Foamed aluminum composite structure and preparation method thereof

Abstract

According to the foamed aluminum composite structure and the preparation method thereof, a connecting cylinder body is assembled in a second through hole, a connecting plate body is assembled in a first through hole, and the outer edge of the connecting plate body is welded, so that the welding contact area is increased, welding stress is dispersed, meanwhile, an inserting plate is matched with an inserting groove, mechanical connection and welding connection are combined, and the overall connection strength is improved; the step portion structure enables heat distribution to be more uniform during welding, the defects of cracks, air holes and the like caused by heat stress concentration are reduced to a certain extent, matching of the inserting plate and the inserting groove assists positioning, the position is more accurate during welding, the risks of incomplete penetration and incomplete fusion are reduced, matching of the connecting cylinder and the through hole and matching of the inserting plate and the inserting groove achieve accurate assembly, and the welding quality is improved. The relative positions of the foamed aluminum body and the aluminum alloy structural part are accurate, welding operation is facilitated, and stable welding quality is guaranteed. The connecting plate body is matched with the step part, stable supporting is formed on the structure, the stability of the composite structure during stress is improved, and the problem of welding deformation caused by an unreasonable structure is solved.

Description

Technical Field

[0001] The present application relates to the technical field of foam aluminum composite structures, and in particular to a foam aluminum composite structure and a preparation method thereof. Background Art

[0002] Foamed aluminum is a porous metal material made of aluminum alloy foam. It has the advantages of high specific strength, good fire resistance, and low density, making it suitable for use as a weight-reducing material in structures. However, due to its unique porous structure, it has low absolute strength and poor processing performance, making it difficult to use as a structural part.

[0003] At present, in order to use foam aluminum as a structural part, the solution adopted is to increase the density of foam aluminum as much as possible. The solution of increasing the density of foam aluminum as much as possible to increase the strength of foam aluminum is adopted, so that foam aluminum can be used as a structural part. There are disadvantages: ① The density of foam aluminum needs to reach more than 1.0g / cm3, and the strength can reach tens of megapascals. The strength is still lower than that of aluminum alloy, the density is larger, and the lightweight effect is reduced. ② Foam aluminum has poor nail holding force, cannot process threaded holes, and has poor welding performance, which makes it more complicated to combine with other parts during use.

[0004] Therefore, in order to realize the assembly and use of foam aluminum as a structural part, the aluminum alloy part is connected to the foam aluminum as the main structural part, and the corresponding assembly structure is set on the aluminum alloy part to realize the assembly of the aluminum alloy and the foam aluminum as an integral structure, so as to improve the performance of the foam aluminum. However, foam aluminum has a porous structure. When welding with dense aluminum alloy parts, the heat transfer and molten pool formation are different from conventional metal welding. The pores in foam aluminum will make it difficult for gas to escape during welding, and it is easy to produce defects such as pores and slag inclusions, which will affect the welding quality and connection strength. Furthermore, the high temperature during welding may change the microstructure of foam aluminum. For example, the pore structure of foam aluminum may collapse or deform in the heat-affected zone, thereby destroying the original special properties of foam aluminum such as energy absorption and sound insulation, and reducing its comprehensive performance. There are differences in the thermophysical properties of aluminum alloy and foam aluminum. Due to the inconsistent thermal expansion and contraction during welding, large welding deformation is likely to occur, which will affect the dimensional accuracy and assembly accuracy of the component, and may require subsequent correction processes, increasing production costs and processing difficulties. Summary of the invention

[0005] In an exemplary embodiment of the present application, a foam aluminum composite structure and a preparation method thereof are provided to improve the overall strength of the foam aluminum composite structure during the preparation process.

[0006] The present application provides a foam aluminum composite structure, which comprises: a foam aluminum body and an aluminum alloy structural member, wherein the foam aluminum body is welded to the aluminum alloy structural member, and an assembly portion is arranged on the aluminum alloy structural member; The foam aluminum body is provided with a connecting countersunk hole, the connecting countersunk hole includes a first through hole and a second through hole, the first through hole and the second through hole penetrate each other, the axis of the first through hole coincides with the axis of the second through hole, the first through hole is located above the second through hole, the inner diameter of the first through hole is larger than the inner diameter of the second through hole to form a step portion between the first through hole and the second through hole, the step portion is close to the top surface of the first through hole and a slot is provided, and the opening of the slot faces upward; The aluminum alloy structural member comprises a connecting cylinder, a connecting plate and a plug plate, wherein the connecting plate is arranged on the outer wall of the connecting cylinder and extends in the horizontal direction, the outer diameter of the connecting plate is larger than the outer diameter of the connecting cylinder, the assembly portion is arranged inside the connecting cylinder, and the plug plate is arranged at the lower part of the connecting plate and is perpendicular to the connecting plate; The connecting cylinder is assembled in the second through hole, the connecting plate is assembled in the first through hole, and the outer edge of the connecting plate is welded to the outer edge of the first through hole, and the plug plate is matched with the slot.

[0007] Furthermore, the slot is located between an inner wall of the first through hole and an inner wall of the second through hole.

[0008] Furthermore, the plug plate is located between the outer wall of the connecting cylinder and the outer wall of the connecting plate body.

[0009] Furthermore, the plug plate is arranged around the periphery of the connecting cylinder, and the cross-sectional shape of the plug plate along the vertical direction is a rectangle, and the ratio of the height dimension to the width dimension of the rectangle is in the range of 5-10.

[0010] Furthermore, the plug board is provided with heat conduction holes, a plurality of the heat conduction holes are arranged through the plug board and are arranged at intervals in the circumferential direction of the plug board, and a serrated groove is provided at the bottom of the plug board.

[0011] Furthermore, the height dimension of the plug plate is smaller than the height dimension of the connecting cylinder.

[0012] The present invention application also provides a method for preparing a foam aluminum composite structure, which is used to prepare the above-mentioned foam aluminum composite structure, and includes: assembling a connecting cylinder into a second through hole, assembling a connecting plate into a first through hole, matching an insert plate with the slot, and welding an outer edge of the connecting plate to an outer edge of the first through hole.

[0013] The embodiments of the present application have the following beneficial effects: the connecting cylinder is assembled in the second through hole, the connecting plate is assembled in the first through hole and the outer edge is welded, which increases the welding contact area and disperses the welding stress. At the same time, the plug plate cooperates with the slot to realize the combination of mechanical connection and welding connection, and improves the overall connection strength. The step structure makes the heat distribution more uniform during welding, and reduces the defects such as cracks and pores caused by thermal stress concentration to a certain extent. The cooperation between the plug plate and the slot assists in positioning, making the position more accurate during welding and reducing the risk of incomplete welding and incomplete fusion. The cooperation between the connecting cylinder and the through hole, the plug plate and the slot realizes precise assembly, ensures the accurate relative position of the foam aluminum body and the aluminum alloy structural parts, facilitates welding operation, and ensures stable welding quality. The connecting plate cooperates with the step to form a stable support in the structure, improves the stability of the composite structure when subjected to force, and reduces deformation problems caused by unreasonable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 The structural schematic diagram of a foam aluminum composite structure provided in an embodiment of the present application is exemplarily shown; Figure 2 A schematic cross-sectional view of a foam aluminum composite structure provided in an embodiment of the present application in the AA direction is exemplarily shown; Figure 3 The partial structural diagram of the plug board provided in the embodiment of the present application is exemplarily shown. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0017] To further illustrate the technical solution provided by the embodiment of the present application, this is described in detail below in conjunction with the accompanying drawings and specific implementation methods. Although the embodiment of the present application provides the method operation steps shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided in the embodiment of the present application.

[0018] refer to Figure 1-3As shown, the present application provides a foam aluminum composite structure, which includes: a foam aluminum body 10 and an aluminum alloy structural member 20 , the foam aluminum body 10 is welded to the aluminum alloy structural member 20 , and an assembly portion 24 is provided on the aluminum alloy structural member 20 .

[0019] A connecting countersunk hole 11 is set on the foam aluminum body 10, and the connecting countersunk hole 11 includes a first through hole 111 and a second through hole 112. The first through hole 111 and the second through hole 112 penetrate each other, and the axis of the first through hole 111 coincides with the axis of the second through hole 112. The first through hole 111 is located above the second through hole 112, and the inner diameter of the first through hole 111 is larger than the inner diameter of the second through hole 112.

[0020] The foam aluminum body 10 is provided with a connection countersunk hole 11, which is composed of a first through hole 111 and a second through hole 112. The first through hole 111 and the second through hole 112 penetrate each other, and the axes of the two coincide. This design ensures that the aluminum alloy structural member 20 can be accurately assembled into the foam aluminum body 10, ensuring the coaxiality and stability of the entire composite structure.

[0021] The first through hole 111 is located above the second through hole 112, and its inner diameter is larger than the inner diameter of the second through hole 112. The larger inner diameter allows the connecting plate body 22 to be smoothly assembled therein, providing sufficient operating space for welding. At the same time, the cooperation between the first through hole 111 and the connecting plate body 22 increases the contact area between the two, which helps to improve the firmness of welding and the overall strength of the composite structure.

[0022] The second through hole 112 is mainly used for assembling the connecting cylinder 21. Its inner diameter is adapted to the outer diameter of the connecting cylinder 21, so that the connecting cylinder 21 can be tightly embedded therein, further enhancing the connection stability between the foam aluminum body 10 and the aluminum alloy structural member 20.

[0023] A step portion is formed between the first through hole 111 and the second through hole 112. A slot 113 is provided on the top surface of the step portion close to the first through hole 111, and the opening of the slot 113 faces upward. The slot 113 is located between the inner wall of the first through hole 111 and the inner wall of the second through hole 112. Since the first through hole 111 and the second through hole 112 have different inner diameters, a step portion is formed between them. A slot 113 is provided on the top surface of the step portion close to the first through hole 111, and the opening of the slot 113 faces upward and is located between the inner wall of the first through hole 111 and the inner wall of the second through hole 112.

[0024] The slot 113 cooperates with the insert plate 23 of the aluminum alloy structural member 20, which not only provides a positioning function for the insert plate 23 to ensure the accuracy of the welding position, but also can enhance the mechanical connection between the two during the welding process, further improving the overall performance of the composite structure.

[0025] The aluminum alloy structural member 20 includes a connecting cylinder 21, a connecting plate 22 and a plug plate 23. The connecting plate 22 is arranged on the outer wall of the connecting cylinder 21 and extends in the horizontal direction. The outer diameter of the connecting plate 22 is larger than the outer diameter of the connecting cylinder 21. The assembly part 24 is arranged inside the connecting cylinder 21.

[0026] The connecting cylinder 21 is assembled in the second through hole 112, and its outer diameter is closely matched with the inner diameter of the second through hole 112. An assembly portion 24 is provided inside the connecting cylinder 21, and the assembly portion 24 can be designed into different structural forms according to actual use requirements, such as threaded holes, slots, etc., for assembly and connection with other components to realize the function of the foam aluminum composite structure in a specific application scenario.

[0027] The connecting plate body 22 is arranged on the outer wall of the connecting cylinder body 21 and extends in the horizontal direction, and its outer diameter is larger than the outer diameter of the connecting cylinder body 21. The connecting plate body 22 is assembled in the first through hole 111, and its outer edge is connected to the outer edge of the first through hole 111 by welding. This design increases the welding area, making the welding stronger, and the connecting plate body 22 can disperse the welding stress and improve the anti-deformation ability of the composite structure.

[0028] The plug plate 23 is arranged at the lower part of the connecting plate body 22 and is perpendicular to the connecting plate body 22. The plug plate 23 is located between the outer wall of the connecting cylinder 21 and the outer wall of the connecting plate body 22. The plug plate 23 in the aluminum alloy structural member is arranged at the lower part of the connecting plate body and is perpendicular to the connecting plate body, located between the outer wall of the connecting cylinder and the outer wall of the connecting plate body, and is arranged around the periphery of the connecting cylinder. The height dimension of the plug plate 23 is smaller than the height dimension of the connecting cylinder, and the cross-sectional shape along the vertical direction is a rectangle, and the ratio of the height dimension to the width dimension of the rectangle is in the range of 5-10. In addition, a plurality of heat conduction holes are arranged on the plug plate, and these heat conduction holes penetrate the plug plate and are arranged at intervals in the circumferential direction of the plug plate, and a sawtooth groove is also arranged at the bottom of the plug plate.

[0029] The plug plate 23 is arranged around the periphery of the connecting cylinder 21. The height dimension of the plug plate 23 is smaller than the height dimension of the connecting cylinder 21. The cross-sectional shape of the plug plate 23 along the vertical direction is a rectangle. The ratio of the height dimension to the width dimension of the rectangle is in the range of 5-10.

[0030] Specifically, the thermal conductivity of aluminum foam is low, and heat is easily accumulated during welding. The insert plate 23 with an aspect ratio of 5-10 can effectively utilize the high thermal conductivity of aluminum alloy, form an axially dominant heat flow path, reduce the influence of lateral heat diffusion on aluminum foam, and accelerate heat transfer. If the ratio is too small, the insert plate 23 is too wide, which is not conducive to limiting the molten pool and gas, and it is difficult to achieve precise alignment; if the ratio is too large, the insert plate 23 is too slender, the structural stability deteriorates, and it is easy to deform during assembly and welding, affecting the welding quality. Therefore, setting the ratio range to 5-10 can achieve a balance between heat conduction, structural stability and operability.

[0031] The heat conduction path is extended to make the welding heat diffuse more evenly along the preset direction, avoiding the formation of local hot spots. The long strip of plug board 23 can quickly conduct heat from the interface between the foam aluminum and the aluminum alloy part to the aluminum alloy part body or a wider area, reducing the peak temperature of the foam aluminum welding area and protecting its porous structure from thermal damage.

[0032] This aspect ratio helps limit the flow range of the molten metal, avoiding an overly large molten pool or uneven flow, thereby reducing the formation of pores and slag inclusions. At the same time, the close-fitting structure reduces the possibility of gas remaining in the molten pool during welding and reduces the chance of pores.

[0033] This shape design makes the fit between the plug plate 23 and the slot 113 more stable, ensures the precise alignment of the welding position, makes it easier to control the welding process parameters, reduces pores or slag inclusions caused by improper operation, and reduces the generation of impurities such as welding spatter and slag.

[0034] The insert plate 23 increases the contact area, so that the welding heat can be transferred to the foamed aluminum and the aluminum alloy part more evenly, avoiding welding defects caused by local overheating or insufficient heat.

[0035] Through the cooperation of the insert plate 23, the welding heat affected zone is limited to a smaller range, reducing the impurities generated by the foamed aluminum due to high-temperature oxidation or melting, thereby reducing the risk of slag inclusion.

[0036] The matching structure of the insert plate 23 can limit the flow range of the molten metal, avoid the molten pool being too large or the flow being uneven, thereby reducing the formation of pores and slag inclusions.

[0037] The close-fitting structure reduces the possibility of gas (such as air and impurities in the shielding gas) remaining in the molten pool during welding, reducing the generation of pores.

[0038] The plug board 23 is provided with heat conducting holes 231 , and a plurality of heat conducting holes 231 are provided through the plug board 23 and are spaced apart in the circumferential direction of the plug board 23 . A sawtooth groove 232 is provided at the bottom of the plug board 23 .

[0039] Due to the porous structure and low thermal conductivity of foam aluminum, heat is not easy to dissipate during welding, which is prone to local overheating and molten pool problems. The exhaust of gas and the stability of the molten pool during welding have a great influence on the welding quality.

[0040] The foam aluminum composite structure needs to have good connection strength and stability. The serrated groove 232 increases the contact area between the insert plate 23 and the foam aluminum, which can more efficiently transfer the welding heat from the interface to the foam aluminum, making the heat distribution more uniform, further avoiding local overheating, and better protecting the porous structure of the foam aluminum.

[0041] Furthermore, the serrated groove 232 can play a certain role in guiding the flow of molten metal, making the flow of molten metal more orderly, avoiding the problem of too large a molten pool or uneven flow, and helping to reduce the formation of pores and slag inclusions. During the welding process, the serrated groove 232 provides more exhaust channels for gas, reducing the possibility of gas remaining in the molten pool, thereby effectively reducing the generation of pores.

[0042] The arrangement of the serrated groove 232 can enhance heat conduction and optimize the molten pool to adapt to the characteristics of the foamed aluminum and ensure welding quality. The mechanical interlocking effect provided by the serrated groove 232 can complement the welding connection and further improve the overall performance of the structure.

[0043] The bottom of the plug board 23 is in direct contact with the bottom of the slot 113, and is also the area where heat and stress are most concentrated during welding. Setting the serrated groove 232 at this position can most directly improve the thermal conduction and mechanical connection performance of this area, and effectively solve the problems caused by heat accumulation and stress concentration during welding.

[0044] The sawtooth groove 232 at the bottom of the plug board 23 is relatively easy to process and will not have a significant impact on the overall structure and strength of the plug board 23. At the same time, during the assembly process, when the plug board 23 is inserted into the slot 113, the sawtooth groove 232 at the bottom can naturally match with the bottom of the slot 113, without the need for additional complex operations, which is convenient for production and manufacturing.

[0045] Because it is close to the welding interface, the sawtooth groove 232 can effectively and timely play its role in improving heat conduction, enhancing mechanical connection and reducing welding defects. During the welding process, the heat can be quickly conducted away from the interface, the stability of the connection is enhanced, and the generation of pores and slag inclusions is reduced, thereby improving the welding quality.

[0046] The sawtooth groove 232 arranged at the bottom of the insert plate 23 optimizes the welding performance without affecting the structure and function of other parts of the insert plate 23. The upper structure of the insert plate 23 can remain relatively intact and continue to play its role as a high thermal conductivity medium and positioning component, ensuring the performance and quality of the entire foam aluminum composite structure.

[0047] The provision of the serrated groove 232 increases the contact area between the plug plate 23 and the bottom of the slot 113. During the welding process, more heat can be transferred through the increased contact area, so that the heat can be conducted away from the welding area more quickly and evenly, avoiding excessive accumulation of heat at the interface between the foamed aluminum and the aluminum alloy, thereby reducing the occurrence of local overheating and protecting the porous structure of the foamed aluminum.

[0048] The serrated structure changes the path of heat conduction, allowing the heat to be transferred more dispersedly during the conduction process. The heat that may have been concentrated in a certain area is guided by the serrated grooves 232 and conducted along multiple branch paths, which helps the heat to be more evenly diffused to other parts of the aluminum alloy structural member, avoiding the formation of local hot spots and further improving the effect of heat conduction.

[0049] When the insert plate 23 is inserted into the slot 113, the sawtooth groove 232 forms a structure similar to a mortise and tenon joint with the bottom of the slot 113. After welding, this structure can increase the mechanical bite force between the insert plate 23 and the slot 113, making the connection between the foam aluminum body and the aluminum alloy structural member more stable. When subjected to external forces, it can better resist relative displacement, thereby improving the stability and reliability of the entire foam aluminum composite structure.

[0050] During the welding process and the use process after welding, the foam aluminum composite structure will be subjected to various stresses. The existence of the serrations 232 can disperse these stresses to multiple tooth grooves to avoid stress concentration at a certain point or a certain area, thereby reducing the risk of structural damage caused by stress concentration and extending the service life of the foam aluminum composite structure.

[0051] The connecting cylinder 21 is assembled in the second through hole 112 , the connecting plate 22 is assembled in the first through hole 111 , and the outer edge of the connecting plate 22 is welded to the outer edge of the first through hole 111 , and the plug plate 23 is matched with the slot 113 .

[0052] Due to its porous structure, the effective thermal conductivity of aluminum foam is significantly lower than that of dense aluminum alloy (usually only 1 / 10~1 / 5 of that of solid aluminum). Heat easily accumulates at the interface during welding, causing local overheating. Furthermore, during fusion welding (such as TIG and MIG), instantaneous high temperature (up to thousands of degrees Celsius) directly acts on the interface, and the porous structure of aluminum foam is difficult to dissipate heat quickly, causing the pore wall to melt or collapse.

[0053] The close fit between the insert plate 23 and the slot 113 ensures that the contact surface between the foam aluminum and the aluminum alloy part is more uniform and smooth, reducing the problem of uneven flow of molten metal caused by excessive gap or poor contact during welding.

[0054] The insert plate 23 (made of aluminum alloy) is used as a high thermal conductivity medium to quickly transfer the welding heat from the interface to the aluminum alloy body or a wider area, thereby preventing the heat from being retained in the foam aluminum. The peak temperature of the foam aluminum welding area is reduced, and its porous structure is protected from thermal damage.

[0055] The geometric shape of the plug board 23 (such as a long strip or a grid) is used to extend the heat conduction path, so that the heat is evenly diffused along a preset direction to avoid the formation of local hot spots.

[0056] The heat is conducted longitudinally through the solid aluminum alloy structure of the insert plate 23, forming an axially dominant heat flow path, thereby reducing the effect of lateral heat diffusion on the foamed aluminum.

[0057] The aluminum alloy insert plate 23 absorbs part of the instantaneous heat of welding, slows down the temperature rise rate, and reduces the thermal shock of the foam aluminum contact surface. The insert plate 23 is directly connected to the aluminum alloy body to form a low thermal resistance path, accelerating the heat transfer to the far end.

[0058] The cooperation between the insert plate 23 and the slot 113 ensures the precise alignment of the welding position, making it easier to control welding process parameters (such as current, voltage, welding speed, etc.), and reducing pores or slag inclusions caused by improper operation.

[0059] Precise alignment and stable welding process reduce the generation of impurities such as welding spatter and slag, thereby reducing the risk of slag inclusion. Tight fit reduces the chance of air entering the welding interface, reduces the generation of oxides during welding, and thus reduces the formation of pores.

[0060] The present embodiment also provides a method for preparing a foam aluminum composite structure, which is used to prepare the above-mentioned foam aluminum composite structure, and includes: assembling the connecting cylinder 21 into the second through hole 112, assembling the connecting plate body 22 into the first through hole 111, matching the plug plate 23 with the slot 113, and welding the outer edge of the connecting plate body 22 to the outer edge of the first through hole 111.

[0061] The insert plate 23 increases the contact area between the foam aluminum body and the aluminum alloy structural member, so that the welding heat can be transferred to the two more evenly. During the welding process, the heat can be more widely distributed through the insert plate 23, avoiding local overheating or insufficient heat, thereby reducing welding defects such as cracks caused by uneven heat.

[0062] The welding heat affected zone is limited to a smaller range by the cooperation of the insert plate 23. Since the insert plate 23 can quickly conduct heat away, the possibility of oxidation or melting of the foamed aluminum due to being in a high temperature state for a long time is reduced, the risk of impurities is reduced, and the probability of slag inclusion is reduced.

[0063] The geometric shape of the insert plate 23 (such as a long strip or a grid shape) is used to extend the heat conduction path, so that the heat is evenly diffused along the preset direction to avoid the formation of local hot spots. The heat is longitudinally conducted through the solid aluminum alloy structure of the insert plate 23 to form an axially dominant heat flow path, reducing the impact of lateral heat diffusion on the foamed aluminum.

[0064] The aluminum alloy insert plate 23 absorbs part of the instantaneous heat of welding, slows down the temperature rise rate, and reduces the thermal shock of the foam aluminum contact surface. The insert plate 23 is directly connected to the aluminum alloy body to form a low thermal resistance path, accelerate the heat transfer to the far end, and protect the porous structure of the foam aluminum from thermal damage.

[0065] The matching structure of the insert plate 23 and the slot 113 can limit the flow range of the molten metal to avoid the molten pool being too large or the flow being uneven. During welding, the molten metal is constrained in a certain area, which helps it to solidify evenly, thereby reducing the formation of pores and slag inclusions.

[0066] The tightly matched structure of the insert plate 23 and the slot 113 reduces the possibility of gas (such as impurities in air and shielding gas) remaining in the molten pool during welding, because the tightly matched structure reduces the passage of gas into the welding area and reduces the probability of pores.

[0067] The cooperation between the plug plate 23 and the slot 113 ensures the precise alignment of the welding position, making it easier to control welding process parameters (such as current, voltage, welding speed, etc.).

[0068] Precise alignment and stable welding process reduce the generation of impurities such as welding spatter and slag, thereby reducing the risk of slag inclusion, and also reduce the problem of porosity or slag inclusion caused by improper operation. Tight fit also reduces the chance of air entering the welding interface, reduces the generation of oxides during welding, and further reduces the formation of pores.

[0069] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0070] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0071] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A foam aluminum composite structure, characterized in that: It includes: A foamed aluminum body and an aluminum alloy structural member, wherein the foamed aluminum body is connected to the aluminum alloy structural member by welding, and an assembly portion is arranged on the aluminum alloy structural member; The foam aluminum body is provided with a connecting countersunk hole, the connecting countersunk hole includes a first through hole and a second through hole, the first through hole and the second through hole penetrate each other, the axis of the first through hole coincides with the axis of the second through hole, the first through hole is located above the second through hole, the inner diameter of the first through hole is larger than the inner diameter of the second through hole to form a step portion between the first through hole and the second through hole, the step portion is close to the top surface of the first through hole and a slot is provided, and the opening of the slot faces upward; The aluminum alloy structural member comprises a connecting cylinder, a connecting plate and a plug plate, wherein the connecting plate is arranged on the outer wall of the connecting cylinder and extends in the horizontal direction, the outer diameter of the connecting plate is larger than the outer diameter of the connecting cylinder, the assembly portion is arranged inside the connecting cylinder, and the plug plate is arranged at the lower part of the connecting plate and is perpendicular to the connecting plate; The connecting cylinder is assembled in the second through hole, the connecting plate is assembled in the first through hole, and the outer edge of the connecting plate is welded to the outer edge of the first through hole, and the plug plate is matched with the slot.

2. The foam aluminum composite structure according to claim 1, characterized in that: The slot is located between an inner wall of the first through hole and an inner wall of the second through hole.

3. The foam aluminum composite structure according to claim 2, characterized in that: The plug plate is located between the outer wall of the connecting cylinder and the outer wall of the connecting plate body.

4. The foam aluminum composite structure according to claim 3, characterized in that: The plug plate is arranged around the periphery of the connecting cylinder, and the cross-sectional shape of the plug plate along the vertical direction is a rectangle, and the ratio of the height dimension to the width dimension of the rectangle is in the range of 5-10.

5. The foam aluminum composite structure according to claim 3, characterized in that: The plug board is provided with heat conduction holes, a plurality of the heat conduction holes are arranged through the plug board and are arranged at intervals in the circumferential direction of the plug board, and a sawtooth groove is arranged at the bottom of the plug board.

6. The foam aluminum composite structure according to claim 5, characterized in that: The height dimension of the plug plate is smaller than the height dimension of the connecting cylinder.

7. A method for preparing a foamed aluminum composite structure, used for preparing the foamed aluminum composite structure according to any one of claims 1 to 6, characterized in that: Assemble the connecting cylinder into the second through hole, assemble the connecting plate into the first through hole, and match the plug plate with the slot; The outer edge of the connecting plate body is welded to the outer edge of the first through hole.

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