CN112207383A - Microwave passive device brazing method and device - Google Patents
Microwave passive device brazing method and device Download PDFInfo
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- CN112207383A CN112207383A CN202010981035.3A CN202010981035A CN112207383A CN 112207383 A CN112207383 A CN 112207383A CN 202010981035 A CN202010981035 A CN 202010981035A CN 112207383 A CN112207383 A CN 112207383A
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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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
-
- 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
- B23K1/008—Soldering within a furnace
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
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Abstract
The invention discloses a method and a device for soldering a microwave passive device, wherein the method comprises the following steps: preparing a welding part according to the target size of the microwave source device, the size of the welding part subjected to oxidation layer removal corrosion, the size deviation generated in the heating process of the welding part and the size of the increase of the welding seam gap; arranging a welding limiting stop table at the edge of a welding seam of the welding part; preparing sheet solder matched with the welding parts; cleaning the welding parts according to preset conditions; and placing the sheet brazing filler metal into a welding seam in the welded part for brazing. The brazing method of the microwave passive device disclosed by the invention can be used for preparing the microwave passive device with high precision and size.
Description
Technical Field
The invention belongs to the technical field of device processing, and particularly relates to a method and a device for brazing a microwave passive device.
Background
Microwave passive devices are generally used as microwave transmission channels and are important components of microwave systems. The structure of the existing microwave passive device is schematically shown in fig. 1, and the microwave passive device is formed by connecting an upper part and a lower part with ring grooves by using compression screws. Along with the development requirements of high-frequency-band microwave passive devices, the microwave passive devices are smaller in required size, the inner cavity channel structure is more complex, the processing precision is higher and higher, and the requirement of the high-frequency-band microwave passive devices cannot be met by a compression screw connection method adopted by the original microwave passive devices.
It can be seen that there is a need for those skilled in the art to develop a precise brazing method for microwave passive devices.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing microwave passive device has low processing precision.
In order to solve the technical problem, the invention discloses a soldering method of a microwave passive device, wherein the soldering method comprises the following steps: preparing a welding part according to the target size of the microwave source device, the size of the welding part subjected to oxidation layer removal corrosion, the size deviation generated in the heating process of the welding part and the size of the increase of the welding seam gap; arranging a welding limiting stop table at the edge of a welding seam of the welding part; preparing sheet solder matched with the welding parts; cleaning the welding parts according to preset conditions; and placing the sheet brazing filler metal into a welding seam in the welded part for brazing.
Preferably, the step of preparing the sheet solder matched with the welded part comprises the following steps:
preparing a sheet brazing filler metal with the same size as the welding seam of the welding part under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of an aluminum alloy material;
and under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of invar steel, preparing the sheet-shaped brazing filler metal with the length equal to that of the welding seam of the welding part and the width longer than that of the welding seam by a preset value.
Preferably, the step of preparing the sheet solder matched with the welded part comprises the following steps:
preparing a sheet solder with the length equal to the welding seam of the welding part and the width shorter than the welding seam by a preset value under the condition that the welding seam structure of the welding part is a T-shaped welding seam and the welding part is made of an aluminum alloy material;
and under the condition that the welding seam structure of the welding part is a T-shaped welding seam and the welding part is made of invar steel, preparing the sheet-shaped brazing filler metal with the length equal to that of the welding seam of the welding part and the width longer than that of the welding seam by a preset value.
Preferably, the step of cleaning the welded part according to the preset condition includes:
and under the condition that the welding parts are aluminum alloy parts, cleaning the welding parts for a preset time by adopting a NaOH solution with the concentration of 10%.
Preferably, the step of placing the brazing sheet material into the weld seam of the welded part for brazing includes:
putting the sheet solder into a welding seam in the welded part to finish assembly;
placing the assembled welding parts in a vacuum furnace;
and starting the vacuum furnace, and brazing the assembled welding parts according to the preset brazing heating temperature and the heat preservation time.
The embodiment of the invention also discloses a microwave passive device soldering device, wherein the device comprises: the first preparation module is used for preparing the welding parts according to the target size of the microwave source device, the size of the welding parts subjected to oxidation layer corrosion removal, the size deviation generated in the heating process of the welding parts and the size of the weld joint gap increase; the setting module is used for setting a welding limiting stop table at the edge of a welding seam of the welding part; the second preparation module is used for preparing the sheet solder matched with the welding parts; the cleaning module is used for cleaning the welding parts according to preset conditions; and the brazing module is used for inserting the sheet brazing filler metal into a welding seam in the welded part for brazing.
Preferably, the second preparation module comprises:
the first submodule is used for preparing sheet-shaped brazing filler metal with the same size as the welding seam of the welding part under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of an aluminum alloy material;
and the second submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width longer than the welding line by a preset value under the condition that the welding line structure of the welding part is a butt welding line and the welding part is made of invar steel.
Preferably, the second preparation module comprises:
the third submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width shorter than that of the welding line by a preset value under the condition that the welding line structure of the welding part is a T-shaped welding line and the welding part is made of an aluminum alloy material;
and the fourth submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width longer than that of the welding line by a preset value under the condition that the welding line structure of the welding part is a T-shaped welding line and the welding part is made of invar steel.
Preferably, the cleaning module is specifically configured to:
and under the condition that the welding part is an aluminum alloy part, cleaning the welding part for a preset time by adopting a NaOH solution with the concentration of 10%.
Preferably, the brazing module includes:
the assembling submodule is used for placing the sheet brazing filler metal into a welding seam in the welded part to complete assembly;
the transmission submodule is used for placing the assembled welding parts in a vacuum furnace;
and the starting submodule is used for starting the vacuum furnace and brazing the assembled welding parts according to the preset brazing heating temperature and the heat preservation time.
According to the microwave passive device brazing method provided by the embodiment of the application, on one hand, the dimension compensation is carried out on the welding part according to the dimension corroded by the oxidation layer of the welding part, the dimension deviation generated in the heating process of the welding part and the dimension increased by the weld gap when the welding part is prepared, and the dimension precision of the brazed microwave passive device can be improved. On the other hand, a welding limit stop table is arranged at the edge of the welding seam of the welding part, and the variation of the welding seam gap can be solidified, so that the size precision of the brazed microwave passive device is controlled.
Drawings
FIG. 1 is a schematic structural diagram of a conventional microwave passive device;
FIG. 2 is a flow chart illustrating steps of a method for soldering a microwave passive device according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a welding limit stop table according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the structural relationship between the welding seam and the brazing sheet according to the embodiment of the present invention;
fig. 5 is a block diagram of a soldering apparatus for microwave passive devices according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and with reference to the attached drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 2 is a schematic flow chart illustrating steps of a soldering method for microwave passive devices according to an embodiment of the present invention.
The brazing method of the microwave passive device comprises the following steps:
step 201: and preparing the welding part according to the target size of the microwave source device, the size of the welding part subjected to oxidation layer removal corrosion, the size deviation generated in the heating process of the welding part and the size of the increase of the welding seam gap.
The welding part comprises an upper cavity and a lower cavity, and a welding seam is formed after the upper cavity and the lower cavity are assembled before the welding part is brazed. The welded parts form a complete inner cavity after being brazed, and the inner cavity size precision of the microwave passive device is the key characteristic of the product. On the basis of the original brazing process method, the technical means of pre-dimensional compensation of the inner cavity structure of the precision processing device before butt welding, design and processing of a welding stop table, precise control of the using amount of the flaky brazing filler metal, precise control of vacuum brazing process parameters and the like are adopted, so that the linear dimensional precision, form and position tolerance, surface roughness, brazing fillet and the like of the processed and molded microwave passive device can be precisely controlled, and the high-precision requirement of the high-frequency microwave passive device with a complex channel structure in the cavity is met.
The volume of the welding part is expanded by heating during the welding heating process, and the volume is contracted during cooling, so that the actual size of the welding part deviates from the designed size. Through analyzing and researching test data, the size of the inner cavity of the welding part is increased by 0.01-0.03 mm in the process.
In conclusion, in the structural design of the welded part, the dimension corroded by the oxidation removing layer, the dimension deviation generated in the heating process of the welded part and the dimension increased by the gap of the welding seam are compensated to the target structural dimension, and the accuracy of the structural dimension of the microwave passive device obtained by final brazing is ensured.
Step 202: and arranging a welding limit stop table at the edge of a welding seam of the welding part.
The brazing uses a sheet brazing filler metal, and the thickness of the brazing filler metal is the weld gap of the welded parts. After the sheet solder is melted, the redundant part of the solder can be extruded out of the welding line under the action of gravity, so that the gap of the welding line is reduced, and the structural size of the welded part is changed.
In general, based on the conditions of uneven structure or stress of a welded part and the like, the change of a welding seam gap cannot be quantified, even the change of the welding seam gap is uneven, and the dimensional precision of the welded part cannot be accurately controlled, so that a limiting stop table is designed on the welded part, and the welding seam gap is effectively controlled through the limiting stop table.
An exemplary weld limit stop is shown in fig. 3. The thickness of a flaky brazing filler metal, namely a soldering lug, is 0.05mm, the height of a welding limiting stop table is 0.02mm, in the brazing process, downward pressure is applied to a welding part through a welding tool, redundant brazing filler metal flows into an overflow groove, the upper part and the lower part of the welding part are tightly attached to the welding limiting stop table, the uniformity of a gap of a welding seam after the brazing filler metal is melted is effectively controlled, and the variation of the gap of the welding seam is solidified, so that the size precision of the welding part is controlled.
Step 203: and preparing the sheet solder matched with the welding parts.
The sheet solder is processed and molded in advance according to the shape and the structure of the welding seam, and process tests show that the volume of the finally formed welding seam is not strictly consistent with that of the sheet solder, so that the using amount of the solder is required to be increased or reduced according to the type of the solder and the structure of the welding seam. The size of the sheet solder is finally determined according to the structure of the welding seam of the welding part, the material of the welding part and the size of the welding seam of the welding part.
In general, the weld joint structure mainly has two forms of butt weld joint and T-shaped weld joint, in order to ensure that enough brazing filler metal is fully filled in the weld joint and the fillet r of brazing is less than or equal to 0.1mm, the use amount of the brazing filler metal is required to have a proper proportional relation with the welding gap, and the shape of the brazing filler metal is designed according to the shape of the weld joint based on the weld joint structure of a welded part.
As shown in fig. 4(a), the brazing of the aluminum alloy welded parts uses the AlSiMg11-1.5 brazing filler metal, and in order to enable the weld quality and the angle to meet the requirements, when the weld structure is a butt weld, the width of the brazing filler metal is equal to that of the weld, and the length of the brazing filler metal is equal to that of the weld. As shown in FIG. 4(b), the solder length of the T-shaped weld should be retracted into the weld by 0.05-0.1 mm. As shown in fig. 4(c) and 4(d), AgCu28 solder is used for the soldering of the invar welded parts, and the length of the solder should extend out of the weld joint by 0.05-0.1 mm, so that the requirements of weld joint quality and angle can be met. The vacuum precision brazing of the wave-free passive device with the multilayer structure can also refer to the scheme. The solder in fig. 4 is a sheet solder.
One way to optionally prepare a brazing sheet compatible with the welded parts is as follows:
preparing a sheet brazing filler metal with the same size as the welding seam of the welding part under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of an aluminum alloy material;
under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of invar steel, preparing sheet-shaped brazing filler metal with the length equal to that of the welding seam of the welding part and the width longer than that of the welding seam by a preset value;
preparing a sheet brazing filler metal with the length equal to the welding seam of the welding part and the width shorter than the welding seam by a preset value under the condition that the welding seam structure of the welding part is a T-shaped welding seam and the welding part is made of an aluminum alloy material;
and under the condition that the welding seam structure of the welding part is a T-shaped welding seam and the welding part is made of invar steel, preparing the sheet brazing filler metal with the length equal to that of the welding seam of the welding part and the width longer than the welding seam by a preset value.
The preset value can be set by a person skilled in the art according to actual requirements, and can be set to any value of 0.05-0.1 mm.
Step 204: and cleaning the welded parts according to preset conditions.
In the actual implementation process, when the welding part is an aluminum alloy part, when the welding part is cleaned according to the preset conditions, the welding part with the preset duration can be cleaned by using a 10% NaOH solution.
Step 205: and (4) placing the sheet solder into a welding seam in a welding part for brazing.
Optionally, a sheet-like brazing filler metal can be put into the weld joint in the welded part to complete assembly; placing the assembled welding parts in a vacuum furnace; and starting the vacuum furnace, and brazing the assembled welding parts according to the preset brazing heating temperature and the heat preservation time.
Compared with the existing passive device welding process, the microwave passive device precise brazing method provided by the embodiment of the invention can better ensure the dimensional precision and form and position tolerance of the welding device and control of a brazing fillet. Compared with a split type high-frequency passive device processing mode of connection through a compression screw, the processing method has the advantages that the weight of welding parts can be reduced, the sealing performance of the connection part is guaranteed, and the requirements of compact structure, high performance, light weight and the like of products can be met. The technology can be applied to the precise brazing of microwave passive products, antenna feed source products, waveguide components and other products.
According to the microwave passive device brazing method provided by the embodiment of the invention, on one hand, the dimension compensation is performed on the welded part according to the dimension of corrosion of the oxidation removal layer of the welded part, the dimension deviation generated in the heating process of the welded part and the dimension increase of the weld gap when the welded part is prepared, so that the dimension precision of the brazed microwave passive device can be improved. On the other hand, a welding limit stop table is arranged at the edge of the welding seam of the welding part, and the variation of the welding seam gap can be solidified, so that the size precision of the brazed microwave passive device is controlled.
Fig. 5 is a block diagram of a soldering apparatus for microwave passive devices according to an embodiment of the present invention.
As shown in fig. 5, the soldering apparatus for microwave passive devices according to the embodiment of the present invention includes:
a first preparation module 501, configured to prepare a welding part with reference to a target size of a microwave source device, a size of a welding part subjected to oxide layer removal corrosion, a size deviation generated in a heating process of the welding part, and a size of a weld gap increase;
a setting module 502, configured to set a welding limit stop table at a weld seam edge of the welded part;
a second preparation module 503, configured to prepare a sheet solder matched with the welded component;
a cleaning module 504, configured to clean the welded component according to a preset condition;
and the brazing module 505 is used for placing the sheet brazing filler metal into the welding seam in the welded part for brazing.
Preferably, the second preparation module comprises:
the first submodule is used for preparing sheet-shaped brazing filler metal with the same size as the welding seam of the welding part under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of an aluminum alloy material;
the second submodule is used for preparing sheet-shaped brazing filler metal which has the length equal to that of a welding seam of the welding part and the width longer than the welding seam by a preset value under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of invar steel;
preferably, the second preparation module comprises:
the third submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width shorter than that of the welding line by a preset value under the condition that the welding line structure of the welding part is a T-shaped welding line and the welding part is made of an aluminum alloy material;
and the fourth submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width longer than that of the welding line by a preset value under the condition that the welding line structure of the welding part is a T-shaped welding line and the welding part is made of invar steel.
Preferably, the cleaning module is specifically configured to:
and under the condition that the welding part is an aluminum alloy part, cleaning the welding part for a preset time by adopting a NaOH solution with the concentration of 10%.
Preferably, the brazing module includes:
the assembling submodule is used for placing the sheet brazing filler metal into a welding seam in the welded part to complete assembly;
the transmission submodule is used for placing the assembled welding parts in a vacuum furnace;
and the starting submodule is used for starting the vacuum furnace and brazing the assembled welding parts according to the preset brazing heating temperature and the heat preservation time.
According to the microwave passive device brazing device provided by the embodiment of the invention, on one hand, the dimension compensation is performed on the welding part according to the dimension of corrosion of the oxidation removal layer of the welding part, the dimension deviation generated in the heating process of the welding part and the dimension increase of the weld gap when the welding part is prepared, so that the dimension precision of the brazed microwave passive device can be improved. On the other hand, a welding limit stop table is arranged at the edge of the welding seam of the welding part, and the variation of the welding seam gap can be solidified, so that the size precision of the brazed microwave passive device is controlled.
For the method embodiment, since it corresponds to the apparatus embodiment, the description is relatively simple, and for the relevant points, refer to the description of the apparatus embodiment section.
It should be noted that the above description is only a preferred embodiment of the present invention, and it should be understood that various changes and modifications can be made by those skilled in the art without departing from the technical idea of the present invention, and these changes and modifications are included in the protection scope of the present invention.
The embodiments in the present description are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the details of the invention not described in detail in this specification are well within the skill of those in the art.
Claims (10)
1. A method of soldering microwave passive devices, the method comprising:
preparing a welding part according to the target size of the microwave source device, the size of the welding part subjected to oxidation layer removal corrosion, the size deviation generated in the heating process of the welding part and the size of the increase of the welding seam gap;
arranging a welding limiting stop table at the edge of a welding seam of the welding part;
preparing sheet solder matched with the welding parts;
cleaning the welding parts according to preset conditions;
and placing the sheet brazing filler metal into a welding seam in the welded part for brazing.
2. The method of claim 1, wherein the step of preparing a sheet solder compatible with the welded part comprises:
preparing a sheet brazing filler metal with the same size as the welding seam of the welding part under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of an aluminum alloy material;
and under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of invar steel, preparing the sheet brazing filler metal with the width equal to that of the welding seam of the welding part and the length longer than that of the welding seam by a preset value.
3. The method of claim 1, wherein the step of preparing a sheet solder compatible with the welded part comprises:
preparing a sheet solder with the length equal to the welding seam of the welding part and the width shorter than the welding seam by a preset value under the condition that the welding seam structure of the welding part is a T-shaped welding seam and the welding part is made of an aluminum alloy material;
and under the condition that the welding seam structure of the welding part is a T-shaped welding seam and the welding part is made of invar steel, preparing the sheet-shaped brazing filler metal with the length equal to that of the welding seam of the welding part and the width longer than that of the welding seam by a preset value.
4. The method of claim 1, wherein the step of cleaning the welded component according to predetermined conditions comprises:
and when the welding part is an aluminum alloy part, cleaning the welding part for a preset time by adopting a NaOH solution with the concentration of 10%.
5. The method of claim 1, wherein the step of placing the brazing sheet material into a weld in the welded component for brazing comprises:
putting the sheet solder into a welding seam in the welded part to finish assembly;
placing the assembled welding parts in a vacuum furnace;
and starting the vacuum furnace, and brazing the assembled welding parts according to the preset brazing heating temperature and the heat preservation time.
6. A microwave passive device soldering apparatus, comprising:
the first preparation module is used for preparing the welding parts according to the target size of the microwave source device, the size of the welding parts subjected to oxidation layer corrosion removal, the size deviation generated in the heating process of the welding parts and the size of the weld joint gap increase;
the setting module is used for setting a welding limiting stop table at the edge of a welding seam of the welding part;
the second preparation module is used for preparing the sheet solder matched with the welding parts;
the cleaning module is used for cleaning the welding parts according to preset conditions;
and the brazing module is used for placing the sheet brazing filler metal into a welding seam in the welded part for brazing.
7. The apparatus of claim 6, wherein the second preparation module comprises:
the first submodule is used for preparing sheet-shaped brazing filler metal with the same size as the welding seam of the welding part under the condition that the welding seam structure of the welding part is a butt welding seam and the welding part is made of an aluminum alloy material;
and the second submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width longer than the welding line by a preset value under the condition that the welding line structure of the welding part is a butt welding line and the welding part is made of invar steel.
8. The apparatus of claim 6, wherein the second preparation module comprises:
the third submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width shorter than that of the welding line by a preset value under the condition that the welding line structure of the welding part is a T-shaped welding line and the welding part is made of an aluminum alloy material;
and the fourth submodule is used for preparing the sheet brazing filler metal with the length equal to that of the welding line of the welding part and the width longer than that of the welding line by a preset value under the condition that the welding line structure of the welding part is a T-shaped welding line and the welding part is made of invar steel.
9. The device of claim 6, wherein the cleaning module is specifically configured to:
and when the welding part is an aluminum alloy part, cleaning the welding part for a preset time by adopting a NaOH solution with the concentration of 10%.
10. The apparatus of claim 6, wherein the brazing module comprises:
the assembling submodule is used for placing the sheet brazing filler metal into a welding seam in the welded part to complete assembly;
the transmission submodule is used for placing the assembled welding parts in a vacuum furnace;
and the starting submodule is used for starting the vacuum furnace and brazing the assembled welding parts according to the preset brazing heating temperature and the heat preservation time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114799387A (en) * | 2022-04-11 | 2022-07-29 | 北航（四川）西部国际创新港科技有限公司 | Vacuum brazing method |
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| CN103928736A (en) * | 2014-04-24 | 2014-07-16 | 成都锦江电子系统工程有限公司 | Self-positioning narrow-side bridge waveguide and vacuum brazing technology thereof |
| CN105643037A (en) * | 2016-03-22 | 2016-06-08 | 东莞洲亮通讯科技有限公司 | Welding process used for passive device |
| CN107096974A (en) * | 2017-05-11 | 2017-08-29 | 哈尔滨工业大学 | A kind of method that soldered seam intensity is improved based on the processing of narrow gap interior thin layer ultrasonic melt grain refining |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114799387A (en) * | 2022-04-11 | 2022-07-29 | 北航（四川）西部国际创新港科技有限公司 | Vacuum brazing method |
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