CN110661152A - Welding method, welding device and welding joint for high-temperature superconductor - Google Patents
Welding method, welding device and welding joint for high-temperature superconductor Download PDFInfo
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- CN110661152A CN110661152A CN201910817441.3A CN201910817441A CN110661152A CN 110661152 A CN110661152 A CN 110661152A CN 201910817441 A CN201910817441 A CN 201910817441A CN 110661152 A CN110661152 A CN 110661152A
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- 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
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
- H01R43/0263—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections for positioning or holding parts during soldering or welding process
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- 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
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
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- 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
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
- H01R43/0235—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections for applying solder
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Abstract
The application relates to a welding method, a welding device and a welding joint of a high-temperature superconductor. According to the welding method of the high-temperature superconductor, the overlapping area of two strip-shaped high-temperature superconductors to be welded is polished, an oxide layer on the surface of metal is removed, and the polished overlapping area is cleaned. And welding the overlapping areas together through welding materials to form a welding joint, wherein the overlapping length of the welding joint is 60mm-80 mm. When the overlapping length of the welding joint is more than 60mm, the reduction of the welding resistance is not obvious any more, so that the overlapping length of the welding joint is 60mm to 80mm, and not only can the smaller overlapping resistance be ensured, but also the mechanical property of the strip can be ensured.
Description
Technical Field
The present invention relates to the technical field of superconducting cables, and in particular, to a welding method, a welding device, and a welding joint for a high-temperature superconductor.
Background
The high-temperature superconducting cable has the advantages of low line loss, large transmission capacity, small occupied space of a corridor, environmental friendliness and the like, and provides an efficient, compact, reliable and green electric energy transmission mode for a power grid. Due to the low-voltage and high-current characteristics of the superconducting cable, the superconducting cable has the advantages of reducing the voltage level of a power grid and simplifying the potential of a power grid framework, and has important significance for long-term development and planning of the power grid.
The practical high-temperature superconductors mainly comprise a first-generation high-temperature superconductor and a second-generation high-temperature superconductor. The first generation of high temperature superconductors is represented by bismuth strontium calcium copper oxide (Bi-Sr-Ca-Cu-O) superconducting tapes. The second generation high temperature superconductor is represented by yttrium barium copper oxide (Y-Ba-Cu-O) conduction band. Whether first generation or second generation, individual, endless strips are typically on the order of hundreds of meters in length due to limitations in current process technology and the like. Because of the limited single-tape length of the superconducting tapes, tape-like high-temperature superconductors of cable length are required to be formed by soldering a plurality of superconducting tapes. Non-superconducting welds between superconducting tapes introduce so-called joint resistance, which affects the conductivity properties of the high temperature superconductor.
Disclosure of Invention
In view of the above, it is necessary to provide a welding method, a welding apparatus, and a welded joint for a high-temperature superconductor, which are directed to the problem of how to reduce the resistance of the joint.
A method of soldering a high temperature superconductor, comprising:
s10, providing two strip-shaped high-temperature superconductors, and respectively polishing the two strip-shaped high-temperature superconductors to remove a metal oxide layer on the surface of each strip-shaped high-temperature superconductor to form a lap joint area;
s20, respectively cleaning the lap joint areas of the two strip-shaped high-temperature superconductors, and drying the cleaned lap joint areas;
s30, welding the lap joint areas of the two ribbon-shaped high-temperature superconductors together by using solder to form a welding joint;
wherein, two overlap joint district is direct just setting up, welded joint's overlap joint length is 60mm to 80 mm.
In one embodiment, the solder has a thickness of 0.01mm to 0.1 mm.
In one embodiment, the solder is one of a tin solder or a nano silver solder.
In one embodiment, the step S30 of soldering the bonding regions of the two ribbon high temperature superconductors together with solder to form a solder joint comprises:
coating the lap joint area of the strip-shaped high-temperature superconductor by using nano silver solder, and standing for preset time;
overlapping the overlapping areas of the two high-temperature strip superconductors, and controlling the overlapping length to be 60-80 mm;
and placing the two overlapped ribbon high-temperature superconductors into a welding fixture positioning groove with preset temperature and preset forward pressure, and performing pressure welding for preset time to form the welding joint.
In one embodiment, the preset temperature is 100 ℃ to 200 ℃, the preset forward pressure is 0.3MPa to 1MPa, and the preset time is 1min to 5 min.
In one embodiment, the step S30 of soldering the bonding regions of the two ribbon high temperature superconductors together with solder to form a solder joint comprises:
overlapping the overlapping areas of the two high-temperature strip superconductors, and controlling the overlapping length to be 60-80 mm;
providing tin solder, and placing the tin solder between the lap joint areas of the two high-temperature strip superconductors (100);
and heating the tin solder until the tin solder is melted, and welding the lap joint areas together through the solder to form the welding joint.
In one embodiment, the heating temperature is 180 ℃ to 220 ℃.
A welded joint of high temperature superconductors, wherein two strip-shaped high temperature superconductors are welded into the welded joint by the welding method in any one of the above embodiments, and the overlapping length of the welded joint is 60mm to 80 mm.
In one embodiment, the joint resistance of the weld joint is less than 20n Ω.
A welding apparatus for a high temperature superconductor, comprising:
the strip clamp comprises an overlap length control element, wherein the overlap length control element is used for controlling the overlap length of a welding joint to be 60-80 mm; and
and the induction heating component is arranged on the strip clamp and used for providing heat for the strip clamp.
In one embodiment, the lap length control element is a graduated receiving groove.
According to the welding method of the high-temperature superconductor, the overlapping area of two strip-shaped high-temperature superconductors to be welded is polished, an oxide layer on the surface of metal is removed, and the polished overlapping area is cleaned. And welding the overlapping areas together through welding materials to form a welding joint, wherein the overlapping length of the welding joint is 60mm-80 mm. When the overlapping length of the welding joint is more than 60mm, the reduction of the welding resistance is not obvious any more, so that the overlapping length of the welding joint is 60mm to 80mm, and not only can the smaller overlapping resistance be ensured, but also the mechanical property of the strip can be ensured.
Drawings
FIG. 1 is a flow chart of a method for welding a high temperature superconductor according to one embodiment of the present application;
FIG. 2 is a diagram illustrating a solder joint structure of a high temperature superconductor according to one embodiment of the present application;
fig. 3 is a block diagram of a soldering apparatus for a high temperature superconductor according to an embodiment of the present application.
Description of the main element reference numerals
Welded joint 10
Tape-shaped high-temperature superconductor 100
Lap length control element 210
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, in one embodiment, a method for soldering a high temperature superconductor is provided. The welding method comprises the following steps:
s10, providing two high temperature strip superconductors 100, and respectively polishing the two high temperature strip superconductors 100 to remove the metal oxide layer on the surface of each high temperature strip superconductor 100, thereby forming a lap joint region. The high temperature superconductor tape 100 may be a yttrium-based high temperature superconducting tape (77K, self field) encapsulated in stainless steel and having a width of 15mm to 30 mm. The surface of the stainless steel cladding layer of the belt material close to the superconducting layer can be polished by sand paper to remove the oxide layer on the metal surface.
S20, respectively cleaning the lap joint regions of the two ribbon-shaped high-temperature superconductors 100, and drying the cleaned lap joint regions. The lap joint area can be cleaned by alcohol or clear water. Acetone can be selected for drying the lap joint areas after cleaning.
S30, the lap joint regions of the two ribbon-shaped high-temperature superconductors 100 are soldered together by using solder to form the solder joint 10. The solder may be a tin solder. The solder may also be a nanosilver solder. In an alternative embodiment, the solder has a thickness of 0.01mm to 0.1 mm. Wherein, two overlap joint district is direct just to setting up, the overlap joint length of welded joint 10 is 60mm to 80 mm. In an alternative embodiment, the overlap length of the weld joint 10 is 70 mm.
In this embodiment, the oxide layer on the metal surface is removed by polishing the lap joint region of two ribbon-shaped high-temperature superconductors to be welded, and the polished lap joint region is cleaned. And welding the overlapping areas together through welding materials to form a welding joint, wherein the overlapping length of the welding joint is 60mm-80 mm. When the overlapping length of the welding joint is more than 60mm, the reduction of the welding resistance is not obvious any more, so that the overlapping length of the welding joint is 60mm to 80mm, and not only can the smaller overlapping resistance be ensured, but also the mechanical property of the strip can be ensured.
In one embodiment, the step S30 of soldering the bonding regions of the two ribbon high temperature superconductors 100 together by using solder to form the solder joint 10 includes:
the lap zone of one of the tape-shaped high temperature superconductors 100 is coated with nano silver solder and left for a while. The lap joint region of the two ribbon-shaped high-temperature superconductors 100 is overlapped, and the lap joint length is controlled to be 60mm to 80 mm. And placing the two overlapped ribbon-shaped high-temperature superconductors 100 into a positioning groove of a welding fixture with preset temperature and preset forward pressure, and performing pressure welding for preset time to form the welding joint 10. In an alternative embodiment, the preset temperature is 100 ℃ to 200 ℃, the preset forward pressure is 0.3MPa to 1MPa, and the preset time is 1min to 5 min.
In this embodiment, the preparation method of the nano silver may be: 1L of 10g/L sodium citrate solution and 3.75L deionized water are stirred, mixed uniformly and heated to 80 ℃. 85mL of a silver nitrate aqueous solution having a concentration of 10g/L was added to the above mixed solution. And then, quickly adding 100mL of 1g/L sodium borohydride solution into the reaction system, violently stirring at 80 ℃ for 1.5h, and gradually cooling to room temperature to obtain the 5 nm-particle monodisperse nano-silver colloid dispersion liquid. The monodisperse nano silver colloid dispersion liquid with the particle size of 5nm is prepared into the monodisperse nano silver ethanol dispersion liquid with the concentration of 0.8kg/L and the particle size of 5nm through high-speed centrifugal separation and ultrasonic dispersion in absolute ethanol. It will be appreciated that various parameters for preparing the nano-silver solder may vary depending on the parameters of the desired nano-silver solder.
The prepared ethanol dispersion of monodisperse nano silver can be rapidly applied to the lap joint region of the treated tape-shaped high-temperature superconductor 100. After repeated coating for many times, after ethanol is volatilized, the lap joint areas of the two banded high-temperature superconductors 100 are attached together, the materials are placed in a positioning groove of a welding fixture with the temperature of 100 ℃ and the forward pressure of 0.1MPa, pressure welding is kept for 2min, and finally welding of the low-resistance yttrium high-temperature superconductor based on the nano silver solder is completed to form a welding joint.
In one embodiment, the step S30 of soldering the bonding regions of the two ribbon high temperature superconductors 100 together by using solder to form the solder joint 10 includes:
the lap joint region of the two ribbon-shaped high-temperature superconductors 100 is overlapped, and the lap joint length is controlled to be 60mm to 80 mm. Tin solder is added between the lap joint regions of the two ribbon high temperature superconductors 100. And heating the tin solder until the tin solder is melted, and welding the lap joint areas together through the solder to form the welding joint 10. In an alternative embodiment, the heating temperature is 180 ℃ to 220 ℃.
In this embodiment, molten tin solder may be optionally applied to the lap zone of the processed one of the tape-shaped high temperature superconductors 100. After repeated coating for many times, the lap joint areas of the two high-temperature strip superconductors 100 are attached together, placed in a positioning groove of a welding fixture with the temperature of 180 ℃ and the forward pressure of 0.1MPa, kept for 2min for pressure welding, and finally the welding of the low-resistance yttrium high-temperature superconductor based on the nano silver solder is completed to form a welding joint.
Optionally, a solid sheet tin solder may be placed between the overlapping areas of the two ribbon high temperature superconductors 100, placed in a positioning groove of a welding fixture at a temperature of 220 ℃ and a forward pressure of 0.1MPa, and kept for 2min for pressure welding, so as to finally complete the welding of the low resistance yttrium high temperature superconductor based on the nano silver solder, and form a welded joint.
Referring to fig. 2, in one embodiment, a solder joint 10 for a high temperature superconductor is provided. Two tape-shaped high-temperature superconductors 100 are welded into the welded joint 10 by the welding method according to any one of the above embodiments, and the overlapping length of the welded joint 10 is 60mm to 80 mm. In one embodiment, the weld joint 10 has a joint resistance of less than 20n Ω.
In this embodiment, the overlapping length of the welded joint 10 is 60mm to 80 mm. When the overlapping length of the welding joint 10 is more than 60mm, the reduction of the welding resistance is no longer obvious, so that the overlapping length of the welding joint 10 of 60mm to 80mm can ensure both smaller overlapping resistance and mechanical performance of the strip.
Referring to fig. 3, in one embodiment, a soldering apparatus 20 for high temperature superconductors is provided. The welding apparatus 20 includes a strip clamp 200, an induction heating member 300, and an induction heating controller.
The strip clamp 200 includes a lap length control element 210. The overlapping length control element 210 is used to control the overlapping length of the welded joint 10 to be 60mm-80 mm. The induction heating unit 300 is disposed at the strip jig 200, and provides heat to the strip jig 200.
In this embodiment, two superconducting tapes to be welded are clamped by the tape clamp 200. The lap joint area of the two superconducting tapes to be welded is coated with solder, such as soldering tin. The length of the overlapping region of the two superconducting tapes to be welded can be controlled to be 60mm to 80mm by the overlapping length control element 210. The induction heating unit 300 is controlled by an induction heating controller to heat the tape jig 200 so that the solder is melted, and the melted solder is uniformly distributed between the superconducting tapes to be welded under the stress of the tape jig 200. The induction heating controller is a power electronic device switching power supply and can provide power output with a given duty ratio, so that a given current voltage is provided for the heating coil to provide stable heating temperature.
The induction heating unit 300 includes a heating coil and a heat insulating layer fitted over the heating coil. The heating coil is connected with the induction heating controller. The superconducting tapes to be welded are placed in the receiving grooves of the tape clamp 200 and are fixedly clamped by an external clamping device. The jig loaded with the superconducting tape is integrally disposed inside the induction heating unit 300. The outer diameter of the jig is matched with the inner diameter of the induction heating unit 300, the difference between the outer diameter and the inner diameter is 3mm-4mm, and a heat insulation layer may or may not be arranged inside the heating coil.
The strip clamp 200 includes two semi-cylindrical clamp blocks with a strip receiving groove in the middle. The width direction of the accommodating groove on each semi-cylindrical clamping block is parallel to the rectangular end face of each semi-cylindrical clamping block. The width of the accommodating groove is slightly larger than that of the superconducting strip to be welded, and the depth of the accommodating groove is equal to the sum of the thickness of the strip and half of the thickness of the welding layer. The lap length control element 210 may be a receiving groove with a scale. The lap length control element 210 may also be a displacement sensor disposed on the strip clamp 200. And the two semi-cylindrical clamping blocks are clamped tightly by a clamping device. The clamping device can be an open bundling hoop. The heating coil is sleeved outside a cylindrical strip clamp 200 formed by the two semi-cylindrical clamping blocks.
The heating coil may be formed by winding a copper wire. In practical applications, the material for manufacturing the heating coil is not limited by the copper wire. The heating coil may also be made of other electrically conductive materials. The heat insulation layer is made of heat insulation materials. The heat insulating layer can prevent the heat that heating coil produced from giving off to guarantee to provide sufficient heat for welding material and make welding material melt, secondly still can prevent that heating coil from contacting operating personnel skin or other article, avoid scalding.
The superconducting tapes to be welded are placed in the receiving grooves of the tape clamp 200 and are fixedly clamped by an external clamping device. The jig loaded with the superconducting tape is integrally disposed inside the induction heating unit 300. The outer diameter of the jig is matched with the inner diameter of the induction heating unit 300, the difference between the outer diameter and the inner diameter is 3mm-4mm, and a heat insulation layer may or may not be arranged inside the heating coil.
After the two semi-cylindrical clamping blocks are aligned, the two semi-cylindrical clamping blocks are fixed by an open type strapping hoop and a matched fastening bolt. And forming a lap joint section in the clamp according to the determined lap joint length by the first superconducting tape and the second superconducting tape. The length of the overlapping section is 5cm to 10cm shorter than the length of the induction heating unit 300, and the overlapping section is aligned with the center of the induction heating unit 300 in the length direction.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A method of welding a high temperature superconductor, comprising:
s10, providing two strip-shaped high-temperature superconductors (100), and respectively polishing the two strip-shaped high-temperature superconductors (100) to remove a metal oxide layer on the surface of each strip-shaped high-temperature superconductor (100) to form a lap joint region;
s20, respectively cleaning the lap joint areas of the two strip-shaped high-temperature superconductors (100), and drying the cleaned lap joint areas;
s30, welding the lap joint areas of the two ribbon-shaped high-temperature superconductors (100) together by using solder to form a welding joint (10);
wherein, two overlap joint district is direct just setting up, the overlap joint length of welded joint (10) is 60mm to 80 mm.
2. The method of claim 1, wherein the solder has a thickness of 0.01mm to 0.1 mm.
3. The method of claim 1, wherein the solder is one of tin solder or nano-silver solder.
4. The method for welding a high temperature superconductor according to claim 1, wherein the step of welding the lap joint regions of the two tape-shaped high temperature superconductors (100) together by using solder to form the welded joint (10) at S30 comprises:
coating the lap joint region of one of the strip-shaped high-temperature superconductors (100) by using nano silver solder, and standing for a preset time;
overlapping the overlapping regions of the two ribbon-shaped high-temperature superconductors (100), and controlling the overlapping length to be 60mm-80 mm;
and (3) placing the two overlapped high-temperature strip superconductors (100) in a positioning groove of a welding clamp with preset temperature and preset forward pressure, and performing pressure welding for preset time to form the welding joint (10).
5. The method for welding a high temperature superconductor according to claim 4, wherein the predetermined temperature is 100 ℃ to 200 ℃, the predetermined forward pressure is 0.3MPa to 1MPa, and the predetermined time is 1min to 5 min.
6. The method of welding a high temperature superconductor according to claim 5, wherein the step of S30 welding the lap joint regions of the two tape-shaped high temperature superconductors (100) together with a solder to form the welded joint (10) comprises:
overlapping the overlapping regions of the two ribbon-shaped high-temperature superconductors (100), and controlling the overlapping length to be 60mm-80 mm;
providing tin solder, and placing the tin solder between the lap joint areas of the two high-temperature strip superconductors (100);
and heating the tin solder until the tin solder is melted, and welding the lap joint areas together through the solder to form the welding joint (10).
7. The method of welding a high temperature superconductor according to claim 6, wherein the heating temperature is 180 ℃ to 220 ℃.
8. A welded joint of high temperature superconductors, characterized in that two strip-shaped high temperature superconductors (100) are welded into the welded joint (10) by the welding method according to any one of claims 1 to 7, the overlapping length of the welded joint (10) being 60mm to 80 mm.
9. A weld joint of a high temperature superconductor according to claim 8, wherein the joint resistance of the weld joint (10) is less than 20n Ω.
10. A device for soldering a high temperature superconductor, comprising:
a strip clamp (200) comprising a lap length control element (210), the lap length control element (210) being for controlling the lap length of a welded joint (10) to be 60mm-80 mm; and
an induction heating unit (300) disposed at the strip clamp (200) for providing heat to the strip clamp (200).
11. The welding apparatus for high temperature superconductors according to claim 10, wherein the overlapping length control element (210) is a graduated receiving groove.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826789A (en) * | 2016-03-29 | 2016-08-03 | 上海大学 | ReBa2Cu3O7-[Delta] high-temperature superconducting-thin film strip attachment technology and pressure heating system thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826789A (en) * | 2016-03-29 | 2016-08-03 | 上海大学 | ReBa2Cu3O7-[Delta] high-temperature superconducting-thin film strip attachment technology and pressure heating system thereof |
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