Three-layer welding structure and automobile

Abstract

The utility model relates to a three-layer welding structure and an automobile. The three-layer welding structure comprises a first connecting piece and a second connecting piece, wherein the first connecting piece comprises a first plate and a fusion welding column fixed on the first plate; the second connecting piece comprises a second plate and a first convex rib structure, the second plate is stacked on the first plate and arranged on the fusion welding column in a sleeving mode, the first convex rib structure is arranged on the side, opposite to the first plate, of the second plate, and the first convex rib structure comprises a plurality of first convex ribs arranged at intervals; the third connecting piece comprises a third plate and a second convex rib structure, the third plate is stacked on the second plate, the third plate and the fusion welding column are fixed in a fusion welding mode, the second convex rib structure is arranged on the side, facing the second plate, of the third plate, and the second convex rib structure comprises a plurality of second convex ribs arranged at intervals; the extension direction of the second convex rib is crossed with the extension direction of the first convex rib, and the second convex rib is propped against the first convex rib. The three-layer welding structure can effectively eliminate friction abnormal sound.

Description

Technical Field

[0001] This application relates to the field of automotive assembly technology, and in particular to three-layer welded structures and automobiles. Background Technology

[0002] With the continuous development of the automotive industry, people's demands for innovative styling of car interiors are constantly increasing, in order to achieve more functions or a more luxurious feel. This has led to an increase in the number of components in the car door panel assembly, making its structure increasingly complex.

[0003] These components can be fixed by welding during assembly, which may result in situations where multiple layers of welding are required.

[0004] Compared to fixing two components after welding, when multiple components are welded together, gaps may exist in the middle component due to various circumstances. Subsequently, during use, the middle component may deform or move slightly relative to other components under external force or stress, which will generate friction noise. Utility Model Content

[0005] Therefore, it is necessary to provide a three-layer welded structure and automobile to address at least one of the above-mentioned problems.

[0006] On one hand, this application provides a three-layer welded structure, comprising: a first connector including a first plate and a fusion-welded column fixed to the first plate; a second connector including a second plate and a first rib structure, the second plate being stacked on the first plate and sleeved on the fusion-welded column, the first rib structure being disposed on the side of the second plate facing away from the first plate, the first rib structure including a plurality of spaced-apart first ribs; and a third connector including a third plate and a second rib structure, the third plate being stacked on the second plate, the third plate being fusion-welded and fixed to the fusion-welded column, the second rib structure being disposed on the side of the third plate facing the second plate, the second rib structure including a plurality of spaced-apart second ribs, the extension direction of the second ribs intersecting the extension direction of the first ribs, the second ribs abutting against each other.

[0007] By setting intersecting first and second ribs, the contact area between the second and third connectors is reduced, avoiding the slight gaps that would result from large-area contact, and thus avoiding frictional noises caused by such gaps.

[0008] In the three-layer welded structure of this application, the splicing requirements of the second and third connectors when installed on the first connector are low, and the matching requirements are easy to meet; the second and third connectors form multi-point contact, and no gap is generated at each contact point; it can adapt to a certain degree of deformation or abrasion and wear, and ensure the suppression capability; it can maintain the ability to suppress abnormal noise after long-term use.

[0009] In some embodiments, the height of the first rib ranges from 0.2 mm to 1 mm; the height of the second rib ranges from 0.2 mm to 1 mm.

[0010] This design avoids significant interference with the overall assembly relationship of the three-layer welded structure and ensures that the contact area of ​​each of the first or second ribs is small.

[0011] In some embodiments, the first spacing between two adjacent first ribs is less than the width of the first rib; the second spacing between two adjacent second ribs is less than the width of the second rib.

[0012] This setup allows for a denser network of support points, and the second and third connectors enable more stable installation.

[0013] In some embodiments, the cross-sections of the first rib and the second rib are equilateral triangles; the first rib abuts against at least two corresponding second ribs, and the second rib abuts against at least two corresponding first ribs.

[0014] With this configuration, the first and second ribs are structurally stable and have a small contact area with each other; the first and second ribs are stably supported and have balanced forces.

[0015] In some embodiments, a plurality of first ribs are parallel to each other, a plurality of second ribs are parallel to each other, and the first ribs and second ribs are perpendicular to each other.

[0016] With this configuration, more and closer contact points can be achieved between the first and second rib structures, which helps to resist the influence from different directions in a balanced manner.

[0017] In some embodiments, the second plate has a first through hole, and the first rib is spaced apart from the first through hole; the third plate has a second through hole, and the second rib is spaced apart from the second through hole.

[0018] This design makes it easy to manufacture and assemble.

[0019] In some embodiments, the first connector further includes a support rib connected to the first plate and to the weld column, and the support rib abuts against the second connector.

[0020] This design allows for a suitable installation relationship between the second connector and the first connector in complex structures; the first connector has good structural strength.

[0021] In some embodiments, multiple support ribs of the first connector radially surround the welded column.

[0022] With this configuration, the first connector has good structural strength.

[0023] In some embodiments, a first rib structure surrounds the welded column, and a second rib structure surrounds the welded column.

[0024] With this configuration, the pressure between the first and second convex rib structures is more balanced.

[0025] For example, the dimension of the support rib along the welded column is greater than the thickness of the second plate.

[0026] With this configuration, the first plate can achieve a three-layer welded structure with the more distant second and third plates.

[0027] On the other hand, this application provides a door panel assembly that includes at least one of the aforementioned three-layer welded structures.

[0028] The door panel assembly of this application can integrate a large number of components, and while achieving a more complex structure, it can achieve overall connection using a three-layer welding structure. Moreover, it can effectively improve the problem of friction noise during use.

[0029] On the other hand, this application provides an automobile, which includes: a frame; and the aforementioned door panel assembly disposed on the frame.

[0030] The automobile described in this application can integrate more functional components or achieve a more luxurious interior, with less friction noise during operation, providing a quieter and more comfortable riding experience. Attached Figure Description

[0031] Figure 1 This is a schematic structural diagram of a three-layer welded structure according to one or more embodiments;

[0032] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 This is a schematic diagram of the structure of a first connector according to one or more embodiments;

[0034] Figure 4 This is a schematic diagram of the structure of a second connector according to one or more embodiments;

[0035] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0036] Figure 6 This is a schematic diagram of the structure of a third connector according to one or more embodiments;

[0037] Figure 7 This is a schematic structural diagram of a three-layer welded structure according to one or more embodiments;

[0038] Figure 8This is a schematic diagram of a three-layer welded structure according to one or more embodiments;

[0039] Figure 9 This is a schematic block diagram of a car according to one or more embodiments.

[0040] Explanation of reference numerals in the attached drawings: 1. First connector; 11. First plate; 12. Welded column; 120. Original welded column; 13. Support rib; 2. Second connector; 21. Second plate; 201. First through hole; 22. First rib structure; 220. First rib; 3. Third connector; 31. Third plate; 301. Second through hole; 32. Second rib structure; 320. Second rib; 1000. Automobile; 1100. Door panel assembly; 1110. Three-layer welded structure; 1200. Frame. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. For example, a first rib may also be referred to as a second rib, and a second rib may also be referred to as a first rib. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a flexible connection or a rigid connection along at least one direction; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a direct connection with an intermediate medium present; and they can also refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. The terms "installed," "set," "fixed," etc., can be broadly understood as connection. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] As used in this application, the terms "layer" and "region" refer to a material portion comprising a defined area and having a defined thickness. A layer can extend horizontally, vertically, and / or along a conical surface. A layer can be a region of uniform or non-uniform continuous structure, and its thickness perpendicular to the direction of extension may not exceed the thickness of the continuous structure. A layer can comprise multiple layers, which can be stacked layers or discretely extending layers. The shapes of the various regions and layers in the accompanying drawings, as well as their relative sizes and positional relationships, are merely illustrative and may deviate from actual dimensions due to manufacturing tolerances or technical limitations, and the design can be adjusted according to actual needs.

[0047] refer to Figure 1 , Figure 1 The three-layer welded structure of this application is shown. For ease of description, a spatial rectangular coordinate system XYZ is established. In an exemplary embodiment, the three-layer welded structure 1110 includes a first connector 1, a second connector 2, and a third connector 3. These three connectors can be arranged sequentially approximately along the Y-axis. The first connector 1, the second connector 2, and the third connector 3 extend approximately along the XZ plane and may have bends or deflections.

[0048] The three-layer welded structure 1110 may consist of only these three connectors. Exemplarily, the three-layer welded structure 1110 may be connected to other structures, each connector may connect to other components, or one connector may be part of an integral structure. Exemplarily, the first connector 1 and the third connector 3 may also be connected at other locations, for example, to form a two-layer welded structure.

[0049] The first connector 1 can be a one-piece structure. The first connector 1 includes a first plate 11 and a welding post 12. The welding post 12 is fixed to the first plate 11 and extends approximately along the Y-axis direction.

[0050] The second connector 2 can be an integral structure, comprising a second plate 21 and a first rib structure 22. The second plate 21 is stacked on top of the first plate 11 and is sleeved on the welding column 12. Exemplarily, the second plate 21 has a first through hole 201, through which the welding column 12 passes. The first rib structure 22 is located on the side of the second plate 21 facing away from the first plate 11, that is, the first rib structure 22 is located on the side of the second plate 21 facing away from the first plate 11. Figure 1 The left side is shown. For example, refer to... Figure 4 The first rib structure 22 surrounds the first through hole 201 and then surrounds the welded column 12. The first rib structure 22 may also be located on one side of the welded column 12.

[0051] Combination Figure 2 , Figure 4 and Figure 5 As shown, the first rib structure 22 includes a plurality of first ribs 220 spaced apart. Figure 2 The image shown could be a first rib 220 extending along the Z-axis.

[0052] The third connector 3 can be an integral structure. The third connector 3 includes a third plate 31 and a second rib structure 32. The third plate 31 is stacked on top of the second plate 21, and the third plate 31, the second plate 21, and the first plate 11 can be stacked sequentially along the Y-axis. For example, the third plate 31 has a second through hole 301, through which the welding column 12 passes. The third plate 31 and the welding column 12 are welded together and fixed, thereby allowing the third plate 31 and the first plate 11 to clamp and fix the second plate 21. The second rib structure 32 is located on the side of the third plate 31 facing the second plate 21, that is, the second rib structure 32 is located on the side of the third plate 31 facing the second plate 21. Figure 1 The right side is shown. For example, refer to... Figure 6The second rib structure 32 surrounds the second through hole 301, and at the same time, the second rib structure 32 also surrounds the fusion welding column 12. The second rib structure 32 can also be located on one side of the fusion welding column 12. The position of the second rib structure 32 corresponds to the position of the first rib structure 22, ensuring that after the third connector 3 and the second connector 2 are assembled, the second rib structure 32 can abut against the first rib structure 22.

[0053] refer to Figure 2 The second rib structure 32 includes a plurality of second ribs 320 spaced apart. Figure 2 Multiple second ribs 320 can be arranged side-by-side along the Z-axis, with a gap between adjacent second ribs 320 along the Z-axis. The extending direction of the second ribs 320 intersects the extending direction of the first rib 220. The second ribs 320 and the first rib 220 abut against each other. After welding and fixing, the third connector 3 and the second connector 2 are pressed against each other along the Y-axis, so that the second ribs 320 and the first rib 220 can engage. A portion of the second rib 320 can enter the first rib 220, or a portion of the first rib 220 can enter the second rib 320. By setting the intersecting first ribs 220 and second ribs 320, the contact area between the second connector 2 and the third connector 3 is reduced. Multi-point contact is formed between the second connector 2 and the third connector 3, and no gap is generated at each contact point, avoiding friction noise caused by slight gaps when there is a large area of ​​contact. In addition, this structure can maintain a small contact area after long-term use, suppressing the generation of friction noise.

[0054] When the second connector 2 and the third connector 3 are spliced ​​together, their relative theoretical posture may change due to dimensional tolerances, etc. The first rib structure 22 and the second rib structure 32 can effectively overlap and make contact at multiple points, which makes the splicing requirements of the second connector 2 and the third connector 3 when installed on the first connector 1 low and easy to meet the matching requirements. During the manufacturing, handling, storage or assembly process, the second connector 2 and the third connector 3 are always at risk of deformation or scratches and wear. If they are planar butt joints, they may become a source of friction noise. In this application, the ribs of the first rib structure 22 and the second rib structure 32 can adapt to a certain degree of deformation or scratches and wear, ensuring the ability to suppress noise. In addition, the three-layer welded structure 1110 can maintain the ability to suppress noise after long-term use.

[0055] refer to Figure 1 and Figure 3 In some embodiments, the first connector 1 further includes a support rib 13. The support rib 13 is connected to the first plate 11 and to the welded column 12. The support rib 13 may be approximately parallel to the Y-axis direction. The support rib 13 can improve the structural strength of the welded column 12 and also improve the connection strength between the first plate 11 and the welded column 12, resulting in good structural strength of the first connector 1.

[0056] refer to Figure 1 The support rib 13 abuts against the second connector 2. The first connector 1, second connector 2, and third connector 3 can all have complex shapes. In the complex three-layer welded structure 1110, the second connector 2 and the first connector 1 can achieve a suitable installation relationship. The distance between the second plate 21 and the first plate 11 near the welding column 12 along the Y-axis can be relatively large, allowing the first plate 11 to achieve three-layer welding with the relatively distant second plate 21 and third plate 31. For example, the dimension of the support rib 13 along the welding column 12 is greater than the thickness of the second plate 21 and also greater than the thickness of the first plate 11.

[0057] like Figure 3 As shown, the first connector 1 can be a first connector 1 before the welding process. The first connector 1 before the welding process may include a first plate 11 and a welding column component 120. (Reference) Figure 3 The multiple support ribs 13 of the first connector 1 can radially surround the welded column original 120. Understandably, after the welding process, the multiple support ribs 13 remain radially surrounding the welded column 120.

[0058] refer to Figure 2 and Figure 5 The first rib 220 protrudes from the second plate 21 along the Y-axis by a dimension equal to its height, and the second rib 320 protrudes from the third plate 31 along the Y-axis by a dimension equal to its height. In some embodiments, the height of the first rib 220 ranges from 0.2 mm to 1 mm, for example, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, or 0.9 mm. The height of the second rib 320 ranges from 0.2 mm to 1 mm. The heights of the first rib 220 and the second rib 320 can be much smaller than the thickness of each plate; for example, the height of the first rib 220 is less than one-sixth of the thickness of the first plate 21. The heights of the first rib structure 22, the second rib structure 32, and the height of the first rib structure 22 and the second rib structure 32 after pressing are all small, which can avoid too much interference with the overall assembly relationship of the three-layer welded structure 1110 and ensure that the contact area of ​​each of the first rib 220 or the second rib 320 is small.

[0059] refer to Figure 2 and Figure 5 The cross-sections of the first rib 220 and the second rib 320 are triangular. The first rib 220 and the second rib 320 can each be a triangular prism; when they abut, their edges meet, allowing for embedding to a certain depth. When the first rib 220 and the second rib 320 are made of different materials, the harder one can embed deeper into the softer one. The triangular prism structure helps to achieve contact points with smaller areas.

[0060] In some embodiments, the cross-sections of the first rib 220 and the second rib 320 are equilateral triangles, for example, equilateral triangles with side lengths of 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm. The first rib 220 and the second rib 320 have stable structures and small contact areas with each other.

[0061] In other embodiments, the cross-section of the rib has a sharp angle, that is, the rib has an edge. The side of the rib may have a certain curvature, such as being concave.

[0062] Multiple first ribs 220 can be parallel to each other, and multiple second ribs 320 can be parallel to each other. Parallel arrangement can achieve a denser and more uniform layout. For example, the outer contour of the first rib structure 22 can be rectangular, and the outer contour of the second rib structure 32 can also be rectangular, matching and substantially overlapping the outer contour of the first rib structure 22.

[0063] The first rib 220 and the second rib 320 can be perpendicular to each other. The first rib structure 22 and the second rib structure 32 can achieve a large number of dense contact points, essentially a rectangular array of multiple points, which helps to evenly resist the influence of different directions. Optionally, the included angle between the first rib 220 and the second rib 320 is greater than 80°.

[0064] For example, the first spacing between two adjacent first ribs 220 is less than the width of the first rib 220; the second spacing between two adjacent second ribs 320 is less than the width of the second rib 320, which enables a denser support point arrangement, allowing for more stable installation of the second connector 2 and the third connector 3. For example, the spacing is less than 0.3 mm, or the edge distance between two adjacent ribs is less than 0.6 mm. The first ribs 220 and the second ribs 320 may have the same cross-sectional shape and dimensions.

[0065] The first rib 220 may extend longer along the Z-axis than its width along the X-axis, and the second rib 320 may also extend considerably. The first rib 220 abuts against at least two corresponding second ribs 320, and the second rib 320 abuts against at least two corresponding first ribs 220. Each rib abuts against multiple corresponding ribs. The first ribs 220 and the second ribs 320 provide stable support and are in a balanced stress distribution.

[0066] refer to Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7The first through hole 201 and the first rib 220 of the second plate 21 are spaced apart in the XZ plane; the second through hole 301 and the second rib 320 of the third plate 31 are also spaced apart in the XZ plane. The second connector 2 and the third connector 3 are easy to manufacture, and the spacing can absorb manufacturing deviations, so the rib does not need to extend to the through hole. The diameter of the first through hole 201 and the diameter of the second through hole 301 can both be larger than the outer diameter of the welded column 12, and the second connector 2 and the third connector 3 can be easily assembled to the first connector 1.

[0067] For example, the materials of the first connector 1 and the third connector 3 can be the same. In other embodiments, the materials of the first connector 1 and the third connector 3 can be different. Optionally, the materials of the second connector 2 and the third connector 3 can also be different. The engagement depth of the first rib 220 and the second rib 320 can be affected by the materials, and the cooperation of the first rib structure 22 and the second rib structure 32 helps to solve the problem of squeaking noise caused by material incompatibility between the second connector 2 and the third connector 3.

[0068] refer to Figure 7 In the method of manufacturing the three-layer welded structure 1110, the second connector 2 can be disposed on the first connector 1, and the third connector 3 can be disposed on the second connector 2. The fusion weld column element 120 can protrude from the third plate 31. Exemplarily, the side of the third plate 31 facing away from the second plate 21... Figure 7 The upper side shown can be provided with a fusion-welding mating part, which can increase the fusion-welding area and improve the connection strength. (Reference) Figure 8 and Figure 1 After the welding process, the welded column 12 is fixed to the third connector 3.

[0069] In other embodiments, the welded column 12 and the third connector 3 can also be fixed in other ways.

[0070] refer to Figure 9 This application provides an automobile 1000, which includes a frame 1200 and a door panel assembly 1100. The door panel assembly 1100 can be the aforementioned door panel assembly 1100, which is disposed on the frame 1200, for example, to achieve a rotatable connection or a sliding connection.

[0071] The door panel assembly 1100 provided in this application may include at least one of the aforementioned three-layer welded structures 1110. The door panel assembly 1100 can integrate more components, and while achieving a more complex structure, it can achieve overall connection using the three-layer welded structure 1110. Moreover, it can effectively improve the problem of friction noise during use.

[0072] The Auto 1000 can integrate more functional components or achieve a more luxurious interior. It has less friction noise during operation and can provide a quieter and more comfortable riding experience.

[0073] The technical features of the above-disclosed embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] In the embodiments disclosed above, unless otherwise explicitly specified and limited, the execution order of each step is not restricted. For example, they can be executed in parallel or sequentially in different orders. The sub-steps of each step can also be executed alternately. Various forms of processes described above can be used, and steps can be reordered, added, or deleted, as long as the desired result of the technical solution provided in this application can be achieved, and this application does not impose any restrictions here.

[0075] The embodiments disclosed above merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of patent protection claimed by this application. Therefore, the scope of patent protection of this application should be determined by the appended claims.

Claims

1. A three-layer welded structure, characterized by, The first connecting piece comprises a first plate and a fusion welding column fixed to the first plate. The second connecting piece comprises a second plate and a first rib structure, the second plate is laminated to the first plate and sleeved on the fusion welding column, the first rib structure is arranged on the side of the second plate away from the first plate, and the first rib structure comprises a plurality of first ribs arranged at intervals. The third connecting piece comprises a third plate and a second rib structure, the third plate is laminated to the second plate, the third plate is fixed by fusion welding to the fusion welding column, the second rib structure is arranged on the side of the third plate facing the second plate, the second rib structure comprises a plurality of second ribs arranged at intervals, the extension direction of the second rib is crossed with the extension direction of the first rib, and the second rib and the first rib abut each other. The height of the first rib ranges from 0.2mm to 1mm, and the height of the second rib ranges from 0.2mm to 1mm. The first interval between two adjacent first ribs is smaller than the width of the first rib, and the second interval between two adjacent second ribs is smaller than the width of the second rib.

2. The three-layer welded structure of claim 1, wherein The cross section of the first rib and the cross section of the second rib are respectively regular triangles, the first rib abuts at least two corresponding second ribs, and the second rib abuts at least two corresponding first ribs.

3. The three-layer welded structure of claim 2, wherein A plurality of the first ribs are parallel to each other, a plurality of the second ribs are parallel to each other, and the first ribs and the second ribs are perpendicular to each other.

4. The three-layer welded structure of claim 1, wherein The second plate is provided with a first via hole, and the first rib has an interval from the first via hole; the third plate is provided with a second via hole, and the second rib has an interval from the second via hole.

5. The three-layer welded structure of claim 1, wherein The first connecting piece further comprises a support rib connected to the first plate and connected to the fusion welding column, and the support rib abuts the second connecting piece.

6. The three-layer welded structure of claim 1, wherein A plurality of the support ribs of the first connecting piece radially surround the fusion welding column.

7. The three-layer welded structure according to any one of claims 1 to 6, characterized by The first rib structure surrounds the fusion welding column, and the second rib structure surrounds the fusion welding column.

8. The three-layer welded structure of claim 7, wherein The size of the support rib along the fusion welding column is greater than the thickness of the second plate. The vehicle frame comprises a vehicle frame.

9. The three-layer welded structure of claim 7, wherein The door plate assembly comprises at least one three-layer welding structure as claimed in any one of claims 1 to 8, and the door plate assembly is arranged on the vehicle frame.

10. An automobile characterized by ​ ​ ​ ​

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