Foot support structure and welding structure

Abstract

The invention provides a kickstand structure and a welding structure, the kickstand structure comprises a connecting metal plate, a stress metal plate and a side plate, the connecting metal plate is in welded connection with a frame, the stress metal plate is in welded connection with the connecting metal plate, and the side plate is in welded connection with the connecting metal plate and the stress metal plate at the same time. The welding structure comprises an upper side welding seam, a lower side welding seam, a welding seam a, a welding seam b, a welding seam c, a welding seam d, a welding seam e and a welding seam f, the upper side welding seam and the lower side welding seam are used for achieving welding connection between the connecting metal plate and the frame, the welding seam a and the welding seam b are used for achieving welding connection between the side plate and the connecting metal plate, and the welding seam c and the welding seam d are used for achieving welding connection between the side plate and the stress metal plate. The e welding seam and the f welding seam are used for achieving welding connection of the stress metal plate and the connecting metal plate. The rigidity and stress of the joint of the kickstand and the frame can be reduced, and the fatigue life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motorcycle kickstands, and in particular to a kickstand structure and a welding structure. Background Art

[0002] As of 2022, there are more than 350 million motorcycles (including electric motorcycles) in China. Motorcycles have become a popular means of transportation due to their convenience and flexibility. In particular, the rise of the food delivery industry has accelerated the development of the motorcycle industry. How to make a product that can adapt to high-intensity use has become the goal that the industry continues to pursue. For transportation, there are roughly two working conditions: movement and parking, so the importance of the motorcycle kickstand can be imagined. At present, the motorcycle industry often uses Figure 1 The welded structure between the kickstand and the frame shown uses an extended weld. This weld type is intended to transfer stress concentration at the weld-to-sheet metal connection to the frame. However, motorcycle frames are typically only about 2mm thick and cannot withstand such a high stress concentration, so fatigue failure often occurs at this location. Therefore, this structure no longer meets operational requirements. Summary of the Invention

[0003] According to the above-mentioned technical problems that the welded structure connecting the existing motorcycle kickstand and frame has a short service life, large stress concentration and a complicated welding process, a kickstand structure and a welding structure are provided. Through topological optimization and simulation analysis, the stiffness and stress of the connection between the kickstand and the frame are reduced and the fatigue life is improved.

[0004] The technical means adopted in the present invention are as follows: A foot support structure includes: a connecting sheet metal, a stress-bearing sheet metal and a side plate, wherein the connecting sheet metal is welded to the frame, the stress-bearing sheet metal is welded to the connecting sheet metal, and the side plate is welded to both the connecting sheet metal and the stress-bearing sheet metal.

[0005] Furthermore, the connecting sheet metal is located on the upper side of the axis I of the frame.

[0006] Furthermore, the material of the connecting sheet metal, the stress-bearing sheet metal and the side panel is Q235B.

[0007] The present invention also provides a welding structure of a foot support structure, including an upper side weld, a lower side weld, a weld, b weld, c weld, d weld, e weld and f weld, the upper side weld and the lower side weld are used to realize the welding connection between the connecting sheet metal and the frame, the a weld and b weld are used to realize the welding connection between the side panel and the connecting sheet metal, the c weld and d weld are used to realize the welding connection between the side panel and the load-bearing sheet metal, and the e weld and f weld are used to realize the welding connection between the load-bearing sheet metal and the connecting sheet metal.

[0008] Furthermore, the length of the upper weld does not exceed the starting point of the fillet connecting the sheet metal, and the weld throat does not exceed 4mm; the length of the lower weld exceeds the ending point of the fillet connecting the sheet metal by 2-3mm, and the weld throat does not exceed 4mm.

[0009] Furthermore, the weld throats of the upper weld and the lower weld are 3-4 mm.

[0010] Furthermore, the weld throat lengths of welds a and b are 3-4 mm, and the weld toe lengths are greater than the weld throat lengths.

[0011] Furthermore, the throat lengths of the welds c and d are 3-4 mm, and the welding length is greater than the throat length.

[0012] Furthermore, the weld throat length of the e weld is 9~9.5mm, and the weld toe length is consistent with the side length of the stressed sheet metal; the weld throat length of the f weld is 6~7mm, and the weld toe length is consistent with the side length of the stressed sheet metal.

[0013] Furthermore, each welding connection adopts argon arc welding.

[0014] Compared with the prior art, the present invention has the following advantages: 1. The foot support structure and welding structure provided by the present invention reduce the stiffness and stress of the connection between the foot support and the frame and improve the fatigue life through topological optimization and simulation analysis.

[0015] 2. The foot support structure and welding structure provided by the present invention can improve the fatigue strength of the foot support structure, reduce stress concentration, and optimize the welding steps, so that it can adapt to high-intensity use and enhance the user's driving experience. The required parts are simpler than the existing technology, saving production costs.

[0016] 3. The foot support structure and welded structure provided by the present invention connect the sheet metal used to transition between the frame, the load-bearing sheet metal, and the side panels, evenly distributing the frame's stress and enhancing the structure. The load-bearing sheet metal withstands pressure from the foot support and transmits it to the frame. The side panels distribute the pressure on the load-bearing sheet metal, preventing it from deforming under prolonged pressure.

[0017] 4. The foot support structure and welding structure provided by the present invention, the upper weld and the lower weld can reduce the stress concentration of the foot support on the frame and improve the fatigue life of the overall structure.

[0018] 5. The foot support structure and welding structure provided by the present invention use argon arc welding as the welding method. Compared with connection methods such as bolts, welding is lighter and can improve the safety of thin plate structures.

[0019] 6. The foot support structure and welding structure provided by the present invention design the connecting sheet metal into a slender shape, which can avoid excessive crossing over the tension area or being outside the tension area. Stretching the load-bearing sheet metal 3022 can also disperse the pressure.

[0020] Based on the above reasons, the present invention can be widely promoted in the fields of motorcycles and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a schematic diagram of the currently widely used foot support structure and welding structure.

[0023] Figure 2 This is a front view of the foot support structure and welding structure of the present invention.

[0024] Figure 3 It is a front view of the foot support structure and welding structure of the present invention.

[0025] Figure 4 This is a bottom view of the foot support structure and welding structure of the present invention.

[0026] Figure 5 This is a top view of the foot support structure and welding structure of the present invention.

[0027] Figure 6 This is a left side view of the bicycle frame without the foot support structure and welding structure of the present invention.

[0028] Figure 7 This is a right side view of the bicycle frame without the foot support structure and welding structure of the present invention.

[0029] Figure 8 The top view of the bicycle frame without the foot support structure and welding structure of the present invention.

[0030] Figure 9 This is a bottom view of the bicycle frame without the foot support structure and welding structure of the present invention.

[0031] Figure 10 It is a partial dimension diagram of connecting sheet metals of the present invention.

[0032] Figure 11 Schematic diagram of the bending rate of the side panel of the present invention.

[0033] Figure 12 Schematic diagram of the bending rate of the stressed sheet metal of the present invention.

[0034] Figure 13 This is a columnar comparison diagram of the maximum Mises stress of the original foot support under the ultimate load of the present invention and the present invention.

[0035] Figure 14 It is a columnar comparison diagram of the equivalent plastic deformation of the original foot support and the invention under the ultimate load of the invention.

[0036] Figure 15 This is a bar graph comparing the fatigue life of the original foot brace and the present invention under four-point bending load.

[0037] Figure 16 This is a comparative chart of fatigue life of the original kickstand and the kickstand of the present invention under the working condition of a complete vehicle.

[0038] In the figure: 302, frame; 3021, connecting sheet metal; 3022, load-bearing sheet metal; 3023, side panel; 3024, upper side weld; 3025, lower side weld; 3026, weld a; 3027, weld b; 3028, weld c; 3029, weld d; 3030, weld e; 3031, weld f. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0044] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0046] Example 1 Please refer to Figure 2-12 The present invention provides a motorcycle kickstand structure, specifically comprising a frame 302 (2mm thick), a connecting sheet metal 3021 (2mm thick), a load-bearing sheet metal 3022 (8mm thick), and side panels 3023 (2mm thick). The connecting sheet metal 3021 is welded to the frame 302, the load-bearing sheet metal 3022 is welded to the connecting sheet metal 3021, and the side panels 3023 are welded to both the connecting sheet metal 3021 and the load-bearing sheet metal 3022. The frame 302 supports the entire kickstand structure; the connecting sheet metal 3021 serves as a transition between the frame 302, the load-bearing sheet metal 3022, and the side panels 3023, evenly distributing the frame's load and enhancing the structure. The stress-bearing sheet metal 3022 is used to bear the pressure from the foot support and transmit the force from the foot support to the frame 302; in order to disperse the pressure on the stress-bearing sheet metal 3022 and prevent it from deforming under long-term pressure, the present invention adds a side plate 3023 next to the stress-bearing sheet metal 3022.

[0047] The present invention also provides a welding structure for a foot support structure, including an upper weld 3024 (throat diameter of 3-4 mm), a lower weld 3025 (throat diameter of 3-4 mm), a weld a 3026 (throat diameter of 3-4 mm), a weld b 3027 (throat diameter of 3-4 mm), a weld c 3028 (throat diameter of 3-4 mm), a weld d 3029 (throat diameter of 3-4 mm), an weld e 3030 (throat diameter of 9-9.5 mm), and a weld f 3031 (throat diameter of 6-7 mm). Upper weld 3024 and lower weld 3025 are used to connect the overall foot support structure to the vehicle frame 302, achieving a welded connection between the sheet metal 3021 and the vehicle frame 302. This reduces stress concentration on the foot support structure and improves the fatigue life of the overall structure. Upper weld 3024 and lower weld 3025 are located on the upper and lower sides of the connecting sheet metal 3021. Weld a 3026 and weld b 3027 are used to connect the side plate 3023 and the connecting sheet metal 3021. Weld a 3026 and weld b 3027 are distributed on both sides of the connection. The throat length of weld a 3026 and weld b 3027 is 3~4mm, and the weld toe length can be greater than the throat. Weld c 3028 and weld d 3029 are used to connect the side plate 3023 and the load-bearing sheet metal 3022. Weld c 3028 and weld d 3029 are distributed on both sides of the connection. Weld c 3028 and weld d 3029 The weld throat length is 3~4mm, and the welding length can be greater than the weld throat; e weld 3030 and f weld 3031 are used to connect the stressed sheet metal 3022 and the connecting sheet metal 3021. e weld 3030 and f weld 3031 are distributed on both sides of the connection. Since they are the main stress-bearing components, the weld throat length of e weld 3030 is 9~9.5mm, and the weld toe length is consistent with the side length of the stressed sheet metal 3022. The weld throat length of f weld 3031 is 6~7mm, and the weld toe length is consistent with the side length of the stressed sheet metal 3022.

[0048] In the present invention, the kickstand structure further includes a kickstand limiting portion, a hole for mounting the kickstand rod, and a limiting hole for folding the kickstand rod. The aforementioned limiting and mounting structures are present in the prior art of motorcycle kickstands and will not be described in detail here.

[0049] In the present invention, it is required that the connecting sheet metal 3021 should avoid having more than half of its structural welding exceed the lower side of the axis I of the frame 302, and preferably the entire structure should be above the axis I. To ensure that the motorcycle can park stably on the ground, when adjusting the connecting sheet metal 3021, it is also necessary to adjust the angle formed by the load-bearing sheet metal 3022 and the ground according to actual needs.

[0050] In the present invention, the length of the upper weld 3024 should not exceed the start of the fillet of the connecting sheet metal 3021, and the weld throat should be strictly limited to no more than 4mm. The lower weld 3025 only needs to extend 2-3mm beyond the end of the fillet of the connecting sheet metal 3021, and the weld throat should also be strictly limited to no more than 4mm.

[0051] Example 2 The purpose of the present invention is to provide a new kickstand structure and welding structure for motorcycles, which can improve the fatigue strength of the kickstand structure, reduce stress concentration, and optimize the welding steps, so that it can adapt to high-intensity use and enhance the user's driving experience. The required components are simpler than the existing technology, saving production costs.

[0052] like Figure 2-12 As shown, the foot support structure of the present invention is composed of a frame 302 (thickness is 2 mm), a connecting sheet metal 3021 (thickness is 2 mm), a load-bearing sheet metal 3022 (thickness is 8 mm), and a side plate 3023 (thickness is 2 mm). The welding structure of the present invention is composed of an upper weld 3024 (weld throat is 3-4 mm), a lower weld 3025 (weld throat is 3-4 mm), a weld 3026 (weld throat is 3-4 mm), b weld 3027 (weld throat is 3-4 mm), c weld 3028 (weld throat is 3-4 mm), d weld 3029 (weld throat is 3-4 mm), e weld 3030 (weld throat is 9-9.5 mm), and f weld 3031 (weld throat is 6-7 mm).

[0053] The materials of all components of the structure of the present invention are steel code-named Q235B, and the welding method used is argon arc welding. Compared with connection methods such as bolts, welding is lighter and can improve the safety of thin plate structures. At present, robot welding (such as automobile production lines) has greatly improved efficiency, reduced labor costs, and has efficient production and economy. In addition, welding can also form high-strength and permanent connections. The frame 302 is made of seamless steel pipe with a thickness of 2mm. The length L of the connecting sheet metal 3021 is 90mm, the thickness is 2mm, the inner arc diameter is 48mm, the curvature is 66°, and the fillet diameter is 12mm (radius R=6mm). Figure 10 As shown. The connection method of the connecting sheet metal 3021 and the frame 302 is welding, and the welding positions of the two components are based on the connecting sheet metal 3021. There are two welding positions, the upper weld 3024 and the lower weld 3025, and the weld throat lengths of the upper weld 3024 and the lower weld 3025 are both 3-4mm. The connection method of the side panel 3023 and the connecting sheet metal 3021 is welding, and the connecting welds are weld a 3026 and weld b 3027, and the weld throat lengths of weld a 3026 and weld b 3027 are both 3~4mm. The sheet metal length of the side panel 3023 is 65mm, the thickness is 2mm, the width is 50mm, and the bending rate is 60°, as shown Figure 11 As shown. The connection method of the stressed sheet metal 3022 and the connecting sheet metal 3021 is welding. The connecting welds are e weld 3030 and f weld 3031. The throat lengths of e weld 3030 and f weld 3031 are 9~9.5mm and 6~7mm respectively. The stressed sheet metal 3022 is 68mm long, 8mm thick, 66mm wide, and has a bending rate of 20°. Figure 12 As shown, the diameter of the hole connecting the foot support is 12 mm. The load-bearing sheet metal 3022 and the side plate 3023 are connected by welding. The connecting welds are weld c 3028 and weld d 3029, respectively. The weld throat lengths of weld c 3028 and weld d 3029 are both 3-4 mm.

[0054] Analyzing the motorcycle kickstand, the kickstand is mainly in two working conditions: the motorcycle is moving and the motorcycle is stationary. When the motorcycle is moving, the kickstand is in periodic fatigue vibration. At this time, the force on the kickstand comes from the periodic mechanical vibration transmitted by the frame and the bending moment generated by the weight of the passengers and the body. In this case, the force environment in which the kickstand is located is equivalent to a four-point bending load condition. For a 48mm diameter tube, it is extremely dangerous in the tension area, and these places need to be missed when designing the connecting sheet metal. Furthermore, the present invention designs the connecting sheet metal 3021 into a slender shape to avoid crossing the tension area too much or not being in the tension area. Furthermore, the upper side weld 3024 and the lower side weld 3025 play a vital role in this case. This design layout of the present invention can evenly distribute the force on the frame 302 and the connecting sheet metal 3021. When the motorcycle is stationary, the kickstand is in a static load pressure condition. At this time, the stressed sheet metal 3022 plays the role of receiving and transmitting force. In order to adapt to the slender connecting sheet metal 3021, the present invention stretches the stressed sheet metal 3022, which can also disperse the pressure.

[0055] The present invention can reduce stress concentration: using finite element analysis method, the FEA model adopts C3D8M unit, and conducts static analysis under extreme load on the original foot support and the present invention. Figure 13 The bar graph with Max Mises Stress [Mpa] (maximum Mises stress, in MPa) as the y-axis shows that the maximum Mises stress of the original foot support is approximately 854 MPa, while the maximum Mises stress of the present invention is approximately 766 MPa. This comparison shows that the present invention can reduce the maximum Mises stress experienced by the structure. Taking the tensile strength of 400 MPa, code-named Q235B material, as the limit, it is found that the area of ​​the present invention exceeding the limit is significantly smaller than that of the original foot support. Taking the yield strength of 235 MPa, code-named Q235B material, as the limit, it is found that except for some small areas with singular stress, the present invention does not have stress exceeding the limit in other areas. However, the original foot support has a large area exceeding the yield strength. In addition to comparing stress conditions, PEEQ (Plastic Equivalent Strain) is an indispensable plastic analysis indicator, which is used to quantify deformation and damage and also provides a key criterion for failure prediction. Reasonable use of PEEQ results can significantly improve the accuracy of simulation predictions of material nonlinear behavior, which is especially valuable in the analysis of automobile collision, metal forming, structural limit load and other fields. According to the material properties of Q235B, under the limit load, the equivalent plastic deformation is set to 0.33 as the limit. Figure 14The bar graph with PEEQ as the y-axis shows that the maximum equivalent plastic strain of the present invention under extreme load conditions is 0.118, while the maximum equivalent plastic strain of the original leg brace is 0.488, clearly exceeding the limit equivalent plastic strain. In summary, it can be seen that the present invention significantly reduces stress concentration compared to the original leg brace.

[0056] The present invention can improve fatigue life: Because the force on the motorcycle kickstand can be simplified to four-point bending load when analyzing the kickstand, in order to simplify the experiment and time cost, it is necessary to first complete the preliminary fatigue life evaluation and comparison in the four-point bending force control test. When evaluating fatigue life, the test adopts the equivalent structural stress method which is currently more accurate in estimation. Figure 15 As shown in the bar graph with fatigue life [cycles] as the y-axis, it can be found that the estimated fatigue life of the original kickstand in the four-point bending test under a load of 7000N is 10w, while the estimated fatigue life of the present invention is 32w, a three-fold increase, indicating that the present invention has excellent fatigue resistance. Furthermore, the present invention and the original kickstand were placed on the entire vehicle for fatigue life evaluation. Figure 16 As shown in the bar graph with fatigue life [cycles] on the y-axis, the original kickstand had an estimated fatigue life of 128 weeks in the vehicle fatigue test, while the proposed structure achieved an estimated fatigue life of 300 weeks, a nearly threefold improvement. In summary, it can be concluded that the proposed structure significantly improves fatigue resistance. Compared to the original kickstand, the proposed structure significantly increases fatigue life.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A foot support structure, characterized in that: include: A connecting sheet metal (3021), a stressed sheet metal (3022), and a side plate (3023); the connecting sheet metal (3021) is welded to the vehicle frame (302); the stressed sheet metal (3022) is welded to the connecting sheet metal (3021); and the side plate (3023) is simultaneously welded to the connecting sheet metal (3021) and the stressed sheet metal (3022).

2. The foot support structure according to claim 1, characterized in that: The connecting sheet metal (3021) is located on the upper side of the axis I of the vehicle frame (302).

3. The foot support structure according to claim 1, characterized in that: The connecting sheet metal (3021), the stress-bearing sheet metal (3022) and the side plate (3023) are made of Q235B.

4. A welding structure of a foot support structure according to any one of claims 1 to 3, characterized in that: The invention comprises an upper side weld (3024), a lower side weld (3025), a weld (3026), a weld (3027), a weld (3028), a weld (3029), an e weld (3030) and an f weld (3031), wherein the upper side weld (3024) and the lower side weld (3025) are used to realize the welding connection between the sheet metal (3021) and the frame (302), and the a weld (30 The a weld (3026) and b welds (3027) are used to realize the welding connection between the side plate (3023) and the connecting sheet metal (3021), the c weld (3028) and d welds (3029) are used to realize the welding connection between the side plate (3023) and the stressed sheet metal (3022), and the e weld (3030) and f welds (3031) are used to realize the welding connection between the stressed sheet metal (3022) and the connecting sheet metal (3021).

5. The welding structure according to claim 4, characterized in that: The length of the upper weld (3024) does not exceed the starting point of the fillet of the connecting sheet metal (3021), and the weld throat does not exceed 4 mm; the length of the lower weld (3025) exceeds the ending point of the fillet of the connecting sheet metal (3021) by 2-3 mm, and the weld throat does not exceed 4 mm.

6. The welding structure according to claim 5, characterized in that: The weld throats of the upper weld (3024) and the lower weld (3025) are 3 to 4 mm.

7. The welding structure according to claim 4, characterized in that: The throat lengths of the weld seams a (3026) and b (3027) are 3-4 mm, and the weld toe lengths are greater than the weld throat lengths.

8. The welding structure according to claim 4, characterized in that: The throat lengths of the c weld (3028) and the d weld (3029) are 3 to 4 mm, and the welding length is greater than the throat length.

9. The welding structure according to claim 4, characterized in that: The weld throat length of the e weld (3030) is 9-9.5 mm, and the weld toe length is consistent with the side length of the stressed sheet metal (3022); the weld throat length of the f weld (3031) is 6-7 mm, and the weld toe length is consistent with the side length of the stressed sheet metal (3022).

10. The welding structure according to claim 4, characterized in that: The welding method used for each welding connection is argon arc welding.

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