module, the pressure setting module is used for inputing predetermined pressure numerical value, and numerical value input module is used for transmitting pressure numerical value for the treater and stores to be used for setting for invariable pressure value.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an enlarged schematic view of the invention at a in fig. 1.
Fig. 3 is a schematic diagram of a strain gauge pressure sensor before installation.
Fig. 4 is a schematic front sectional view of a strain gauge pressure sensor according to the present invention.
Fig. 5 is a schematic top view of a strain gauge pressure sensor according to the present invention.
Fig. 6 is a schematic block diagram of the system of the present invention.
Fig. 7 is a system schematic block diagram of the pressure setting unit of the present invention.
In the figure, 1, a mounting seat; 2. a strain gauge pressure sensor; 3. a connecting disc; 4. a rotary supporting seat; 5. a first bolt; 6. a first thread groove; 7. a through hole; 8. a second thread groove; 9. and a second bolt.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-7, the constant pressure device for friction stir welding comprises a mounting base 1, a strain type pressure sensor 2 and a constant pressure control system, wherein a mounting reference surface of the strain type pressure sensor 2 is in contact with the mounting base 1, a connecting disc 3 is arranged at the bottom of the strain type pressure sensor 2, a rotary supporting seat 4 is arranged at the bottom of the connecting disc 3, the constant pressure control system comprises a data receiving module, a processor, a judging module, a stirring head pressure control module and a pressure setting unit, an output end of the strain type pressure sensor 2 is unidirectionally and electrically connected with a data transmission module, an output end of the data transmission module is unidirectionally and electrically connected with an input end of the data receiving module, an output end of the data receiving module is unidirectionally and electrically connected with an input end of the processor, and an output end of the processor is unidirectionally and electrically connected with an input end of the stirring head pressure control module, the stirring head pressure control module is externally connected with a stirring head control system for controlling the stirring friction device so as to drive the stirring head to control the pressure, the output end of the processor is electrically connected with the input end of the judgment module in a bidirectional way, the device can monitor the pressure value applied to the surface of the workpiece by the stirring head through the strain type pressure sensor 2, and when the pressure is overlarge, the device can control the stirring head to reduce the pressure, and when the pressure is too small, the device can control the stirring head to increase the pressure, thereby ensuring the pressure to be constant in a preset range, leading the surface of the workpiece to be more beautiful, playing a role in protecting welding equipment, avoiding equipment accidents caused by overlarge pressure, meanwhile, defective products are not easily generated, and the problem that the welding quality is influenced due to the fact that the pressure of the stirring head is easily too high or too low because the pressure is controlled by the sense of workers at present is solved.
The quantity of first thread groove 6 is a plurality of and is the surface of annular array distribution at strain gauge pressure sensor 2 top, first bolt 5 and the mutual one-to-one of first thread groove 6, in this embodiment, through adopting above-mentioned design, it makes first thread groove 6 distribute more extensively even to enlarge the fixed point between strain gauge pressure sensor 2 and the mount pad 1, promote the fixed effect of installation simultaneously.
Through-hole 7 has been seted up in connection pad 3 surface running through, the inboard of through-hole 7 is provided with second bolt 9, second thread groove 8 has been seted up at the top of gyration supporting seat 4, and the inner wall threaded connection of second bolt 9 and second thread groove 8, in this embodiment, through the setting of second bolt 9 and second thread groove 8, pass through-hole 7 and rotatory inside that gets into second thread groove 8 with second bolt 9, alright fix connection pad 3 and gyration supporting seat 4 mutually, realize connection pad 3 and the effect of gyration supporting seat 4 mutual installation.
The inner diameter of the through hole 7 is smaller than the outer diameter of the top end of the second bolt 9, the total depth of the through hole 7 and the second thread groove 8 is larger than the length of the second bolt 9, and the top end of the second bolt 9 is provided with a hexagonal groove for hexagonal prism insertion so as to rotate the second bolt 9. in the embodiment, by designing the total depth of the through hole 7 and the second thread groove 8 to be larger than the length of the second bolt 9, the second bolt 9 can completely enter the through hole 7 and the second thread groove 8, and the top end of the second bolt 9 is prevented from being exposed outside the through hole 7 to affect installation.
The pressure setting unit comprises pressure setting module and numerical value input module, the one-way electric connection of output and the input of numerical value input module of pressure setting module, the one-way electric connection of output and the input of treater of numerical value input module, in this embodiment, through the setting of pressure setting module and numerical value input module, the pressure setting module is used for inputing predetermined pressure value, and numerical value input module is used for transmitting pressure value for the treater and stores, thereby be used for setting for invariable pressure value.
The pressure setting unit further comprises a numerical value deleting module, the output end of the pressure setting module is electrically connected with the input end of the numerical value deleting module in a one-way mode, the output end of the numerical value deleting module is electrically connected with the input end of the processor in a one-way mode, and in the embodiment, the numerical value deleting module is used for deleting preset pressure value data stored in the processor, so that the preset pressure value data can be changed and old data can be deleted.
The constant pressure control system further comprises an alarm module, the output end of the alarm module is respectively and unidirectionally electrically connected with a first warning lamp and a second warning lamp, in the embodiment, the first warning lamp and the second warning lamp are arranged through the alarm module, when the pressure value monitored by the strain type pressure sensor 2 is lower than a preset value, the first warning lamp is turned on, and when the monitored pressure value is higher than the preset value, the second warning lamp is turned on to remind a worker, so that the worker can timely perform related operations to correct the pressure applied by the stirring head or timely stop the equipment.
First warning light and second warning light are rotatory flashing warning light, and the model of first warning light and second warning is LTE-1101J, and the colour of first warning light is different with the colour of second warning light, be used for distinguishing two warning lights, in this embodiment, be rotatory flashing warning light through designing first warning light and second warning light, it makes first warning light and second warning light homoenergetic enough carry out acousto-optic warning, thereby play the effect of dual warning, can arouse staff's attention more easily.
The constant pressure control system is characterized by further comprising a display module, wherein the output end of the data receiving module is electrically connected with the input end of the display module in a one-way mode, the display module is connected with an external operating device through the display screen, in the embodiment, the display module can receive pressure value data transmitted by the data receiving module and can display the pressure value data on the display screen, and therefore workers can know the pressure value more intuitively.
The working principle of the invention is as follows: firstly, inputting a reasonable pressure value to a processor through a pressure setting module, then starting welding operation on a workpiece by a stirring head of the friction stir welding device, transmitting the pressure on the stirring head to a rotary bearing through a main shaft in the welding process and transmitting the pressure to a connecting disc 3, then receiving the pressure from the connecting disc 3 by a strain type pressure sensor 2, namely the pressure on the stirring head and the pressure applied on the surface of the workpiece by the stirring head, then transmitting the monitored pressure value to a data transmission module by the strain type pressure sensor 2, then transmitting the pressure value to the processor through a data receiving module, comparing the monitored value with a preset value by the processor through a driving judgment module, and driving the stirring head device by the processor through a stirring head pressure control module when the monitored pressure value is judged to be higher than the preset value by the judgment module, thereby reduce the pressure value of stirring head to the within range of default, and when judging that the pressure value of monitoring is lower than the default as the judgement module, stirring head pressure control module drive stirring head device to increase the applied pressure, until the within range of default, thereby realize the constant control to applied pressure.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The constant pressure device for friction stir welding comprises a mounting seat (1), a strain type pressure sensor (2) and a constant pressure control system, and is characterized in that a connecting disc (3) is arranged at the bottom of the strain type pressure sensor (2), a rotary supporting seat (4) is arranged at the bottom of the connecting disc (3), the constant pressure control system comprises a data receiving module, a processor, a judging module, a stirring head pressure control module and a pressure setting unit, the output end of the strain type pressure sensor (2) is unidirectionally and electrically connected with a data transmission module, the output end of the data transmission module is unidirectionally and electrically connected with the input end of the data receiving module, the output end of the data receiving module is unidirectionally and electrically connected with the input end of the processor, the output end of the processor is unidirectionally and electrically connected with the input end of the stirring head pressure control module, the output end of the processor is electrically connected with the input end of the judging module in a bidirectional mode.
2. The constant pressure device for friction stir welding according to claim 1, wherein a first thread groove (6) is formed at the top of the strain type pressure sensor (2), and a first bolt (5) is arranged at the bottom of the mounting base (1) in a penetrating manner.
3. The constant-pressure device for friction stir welding according to claim 2, wherein the number of the first thread grooves (6) is several and the first thread grooves are distributed on the surface of the top of the strain gauge pressure sensor (2) in an annular array, and the first bolts (5) and the first thread grooves (6) are in one-to-one correspondence.
4. The constant pressure device for friction stir welding according to claim 1, wherein a through hole (7) is formed through the surface of the connecting disc (3), a second bolt (9) is arranged inside the through hole (7), a second thread groove (8) is formed at the top of the rotary support base (4), and the second bolt (9) is in threaded connection with the inner wall of the second thread groove (8).
5. A friction stir welding constant pressure device according to claim 4, wherein the inner diameter of said through hole (7) is smaller than the outer diameter of the tip of the second bolt (9), and the combined depth of said through hole (7) and the second thread groove (8) is larger than the length of the second bolt (9).
6. The constant pressure device for friction stir welding according to claim 1, wherein the pressure setting unit is composed of a pressure setting module and a numerical value input module, an output end of the pressure setting module is unidirectionally electrically connected with an input end of the numerical value input module, and an output end of the numerical value input module is unidirectionally electrically connected with an input end of the processor.
7. The constant pressure device for friction stir welding according to claim 6, wherein the pressure setting unit further comprises a value deleting module, an output end of the pressure setting module is unidirectionally electrically connected with an input end of the value deleting module, and an output end of the value deleting module is unidirectionally electrically connected with an input end of the processor.
8. The constant pressure device for friction stir welding according to claim 1, wherein the constant pressure control system further comprises an alarm module, and the output end of the alarm module is electrically connected with a first alarm lamp and a second alarm lamp respectively in a one-way manner.
9. The constant pressure device for friction stir welding according to claim 8, wherein the first warning lamp and the second warning lamp are both rotary flashing warning lamps, and the first warning lamp and the second warning lamp are both LTE-1101J in model.
10. The constant pressure device for friction stir welding according to claim 1, wherein the constant pressure control system further comprises a display module, and the output terminal of the data receiving module is electrically connected to the input terminal of the display module in a single direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111339965.XA CN114029604A (en) | 2021-11-12 | 2021-11-12 | Constant pressure device for friction stir welding |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111339965.XA CN114029604A (en) | 2021-11-12 | 2021-11-12 | Constant pressure device for friction stir welding |
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| CN114029604A true CN114029604A (en) | 2022-02-11 |
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| CN202111339965.XA Pending CN114029604A (en) | 2021-11-12 | 2021-11-12 | Constant pressure device for friction stir welding |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0119458D0 (en) * | 2000-09-01 | 2001-10-03 | Honda Motor Co Ltd | Friction stir welding apparatus |
| US20100072261A1 (en) * | 2008-09-25 | 2010-03-25 | Marcio Fernando Cruz | Friction stir welding spindle downforce and other control techniques, systems and methods |
| CN202199929U (en) * | 2011-07-12 | 2012-04-25 | 上海宝研机械液压技术发展有限公司 | Integrated controller of friction stir welding equipment |
| CN105921876A (en) * | 2016-06-20 | 2016-09-07 | 江苏科技大学 | Friction stirring welding tool feeding back press-in depth and torque |
| CN205798688U (en) * | 2016-06-24 | 2016-12-14 | 航天工程装备（苏州）有限公司 | A kind of constant pressure welding head for ultra-thick friction stir welding machine |
| CN107138848A (en) * | 2017-05-09 | 2017-09-08 | 沈阳理工大学 | Pressure and moment of torsion On-line sampling system device for agitating friction weldering |
| CN111975190A (en) * | 2020-09-07 | 2020-11-24 | 湖南坤鼎数控科技有限公司 | Friction stir welding constant pressure structure device |
| CN113118616A (en) * | 2021-05-14 | 2021-07-16 | 昆山哈工万洲焊接研究院有限公司 | Pressure-displacement coupling control friction stir welding system |
-
2021
- 2021-11-12 CN CN202111339965.XA patent/CN114029604A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0119458D0 (en) * | 2000-09-01 | 2001-10-03 | Honda Motor Co Ltd | Friction stir welding apparatus |
| US20100072261A1 (en) * | 2008-09-25 | 2010-03-25 | Marcio Fernando Cruz | Friction stir welding spindle downforce and other control techniques, systems and methods |
| CN202199929U (en) * | 2011-07-12 | 2012-04-25 | 上海宝研机械液压技术发展有限公司 | Integrated controller of friction stir welding equipment |
| CN105921876A (en) * | 2016-06-20 | 2016-09-07 | 江苏科技大学 | Friction stirring welding tool feeding back press-in depth and torque |
| CN205798688U (en) * | 2016-06-24 | 2016-12-14 | 航天工程装备（苏州）有限公司 | A kind of constant pressure welding head for ultra-thick friction stir welding machine |
| CN107138848A (en) * | 2017-05-09 | 2017-09-08 | 沈阳理工大学 | Pressure and moment of torsion On-line sampling system device for agitating friction weldering |
| CN111975190A (en) * | 2020-09-07 | 2020-11-24 | 湖南坤鼎数控科技有限公司 | Friction stir welding constant pressure structure device |
| CN113118616A (en) * | 2021-05-14 | 2021-07-16 | 昆山哈工万洲焊接研究院有限公司 | Pressure-displacement coupling control friction stir welding system |
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Application publication date: 20220211 |
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