Copper-aluminum composite plate current-carrying capacity test sample

Abstract

The utility model discloses a copper-aluminum composite plate current-carrying capacity test sample, which comprises a copper plate and an aluminum plate, the top surface of one end of the copper plate and the bottom surface of one end part of the aluminum plate are correspondingly crimped and are equal in width, and one end, far away from the aluminum plate, of the copper plate is connected with a first soft copper stranded wire through a first wire clamp drainage plate; the end, away from the copper plate, of the aluminum plate is connected with a second soft copper stranded wire through a second wire clamp drainage plate, the end, away from the copper plate, of the first soft copper stranded wire is connected with a large-current testing device, the large-current testing device is connected with the second soft copper stranded wire, the thickness of the copper plate is 5-8 mm, and the thickness of the aluminum plate is set to be twice that of the copper plate. The area of a composite area of the copper plate and the aluminum plate is equal to the vertical sectional area of the aluminum plate, current is loaded through a large-current test device and is conducted to the copper-aluminum composite plate through the soft copper stranded wire and the wire clamp drainage plate, so that the temperature of the sample is increased at a certain speed, the current value is gradually increased, and the temperature rise change of a copper material, an aluminum material and a copper-aluminum interface is detected by a temperature measurement sensor; and the copper-aluminum composite transition joint fails and is disconnected.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical performance testing, and more specifically, to a copper-aluminum composite plate current carrying capacity testing sample. Background Art

[0002] In recent years, copper-aluminum composite panels have been widely used in heat exchange fields such as LED packaging, high-current rails, rail transit plates, and the power industry due to their excellent electrical and thermal conductivity.

[0003] The copper-aluminum composite plate is used as a transition joint in the transition connection between the copper plate and the aluminum busbar in the graphitization furnace. The total current of the resistance furnace equipment is 340000A, the ambient temperature is usually less than 200℃, and its limit temperature is 300℃. Therefore, it is urgent to test the temperature rise change of the copper-aluminum composite transition joint, and test its maximum current carrying capacity and the maximum current density. However, the existing current carrying capacity test specimens are not able to meet the current carrying capacity test of the metal composite plate.

[0004] Therefore, in order to solve the above problems, a copper-aluminum composite plate current carrying capacity test sample is proposed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to propose a copper-aluminum composite plate current-carrying capacity test specimen, which is arranged by setting a copper plate and an aluminum plate that are explosively welded together, and connected to a large current test device through a wire clamp drain plate and a soft copper stranded wire, and by detecting the temperature rise changes at the copper plate, the aluminum plate and the composite area until the crimping point between the copper plate and the aluminum plate is disconnected, so as to test the maximum current carrying capacity and the maximum current density.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A copper-aluminum composite plate current carrying capacity test specimen, comprising a long strip copper plate and an aluminum plate of equal width, the top surface of one end of the copper plate is correspondingly crimped with the bottom surface of one end of the aluminum plate, and on the same horizontal line, the end of the copper plate away from the aluminum plate is connected to a first soft copper stranded wire through a first wire clamp drainage plate, the end of the aluminum plate away from the copper plate is connected to a second soft copper stranded wire through a second wire clamp drainage plate, the end of the first soft copper stranded wire away from the copper plate is connected to a large current test device, and the large current test device is connected to the end of the second soft copper stranded wire away from the aluminum plate, and the large current test device is connected to a power supply;

[0008] The thickness of the copper plate is 5-8 mm, the thickness of the aluminum plate is correspondingly set to be twice that of the copper plate, and the composite area of ​​the copper plate and the aluminum plate is equal to the vertical cross-sectional area of ​​the aluminum plate;

[0009] The copper plate and the aluminum plate are crimped by explosion welding.

[0010] The utility model is further configured as follows: the length and width of the composite area of ​​the copper plate and the aluminum plate are 12 mm and 10 mm respectively, the length and width of the vertical section of the aluminum plate are 12 mm and 10 mm respectively, and the length and width of the vertical section of the copper plate are 10 mm and 6 mm respectively.

[0011] The utility model is further configured as follows: the length of the copper plate and the aluminum plate after crimping in the horizontal direction is 1000 mm.

[0012] In summary, the utility model has the following beneficial effects:

[0013] By setting the thickness of the copper plate to 5-8 mm, the thickness of the aluminum plate is twice that of the copper plate. Since the current density of copper is twice that of aluminum, the thickness of the aluminum plate is twice that of the copper plate on the premise that the width of the copper plate and the aluminum plate are equal, which can ensure that the current carrying capacity of each area of ​​the sample is uniform.

[0014] By making the area of ​​the composite region equal to the vertical cross-sectional area of ​​the aluminum plate, it can ensure that the current carrying capacity of each area of ​​the sample is uniform under the same current, and the maximum current carrying capacity and the maximum current density of the composite interface can be measured more accurately;

[0015] By setting the crimping method of the copper plate and the aluminum plate to explosive welding, the shear strength at the composite interface can be made greater than or equal to the lower shear strength of the two metal materials, and the explosive composite interface is tightly bonded, has no gaps, and does not exhibit interface corrosion, thereby enabling welding between dissimilar metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the connection structure between the copper plate and the aluminum plate;

[0017] Figure 2 It is a schematic diagram of the circuit arrangement of the utility model.

[0018] Figure numerals: 1. copper plate; 2. aluminum plate; 3. composite area; 4. first wire clamp and drain plate; 5. first soft copper stranded wire; 6. high current test device; 7. second soft copper stranded wire; 8. second wire clamp and drain plate. DETAILED DESCRIPTION

[0019] The utility model is described in detail below in conjunction with the accompanying drawings.

[0020] Embodiment: A copper-aluminum composite plate current carrying capacity test specimen is provided, which is formed by setting a copper plate and an aluminum plate that are explosively welded together, and connected to a large current test device through a wire clamp drain plate and a soft copper stranded wire. By detecting the temperature rise changes at the copper plate, the aluminum plate and the composite area until the crimping point between the copper plate and the aluminum plate is disconnected, the maximum current carrying capacity and the maximum current density can be tested.

[0021] refer to Figure 1 , Figure 2 , including a long copper plate 1 and an aluminum plate 2 of equal width, the top surface of one end of the copper plate 1 is crimped correspondingly to the bottom surface of one end of the aluminum plate 2, and on the same horizontal line, the end of the copper plate 1 away from the aluminum plate 2 is connected to the first soft copper stranded wire 5 through the first wire clamp drainage plate 4, the end of the aluminum plate 2 away from the copper plate 1 is connected to the second soft copper stranded wire 7 through the second wire clamp drainage plate 8, the end of the first soft copper stranded wire 5 away from the copper plate 1 is connected to a large current test device 6, and the large current test device 6 is connected to the end of the second soft copper stranded wire 7 away from the aluminum plate 2, the large current test device 6 is powered on, the thickness of the copper plate 1 is 5~8mm, because the current density of copper material is twice that of aluminum material, so on the premise that the width of the copper plate 1 and the aluminum plate 2 are equal, the thickness of the aluminum plate 2 is made to be twice that of the copper plate 1, so as to ensure that the current carrying capacity of each area of ​​the sample is uniform. The area of ​​the composite region 3 of the copper plate 1 and the aluminum plate 2 is equal to the vertical cross-sectional area of ​​the aluminum plate 2, and the crimping method of the copper plate 1 and the aluminum plate 2 is explosion welding. Specifically, the length and width of the composite region 3 of the copper plate 1 and the aluminum plate 2 are 12mm and 10mm respectively, the length and width of the vertical cross-section of the aluminum plate 2 are 12mm and 10mm respectively, and the length and width of the vertical cross-section of the copper plate 1 are 10mm and 6mm respectively. The horizontal length of the copper plate 1 and the aluminum plate 2 after crimping is 1000mm. Making the area of ​​the composite region 3 equal to the vertical cross-sectional area of ​​the aluminum plate 2 can ensure that the current carrying capacity of each area of ​​the sample is uniform under the same current, and more accurately measure the maximum current carrying capacity and the maximum current density of the composite interface.

[0022] The copper plate 1 and the aluminum plate 2 are crimped by explosion welding. The advantages of explosive welding are high bonding strength, the shear strength at the composite interface is greater than or equal to the lower shear strength of the two metal materials, and the explosive composite interface is tightly bonded without gaps, and no interface corrosion occurs, which can achieve welding between heterogeneous metals.

[0023] A sawing machine is used to cut a rectangular blank with a length of 1000 mm and a width of 10 mm at one end of the leveled copper-aluminum composite plate. Secondly, the base material or composite material at both ends of the blank is milled off by machining, and a part of the composite area 3 is retained in the middle. Then, the current carrying capacity test circuit is arranged, and the large current test device 6 is connected. Three temperature measuring points are selected on the copper plate 1, the aluminum plate 2 and the composite area 3 respectively, and the temperature measuring sensor is connected. The current is loaded through the large current test device 6. The current is conducted to the copper-aluminum composite plate through the soft copper stranded wire and the wire clamp drainage plate, so that the sample heats up at a certain speed, and the current value of the large current test device 6 is gradually increased. The temperature rise changes at the copper plate 1, the aluminum plate 2 and the composite area 3 are detected until the crimping point of the copper plate 1 and the aluminum plate 2 is disconnected, and then the maximum current carrying capacity and the maximum current density are tested, and the temperature of the copper-aluminum composite plate sample and the test current are recorded; the test is repeated three times, and the average value is taken as the final experimental data.

[0024] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A copper-aluminum composite plate current carrying capacity test sample, characterized in that: It comprises a long strip copper plate and an aluminum plate of equal width, the top surface of one end of the copper plate is correspondingly crimped with the bottom surface of one end of the aluminum plate, and they are on the same horizontal line, the end of the copper plate away from the aluminum plate is connected to the first soft copper stranded wire through the first wire clamp drainage plate, the end of the aluminum plate away from the copper plate is connected to the second soft copper stranded wire through the second wire clamp drainage plate, the end of the first soft copper stranded wire away from the copper plate is connected to a high current test device, and the high current test device is connected to the end of the second soft copper stranded wire away from the aluminum plate, and the high current test device is connected to the power supply; The thickness of the copper plate is 5-8 mm, the thickness of the aluminum plate is correspondingly set to be twice that of the copper plate, and the composite area of ​​the copper plate and the aluminum plate is equal to the vertical cross-sectional area of ​​the aluminum plate; The copper plate and the aluminum plate are crimped by explosion welding.

2. The copper-aluminum composite plate current carrying capacity test sample according to claim 1, characterized in that: The length and width of the composite area of ​​the copper plate and the aluminum plate are 12 mm and 10 mm respectively, the length and width of the vertical section of the aluminum plate are 12 mm and 10 mm respectively, and the length and width of the vertical section of the copper plate are 10 mm and 6 mm respectively.

3. The copper-aluminum composite plate current carrying capacity test sample according to claim 1, characterized in that: The length of the copper plate and the aluminum plate after crimping in the horizontal direction is 1000 mm.

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