Oil tank seam welding device and welding method

Abstract

The invention relates to the technical field of welding, in particular to an oil tank seam welding device and a welding method. The oil tank seam welding device comprises a welding assembly, a positioning assembly, a guiding assembly and a rotating assembly. The welding assembly comprises two electrode wheels, first anti-skid lines are arranged on the circumferential surfaces of the electrode wheels, and a first included angle of an acute angle is formed between the lines and the axis. The positioning assembly is provided with a profiling seat, and a profiling groove in the profiling seat is matched with the fuel tank in shape. The guide assembly comprises a first guide rail, a second guide rail and a plurality of guide columns, the first guide rail and the second guide rail are parallel, a guide channel is arranged between the two guide rails, the guide columns are fixedly connected with the bottom of the profiling seat and arranged at intervals along the contour of the profiling seat, two ends of the guide channel are an inlet end and an outlet end, the guide columns enter from the inlet end and exit from the outlet end, and the welding assembly is arranged above the guide assembly. The rotating assembly drives the profiling base to rotate, in the process, part of the guide columns go out, part of the guide columns go in, and the ends, close to the outlet ends, of the first anti-skid lines incline towards the profiling base. Therefore, the problem of over-welding of a weld corner caused by vibration of the guide post is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and in particular to a fuel tank seam welding device and a welding method. Background Art

[0002] During the fuel tank welding process, the friction between the two electrode wheels and the tank surface is typically used to move the tank forward along a pre-set guide channel. Simultaneously, a rotating assembly is connected to the tank, driving it to rotate during the process. This allows the electrode wheels to form a contoured weld along the tank's edge that follows the pre-set trajectory, thus enabling the tank's edge to be welded.

[0003] However, the guide post must fit into the guide channel to accommodate the movement and rotation of the fuel tank. If the contoured seat rotates too far, the fuel tank's rotational inertia is transferred to the guide post, causing it to repeatedly impact within the channel. This reduces the tank's positioning accuracy during rotation, leading to oscillation. This can cause repeated welding at the weld corners, resulting in over-welding and ultimately compromising weld quality. Summary of the Invention

[0004] In order to solve the problem of over-welding of weld corners caused by vibration of a guide column, the present invention provides a fuel tank seam welding device and a welding method.

[0005] In a first aspect, the present invention provides a fuel tank seam welding device, comprising:

[0006] A welding assembly comprising two electrode wheels; a circumferential surface of each electrode wheel has a first anti-slip pattern; a first angle is formed between the pattern of the first anti-slip pattern and the axis of the electrode wheel; and the first angle is an acute angle.

[0007] A positioning assembly, the positioning assembly comprising a contoured seat; the contoured seat having a contoured groove; the contoured groove being adapted to the shape of the fuel tank;

[0008] A guide assembly comprising a first guide rail, a second guide rail, and a plurality of guide posts; the first guide rail and the second guide rail are parallel; a guide channel is defined between the first guide rail and the second guide rail; the plurality of guide posts are fixedly connected to the bottom of the contour seat; the plurality of guide posts are spaced apart along the contour of the contour seat; one end of the guide channel is an entrance end, and the other end is an exit end; the guide posts enter the guide channel from the entrance end and exit the guide channel from the exit end; the welding assembly is located above the guide assembly;

[0009] A rotating component drives the contour seat to rotate; during the rotation of the contour seat, some of the guide posts leave the guide channel from the outlet end, and another part of the guide posts enter the guide channel from the inlet end; the first anti-slip pattern is inclined toward the contour seat at one end close to the outlet end.

[0010] In some embodiments, the first angle is complementary to a minimum angle of a circular weld of the fuel tank.

[0011] In some embodiments, the arc length of the first anti-slip groove in the circumferential direction of the electrode wheel is greater than or equal to the arc length of the minimum angle of the weld of the fuel tank.

[0012] In some embodiments, the middle of the first anti-slip groove protrudes from the electrode wheel to a first height; the two ends of the first anti-slip groove protrude from the electrode wheel to a second height; and the first height is smaller than the second height.

[0013] In some embodiments, the surface of each of the first anti-slip grooves facing away from the electrode wheel is an extrusion plane; and a perpendicular line from the middle of each of the first anti-slip grooves to the axis of the electrode wheel is perpendicular to the extrusion plane.

[0014] In some embodiments, a dimension of each of the first anti-slip grooves in the axial direction of the electrode wheel is less than 70% of the axial length of the electrode wheel.

[0015] In some embodiments, the circumferential surface of the electrode wheel further has a second anti-slip pattern; the pattern of the second anti-slip pattern is parallel to the axis of the electrode wheel.

[0016] In some embodiments, the circumferential surface of the electrode wheel further has a third anti-slip pattern; a second angle is formed between the pattern of the third anti-slip pattern and the axis of the electrode wheel; and the second angle is an acute angle;

[0017] The second included angle in the annular weld of the fuel tank arranged in ascending order is complementary to the second included angle.

[0018] In some embodiments, a distribution density of the first anti-slip grooves along the axis of the electrode wheel is greater than a distribution density of the third anti-slip grooves along the axis of the electrode wheel.

[0019] In a second aspect, the present invention provides a fuel tank welding method, which is applied to the fuel tank seam welding device described in any one of the first aspects, and the fuel tank welding method includes:

[0020] Get the model information of the fuel tank;

[0021] Based on the model information, remodeling the fuel tank seam welding device so that the welding assembly and the positioning assembly match the fuel tank;

[0022] Upon completion of the fuel tank seam welding device transformation, the two electrode wheels of the welding assembly are controlled to rotate until the first anti-slip groove is at a preset initial position, so that the first anti-slip groove can squeeze and weld the largest arc welding path of the fuel tank corner during welding;

[0023] Positioning the fuel tank on the positioning assembly;

[0024] Based on the fuel tank being positioned and the first anti-slip groove being at the preset initial position, controlling the two electrode wheels of the welding assembly to clamp the welding starting point of the fuel tank;

[0025] Based on the electrode wheel being at the welding starting position, controlling the electrode wheel to rotate so as to drive the fuel tank to move and weld the fuel tank;

[0026] Based on the electrode wheel being in a rotating state, the rotating assembly is controlled to drive the positioning assembly to rotate a preset angle within a preset time period until the welding assembly welds along the contour of the fuel tank to form a contoured annular weld, and the welding is completed.

[0027] In order to solve the problem of over-welding of weld corners caused by vibration of the guide column, the present invention has the following advantages:

[0028] By providing a first anti-skid pattern on the circumferential surface of the electrode wheel in the welding assembly, and forming a first acute angle between the pattern of the first anti-skid pattern and the axis of the electrode wheel, and at the same time, the end of the pattern of the first anti-skid pattern close to the outlet end is inclined toward the contoured seat, the linear velocity direction of the fuel tank can be made perpendicular to the first anti-skid pattern when entering the welding area at the corner of the fuel tank, thereby generating a higher damping force, improving the stability of the positioning of the fuel tank during rotation, and reducing oscillation; thereby avoiding inaccurate welding of the fuel tank caused by repeated collisions of the guide column in the guide channel, reducing the possibility of repeated welding and over-welding at the corner of the weld, and ultimately improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a fuel tank welding device according to an embodiment is shown;

[0030] Figure 2 Shown Figure 1 Schematic diagram of welding components and positioning components;

[0031] Figure 3 Shown Figure 2 A top view of the welding assembly and the positioning assembly;

[0032] Figure 4 Shown Figure 2 Schematic diagram of the positioning component in;

[0033] Figure 5 Shown Figure 2 Magnified view of welded components in ;

[0034] Figure 6 A schematic flow chart of a fuel tank welding method according to an embodiment is shown.

[0035] Reference numerals: welding assembly 10; electrode wheel 11; first anti-slip groove 12; second anti-slip groove 13; third anti-slip groove 14; positioning assembly 20; contour seat 21; contour groove 22; guide assembly 30; first guide rail 31; second guide rail 32; guide column 33; rotating assembly 40; fuel tank 50. DETAILED DESCRIPTION

[0036] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0037] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0038] During the welding process of the fuel tank 50, the friction generated between the two electrode wheels 11 and the surface of the fuel tank 50 is typically used to drive the fuel tank 50 along a preset guide channel. Simultaneously, the rotating assembly 40 is connected to the fuel tank 50, driving the fuel tank 50 to rotate during movement. This allows the electrode wheels 11 to form a contoured weld on the edge of the fuel tank 50, thereby achieving welding of the edge of the fuel tank 50. However, the guide post 33 must enter the guide channel to accommodate the movement and rotation of the fuel tank 50. When the contoured seat 21 rotates too far, the rotational inertia generated by the fuel tank 50 is transmitted to the guide post 33, causing the guide post 33 to repeatedly collide within the guide channel. This can cause the positioning accuracy of the fuel tank 50 to decrease during rotation, resulting in oscillation, which in turn can cause repeated welding at the corners of the weld, resulting in over-welding and affecting the welding quality.

[0039] Example 1:

[0040] In this embodiment, in order to solve the above problems, the present application provides a fuel tank welding device, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown, the oil tank welding device includes a welding assembly 10 , a positioning assembly 20 , a guide assembly 30 , and a rotating assembly 40 .

[0041] The welding assembly 10 includes two electrode wheels 11. The friction generated between the two electrode wheels 11 and the surface of the fuel tank 50 drives the fuel tank 50 along a pre-set guide channel, achieving the welding operation on the weld seam of the fuel tank 50. The circumferential surface of the electrode wheels 11 is provided with first anti-slip grooves 12. These first anti-slip grooves 12 increase the friction between the electrode wheels 11 and the surface of the fuel tank 50, ensuring a more stable driving effect on the fuel tank 50. Furthermore, the first anti-slip grooves 12 form a first acute angle with the axis of the electrode wheels 11.

[0042] The positioning assembly 20 includes a contoured seat 21 having a contoured groove 22 that matches the shape of the fuel tank 50. The contoured seat 21 can position and limit the fuel tank 50 to ensure that the fuel tank 50 does not deviate during welding.

[0043] The guide assembly 30 includes a first guide rail 31, a second guide rail 32, and a plurality of guide posts 33. The first and second guide rails 31 and 32 are arranged parallel to each other, with a guide channel between them to provide a path for the guide posts 33 to move. The plurality of guide posts 33 are fixedly connected to the bottom of the contour seat 21. The plurality of guide posts 33 are spaced along the contour of the contour seat 21. The guide channel has one end as an entrance and the other as an exit. The guide posts 33 enter the guide channel at the entrance and exit at the exit. The welding assembly 10 is located above the guide assembly 30. As the contour seat 21 moves and rotates, the guide posts 33 move in and out of the guide channel, guiding and limiting the movement of the contour seat 21 and the fuel tank 50, ensuring that the fuel tank 50 moves along a predetermined trajectory and cooperates with the welding assembly 10 to complete the welding process.

[0044] The rotating assembly 40 drives the contour seat 21 to rotate, enabling the electrode wheel 11 to weld at the corners of the fuel tank 50, ensuring weld continuity. The rotating assembly 40 can be a pneumatic cylinder, an electric motor, a hydraulic motor, or the like. During the rotation of the contour seat 21, some guide posts 33 exit the guide channel at the exit end, while others enter the guide channel at the entrance end. This adapts to the rotational motion of the contour seat 21, guiding and limiting the movement of the contour plate and fuel tank 50. The first anti-slip groove 12 has its end near the exit end angled toward the contour seat 21. When the fuel tank 50 rotates at a large angle, the guide posts 33 entering the guide channel can collide with the first rail. The reaction force of the first rail then rebounds, causing them to collide with the second rail 32. This causes the guide posts 33 to oscillate repeatedly between the first and second rails, which is then transmitted to the weld between the fuel tank 50 and the electrode wheel 11, affecting the weld quality between the fuel tank 50 and the electrode wheel 11. The first anti-slip groove 12 has its end near the outlet angled toward the contoured seat 21, allowing it to assume a vertical position when the two electrode wheels 11 enter the weld corner of the fuel tank 50. This enhances friction and damping, reduces the impact of repeated oscillations transmitted to the fuel tank 50, and ensures smooth rotation of the fuel tank 50. This reduces the risk of repeated welding at the corner due to excessive and uncontrolled oscillations of the electrode wheels 11 after entering the weld corner of the fuel tank 50, thereby reducing the risk of repeated welding at the corner of the fuel tank 50 and improving welding quality.

[0045] Furthermore, if Figure 5 As shown, the first angle is complementary to the minimum angle of the annular weld of the fuel tank 50. This arrangement allows the first anti-slip groove 12 to better match the minimum angle of the annular weld of the fuel tank 50. This complementary relationship between the first angle and the minimum angle of the annular weld ensures that the first anti-slip groove 12 is perpendicular to the weld corner of the fuel tank 50. This enhances the friction and damping force between the electrode wheel 11 and the fuel tank 50 at the corner, effectively reducing the risk of repeated welding at the weld corner.

[0046] Furthermore, if Figure 5 As shown, the arc length of the first anti-skid groove 12 in the circumferential direction of the electrode wheel 11 is greater than or equal to the arc length at the minimum angle of the weld of the fuel tank 50. This ensures that the first anti-skid groove 12 on the electrode wheel 11 always contacts the minimum angle of the weld corner of the fuel tank 50. This ensures that the first anti-skid groove 12 can continuously provide a strong damping force during the rotation of the fuel tank 50, thereby reducing the occurrence of repeated welding at the weld corner of the fuel tank 50 due to insufficient anti-skid groove coverage. Ultimately, this reduces the occurrence of repeated welding and ensures the reliability of the weld of the fuel tank 50.

[0047] Furthermore, if Figure 5As shown, the center of the first anti-skid groove 12 protrudes from the electrode wheel 11 by a first height. The ends of the first anti-skid groove 12 protrude from the electrode wheel 11 by a second height. The first height is smaller than the second height. This creates a larger contact area when the center of the first anti-skid groove 12 contacts the fuel tank, thereby generating greater frictional resistance. This enhanced friction at the corner of the weld between the first anti-skid groove 12 and the fuel tank 50 helps improve the stability of the fuel tank 50 during rotation and reduces the impact of oscillations generated by the guide post 33.

[0048] Further, if Figure 6 As shown, the surface of each of the first anti-slip grooves 12 facing away from the electrode wheel 11 forms an extrusion plane. The perpendicular line from the center of each of the first anti-slip grooves 12 to the axis of the electrode wheel 11 is perpendicular to the extrusion plane. This allows the first anti-slip grooves 12 to exert a greater extrusion force on the fuel tank 50 at the point of contact, utilizing the height of the two ends of the first anti-slip grooves 12, thereby achieving greater frictional resistance. Furthermore, the perpendicular line from the center of the first anti-slip grooves 12 to the axis of the electrode wheel 11 is perpendicular to the extrusion plane, resulting in a larger contact area between the center of the first anti-slip grooves 12 and the fuel tank 50, generating greater frictional resistance and, as a whole, enhancing the frictional effect of the first anti-slip grooves 12 on the fuel tank 50.

[0049] Further, if Figure 5 As shown, the dimension of each groove of the first anti-slip groove 12 in the axial direction of the electrode wheel 11 is less than 70% of the axial length of the electrode wheel 11. Since the ends of the first anti-slip groove 12 protrude from the electrode wheel 11 by the second height, a longer length of the first anti-slip groove 12 would cause a certain amount of jerkiness when the first anti-slip groove 12 first contacts the fuel tank 50 and transitions to the middle of the first anti-slip groove 12. Therefore, by limiting the length of the first anti-slip groove 12, the electrode wheel 11 can maintain a stable weld to the fuel tank 50 when the first anti-slip groove 12 contacts the fuel tank 50, thereby ensuring the quality of the weld seam between the electrode wheel 11 and the fuel tank 50.

[0050] Further, if Figure 5 As shown, the circumferential surface of the electrode wheel 11 also has second anti-slip grooves 13; the second anti-slip grooves 13 are parallel to the axis of the electrode wheel 11. When the electrode wheel 11 moves linearly along the weld seam of the fuel tank 50, the second anti-slip grooves 13 further increase the friction between the electrode wheel 11 and the surface of the fuel tank 50, providing a stable damping force. Together with the first anti-slip grooves 12, they create a multi-directional anti-slip effect, thereby enhancing the stability of the fuel tank 50 during welding, reducing vibration, and ultimately reducing the possibility of repeated welding of the fuel tank 50.

[0051] Further, if Figure 5As shown, the circumferential surface of the electrode wheel 11 also has a third anti-slip groove 14. The third anti-slip groove 14 forms a second angle with the axis of the electrode wheel 11, and the second angle is an acute angle. The second angle in the annular weld of the fuel tank 50, which is arranged in ascending order, is complementary to the second angle. The provision of the third anti-slip groove 14 can increase the contact friction between the electrode wheel 11 and the weld of the fuel tank 50. The acute second angle enables the second anti-slip groove 13 to provide a greater damping effect at the second angle in the annular weld of the fuel tank 50, which is arranged in ascending order. The second angle in the annular weld of the fuel tank 50 is complementary to the second angle, which allows the third anti-slip groove 14 to better adapt to the weld at that position, thereby further improving the stability of the fuel tank 50 during welding, reducing vibration, and thus reducing the occurrence of repeated welding.

[0052] Furthermore, if Figure 5 As shown, the distribution density of the first anti-slip grooves 12 along the axis of the electrode wheel 11 is greater than the distribution density of the third anti-slip grooves 14 along the axis of the electrode wheel 11. At the largest angle in the annular weld of the fuel tank 50, the higher distribution density of the first anti-slip grooves 12 provides a denser concentration of first anti-slip grooves 12 in the area with the largest corner angle, enhancing frictional resistance and reducing oscillation when the electrode wheel 11 welds the fuel tank 50 weld. The lower distribution density of the third anti-slip grooves 14 satisfies the friction requirements at the second-highest angle in the annular weld of the fuel tank 50, avoiding unnecessary energy consumption caused by excessive provision of the third anti-slip grooves 14. The coordination of the first and third anti-slip grooves 12, 14, ensures more precise welding stability at the corners of the fuel tank 50 welded by the electrode wheel 11.

[0053] Example 2:

[0054] In this embodiment, the present application provides a fuel tank welding method, which is applied to any fuel tank seam welding device in embodiment 1, such as Figure 6 As shown, the fuel tank welding method includes steps S10 to S70, and steps S10 to S70 are described in detail below:

[0055] Step S10: Obtain the model information of the fuel tank 50.

[0056] In step S20 , based on the model information, the seam welding device of the fuel tank 50 is remodeled so that the welding assembly 10 and the positioning assembly 20 match the fuel tank 50 , laying a foundation for subsequent precise welding.

[0057] In step S30, upon completion of the seam welding device redesign for the fuel tank 50, the two electrode wheels 11 of the welding assembly 10 are controlled to rotate until the first anti-slip grooves 12 are in the preset initial position. This ensures that the first anti-slip grooves 12 compress the arc welding path at the largest corner of the fuel tank 50 during welding. The provision of the first anti-slip grooves 12 reduces the vibration of the guide column 33, thereby minimizing the impact on the welding of the fuel tank 50. This ensures that the minimum angle between the first anti-slip grooves 12 and the annular weld of the fuel tank 50 complements each other, thereby ensuring the reliability of the weld seam of the fuel tank 50.

[0058] In step S40 , the fuel tank 50 is positioned on the positioning assembly 20 to ensure the position of the fuel tank 50 during the welding process and improve the welding quality of the weld of the fuel tank 50 .

[0059] In step S50 , based on the fuel tank 50 being positioned and the first anti-slip groove 12 being at the preset initial position, the two electrode wheels 11 of the welding assembly 10 are controlled to clamp the welding starting position of the fuel tank 50 to ensure that the two electrode wheels 11 can weld the fuel tank 50 .

[0060] Step S60 , based on the electrode wheel 11 being at the welding starting position, controlling the electrode wheel 11 to rotate, so as to drive the fuel tank 50 to move and weld the fuel tank 50 .

[0061] In step S70, based on the electrode wheel 11 being in a rotating state, the rotating assembly 40 is controlled to drive the positioning assembly 20 to rotate by a preset angle within a preset time period. Specifically, the electrode wheel 11's welding position on the fuel tank 50 is determined in real time based on the electrode wheel 11's rotational speed and rotation time. After the preset time has elapsed, it indicates that the electrode wheel 11 needs to weld the corner of the fuel tank 50. Therefore, the rotating assembly 40 is controlled to rotate the positioning assembly 20 and the fuel tank 50 within the positioning assembly 20, thereby enabling the electrode wheel 11 to better weld the fuel tank 50. This process continues until the welding assembly 10 forms a contoured annular weld along the contour of the fuel tank 50, and welding is complete.

[0062] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A fuel tank seam welding device, characterized in that: The fuel tank seam welding device comprises: A welding assembly comprising two electrode wheels; a circumferential surface of each electrode wheel has a first anti-slip pattern; a first angle is formed between the pattern of the first anti-slip pattern and the axis of the electrode wheel; and the first angle is an acute angle. A positioning assembly, the positioning assembly comprising a contoured seat; the contoured seat having a contoured groove; the contoured groove being adapted to the shape of the fuel tank; A guide assembly comprising a first guide rail, a second guide rail, and a plurality of guide posts; the first guide rail and the second guide rail are parallel; a guide channel is defined between the first guide rail and the second guide rail; the plurality of guide posts are fixedly connected to the bottom of the contour seat; the plurality of guide posts are spaced apart along the contour of the contour seat; one end of the guide channel is an entrance end, and the other end is an exit end; the guide posts enter the guide channel from the entrance end and exit the guide channel from the exit end; the welding assembly is located above the guide assembly; A rotating component drives the contour seat to rotate; during the rotation of the contour seat, some of the guide posts leave the guide channel from the outlet end, and another part of the guide posts enter the guide channel from the inlet end; the first anti-slip pattern is inclined toward the contour seat at one end close to the outlet end.

2. The fuel tank seam welding device according to claim 1, characterized in that: The first angle is complementary to a minimum angle of the annular weld of the fuel tank.

3. The fuel tank seam welding device according to claim 1, characterized in that: The arc length of the first anti-slip groove in the circumferential direction of the electrode wheel is greater than or equal to the arc length of the minimum angle of the weld of the fuel tank.

4. The fuel tank seam welding device according to claim 1, characterized in that: The middle of the first anti-slip groove protrudes from the electrode wheel to a first height; the two ends of the first anti-slip groove protrude from the electrode wheel to a second height; the first height is smaller than the second height.

5. The fuel tank seam welding device according to claim 4, characterized in that: The surface of each of the first anti-slip grooves facing away from the electrode wheel is an extrusion plane; and a perpendicular line from the middle of each of the first anti-slip grooves to the axis of the electrode wheel is perpendicular to the extrusion plane.

6. The fuel tank seam welding device according to claim 5, characterized in that: A dimension of each of the first anti-slip grooves in the axial direction of the electrode wheel is less than 70% of the axial length of the electrode wheel.

7. The fuel tank seam welding device according to claim 1, characterized in that: The circumferential surface of the electrode wheel further has second anti-slip grooves; the lines of the second anti-slip grooves are parallel to the axis of the electrode wheel.

8. The fuel tank seam welding device according to claim 7, characterized in that: The circumferential surface of the electrode wheel further has a third anti-slip pattern; a second angle is formed between the pattern of the third anti-slip pattern and the axis of the electrode wheel; the second angle is an acute angle; The second included angle in the annular weld of the fuel tank arranged in ascending order is complementary to the second included angle.

9. The fuel tank seam welding device according to claim 8, characterized in that: The distribution density of the first anti-slip grooves along the axis of the electrode wheel is greater than the distribution density of the third anti-slip grooves along the axis of the electrode wheel.

10. A fuel tank welding method, applied to the fuel tank seam welding device according to any one of claims 1 to 9, characterized in that: The fuel tank welding method comprises: Get the model information of the fuel tank; Based on the model information, remodeling the fuel tank seam welding device so that the welding assembly and the positioning assembly match the fuel tank; Upon completion of the fuel tank seam welding device transformation, the two electrode wheels of the welding assembly are controlled to rotate until the first anti-slip groove is at a preset initial position, so that the first anti-slip groove can squeeze and weld the largest arc welding path of the fuel tank corner during welding; Positioning the fuel tank on the positioning assembly; Based on the fuel tank being positioned and the first anti-slip groove being at the preset initial position, controlling the two electrode wheels of the welding assembly to clamp the welding starting point of the fuel tank; Based on the electrode wheel being at the welding starting position, controlling the electrode wheel to rotate so as to drive the fuel tank to move and weld the fuel tank; Based on the electrode wheel being in a rotating state, the rotating assembly is controlled to drive the positioning assembly to rotate a preset angle within a preset time period until the welding assembly welds along the contour of the fuel tank to form a contoured annular weld, and the welding is completed.

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