Friction stir welding equipment

Abstract

The invention relates to the technical field of friction stir welding, and discloses friction stir welding equipment which comprises a friction welding equipment body, a movable rack, an upper friction stir welding piece and a lower friction stir welding piece. The movable machine frame is installed on the friction welding equipment body, a cavity is formed in the friction welding equipment body, a welding opening communicated with the cavity is formed in a table top of the friction welding equipment body, a first loading frame and a second loading frame which are arranged up and down are installed on the movable machine frame, and the upper stirring welding piece is installed on the first loading frame. The lower stirring welding piece is installed on the second loading frame, the upper stirring welding piece is located above the table top of the friction welding equipment body, and the lower stirring welding piece is located in the cavity. The welding efficiency and quality are improved through bilateral stirring welding, heat dissipation balance is improved and oxygen is isolated through protective gas, the thick frame workpiece is preheated in combination with hot oil circulation, welding scraps are extracted in real time, the welding quality is effectively improved, and defects are reduced.

Description

Technical Field

[0001] This invention relates to the field of friction stir welding technology, and more particularly to a friction stir welding device. Background Technology

[0002] In traditional battery tray frame manufacturing technology, a one-piece casting method is usually used to produce the entire frame as a whole. However, this one-piece casting of battery tray frames has some drawbacks. Due to its large size, the casting equipment also needs to be correspondingly larger, and the customization requirements in the production process are more complex, and the production cycle is extended. To solve this problem, the battery tray frame can be divided into multiple parts. During assembly, friction stir welding equipment is used to weld the joints between the frames. The friction stir welding equipment drives a motor equipped with stirring needles to move flexibly in the up-down, back-and-forth, and left-and-right directions through the frame, so that the stirring needles can act on the joints of the frames. Under the drive of the motor, the stirring needles stir and rub at the joints, thereby achieving the welding between the frames.

[0003] In traditional friction stir welding technology, friction stir welding equipment is usually equipped with only a single stirring pin, which can only perform welding operations on one side of the frame workpiece. Due to the limited heat input capacity of a single stirring pin, it is difficult to ensure that the central area of ​​the frame plate achieves sufficient plastic flow during the welding process. This makes the welding area prone to defects such as incomplete penetration, holes, and poor connection, thereby reducing the welding quality.

[0004] To address the aforementioned problems, this application proposes a friction stir welding device. Summary of the Invention

[0005] This invention proposes a friction stir welding device that solves the problem that traditional friction stir welding devices in related technologies are only equipped with a single stirring needle, can only weld on one side, have limited heat input, and are difficult to fully plasticize and flow the material in the center of the frame connection, which easily leads to defects such as incomplete penetration, holes and poor connection, thus reducing the welding quality.

[0006] The present invention proposes a friction stir welding device, comprising a friction stir welding device body, a movable frame, an upper stirring welding component and a lower stirring welding component;

[0007] The mobile frame is installed on the main body of the friction welding equipment. The main body of the friction welding equipment has a cavity, and the table surface of the main body of the friction welding equipment has a welding port communicating with the cavity. The mobile frame is equipped with a first loading frame and a second loading frame arranged vertically. The upper stirring welding component is installed on the first loading frame, and the lower stirring welding component is installed on the second loading frame. The upper stirring welding component is located above the table surface of the friction welding equipment, and the lower stirring welding component is located inside the cavity.

[0008] The lower stirring welding component is equipped with an air blowing assembly that blows protective gas toward its welding end, and a chip extraction assembly that extracts welding waste chips.

[0009] As a further optimization of the present invention, the upper stirring welding component includes an upper motor and an upper stirring welding head. The upper motor is mounted on the first loading frame and located above the table surface of the friction welding equipment body. The output end of the upper motor is connected to the upper stirring welding head.

[0010] As a further optimization of the present invention, the lower stirring welding component includes a lower motor, a lower stirring welding head, and a cover. The lower motor is mounted on the second loading frame and located in the cavity of the friction welding equipment body. The output end of the lower motor is connected to the lower stirring welding head that is directly opposite the upper stirring welding head. A cover is mounted on the lower motor and covers the outer periphery of the bottom of the lower stirring welding head. The air blowing assembly and the chip extraction assembly are both mounted on the cover.

[0011] As a further optimization of the present invention, the air blowing assembly includes a loading shaft, an air blowing pipe, and an air blowing hood. The loading shaft is fixed to one side of the hood, the air blowing pipe is installed at the end of the loading shaft, the air blowing hood facing the top of the downward stirring head is installed at the top of the air blowing pipe, the end of the air blowing hood is connected to an air blowing head, and a guide pipe communicating with the air blowing pipe is installed on the loading shaft, and the guide pipe is used to connect to a protective gas supply device.

[0012] As a further optimization of the present invention, an outer tube is fitted around the outer periphery of the air blowing pipe, and a flow cavity is formed between the air blowing pipe and the outer tube. A heat-conducting component for conveying hot oil to the flow cavity is installed inside the air blowing hood, and an oil outlet pipe communicating with the flow cavity is connected to the bottom side of the outer tube.

[0013] As a further optimization of the present invention, the heat-conducting component includes a flow tube, which is installed inside the air blowing hood and is in a continuous bending shape. The liquid inlet end of the flow tube is connected to an oil inlet pipe, which is used to connect to an oil pump. The oil outlet end of the flow tube is connected to an oil outlet pipe, and one end of the oil outlet pipe passes through the outer periphery of the outer tube and communicates with the flow cavity.

[0014] As a further optimization of the present invention, the chip extraction assembly includes an edge chip extraction component and a center chip extraction component. The other side of the cover is connected to an edge chip extraction component facing the top of the lower stirring head. The center chip extraction component covers the outer periphery of the lower stirring head and is fixed between the outer tube and the edge chip extraction component, and the center chip extraction component and the edge chip extraction component are in communication.

[0015] As a further optimization of the present invention, the edge chip extraction component includes a chip extraction main pipe, the other side of the cover is fixed with the chip extraction main pipe, the top end of the chip extraction main pipe is connected to a chip extraction nozzle facing the top end of the downward stirring welding head, the bottom side of the chip extraction main pipe is connected to a chip extraction hose, and the chip extraction hose is used to connect to a chip extraction pump, and the center chip extraction component is connected to the chip extraction main pipe.

[0016] As a further optimization of the present invention, the central chip extraction component includes an annular tube, an assembly rod, and a connecting tube. The outer tube and the chip extraction main tube are each fixed with an assembly rod on their adjacent sides. The annular tube is fixed between the two assembly rods and covers the outer periphery of the lower stirring welding head. The inner wall of the annular tube is connected with a plurality of circumferentially arranged chip extraction heads. The connecting tube is connected between the chip extraction main tube and the annular tube.

[0017] The above-described technical solution of the present invention has the following beneficial technical effects:

[0018] 1. Place the various frame components on the main body of the friction welding equipment to form an integral battery tray frame structure. Position the connection between adjacent components at the welding port on the main body of the friction welding equipment. Then, drive the upper and lower stirring welding components on the moving frame to simultaneously stir and weld the upper and lower parts of the frame connection. This design enables synchronous welding on both sides of the frame connection, which can improve welding efficiency and reduce welding time. At the same time, double-sided welding ensures that the upper and lower parts of the frame connection are fully plasticized and flowed, effectively avoiding defects such as incomplete penetration, holes, and poor connection that may occur in traditional single-stirring needle welding, thereby improving welding quality.

[0019] 2. Since the upper part of the frame connection is exposed and dissipates heat quickly, while the bottom often dissipates heat more slowly, when the bottom of the frame connection is being stirred, the protective gas can be blown down to the stirring position of the lower stirring component through the air blowing assembly. Specifically, the air guide pipe delivers the protective gas to the air blowing hood, and then the air blowing head on the air blowing hood blows the protective gas to the bottom of the frame connection. The above design delivers the protective gas to the bottom welding area through the air blowing assembly, which on the one hand accelerates the heat dissipation of this area, improves the heat dissipation balance between the upper and lower areas, and prevents the material properties from deteriorating due to overheating at the bottom. On the other hand, it creates a local gas protective atmosphere, effectively isolating oxygen, reducing oxidation during the welding process, and further improving the welding quality.

[0020] 3. When welding thicker frames, the heat-conducting component in the air blowing assembly can be connected to a heating oil supply system. The hot oil passes through the heat-conducting component and is then delivered to the flow chamber between the air blowing pipe and the outer pipe. It is then discharged through the oil outlet pipe, forming a circulation. When the protective gas passes through the air blowing pipe, the hot oil surrounding the air blowing pipe heats the inner wall of the air blowing pipe, thus heating the gas flowing inside. When the protective gas enters the air blowing hood, it passes through the outer periphery of the heat-conducting component, which heats the protective gas a second time. The heated protective gas is then blown through the air blowing head to the bottom of the frame connection, preheating the bottom of the frame connection and removing impurities attached to it. The above design, through the integration of a heating oil circulation system, can heat the blown low-temperature protective gas to the required temperature. The heated protective gas is then blown to the bottom of the part to be welded, achieving effective preheating of the thick frame workpiece. This helps to reduce the welding thermal gradient, reduce residual stress, and remove surface impurities before welding begins, further ensuring welding quality.

[0021] 4. When performing friction stir welding on the bottom of the frame connection using the lower stir welding component, the chip extraction component installed on the lower stir welding component can extract the welding debris in real time. This can promptly remove impurities such as burrs and debris generated during the welding process, preventing them from being drawn into or remaining in the weld and surrounding area. This avoids welding defects caused by impurities, ensures the cleanliness and internal quality of the weld, and also helps to maintain the cleanliness of the work area. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a friction stir welding device proposed in this invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of a friction stir welding device proposed in this invention;

[0024] Figure 3 For the present invention Figure 2 Overall front view;

[0025] Figure 4 This is a schematic diagram of the cooperative structure of the stirring welding component, the air blowing component and the chip extraction component under the present invention;

[0026] Figure 5 This is a schematic diagram of the mating structure of the air blowing component and the chip extraction component of the present invention;

[0027] Figure 6 This is a schematic diagram of the air blowing assembly of the present invention;

[0028] Figure 7 This is a schematic diagram of the mating structure of the air blowing hood and the heat-conducting component of the present invention;

[0029] Figure 8This is a schematic diagram of the structure of the chip removal component of the present invention.

[0030] Reference numerals: 1. Friction welding equipment body; 101. Weld joint; 2. Moving frame; 21. First loading frame; 22. Second loading frame; 3. Upper stirring welding component; 31. Upper motor; 32. Upper stirring welding head; 4. Lower stirring welding component; 41. Lower motor; 42. Lower stirring welding head; 43. Cover; 5. Air blowing assembly; 51. Loading shaft; 52. Air blowing pipe; 521. Air guide pipe; 53. Air blowing hood 531. Air blowing head; 54. Outer tube; 55. Heat-conducting component; 551. Flow tube; 552. Oil inlet tube; 553. Oil outlet tube; 56. Oil outlet tube; 6. Chip extraction assembly; 61. Edge chip extraction component; 611. Main chip extraction tube; 612. Chip extraction nozzle; 613. Chip extraction hose; 62. Center chip extraction component; 621. Annular tube; 6211. Chip extraction head; 622. Assembly rod; 623. Connecting tube. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0032] Example 1

[0033] like Figure 1-8 As shown, the present invention proposes a friction stir welding device, which includes a friction stir welding device body 1, a movable frame 2, an upper stirring welding component 3 and a lower stirring welding component 4;

[0034] The mobile frame 2 is installed on the friction welding equipment body 1. The friction welding equipment body 1 has a cavity, and the table surface of the friction welding equipment body 1 has a welding port 101 communicating with the cavity. The mobile frame 2 is equipped with a first loading frame 21 and a second loading frame 22 arranged vertically. The upper stirring welding component 3 is installed on the first loading frame 21, and the lower stirring welding component 4 is installed on the second loading frame 22. The upper stirring welding component 3 is located above the table surface of the friction welding equipment body 1, and the lower stirring welding component 4 is located inside the cavity.

[0035] The lower stirring welding component 4 is equipped with an air blowing assembly 5 that blows protective gas toward its welding end, and a chip extraction assembly 6 that extracts welding waste.

[0036] In use, the various frame components that make up the battery tray frame are placed on the main body 1 of the friction welding equipment, with the connection between adjacent components at the welding port 101. The moving frame 2 can drive the first loading frame 21 and the second loading frame 22 to respectively move the upper stirring welding component 3 and the lower stirring welding component 4 to the upper and lower parts of the frame connection. The upper stirring welding component 3 performs friction stirring welding on the upper part of the frame connection above the table, while the lower stirring welding component 4 performs friction stirring welding on the lower part of the frame connection through the welding port 101 in the cavity. This design achieves synchronous welding on both sides of the frame connection, improving welding efficiency and reducing welding time. At the same time, double-sided welding ensures that the upper and lower parts of the frame connection are fully plasticized and flowed, effectively avoiding defects such as incomplete penetration, holes, and poor connection that may occur in traditional single stirring needle welding, thereby improving welding quality.

[0037] It should be noted that when welding the bottom of the frame connection through the lower stirring welding component 4, the air blowing component 5 delivers protective gas in a directional manner, which can not only isolate the air to prevent oxidation of the welding area, but also regulate the local temperature. During the welding process, the chip extraction component 6 extracts welding waste in real time to avoid impurities remaining and affecting the weld quality.

[0038] It should be further explained that:

[0039] Traditional friction stir welding equipment for welding battery tray frames typically uses a gantry crane. However, this gantry crane welding method can cause obstruction during the welding process. In this invention, the upper stirring welding component 3 and the first loading frame 21, as well as the lower stirring welding component 4 and the second loading frame 22, are all L-shaped. This allows the first loading component 21 to extend into the battery tray frame to be welded, enabling welding through the upper stirring welding component 3 without obstruction. Furthermore, the second loading frame 22, in conjunction with the lower stirring welding component 4, can weld the bottom of the battery tray to be welded, achieving a one-piece operation. This method is specifically designed for welding this type of battery tray frame.

[0040] In this embodiment, the upper stirring welding component 3 includes an upper motor 31 and an upper stirring welding head 32. The upper motor 31 is mounted on the first loading frame 21 and located above the table surface of the friction welding equipment body 1. The output end of the upper motor 31 is connected to the upper stirring welding head 32. When the moving frame 2 moves the upper stirring welding component 3 to the position above the frame connection, the upper motor 31 drives the upper stirring welding head 32 to rotate. During the rotation, the upper stirring welding head 32 generates friction with the material at the upper part of the frame connection, causing the local material to heat up and reach a plasticized state. Under pressure, the upper frame is connected and welded.

[0041] In this embodiment, the lower stirring welding component 4 includes a lower motor 41, a lower stirring welding head 42, and a cover 43. The lower motor 41 is mounted on the second loading frame 22 and located in the cavity of the friction welding equipment body 1. The output end of the lower motor 41 is connected to the lower stirring welding head 42, which is directly opposite to the upper stirring welding head 32. The cover 43, which covers the bottom outer periphery of the lower stirring welding head 42, is mounted on the lower motor 41. The air blowing component 5 and the chip extraction component 6 are both mounted on the cover 43.

[0042] The moving frame 2 moves the lower stirring welding part 4, so that the lower stirring welding head 42 passes through the welding port 101 to the position where the lower part of the frame connection is directly opposite the upper stirring welding head 32. The lower motor 41 drives the lower stirring welding head 42 to rotate, stirring and rubbing the lower part of the material at the frame connection, plasticizing the lower material and achieving connection.

[0043] Example 2

[0044] Since the upper part of the frame connection is exposed and dissipates heat quickly, while the bottom often dissipates heat more slowly, a structure for blowing protective gas onto the bottom connection of the frame is incorporated into the welding process, based on Embodiment 1, as follows:

[0045] In this embodiment, the air blowing assembly 5 includes a loading shaft 51, an air blowing pipe 52, and an air blowing cover 53. The loading shaft 51 is fixed to one side of the cover 43. The air blowing pipe 52 is installed at the end of the loading shaft 51. The air blowing cover 53 facing the top of the downward stirring head 42 is installed at the top of the air blowing pipe 52. An air blowing head 531 is connected to the end of the air blowing cover 53. A guide pipe 521 communicating with the air blowing pipe 52 is installed on the loading shaft 51, and the guide pipe 521 is used to connect to a protective gas supply device.

[0046] During the welding process, the shielding gas supply device delivers shielding gas to the blowing pipe 52 through the gas guide pipe 521. The shielding gas rises along the blowing pipe 52 into the blowing hood 53, and then is blown directionally downwards through the blowing head 531 to the bottom position of the frame connection where the stirring welding head 42 is welding. On the one hand, the blowing of shielding gas accelerates the heat dissipation of the bottom welding area and improves the heat dissipation balance between the upper and lower areas of the frame connection. On the other hand, the shielding gas forms a local gas protective atmosphere in the welding area, effectively isolating oxygen, reducing oxidation during the welding process, avoiding welding defects caused by oxidation, and further improving the welding quality.

[0047] In this embodiment, an outer tube 54 is fitted around the outer periphery of the air blowing pipe 52, and a flow cavity is formed between the air blowing pipe 52 and the outer tube 54. A heat-conducting component 55 is installed inside the air blowing hood 53 to transport hot oil to the flow cavity. An oil outlet pipe 56 communicating with the flow cavity is connected to the bottom side of the outer tube 54.

[0048] When welding thicker frames, the heat-conducting component 55 is connected to a heating oil supply device. The hot oil is then transported through the heat-conducting component 55 to the flow chamber between the air blowing pipe 52 and the outer pipe 54, and finally discharged through the oil outlet pipe 56 to form a circulation. The hot oil flows in the flow chamber, transferring heat to the air blowing pipe 52. When the protective gas passes through the air blowing pipe 52, the hot oil surrounding the air blowing pipe 52 heats the inner wall of the air blowing pipe 52, achieving the initial heating of the internally flowing gas. When the protective gas enters the air blowing hood 53, it passes through the outer periphery of the heat-conducting component 55 again, and the heat-conducting component 55 heats the protective gas a second time. The heated protective gas is then blown through the air blowing head 531 to the bottom of the frame connection, achieving preheating of the bottom of the frame connection and removing impurities attached to the bottom. This design helps to reduce the welding thermal gradient, reduce residual stress, and remove surface impurities before welding begins, further ensuring welding quality. It is suitable for welding thick and large frame workpieces.

[0049] In this embodiment, the heat-conducting component 55 includes a flow pipe 551, which is installed inside the air blowing hood 53 and is in a continuous bent shape. The liquid inlet end of the flow pipe 551 is connected to an oil inlet pipe 552, which is used to connect to an oil pump. The oil outlet end of the flow pipe 551 is connected to an oil outlet pipe 553, and one end of the oil outlet pipe 553 passes through the outer periphery of the outer pipe 54 and communicates with the flow cavity.

[0050] The oil pump delivers hot oil through the inlet pipe 552 into the continuously bent flow pipe 551. As the hot oil flows within the flow pipe 551, it transfers heat to the surrounding environment, thereby heating the protective gas passing through the air blowing hood 53. Finally, the hot oil is discharged through the outlet pipe 553 and enters the flow cavity between the air blowing pipe 52 and the outer pipe 54, continuing to participate in the heating process of the air blowing pipe 52. This bent flow pipe 551 design increases the contact area between the hot oil and the surrounding environment, improves the heat exchange efficiency, and allows the protective gas to absorb heat more fully, achieving a better preheating effect and helping to improve the welding quality of thick frame workpieces.

[0051] Example 3

[0052] In order to clean up the waste and burrs generated during welding in real time, a chip extraction structure was designed based on Example 1, as follows:

[0053] In this embodiment, the chip removal assembly 6 includes an edge chip removal component 61 and a center chip removal component 62. The other side of the cover 43 is connected to the edge chip removal component 61 facing the top of the lower stirring head 42. The center chip removal component 62 covers the outer periphery of the lower stirring head 42 and is fixed between the outer tube 54 and the edge chip removal component 61. The center chip removal component 62 is connected to the edge chip removal component 61.

[0054] When the lower stirring head 42 performs friction stir welding on the bottom of the frame connection, impurities such as burrs and debris are generated. The edge chip extractor 61 and the center chip extractor 62 work together. The edge chip extractor 61 sucks up the impurities from the edge of the welding area from the side, while the center chip extractor 62 covers the outer periphery of the lower stirring head 42 and sucks up the impurities generated in the center area of ​​the welding. The two work together to completely remove the impurities generated during the welding process, prevent impurities from being drawn into or remaining in the weld and surrounding area, ensure the cleanliness and internal quality of the weld, and also help to keep the working area clean.

[0055] In this embodiment, the edge chip extraction component 61 includes a chip extraction main tube 611, and the chip extraction main tube 611 is fixed on the other side of the cover 43. The top end of the chip extraction main tube 611 is connected to a chip extraction nozzle 612 facing the top end of the downward stirring welding head 42. The bottom side of the chip extraction main tube 611 is connected to a chip extraction hose 613, and the chip extraction hose 613 is used to connect to a chip extraction pump. The center chip extraction component 62 is connected to the chip extraction main tube 611.

[0056] The chip extraction pump generates suction force through the chip extraction hose 613, creating a negative pressure inside the chip extraction main pipe 611. The chip extraction nozzle 612 faces the top of the downward stirring welding head 42. Under the action of negative pressure, impurities such as burrs and chips generated at the edge of the welding area during the welding process are sucked into the chip extraction nozzle 612 and then drawn away along the chip extraction main pipe 611 and the chip extraction hose 613. This design can quickly remove impurities from the welding edge area, ensuring the cleanliness of the welding edge area and avoiding the adverse effects of impurities on the welding quality.

[0057] In this embodiment, the central chip extraction component 62 includes an annular tube 621, an assembly rod 622, and a connecting tube 623. Assembly rods 622 are fixed to both the outer tube 54 and the adjacent side of the main chip extraction tube 611. The annular tube 621 is fixed between two assembly rods 622 and covers the outer periphery of the lower stirring head 42. Multiple circumferentially arranged chip extraction heads 6211 are connected to the inner wall of the annular tube 621. The connecting tube 623 connects the main chip extraction tube 611 and the annular tube 621. The suction force generated by the chip extraction pump during operation passes through the main chip extraction tube 611 and the connecting tube 623. The pressure is transferred from pipe 623 to the annular pipe 621, creating a negative pressure inside the annular pipe 621. Since the annular pipe 621 covers the outer periphery of the lower stirring head 42 and has multiple circumferentially arranged chip extraction heads 6211 connected to its inner wall, these chip extraction heads 6211 can extract impurities generated in the welding center area around the lower stirring head 42 from different directions. The synergistic effect of multiple chip extraction heads 6211 ensures the removal of impurities in the welding center area, further guaranteeing the cleanliness of the weld center area, reducing welding defects caused by impurities, and improving welding quality.

[0058] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. A friction stir welding apparatus characterized by comprising: The friction welding device body (1), the moving frame (2), the upper stirring welding part (3) and the lower stirring welding part (4) are included. The moving frame (2) is installed on the friction welding device body (1), a cavity is formed in the friction welding device body (1), and a welding port (101) is formed in the table top of the friction welding device body (1) and communicates with the cavity; the first loading frame (21) and the second loading frame (22) are arranged above and below the moving frame (2); the upper stirring welding part (3) is installed on the first loading frame (21), and the lower stirring welding part (4) is installed on the second loading frame (22); the upper stirring welding part (3) is located above the table top of the friction welding device body (1), and the lower stirring welding part (4) is located in the cavity. The lower stirring welding part (4) is provided with a gas blowing assembly (5) for blowing protective gas to the welding end of the lower stirring welding part (4), and the lower stirring welding part (4) is provided with a scrap blowing assembly (6) for blowing welding scrap.

2. A friction stir welding apparatus as claimed in claim 1, wherein The upper stirring welding part (3) comprises an upper motor (31) and an upper stirring welding head (32); the upper motor (31) is installed on the first loading frame (21) and located above the table top of the friction welding device body (1); and the output end of the upper motor (31) is connected with the upper stirring welding head (32).

3. A friction stir welding apparatus as claimed in claim 2, wherein The lower stirring welding part (4) comprises a lower motor (41), a lower stirring welding head (42) and a cover (43); the lower motor (41) is installed on the second loading frame (22) and located in the cavity of the friction welding device body (1); the output end of the lower motor (41) is connected with the lower stirring welding head (42) which is opposite to the upper stirring welding head (32); the cover (43) is installed on the lower motor (41) and covers the outer circumferential region of the bottom of the lower stirring welding head (42); and the gas blowing assembly (5) and the scrap blowing assembly (6) are both installed on the cover (43).

4. A friction stir welding apparatus as claimed in claim 3, wherein The gas blowing assembly (5) comprises a loading shaft (51), a gas blowing pipe (52) and a gas blowing cover (53); one side of the cover (43) is fixed with the loading shaft (51); the end of the loading shaft (51) is installed with the gas blowing pipe (52); the top end of the gas blowing pipe (52) is installed with the gas blowing cover (53) which faces the top end of the lower stirring welding head (42); the end of the gas blowing cover (53) is connected with a gas blowing head (531); the loading shaft (51) is installed with a gas guide pipe (521) which communicates with the gas blowing pipe (52) and is used for connecting a protective gas device.

5. A friction stir welding apparatus as claimed in claim 4, wherein The outer circumferential region of the gas blowing pipe (52) is sleeved with an outer pipe (54), and a flow cavity is formed between the gas blowing pipe (52) and the outer pipe (54); the gas blowing cover (53) is installed with a heat conducting part (55) which delivers hot oil into the flow cavity; and the bottom side of the outer pipe (54) is connected with an oil outlet pipe (56) which communicates with the flow cavity.

6. A friction stir welding apparatus as claimed in claim 5, wherein The heat conducting member (55) comprises a flow pipe (551) which is installed in the blowing cover (53) and has a continuous bending shape, the flow pipe (551) is connected with an oil inlet pipe (552) at an inlet end, and the oil inlet pipe (552) is used to be connected with an oil pump, the flow pipe (551) is connected with an oil outlet pipe (553) at an outlet end, and one end of the oil outlet pipe (553) penetrates through the outer periphery of the outer pipe (54) and communicates with the flow cavity.

7. A friction stir welding apparatus as claimed in claim 5, wherein The scrap removing assembly (6) comprises an edge scrap removing part (61) and a center scrap removing part (62), the other side of the cover (43) is connected with the edge scrap removing part (61) which faces the top end of the lower stirring welding head (42), the center scrap removing part (62) is covered on the outer periphery of the lower stirring welding head (42) and is fixed between the outer pipe (54) and the edge scrap removing part (61), and the center scrap removing part (62) communicates with the edge scrap removing part (61).

8. A friction stir welding apparatus as claimed in claim 7, wherein The edge scrap removing part (61) comprises a scrap removing main pipe (611), the other side of the cover (43) is fixed with the scrap removing main pipe (611), the top end of the scrap removing main pipe (611) is connected with a scrap removing nozzle (612) which faces the top end of the lower stirring welding head (42), the bottom side of the scrap removing main pipe (611) is connected with a scrap removing hose (613), and the scrap removing hose (613) is used to be connected with a scrap removing pump, and the center scrap removing part (62) communicates with the scrap removing main pipe (611).

9. A friction stir welding apparatus as claimed in claim 8, wherein The center scrap removing part (62) comprises an annular pipe (621), an assembling rod (622) and a connecting pipe (623), the assembling rod (622) is fixed on the side adjacent to the scrap removing main pipe (611) of the outer pipe (54), the annular pipe (621) is fixed between the two assembling rods (622), and the annular pipe (621) is covered on the outer periphery of the lower stirring welding head (42), the inner wall of the annular pipe (621) is connected with a plurality of scrap removing heads (6211) which are arranged in a circumferential direction, and the connecting pipe (623) is connected between the scrap removing main pipe (611) and the annular pipe (621).

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