CN113054508A - Cable terminal crimping method - Google Patents
Cable terminal crimping method Download PDFInfo
- Publication number
- CN113054508A CN113054508A CN202110268772.3A CN202110268772A CN113054508A CN 113054508 A CN113054508 A CN 113054508A CN 202110268772 A CN202110268772 A CN 202110268772A CN 113054508 A CN113054508 A CN 113054508A
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- Prior art keywords
- terminal
- copper
- aluminum
- conductor
- crimping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002788 crimping Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004020 conductor Substances 0.000 claims abstract description 63
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 51
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052802 copper Inorganic materials 0.000 claims abstract description 34
- 239000010949 copper Substances 0.000 claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910000838 Al alloy Inorganic materials 0.000 claims description 28
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 23
- 238000007906 compression Methods 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 abstract description 15
- 229910000765 intermetallic Inorganic materials 0.000 abstract description 5
- 238000000137 annealing Methods 0.000 description 29
- -1 aluminum silver Chemical compound 0.000 description 11
- YCKOAAUKSGOOJH-UHFFFAOYSA-N copper silver Chemical compound [Cu].[Ag].[Ag] YCKOAAUKSGOOJH-UHFFFAOYSA-N 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 8
- 229910044991 metal oxide Inorganic materials 0.000 description 8
- 150000004706 metal oxides Chemical class 0.000 description 8
- 229910052709 silver Inorganic materials 0.000 description 8
- 239000004332 silver Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000007747 plating Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000007907 direct compression Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
- H01R43/042—Hand tools for crimping
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Abstract
The invention relates to a cable terminal crimping method, and belongs to the technical field of cable terminal connection. And (3) padding a layer of silver foil between the terminal and the wire, namely between copper and aluminum, namely performing preforming on the cable conductor, then covering the crimping part with the silver foil, connecting the conductor and the terminal, and then crimping, and finally realizing the connection between the cable conductor and the terminal. The method can effectively solve the problems of resistance rise, terminal crimping relaxation and the like caused by intermetallic compounds formed on the copper-aluminum interface after the terminal is crimped. The process is simple and reliable, the cost is low, and the copper-aluminum crimping terminal can be widely applied to the copper-aluminum crimping terminal.
Description
Technical Field
The invention relates to a cable terminal crimping method, and belongs to the technical field of cable terminal connection.
Background
At present, a cable crimping terminal is an accessory product for connecting a cable part and terminal equipment, and is used for various electric control distribution equipment, complete equipment, a multi-loop electric meter box and a combined terminal electric appliance box to play a role in wiring. The crimping terminal has firm and reliable wiring and flexible and convenient use. However, the copper-aluminum contact is easy to generate intermetallic compounds, which have high resistivity, high hardness and high brittleness, so that the copper-aluminum compression joint is easy to cause overheating and compression joint relaxation of compression joint parts, thereby affecting the electrical performance and the service life of the compression joint terminal.
In the prior patent CN109797412A "a method for improving interface of copper-aluminum composite material by silver plating", a method for improving interface of copper-aluminum composite material by silver plating is disclosed, but the method is limited by silver plating process, for example, 1, the silver plating process on material surface is complex; 2. silver plating is heavy pollution, and the requirement on environmental protection is high; 3. the thickness and uniformity of the silver coating are limited by the surface shape of the sample; 4. it is expensive and therefore not suitable for a cable-like crimping terminal.
In view of the above-mentioned drawbacks, the present invention is to provide a method for crimping a cable terminal, which has industrial application value.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method for crimping a terminal of a cable, so as to solve the problems of resistance increase, terminal crimping relaxation, etc. caused by formation of intermetallic compounds on a copper-aluminum interface after the terminal is crimped.
The invention relates to a cable terminal crimping method, which comprises the following concrete crimping steps:
pre-forming a cable conductor, then coating a crimping part with silver foil, connecting the conductor and a terminal, and then crimping to finally realize the connection between the cable conductor and the terminal;
the ratio of the thickness of the silver foil to the diameter of the conductor is 1: 60-1: 100.
Further, the ratio of the thickness of the silver foil to the diameter of the conductor is 1: 80.
Furthermore, the thickness of the silver foil is 0.05-0.10 mm.
Further, the purity of the silver foil is not lower than 99.9%.
Furthermore, the terminal and the conductor are copper and aluminum, that is, the terminal is copper, the conductor is aluminum, or the terminal is aluminum and the conductor is copper.
Further, the aluminum comprises pure aluminum and aluminum alloy, and the copper comprises pure copper and copper alloy.
Further, the conductor preforming is formed by performing pre-compression joint according to the aperture of the terminal.
Furthermore, the conductor and the terminal are connected and then are crimped, and whether the silver foil at the crimping groove is damaged or not does not influence the crimping quality.
By the scheme, the invention at least has the following advantages:
the invention adopts the method of padding silver foil between the terminal and the conductor, and can effectively solve the problems of resistance rise, terminal crimping relaxation and the like caused by intermetallic compounds formed on the copper-aluminum interface after the terminal is crimped. And the process is simple and reliable, the cost is low (silver foil is cheap due to high ductility), and the method can be widely applied to the crimping terminal.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides a method for crimping a cable terminal, which is to pad a layer of silver foil between the terminal and a lead, namely between copper and aluminum. The terminal and the conductor are respectively copper and aluminum, namely the terminal is copper and the conductor is aluminum or the terminal is aluminum and the conductor is copper. The aluminum comprises pure aluminum and aluminum alloy, the copper comprises pure copper and copper alloy, the thickness of the silver foil is 0.05-0.1 mm, and the purity of the silver foil is not lower than 99.9%. And performing the cable conductor, then covering the crimping part with silver foil, connecting the conductor and the terminal, and then crimping, and finally realizing the connection between the cable conductor and the terminal. The conductor preforming means that the diameter of the conductor is pre-pressed and formed according to the hole diameter of the terminal.
Example 1
The embodiment provides a cable terminal crimping method, which comprises the following steps: the aluminum alloy conductor with the diameter of 10mm is subjected to circular pre-pressing and tight connection, a layer of silver foil with the thickness of 0.1mm is coated, then the copper alloy terminal with the aperture of 12mm is inserted for connection, and then the copper alloy terminal and the copper alloy terminal are subjected to compression joint, and finally the connection of the terminal and the cable is completed. The connection is annealed at 450 ℃ in vacuum for 2h, the accelerated intermetallic diffusion is simulated, the contact resistance is detected by using a contact resistance tester (milliohm meter), the detection shows that the contact resistance between the terminal and the aluminum conductor is 2.63m omega, and the contact resistance is reduced to 2.54m omega after annealing, so that the conclusion can be drawn that the contact resistance is reduced after annealing because the copper silver and the aluminum silver are contacted more fully in the annealing process, the resistance is reduced, and no metal oxide layer is generated when the copper silver and the aluminum silver are contacted.
Example 2
The embodiment provides a cable terminal crimping method, which comprises the following steps: the copper alloy conductor with the diameter of 6mm is pre-pressed and tightly connected in a circular mode, a layer of silver foil with the thickness of 0.07mm is coated on the copper alloy conductor, then the copper alloy conductor and the aluminum alloy conductor are inserted into an aluminum alloy terminal with the aperture of 8mm to be connected, then the copper alloy conductor and the aluminum alloy terminal are pressed and connected, and finally the connection of the terminal and the cable is completed. The connection is annealed at 450 ℃ in vacuum for 2h, the accelerated intermetallic diffusion is simulated, the contact resistance is detected by using a contact resistance tester (milliohm meter), the detection shows that the contact resistance of the aluminum alloy terminal and the copper conductor is 2.60m omega, and the contact resistance is reduced to 2.51m omega after annealing, so that the conclusion can be drawn that the contact resistance is reduced after annealing because the copper silver and the aluminum silver are contacted more fully in the annealing process, the resistance is reduced, no metal oxide layer is generated during the contact of the copper silver and the aluminum silver, and meanwhile, the exchange of the copper aluminum materials of the lead and the terminal does not influence the performance of the contact resistance.
Example 3
The embodiment provides a cable terminal crimping method, which comprises the following steps: the copper alloy conductor with the diameter of 4mm is pre-pressed and tightly connected in a circular mode, a layer of silver foil with the thickness of 0.05mm is coated on the copper alloy conductor, then the copper alloy conductor and the aluminum alloy terminal with the aperture of 6mm are inserted into the silver foil to be connected, then the copper alloy conductor and the aluminum alloy terminal are pressed and connected, and finally the connection of the terminal and the cable is completed. The connection is annealed at 450 ℃ in vacuum for 2h, the accelerated intermetallic diffusion is simulated, the contact resistance is detected by using a contact resistance tester (milliohm meter), the detection shows that the contact resistance of the aluminum alloy terminal and the copper conductor is 2.54m omega, and the contact resistance is reduced to 2.47m omega after annealing, so that the conclusion can be inferred that the contact resistance is reduced after annealing because the copper silver and the aluminum silver are contacted more fully in the annealing process, so the resistance is reduced, no metal oxide layer is generated when the copper silver and the aluminum silver are contacted, and meanwhile, the exchange of the copper aluminum materials of the lead and the terminal does not influence the performance of the contact resistance.
Example 4
The embodiment provides a cable terminal crimping method, which comprises the following steps: the copper alloy conductor with the diameter of 3mm is pre-pressed and tightly connected in a circular mode, a layer of silver foil with the thickness of 0.05mm is coated on the copper alloy conductor, then the copper alloy conductor and the aluminum alloy terminal with the aperture of 5mm are inserted into the silver foil to be connected, then the copper alloy conductor and the aluminum alloy terminal are pressed and connected, and finally the connection of the terminal and the cable is completed. The connection is annealed at 450 ℃ in vacuum for 2h, the accelerated intermetallic diffusion is simulated, the contact resistance is detected by using a contact resistance tester (milliohm meter), the detection shows that the contact resistance of the aluminum alloy terminal and the copper conductor is 2.58m omega, and the contact resistance is reduced to 2.49m omega after annealing, so that the conclusion can be drawn that the contact resistance is reduced after annealing because the copper silver and the aluminum silver are contacted more fully in the annealing process, the resistance is reduced, no metal oxide layer is generated during the contact of the copper silver and the aluminum silver, and meanwhile, the exchange of the copper aluminum materials of the lead and the terminal does not influence the performance of the contact resistance. Comparing the experimental data of examples 1-4, wherein the ratio of the silver foil thickness to the wire diameter in examples 1-4 ranges from 1:60 to 1:100, and the ratio of the silver foil thickness to the wire diameter in this embodiment is 1:80, the performance in all embodiments is the best, and the applicant speculates that there is an optimal ratio between the silver foil thickness and the wire diameter, and in this ratio, the silver foil acts as a conductive buffer layer, so as to maximally prevent the generation of metal oxide between copper and aluminum materials and the electrical conductivity.
Example 5
The embodiment provides a cable terminal crimping method, which comprises the following steps: the method comprises the steps of performing circular pre-pressing and tight connection on a copper alloy conductor with the diameter of 3mm, coating a layer of silver foil with the thickness of 0.06mm, inserting an aluminum alloy terminal with the aperture of 5mm for connection, and performing compression joint on the aluminum alloy terminal and the aluminum alloy terminal to finally complete connection between the terminal and a cable. The connection is annealed in vacuum at 450 ℃ for 2h to simulate and accelerate intermetallic diffusion, a contact resistance tester (milliohm meter) is used for detecting the contact resistance, the detection shows that the contact resistance of the aluminum alloy terminal and the copper conductor is 2.69m omega, the contact resistance after annealing is reduced to 2.60m omega, therefore, the contact resistance after annealing is reduced because the copper, the silver and the aluminum are contacted more fully in the annealing process, the resistance is reduced, a metal oxide layer is not generated when the copper and the aluminum are contacted, meanwhile, the exchange of the copper and the aluminum materials of the lead and the terminal does not influence the performance of the contact resistance, but because the ratio of the thickness of the silver foil layer to the diameter of the conductor is lower than 1:60, the final contact resistance and the contact resistance after annealing are obviously reduced, and the applicant conjectures that because the silver foil layer is too thin relative to the diameter of the conductor, the structural stability of the buffer layer during compression joint is poor, the expected buffer connection effect is not achieved.
Example 6
The embodiment provides a cable terminal crimping method, which comprises the following steps: the method comprises the steps of performing circular pre-pressing and tight connection on a copper alloy conductor with the diameter of 3mm, coating a layer of silver foil with the thickness of 0.025mm, inserting an aluminum alloy terminal with the aperture of 5mm for connection, and performing compression joint on the aluminum alloy terminal and the aluminum alloy terminal to finally complete connection between the terminal and a cable. The connection is annealed at 450 ℃ in vacuum for 2h, the accelerated intermetallic diffusion is simulated, the contact resistance is detected by using a contact resistance tester (milliohm meter), the detection shows that the contact resistance between the aluminum alloy terminal and the copper conductor is 2.72m omega, and the contact resistance is reduced to 2.63m omega after annealing, so that the fact that the contact resistance is reduced after annealing can be inferred because the copper silver and the aluminum silver are contacted more fully in the annealing process, so that the resistance is reduced, a metal oxide layer is not generated when the copper silver and the aluminum silver are contacted, and meanwhile, the exchange of the copper aluminum materials of the lead and the terminal does not influence the performance of the contact resistance. However, since the ratio between the thickness of the silver foil layer and the diameter of the conductor is higher than 1:100, the final contact resistance and the contact resistance after annealing are also significantly reduced, and the applicant speculates that the silver foil layer is too thick, which finally results in poor bonding conformance of the buffer layer at the joint, and thus the contact resistance cannot reach the expected value.
Example 7
The embodiment provides a cable terminal crimping method, which comprises the following steps: the method comprises the steps of performing circular pre-pressing and tight connection on a copper alloy conductor with the diameter of 3mm, coating a layer of silver foil with the thickness of 0.05mm and the purity of 99.0%, inserting an aluminum alloy terminal with the aperture of 5mm for connection, and performing compression joint on the aluminum alloy terminal and the aluminum alloy terminal to finally complete connection between the terminal and a cable. The joint is annealed in vacuum at 450 ℃ for 2h to simulate and accelerate intermetallic diffusion, a contact resistance tester (milliohm meter) is used for detecting the contact resistance, the detection shows that the contact resistance of the aluminum alloy terminal and the copper conductor is 2.63m omega, the contact resistance is reduced to 2.55m omega after annealing, it is concluded that the reduction in contact resistance after annealing is due to the fact that the copper silver and aluminum silver are in more complete contact during annealing, and therefore the resistance is reduced, no metal oxide layer is generated when the copper-aluminum material of the lead and the terminal is contacted with the copper-aluminum material of the terminal, and the performance of contact resistance is not influenced, but compared with the example 4, since the purity of the silver foil used is less than 99.9%, the final contact resistance by pressure welding and the contact resistance after annealing are both reduced, and the applicant speculates that the higher the purity of the silver foil, the higher the conductivity of the silver foil, and thus the contact conductivity of copper and aluminum coated with the silver foil can be improved.
Comparative example 1
The invention provides a cable terminal crimping method, which comprises the following steps: and (3) inserting an aluminum alloy conductor with the diameter of 10mm into a copper alloy terminal with the aperture of 12mm for connection, and then crimping the aluminum alloy conductor and the copper alloy terminal to complete the connection of the terminal and the cable. Vacuum annealing at 450 deg.C for 2h, detecting contact resistance with contact resistance tester (milliohm meter), the contact resistance of the terminal and aluminum conductor after crimping is 2.48m omega, and the contact resistance after annealing is increased to 2.79 omega. The initial contact resistance of the copper terminal without the silver foil coating and the aluminum conductor after compression joint is better than that of the copper foil coating mode due to the fact that the two materials are in direct compression joint contact, but along with the increase of the use time, namely the diffusion phenomenon of copper and aluminum in the long-term use process simulated in the annealing process, the contact resistance after final annealing is not reduced but obviously increased because the copper and the aluminum are diffused in the annealing process to produce a metal part compound with higher resistance, so that the contact resistance is increased, and the invention examples 1-4 are verified from the side, through aluminum foil coating, because pure silver has good conductivity, the copper and the aluminum have extremely low solubility at normal temperature and cannot diffuse with each other, and the method of carrying out interface isolation on copper and aluminum between terminals by adopting the silver foil can avoid the resistance increase caused by the formation of intermetallic compounds on the copper and aluminum interface after the terminal is compression joint, The problem of terminal crimping relaxation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A cable terminal crimping method is characterized by comprising the following concrete crimping steps:
pre-forming a cable conductor, then coating a crimping part with silver foil, connecting the conductor and a terminal, and then crimping to finally realize the connection between the cable conductor and the terminal;
the ratio of the thickness of the silver foil to the diameter of the conductor is 1: 60-1: 100.
2. A cable terminal crimping method according to claim 1, characterized in that: the ratio of the thickness of the silver foil to the diameter of the conductor is 1: 80.
3. A cable terminal crimping method according to claim 1, characterized in that: the thickness of the silver foil is 0.05-0.10 mm.
4. A cable terminal crimping method according to claim 1, characterized in that: the purity of the silver foil is not lower than 99.9%.
5. A cable terminal crimping method according to claim 1, characterized in that: the terminal and the conductor are copper and aluminum, namely the terminal is copper and the conductor is aluminum or the terminal is aluminum and the conductor is copper.
6. The cable terminal crimping method according to claim 5, characterized in that: the aluminum comprises pure aluminum and aluminum alloy, and the copper comprises pure copper and copper alloy.
7. A cable terminal crimping method according to claim 1, characterized in that: the conductor preforming is formed by performing pre-compression joint according to the aperture of the terminal.
8. A cable terminal crimping method according to claim 1, characterized in that: after the conductor and the terminal are connected, the crimping quality is not affected by whether the silver foil at the crimping groove is damaged or not.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110268772.3A CN113054508A (en) | 2021-03-12 | 2021-03-12 | Cable terminal crimping method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110268772.3A CN113054508A (en) | 2021-03-12 | 2021-03-12 | Cable terminal crimping method |
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| Publication Number | Publication Date |
|---|---|
| CN113054508A true CN113054508A (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110268772.3A Pending CN113054508A (en) | 2021-03-12 | 2021-03-12 | Cable terminal crimping method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201732870U (en) * | 2010-05-14 | 2011-02-02 | 安徽钛钴新金属有限公司 | Copper-aluminum transition connection terminal adopting compression joint |
| US9674950B1 (en) * | 2013-12-09 | 2017-06-06 | Flextronics Ap, Llc | Methods of stitching components on fabrics using metal foils |
| CN107004962A (en) * | 2014-10-03 | 2017-08-01 | 通用线缆技术公司 | Wire and the method for preparing wire to receive contact element |
| CN107123866A (en) * | 2017-06-05 | 2017-09-01 | 吉林省中赢高科技有限公司 | A kind of joint and its plasma welding method of copper tip and aluminum conductor |
| CN109797412A (en) * | 2017-11-17 | 2019-05-24 | 北京有色金属研究总院 | A method of utilizing silver-plated improvement copper aluminum composite material interface |
-
2021
- 2021-03-12 CN CN202110268772.3A patent/CN113054508A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201732870U (en) * | 2010-05-14 | 2011-02-02 | 安徽钛钴新金属有限公司 | Copper-aluminum transition connection terminal adopting compression joint |
| US9674950B1 (en) * | 2013-12-09 | 2017-06-06 | Flextronics Ap, Llc | Methods of stitching components on fabrics using metal foils |
| CN107004962A (en) * | 2014-10-03 | 2017-08-01 | 通用线缆技术公司 | Wire and the method for preparing wire to receive contact element |
| CN107123866A (en) * | 2017-06-05 | 2017-09-01 | 吉林省中赢高科技有限公司 | A kind of joint and its plasma welding method of copper tip and aluminum conductor |
| CN109797412A (en) * | 2017-11-17 | 2019-05-24 | 北京有色金属研究总院 | A method of utilizing silver-plated improvement copper aluminum composite material interface |
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Application publication date: 20210629 |
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