Friction stir welding device

Abstract

The utility model discloses a friction stir welding device which comprises a welding machine head, a first pressing plate assembly and a second pressing plate assembly, and a welding needle is rotationally installed at one end of the welding machine head. The first pressing plate assembly is used for abutting against the workpiece, and the first pressing plate assembly is installed on the welding machine head; the second pressing plate assembly is used for abutting against the workpiece and installed on the welding machine head, and the first pressing plate assembly, the second pressing plate assembly and the welding needle are arranged in a triangular shape. When the friction stir welding device is used for welding the corner of the workpiece, one of the first pressing plate assembly and the second pressing plate assembly can abut against the workpiece, the workpiece is prevented from tilting, and therefore the welding quality of the corner of the workpiece is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding device technical field, especially in a kind of friction stir welding device. BACKGROUND

[0002] New energy battery box is welded to water cooling plate on box by friction stir welding equipment when manufacturing. The existing friction stir welding equipment usually includes moving mechanism and the friction stir welding device installed on the moving mechanism, the moving mechanism is used to drive the friction stir welding device to move and rotate along the welding route, the friction stir welding device includes welding head, and the welding needle for friction stir welding is rotatably installed on the welding head, and the welding head will usually install a compression wheel component, in the welding process, along the welding direction, the compression wheel component is pressed in front to prevent water cooling plate from being raised, and the welding needle of the friction stir welding device is welded to the water cooling plate behind the compression wheel. However, new energy battery box has many corners, when the friction stir welding device is welded to the corner, the compression wheel of the compression wheel component exceeds the range of water cooling plate, at this time, the compression wheel of the compression wheel component needs to be lifted to avoid the box, and after turning the corner, the compression wheel component is pressed again, therefore, the existing friction stir welding device cannot press the water cooling plate when welding at the corner, and it is difficult to guarantee the welding quality at the corner. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, the utility model provides a friction stir welding device, which can guarantee the welding quality at the corner of a workpiece.

[0004] The friction stir welding device according to the embodiment of the utility model comprises a welding head, a first pressing plate component and a second pressing plate component, the welding head is rotatably installed with a welding needle at one end; the first pressing plate component is used for pressing a workpiece, and the first pressing plate component is installed on the welding head; the second pressing plate component is used for pressing a workpiece, and the second pressing plate component is installed on the welding head, wherein the first pressing plate component, the second pressing plate component and the welding needle are arranged in a triangular shape.

[0005] The friction stir welding device according to the embodiment of the utility model has at least the following beneficial effects: in the friction stir welding device provided by the utility model, the first pressing plate component, the second pressing plate component and the welding needle are arranged in a triangular shape, so that when the friction stir welding device welds the corner of a workpiece, it can be guaranteed that one of the first pressing plate component and the second pressing plate component can press the workpiece, prevent the workpiece from being raised, and thus guarantee the welding quality at the corner of the workpiece.

[0006] According to some embodiments of the utility model, the first pressing plate assembly includes a first mounting frame and a first pressing wheel for pressing the workpiece, the first mounting frame is mounted on the welding head, and the first pressing wheel is rotatably mounted on the first mounting frame; the second pressing plate assembly includes a second mounting frame and a second pressing wheel for pressing the workpiece, the second mounting frame is mounted on the welding head, and the second pressing wheel is rotatably mounted on the second mounting frame, wherein the second pressing wheel, the first pressing wheel and the welding needle are arranged in a triangular shape, the second pressing wheel is smaller than the first pressing wheel, and the distance between the second pressing wheel and the welding needle is smaller than the distance between the first pressing wheel and the welding needle.

[0007] According to some embodiments of the utility model, a position adjusting structure is arranged between the welding head and the second mounting frame, and the position adjusting structure is used for adjusting the mounting position of the second mounting frame around the axis of the welding needle.

[0008] According to some embodiments of the utility model, the welding head includes a head main body and a head cover, the head cover is rotatably sleeved on one end of the head main body, the welding needle is rotatably mounted on one end of the head main body, the position adjusting structure includes the head cover and at least one locking bolt, one of the head cover and the welding head is provided with at least two mounting holes arranged circumferentially around the axis of the welding needle, and the other mounting hole is provided with the locking bolt, each locking bolt can be screwed with any one mounting hole, and the second mounting frame is connected to the head cover.

[0009] According to some embodiments of the utility model, the second mounting frame includes a fixing member, a sliding member and a reset structure, the fixing member is mounted on the welding head, the sliding member is mounted on the fixing member and can slide along the axis of the welding needle, the second pressing wheel is rotatably mounted on one end of the sliding member away from the fixing member, and the reset structure is used for driving the sliding member to slide towards the second pressing wheel.

[0010] According to some embodiments of the utility model, the fixing member and the sliding member are arranged along the axis of the welding needle, the sliding member is connected with a guide rod, one end of the guide rod is slidably arranged in the fixing member, a limiting portion for limiting the guide rod from being separated from the fixing member is arranged on the guide rod, and the reset structure includes a reset spring, the reset spring is sleeved on the guide rod, and the reset spring abuts against the fixing member and the sliding member.

[0011] According to some embodiments of the utility model, the fixing member is mounted on the welding head through a bolt.

[0012] According to some embodiments of the utility model, the second pressing wheel is connected to the second mounting frame in a universal manner.

[0013] According to some embodiments of the present application, the first mounting frame comprises a base, a driver and a pull rod, the base is mounted on the welding head, the driver is mounted on the base, the pull rod is slidingly mounted on the base through a first guide rail structure, the pull rod is connected with the driver, the driver is used for driving the pull rod to slide along the axial direction of the welding pin, and the first pressing wheel is mounted on the pull rod.

[0014] According to some embodiments of the present application, the pull rod is connected with a pressing rod, the pressing rod is arranged to be inclined relative to the pull rod, and the first pressing wheel is rotatably mounted on one end of the pressing rod away from the driver.

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 FIG. 1 is a schematic view of a friction stir welding device according to an embodiment of the present application;

[0018] Figure 2 FIG. 2 is an enlarged view of the friction stir welding device at A shown in FIG. 1; Figure 1 FIG. 3 is an exploded view of the friction stir welding device shown in FIG. 1;

[0019] Figure 3 FIG. 4 is a schematic view of the friction stir welding device when welding a workpiece in a clockwise direction shown in FIG. 1; Figure 1 FIG. 5 is a schematic view of the friction stir welding device when welding a workpiece in a counterclockwise direction shown in FIG. 1.

[0020] Figure 4 FIG. 6 is a schematic view of the friction stir welding device when welding a workpiece in a clockwise direction shown in FIG. 1; Figure 1 FIG. 7 is a schematic view of the friction stir welding device when welding a workpiece in a counterclockwise direction shown in FIG. 1.

[0021] Figure 5 FIG. 8 is a schematic view of the friction stir welding device when welding a workpiece in a clockwise direction shown in FIG. 1; Figure 1 FIG. 9 is a schematic view of the friction stir welding device when welding a workpiece in a counterclockwise direction shown in FIG. 1.

[0022] LIST OF REFERENCE NUMERALS:

[0023] Welding machine head 100, head body 110, mounting hole 111, head cover 120, locking bolt 130, welding needle 200, first pressing plate assembly 300, first mounting frame 310, base 311, driver 312, pull rod 313, first guide rail structure 314, pressing rod 315, first pressing wheel 320, second pressing plate assembly 400, second mounting frame 410, fixing piece 411, sliding piece 412, reset structure 413, guide rod 414, limiting part 415, second pressing wheel 420, workpiece 500. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0025] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0026] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0027] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0028] Referring to Figures 1 to 3The utility model discloses a stirring friction welding device, including welding machine head 100, first pressure plate subassembly 300 and second pressure plate subassembly 400, and one end of welding machine head 100 rotatablely installs welding needle 200, first pressure plate subassembly 300 is used to resist pressure work piece 500, and first pressure plate subassembly 300 is installed in welding machine head 100, second pressure plate subassembly 400 is used to resist pressure work piece 500, and second pressure plate subassembly 400 is installed in welding machine head 100, wherein, first pressure plate subassembly 300, second pressure plate subassembly 400 and welding needle 200 are triangularly arranged, i.

[0029] With Figure 1 The axial direction of the welding needle 200 is upward and downward, the first pressure plate subassembly 300 can be located on the right side of the welding needle 200, and the second pressure plate subassembly 400 can be located on the front side of the welding needle 200, so that the first pressure plate subassembly 300, the second pressure plate subassembly 400 and the welding needle 200 are triangularly arranged. Of course, it can be imagined that in other embodiments, the first pressure plate subassembly 300 can also be located on the left side of the welding needle 200, and the second pressure plate subassembly 400 can be located on the rear side or the front side of the welding needle 200.

[0030] Referring to Figure 1 , Figure 4 and Figure 5 In the stirring friction welding device provided by the utility model, the first pressure plate subassembly 300, the second pressure plate subassembly 400 and the welding needle 200 are triangularly arranged, so that when the stirring friction welding device welds the corner of the work piece 500, one of the first pressure plate subassembly 300 and the second pressure plate subassembly 400 can press the work piece 500, preventing the work piece 500 from being raised at the corner, thereby ensuring the welding quality of the corner of the work piece 500.

[0031] Referring to Figure 4 and Figure 5In some embodiments, when the friction stir welding device is welding, the first pressure plate assembly 300 can be located at the front side of the welding pin 200 and press against the edge of the workpiece 500 along the welding direction, and the second pressure plate assembly 400 can be located at the side of the welding pin 200 close to the middle position of the workpiece 500. During the process of welding the corner of the workpiece 500, the welding head 100 drives the first pressure plate assembly 300 and the second pressure plate assembly 400 to rotate with the corner. During this process, the first pressure plate assembly 300 is out of the position of the workpiece 500, but the second pressure plate assembly 400 still abuts against the workpiece 500, thereby preventing the workpiece 500 from being raised at the corner and ensuring the welding quality at the corner of the workpiece 500. Of course, it can be imagined that in other embodiments, the second pressure plate assembly 400 can be located at the front side of the welding pin 200, and the first pressure plate assembly 300 can be located at the side of the welding pin 200 close to the middle position of the workpiece 500 when the friction stir welding device is welding.

[0032] Referring to Figure 1 and Figure 2 , according to some embodiments of the present application, the first pressure plate assembly 300 comprises a first mounting frame 310 and a first pressure roller 320 for pressing against the workpiece 500, the first mounting frame 310 is mounted on the welding head 100, and the first pressure roller 320 is rotatably mounted on the first mounting frame 310. The first mounting frame 310 is used to lift the first pressure roller 320 along the axial direction of the welding pin 200. The second pressure plate assembly 400 comprises a second mounting frame 410 and a second pressure roller 420 for pressing against the workpiece 500, the second mounting frame 410 is mounted on the welding head 100, and the second pressure roller 420 is rotatably mounted on the second mounting frame 410. The second pressure roller 420, the first pressure roller 320 and the welding pin 200 are arranged in a triangular shape. The second pressure roller 420 is smaller than the first pressure roller 320. Therefore, in the specific implementation process, it can be easier to make the distance between the second pressure roller 420 and the welding pin 200 smaller than the distance between the first pressure roller 320 and the welding pin 200. Thus, during the welding process, the second pressure roller 420 can abut against the position of the workpiece 500 closer to the welding position of the welding pin 200. When the corner of the workpiece 500 is being welded, the position change range of the second pressure roller 420 is small, thereby avoiding the situation that the first pressure roller 320 and the second pressure roller 420 are out of the range of the workpiece 500 at the same time.

[0033] When the friction stir welding device is welding, as shown in Figure 4 , the friction stir welding device can weld one edge of the workpiece 500 in the clockwise direction. The welding route is shown by the annular dashed line in Figure 4 . During the process of welding the corner of the workpiece 500, the welding head 100 drives the first pressure plate assembly 300 and the second pressure plate assembly 400 to rotate in the clockwise direction with the corner. Of course, as shown in Figure 5As shown, the friction stir welding device can also weld one edge of the workpiece 500 in the counterclockwise direction, and the welding route is shown as a counterclockwise annular dashed line. Figure 5 As shown in the annular dashed line in the welding process of the corner of the workpiece 500, the welding head 100 drives the first clamp plate assembly 300 and the second clamp plate assembly 400 to rotate in the counterclockwise direction along the corner. It is not difficult to see that the welding direction is different, and the orientation of the second clamp plate assembly 400 relative to the first clamp plate assembly 300 is also different.

[0034] Referring to Figure 1 and Figure 3 Therefore, in some embodiments, a position adjusting structure is provided between the welding head 100 and the second mounting bracket 410, and the position adjusting structure is used to adjust the mounting position of the second mounting bracket 410 around the axis of the welding pin 200. Therefore, by adjusting the mounting position of the second mounting bracket 410 through the position adjusting structure, the position of the second clamp plate assembly 400 is adjusted, so that the orientation of the second clamp plate assembly 400 relative to the first clamp plate assembly 300 can meet the needs of the friction stir welding device when welding in different welding directions.

[0035] Referring to Figure 1 and Figure 3 According to some embodiments of the present application, the welding head 100 comprises a head body 110 and a head cover 120, the head cover 120 is rotatably sleeved on one end of the head body 110, the welding pin 200 is rotatably mounted on one end of the head body 110, the position adjusting structure comprises the head cover 120 and at least one locking bolt 130, one of the head cover 120 and the welding head 100 is provided with at least two mounting holes 111 arranged circumferentially around the axis of the welding pin 200, and the other mounting hole 111 is provided with a locking bolt 130, each locking bolt 130 can be screwed with any one of the mounting holes 111, and the second mounting bracket 410 is connected to the head cover 120. Therefore, the head cover 120 can be fixed to the head body 110 by the locking bolt 130, when it is necessary to adjust the position of the second mounting bracket 410, the locking bolt 130 can be loosened, then the head cover 120 is rotated to the desired position, and the head cover 120 is fixed to the head body 110 again by the locking bolt 130.

[0036] Of course, in other embodiments, the position adjusting structure can also be arranged in other ways, for example, the welding head 100 is arranged with a plurality of mounting positions circumferentially around the axis of the welding pin 200, and the position adjusting structure comprises a locking bolt 130 and a mounting hole 111 arranged in the mounting position. In this way, the second mounting bracket 410 can be fixed to the mounting hole 111 of different mounting positions by the locking bolt 130, so as to adjust the position of the second mounting bracket 410.

[0037] Referring to Figure 1 and Figure 2According to some embodiments of the present application, the second mounting frame 410 comprises a fixing member 411, a sliding member 412 and a reset structure 413, the fixing member 411 is mounted on the welding head 100, the sliding member 412 is mounted on the fixing member 411 and can slide along the axial direction of the welding pin 200, the second pressure roller 420 is rotatably mounted on one end of the sliding member 412 away from the fixing member 411, and the reset structure 413 is used for driving the sliding member 412 to slide towards the second pressure roller 420. By the above arrangement, during the process of welding the workpiece 500 by the friction stir welding device, the second pressure roller 420 can slide along the ups and downs on the surface of the workpiece 500, the frictional damage between the second pressure roller 420 and the workpiece 500 is reduced, and meanwhile, the second pressure roller 420 can effectively press against the workpiece 500, so as to ensure the welding quality.

[0038] With reference to Figure 1 and Figure 2 According to some embodiments of the present application, the fixing member 411 and the sliding member 412 are arranged along the axis of the welding pin 200, the sliding member 412 is connected with a guide rod 414, one end of the guide rod 414 is slidably arranged in the fixing member 411, the guide rod 414 is provided with a limiting portion 415 for limiting the guide rod 414 from being separated from the fixing member 411, and the reset structure 413 comprises a reset spring, the reset spring is sleeved on the guide rod 414, and the reset spring abuts against the fixing member 411 and the sliding member 412. Thus, the reset spring can drive the sliding member 412 to slide towards the second pressure roller 420. By the above arrangement, the whole second pressure plate assembly 400 is simple in structure and convenient to install.

[0039] It should be noted that the reset structure 413 can also be arranged in other manners, for example, the reset structure 413 comprises two magnets which generate repulsive force in cooperation, the two magnets are correspondingly mounted on the sliding member 412 and the fixing member 411. Thus, the two magnets can replace the reset spring to drive the sliding member 412 to slide towards the second pressure roller 420.

[0040] It can be imagined that the sliding member 412 can also be slidably mounted on the fixing member 411 in other manners, for example, the sliding member 412 can be slidably mounted on the fixing member 411 through a second guide rail structure.

[0041] According to some embodiments of the present application, the fixing member 411 is mounted on the welding head 100 through bolts. Thus, the second pressure plate assembly 400 can be integrally disassembled, so as to facilitate replacement of the second pressure plate assembly 400 in the later period.

[0042] According to some embodiments of the present application, the second pressure roller 420 is connected to the second mounting frame 410 in a universal manner, so as to further reduce the frictional damage between the second pressure roller 420 and the workpiece 500.

[0043] In some embodiments, the second pressing wheel 420 can be rotatably installed on the second mounting frame 410 through a cross-shaped universal rotation connecting structure, so that the second pressing wheel 420 can rotate universally relative to the second mounting frame 410.

[0044] In other embodiments, the second pressing wheel 420 can also be provided in a spherical shape, and the second mounting frame 410 is provided with a ball socket, and the second pressing wheel 420 is installed in the ball socket, so that the second pressing wheel 420 can rotate universally relative to the second mounting frame 410.

[0045] Referring to Figure 1 and Figure 3 According to some embodiments of the present application, the first mounting frame 310 comprises a base 311, a driver 312 and a pull rod 313, the base 311 is installed on the welding head 100, the driver 312 is installed on the base 311, the pull rod 313 is slidably installed on the base 311 through a first guide rail structure 314, the pull rod 313 is connected with the driver 312, the driver 312 is used to drive the pull rod 313 to slide along the axial direction of the welding pin 200, and the first pressing wheel 320 is installed on the pull rod 313. Thus, during the process of the friction stir welding device welding the corner of the workpiece 500, the first pressing wheel 320 can be lifted by the driver 312 before it exceeds the range of the workpiece 500, and after the first pressing wheel 320 returns to the range of the workpiece 500, the driver 312 can lower the first pressing wheel 320 again to make the first pressing wheel 320 press the workpiece 500 again.

[0046] Referring to Figure 1 and Figure 3 According to some embodiments of the present application, the pull rod 313 is connected with a pressing rod 315, the pressing rod 315 is provided in an inclined manner relative to the pull rod 313, and the first pressing wheel 320 is rotatably installed on one end of the pressing rod 315 away from the driver 312. In this embodiment, the pressing rod 315 has a certain elasticity, so that the first pressing wheel 320 can be lifted and lowered along with the ups and downs on the surface of the workpiece 500, thereby reducing the frictional damage between the first pressing wheel 320 and the workpiece 500, and at the same time ensuring that the first pressing wheel 320 effectively presses the workpiece 500 to ensure the welding quality.

[0047] It can be imagined that in other embodiments, the first mounting frame 310 can also adopt an automatic telescopic structure, and the specific arrangement mode can refer to the second mounting frame 410.

[0048] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0049] The utility model embodiment makes the detailed explanation in combination with the drawing, but the utility model is not limited to the above -mentioned embodiment, still can make various changes in the knowledge range of ordinary skill in the art person who has possessed under the premise of not departing from the utility model tenet.

Claims

1. A friction stir welding apparatus characterized by comprising: The utility model relates to a welding head (100) rotatably installed with a welding needle (200) at one end, a first pressure plate assembly (300) for pressing a workpiece (500), the first pressure plate assembly (300) being installed on the welding head (100), a second pressure plate assembly (400) for pressing the workpiece (500), the second pressure plate assembly (400) being installed on the welding head (100), wherein the first pressure plate assembly (300), the second pressure plate assembly (400) and the welding needle (200) are arranged in a triangular shape. The first pressure plate assembly (300) comprises a first mounting frame (310) installed on the welding head (100) and a first pressure roller (320) for pressing the workpiece (500), the first pressure roller (320) being rotatably installed on the first mounting frame (310); the second pressure plate assembly (400) comprises a second mounting frame (410) installed on the welding head (100) and a second pressure roller (420) for pressing the workpiece (500), the second pressure roller (420) being rotatably installed on the second mounting frame (410), wherein the second pressure roller (420), the first pressure roller (320) and the welding needle (200) are arranged in a triangular shape, the second pressure roller (420) is smaller than the first pressure roller (320), and the distance between the second pressure roller (420) and the welding needle (200) is smaller than the distance between the first pressure roller (320) and the welding needle (200). A position adjustment structure is arranged between the welding head (100) and the second mounting frame (410), the position adjustment structure being used to adjust the mounting position of the second mounting frame (410) around the axis of the welding needle (200). The welding head (100) comprises a head body (110) and a head cover (120), the head cover (120) being rotatably sleeved on one end of the head body (110), the welding needle (200) being rotatably installed on one end of the head body (110), the position adjustment structure comprising the head cover (120) and at least one locking bolt (130), one of the head cover (120) and the welding head (100) being provided with at least two mounting holes (111) arranged circumferentially around the axis of the welding needle (200), the other mounting the locking bolt (130), each locking bolt (130) being capable of being screwed with any one of the mounting holes (111), and the second mounting frame (410) being connected to the head cover (120).

2. A friction stir welding apparatus as claimed in claim 1, wherein ​ 3. A friction stir welding apparatus as claimed in claim 2, wherein ​ 4. A friction stir welding apparatus as claimed in claim 3, wherein ​ 5. A friction stir welding apparatus as claimed in claim 2, wherein The second mounting frame (410) comprises a fixing member (411), a sliding member (412) and a reset structure (413), the fixing member (411) is mounted on the welding head (100), the sliding member (412) is mounted on the fixing member (411) and can slide along the axial direction of the welding needle (200), the second pressing wheel (420) is rotatably mounted on one end of the sliding member (412) away from the fixing member (411), and the reset structure (413) is used for driving the sliding member (412) to slide towards the second pressing wheel (420).

6. A friction stir welding apparatus as claimed in claim 5, wherein The fixing member (411) and the sliding member (412) are arranged along the axis of the welding needle (200), the sliding member (412) is connected with a guide rod (414), one end of the guide rod (414) is slidably arranged in the fixing member (411), the guide rod (414) is provided with a limiting portion (415) for limiting the guide rod (414) from being separated from the fixing member (411), and the reset structure (413) comprises a reset spring, the reset spring is sleeved on the guide rod (414), and the reset spring abuts against the fixing member (411) and the sliding member (412).

7. A friction stir welding apparatus as claimed in claim 5, wherein The fixing member (411) is mounted on the welding head (100) by means of bolts.

8. A friction stir welding apparatus as claimed in claim 5, wherein The second pressing wheel (420) is connected to the second mounting frame (410) in a universal manner.

9. A friction stir welding apparatus as claimed in claim 2, wherein The first mounting frame (310) comprises a base (311), a driver (312) and a pull rod (313), the base (311) is mounted on the welding head (100), the driver (312) is mounted on the base (311), the pull rod (313) is slidably mounted on the base (311) through a first guide rail structure (314), the pull rod (313) is connected with the driver (312), the driver (312) is used for driving the pull rod (313) to slide along the axial direction of the welding needle (200), and the first pressing wheel (320) is mounted on the pull rod (313).

10. A friction stir welding apparatus as claimed in claim 9, wherein The pull rod (313) is connected with a pressing rod (315), the pressing rod (315) is arranged in an inclined manner relative to the pull rod (313), and the first pressing wheel (320) is rotatably mounted on one end of the pressing rod (315) away from the driver (312).

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