Automatic welding process production line for rear longitudinal beam of electric vehicle

Abstract

The invention provides an automatic welding process production line for a rear longitudinal beam of an electric vehicle. The automatic welding process production line comprises a plurality of assembly operation areas which are sequentially arranged according to an assembly process of a rear longitudinal beam part. In the part feeding assembly station, the clamp tool firmly fixes and accurately positions the parts of the rear longitudinal beam, and the assembly accuracy of the parts is ensured. In a robot operation area, the low-load robot carries the lightweight pneumatic welding tongs, and a welding tongs body and a transformer are connected through a cable and reasonably distributed on a robot shaft. The low-load robot drives the welding tongs to clamp the rear longitudinal beam component to move to the robot repair welding area, the fixed repair welding machine firmly welds the rear longitudinal beam component, and the welding seam quality is ensured. And meanwhile, the gripper robot is provided with a gripper mechanism, after welding is completed, the gripper mechanism rapidly clamps the welded part, and the gripper robot carries the welded part to a clamp tool of the next assembly operation area according to a set path. The whole production line can effectively consider cost effectiveness, welding quality and production efficiency.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rear longitudinal beam welding, and particularly relates to an automatic welding process production line for a rear longitudinal beam of an electric vehicle. BACKGROUND

[0002] In the field of automobile manufacturing, the rear longitudinal beam of an automobile, as a key sheet metal component, plays a vital role in the quality of the automobile. At present, there are mainly two application situations of the traditional welding technology for the rear longitudinal beam of an automobile:

[0003] On the one hand, the manual welding mode is adopted. This mode is not only low in welding efficiency, but also extremely high in labor intensity. Due to the interference of human factors, the welding quality is difficult to be effectively guaranteed, and quality problems such as unstable and uneven welding are prone to occur, thereby affecting the performance and quality stability of the automobile, and it is difficult to meet the demand of modern automobile production for high-efficiency and high-quality welding technology.

[0004] On the other hand, some enterprises adopt the automatic welding technology of a 210Kg large-load large-arm robot. Although this technology has certain improvement in efficiency and quality control compared with the manual welding, the equipment cost is high, and the cost of one robot is as high as 400,000 yuan, which is a huge burden for the production line investment cost of the enterprise, and limits the wide application of the technology in the industry. Especially for some small and medium-sized automobile part manufacturing enterprises or specific project development, the cost input-output ratio is extremely ideal, and it is difficult to be widely applied in the project.

[0005] In the development project of the rear longitudinal beam of an automobile, in view of the many drawbacks of the traditional welding technology, such as the efficiency and quality problems of the manual welding and the high cost problem of the high-load automatic welding, therefore, a new welding technology scheme which can balance the cost benefit and the welding quality and the production efficiency is urgently needed, so as to promote the progress of the manufacturing technology of the rear longitudinal beam of an automobile, and adapt to the new trend of the development of automobile production. SUMMARY

[0006] The application aims to provide an automatic welding process production line for the rear longitudinal beam of an electric vehicle, which can effectively balance the cost benefit and the welding quality and the production efficiency.

[0007] To solve the above technical problems, the application provides an automatic welding process production line for the rear longitudinal beam of an electric vehicle, which comprises a plurality of assembly work areas arranged in sequence according to the assembly sequence of each component of the rear longitudinal beam, and each assembly work area comprises a feeding assembly station, a robot operation area and a robot repair welding area.

[0008] A clamp tool is arranged on the feeding assembly station.

[0009] The robot operating area is provided with a low-load robot and a light pneumatic welding tongs, the light pneumatic welding tongs comprises a welding tongs body connected by a cable and a transformer, the fixed end of the welding tongs body is arranged on the flange plate of the end shaft of the low-load robot, the transformer is arranged on the shaft of the low-load robot except the end shaft, the light pneumatic welding tongs is used for clamping the rear longitudinal beam component, and the low-load robot is used for driving the light pneumatic welding tongs to move the corresponding rear longitudinal beam component to the robot repair welding area.

[0010] The robot repair welding area is provided with a fixed repair welding machine, a grabbing robot and a grabbing mechanism, the fixed repair welding machine is used for welding the rear longitudinal beam component from the light pneumatic welding tongs, the grabbing mechanism is arranged on the flange plate of the end shaft of the grabbing robot, the grabbing mechanism is used for clamping the welded rear longitudinal beam component, and the grabbing robot drives the grabbing mechanism to move the corresponding rear longitudinal beam component to the jig tool of the next assembly work area.

[0011] Optionally, in the above-mentioned electric vehicle rear longitudinal beam automatic welding process production line, the upper assembly work station is further provided with a quick mounting base for detachable connection with the jig tool and a latch for plug-in connection with the jig tool, the quick mounting base is installed on the ground, and the jig tool is moved to above the quick mounting base by a cart and fixedly connected by the latch.

[0012] Optionally, in the above-mentioned electric vehicle rear longitudinal beam automatic welding process production line, the grabbing mechanism comprises a bracket, two driving motors and two pairs of clamping jaw assemblies, each pair of the clamping jaw assemblies comprises a fixed jaw and a movable jaw, the bracket is connected with the flange plate of the grabbing robot and the fixed ends of the two driving motors respectively, one fixed jaw is connected with the fixed end of one driving motor, and the movable end of each driving motor is connected with one movable jaw.

[0013] Optionally, in the above-mentioned electric vehicle rear longitudinal beam automatic welding process production line, the bracket is a U-shaped bracket, the middle part of the bracket is connected with the flange plate of the grabbing robot, and the two ends of the bracket are respectively connected with the fixed ends of one driving motor.

[0014] Optionally, in the above-mentioned electric vehicle rear longitudinal beam automatic welding process production line, the bracket is a hollow square tube bracket.

[0015] And / or, the clamping jaw assembly is a thumb air cylinder.

[0016] Optionally, in the above-mentioned electric vehicle rear longitudinal beam automatic welding process production line, the low-load robot and the grabbing robot are both six-axis robots.

[0017] Optionally, in the automatic welding process production line of the rear longitudinal beam of the electric vehicle, an arc welding repair area is arranged at the outlet of the last assembly operation area of the rear longitudinal beam components in sequence, and a repair welding machine is arranged on the arc welding repair area.

[0018] Optionally, in the automatic welding process production line of the rear longitudinal beam of the electric vehicle, a manual offline inspection area is arranged at the outlet of the arc welding repair area.

[0019] Optionally, in the automatic welding process production line of the rear longitudinal beam of the electric vehicle, the automatic welding process production line of the rear longitudinal beam of the electric vehicle comprises two symmetrical production lines, and the two production lines are respectively used for welding left and right rear longitudinal beams.

[0020] Optionally, in the automatic welding process production line of the rear longitudinal beam of the electric vehicle, the welding tong body is made of aluminum alloy.

[0021] The application provides an automatic welding process production line of a rear longitudinal beam of an electric vehicle, which has the following beneficial effects:

[0022] A plurality of assembly operation areas are arranged in sequence according to the assembly process sequence of the rear longitudinal beam components. In the loading assembly station, the jig tool firmly fixes and accurately positions the parts of the rear longitudinal beam, so as to ensure the assembly accuracy of the parts. In the robot operation area, the low-load robot is loaded with a light-weight pneumatic welding tong, the welding tong body and the transformer are connected through a cable and are reasonably distributed on the robot shaft, so as to ensure the flexible movement and stable power supply of the welding tong. The low-load robot drives the welding tong to clamp the rear longitudinal beam component according to the preset program, and accurately moves to the robot repair welding area. After entering the robot repair welding area, the fixed repair welding machine firmly welds the rear longitudinal beam component, so as to ensure the weld quality. At the same time, the gripping robot is provided with a gripping mechanism, which quickly clamps the welded component after welding, and the gripping robot carries the component to the jig tool of the next assembly operation area according to the set path. The entire automatic welding process production line of the rear longitudinal beam of the electric vehicle can effectively balance the cost benefit and the welding quality and production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0024] Figure 1 The structure of the rear longitudinal beam is shown in the structure diagram of the rear longitudinal beam.

[0025] Figure 2A structure schematic diagram of an electric vehicle rear longitudinal beam automatic welding process production line provided by the embodiment of the present application is provided.

[0026] Figure 3 A structure schematic diagram of the quick mounting base and the latch provided by the embodiment of the present application is provided.

[0027] Figure 4 A structure schematic diagram of the clamp tool, the quick mounting base and the latch provided by the embodiment of the present application is provided. Figure 3

[0028] Figure 5 A structure schematic diagram of the clamp tool, the quick mounting base and the latch provided by the embodiment of the present application is provided.

[0029] Figure 6 A structure schematic diagram of the gripper structure provided by the embodiment of the present application is provided.

[0030] Figure 7 A structure schematic diagram of the gripper robot and the gripper structure provided by the embodiment of the present application is provided.

[0031] Figure 8 A structure schematic diagram of the low-load robot and the light-weight pneumatic welding tongs provided by the embodiment of the present application (the cable between the welding tong body and the transformer is not shown in the figure).

[0032] In the above figure:

[0033] 110 - clamp tool; 120 - quick mounting base; 130 - latch;

[0034] 210 - low-load robot; 220 - welding tong body; 230 - transformer;

[0035] 310 - fixed repair welding machine; 320 - gripper robot; 330 - gripper structure; 331 - support; 332 - driving motor; 333 - fixed claw; 334 - movable claw;

[0036] A - assembly work area; B - arc welding repair area; C - manual offline inspection area. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0038] The core of the present application is to provide an electric vehicle rear longitudinal beam automatic welding process production line, which can effectively balance cost efficiency, welding quality and production efficiency.

[0039] ​In order for those skilled in the art to better understand the technical solutions provided by the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0040] Specifically, referring to Figures 2-8 , the present application provides an automatic welding process production line for rear longitudinal beams of electric vehicles, comprising: a plurality of assembly work areas (i.e. Figure 2 A1-A6) arranged in sequence according to the assembly sequence of each component of the rear longitudinal beam, each assembly work area comprising a component loading and assembly station, a robot operating area and a robot repair welding area. Figure 1 As shown in the structural schematic diagram of the left rear longitudinal beam, it contains several parts, and a plurality of assembly work areas are assigned to each assembly work area according to the assembly sequence of each part of the rear longitudinal beam, so as to realize assembly and welding.

[0041] The component loading and assembly station is provided with a clamp tool 110, and the parts of the rear longitudinal beam can be clamped on the clamp tool 110 by manual or mechanical arm. The clamp tool 110 on different assembly work areas is different, corresponding to the parts of the rear longitudinal beam required in the area.

[0042] The robot positioning area is provided with a low-load robot 210 and a lightweight pneumatic welding tongs. The low-load robot generally refers to an industrial robot with a load capacity within a certain range, which has the characteristics of high efficiency and flexibility. The lightweight pneumatic welding tongs include a welding tongs body 220 connected by cable and a transformer 230. In order to adapt to the low-load lightweight design, the fixed end of the welding tongs body 220 is arranged on the flange plate of the end shaft of the low-load robot 210, and the transformer 230 is arranged on the shaft of the low-load robot 210 except the end shaft. The lightweight pneumatic welding tongs are used to clamp the corresponding rear longitudinal beam parts, and the low-load robot 210 is used to drive the lightweight pneumatic welding tongs to move the corresponding rear longitudinal beam parts to the robot repair welding area. In a specific embodiment, as shown in Figure 8 , the low-load robot 210 is a six-axis robot. The transformer of the lightweight pneumatic welding tongs is installed on the three axes of the robot, so that the robot itself is not subjected to too much load pressure, and the welding tongs also adopts lightweight pneumatic welding tongs (saving 50,000 per unit), and the weight of each welding tongs is designed to be within 20Kg, which meets the load requirement of the low-load robot 210.

[0043] The robot repair welding area is provided with a fixed repair welding machine 310, a grabbing robot 320 and a grabbing mechanism 330. The fixed repair welding machine 310 is used for welding the rear longitudinal beam parts from the lightweight pneumatic welding tongs. The grabbing mechanism 330 is arranged on the flange plate of the end shaft of the grabbing robot 320, and is used for clamping the welded rear longitudinal beam parts. The grabbing robot 320 drives the grabbing mechanism 330 to move the corresponding rear longitudinal beam parts to the clamp tool 110 of the next assembly work area.

[0044] The electric vehicle rear longitudinal beam automatic welding process production line provided by the scheme comprises a plurality of assembly work areas arranged in sequence according to the assembly process sequence of the rear longitudinal beam components. In the loading assembly station, the clamp tool 110 firmly fixes and accurately positions the components of the rear longitudinal beam, ensuring the assembly accuracy of the components. In the robot operation area, the low-load robot 210 carries a light-weight pneumatic welding tongs, the welding tongs body 220 is connected with the transformer 230 through a cable and is reasonably distributed on the robot shaft, ensuring the flexible movement and stable power supply of the welding tongs. The low-load robot 210 drives the welding tongs to hold the rear longitudinal beam components according to the preset program, and accurately moves to the robot repair welding area. After entering the robot repair welding area, the fixed repair welding machine 310 firmly welds the rear longitudinal beam components, ensuring the weld quality. At the same time, the gripper robot 320 is equipped with a gripper structure 330, which quickly holds the welded components after welding, and the gripper robot 320 carries them to the clamp tool 110 in the next assembly work area according to the set path. The entire electric vehicle rear longitudinal beam automatic welding process production line can effectively balance the cost benefit and welding quality, production efficiency.

[0045] In specific embodiments, as shown in Figures 3-5 The loading assembly station is also provided with a quick mounting base 120 and a latch 130. The quick mounting base 120 can be detachably connected with the clamp tool 110, and the latch 130 can be inserted with the clamp tool 110. The quick mounting base 120 is installed on the ground, and the clamp tool 110 is moved to above the quick mounting base 120 by a cart (not shown in the figure) and is fixedly connected by the latch 130.

[0046] For the loading assembly station that needs manual loading, the clamp tool 110 is provided with a pin hole. The latch 130 can be separately provided on the ground, or the latch can be directly integrated on the quick mounting base 120. Different clamp tools 110 can be replaced for different vehicle models, which can reduce the investment cost of the electric vehicle rear longitudinal beam automatic welding process production line.

[0047] In further embodiments, the gripper structure 330 includes a bracket 331, two drive motors 332, and two pairs of gripper assemblies. Each pair of gripper assemblies includes a fixed jaw 333 and a movable jaw 334. The bracket 331 is connected with the flange plate of the gripper robot 320 and the fixed end of the two drive motors 332, respectively. One fixed jaw 333 is connected with the fixed end of one drive motor 332, and the movable end of each drive motor 332 is connected with one movable jaw 334.

[0048] As shown in Figure 6 and Figure 7 The bracket 331 is a U-shaped bracket, the middle part of the bracket 331 is connected with the flange plate of the gripper robot 320, and the two ends of the bracket 331 are respectively connected with the fixed end of one drive motor 332.

[0049] The grab robot 320 of the previous station carries the grab mechanism 330 to grab the process piece of the rear longitudinal beam to the welding tongs of the repair welding machine 310, and then the repair welding related welding points are welded to achieve the process required and the overall beat balance. After the welding is completed, the process piece is grabbed to the next station.

[0050] In specific embodiments, the bracket 331 is composed of a hollow square tube, which can achieve lightweight design. The claw assembly is a thumb cylinder, which is a small cylinder and its shape is similar to a finger. The lightweight pneumatic welding tongs using the thumb cylinder as the claw assembly can significantly reduce the weight while maintaining high-efficiency grabbing and welding capacity, improve the flexibility and response speed of operation, and are very suitable for robot operation and repair welding tasks in the automatic welding process production line of the rear longitudinal beam of the electric vehicle.

[0051] In addition, in order to achieve lightweight design, the welding tongs body 220 can also be made of aluminum alloy material, which can ensure the quality while reducing the size and weight of the welding tongs, making it lightweight, convenient and easy to use.

[0052] The low-load robot 210 and the grab robot 320 are both six-axis robots. The grab robot 320 adopts a lightweight, low-load and low-cost robot, and the load can be only 20Kg. The grab mechanism 330 adopts a low-cost square tube and thumb cylinder form to realize the clamping and opening of the rear longitudinal beam parts.

[0053] The above embodiments, combined with the structural characteristics of the product parts themselves, refer to the lightweight and low-cost grab mechanism 330.

[0054] The scheme also includes an arc welding repair area B arranged at the exit of the last assembly operation area A along the assembly sequence of each part of the rear longitudinal beam, and a repair welding machine is arranged on the arc welding repair area B. Most of the welding work has been completed in the previous assembly operation area A, but due to the complexity of factors such as welding environment, material properties and process requirements, welding defects (such as incomplete weld, uneven surface, and possible small pores inside) may still occur at some key positions. The arc welding repair area B can repair these potential welding defects specifically to ensure that the overall welding quality of the rear longitudinal beam meets the high standard requirements.

[0055] The scheme also includes a manual offline inspection area C arranged at the exit of the arc welding repair area B. The manual offline inspection area C is the last quality inspection process of the rear longitudinal beam welding production line, and all the rear longitudinal beams after automatic welding and arc welding repair are finally comprehensively inspected. Through manual visual inspection, manual measurement and necessary detection tools, the appearance, size and welding quality of the rear longitudinal beam are carefully inspected to ensure that each rear longitudinal beam meets the design and quality standards.

[0056] Of course, in the above-mentioned multiple assembly work areas A, manual manual welding area can also be included, for some special parts of the rear longitudinal beam, the robot cannot complete the welding, only manual manual welding mode can be realized.

[0057] The structure of the right rear longitudinal beam is similar to that of the left rear longitudinal beam, so the electric vehicle rear longitudinal beam automatic welding process production line can be designed as two symmetrical production lines, as shown in Figure 2 The two groups of production lines are used for welding the left and right rear longitudinal beams respectively.

[0058] The technical scheme provided by the present application has the following beneficial effects:

[0059] 1. High degree of automation: through robot operation and automatic welding equipment, manual intervention is reduced, production efficiency and consistency are improved, and labor cost and labor intensity are reduced.

[0060] 2. Stable welding quality: the cooperation of lightweight pneumatic welding tongs and low-load robots, as well as the application of fixed repair welding machines, can ensure accurate control and stable output of welding parameters, improve welding quality and strength, and ensure the performance of the rear longitudinal beam.

[0061] 3. Production efficiency is improved: each assembly work area is arranged in sequence according to the assembly sequence of the rear longitudinal beam parts, realizing the flow line operation of the production process, shortening the production cycle and improving the overall production efficiency.

[0062] 4. Reasonable equipment layout: the combination of the feeding assembly station, the robot operation area and the robot repair welding area forms a compact and efficient production layout, improving the equipment utilization and space utilization.

[0063] 5. Strong adaptability: the jig tooling and robot program can be adjusted according to the structure and size of different models of electric vehicle rear longitudinal beams, with good universality and flexibility, suitable for different production needs. In addition, the production line can effectively reduce the error accumulation in the production process, improve the consistency and reliability of the product, and provide strong support for the batch production of electric vehicles.

[0064] Compared with the traditional manual welding line and the conventional 210KG load medium frequency servo welding automation production line, the welding technology scheme adopted in this scheme has the process characteristics of low-cost 20KG load small robot, pneumatic lightweight welding tongs (only 20Kg weight) and low-cost lightweight gripper, which can automatically weld and automatically transport. At the same time, for different vehicle models, workstations can be added for different vehicle models, and the welding system has positive effects in reducing automation investment cost, high welding efficiency, reducing labor intensity, reducing labor cost and improving welding quality.

[0065] In practical application, the production line realizes automatic conveying of rear longitudinal beam parts between stations, and the automation rate reaches more than 95%, the production line only uses 10 assembly workers, greatly reducing the labor intensity of employees. In addition, the case also contains small part detection, anti-missing and anti-welding functions, and guarantees that the output products are absolutely qualified.

[0066] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right and the like, is based on the orientation or position relationship shown in the drawings, and 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 referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0067] In the description of the present application, the meaning of multiple is more than two, and if the first and the second are described, 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.

[0068] As shown in the present application and claims, unless the context clearly indicates otherwise, "one", "a", "an" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, product or device that includes the element.

[0069] In the description of the embodiments of the present application, unless otherwise specified, " / " represents or, for example, A / B can represent A or B; "and / or" in this paper is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0070] In the description of the present application, unless otherwise expressly limited, the words such as setting, mounting, connecting and the like 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 according to the specific content of the technical solution.

[0071] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0072] The principles and implementations of the present application are described in the specific examples herein, and the above examples are only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An electric vehicle rear longitudinal beam automatic welding process production line, characterized in that, The assembly work area (A) includes an upper assembly station, a robot operating area and a robot repair welding area. The upper assembly station is provided with a clamp tool (110). The robot operating area is provided with a low-load robot (210) and a lightweight pneumatic welding tongs. The robot repair welding area is provided with a fixed repair welding machine (310), a grabbing robot (320) and a grabbing mechanism (330).

2. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 1, characterized in that, The upper assembly station is also provided with a quick-mount base (120) for detachable connection with the clamp tool (110) and a latch (130) for plug-in connection with the clamp tool (110).

3. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 1, characterized in that, The grabbing mechanism (330) includes a bracket (331), two drive motors (332) and two pairs of jaw assemblies.

4. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 3, characterized in that, The bracket (331) is a U-shaped bracket, the middle part of the bracket (331) is connected with the flange plate of the grabbing robot (320), and the two ends of the bracket (331) are respectively connected with the fixed ends of the two drive motors (332).

5. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 3, characterized in that, The bracket (331) is a hollow square tube. And / or, the jaw assembly is a thumb air cylinder.

6. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 1, characterized in that, The low-load robot (210) and the grabbing robot (320) are both six-axis robots.

7. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 1, characterized in that, An arc welding repair area (B) is further included at the exit of the last assembly operation area (A) along the assembly sequence of each part of the rear longitudinal beam, and a repair welding machine is arranged on the arc welding repair area (B).

8. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 7, characterized in that, A manual off-line inspection area (C) is further included at the exit of the arc welding repair area (B).

9. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 8, characterized in that, The automatic welding process production line for the rear longitudinal beam of the electric vehicle comprises two symmetrical groups of production lines, and the two groups of production lines are respectively used for welding left and right rear longitudinal beams.

10. The electric vehicle rear longitudinal beam automatic welding process production line according to claim 1, characterized in that, The welding tong body (220) is made of aluminum alloy.

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