CN111151836B - Connection method and application of high-temperature superconducting tape - Google Patents
Connection method and application of high-temperature superconducting tape Download PDFInfo
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- CN111151836B CN111151836B CN202010030373.9A CN202010030373A CN111151836B CN 111151836 B CN111151836 B CN 111151836B CN 202010030373 A CN202010030373 A CN 202010030373A CN 111151836 B CN111151836 B CN 111151836B
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- temperature superconducting
- filler metal
- brazing filler
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/06—Soldering, e.g. brazing, or unsoldering making use of vibrations, e.g. supersonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
Abstract
The invention discloses a connecting method and application of a high-temperature superconducting tape, wherein the connecting method comprises the following steps: cleaning the parts to be connected of the high-temperature superconducting strips; then, activating the high-temperature superconducting tape by using a surfactant; heating and pressurizing a high-temperature superconducting tape/brazing filler metal/high-temperature superconducting tape three-layer structure made of a high-temperature superconducting tape and brazing filler metal by using an ultrasonic welding device, and carrying out ultrasonic vibration on the three-layer structure after the brazing filler metal is melted; stopping heating after the ultrasonic vibration and heating act for 8-12 s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is completely solidified, so that the connection of the two sections of high-temperature superconducting strips is completed; by utilizing the connecting method, the super-long high-temperature superconducting tape for the magnet can be obtained by repeated connection. According to the method for connecting the high-temperature superconducting strips, the welding area is fully paved with the molten brazing filler metal in a mode of heating and applying ultrasonic waves at the same time, and the reliability of the welding joint of the high-temperature superconducting strips is effectively improved.
Description
Technical Field
The invention relates to the technical field of ultrasonic welding of superconducting tapes, in particular to a connecting method and application of a high-temperature superconducting tape.
Background
The high-temperature superconducting strip is well known for low resistance and high current-carrying capacity, can be widely applied to the fields of ship power, power transmission and the like, and is mainly applied in the form of winding the high-temperature superconducting strip into a magnet. Meanwhile, due to the limitation of the length of the high-temperature superconducting tape, the lapping phenomenon is inevitable, the performance of the joint of the high-temperature superconducting tape has a large influence on the performance of the superconducting magnet, and if the strength, the resistance and other performances of the joint are insufficient, the joint is likely to become a weak link of the whole superconducting magnet, and the low-temperature stable operation of the magnet is seriously influenced.
At present, the connection mode of the high-temperature superconducting tapes is mainly two modes of manual welding and mechanical welding, wherein the manual welding mainly comprises the steps of adding brazing filler metal between the superposed high-temperature superconducting tapes, superposing and heating the brazing filler metal, and applying certain pressure to enable the internal welding flux to be uniformly spread in a welding area so as to finish welding. Mechanical welding is implemented by changing heating and pressing into a mechanical mode, and the basic principle is similar to manual welding. The connection mode has the problems that the temperature is difficult to accurately position during welding, and if the temperature is too low, the brazing filler metal is not sufficiently melted, so that insufficient welding can be caused, air holes are formed in the brazing filler metal, the welding resistance is increased, and the joint strength is not high; the performance of the superconducting wire can be degraded when the temperature is too high, and particularly, the second-generation layered high-temperature superconducting tape can also have a delamination phenomenon to cause serious degradation of the performance of the tape.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for connecting high temperature superconducting tapes and an application thereof, in which a welding method of applying ultrasonic waves while heating is used to improve the overall performance of a welded joint of high temperature superconducting tapes, thereby effectively improving the reliability of the welded joint of high temperature superconducting tapes, and providing technical support for the application of high temperature superconducting tapes in the field of magnets.
The technical scheme adopted by the invention to solve the technical problems is as follows: a method of joining high temperature superconducting tapes, the joining method comprising the steps of:
removing oxide skin on the surface of the part to be connected of the high-temperature superconducting strip to be connected by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface;
secondly, activating the part to be connected of the high-temperature superconducting tape treated in the first step by using a surfactant;
thirdly, placing one of the high-temperature superconducting tapes subjected to the activation treatment in the second step on a constant-temperature heating platform of an ultrasonic welding device, then placing brazing filler metal on a part to be connected of the high-temperature superconducting tape, and then placing the part to be connected of the other high-temperature superconducting tape subjected to the activation treatment in the second step above the brazing filler metal to form a three-layer structure of the high-temperature superconducting tapes/the brazing filler metal/the high-temperature superconducting tapes;
step four, heating and pressurizing the three-layer structure manufactured in the step three by using an ultrasonic welding device, and applying pressure perpendicular to the extending direction of the high-temperature superconducting tape to the three-layer structure during pressurization so as to enable the three-layer structure to be tightly attached; after the brazing filler metal melts, carrying out ultrasonic vibration on the three-layer structure; stopping heating after the ultrasonic vibration and heating act for 8-12 s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is completely solidified, so that the connection of the two sections of high-temperature superconducting strips is completed;
further, in the second step, the surfactant is a weakly acidic organic series active agent based on lactic acid or citric acid.
Furthermore, in the third step, the solder is one of tin-lead solder or low-temperature indium-based solder.
Further, in the fourth step, the heating temperature is 160-230 ℃, and the pressurizing pressure is 0.2-0.5 MPa.
Furthermore, in the fourth step, the vibration frequency of the ultrasonic vibration is 30-60 Hz, and the amplitude is 2-4 μm.
Further, the high-temperature superconducting tape is a first-generation and/or second-generation high-temperature superconducting tape.
The high-temperature superconducting strip connected by the connecting method is applied to the field of wound magnets.
Has the advantages that:
as described above, the method for connecting high temperature superconducting tapes and the application thereof according to the present invention have the following advantages:
1. according to the method for connecting the high-temperature superconducting tapes, the welding area is fully paved with the molten brazing filler metal in a mode of heating and applying ultrasonic waves at the same time, so that the reliability of the welding joint of the high-temperature superconducting tapes is effectively improved, meanwhile, the method can properly reduce the welding temperature, prevent the high-temperature superconducting tapes from being quenched due to over-temperature, and improve the comprehensive performance of the welding joint of the high-temperature superconducting tapes.
2. The surfactant used in the invention mainly plays a role in quickly removing oxides on the surfaces of the brazing filler metal and the base metal, so that the metal surface reaches necessary cleanliness, the surface is prevented from being oxidized again during welding, the surface tension of the brazing filler metal is reduced, and the welding performance is improved.
3. The connection method provided by the invention has good effect on the connection of the first-generation high-temperature superconducting tape and/or the second-generation high-temperature superconducting tape, the resistance of the welding joint can be reduced by more than 20%, and the welding success rate of the welding joint is improved by more than 30%.
The present invention will be described in further detail with reference to the drawings and specific examples.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of ultrasonic brazing.
The ultrasonic vibration testing device comprises a graphic mark 1, a constant temperature heating platform 2, a pressure head 3 and an ultrasonic vibrator.
Detailed Description
A method for connecting high-temperature superconducting strips and an application thereof are disclosed, wherein the high-temperature superconducting strips are connected on an ultrasonic welding device, as shown in figure 1, the ultrasonic welding device comprises a constant-temperature heating platform 1 for heating, a pressure head 2 for pressurizing positioned above the constant-temperature heating platform, and an ultrasonic vibrator 3 for ultrasonic vibration positioned inside the pressure head 2.
A method for joining high temperature superconducting tapes comprises the steps of:
removing oxide skin on the surface of a part to be connected of the high-temperature superconducting strip to be connected by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface of the part to be connected of the high-temperature superconducting strip;
secondly, activating the surface of a part to be connected of the high-temperature superconducting tape by using a surfactant to promote the contact of the brazing filler metal and the high-temperature superconducting tape, wherein the surfactant is a weak-acid organic series active agent based on lactic acid or citric acid;
and step three, placing one of the high-temperature superconducting strips activated in the step two on a constant-temperature heating platform of an ultrasonic welding device, then placing a brazing filler metal on the part to be connected of the high-temperature superconducting strip, and placing the part to be connected of the other high-temperature superconducting strip activated in the step two above the brazing filler metal to form a three-layer structure of the high-temperature superconducting strip/the brazing filler metal/the high-temperature superconducting strip, wherein the brazing filler metal is one of tin-lead soft solder or low-temperature indium-based soft solder.
Step four, respectively heating and pressurizing the three-layer structure manufactured in the step three by using a constant-temperature heating platform 1 and a pressure head 2 of the ultrasonic welding device, wherein the pressure head 2 applies pressure perpendicular to the extending direction of the high-temperature superconducting strip to the three-layer structure during pressurization so as to enable the three-layer structure to be tightly attached; after the brazing filler metal is melted, carrying out ultrasonic vibration on the three-layer structure by using an ultrasonic vibrator 3; stopping heating after the ultrasonic vibration and heating act for 8-12 s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is completely solidified, so that the connection of the two sections of high-temperature superconducting strips is completed; the three-layer structure is a welded joint after welding, the heating temperature is 160-230 ℃, the pressurizing pressure is 0.2-0.5 MPa, the vibration frequency is 30-60 Hz, and the amplitude is 2-4 mu m.
It should be noted that the high temperature superconducting tapes to be connected may be two short sections of high temperature superconducting tapes, or may be two long sections of high temperature superconducting tapes that have been connected.
The shape of the brazing material is not limited, and may be a welding wire or a welding ribbon. And the high-temperature superconducting tape may be a first-generation and/or second-generation high-temperature superconducting tape.
The high-temperature superconducting tapes connected by the method are applied to the field of wound magnets, namely, a plurality of sections of high-temperature superconducting tapes are connected according to the connection method, and the ultra-long high-temperature superconducting tapes for the wound magnets can be obtained.
Example 1:
a method for joining high temperature superconducting tapes comprises the steps of: removing oxide skin on the surface of the part to be connected of the high-temperature superconducting strip by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface of the part to be connected of the high-temperature superconducting strip; and then activating the surface of the part to be connected of the first generation of BSCCO high-temperature superconducting strip by using a surfactant to promote the contact of the brazing filler metal and the high-temperature superconducting strip, assembling the first generation of BSCCO high-temperature superconducting strip and the SnPb brazing filler metal into a BSCCO high-temperature superconducting strip/SnPb welding strip/BSCCO high-temperature superconducting strip three-layer structure, placing the three-layer structure on a constant-temperature heating platform 1, and heating and pressurizing the three-layer structure by using an ultrasonic welding device at the heating temperature of 210 ℃ and under the pressure of 0.3 MPa. When the brazing filler metal is melted, ultrasonic vibration is started, the vibration frequency is 60Hz, and the amplitude is 4 mu m. Stopping heating after the vibration heating simultaneously acts for 10s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is solidified, namely completing the connection of the two sections of high-temperature superconducting strips; and repeating the steps to sequentially connect the multiple sections of high-temperature superconducting tapes to obtain the ultralong high-temperature superconducting tape for the magnet.
Example 2:
a method for joining high temperature superconducting tapes comprises the steps of: removing oxide skin on the surface of the part to be connected of the high-temperature superconducting strip by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface of the part to be connected of the high-temperature superconducting strip; and then activating the surface of the part to be connected of the first generation of BSCCO high-temperature superconducting tapes by using a surfactant to promote the contact of the brazing filler metal and the superconducting tapes, assembling the first generation of BSCCO high-temperature superconducting tapes and the InAg brazing filler metal into a BSCCO high-temperature superconducting tape/InAg welding tape/BSCCO high-temperature superconducting tape three-layer structure, placing the three-layer structure on a constant-temperature heating platform, and heating and pressurizing the three-layer structure by using an ultrasonic welding device at the heating temperature of 170 ℃ and under the pressure of 0.3 MPa. When the brazing filler metal is melted, ultrasonic vibration is started, the vibration frequency is 40Hz, and the amplitude is 4 mu m. Stopping heating after the vibration heating simultaneously acts for 10s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is solidified, namely completing the connection of the two sections of high-temperature superconducting strips; and repeating the steps to sequentially connect the multiple sections of high-temperature superconducting tapes to obtain the ultralong high-temperature superconducting tape for the magnet.
Example 3:
a method for joining high temperature superconducting tapes comprises the steps of: removing oxide skin on the surface of the part to be connected of the high-temperature superconducting strip by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface of the part to be connected of the high-temperature superconducting strip; and then activating the surface of the part to be connected of the second-generation layered YBCO high-temperature superconducting tape by using a surfactant to promote the contact of the SnPb brazing filler metal and the second-generation layered YBCO high-temperature superconducting tape, assembling the second-generation layered YBCO high-temperature superconducting tape and the SnPb brazing filler metal into a three-layer structure of a YBCO high-temperature superconducting tape/a SnPb welding strip/a YBCO high-temperature superconducting tape, placing the three-layer structure on a constant-temperature heating platform, and then heating and pressurizing the three-layer structure by using an ultrasonic welding device at the heating temperature of 210 ℃ and under the pressure of 0.2 MPa. Starting ultrasonic vibration after the brazing filler metal is melted, wherein the vibration frequency is 30Hz, the amplitude is 2 mu m, the heating is stopped after the vibration heating simultaneously acts for 10s, and the pressurization and the ultrasonic vibration are stopped after the brazing filler metal is solidified, so that the connection of welding two sections of high-temperature superconducting strips is completed; and repeating the steps to sequentially connect the multiple sections of high-temperature superconducting tapes to obtain the ultralong high-temperature superconducting tape for the magnet.
Example 4:
a method for joining high temperature superconducting tapes comprises the steps of: removing oxide skin on the surface of the part to be connected of the high-temperature superconducting strip by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface of the high-temperature superconducting strip; and then activating the surface of the part to be connected of the second-generation layered YBCO high-temperature superconducting tape by using a surfactant to promote the contact of the brazing filler metal and the high-temperature superconducting tape, forming a three-layer structure of a YBCO high-temperature superconducting tape/an InAg welding tape/a YBCO high-temperature superconducting tape by using the second-generation layered YBCO high-temperature superconducting tape and InAg brazing filler metal, placing the three-layer structure on a constant-temperature heating platform, and heating and pressurizing the three-layer structure by using an ultrasonic welding device at the heating temperature of 170 ℃ and under the pressure of 0.2 MPa. When the brazing filler metal is melted, ultrasonic vibration is started, the vibration frequency is 30Hz, and the amplitude is 2 mu m. Stopping heating after the vibration heating simultaneously acts for 10s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is solidified, namely completing the connection of the two sections of high-temperature superconducting strips; and repeating the steps to sequentially connect the multiple sections of high-temperature superconducting tapes to obtain the ultralong high-temperature superconducting tape for the magnet.
The invention adopts the ultrasonic welding device with the heating function, on one hand, the brazing filler metal is melted at a proper temperature, and on the other hand, the molten brazing filler metal can be fully paved on a welding area by ultrasonic waves. The welding method has the advantages that the welding temperature can be properly reduced, the high-temperature superconducting strip can be prevented from being over-heated, meanwhile, the welding area can be fully filled with the brazing filler metal through ultrasonic waves, and therefore the strength and the resistance of the joint are improved. Through detecting the welding joints and the welding quality of the high-temperature superconducting tapes of the embodiments 1 to 4, the resistance of the welding joints of the joints adopting the connection method provided by the invention can be reduced by more than 20%, and the welding success rate of the welding joints is improved by more than 30%. And the joints of the high-temperature superconducting tapes in examples 3 to 4 were free from delamination.
According to the method for connecting the high-temperature superconducting tapes, the comprehensive performance of the welding joint of the high-temperature superconducting tapes is improved in a mode of heating and applying ultrasonic waves at the same time, the reliability of the welding joint of the high-temperature superconducting tapes is effectively improved, and technical support is provided for the application of the high-temperature superconducting tapes in the field of magnets.
The method for connecting high temperature superconducting tapes and the application thereof provided by the present invention are described in detail above, and the principle and the specific implementation of the present invention are illustrated herein by using specific examples, which are only used to help understand the method and the core idea of the present invention. It should be noted that any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are within the protective scope of the present invention to those skilled in the art.
Claims (5)
1. A method for joining high temperature superconducting tapes, comprising the steps of:
removing oxide skin on the surface of the part to be connected of the high-temperature superconducting strip by using abrasive paper, and wiping the surface of the part to be connected of the high-temperature superconducting strip by using acetone to clean the surface of the part to be connected of the high-temperature superconducting strip;
secondly, activating the part to be connected of the high-temperature superconducting tape treated in the first step by using a surfactant;
thirdly, placing one of the high-temperature superconducting tapes subjected to the activation treatment in the second step on a constant-temperature heating platform of an ultrasonic welding device, then placing brazing filler metal on a part to be connected of the high-temperature superconducting tape, and then placing the part to be connected of the other high-temperature superconducting tape subjected to the activation treatment in the second step above the brazing filler metal to form a three-layer structure of the high-temperature superconducting tapes/the brazing filler metal/the high-temperature superconducting tapes;
step four, heating and pressurizing the three-layer structure manufactured in the step three by using an ultrasonic welding device, wherein the heating temperature is 160-230 ℃, the pressurizing pressure is 0.2-0.5 Mpa, and the pressure perpendicular to the extending direction of the high-temperature superconducting strip is applied to the three-layer structure during pressurizing so as to enable the three-layer structure to be tightly attached; after the brazing filler metal melts, carrying out ultrasonic vibration on the three-layer structure; stopping heating after the ultrasonic vibration and heating act for 8-12 s, and stopping pressurizing and ultrasonic vibration after the brazing filler metal is completely solidified, so that the connection of the two sections of high-temperature superconducting strips is completed;
wherein the solder is one of tin-lead solder or low-temperature indium-based solder.
2. A method for joining high temperature superconducting tapes according to claim 1, wherein in the second step, the surfactant is a weakly acidic organic series active agent based on lactic acid or citric acid.
3. A method for joining high-temperature superconducting tapes according to claim 1, wherein the three-layer structure is ultrasonically vibrated in the fourth step at a vibration frequency of 30 to 60Hz and an amplitude of 2 to 4 μm.
4. A method for joining high temperature superconducting tapes according to claim 1, wherein the high temperature superconducting tapes are first-generation and/or second-generation high temperature superconducting tapes.
5. Use of the high temperature superconducting tapes joined by the joining method according to claim 1 in the field of wound magnets.
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| CN112103743B (en) * | 2020-08-10 | 2021-05-14 | 华南理工大学 | Method for improving terminal connection mode of superconducting cable |
| CN115383237A (en) * | 2022-10-11 | 2022-11-25 | 中天集团上海超导技术有限公司 | Welding device and welding method |
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