Metal plate welding structure

Abstract

The present invention relates to a welding structure, and in particular to a metal plate welding structure used as a structural member between thick plates, comprising a bottom plate (1) and a sub-plate (2), both of which are metal plates, and further comprising a sub-plate (3) arranged inside the sub-plate (2), wherein the lower surface of the sub-plate (2) is partially or completely in contact with the upper surface of the bottom plate (1), and the lower surface of the sub-plate (3) is completely in contact with the upper surface of the bottom plate (1), and the bottom plate (1), the sub-plate (3) and the sub-plate (2) are welded together by welding material. The structure is such that the outer edge of the sub-plate is welded to the bottom plate and the sub-plate at the same time, and the middle sub-plate is used to fill the structural weakness in the middle of the sub-plate. When the entire structural member is subjected to external forces in multiple directions, the forces can be transmitted to the middle sub-plate, so that the sub-plate is not easily deformed or buckled due to stress concentration, thereby improving the structural strength and stability of the entire welded component.

Description

Technical Field

[0001] The invention relates to a welding structure, in particular to a metal plate welding structure used as a structural member between thick plates. Background Art

[0002] Currently, traditional metal plate-to-metal plate connections primarily utilize end-to-end butt joints, resulting in straight welds along the edges of the plates. These welds typically perform well when subjected to forces parallel to the weld, but are susceptible to damage and cracks when subjected to forces perpendicular to the weld. However, in practical applications, structural components are widely used, many of which are subject to shear forces in various directions. Therefore, traditional end-to-end connections, with their straight welds, are unable to maintain stable connection performance under certain challenging conditions. Summary of the Invention

[0003] The present invention addresses the problem that in the prior art, two steel plates cannot be welded face to face and can only be welded between planes and ends or edges, that is, it can only solve the problem of face-end welding or end-end welding, and the welds formed when two metal plates are butt-jointed are mostly straight open welds. When they are subjected to external forces perpendicular to the welds, the weld parts are very susceptible to damage and cracks. The present invention provides a structure that is welded to the connecting bottom plate and the sub-plate at the same time through the outer edge of the sub-plate, and the middle sub-plate is used to fill the structural weakness of the middle part of the sub-plate caused by the hollowing out of the middle part of the traditional welded structure. When the entire structural member is subjected to multiple external forces in various directions, they can be transmitted to the middle sub-plate, making it less likely for the sub-plate to produce deformation and buckling caused by stress concentration, thereby improving the structural strength and stability of the entire welded component.

[0004] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0005] A metal plate welding structure includes a base plate and a sub-plate, both of which are metal plates, and further includes a secondary plate disposed within the sub-plate, wherein the lower surface of the secondary plate partially or completely abuts the upper surface of the base plate, and the lower surface of the secondary plate completely abuts the upper surface of the base plate, and the base plate, secondary plate, and sub-plate are welded together using welding material. Traditionally, structural parts are welded using lap welding or plug welding, and the weld formed when the two metal plates are butt-jointed is often a linear, non-closed weld. The connection structure is most stable when subjected to external forces parallel to the weld. However, many structural parts are often subjected to external forces in multiple directions during actual use. Therefore, such weld structures are very susceptible to damage and cracks.

[0006] At present, traditional structural parts cannot solve the surface welding and quality problems of steel plates. The present invention sets a secondary plate in the sub-plate, and then welds the outer edge of the secondary plate to connect the bottom plate and the sub-plate at the same time. The middle secondary plate fills the structural weakness in the middle of the sub-plate. When the entire structural part is subjected to external forces in all directions, they can be transmitted to the middle secondary plate through the closed weld. Part of the external forces can also offset each other on the middle secondary plate, making it difficult for the sub-plate to produce deformation and buckling caused by stress concentration, thereby reducing the occurrence of weld cracks.

[0007] Preferably, the sub-plate is provided with a hollowed-out cut surface having a shape similar to that of the outer edge of the secondary plate. The area of ​​the cut surface is larger than that of the secondary plate. The secondary plate is positioned within the cut surface. The outer edge of the secondary plate is welded to the inner edge of the secondary plate using a welding material. The distance between the outer edge of the secondary plate and the inner edge of the secondary plate is 0.5-2 times the thickness of the secondary plate. The cut surface is a hollowed-out portion formed after cutting within the sub-plate. The outer edge of the secondary plate is similar in shape to the inner edge of the cut surface within the sub-plate. A distance of 0.5-2 times the thickness of the sub-plate is left between the outer edge of the secondary plate and the inner edge of the cut surface within the sub-plate. The outer edge of the secondary plate and the inner edge of the cut surface within the sub-plate are welded together. The weld formed after welding is a closed-loop weld located within the sub-plate. When the welded structure is subjected to uneven external forces, the closed-loop weld can withstand external forces from all directions. Therefore, the weld has excellent performance as a structural component.

[0008] Preferably, the secondary plate is a sub-plate of the secondary plate. The secondary plate and the secondary plate are made of a single piece of material. There is one or more cutting grooves between the secondary plate and the secondary plate, and the secondary plate and the secondary plate are connected by a connecting section. The secondary plate is a portion of the secondary plate. The secondary plate is the remaining plate formed by cutting the secondary plate body. The secondary plate can be the entire plate remaining after the middle of the secondary plate is completely cut. The secondary plate can also be a sub-plate that is partially cut, leaving only one or more small connecting sections. The connecting sections are used to maintain the connection between the secondary plate and the secondary plate, so that the secondary plate can still be fixed in the middle of the secondary plate and prevent it from falling off naturally. Such a connecting section structure allows the secondary plate to remain after factory processing, which is more convenient during transportation, with high transportation efficiency and space utilization. At the same time, during subsequent welding, the secondary plate does not need to be placed in the secondary plate, positioned, or fixed in position, and can be directly welded. Compared with welding a single secondary plate, the transportation process is simple and convenient, welding is more time-saving and labor-saving, and welding efficiency is also higher.

[0009] To ensure the structural strength of surface-to-surface welding, if dot matrix welding is used, stress concentration will occur and the strength will be insufficient. If line welding is used, it will still be insufficient in surface-to-surface welding. However, if a large area of ​​closed, fully covered weld pads is used, the heat input will be extremely large, the deformation will be large, and the defects caused by the surrounding heat-affected zone will be large. This patent uses spaced welds within a larger outer area to radiate the entire area, and the secondary plates are retained between the welds through the connecting sections, thereby reducing the amount of welding and ensuring the welding connection strength of the entire larger area.

[0010] Preferably, the cutting grooves are of two or more sections, and the shortest distance between adjacent cutting grooves is 0.1-1 times the thickness of the sub-plate. When the distance between adjacent cutting grooves is greater than the thickness of the sub-plate, it is difficult to achieve full penetration during welding, affecting the welding effect. When the distance is less than 0.1 times the thickness of the sub-plate, the connection strength between the sub-plate and the middle sub-plate is low, making it easy for the sub-plate to fall off. Secondly, the connecting section is the sub-plate matrix material. When the welding material is welded to the connecting section, after it is fully penetrated, part of the matrix material and the welding material are fused together, so that the molten weld material at this location is between the matrix material of the sub-plate and sub-plate and the welding material, and its connection performance and effect with the sub-plate and sub-plate are better.

[0011] Preferably, the welding material is a welding rod or a welding wire, and the welding material is welded and melted to form a weld connecting the bottom plate, the auxiliary plate and the secondary plate.

[0012] Preferably, the weld is a closed-loop weld. Compared with straight-line welds or non-closed-loop welds, firstly, straight-line welds or non-closed-loop welds must have a starting point and an ending point. People who understand welding know that the starting point and the ending point are often the weakest points of the entire weld during welding, and are most likely to have problems first when subjected to external forces. However, closed-loop welds pass through the starting point during the welding process, so there is only one ending point, which reduces the weak points of the weld. Secondly, closed-loop welds allow the welded metal plate structure to transfer irregular external forces, especially circumferential forces, or external forces in multiple directions, to the middle secondary plate, making it less likely for the secondary plate to produce deformation and buckling caused by stress concentration, etc., making it very suitable for use in structural parts under complex working conditions.

[0013] Preferably, the sub-plates include a connecting sub-plate that is in contact with the upper surface of the base plate, and a bent sub-plate that is bent to form an angle with the connecting sub-plate. The connecting sub-plate is primarily used for connection to the base plate, while the bent sub-plate can be free and can also be used to connect to other components.

[0014] Preferably, the secondary plate is circular, elliptical, quadrilateral or triangular. Regardless of being circular, elliptical, quadrilateral or triangular, it is a closed figure, so the weld after welding includes at least one closed weld.

[0015] In the present invention, the thickness of the base plate and sub-plate is preferably at least 2mm. For surface-to-surface welding to achieve structural component function, the steel plates must have a certain thickness. When the steel plates are very thin, such as those less than 2mm thick, such as when connecting thin plates like automotive panels, they cannot be used as load-bearing structural components. Therefore, existing known technologies generally use an external direct penetration method without a weld chamber. This method uses high power to directly penetrate plate B externally, achieving a direct weld between plate B and plate A. Metal plates thicker than 2mm, used as structural components, generally cannot be penetrated by laser welding. Even after penetration, the weld quality is insufficient to withstand significant external forces, making them unusable as structural components.

[0016] Due to the adoption of the above technical solution, the present invention has significant technical effects: through the structure in which the outer edge of the secondary plate is simultaneously welded to the connecting bottom plate and the secondary plate, and the middle secondary plate is used to fill the middle of the secondary plate, the weak structure of the middle part of the secondary plate is avoided. When the entire structural member is subjected to external forces in various directions, the forces can be transmitted to the middle secondary plate, making it less likely for the secondary plate to produce deformation and buckling caused by stress concentration, thereby improving the structural strength of the entire welded component. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram before welding in Example 1 of the present invention

[0018] Figure 2 This is a schematic diagram of the welding process in Example 1 of the present invention.

[0019] Figure 3 This is a schematic diagram before welding in Example 2 of the present invention

[0020] Figure 4 This is a schematic diagram after welding in Example 2 of the present invention

[0021] Figure 5 This is a schematic diagram before welding in Example 3 of the present invention

[0022] Figure 6 This is a schematic diagram after welding in Example 3 of the present invention

[0023] Figure 7 This is a schematic diagram of the structure of the auxiliary board in Example 1 of the present invention

[0024] Figure 8 This is a tensile test diagram of the welded structure with and without intermediate secondary plates in the present invention.

[0025] Figure 9 This is a tensile test diagram of the intermediate plate in the present invention

[0026] The parts indicated by the numerical labels in the above drawings are as follows: 1 - bottom plate, 2 - sub-plate, 3 - secondary plate, 4 - weld, 21 - cutting surface, 22 - connecting sub-plate, 23 - cutting groove, 24 - connecting section, 25 - bent sub-plate. DETAILED DESCRIPTION

[0027] The following is combined with Figures 1 to 9 The present invention is described in further detail with examples:

[0028] Example 1

[0029] A metal plate welded structure, such as Figures 1 to 2 As shown, the structure includes a base plate 1 and a sub-plate 2. Both base plate 1 and sub-plate 2 are metal plates, and a secondary plate 3 is disposed within the secondary plate 2. The lower surface of the secondary plate 2 is completely aligned with the upper surface of the base plate 1, and the lower surface of the secondary plate 3 is completely aligned with the upper surface of the base plate 1. The base plate 1, secondary plate 3, and sub-plate 2 are welded together using welding material. The thickness of the base plate 1 and sub-plate 2 is 3 mm.

[0030] A hollow cutting surface 21 with a shape similar to that of the outer edge of the secondary plate 3 is provided in the secondary plate 2. The area of ​​the cutting surface 21 is larger than the area of ​​the secondary plate 3. The secondary plate 3 is placed in the cutting surface 21. The outer edge of the secondary plate 3 and the inner edge of the secondary plate 2 are welded together by welding material. The distance between the outer edge of the secondary plate 3 and the inner edge of the secondary plate 2 is equal to the thickness of the secondary plate 2.

[0031] After the middle of the auxiliary plate 2 is hollowed out, the secondary plate 3 can be placed in the hollowed-out cutting surface 21 and welded to the auxiliary plate 2 by welding rods or welding wires. At the same time, the lower surfaces of the secondary plate 3 and the auxiliary plate 2 are both in contact with the bottom plate 1.

[0032] During welding, weld seam 4 is welded to base plate 1. Therefore, only one welding operation is required to secure base plate 1, sub-plate 2, and secondary plate 3 together. This saves material, time, and operation, facilitating the connection and securing of the two steel plates. Furthermore, since secondary plate 3 is elliptical, the corresponding hollowed-out cut surface 21 is also elliptical. Therefore, after the welding material melts, weld seam 4 connecting base plate 1, sub-plate 2, and secondary plate 3 is also an elliptical closed-loop weld.

[0033] The advantage of a closed-loop weld is that the end point of welding passes through the starting point of welding. In the field of welding, the starting point and the end point are often weak points where stress is easily concentrated. Unlike traditional welding methods, the end point of the present invention passes through the starting point of welding, and there is actually only one end point. Compared with traditional welds, there are fewer stress concentration points and fewer defects. Secondly, the middle of the elliptical closed-loop weld is a secondary plate 3. The circular structure is more stable than the rectangular structure, especially when subjected to external force. When the circular closed-loop weld is subjected to external force at one point, it can effectively and evenly distribute and offset the external force through the original arc-shaped weld, especially since the secondary plate 3 is set in the middle of the closed-loop weld.

[0034] Similar to an egg, when an external force acts on the eggshell, the forces in all directions can be transmitted through the eggshell to the surrounding area and partially offset. If only the annular weld was used, the external forces it could withstand and offset were limited, and the forces were all applied to the weld. However, when a secondary plate 3 is integrated within the annular weld to fill the hollowed-out portion of the secondary plate 2, the center of the "egg" is filled to a certain extent. Compared with a hollow weld, its ability to withstand and decompose external stress is greatly improved, and its tensile strength is also improved. In particular, its compressive strength is more than 10 times that of the former, achieving results unexpected by those skilled in the art.

[0035] like Figure 8 As shown: Figure 8 The upper part is a welded structure with an intermediate secondary plate 3. During the tensile test, the welded structure broke on the parent material on the right side, indicating that the connection strength of the welded part is better than that of the parent material. The lower part is a traditional hollow ring welded structure. Also during the tensile test, the welded structure broke near the weld, indicating that the structural strength of the welded part is relatively weak.

[0036] like Figure 9 As shown, Figure 9 From top to bottom, the figure shows a circular weld with secondary plate 3, a square weld with secondary plate 3, and a square weld with a connecting section 24 between secondary plate 2 and secondary plate 3. During a tensile test, all three welds fractured in the parent metal, indicating that the welds are stronger than the parent metal. Therefore, the structure of the present invention offers higher strength and superior performance compared to traditional welding methods, such as hollow ring welding.

[0037] Example 2

[0038] like Figures 3 to 4 , Figure 7 As shown, the difference between this embodiment and embodiment 1 is:

[0039] The lower surface of the auxiliary plate 2 is partially in contact with the upper surface of the bottom plate 1, and the lower surface of the secondary plate 3 is completely in contact with the upper surface of the bottom plate 1. The bottom plate 1, secondary plate 3 and auxiliary plate 2 are welded together using welding material. The thickness of the bottom plate 1 and auxiliary plate 2 is 2 mm.

[0040] Secondary plate 3 is a sub-plate of secondary plate 2. Secondary plate 3 and secondary plate 2 are made of a single piece of material. One or more cutouts 23 are defined between the two plates, and the two plates are connected by a connecting section 24. Cutouts 23 are divided into two or more sections, and the shortest distance between adjacent cutouts 23 is 0.5 times the thickness of secondary plate 2. Secondary plate 3 is circular.

[0041] In this embodiment, the secondary plate 3 and the sub-plate 2 are made of a single piece of material. The secondary plate 3 is formed by cutting the sub-plate 2 with a connecting section 24, and the connection between the secondary plate 3 and the sub-plate 2 is not cut. Compared with cutting the secondary plate 3 completely from the sub-plate 2, the secondary plate 2 and the sub-plate 3 are connected together by the connecting section 24. Advantage 1: During transportation, the secondary plate 3 and the sub-plate 2 can be transported as a whole, which is more convenient. Advantage 2: During the later welding process, the secondary plate 3 and the sub-plate 2 can be directly welded without the need for positioning or docking, greatly improving welding efficiency. Advantage 3: The connecting section 24 is made of the sub-plate matrix material. When the welding material is welded to the connecting section 24, it is melted through and then fused with the welding material without distinguishing between the matrix material and the welding material. The molten weld material at this location is between the matrix material of the sub-plate and the secondary plate and the welding material, which improves the bonding performance and weld quality after welding with the sub-plate and the secondary plate.

[0042] Example 3

[0043] like Figure 5 、 6 As shown, the difference between this embodiment and embodiment 1 is:

[0044] The sub-plate 2 includes a connecting sub-plate 22 that is attached to the upper surface of the base plate 1, and a bent sub-plate 25 that forms an angle with the connecting sub-plate 22. If two flat steel plates are directly stacked and connected together, they are equivalent to a thicker steel plate, while the bent sub-plate 25 is mainly used for connection with other components or other functions.

[0045] In short, the above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A metal plate welding structure, comprising a bottom plate (1) and a sub-plate (2), wherein both the bottom plate (1) and the sub-plate (2) are metal plates, characterized in that: The invention also includes a secondary plate (3) arranged in the secondary plate (2), wherein the lower surface of the secondary plate (2) is partially or completely in contact with the upper surface of the bottom plate (1), and the lower surface of the secondary plate (3) is completely in contact with the upper surface of the bottom plate (1), and the bottom plate (1), the secondary plate (3) and the secondary plate (2) are welded together by welding material; the secondary plate (3) is a sub-plate of the secondary plate (2), the secondary plate (3) and the secondary plate (2) are made of a single piece of material, and more than one cutting groove (23) is provided between the secondary plate (2) and the secondary plate (3), and the secondary plate (2) and the secondary plate (3) are connected by a connecting section (24).

2. The metal plate welding structure according to claim 1, characterized in that: The cutting grooves (23) are divided into two or more sections, and the shortest distance between adjacent cutting grooves (23) is 0.1 to 1 times the thickness of the auxiliary plate (2).

3. The metal plate welding structure according to claim 1, characterized in that: The welding material is a welding rod or a welding wire, and after the welding material is welded and melted, a weld (4) connecting the bottom plate (1), the auxiliary plate (2) and the secondary plate (3) is formed.

4. The metal plate welding structure according to claim 3, characterized in that: The weld (4) is a closed-loop weld.

5. The metal plate welding structure according to claim 1, characterized in that: The sub-plate (2) comprises a connecting sub-plate (22) fitted with the upper surface of the bottom plate (1), and a bent sub-plate (25) bent to form an angle with the connecting sub-plate (22).

6. The metal plate welding structure according to claim 1, characterized in that: The secondary plate (3) is circular, elliptical, quadrilateral or triangular.

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