A method for preparing an aluminum channel WIC superconducting wire by embedding and welding

Abstract

This invention discloses a method for preparing WIC superconducting wire inlay welding of aluminum channel wires, belonging to the field of superconducting wire processing technology. The method includes: mixing deionized water and anhydrous ethanol, stirring, and heating to obtain a first mixture; slowly adding preheated polyethylene glycol PEG-400, xanthan gum, and weighed sodium benzoate sequentially to the first mixture to obtain a second mixture; slowly adding weighed stannous fluoroborate and succinic acid sequentially to the second mixture, and then cooling to room temperature to obtain a special flux for aluminum channel wire inlay welding; selecting the workpiece to be inlaid and welded; setting the welding temperature and stretching speed; and completing the inlay welding preparation using the special flux for aluminum channel wire inlay welding under argon protection. This application improves the continuous stability and forming effect of aluminum channel wire WIC superconducting wire inlay welding preparation by designing and preparing a special flux with specific components and combining it with argon protection technology.

Description

Technical Field

[0001] This application relates to the field of superconducting wire processing technology, and in particular to a method for preparing aluminum channel wire WIC superconducting wire by inlay welding. Background Technology

[0002] Wire-in-channel (WIC) superconducting wires are high-performance wires that combine aluminum channel design with superconducting technology. Currently, the manufacturing processes for superconductors such as NbTi, Nb3Sn, MgB2, and Bi-2212 are mature and their performance is stable. They can utilize the zero-resistance characteristics of superconducting materials to achieve efficient and lossless current transmission. Simultaneously, aluminum's high thermal and electrical conductivity allows for rapid heat dissipation during superconducting magnet quench failure, improving system safety. Due to its lightweight, high thermal conductivity, and cost advantages, WIC superconducting wires are irreplaceable in high-energy physics, medical MRI, nuclear fusion, and power systems, and their future applications will expand to aerospace and civilian energy fields. Because aluminum channels are highly susceptible to oxidation, research is needed on the inlay welding preparation method for WIC superconducting wires.

[0003] In the prior art, Chinese patent CN119381082A discloses an aluminum channel wire WIC superconducting wire and its preparation method, including: selecting a processing part according to the aluminum channel wire WIC superconducting wire preparation process, the processing part including an aluminum channel wire, a superconducting round wire and two rolls of solder round wire; threading the superconducting round wire into the groove of the aluminum channel wire, then symmetrically embedding the two rolls of solder round wire into the groove between the aluminum channel wire and the superconducting round wire, and finally obtaining the aluminum channel wire WIC superconducting wire through induction heating and online solder melting.

[0004] However, the existing technology mentioned above does not take into account the role of flux in the inlay welding of aluminum channel wire WIC superconducting wire, resulting in poor continuity stability and forming effect in the inlay welding of aluminum channel wire WIC superconducting wire. Summary of the Invention

[0005] This application provides a method for preparing WIC superconducting wire inlay welding of aluminum channel wires, which solves the problem that the existing technology does not consider the role of flux in the preparation of WIC superconducting wire inlay welding of aluminum channel wires, resulting in poor continuity stability and forming effect in the preparation of WIC superconducting wire inlay welding of aluminum channel wires.

[0006] On the one hand, this application provides a method for preparing aluminum channel wire WIC superconducting wire inlay welding, including the following steps:

[0007] Step 1: Set and weigh the raw materials for the special flux for aluminum channel wire embedding welding, including deionized water, anhydrous ethanol, succinic acid, stannous fluoroborate, polyethylene glycol PEG-400, xanthan gum, and sodium benzoate.

[0008] Step 2: Mix the deionized water and the anhydrous ethanol, stir and heat to obtain the first mixture.

[0009] Step 3: Preheat the polyethylene glycol PEG-400 and the xanthan gum in water respectively.

[0010] Step four: The preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence and stirred separately to obtain the second mixture.

[0011] Step 5: Slowly add the stannous fluoroborate and succinic acid weighed in Step 1 to the second mixture in sequence, and stir them separately. Then cool to room temperature to obtain a special flux for aluminum channel wire inlay welding.

[0012] Step 6: Select the parts to be inlaid and welded, including superconducting round wires and aluminum channel wires of the corresponding specifications.

[0013] Step 7: Set the welding temperature and stretching speed, and use the special flux for aluminum channel wire embedding welding to complete the embedding welding of aluminum channel wire WIC superconducting wire under argon protection.

[0014] In one possible implementation, in step one, the deionized water accounts for 81% to 93.5% by mass, the anhydrous ethanol accounts for 5% to 15% by mass, the succinic acid accounts for 0.5% to 2% by mass, the stannous fluoroborate accounts for 0.6% to 1.2% by mass, the polyethylene glycol PEG-400 accounts for 0.1% to 0.2% by mass, the xanthan gum accounts for 0.1% to 0.2% by mass, and the sodium benzoate accounts for 0.2% to 0.4% by mass.

[0015] In one possible implementation, in step two, the deionized water and the anhydrous ethanol are mixed and stirred at 100-150 r / min for 2-3 min, and then heated to 50-60°C to obtain the first mixture.

[0016] In one possible implementation, in step three, the polyethylene glycol PEG-400 and the xanthan gum are preheated in water at 50-60°C for 60-100 seconds, respectively.

[0017] In one possible implementation, in step four, the preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence, and stirred for 5 to 7 minutes at 100 to 150 r / min and 50 to 60°C to obtain the second mixture.

[0018] In one possible implementation, in step five, the stannous fluoroborate and succinic acid weighed in step one are slowly added to the second mixture in sequence, and stirred for 5 to 7 minutes at 100 to 150 r / min and 50 to 60°C, respectively, and then cooled to room temperature to obtain a special flux for aluminum channel wire inlay welding.

[0019] In one possible implementation, in step seven, the welding temperature is set to 300~350℃ and the tensile speed is set to 30~100m / min.

[0020] In one possible implementation, in step seven, the superconducting round wire and the aluminum channel wire are sequentially passed through a deoxidation tank, a flux tank, an argon protection device, an inlay welding device, a cooling water device, a traction machine, an eddy current flaw detector, and a take-up machine. The special flux for inlay welding of the aluminum channel wire is added to the flux tank until it covers the superconducting round wire and the aluminum channel wire. The argon protection device is then turned on to prepare the inlay welding of the aluminum channel wire WIC superconducting wire.

[0021] In one possible implementation, step seven is followed by:

[0022] Step 8: Evaluate the inlay welding effect based on the eddy current flaw detection results.

[0023] The method for preparing aluminum channel wire WIC superconducting wire inlay welding in this application has the following advantages:

[0024] By designing and preparing a special flux with specific components for aluminum channel wire embedding welding, and combining it with argon protection technology, the continuous stability and forming effect of aluminum channel wire WIC superconducting wire embedding welding preparation were improved. Specifically, after removing the surface oxide layer from the aluminum channel wire, a high-viscosity aluminum channel wire embedding welding flux is immediately applied to physically cover the aluminum channel wire, serving as the first anti-oxidation mechanism. Succinic acid added to the aluminum channel wire embedding welding flux promptly reduces the alumina that has been re-formed, serving as the second anti-oxidation mechanism. Argon gas protection is then added before embedding welding, serving as the third anti-oxidation mechanism. Stannous fluoroborate added to the aluminum channel wire embedding welding flux melts in high-temperature liquid solder and covers the surface of the aluminum channel wire, eliminating the oxidation of the aluminum channel wire by trace amounts of oxygen and moisture, serving as the fourth anti-oxidation mechanism. This completely eliminates the oxidation problem of the aluminum channel wire, solving the problems of reliance on operator experience, poor welding stability, and insufficient production capacity inherent in traditional aluminum channel wire WIC superconducting wires. Furthermore, a special flux preparation method for the difficult bonding of the Al-Cu interface has been explored, leading to a preparation route for aluminum channel wire WIC superconducting wires that can be continuously and stably welded, with higher production efficiency and better forming effect. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart illustrating a method for preparing WIC superconducting wire inlay welding of aluminum channel wires, as provided in an embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] like Figure 1 As shown in the figure, this application provides a method for preparing aluminum channel wire WIC superconducting wire inlay welding, including the following steps:

[0029] Step 1: Set and weigh the raw materials for the special flux for aluminum channel wire embedding welding, including deionized water, anhydrous ethanol, succinic acid, stannous fluoroborate, polyethylene glycol PEG-400, xanthan gum, and sodium benzoate.

[0030] Step 2: Mix the deionized water and the anhydrous ethanol, stir and heat to obtain the first mixture.

[0031] Step 3: Preheat the polyethylene glycol PEG-400 and the xanthan gum in water respectively.

[0032] Step four: The preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence and stirred separately to obtain the second mixture.

[0033] Step 5: Slowly add the stannous fluoroborate and succinic acid weighed in Step 1 to the second mixture in sequence, and stir them separately. Then cool to room temperature to obtain a special flux for aluminum channel wire inlay welding.

[0034] Step 6: Select the parts to be inlaid and welded, including superconducting round wires and aluminum channel wires of the corresponding specifications.

[0035] Step 7: Set the welding temperature and stretching speed, and use the special flux for aluminum channel wire embedding welding to complete the embedding welding of aluminum channel wire WIC superconducting wire under argon protection.

[0036] Specifically, deionized water is used as the main solvent, anhydrous ethanol as a co-solvent, succinic acid as an antioxidant, stannous fluoroborate as an activator, polyethylene glycol PEG-400 as a stabilizer, xanthan gum as a thickener, and sodium benzoate as a preservative.

[0037] Example 1:

[0038] For example, in step one, the deionized water accounts for 93.5% by mass, the anhydrous ethanol accounts for 5% by mass, the succinic acid accounts for 0.5% by mass, the stannous fluoroborate accounts for 0.6% by mass, the polyethylene glycol PEG-400 accounts for 0.1% by mass, the xanthan gum accounts for 0.1% by mass, and the sodium benzoate accounts for 0.2% by mass.

[0039] For example, in step two, the deionized water and the anhydrous ethanol are mixed and stirred at 100 r / min for 2 min, and then heated to 50°C to obtain the first mixture.

[0040] For example, in step three, the polyethylene glycol PEG-400 and the xanthan gum are preheated in water at 50°C for 60 seconds.

[0041] For example, in step four, the preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence, and stirred for 5 minutes at 150 r / min and 50°C to obtain the second mixture.

[0042] For example, in step five, the stannous fluoroborate and succinic acid weighed in step one are slowly added to the second mixture in sequence, and stirred for 5 minutes at 150 r / min and 50°C, respectively, and then cooled to room temperature to obtain a special flux for aluminum channel wire inlay welding.

[0043] In step six, select an NbTi / Cu superconducting round wire with a diameter of 0.5 mm and an aluminum groove wire with a width of 2.2 mm, a height of 1.43 mm, and a groove width of 0.52 mm.

[0044] For example, in step seven, the welding temperature is set to 300°C and the stretching speed is set to 100 m / min.

[0045] For example, in step seven, the superconducting round wire and the aluminum channel wire are sequentially passed through an oxidation tank, a flux tank, an argon gas protection device, an inlay welding device, a cooling water device, a traction machine, an eddy current flaw detector, and a take-up machine. The special flux for inlay welding of the aluminum channel wire is added to the flux tank until it covers the superconducting round wire and the aluminum channel wire. The argon gas protection device is turned on to prepare the inlay welding of the aluminum channel wire WIC superconducting wire (500m long, 2.12×1.38mm in size).

[0046] For example, step seven is followed by:

[0047] Step 8: Evaluate the inlay welding effect through eddy current testing results. By observing the surface quality of the aluminum channel wire WIC superconducting wire obtained in Step 7, the surface is free of tin nodules, the tin plating is smooth, the number of eddy current alarm signals corresponding to the missing solder joints is 0, and the RRR value detected under 273K / 10K conditions is 103.

[0048] Example 2:

[0049] For example, in step one, the mass percentage of deionized water is 81%, the mass percentage of anhydrous ethanol is 15%, the mass percentage of succinic acid is 2%, the mass percentage of stannous fluoroborate is 1.2%, the mass percentage of polyethylene glycol PEG-400 is 0.2%, the mass percentage of xanthan gum is 0.2%, and the mass percentage of sodium benzoate is 0.4%.

[0050] For example, in step two, the deionized water and the anhydrous ethanol are mixed and stirred at 150 r / min for 3 min, and then heated to 60°C to obtain the first mixture.

[0051] For example, in step three, the polyethylene glycol PEG-400 and the xanthan gum are preheated in water at 60°C for 100 seconds.

[0052] For example, in step four, the preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence, and stirred for 7 minutes at 100 r / min and 60°C to obtain the second mixture.

[0053] For example, in step five, the stannous fluoroborate and succinic acid weighed in step one are slowly added to the second mixture in sequence, and stirred for 7 minutes at 100 r / min and 60°C, respectively, and then cooled to room temperature to obtain a special flux for aluminum channel wire inlay welding.

[0054] In step six, select an NbTi / Cu superconducting round wire with a diameter of 1.0 mm and an aluminum groove wire with a width of 3.10 mm, a height of 1.86 mm, and a groove width of 1.03 mm.

[0055] For example, in step seven, the welding temperature is set to 350°C and the stretching speed is set to 30 m / min.

[0056] For example, in step seven, the superconducting round wire and the aluminum channel wire are sequentially passed through an oxidation tank, a flux tank, an argon gas protection device, an inlay welding device, a cooling water device, a traction machine, an eddy current flaw detector, and a take-up machine. The special flux for inlay welding of the aluminum channel wire is added to the flux tank until it covers the superconducting round wire and the aluminum channel wire. The argon gas protection device is turned on to prepare the inlay welding of the aluminum channel wire WIC superconducting wire (500m long, 3.00×1.80mm in size).

[0057] For example, step seven is followed by:

[0058] Step 8: Evaluate the inlay welding effect through eddy current testing results. By observing the surface quality of the aluminum channel wire WIC superconducting wire obtained in Step 7, the surface is free of tin nodules, the tin plating is smooth, the number of eddy current alarm signals corresponding to the missing solder joints is 0, and the RRR value detected under 273K / 10K conditions is 115.

[0059] Example 3:

[0060] For example, in step one, the deionized water accounts for 87.5% by mass, the anhydrous ethanol accounts for 10% by mass, the succinic acid accounts for 1% by mass, the stannous fluoroborate accounts for 0.9% by mass, the polyethylene glycol PEG-400 accounts for 0.15% by mass, the xanthan gum accounts for 0.15% by mass, and the sodium benzoate accounts for 0.3% by mass.

[0061] For example, in step two, the deionized water and the anhydrous ethanol are mixed and stirred at 120 r / min for 2.5 min, and then heated to 55°C to obtain the first mixture.

[0062] For example, in step three, the polyethylene glycol PEG-400 and the xanthan gum are preheated in water at 55°C for 80 seconds.

[0063] For example, in step four, the preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence, and stirred for 6 minutes at 120 r / min and 55°C to obtain the second mixture.

[0064] For example, in step five, the stannous fluoroborate and succinic acid weighed in step one are slowly added to the second mixture in sequence, and stirred for 6 minutes at 120 r / min and 55°C, and then cooled to room temperature to obtain a special flux for aluminum channel wire inlay welding.

[0065] In step six, select an NbTi / Cu superconducting round wire with a diameter of 0.7 mm and an aluminum groove wire with a width of 2.85 mm, a height of 1.58 mm, and a groove width of 0.73 mm.

[0066] For example, in step seven, the welding temperature is set to 320°C and the stretching speed is set to 60 m / min.

[0067] For example, in step seven, the superconducting round wire and the aluminum channel wire are sequentially passed through an oxidation tank, a flux tank, an argon gas protection device, an inlay welding device, a cooling water device, a traction machine, an eddy current flaw detector, and a take-up machine. The special flux for inlay welding of the aluminum channel wire is added to the flux tank until it covers the superconducting round wire and the aluminum channel wire. The argon gas protection device is turned on to prepare the inlay welding of the aluminum channel wire WIC superconducting wire (500m long, 2.80×1.50mm in size).

[0068] For example, step seven is followed by:

[0069] Step 8: Evaluate the inlay welding effect through eddy current testing results. By observing the surface quality of the aluminum channel wire WIC superconducting wire obtained in Step 7, the surface is free of tin nodules, the tin plating is smooth, the number of eddy current alarm signals corresponding to the missing solder joints is 0, and the RRR value detected under 273K / 10K conditions is 112.

[0070] In other possible embodiments, the stannous fluoroborate in step one can be replaced with zinc fluoroaluminate, zinc fluoroborate, stannous fluoroaluminate, or other key components of high-efficiency flux specifically designed for copper-aluminum welding, depending on the application environment.

[0071] In other possible embodiments, the succinic acid in step one can also be supplemented with dibasic acids such as oxalic acid under different flux application environments to avoid secondary oxidation of the aluminum channel line.

[0072] In other possible embodiments, under different flux application environment conditions, the raw materials in step one may also include corrosion inhibitors, matting agents, film-forming agents, etc.

[0073] This application embodiment improves the continuous stability and forming effect of aluminum channel wire WIC superconducting wire inlay welding by designing and preparing a special flux with specific components and combining it with argon protection technology. Specifically, after removing the surface oxide layer from the aluminum channel wire, a high-viscosity aluminum channel wire embedding welding flux is immediately applied to physically cover the aluminum channel wire, serving as the first anti-oxidation mechanism. Succinic acid added to the aluminum channel wire embedding welding flux promptly reduces the alumina that has been re-formed, serving as the second anti-oxidation mechanism. Argon gas protection is then added before embedding welding, serving as the third anti-oxidation mechanism. Stannous fluoroborate added to the aluminum channel wire embedding welding flux melts in high-temperature liquid solder and covers the surface of the aluminum channel wire, eliminating the oxidation of the aluminum channel wire by trace amounts of oxygen and moisture, serving as the fourth anti-oxidation mechanism. This completely eliminates the oxidation problem of the aluminum channel wire, solving the problems of reliance on operator experience, poor welding stability, and insufficient production capacity inherent in traditional aluminum channel wire WIC superconducting wires. Furthermore, a special flux preparation method for the difficult bonding of the Al-Cu interface has been explored, leading to a preparation route for aluminum channel wire WIC superconducting wires that can be continuously and stably welded, with higher production efficiency and better forming effect.

[0074] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0075] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for preparing aluminum channel wire WIC superconducting wire by inlay welding, characterized in that, Includes the following steps: Step 1: Set and weigh the raw materials for the special flux for aluminum channel wire embedding welding, including deionized water, anhydrous ethanol, succinic acid, stannous fluoroborate, polyethylene glycol PEG-400, xanthan gum, and sodium benzoate. Step 2: Mix the deionized water and the anhydrous ethanol, stir and heat to obtain the first mixture; Step 3: Preheat the polyethylene glycol PEG-400 and the xanthan gum in water respectively; Step 4: Slowly add the preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in Step 1 to the first mixture in sequence, and stir each mixture separately to obtain the second mixture. Step 5: Add the stannous fluoroborate and succinic acid weighed in Step 1 to the second mixture in sequence and stir them separately. Then cool to room temperature to obtain a special flux for aluminum channel wire embedding welding. Step 6: Select the parts to be inlaid and welded, including superconducting round wires and aluminum channel wires of the corresponding specifications; Step 7: Set the welding temperature and stretching speed, and use the special flux for aluminum channel wire embedding welding to complete the embedding welding of aluminum channel wire WIC superconducting wire under argon protection. In step one, the deionized water accounts for 81% to 93.5% by mass, the anhydrous ethanol accounts for 5% to 15% by mass, the succinic acid accounts for 0.5% to 2% by mass, the stannous fluoroborate accounts for 0.6% to 1.2% by mass, the polyethylene glycol PEG-400 accounts for 0.1% to 0.2% by mass, the xanthan gum accounts for 0.1% to 0.2% by mass, and the sodium benzoate accounts for 0.2% to 0.4% by mass. In step two, the deionized water and the anhydrous ethanol are mixed and stirred at 100-150 r / min for 2-3 min, and then heated to 50-60℃ to obtain the first mixture. In step four, the preheated polyethylene glycol PEG-400, xanthan gum, and sodium benzoate weighed in step one are slowly added to the first mixture in sequence, and stirred for 5 to 7 minutes at 100 to 150 r / min and 50 to 60°C to obtain the second mixture. In step five, the stannous fluoroborate and succinic acid weighed in step one are slowly added to the second mixture in sequence, and stirred for 5 to 7 minutes at 100 to 150 r / min and 50 to 60°C, respectively. Then, the mixture is cooled to room temperature to obtain a special flux for aluminum channel wire inlay welding. In step seven, the welding temperature is set to 300~350℃ and the tensile speed is set to 30~100m / min; In step seven, the superconducting round wire and the aluminum channel wire are sequentially passed through the deoxidation tank, the flux tank, the argon gas protection device, the inlay welding device, the cooling water device, the traction machine, the eddy current flaw detector, and the take-up machine. The special flux for inlay welding of the aluminum channel wire is added to the flux tank until it covers the superconducting round wire and the aluminum channel wire. The argon gas protection device is turned on to prepare the inlay welding of the aluminum channel wire WIC superconducting wire.

2. The method for preparing aluminum channel wire WIC superconducting wire inlay welding according to claim 1, characterized in that, In step three, the polyethylene glycol PEG-400 and the xanthan gum are preheated in water at 50-60°C for 60-100 seconds respectively.

3. The method for preparing aluminum channel wire WIC superconducting wire inlay welding according to claim 1, characterized in that, Step seven is followed by: Step 8: Evaluate the inlay welding effect based on the eddy current flaw detection results.

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