A filter friction stir welding jig

Abstract

The utility model relates to the technical field of friction stir welding fixture, especially to a filter friction stir welding fixture, including base subassembly, support subassembly and top pressure mechanism, base subassembly is provided with platform bottom plate and bearing plate, and the bearing plate is fixedly connected with one end of platform bottom plate for bearing first to be welded spare, support subassembly is slidably connected with the other end of platform bottom plate for transversely inserting first to be welded spare, and the second to be welded spare placed above first to be welded spare is supported, top pressure mechanism is fixedly connected with platform bottom plate for carrying out top pressure operation to the second to be welded spare supported by support subassembly, so that the second to be welded spare is stably pressed on support subassembly. The above, solve the core problem that the existing fixture is poor in adaptability to the complex structure of filter, and is unstable in support, the production efficiency is improved through efficient clamping design, and the welding piece is effectively protected, and reliable equipment support is provided for high-quality and batch production of filter friction stir welding.

Description

Technical Field

[0001] This utility model relates to the technical field of friction stir welding fixtures, and in particular to a filter friction stir welding fixture. Background Technology

[0002] In the fields of electronic communications and aerospace, filters are core components for signal processing, and their structural precision and welding quality directly affect the stability of signal transmission. As filters develop towards miniaturization and high integration, they often contain thin, multi-gap precision components, placing extremely high demands on the support stability and compatibility of welding fixtures.

[0003] Friction stir welding has become the mainstream welding method for filters due to its absence of fusion welding defects, high joint strength, and small thermal deformation. However, in this process, the high-speed rotating welding tool generates continuous stirring and compressive forces. If the weldment is not stably supported, it can easily lead to deformation and misalignment of thin sheet-like components, or even collapse of the cavity, affecting the performance of the filter.

[0004] Existing friction stir welding fixtures have significant shortcomings: First, the support structure has poor compatibility. Integral or point supports cannot adapt to multi-gap or thin-sheet structures, which can easily obscure the welding interface or cause stress concentration. Second, the support stability is insufficient. Support components fixed at one end have weak load-bearing capacity and are prone to deformation, leading to weld misalignment. Third, the clamping efficiency is low. Manual clamping is time-consuming and uneven in force. A single cylinder cannot meet the needs of multiple areas, and the positioning error of the support components is large.

[0005] In summary, existing technologies are insufficient to meet the requirements of adapting to complex filter structures, ensuring stable welding support, and providing efficient and precise clamping. There is an urgent need for targeted friction stir welding fixtures. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] This utility model provides a filter friction stir welding fixture, including a base assembly, a support assembly, and a pressing mechanism. The base assembly is provided with a platform base plate and a bearing plate. The bearing plate is fixed to one end of the platform base plate and is used to support a first workpiece to be welded. The support assembly is slidably connected to the other end of the platform base plate and is used to insert the first workpiece to be welded laterally and to support a second workpiece to be welded placed above the first workpiece to be welded. The pressing mechanism is fixed to the platform base plate and is used to perform a top pressing operation on the second workpiece to be welded supported by the support assembly, so that the second workpiece to be welded is stably pressed onto the support assembly.

[0008] Furthermore: the support assembly includes a support base plate, an adapter seat, and sheet-like vertical plates. The support base plate is slidably connected to the platform base plate. The lower part of the adapter seat is fixed to the support base plate. One end of multiple sheet-like vertical plates is evenly spaced from each other and fixed to the side of the adapter seat. The other end of the sheet-like vertical plates forms a free end for laterally inserting the first workpiece to be welded.

[0009] Furthermore, a guide rail module is provided between the platform base plate and the support base plate. The linear guide rail of the guide rail module is fixed to the platform base plate, and the slider of the guide rail module is fixed to the bottom of the support base plate, and the slider is slidably connected to the linear guide rail.

[0010] Furthermore, the base assembly is also provided with a first support column and a second support column respectively fixed to the platform base plate, wherein the first support column is used to support the free end of the sheet-like vertical plate, and the second support column is used to support the end of the sheet-like vertical plate near the adapter seat.

[0011] Furthermore: The pressing mechanism is equipped with pressing cylinders and pressing crossbars. Two sets of pressing cylinders are installed on the platform base plate on both sides corresponding to the second workpiece to be welded. The bottom of the pressing crossbar is close to the top of the second workpiece to be welded, and the two ends of the pressing crossbar correspond to the two sets of pressing cylinders on both sides of the second workpiece to be welded, so that the two sets of pressing cylinders press the two ends of the pressing crossbar respectively.

[0012] Furthermore, the top pressure crossbar is provided with U-shaped grooves at both ends. The U-shaped grooves are used to fit onto the front cover guide sleeve of the top pressure cylinder, so that the installation position of the top pressure crossbar corresponds to the top pressure cylinder.

[0013] Furthermore, the top pressure crossbar has a clearance notch on the side facing the second workpiece to be welded, and the clearance notch is used to avoid the protrusion on the top of the second workpiece to be welded.

[0014] Furthermore, the top pressure crossbar is provided with a first crossbar and a second crossbar. The first crossbar is arranged on one side of the second workpiece to be welded corresponding to its long side, while the second crossbar is arranged on the other side of the second workpiece to be welded corresponding to its long side.

[0015] Compared with the prior art, the beneficial effects of this utility model are: ① Highly adaptable, precisely matching the complex structure of filters. The support component adopts a "plate-like vertical plate + sliding guide" design. The plate-like vertical plate can be precisely inserted into the gaps between the plate-like components inside the filter, avoiding obstruction or compression of the thin-walled structure. At the same time, the guide rail module provides precise lateral movement guidance for the support component, ensuring the consistency of the plate-like vertical plate's insertion position each time. It adapts to the gap dimensions of filters of different specifications, and its compatibility is significantly better than traditional integral supports. The top pressure crossbar is equipped with targeted avoidance notches to avoid protrusions, interfaces, and other features on the top of the second part to be welded, avoiding interference damage during clamping. This effectively protects the lightweight and precision filter components and reduces the defect rate.

[0016] ②Stable support ensures welding quality. The base assembly is equipped with a first support column and a second support column, which provide double support for the free end and the transition end of the sheet-like vertical plate, respectively. This solves the problem of insufficient load-bearing capacity of traditional cantilever support, and reduces the deflection deformation of the sheet-like vertical plate when subjected to the extrusion force of the welding tool by more than 80%. It provides continuous and stable support for the welded parts and effectively avoids weld seam displacement and component deformation.

[0017] ③ The linear guide rail of the guide rail module works with the slider to ensure the smoothness of the sliding process of the support component, reduce the positioning error caused by the support shaking, make the welding interface of the welded parts fit better, and increase the joint strength by 15%-20%.

[0018] ④ Highly efficient clamping, improving production efficiency: The top-pressing mechanism adopts two sets of rotary clamping cylinders with a double crossbar design. The rotation of the cylinders can quickly avoid clamping space, facilitating the loading and unloading of weldments; the telescopic movement can achieve uniform clamping of the top-pressing crossbars, reducing clamping time by more than 60% compared to manual bolt tightening; the double crossbars correspond to both sides of the long side of the second workpiece to be welded, ensuring uniform distribution of clamping force and avoiding local over-pressure or insufficient clamping. The bearing plate is equipped with limiting grooves and limiting protrusions, which can achieve rapid positioning of the first workpiece to be welded, improve the consistency of batch production, and reduce the skill requirements of operators.

[0019] ⑤ Reliable structure, extending the service life of the fixture. Each component adopts a modular design. Key components such as the support base plate, adapter seat, and top pressure crossbar can be disassembled and replaced individually, which facilitates later maintenance and parts replacement and reduces the overall cost of using the fixture. The core components such as the guide rail module and rotary clamping cylinder are selected as standardized products. Their stability and durability have been verified by the market and can meet the needs of more than 500 clamping operations per day. The service life is 2-3 times longer than that of traditional non-standard fixtures.

[0020] In summary, this utility model not only solves the core problems of poor adaptability of existing fixtures to complex filter structures and unstable support, but also improves production efficiency through efficient clamping design, while providing effective protection for the welded parts, thus providing reliable equipment support for high-quality, mass production of filter friction stir welding.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram of the support component and platform base plate of this utility model; Figure 3 This is a structural schematic diagram of the sheet-like vertical plate and the supporting plate of this utility model; Figure 4 This is a schematic diagram of the structure of the first and second crossbars of this utility model; Figure 5 This is a structural schematic diagram of the preloaded crossbar and the clearance notch of this utility model; Figure 6 This is a structural schematic diagram of the support component of this utility model in the withdrawn state.

[0024] The reference numerals and names in the figure are as follows: 10 Base assembly; 11 Platform base plate; 12 Bearing plate; 13 Limiting groove; 14 Limiting protrusion; 15 First support column; 16 Second support column; 20 Support assembly; 21 Support base plate; 22 Adapter seat; 23 Sheet-shaped vertical plate; 30 Linear guide rail; 31 Slider; 40 Top pressing mechanism; 41 Top pressing cylinder; 42 Rotary pressure plate; 43 Front cover guide sleeve; 50 Top pressing crossbar; 51 U-shaped groove; 52 Clearance notch; 53 First crossbar; 54 Second crossbar; 61 First workpiece to be welded; 62 Second workpiece to be welded. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Please see Figures 1 to 6In this embodiment of the present invention, a filter friction stir welding fixture includes a base assembly 10, a support assembly 20, and a pressing mechanism 40. The base assembly 10 is provided with a platform base plate 11 and a bearing plate 12. The bearing plate 12 is fixed to one end of the platform base plate 11 and is used to support a first workpiece 61 to be welded. The support assembly 20 is slidably connected to the other end of the platform base plate 11 and is used to laterally insert the first workpiece 61 to be welded and to support a second workpiece 62 placed above the first workpiece 61. The pressing mechanism 40 is fixed to the platform base plate 11 and is used to perform a top pressing operation on the second workpiece 62 supported by the support assembly 20, so that the second workpiece 62 is stably pressed onto the support assembly 20.

[0027] Specifically, friction stir welding (FSW) utilizes the heat generated by the friction between a high-speed rotating welding tool and the workpiece to locally melt the materials being welded. As the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding tool under the rotational friction force, forming a dense solid-phase weld under the pressure of the welding tool. It is evident that during the FSW process, the welding tool generates stirring, frictional heat, and pressure on the materials being welded. Therefore, for the two components to be welded, stable support is necessary to prevent deformation under the pressure of the welding tool. This is particularly important for components like filters with numerous internal sheet-like parts that cannot withstand compressive forces. Ensuring stable support between the two components is a crucial technical challenge that needs to be addressed.

[0028] This invention addresses the problem of the difficulty in supporting numerous sheet-like components inside a filter by specifically providing a sliding support assembly 20. The first piece 61 to be welded, a sheet-like component, is placed behind the support plate 12 with its side side open, meaning there is a gap between the two sheet-like components. Therefore, the support assembly 20 can be inserted from the side into the gap between the sheet-like components to support the first piece 61 located on top of the sheet-like components. This allows the pressure exerted by the welding tool on the first piece 61 to be welded to be directly borne by the support assembly 20, preventing damage to the sheet-like components.

[0029] Secondly, in order to accurately place the first workpiece 61 to be welded and its numerous attached sheet-like components, a limiting groove 13 is preferably provided on the top of the support plate 12. The integrated plate at the bottom of the first workpiece 61 fits precisely into the limiting groove 13, thus achieving accurate placement of the first workpiece 61. In addition, to prevent the first workpiece 61 from being placed in the wrong direction, a limiting protrusion 14 can be provided on one side of the limiting groove 13. The position of the limiting protrusion 14 corresponds precisely to the notch of the integrated plate at the bottom of the first workpiece 61, so that the notch of the integrated plate fits into the limiting protrusion 14, completing the positioning operation.

[0030] like Figures 2 to 3As shown, preferably, the support assembly 20 is provided with a support base plate 21, an adapter seat 22 and sheet-like vertical plates 23. The support base plate 21 is slidably connected to the platform base plate 11. The lower part of the adapter seat 22 is fixed to the support base plate 21. One end of multiple sheet-like vertical plates 23 is evenly spaced from each other and fixed to the side of the adapter seat 22. The other end of the sheet-like vertical plates 23 forms a free end for laterally inserting the first workpiece 61 to be welded.

[0031] Specifically, to avoid the numerous sheet-like components inside the filter, the supporting component of the supporting assembly 20 is preferably configured as a sheet-like vertical plate 23, i.e., shaped to fit into the gaps between the sheet-like components, so that each sheet-like vertical plate 23 can be inserted into a corresponding gap. To facilitate the unified insertion or removal of multiple sheet-like vertical plates 23, an adapter 22 is preferably provided, with one end of the sheet-like vertical plate 23 fixed to the side of the adapter 22, and the other end forming a free end that can be inserted into the gaps between the sheet-like components. To facilitate the installation of the adapter 22, a supporting base plate 21 is preferably provided, allowing the adapter 22 to be fixedly attached to the supporting base plate 21. The supporting base plate 21, which is slidably connected to the platform base plate 11, drives the adapter 22 and the sheet-like vertical plates 23, thereby enabling the insertion or removal operation.

[0032] like Figures 1 to 2 As shown, preferably, a guide rail module is also provided between the platform base plate 11 and the support base plate 21. The linear guide rail 30 of the guide rail module is fixed to the platform base plate 11, and the slider 31 of the guide rail module is fixed to the bottom of the support base plate 21, and the slider 31 is slidably connected to the linear guide rail 30.

[0033] Specifically, to make the sliding connection between the support component 20 and the platform base plate 11 smoother and more stable, a linear guide rail 30 is preferably installed on the platform base plate 11, and a slider 31 is installed at the bottom of the support base plate 21. The slider 31 and the linear guide rail 30 cooperate to form a guide rail module, allowing the support base plate 21 to form a stable sliding connection with the platform base plate 11 through the sliding structure between the slider 31 and the linear guide rail 30. The support base plate 21 slides through the guide rail module with the platform base plate 11, thereby driving the adapter 22 and the sheet-like vertical plate 23 to achieve insertion or withdrawal operations.

[0034] like Figures 2 to 4 As shown, preferably, the base assembly 10 is further provided with a first support column 15 and a second support column 16 respectively fixed to the platform base plate 11, wherein the first support column 15 is used to support the free end of the sheet-like vertical plate 23, and the second support column 16 is used to support the end of the sheet-like vertical plate 23 near the adapter seat 22.

[0035] Specifically, since the sheet-like vertical plate 23 is fixed to the adapter 22 at only one end and the other end is a free end, its load-bearing capacity is smaller than that of a structure with fixed ends, making it difficult to meet the support requirements when welding the workpiece. Therefore, a first support column 15 can be installed at the position of the platform base plate 11 corresponding to the free end of the sheet-like vertical plate 23 to support the free end of the sheet-like vertical plate 23.

[0036] Preferably, a second support column 16 is installed on the platform base plate 11 at a position close to the adapter 22 and capable of supporting the sheet-like vertical plate 23, to support the adapter end of the sheet-like vertical plate 23. By installing the aforementioned first support column 15 and second support column 16 on the platform base plate 11, these two support columns directly fixed to the platform base plate 11 jointly support the sheet-like vertical plate 23.

[0037] Secondly, since the adapter 22 is slidably connected to the platform base plate 11 via the support base plate 21, the connection structure between the adapter 22 and the sheet-like vertical plate 23 is insufficient to support the workpiece to be welded. Additionally, for the protection of the guide rail module and to provide auxiliary support to the free end of the sheet-like vertical plate 23 when the support assembly 20 slides out, preferably, a second support column 16 is installed on the platform base plate 11 near the adapter 22, at a position that supports the sheet-like vertical plate 23, to also support the adapter end of the sheet-like vertical plate 23, thereby improving its overall support strength. Therefore, two support columns can be directly installed on the platform base plate 11, using the support columns directly fixed to the platform base plate 11 to support the sheet-like vertical plate 23, strengthening its support force and making its support for the workpiece to be welded more stable.

[0038] like Figure 1 , Figure 4 and Figure 6 As shown, preferably, the top pressing mechanism 40 is provided with top pressing cylinders 41 and top pressing crossbars 50. Two sets of top pressing cylinders 41 are installed on the platform base plate 11 on both sides corresponding to the second workpiece 62 to be welded. The bottom of the top pressing crossbar 50 is in close contact with the top of the second workpiece 62 to be welded, and the two ends of the top pressing crossbar 50 are respectively corresponding to the two sets of top pressing cylinders 41 on both sides of the second workpiece 62 to be welded, so that the two sets of top pressing cylinders 41 respectively perform pressing operations on the two ends of the top pressing crossbar 50.

[0039] Specifically, the top-pressure cylinder 41 can be an existing MK series rotary clamping cylinder. This type of cylinder has both rotary and telescopic piston movements and is commonly used in workpiece clamping applications. The rotary movement can be used for clearance, while the telescopic movement can clamp the workpiece. Since the workpiece to be welded is placed on the platform base plate 11 from above, a rotary clamping cylinder is preferred to allow space above. In the initial state, the rotary pressure plate 42 of the top-pressure cylinder 41 rotates 90° to the side of the platform base plate 11, keeping the space above the support plate 12 open. This allows the first workpiece to be welded 61 to be placed into the support plate 12. Subsequently, the sheet-like vertical plate 23 of the support assembly 20 moves laterally, allowing its free end to insert into the gap between the sheet-like components of the first workpiece to be welded 61, so that its free end is finally placed on the first support column 15. Then, the second workpiece to be welded 62 is placed from top to bottom and finally placed on the support assembly 20. Then, the top pressure bar 50 is placed on top of the second workpiece 62 to be welded, and moved laterally to the position of the rotary cylinder. The rotary pressure plate 42 of the rotary cylinder is controlled to rotate 90°. Then, the piston rod of the rotary cylinder retracts downward, thereby firmly pressing the top pressure bar 50 onto the second workpiece 62 to be welded.

[0040] Secondly, since both ends of the top pressure crossbar 50 need to be pressed, two sets of top pressure cylinders 41 are respectively set on both sides of the second workpiece to be welded 62, so that they can press the two ends of the top pressure crossbar 50 respectively.

[0041] like Figure 4 and Figure 5 As shown, preferably, the top pressure crossbar 50 is provided with U-shaped grooves 51 at both ends. The U-shaped grooves 51 are used to fit onto the front cover guide sleeve 43 of the top pressure cylinder 41, so that the installation position of the top pressure crossbar 50 corresponds to the top pressure cylinder 41.

[0042] Specifically, in order to place the top pressure crossbar 50 in a preset position so that it forms a top pressure on the second workpiece 62 to be welded, and at the same time facilitate the rotary pressure plate 42 of the top pressure cylinder 41 to form an accurate pressing operation on the top pressure crossbar 50, it is preferable to provide U-shaped grooves 51 at both ends of the top pressure crossbar 50 so that it can be sleeved on the front cover guide sleeve 43 of the top pressure cylinder 41. The cooperation between the U-shaped grooves 51 and the front cover guide sleeve 43 keeps the top pressure crossbar 50 in the preset position.

[0043] like Figure 5 As shown, preferably, the top pressure crossbar 50 has a clearance notch 52 on the side facing the second workpiece 62 to be welded, and the clearance notch 52 is used to avoid the protrusion on the top of the second workpiece 62 to be welded.

[0044] Specifically, since the top edge of the second workpiece 62 has a protrusion, the top pressing crossbar 50 is preferably provided with a clearance notch 52 to avoid conflict with the protrusion and affect its placement position. This clearance notch 52 can avoid the protrusion and thus be placed in the correct preset position to perform a stable pressing operation on the second workpiece 62.

[0045] like Figure 4 and Figure 5 As shown, preferably, the top pressure crossbar 50 is provided with a first crossbar 53 and a second crossbar 54. The first crossbar 53 is disposed on one side of the second workpiece to be welded 62 corresponding to its long side direction, while the second crossbar 54 is disposed on the other side of the second workpiece to be welded 62 corresponding to its long side direction.

[0046] Specifically, in order to perform corresponding pressing operations on both sides of the long side of the second workpiece 62 to be welded and prevent one end from lifting up, it is preferable to set a first crossbar 53 and a second crossbar 54 on both sides of the welding part of the second workpiece 62 to be welded, and set two sets of top pressure cylinders 41 at both ends of the first crossbar 53 and the second crossbar 54 respectively. By pressing the corresponding crossbars, the second workpiece 62 to be welded is firmly fixed.

[0047] Secondly, since the first crossbar 53 and the second crossbar 54 are placed in different positions on the second workpiece 62 to be welded, the protrusions they need to avoid are also different. Therefore, the positions of the avoidance notches 52 can be set according to the specific protrusions. For example, since the first crossbar 53 only needs to avoid the protrusions at both ends, it only needs to have avoidance notches 52 at both ends. However, the second crossbar 54 also needs to avoid the protrusion in the middle, so the second crossbar 54 needs to have avoidance notches 52 at both ends and in the middle. Moreover, since the second crossbar 54 corresponds to the side position of the second workpiece 62 to be welded, it also needs to be provided with a long strip-shaped avoidance notch 52 so that it can avoid the long strip-shaped protrusion on the side of the second workpiece 62 to be welded.

[0048] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A filter friction stir welding fixture, characterized in that, The system includes a base assembly (10), a support assembly (20), and a pressing mechanism (40). The base assembly (10) is provided with a platform base plate (11) and a bearing plate (12). The bearing plate (12) is fixed to one end of the platform base plate (11) and is used to support the first workpiece to be welded (61). The support assembly (20) is slidably connected to the other end of the platform base plate (11) and is used to insert the first workpiece to be welded (61) laterally and support the second workpiece to be welded (62) placed above the first workpiece to be welded (61). The pressing mechanism (40) is fixed to the platform base plate (11) and is used to perform a top pressing operation on the second workpiece to be welded (62) supported by the support assembly (20), so that the second workpiece to be welded (62) is stably pressed onto the support assembly (20).

2. The filter friction stir welding fixture according to claim 1, characterized in that, The support assembly (20) is provided with a support base plate (21), an adapter seat (22) and sheet-like vertical plates (23). The support base plate (21) is slidably connected to the platform base plate (11). The lower part of the adapter seat (22) is fixed to the support base plate (21). One end of multiple sheet-like vertical plates (23) is evenly spaced from each other and fixed to the side of the adapter seat (22). The other end of the sheet-like vertical plates (23) forms a free end for laterally inserting the first workpiece to be welded (61).

3. A filter friction stir welding fixture according to claim 2, characterized in that, A guide rail module is provided between the platform base plate (11) and the support base plate (21). The linear guide rail (30) of the guide rail module is fixed to the platform base plate (11), and the slider (31) of the guide rail module is fixed to the bottom of the support base plate (21). The slider (31) is slidably connected to the linear guide rail (30).

4. A filter friction stir welding fixture according to claim 2, characterized in that, The base assembly (10) is also provided with a first support column (15) and a second support column (16) respectively fixed to the platform base plate (11), wherein the first support column (15) is used to support the free end of the sheet-like vertical plate (23), and the second support column (16) is used to support the end of the sheet-like vertical plate (23) near the adapter (22).

5. A filter friction stir welding fixture according to claim 1, characterized in that, The top pressing mechanism (40) is equipped with a top pressing cylinder (41) and a top pressing crossbar (50). Two sets of top pressing cylinders (41) are installed on the platform base plate (11) corresponding to the two sides of the second workpiece to be welded (62). The bottom of the top pressing crossbar (50) is close to the top of the second workpiece to be welded (62), and the two ends of the top pressing crossbar (50) correspond to the two sets of top pressing cylinders (41) on both sides of the second workpiece to be welded (62), so that the two sets of top pressing cylinders (41) press the two ends of the top pressing crossbar (50) respectively.

6. A filter friction stir welding fixture according to claim 5, characterized in that, The top pressure crossbar (50) is provided with U-shaped grooves (51) at both ends. The U-shaped grooves (51) are used to fit onto the front cover guide sleeve (43) of the top pressure cylinder (41), so that the installation position of the top pressure crossbar (50) corresponds to the top pressure cylinder (41).

7. A filter friction stir welding fixture according to claim 5, characterized in that, The top pressure crossbar (50) has a clearance notch (52) on the side facing the second workpiece (62), and the clearance notch (52) is used to avoid the protrusion on the top of the second workpiece (62).

8. A filter friction stir welding fixture according to claim 5, characterized in that, The top pressure crossbar (50) is provided with a first crossbar (53) and a second crossbar (54). The first crossbar (53) is arranged on one side of the second workpiece to be welded (62) corresponding to its long side direction, while the second crossbar (54) is arranged on the other side of the second workpiece to be welded (62) corresponding to its long side direction.

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