CN113814601B - Brazing sheet and brazing method - Google Patents
Brazing sheet and brazing method Download PDFInfo
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- CN113814601B CN113814601B CN202111123606.0A CN202111123606A CN113814601B CN 113814601 B CN113814601 B CN 113814601B CN 202111123606 A CN202111123606 A CN 202111123606A CN 113814601 B CN113814601 B CN 113814601B
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0233—Sheets, foils
-
- 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
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/282—Zn as the principal constituent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a brazing sheet and a brazing method, and belongs to the technical field of brazing materials. The brazing sheet comprises a sheet-shaped brazing filler metal matrix, wherein the sheet-shaped brazing filler metal matrix is provided with a welding matching surface for correspondingly contacting with a welding surface of a piece to be welded, a plurality of hard particles are discretely embedded in at least one welding matching surface of the sheet-shaped brazing filler metal matrix, and at least part of hard particles in the plurality of hard particles are exposed out of the welding matching surface. The brazing sheet disclosed by the invention does not contain brazing flux, can realize rapid brazing of aluminum-lithium alloy in the atmospheric environment and on a heating platform, does not pollute the environment, and is environment-friendly.
Description
Technical Field
The invention relates to a brazing sheet and a brazing method, and belongs to the technical field of brazing materials.
Background
The aluminum-lithium alloy has the advantages of small density, high specific strength and specific rigidity, and the like, and the aluminum-lithium alloy replaces common aluminum alloy, so that the weight of the structure can be reduced by 10% -15%, and the aluminum-lithium alloy is an ultra-light structure material with wide application prospect in the aerospace industry.
The melting point of the aluminum-lithium alloy is low, generally not exceeding 580 ℃, and the brazing temperature of the conventional Al-Si brazing filler metal is above 600 ℃, so that the conventional Al-Si brazing filler metal cannot be used for brazing the aluminum-lithium alloy. In addition, since many aluminum-lithium alloy members are subjected to superplastic forming, high strength of aluminum-lithium alloy braze joints is required. At present, the brazing filler metal commonly used for brazing aluminum lithium alloy is Zn-Al brazing filler metal. However, when the existing Zn-Al brazing filler metal and the brazing process are used for brazing aluminum lithium alloy, the corrosion-free brazing flux is matched, and the corrosion-free brazing flux (cesium fluoroaluminate) is easy to react with active element lithium in a base metal, so that a large amount of black slag is generated on the surface of the base metal, the problems of more joint defects, lower strength and the like are caused, and popularization and application of the aluminum lithium alloy brazing joint are seriously affected.
Disclosure of Invention
The invention aims to provide a brazing sheet which is used for solving the problems that when a Zn-Al brazing filler metal is used for brazing aluminum lithium alloy at present, a non-corrosive brazing flux in the brazing filler metal is easy to react with active element lithium in a base metal, so that a large amount of black slag is generated on the surface of the base metal, and a joint is more in defects and lower in strength.
Another object of the invention is to provide a brazing method.
In order to achieve the above object, the technical scheme adopted by the brazing sheet of the invention is as follows:
a brazing sheet comprises a sheet-shaped brazing filler metal matrix, wherein the sheet-shaped brazing filler metal matrix is provided with a welding matching surface for correspondingly contacting with a welding surface of a piece to be welded, a plurality of hard particles are discretely embedded in at least one welding matching surface of the sheet-shaped brazing filler metal matrix, and at least part of hard particles in the plurality of hard particles are exposed out of the welding matching surface.
The brazing sheet disclosed by the invention does not contain brazing flux, can realize rapid brazing of aluminum-lithium alloy in the atmospheric environment and on a heating platform, does not pollute the environment, and is environment-friendly.
Preferably, the two opposite surfaces of the flaky brazing filler metal substrate are welding matching surfaces, and the hard particles are arranged on the two welding matching surfaces.
The same hard particles may be exposed from both the two bonding surfaces of the sheet-like brazing filler metal base, or may be exposed from only one bonding surface. Preferably, among the hard particles exposing the welding surfaces, the same hard particle is exposed from only one of the welding surfaces.
Preferably, the distribution density of the hard particles embedded in the welding matching surface of the sheet-like brazing filler metal matrix is 4 pieces/mm 2 。
Preferably, the hard particles are inorganic hard particles. The hard particles can be dispersed in the brazing seam and alloyed with the brazing filler metal, which is beneficial to improving the joint strength.
Preferably, the hard particles are Si particles. The Si particles can alloy with the braze, helping to improve joint strength.
Preferably, the hard particles have an average particle diameter of 0.15 to 0.2mm.
Preferably, the brazing sheet has a thickness of 0.2 to 0.3mm.
Preferably, the mass ratio of the hard particles to the flaky brazing filler metal matrix is 0.8-3:81-95.8.
Further preferably, the mass ratio of the hard particles to the flaky brazing filler metal matrix is 0.8-3.0:81.5-95.5.
Preferably, the sheet solder matrix consists essentially of Zn and Al.
Preferably, the mass ratio of Zn to Al is 75-85:6-10.
Preferably, the sheet solder base further comprises In.
Preferably, the mass ratio of Zn to In is 75-85:0.5-0.8.
Preferably, the mass ratio of the hard particles to In is 0.8-3:0.5-0.8.
Preferably, the average particle diameter of the Si particles is 0.15-0.2 mm; the thickness of the brazing sheet is 0.2-0.3 mm; the flaky brazing filler metal matrix consists of Zn, al and In, wherein the mass ratio of Zn to Al to In is 75-85:6-10:0.5-0.8; the mass ratio of the hard particles to the flaky brazing filler metal matrix is 0.8-3:81-95.8.
Preferably, the hard particles are embedded on the welding matching surface of the flaky brazing filler metal matrix through hot pressing. Preferably, the temperature of the hot pressing is 120-150 ℃.
The technical scheme adopted by the brazing method is as follows:
a brazing method comprising the steps of: firstly, the brazing sheet is placed between a first to-be-welded piece and a second to-be-welded piece, the brazing sheet and the first to-be-welded piece are relatively fixed in the extending direction of a welding surface, the second to-be-welded piece is enabled to strike the brazing sheet for a plurality of times, the brazing sheet is enabled to strike the first to-be-welded piece until the oxidation film of the welding surface of the first to-be-welded piece and the second to-be-welded piece is removed, and then the brazing sheet is melted, so that brazing is completed.
According to the brazing method, the brazing piece to be welded is impacted on the surface of the brazing sheet, the hard particles embedded on the surface of the brazing sheet remove the oxide film on the surface of the base metal to be welded under the impact action, and meanwhile, the brazing filler metal liquid is promoted to wet and joint, so that the high-reliability and high-strength brazing flux-free brazing of the base metal to be welded is realized.
Preferably, the first part to be welded is made of aluminum-lithium alloy.
Preferably, the material of the second part to be welded is aluminum-lithium alloy.
Preferably, the relative fixing of the brazing sheet and the first part to be welded in the direction of extension of the welding surface is achieved by resistance spot welding or riveting the brazing sheet and the first part to be welded.
Preferably, the temperature used for brazing is 360-400 ℃.
Drawings
FIG. 1 is a schematic view of a brazing apparatus used in the brazing method of the present invention in use, wherein the following reference numerals are used: 1-a heating platform, 2-a first part to be welded, 3-a brazing sheet, 4-hard particles on the brazing sheet, 5-a second part to be welded, 6-a fixed circular ring, 7-a compression spring, 8-a sliding rod, 9-a cross beam, 10-a vertical track and 11-a sliding block;
FIG. 2 is a diagram of the variation of the compression spring during the brazing process;
FIG. 3 is a macroscopic topography of a braze joint resulting from the braze process of comparative example 2;
FIG. 4 is a macro topography of a braze joint obtained by the braze process of example 6;
FIG. 5 is a microstructure of a braze joint obtained by the braze method of comparative example 2;
FIG. 6 shows the microstructure of a braze joint obtained by the braze method of example 6.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
1. Specific examples of the brazing sheet of the present invention are as follows:
example 1
The brazing sheet comprises a sheet brazing filler metal matrix, wherein two opposite surfaces of the sheet brazing filler metal matrix in the thickness direction are welding matching surfaces, a plurality of hard particles are embedded in the welding matching surfaces in a discrete manner, all the hard particles are exposed out of the welding matching surfaces, and each hard particle is exposed out of only one welding matching surface; the brazing sheet comprises a brazing sheet, wherein hard particles, a brazing sheet and a sheet brazing material, wherein the hard particles are Si particles, the average particle size of the Si particles is 0.15mm, the thickness of the brazing sheet is 0.2mm, the hard particles are embedded on a welding matching surface of the sheet brazing material matrix through hot pressing, the hot pressing temperature is 120 ℃, the sheet brazing material matrix consists of Zn, al and In, the mass ratio of Zn, al and In is 75:6:0.5, and the mass ratio of the hard particles to the sheet brazing material matrix is 0.8:81.5.
Example 2
The brazing sheet comprises a sheet brazing filler metal matrix, wherein two opposite surfaces of the sheet brazing filler metal matrix in the thickness direction are welding matching surfaces, a plurality of hard particles are embedded in the welding matching surfaces in a discrete manner, all the hard particles are exposed out of the welding matching surfaces, and each hard particle is exposed out of only one welding matching surface; the brazing sheet comprises a brazing sheet, wherein hard particles, a brazing sheet and a sheet brazing material, wherein the hard particles are Si particles, the average particle size of the Si particles is 0.2mm, the thickness of the brazing sheet is 0.3mm, the hard particles are embedded on a welding matching surface of the sheet brazing material matrix through hot pressing, the hot pressing temperature is 150 ℃, the sheet brazing material matrix consists of Zn, al and In, the mass ratio of Zn, al and In is 78:7:0.6, and the mass ratio of the hard particles to the sheet brazing material matrix is 1:85.6.
Example 3
The brazing sheet comprises a sheet brazing filler metal matrix, wherein two opposite surfaces of the sheet brazing filler metal matrix in the thickness direction are welding matching surfaces, a plurality of hard particles are embedded in the welding matching surfaces in a discrete manner, all the hard particles are exposed out of the welding matching surfaces, and each hard particle is exposed out of only one welding matching surface; the brazing sheet comprises a brazing sheet, wherein hard particles, a brazing sheet and a sheet brazing material, wherein the hard particles are Si particles, the average particle size of the Si particles is 0.17mm, the thickness of the brazing sheet is 0.25mm, the hard particles are embedded on a welding matching surface of the sheet brazing material matrix through hot pressing, the hot pressing temperature is 135 ℃, the sheet brazing material matrix consists of Zn, al and In, the mass ratio of Zn, al and In is 80:8:0.7, and the mass ratio of the hard particles to the sheet brazing material matrix is 1.2:88.7.
Example 4
The brazing sheet comprises a sheet brazing filler metal matrix, wherein two opposite surfaces of the sheet brazing filler metal matrix in the thickness direction are welding matching surfaces, a plurality of hard particles are embedded in the welding matching surfaces in a discrete manner, all the hard particles are exposed out of the welding matching surfaces, and each hard particle is exposed out of only one welding matching surface; the brazing sheet comprises a brazing sheet, wherein hard particles, a brazing sheet and a sheet brazing material, wherein the hard particles are Si particles, the average particle size of the Si particles is 0.18mm, the thickness of the brazing sheet is 0.2mm, the hard particles are embedded on a welding matching surface of the sheet brazing material matrix through hot pressing, the hot pressing temperature is 130 ℃, the sheet brazing material matrix consists of Zn, al and In, the mass ratio of Zn, al and In is 82:9:0.8, and the mass ratio of the hard particles to the sheet brazing material matrix is 2:91.8.
Example 5
The brazing sheet comprises a sheet brazing filler metal matrix, wherein two opposite surfaces of the sheet brazing filler metal matrix in the thickness direction are welding matching surfaces, a plurality of hard particles are embedded in the welding matching surfaces in a discrete manner, all the hard particles are exposed out of the welding matching surfaces, and each hard particle is exposed out of only one welding matching surface; the brazing sheet comprises a brazing sheet, wherein hard particles, a brazing sheet and a sheet brazing material, wherein the hard particles are Si particles, the average particle size of the Si particles is 0.2mm, the thickness of the brazing sheet is 0.3mm, the hard particles are embedded on a welding matching surface of the sheet brazing material matrix through hot pressing, the hot pressing temperature is 140 ℃, the sheet brazing material matrix consists of Zn, al and In, the mass ratio of Zn, al and In is 85:10:0.5, and the mass ratio of the hard particles to the sheet brazing material matrix is 3:95.5.
Comparative example 1
The only difference between this comparative example and example 1 is that the brazing sheet of this comparative example does not contain hard particles.
2. Specific examples of the brazing method of the present invention are as follows:
example 6
The brazing method of this embodiment may be carried out by means of a brazing apparatus as shown in fig. 1. The construction of the soldering apparatus will be described first with reference to fig. 1.
The brazing device comprises a heating platform 1, wherein the heating platform 1 is used for placing one to-be-welded piece and heating the to-be-welded piece. The brazing device further comprises a vertical rail 10 and a cross beam 9 fixedly connected to the upper end of the vertical rail 10, a compression spring 7 is hung on the middle portion of the cross beam 9, the lower end of the compression spring 7 is connected with a fixed ring 6, and the fixed ring 6 is used for detachably connecting another piece to be welded. A slide block 11 is slidably arranged on the vertical track 10 along the up-down direction, a slide rod 8 extending horizontally is arranged on the slide block 11, and the slide rod 8 is of a telescopic sleeve structure. The end of the slide rod 8 is adapted to extend into and out of the stationary ring 6. The compression spring 7 is made of one or any combination of stainless steel, 65Mn and 55CrSi, and can resist high temperature and corrosion and prevent rust from polluting a part to be welded.
The state of change of the compression spring 7 during brazing is shown in fig. 2, and the compression spring 7 is in a natural state when there is close contact between the second part 5 to be welded, the brazing sheet 3 (including the hard particles 4 on the brazing sheet) and the first part 2 to be welded, before the device is started.
The brazing method of the present embodiment may also be performed using other types of brazing apparatus, for example, by manually operating the second work piece 5 to strike the brazing sheet 3 a plurality of times and the brazing sheet 3 to strike the first work piece 2, or by manually operating the compression spring 7 to compress the second work piece 5 to strike the brazing sheet 3 a plurality of times and the brazing sheet 3 to strike the first work piece 2. In the brazing process, the second to-be-welded piece 5 can be firstly impacted on the brazing sheet 3 for a plurality of times, the brazing sheet 3 is impacted on the first to-be-welded piece 2 until the oxide films of the welding surfaces of the first to-be-welded piece 2 and the second to-be-welded piece 5 are removed, then the brazing sheet 3 is heated to complete brazing, or the brazing sheet 3 can be heated in the process that the second to-be-welded piece 5 is impacted on the brazing sheet 3, and the brazing sheet 3 is only required to be not melted before the oxide films of the welding surfaces of the first to-be-welded piece 2 and the second to-be-welded piece 5 are removed, and then the brazing sheet 3 is heated to complete brazing until the oxide films of the welding surfaces of the first to-be-welded piece 2 and the second to-be-welded piece 5 are removed.
The welding method according to the embodiment, when implemented by means of the welding device described above, comprises the following steps:
(1) After the welding surface of the first aluminum lithium alloy 2 and the welding surface of the second aluminum lithium alloy 5 are pretreated (oil stains on the welding surface are removed by alcohol under the action of ultrasonic waves), the first aluminum lithium alloy 2 is placed on the heating platform 1 in a state that the welding surface faces upwards, the back surface of the welding surface of the second aluminum lithium alloy 5 is connected with the stainless steel compression spring 7 above, and the sizes of the first aluminum lithium alloy 2 and the second aluminum lithium alloy 5 are 60mm long, 20mm wide and 2mm thick;
(2) The brazing sheet of example 1 was fixed to the welding face of the first aluminum lithium alloy 2 by resistance spot welding (ensuring that the brazing sheet 3 and the first aluminum lithium alloy 2 were relatively fixed in the extending direction of the welding face) and contacted with the welding face of the second aluminum lithium alloy 5, while the stainless steel compression spring 7 was in a natural state;
(3) Starting a power supply of the heating platform 1, starting heating, penetrating the sliding rod 8 into the fixed circular ring 6, enabling the sliding rod 8 to slide upwards along the vertical track 10, applying external force to the second aluminum lithium alloy 5, enabling the compression spring 7 to be compressed and deviate from the balance position by a certain distance (after the spring is compressed to be 1/3-1/2 long upwards), retracting the extending end of the sliding rod 8, enabling the compression spring 7 to move downwards, enabling the second aluminum lithium alloy 5 to strike the brazing sheet 3 and enable the brazing sheet 3 to strike the first aluminum lithium alloy 2 in the downward movement process of the compression spring 7, then repeating the operation, continuously enabling the second aluminum lithium alloy 5 to strike the brazing sheet 3 and enable the brazing sheet 3 to strike the first aluminum lithium alloy 2 until the oxide film of the welding surfaces of the first aluminum lithium alloy 2 and the second aluminum lithium alloy 5 is removed, enabling the brazing sheet 3 to be nearly melted, enabling the welding surfaces of the first aluminum lithium alloy 2 to be contacted with the welding surfaces of the second aluminum lithium alloy 5, enabling the brazing sheet 3 to be melted into brazing liquid when the temperature of the heating platform 1 reaches 360 ℃, wetting and sealing the brazing liquid, and then closing the power supply, and completing brazing.
Example 7
The present example differs from example 6 only in that the brazing sheet used in step (2) was the brazing sheet of example 2, which was riveted to the welding surface of the first aluminum lithium alloy 2, and in that the temperature of the heating stage in step (3) was 400 ℃.
Example 8
This example differs from example 6 only in that the brazing sheet used in step (2) is the brazing sheet of example 3, and in step (3) the temperature of the heating stage 1 is 380 ℃.
Example 9
The present example differs from example 6 only in that the brazing sheet used in step (2) was the brazing sheet of example 4, which was riveted to the welding surface of the first aluminum lithium alloy 2, and in step (3) the temperature of the heating stage 1 was 370 ℃.
Example 10
This example differs from example 6 only in that the brazing sheet used in step (2) was the brazing sheet of example 5 and in step (3) the temperature of the heating stage 1 was 390 ℃.
Comparative example 2
In the brazing method of the comparative example, the brazing sheet of comparative example 1 was used to perform flux-sensing brazing on the aluminum lithium alloy, and the two aluminum lithium alloys to be welded were each 60mm long, 20mm wide and 2mm thick.
Experimental example
1 morphology of braze joint
The morphology of the braze joint obtained by the braze welding method of comparative example 2 and example 6 is shown in fig. 3, 4, 5 and 6, and as can be seen from fig. 3 and 4, a great amount of black slag is present at the braze joint with brazing flux, and the black slag is serious because lithium in the base material reacts with the brazing flux, and the reduced and precipitated heavy metal contaminates the joint; the braze welding method of example 6 resulted in less black slag at the braze joint and a normal joint morphology. Fig. 5 and 6 show the microstructure of the braze joint, further demonstrating that the braze joint with flux has black slag inside and low braze ratio, while the braze joint without flux (example 6) is more complete and has fewer braze joint defects.
2 shear Strength of braze joint
The tensile shear strength of the braze joints obtained in the braze methods of comparative example 2 and examples 6 to 10 were measured according to the methods of GB/T11363-2008, respectively, and the test results are shown in Table 1. As can be seen from Table 1, the shear strength of the braze joint without flux is much higher than that of the braze joint with flux.
Table 1 tensile shear Strength (MPa) of braze joints obtained by the braze method of comparative example 2 and examples 6 to 10
| Number of tests | Comparative example 2 | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 |
| 1 | 22 | 27 | 31 | 32 | 25 | 36 |
| 2 | 23 | 28 | 29.5 | 31 | 35.4 | 36 |
| 3 | 20.2 | 26.9 | 30 | 33.2 | 34 | 37 |
| 4 | 24 | 28.5 | 28.5 | 32.6 | 34.5 | 36 |
| 5 | 23.3 | 27.8 | 31 | 31.2 | 33.6 | 35 |
| Average value of | 22.5 | 27.6 | 30 | 32 | 32.5 | 36 |
Claims (5)
1. The brazing sheet is characterized by comprising a sheet-shaped brazing filler metal matrix, wherein the sheet-shaped brazing filler metal matrix is provided with a welding matching surface for correspondingly contacting with a welding surface of a piece to be welded, a plurality of hard particles are discretely embedded in at least one welding matching surface of the sheet-shaped brazing filler metal matrix, and at least part of hard particles in the plurality of hard particles are exposed out of the welding matching surface;
the hard particles are Si particles, and the average particle size of the Si particles is 0.15-0.2 mm; the thickness of the brazing sheet is 0.2-0.3 mm; the flaky brazing filler metal substrate consists of Zn, al and In, wherein the mass ratio of Zn to Al to In is 75-85:6-10:0.5-0.8; the mass ratio of the hard particles to the flaky brazing filler metal matrix is 0.8-3:81-95.8;
the brazing sheet is for brazing aluminum lithium alloy.
2. A brazing sheet according to claim 1, wherein the opposed surfaces of the braze sheet matrix are weld-engaging surfaces, and wherein the hard particles are present on both weld-engaging surfaces.
3. Brazing sheet according to claim 1 or 2, wherein among the hard particles exposing the weld mating surfaces, the same hard particles are exposed from only one of the weld mating surfaces.
4. A method of brazing, comprising the steps of: firstly, placing the brazing sheet of any one of claims 1-3 between a first to-be-welded piece and a second to-be-welded piece, and relatively fixing the brazing sheet and the first to-be-welded piece in the extending direction of a welding surface, enabling the second to-be-welded piece to strike the brazing sheet for a plurality of times and enabling the brazing sheet to strike the first to-be-welded piece until oxide films of the welding surfaces of the first to-be-welded piece and the second to-be-welded piece are removed, and then enabling the brazing sheet to be melted to complete brazing;
the first part to be welded is made of aluminum-lithium alloy; the second to-be-welded piece is made of aluminum-lithium alloy.
5. The brazing method according to claim 4, wherein the brazing sheet and the first part to be welded are relatively fixed in the extending direction of the joint surface by resistance spot welding or riveting between the brazing sheet and the first part to be welded.
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| CN202111123606.0A CN113814601B (en) | 2021-09-24 | 2021-09-24 | Brazing sheet and brazing method |
| ZA2021/10703A ZA202110703B (en) | 2021-09-24 | 2021-12-21 | Brazing sheet and brazing method |
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| WO2018123203A1 (en) * | 2016-12-27 | 2018-07-05 | 三菱アルミニウム株式会社 | Brazing sheet for fluxless brazing, fluxless brazing method, and heat exchanger manufacturing method |
| CN110576232B (en) * | 2019-08-12 | 2021-07-16 | 湖南浩威特科技发展有限公司 | Brazing method for high volume fraction silicon carbide particle reinforced aluminum matrix composite and aluminum-silicon alloy |
| CN112264954A (en) * | 2020-10-23 | 2021-01-26 | 江苏韦尔博新材料科技有限公司 | Micro-impression tooth plate |
| CN112338316B (en) * | 2020-10-27 | 2022-07-05 | 国网河南省电力公司电力科学研究院 | Brazing process of high-strength and high-toughness copper-aluminum joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4017480A (en) * | 1974-08-20 | 1977-04-12 | Permanence Corporation | High density composite structure of hard metallic material in a matrix |
| JPS6326295A (en) * | 1986-07-18 | 1988-02-03 | Hitachi Metals Ltd | Corrision-and wear-resistant alloy and composite cylinder thereof |
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