A method for preparing a layered metal composite plate with pulse current assistance

Abstract

This invention provides a method for preparing a pulsed current-assisted layered metal composite plate, including steps of material preparation, stacking, clamping, pulsed current heating, rolling, and annealing. In the material preparation step, at least two metal plates are selected. In both the clamping and annealing steps, the layered metal composite plate is clamped in the following manner: One energized clamp completely covers and clamps one end of the layered metal composite plate, while another energized clamp clamps the bottom layer of metal at the other end. This invention solves the problem in the prior art where full clamping of both ends of the layered metal composite plate restricts metal deformation during heating due to differences in the thermal deformation capabilities of the layered metals. It reduces the contact resistance between the layered metals, improves heating efficiency, and enhances the bonding strength of the composite plate.

Description

Technical Field

[0001] This invention relates to the field of layered metal composite material preparation technology, and in particular to a method for preparing layered metal composite plates assisted by pulsed current. Background Technology

[0002] Layered metal composites combine the properties of different metals, overcoming the shortcomings of single metal materials. For example, magnesium / aluminum alloy composites overcome the poor corrosion resistance and plasticity of magnesium alloys while achieving a lower density than aluminum alloys, making them promising lightweight materials for aerospace, shipbuilding, and automotive applications. Steel / aluminum composites, on the other hand, are layered composites with excellent electrical and thermal conductivity as well as good mechanical properties. Furthermore, composites of the same type but different grades of metals can achieve superior performance through interface element or interface structure design.

[0003] As can be seen from the above, the field of layered metal composite materials has huge development prospects and can create enormous industrial value. Hot rolling is one of the commonly used methods for preparing layered metal composite plates, which has the advantages of good product quality stability, simple process, high production efficiency, and ease of mass production. However, the traditional hot rolling method has disadvantages such as long heating time and limited furnace size in the pre-heating process. To address this, some existing technologies have introduced pulsed current assisted heating (for example, Chinese patent CN116900050A, a pulsed current assisted rolling forming method for Mg-Ta composite metal plates, and Chinese patent CN116532568A, a post-treatment method to improve the interfacial bonding performance of magnesium / aluminum composite plates). The principle is to use the Joule effect for rapid heating, which can heat to the specified temperature in a short time and is not limited by the size of the furnace.

[0004] However, during the electrothermal heating process described in the aforementioned patent, the different coefficients of thermal expansion between the metals result in variations in the deformation capacity of the metal plates. If the ends of the metal composite plate are directly clamped by an electrothermal clamp, some metal within the composite plate will warp, creating large gaps between layers, increasing contact resistance, affecting the heating rate, wasting resources, and potentially preventing the heating temperature from being reached, thus impacting the bonding performance of the composite plate. Furthermore, using a similar fully fixed method during the annealing of rolled metal composite plates can also reduce the bonding strength of the composite plate and even cause delamination. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pulsed current-assisted method for preparing layered metal composite plates. This method solves the problem in existing technologies where the layered metal composite plates are fully clamped at both ends, resulting in limited metal deformation during heating due to differences in the thermal deformation capabilities of the layered metals. It can reduce the contact resistance between the layered metals, improve heating efficiency, and enhance the bonding ability of the composite plate.

[0006] According to an embodiment of the present invention, a method for preparing a pulsed current assisted layered metal composite plate includes the steps of batching, stacking, clamping, pulsed current heating, rolling and annealing. In the batching step, at least two metal plates are selected. In the clamping and annealing steps, the layered metal composite plate is clamped in the following manner.

[0007] The specific method is as follows: one electrically powered clamp is used to completely cover and clamp one end of the layered metal composite plate, and another electrically powered clamp is used to clamp the bottom layer of the metal plate at the other end of the layered metal composite plate.

[0008] The technical principle of this invention is as follows: by changing the energized clamp to hold both ends of the layered metal composite plate, one end is used to clamp only the bottom metal plate. This ensures that the bottom metal can deform freely when heated, reducing the metal deformation limitation caused by the different deformation capabilities between the metal plates in the layered metal composite plate. Furthermore, under the tension of the energized clamp, the metal plate always remains flat, which can improve the bonding ability of the layered metal composite plate.

[0009] Furthermore, in the stacking step, the metal plate with the largest coefficient of thermal expansion is placed at the bottom layer of the layered metal composite plate.

[0010] By adopting the above technical solution, multiple metal plates are stacked in sequence, with the metal plate with the largest coefficient of thermal expansion placed at the bottom. Because it deforms the most when heated, the upper metal layers always adhere to the bottom metal layer under the action of gravity, which can reduce the contact resistance between the layered metals and increase the heating efficiency.

[0011] Furthermore, in the stacking step, one end of the bottom metal plate in the layered metal composite plate extends outward to form a clamping part that cooperates with the corresponding energized clamp.

[0012] By adopting the above technical solution, if the bottom metal plate is not the metal with the largest coefficient of thermal expansion, a certain size is reserved at one end of the bottom metal plate that is clamped separately, so that the metal with the larger coefficient of thermal expansion above can be heated and deformed freely, so that the metal above can still be attached to the metal below, thereby strengthening the bonding performance of the layered metal composite plate.

[0013] Furthermore, the clamping method of the energized chuck includes metal riveting or metal binding and fixing.

[0014] Furthermore, in the stacking step, the bottom two metal plates have different coefficients of thermal expansion.

[0015] Furthermore, the heating temperature in the pulsed current heating step is 340-400℃, and the heating time is 3-5 minutes.

[0016] Furthermore, the rolling step includes single-pass rolling or multi-pass rolling, with a total reduction of 38.5-40%.

[0017] Furthermore, the ingredient preparation step also includes polishing, which may include one or more combinations of an angle grinder, a grinding machine, or sandpaper.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Using pulsed current for heating avoids the limitation of furnace size on the heating of layered metal composite plates compared to traditional heating furnaces, and can reach the set temperature in a shorter time, which to some extent avoids the formation of metal compounds at the interface of the composite plate due to long heating time.

[0020] 2. Only the bottom metal plate of the layered metal composite plate is fully clamped at both ends, which reduces the limitation of metal deformation caused by different metal deformation capabilities during heating or rolling of the layered metal composite plate, and helps to improve the bonding ability of the layered metal composite plate. Attached Figure Description

[0021] Figure 1 This is a flowchart of a method for preparing a layered metal composite plate assisted by pulsed current according to the present invention;

[0022] Figure 2 This is a schematic diagram of the clamping method of the energized chuck in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the clamping method of the energized chuck in Embodiment 3 of the present invention;

[0024] Figure 4 This is a schematic diagram of the clamping method of the energized chuck in Comparative Example 1 of the present invention;

[0025] Figure 5 This is a schematic diagram of the clamping method of the energized chuck in Comparative Example 3 of the present invention;

[0026] Figure 6 This is a diagram showing the phenomenon of increased contact thermal resistance in the layered metal composite plate during heating in Comparative Example 2 of the present invention.

[0027] Figure 7 This is a diagram showing the phenomenon of the layered metal composite plate during heating in Embodiment 3 of the present invention. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0029] The method for preparing a pulsed current-assisted layered metal composite plate according to the embodiments of the present invention specifically includes the following steps:

[0030] (1) Ingredient preparation: Select at least two layered metal plates and polish and clean their surfaces to expose fresh metal.

[0031] (2) Stacking: Stack the layered metal plates after surface treatment, place the layered metal plate with the largest coefficient of thermal expansion at the bottom, and fix the overlapping end of each metal plate; or stack them without following the coefficient of thermal expansion, and reserve enough space at the outermost end of the bottom metal plate in advance so that the metal above can deform freely when heated.

[0032] (3) Clamping: Use an electric clamp to completely clamp one end of the layered metal plate, and then use another electric clamp to clamp the other end of the bottom layer of the layered metal plate.

[0033] (4) Pulse current heating: Pulse current is applied to heat the stacked and clamped layered metal composite plate, and the Joule effect is used to quickly heat it to the target temperature. The temperature of the layered metal composite plate is measured by thermocouple.

[0034] (5) Rolling: The heated layered metal composite plate is subjected to single-pass or multi-pass rolling, and the total reduction is measured.

[0035] (6) Annealing: The layered metal composite plate is clamped using the clamping method described in step (3) above, and then pulse current is applied again to raise the temperature for annealing.

[0036] Specifically, the technical solution of the present invention can be further understood in conjunction with the following embodiments:

[0037] Example 1

[0038] (1) Ingredients: Prepare AZ31b magnesium alloy plate with a thickness of 600mm*80mm*2mm and 6061 aluminum alloy plate with a thickness of 550mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0039] (2) Stacking: Stack the layered metal plates together in an aluminum / magnesium manner according to the coefficient of expansion, and rivet the overlapping ends together.

[0040] (3) Clamping: One end of the riveted layered metal plate is fully clamped using an electric clamp, while the other end is clamped only with an electric clamp to hold the bottom magnesium alloy (as shown in the attached document). Figure 2 (as shown);

[0041] (4) Pulse current heating: The stacked metal plates are heated by pulse current. When the temperature reaches 340℃, the power is stopped. The heating time is 3-4 minutes.

[0042] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%.

[0043] Example 2

[0044] (1) Ingredients: Prepare AZ31b magnesium alloy plate with a thickness of 600mm*80mm*2mm and 6061 aluminum alloy plate with a thickness of 550mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0045] (2) Stacking: Stack the layered metal plates together in the form of aluminum / magnesium according to the coefficient of expansion, and bind and fix the overlapping ends with iron wire;

[0046] (3) Clamping: One end of the layered metal plate is fully clamped using an electric clamp, while the other end is clamped only with an electric clamp to hold the bottom magnesium alloy (see attached). Figure 2 (The clamping method shown);

[0047] (4) Pulse current heating: The stacked metal plates are heated by pulse current. When the temperature reaches 340℃, the power is stopped. The heating time is 3-4 minutes.

[0048] (5) Rolling: The layered metal composite plate is rolled in two passes. The reduction in the first pass is 40%, and the total reduction is 52%.

[0049] Example 3

[0050] (1) Materials: Prepare AZ31b magnesium alloy sheet with a thickness of 400mm*80mm*2mm, 6061 aluminum alloy sheet with a thickness of 500mm*80mm*1mm and 6061 aluminum alloy sheet with a thickness of 600mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0051] (2) Stacking: Stack the layered metal plates together in the form of aluminum / magnesium / aluminum, place the 600mm*80mm*1mm 6061 aluminum alloy plate at the bottom, and rivet the overlapping ends of the plates together.

[0052] (3) Clamping: One end of the riveted layered metal plate is fully clamped using an electric clamp, while the other end is clamped only with an electric clamp to hold the bottom aluminum alloy (as shown in the attached document). Figure 3 (as shown);

[0053] (4) Pulse current heating: The stacked metal plates are heated by pulse current. When the temperature reaches 340℃, the power is stopped. The heating time is 3-4 minutes.

[0054] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%.

[0055] Example 4

[0056] (1) Materials: Prepare AZ31b magnesium alloy sheet with a thickness of 400mm*80mm*2mm, 6061 aluminum alloy sheet with a thickness of 500mm*80mm*1mm and 6061 aluminum alloy sheet with a thickness of 600mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0057] (2) Stacking: Stack the layered metal plates together in the form of aluminum / magnesium / aluminum, place the 600mm*80mm*1mm 6061 aluminum alloy plate at the bottom, and rivet the overlapping ends of the plates together.

[0058] (3) Clamping: One end of the riveted layered metal plate is fully clamped using an electrically powered chuck, while the other end is only clamped to hold the bottom aluminum alloy (see attached). Figure 3 (The clamping method shown);

[0059] (4) Pulse current heating: The stacked metal plates are heated by pulse current. When the temperature reaches 340°C, the power is stopped. The heating time is 3 minutes.

[0060] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%;

[0061] (6) Annealing: Repeat the clamping operation in step (3) above, continue to energize the rolled layered metal composite plate, heat it to 300°C and then perform annealing treatment, and hold it for 3 minutes.

[0062] Example 5

[0063] (1) Ingredients: Prepare AZ31b magnesium alloy plate with a thickness of 600mm*80mm*2mm and TC4 titanium alloy plate with a thickness of 550mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0064] (2) Stacking: According to the coefficient of expansion, the layered metal plates are stacked together in the form of titanium / magnesium, and the overlapping ends are riveted to fix them.

[0065] (3) Clamping: One end of the riveted layered metal plate is fully clamped using an electric clamp, while the other end is clamped only with an electric clamp to hold the bottom magnesium alloy (see attached). Figure 1 (The clamping method shown);

[0066] (4) Heating: Turn on the pulse current to heat the stacked and connected layered metal plates. Stop the power supply when the temperature reaches 400℃. The heating time is 3-4 minutes.

[0067] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 40%.

[0068] Comparative Example 1

[0069] (1) Ingredients: Prepare AZ31b magnesium alloy plate with a thickness of 600mm*80mm*2mm and 6061 aluminum alloy plate with a thickness of 600mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0070] (2) Stacking: Stack them together in an aluminum / magnesium manner according to their coefficient of thermal expansion, and rivet them together at the overlapping ends;

[0071] (3) Clamping: The two ends of the layered metal plate are fully clamped using electrically powered chucks (as shown in the attached diagram). Figure 4 (as shown);

[0072] (4) Pulse current heating: The stacked metal plates are heated by pulse current, and heating can not continue after reaching 310°C.

[0073] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%.

[0074] Comparative Example 2

[0075] (1) Ingredients: Prepare two pieces of AZ31b magnesium alloy plate (600mm*80mm*2mm) and 6061 aluminum alloy plate (600mm*80mm*1mm). Use an angle grinder or grinder to grind the metal surface to remove the oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0076] (2) Stacking: Stack them together in an aluminum / magnesium / aluminum manner and fix the overlapping ends;

[0077] (3) Clamping: The two ends of the layered metal plate are fully clamped using electrically powered chucks (see attached document). Figure 4 (The clamping method shown);

[0078] (4) Pulse current heating: The stacked metal plates are heated by pulse current, and heating can not continue after reaching 280°C.

[0079] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%.

[0080] Comparative Example 3

[0081] (1) Materials: Prepare AZ31b magnesium alloy sheet with a thickness of 400mm*80mm*2mm, 6061 aluminum alloy sheet with a thickness of 400mm*80mm*1mm and 6061 aluminum alloy sheet with a thickness of 450mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0082] (2) Stacking: Stack them together in an aluminum / magnesium / aluminum manner, place a 450mm*80mm*1mm 6061 aluminum alloy sheet at the bottom, and rivet the overlapping ends of the sheets together.

[0083] (3) Clamping: One end of the riveted layered metal plate is fully clamped using an electrically powered chuck, while the other end is only clamped to hold the bottommost aluminum alloy (as shown in the attached document). Figure 5 (as shown);

[0084] (4) Pulse current heating: The stacked metal plates are heated by pulse current. When the temperature reaches 340℃, the power is stopped. The heating time is 6-7 minutes.

[0085] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%.

[0086] Comparative Example 4

[0087] (1) Materials: Prepare AZ31b magnesium alloy sheet with a thickness of 400mm*80mm*2mm, 6061 aluminum alloy sheet with a thickness of 400mm*80mm*1mm and 6061 aluminum alloy sheet with a thickness of 600mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0088] (2) Stacking: Stack them together in an aluminum / magnesium / aluminum manner, place a 600mm*80mm*1mm 6061 aluminum alloy sheet at the bottom, and rivet and fix the overlapping ends of the sheets.

[0089] (3) Clamping: One end of the riveted layered metal plate is fully clamped using an electrically powered chuck, while the other end is only clamped to hold the bottommost aluminum alloy (see attached). Figure 5 (The clamping method shown);

[0090] (4) Pulse current heating: The stacked metal plates are heated by pulse current. The heating is stopped when the temperature reaches 340℃. The heating time is 3 minutes.

[0091] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 38.5%;

[0092] (6) Dimension processing of layered metal composite plate: The rolled layered metal composite plate is processed to make the whole into a cuboid, that is, the length dimensions between the layers of the layered metal composite plate are consistent.

[0093] (7) Annealing: The two ends of the layered metal composite plate are fully clamped using an electrically conductive clamp (see attached diagram for details). Figure 4 (The clamping method) is used to heat the material to 300℃ for annealing, and the holding time is 3 minutes.

[0094] Comparative Example 5

[0095] (1) Ingredients: Prepare AZ31b magnesium alloy plate with a thickness of 600mm*80mm*2mm and TC4 titanium alloy plate with a thickness of 600mm*80mm*1mm. Use an angle grinder or grinder to grind the metal surface to remove the surface oxide film and impurities, so that the fresh metal is exposed, which can improve the bonding quality of the composite material.

[0096] (2) Stacking: According to the coefficient of expansion, the layered metals are stacked together in the form of titanium / magnesium, and the overlapping ends are riveted to fix them.

[0097] (3) Clamping: The two ends of the layered metal plate are fully clamped using electrically powered chucks (see attached document). Figure 4 (The clamping method shown);

[0098] (4) Heating: Turn on the pulse current to heat the stacked and connected layered metal plates. Stop the power supply when the temperature reaches 400℃. The heating time is 4-5 minutes.

[0099] (5) Rolling: The layered metal composite plate is rolled in a single pass with a total reduction of 40%.

[0100] Table 1: Summary of shear strength, heating temperature, and heating time of layered metal composite plates in each embodiment and comparative example.

[0101]

[0102] It is known that the coefficient of thermal expansion of AZ31B magnesium alloy is greater than that of 6061 aluminum alloy.

[0103] In Examples 1 and 2, the magnesium metal layer is placed at the bottom of the layered metal composite plate. Its deformation is greater than that of the aluminum alloy. After pre-rolling heat treatment, it is rolled in single-pass and double-pass rolling respectively. The upper aluminum alloy is always attached to the lower magnesium alloy. There are no obvious gaps between the layers, the contact resistance is small, the heating rate is large, and the layered metal composite plate can be heated to 340°C quickly.

[0104] Reference Appendix Figure 6 The phenomenon diagram shows that, in Comparative Example 2, the two ends of the layered metal plate are fully clamped. Instead of placing the magnesium alloy with the largest coefficient of thermal expansion at the bottom, it is placed between the upper and lower aluminum alloys. Under short-term heating assisted by pulsed current, the deformation of the magnesium alloy is greater than that of the aluminum alloys on both sides, resulting in warping of different heights between the layers, large gaps between the layers, high contact resistance, and low heating efficiency. The layered metal composite plate cannot continue to heat up after being energized to 280°C.

[0105] In Example 3, the metal plates are not stacked in order of decreasing thermal expansion coefficients. However, an aluminum alloy plate with dimensions of 600mm*80mm*1mm is placed at the bottom. After being clamped by the power chuck, a space greater than 150mm is reserved for the deformation of the upper metal layers. When pulsed current is applied for auxiliary heating, both magnesium and aluminum alloys undergo thermal deformation. In particular, the deformation of the magnesium alloy in the middle layer is greater than that of the aluminum alloys on the top and bottom. The reserved space of the bottom aluminum alloy allows for unrestricted deformation. The upper aluminum and magnesium alloy layers adhere to the lower metal layers under gravity. The layered metal composite plate heats up rapidly with no significant stagnation, quickly reaching 340℃. This produces a layered metal composite plate with good bonding performance and a smooth surface. (Refer to Appendix) Figure 7 The phenomenon is illustrated in the diagram.

[0106] Neither Comparative Example 3 nor Example 3 stacked the metal plates according to their coefficient of thermal expansion. However, in Comparative Example 3, the aluminum alloy at the bottom layer was not large enough to allow for deformation of the upper metal after being clamped by the energized chuck. When heated, the magnesium alloy in the middle layer deformed more. After deformation reached the energized chuck, the deformation was hindered, and the magnesium alloy warped, leaving a large gap between it and the upper and lower aluminum alloy layers. Although its warping amplitude was less than that in Comparative Example 2, the layered metal composite plate could still be heated to 340°C, but the heating rate was slow, resulting in a waste of resources.

[0107] In Example 4 and Comparative Example 4, the rolled layered metal composite plates are in a connected state due to mechanical bonding. When annealing by electric heating, the interlayer metals are prone to uneven deformation due to the difference in thermal expansion coefficients. In Comparative Example 4, the layered metal composite plates are fully clamped at both ends during annealing, which restricts the thermal deformation of the metals and has a negative impact on the bonding performance of the layered metal composite plates. However, Example 4 does not use the method of fully clamping at both ends, so that the thermal expansion deformation of the interlayer metals in the layered metal composite plates is only restricted at one end, and the impact on the bonding performance is smaller.

[0108] It is known that the coefficient of thermal expansion of AZ31B magnesium alloy is greater than that of TC4 titanium alloy.

[0109] In Example 5, both ends of the layered metal composite plate are clamped according to the method provided by the present invention, that is, only the two ends of the magnesium alloy with a large coefficient of thermal expansion are fully clamped. In Comparative Example 5, both ends of the layered metal composite plate are fully clamped with energized clamps. In this case, when the magnesium alloy deforms to the position of the energized clamps due to heat, it will be restricted by the titanium alloy plate, causing the magnesium alloy to warp and slowing down the heating rate of the layered metal composite plate. This not only wastes resources, but also leads to a decrease in the bonding performance of the final layered metal composite plate due to prolonged heating.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a pulsed current-assisted layered metal composite plate, comprising the steps of batching, stacking, clamping, pulsed current heating, rolling, and annealing, wherein at least two metal plates are selected in the batching step, characterized in that, The clamping and annealing steps are performed by clamping the layered metal composite plate in the following manner; The specific method is as follows: one electrically powered clamp is used to completely cover and clamp one end of the layered metal composite plate, and another electrically powered clamp is used to clamp the bottom metal plate at the other end of the layered metal composite plate. In the stacking step, the metal plate with the largest coefficient of thermal expansion is placed at the bottom layer of the layered metal composite plate. In the stacking step, one end of the bottom metal plate in the layered metal composite plate extends outward to form a clamping part that cooperates with the corresponding power-conducting clamp.

2. The method for preparing a pulsed current-assisted layered metal composite plate according to claim 1, characterized in that, The clamping method of the energized clamp includes riveting metal parts or binding metal parts for fixation.

3. The method for preparing a pulsed current-assisted layered metal composite plate according to claim 1, characterized in that, In the stacking process, the bottom two metal plates have different coefficients of thermal expansion.

4. The method of claim 1, wherein the method further comprises: The heating temperature in the pulsed current heating step is 340-400℃, and the heating time is 3-5 minutes.

5. The method of claim 1, wherein the method further comprises: The rolling process includes single-pass rolling or multi-pass rolling, with a total reduction of 38.5-40%.

6. The method of claim 1, wherein the method further comprises: The ingredient preparation step also includes polishing, which may include one or more combinations of an angle grinder, a grinding machine, or sandpaper.

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