Vehicle body profile device suitable for full friction stir welding

Abstract

The invention discloses a vehicle body profile device suitable for full friction stir welding. The vehicle body profile device comprises a circular top vehicle body profile assembly and a flat top vehicle body profile assembly. The dome vehicle body profile assembly comprises a dome module arranged on the upper portion. The dome module comprises a first profile arranged in the center and first profiles symmetrically arranged on the two sides. The male joint arranged at the end part of the first section bar is matched and welded with the female joint arranged at one end of any first section bar; the flat-top vehicle body profile assembly comprises a flat-top module arranged above the flat-top vehicle body profile assembly; the flat top module comprises a fourth section bar I arranged in the center and fourth section bars II symmetrically arranged on the two sides; and a male joint arranged at the end part of the fourth first profile is matched and welded with a female joint arranged at one end of any fourth second profile. Through planar butt joint of the male connector and the female connector, original continuous cambered surface welding is converted into segmented linear / planar welding, the problem that the angle of a traditional stirring head cannot be adjusted is avoided, and the bottleneck that dome profiles depend on other welding technologies in the traditional process is broken through.

Description

Technical Field

[0001] The invention relates to a vehicle body profile device suitable for full friction stir welding, belonging to the technical field of vehicle body profiles. Background Art

[0002] Friction stir welding is one of the main component joining technologies in the field of mechanical manufacturing. Its efficient, automated welding mode and excellent mechanical properties of welded joints have led to its widespread application in actual manufacturing. However, based on research on relevant patents and actual production experience, the existing technology has the following main drawbacks: 1. The shoulder of the traditional friction stir welding stirring head is a flat structure. At the same time, the complexity of the overall equipment makes it very difficult to adjust the angle of the stirring head, and it is impossible to weld curved profiles.

[0003] 2. Existing rail vehicle aluminum alloy body large profile welding, except for the roof dome profile, all adopt stir friction welding technology. Combined with the limitation that the traditional stir friction welding stirring head cannot adjust the angle, it is difficult to promote the idea of ​​using full stir friction welding technology for large vehicle components. As a result, it is difficult to further improve the automation level of vehicle manufacturing, affecting production efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a body profile device suitable for full stir friction welding. Through the planar docking of the male joint and the female joint, the original continuous arc surface welding is converted into segmented straight line / plane welding, avoiding the problem that the traditional stirring head cannot adjust the angle, and breaking through the bottleneck of the traditional process of dome profile relying on other welding technologies.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: The present invention provides a vehicle body profile device suitable for full friction stir welding, comprising a dome vehicle body profile assembly and a flat top vehicle body profile assembly; The dome vehicle body profile assembly includes a dome module disposed at the top; the dome module includes a first profile disposed at the center and first and second profiles disposed symmetrically on both sides; a male connector disposed at the end of the first profile is welded to a female connector disposed at one end of any one of the first and second profiles; The flat-top body profile assembly includes a flat-top module arranged on the top; the flat-top module includes a fourth-first profile arranged in the center and a fourth-second profile symmetrically arranged on both sides; the male connector arranged at the end of the fourth-first profile is welded to the female connector arranged at one end of any fourth-second profile.

[0006] Furthermore, the dome body profile assembly or the flat-top body profile assembly further includes side wall modules provided on both sides, wherein the side wall modules include a second first profile, a second second profile, a second third profile, a second fourth profile, and a second fifth profile connected in sequence from top to bottom; The female connector provided at the lower end of the second first profile is welded to the male connector provided at the upper end of the second second profile; The female connector provided at the lower end of the second-second profile is welded to the male connector provided at the upper end of the second-third profile; The female connector provided at the lower end of the second-third profile is welded to the male connector provided at the upper end of the second-fourth profile; The female connector provided at the lower end of the second-fourth profile is welded to the male connector provided at the upper end of the second-fifth profile.

[0007] Furthermore, the dome body profile assembly or the flat top body profile assembly further includes a chassis module provided at the bottom; The chassis module includes a third profile arranged in the center, and a third profile, a third profile and a third profile arranged in pairs. The male connector provided at the end of the third-first profile is welded to the female connector provided at one end of any third-second profile; The female connector provided at the other end of the third-second profile is welded to the male connector provided at one end of the third-third profile; The protruding end provided at the other end of the third profile is cooperatively connected with the protruding end provided at one end of the third profile; The clamping joint provided at the upper end of the third and fourth profiles is engaged with the clamping groove provided at the lower end of the second and fifth profiles.

[0008] Furthermore, the dome module further includes a first third profile and a first fourth profile arranged in pairs; the first third profile is arranged between the first second profile and the first fourth profile; The male connector provided at one end of the first-third profile is welded to the female connector provided at the other end of the first-second profile; the extended end provided at the other end of the first-third profile is connected to the extended end provided at one end of the first-fourth profile; the clamping connector provided at the other end of the first-fourth profile is clamped to the clamping groove provided at the upper end of the second-first profile; The first-first profile, the first-second profile, the first-third profile and the first-fourth profile are all arc-shaped structures.

[0009] Furthermore, the flat roof module further includes a fourth third profile and a fourth fourth profile arranged in pairs; The embedded end provided at one end of the fourth third profile is cooperatively connected with the extended end provided at the other end of the fourth second profile; The protruding end provided at the other end of the 43rd profile is cooperated and connected with the protruding end provided at one end of the 44th profile; the clamping joint provided at the other end of the 44th profile is cooperated and clamped with the clamping groove provided at the upper end of the 21st profile.

[0010] Furthermore, the end of the male connector away from any profile is provided with a plug-in boss, and the end of the male connector close to any profile is provided with a first profile cavity; the periphery of the male connector is provided with a first stirring boss; The end of the female connector away from any profile is provided with a plug-in groove, and the end of the female connector close to any profile is provided with a second profile cavity; the periphery of the female connector is provided with a second stirring boss; The plug-in boss of the male connector and the plug-in groove of the female connector are matched and connected.

[0011] Furthermore, the length of the plug-in boss of the male connector is smaller than the depth of the plug-in groove of the female connector.

[0012] Furthermore, the center line of the male connector is collinear with the center line of the female connector; and the outer surfaces of the first stirring boss and the second stirring boss are coplanar.

[0013] Furthermore, the plug-in boss of the male connector includes two symmetrically arranged extensions, and the angle formed by the two sides of the extensions ranges from 35° to 45°.

[0014] Furthermore, the difference between the width of the plug-in groove and the width of the plug-in boss ranges from 0.2 mm to 1.2 mm.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention's body profile device, suitable for full friction stir welding, splits the curved structure of the dome body into a central first profile and two flanking first and second profiles. Using planarized male and female connectors, this converts the original continuous arc weld into segmented linear / flat welds, circumventing the angle adjustment limitations of conventional mixing heads. Furthermore, the flat-top module utilizes the same male and female connector connection method as the dome module, ensuring consistent welding processes across different roof structures. This paves the way for the comprehensive adoption of friction stir welding for major vehicle components, breaking through the bottleneck of traditional dome profile welding processes that rely on other welding technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a dome vehicle body profile assembly provided by an embodiment of the present invention; Figure 2 1 is a schematic structural diagram of a flat-top vehicle body profile assembly provided by an embodiment of the present invention; Figure 3 is a structural schematic diagram of a first profile provided by an embodiment of the present invention; Figure 4 Schematic diagram of the structure of the first and second profiles provided in an embodiment of the present invention; Figure 5 Schematic diagram of the structure of the first and third profiles provided in an embodiment of the present invention; Figure 6 Schematic diagram of the structure of the first four profiles provided in an embodiment of the present invention; Figure 7 is a structural schematic diagram of a fourth profile provided by an embodiment of the present invention; Figure 8 is a structural schematic diagram of a forty-second profile provided in an embodiment of the present invention; Figure 9 is a schematic structural diagram of the fourth third profile provided in an embodiment of the present invention; Figure 10 is a structural schematic diagram of the fourth profile provided by an embodiment of the present invention; Figure 11 is a structural schematic diagram of a second profile provided by an embodiment of the present invention; Figure 12 is a structural schematic diagram of a second profile provided by an embodiment of the present invention; Figure 13 Schematic diagrams of the structures of the second and third profiles provided in the embodiments of the present invention; Figure 14 1 is a schematic structural diagram of the second fourth profile provided in an embodiment of the present invention; Figure 15 Schematic diagram of the structure of the twenty-fifth profile provided by an embodiment of the present invention; Figure 16 is a structural schematic diagram of a third profile provided by an embodiment of the present invention; Figure 17 is a structural schematic diagram of the third second profile provided by an embodiment of the present invention; Figure 18 1 is a schematic structural diagram of the third profile provided in an embodiment of the present invention; Figure 19 Schematic diagram of the structure of the third and fourth profiles provided in the embodiment of the present invention; Figure 20 1 is a schematic structural diagram of a male connector provided by an embodiment of the present invention; Figure 21 1 is a schematic structural diagram of a female connector provided by an embodiment of the present invention; Figure 22 This is a schematic structural diagram of the connection between a male connector and a female connector provided by an embodiment of the present invention; In the figure: 1. Dome module; 2. Side wall module; 3. Base frame module; 4. Flat top module; 5. Male connector; 6. Female connector; 11. First profile; 12. First second profile; 13. First third profile; 14. First fourth profile; 21. Second profile; 22. Second second profile; 23. Second third profile; 24. Second fourth profile; 25. Second fifth profile; 31. Third first profile; 32. Third second profile; 33. Third third profile; 34. Third fourth profile; 41. Fourth first profile; 42. Fourth second profile; 43. Fourth third profile; 44. Fourth fourth profile; 51. Insert boss; 52. First profile cavity; 53. First stirring boss; 61. Insert groove; 62. Second profile cavity; 63. Second stirring boss. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] This embodiment provides a vehicle body profile device suitable for full friction stir welding, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8 As shown, it includes a dome body section assembly and a flat top body section assembly; The dome body profile assembly includes a dome module 1 disposed at the top; the dome module 1 includes a first profile 11 disposed in the center and first and second profiles 12 disposed symmetrically on both sides; a male connector 5 disposed at the end of the first profile 11 is welded to a female connector 6 disposed at one end of any of the first and second profiles 12; The flat-top body profile assembly includes a flat-top module 4 arranged at the top; the flat-top module 4 includes a fourth-first profile 41 arranged in the center and a fourth-second profile 42 symmetrically arranged on both sides; the male connector 5 arranged at the end of the fourth-first profile 41 is welded with the female connector 6 arranged at one end of any fourth-second profile 42.

[0019] The technical concept of this invention lies in: firstly, splitting the arcuate structure of the dome body into a central first profile 11 and two flanking first and second profiles 12. Using planar joints 5 and 6, the previously continuous arc weld is converted into segmented linear / flat welds, thus avoiding the angle adjustment issues of conventional stir heads. Secondly, the flat roof module 4 utilizes the same male and female joint connection as the dome module 1, ensuring consistent welding processes across different roof structures. This paves the way for the comprehensive adoption of friction stir welding for major vehicle components, breaking through the bottleneck of traditional dome profile welding processes that rely on other welding techniques.

[0020] like Figure 11、 Figure 12 、 Figure 13 、 Figure 14 and Figure 15 As shown, the dome body profile assembly or the flat-top body profile assembly further includes side wall modules 2 provided on both sides, and the side wall modules 2 include a second-first profile 21, a second-second profile 22, a second-third profile 23, a second-fourth profile 24, and a second-fifth profile 25 connected sequentially from top to bottom; The female connector 6 provided at the lower end of the second first profile 21 is welded to the male connector 5 provided at the upper end of the second second profile 22; The female connector 6 provided at the lower end of the second-second profile 22 is welded to the male connector 5 provided at the upper end of the second-third profile 23; The female connector 6 provided at the lower end of the second-third profile 23 is welded to the male connector 5 provided at the upper end of the second-fourth profile 24; The female connector 6 provided at the lower end of the second-fourth profile 24 is welded to the male connector 5 provided at the upper end of the second-fifth profile 25 .

[0021] The side wall module 2 is decomposed into a second-first profile 21, a second-second profile 22, a second-third profile 23, a second-fourth profile 24 and a second-fifth profile 25, thereby avoiding deformation problems such as warping and shrinkage caused by heat concentration in traditional long welds.

[0022] In addition, precise alignment between different profiles is achieved through the plug-in cooperation of the female connector 6 and the male connector 5. No additional tooling is required for forced fixation during welding, which reduces local deformation caused by welding stress and ensures the overall flatness and assembly accuracy of the side wall.

[0023] like Figure 16 、 Figure 17 、 Figure 18 and Figure 19 As shown, the dome body section assembly or the flat top body section assembly further includes an underframe module 3 provided at the bottom; The chassis module 3 includes a third first profile 31 arranged in the center, and a third second profile 32, a third third profile 33 and a third fourth profile 34 arranged in pairs. The male connector 5 provided at the end of the third-first profile 31 is welded to the female connector 6 provided at one end of any third-second profile 32; The female connector 6 provided at the other end of the third-second profile 32 is welded to the male connector 5 provided at one end of the third-third profile 33; The protruding end provided at the other end of the third profile 33 is connected to the protruding end provided at one end of the third profile 34; The clamping joint provided at the upper end of the third-fourth profile 34 is engaged with the clamping groove provided at the lower end of the second-fifth profile 25 .

[0024] The chassis module 3 is centered around the third-first profile 31 and extends hierarchically from the third-second profile 32 to the third-third profile 33 to the third-fourth profile 34, forming a "tree-like" load transfer path. The longitudinal forces acting on the vehicle body are dispersed to both sides through the central profile, avoiding stress concentration and improving the chassis' torsional rigidity. The third-first and third-third profiles 31 and 33 are rigidly connected using friction stir welding to ensure strength in the primary load-bearing area. The third-third and third-fourth profiles 33 and 34 are semi-rigidly connected via plug-in and snap-fit ​​connections at their extended ends. The rigid zone absorbs steady-state loads, while the flexible zone buffers dynamic impacts such as track vibration, extending the chassis' fatigue life.

[0025] The third and fourth profiles 34 are connected to the second and fifth profiles 25 of the side wall by means of a card joint and a card slot, without welding. When the chassis is partially damaged, it can be quickly disassembled and replaced, reducing maintenance time.

[0026] like Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the dome module 1 further includes a first third profile 13 and a first fourth profile 14 arranged in pairs; the first third profile 13 is arranged between the first second profile 12 and the first fourth profile 14; The male connector 5 provided at one end of the first-third profile 13 is welded with the female connector 6 provided at the other end of the first-second profile 12; the protruding end provided at the other end of the first-third profile 13 is connected with the protruding end provided at one end of the first-fourth profile 14; the clamping connector provided at the other end of the first-fourth profile 14 is clamped with the clamping groove provided at the upper end of the second-first profile 21.

[0027] The first-first profile 11 , the first-second profile 12 , the first-third profile 13 and the first-fourth profile 14 are all arc-shaped structures.

[0028] The dome module 1 is assembled in sections to naturally form a continuous dome surface, avoiding curvature deviation or material damage caused by artificial bending of profiles. The first profile 11, the first second profile 12, and the first third profile 13 are friction stir welded to form a high-strength main load-bearing frame. The first fourth profile 14 is connected to the side wall module 2 via a snap-in joint-slot connection, allowing for slight deformation to buffer the vibration load of the vehicle body during operation while maintaining sealing. The hollow cavities of each curved profile are combined to form a coherent annular cavity structure, improving the roof's bending stiffness and compressive stability, and adapting to the aerodynamic loads during high-speed driving.

[0029] The clamping joints of the first four profiles 14 are pre-fixed with the clamping grooves of the side wall module 2 before welding, ensuring the arc docking accuracy of the roof and the side wall without the need for complex arc-shaped fixtures.

[0030] like Figure 7 、 Figure 8 、 Figure 9 and Figure 10As shown, the flat roof module 4 further includes a fourth third profile 43 and a fourth fourth profile 44 arranged in pairs; The embedded end provided at one end of the fourth-third profile 43 is cooperatively connected with the extended end provided at the other end of the fourth-second profile 42; The protruding end provided at the other end of the fourth-third profile 43 is matched and connected with the protruding end provided at one end of the fourth-fourth profile 44; the clamping joint provided at the other end of the fourth-fourth profile 44 is matched and clamped with the clamping groove provided at the upper end of the second-first profile 21.

[0031] like Figure 20 、 Figure 21 and Figure 22 As shown, the end of the male connector 5 away from any profile is provided with a plug-in boss 51, and the end of the male connector 5 close to any profile is provided with a first profile cavity 52; the periphery of the male connector 5 is provided with a first stirring boss 53; The end of the female connector 6 away from any profile is provided with a plug-in groove 61, and the end of the female connector 6 close to any profile is provided with a second profile cavity 62; the periphery of the female connector 6 is provided with a second stirring boss 63; The plug-in boss 51 of the male connector 5 and the plug-in groove 61 of the female connector 6 are matingly connected.

[0032] Furthermore, the length of the male connector 5's insertion boss 51 is shorter than the depth of the female connector 6's insertion groove 61. This shorter length of the insertion boss 51, which allows for a 0-0.5mm axial clearance, allows for thermal expansion of the profile during welding to be absorbed by this clearance, preventing deformation of the joint area due to thermal stress. Furthermore, the clearance between the insertion boss 51 and the insertion groove 61 allows for physical pre-positioning before welding, ensuring automatic centering of the two profile axes. This eliminates the drawback of traditional butt welding, which relies on manual adjustment, and is particularly suitable for high-precision robotic welding.

[0033] Furthermore, the centerline of the male connector 5 is collinear with the centerline of the female connector 6, and the outer surfaces of the first stirring boss 53 and the second stirring boss 63 are coplanar. During welding, the stirring head shoulder can simultaneously press the bosses on both sides to ensure that friction heat is evenly transferred to the joint interface.

[0034] The plug-in boss 51 of the male connector 5 includes two symmetrically arranged extensions, and the angle formed by the two sides of the extensions ranges from 35° to 45°.

[0035] The difference between the width of the plug-in groove 61 and the width of the plug-in boss 51 ranges from 0.2 mm to 1.2 mm.

[0036] It should be noted that to ensure the smooth implementation of friction stir welding, the outer surfaces of the first stirring boss 53 and the second stirring boss 63 should be coplanar and always parallel to each other, so as to ensure that the shoulder of the friction stir welding stirring head is tightly fitted with the outer surface of either stirring boss and provide solid support for the stirring head to be inserted into the welded joint. During the welding process, the plug-in boss 51 and the plug-in groove 61 should always be tightly fitted to ensure that both the male connector 5 and the female connector 6 are firmly supported during welding, thereby improving the welding quality while preventing deformation of the plug-in groove.

[0037] This device can be used in the friction stir welding of traditional car body non-radian profiles and the friction stir welding of curved profiles like roof domes, thereby facilitating the realization of the full friction stir welding process of large vehicle component profiles, saving process flow, improving the automation level of vehicle manufacturing, and increasing production efficiency.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle body profile device suitable for full friction stir welding, characterized in that: including a dome body section assembly and a flat top body section assembly; The dome vehicle body profile assembly comprises a dome module (1) arranged at the top; the dome module (1) comprises a first profile (11) arranged at the center and first and second profiles (12) symmetrically arranged on both sides; a male connector (5) arranged at the end of the first profile (11) is welded to a female connector (6) arranged at one end of any one of the first and second profiles (12); The flat-top vehicle body profile assembly comprises a flat-top module (4) arranged at the top; the flat-top module (4) comprises a fourth-first profile (41) arranged at the center and fourth-second profiles (42) symmetrically arranged on both sides; a male connector (5) arranged at the end of the fourth-first profile (41) is welded to a female connector (6) arranged at one end of any fourth-second profile (42).

2. The vehicle body profile device suitable for full friction stir welding according to claim 1, characterized in that: The dome vehicle body profile assembly or the flat-top vehicle body profile assembly further comprises side wall modules (2) provided on both sides, wherein the side wall modules (2) comprise a second first profile (21), a second second profile (22), a second third profile (23), a second fourth profile (24) and a second fifth profile (25) connected in sequence from top to bottom; The female connector (6) provided at the lower end of the second first profile (21) and the male connector (5) provided at the upper end of the second second profile (22) are welded together; The female connector (6) provided at the lower end of the second-second profile (22) and the male connector (5) provided at the upper end of the second-third profile (23) are welded together; The female connector (6) provided at the lower end of the second-third profile (23) and the male connector (5) provided at the upper end of the second-fourth profile (24) are welded together; The female connector (6) provided at the lower end of the second fourth profile (24) and the male connector (5) provided at the upper end of the second fifth profile (25) are welded together.

3. The vehicle body profile device suitable for full friction stir welding according to claim 2, characterized in that: The dome body profile assembly or the flat top body profile assembly further comprises an underframe module (3) arranged at the bottom; The chassis module (3) includes a third profile (31) arranged in the center, and a third profile (32), a third profile (33), and a third profile (34) arranged in pairs. The male connector (5) provided at the end of the third-first profile (31) is welded to the female connector (6) provided at one end of any third-second profile (32); The female connector (6) provided at the other end of the third-second profile (32) is welded to the male connector (5) provided at one end of the third-third profile (33); The protruding end provided at the other end of the third profile (33) is cooperatively connected with the protruding end provided at one end of the third profile (34); The clamping joint provided at the upper end of the third and fourth profiles (34) is engaged with the clamping groove provided at the lower end of the second and fifth profiles (25).

4. The vehicle body profile device suitable for full friction stir welding according to claim 3, wherein: The dome module (1) further comprises a first third profile (13) and a first fourth profile (14) arranged in pairs; the first third profile (13) is arranged between the first second profile (12) and the first fourth profile (14); The male connector (5) provided at one end of the first-third profile (13) is welded to the female connector (6) provided at the other end of the first-second profile (12); the extended end provided at the other end of the first-third profile (13) is connected to the extended end provided at one end of the first-fourth profile (14); the clamping connector provided at the other end of the first-fourth profile (14) is clamped to the clamping groove provided at the upper end of the second-first profile (21); The first profile (11), the first second profile (12), the first third profile (13) and the first fourth profile (14) are all arc-shaped structures.

5. The vehicle body profile device suitable for full friction stir welding according to claim 3, characterized in that: The flat roof module (4) further includes a fourth third profile (43) and a fourth fourth profile (44) arranged in pairs; The embedded end provided at one end of the fourth third profile (43) is cooperatively connected with the extended end provided at the other end of the fourth second profile (42); The protruding end provided at the other end of the fourth-third profile (43) is connected in cooperation with the protruding end provided at one end of the fourth-fourth profile (44); the clamping joint provided at the other end of the fourth-fourth profile (44) is connected in cooperation with the clamping groove provided at the upper end of the second-first profile (21).

6. The vehicle body profile device suitable for full friction stir welding according to claim 1, characterized in that: The end of the male connector (5) away from any profile is provided with a plug-in boss (51), and the end of the male connector (5) close to any profile is provided with a first profile cavity (52); the periphery of the male connector (5) is provided with a first stirring boss (53); The end of the female connector (6) away from any profile is provided with a plug-in groove (61), and the end of the female connector (6) close to any profile is provided with a second profile cavity (62); the periphery of the female connector (6) is provided with a second stirring boss (63); The plug-in boss (51) of the male connector (5) and the plug-in groove (61) of the female connector (6) are connected in a mating manner.

7. The vehicle body profile device suitable for full friction stir welding according to claim 6, characterized in that: The length of the plug-in boss (51) of the male connector (5) is smaller than the depth of the plug-in groove (61) of the female connector (6).

8. The vehicle body profile device suitable for full friction stir welding according to claim 6, characterized in that: The center line of the male connector (5) and the center line of the female connector (6) are collinear; the outer surfaces of the first stirring boss (53) and the second stirring boss (63) are coplanar.

9. The vehicle body profile device suitable for full friction stir welding according to claim 6, characterized in that: The plug-in boss (51) of the male connector (5) comprises two symmetrically arranged extensions, and the angle formed by the two sides of the extensions ranges from 35° to 45°.

10. The vehicle body profile device suitable for full friction stir welding according to claim 6, characterized in that: The difference between the width of the plug-in groove (61) and the width of the plug-in boss (51) ranges from 0.2 mm to 1.2 mm.

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