CN109332837A - A kind of vacuum brazing method with thin-wall part structure - Google Patents
A kind of vacuum brazing method with thin-wall part structure Download PDFInfo
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- CN109332837A CN109332837A CN201811389104.0A CN201811389104A CN109332837A CN 109332837 A CN109332837 A CN 109332837A CN 201811389104 A CN201811389104 A CN 201811389104A CN 109332837 A CN109332837 A CN 109332837A
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- thin
- wall part
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
- B23K1/206—Cleaning
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
A kind of vacuum brazing method with thin-wall part structure, step are as follows: cleaning thin-wall part and matching piece；Choose foil nickel-based solder, first foil nickel-based solder is fixed in the way of percussion spot welding on the surface to be welded of thin-wall part, then according to the size of drawing requirement and position, the thin-wall part for presetting foil nickel-based solder and matching piece are combined assembly, and carry out auxiliary positioning in the way of percussion spot welding；Powder brazing alloy is chosen, powder brazing alloy is identical as the trade mark of foil nickel-based solder, first powder brazing alloy and binder is mixed and made into paste in proportion, paste solder is then preset at place outer end to be welded；The assembly that thin-wall part is constituted with matching piece is placed into progress clamping in welding fixture to fix, it is coated with only welding coat in advance on the pedestal of welding fixture and the working face of pressing plate, only welding coat is used to prevent the solder to trickle when soldering from causing the unhelpful connection between assembly and welding fixture；Assembly and welding fixture are fed together in vacuum drying oven, complete soldering in a vacuum furnace.
Description
Technical field
The invention belongs to technical field of aircraft engine part manufacture, more particularly to a kind of with the true of thin-wall part structure
Empty method for welding.
Background technique
So-called band thin-wall part structure is the combination that thin-wall part (wall thickness≤1mm sheet metal component) and matching piece are constituted
Body part, and need to be attached using vacuum brazing between thin-wall part and matching piece.
For the vacuum brazing method with thin-wall part structure, conventional procedures are as follows: thin-wall part and matching piece are first passed through energy storage
Spot welding mode is fixed, and then in the preset paste solder in place outer end to be welded, finally sub-assembly is sent into vacuum drying oven and is completed very
Sky soldering.
But the welding quality of assembly is difficult to ensure using above-mentioned traditional vacuum brazing method, and there are following
Two kinds of problems:
First, during high temperature vacuum brazing, since thermal stress acts on, not only thin-wall part is easily deformed, but also
The solder joint of retaining element position is easy to snap, and thus will lead to can not connect between thin-wall part and matching piece；
Second, in vacuum brazing, the preset paste solder in place outer end to be welded cannot be sufficient filling with welded gaps, cause thin
Ratio of brazing area between wall pieces and matching piece does not reach requirement.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of vacuum brazing method with thin-wall part structure, can
It is effectively ensured between thin-wall part and matching piece and connects, can guarantee that the preset paste solder in place outer end to be welded is sufficient filling between welding
Gap can guarantee that the ratio of brazing area between thin-wall part and matching piece reaches requirement.
To achieve the goals above, the present invention adopts the following technical scheme: a kind of vacuum brazing side with thin-wall part structure
Method includes the following steps:
Step 1: preweld cleaning
Thin-wall part and matching piece are cleaned first with acetone, remove surface grease, alcohol is recycled to remove thin-wall part
And the impurity on matching piece surface, finally the surface of thin-wall part and matching piece is dried up using compressed air；
Step 2: component assembly positioning
Foil nickel-based solder is chosen, foil nickel-based solder is first fixed on to the surface to be welded of thin-wall part in the way of percussion spot welding
On, then according to the size of drawing requirement and position, the thin-wall part for presetting foil nickel-based solder is combined with matching piece
Assembly, and auxiliary positioning is carried out in the way of percussion spot welding；
Step 3: preset paste solder
Powder brazing alloy is chosen, powder brazing alloy is identical as the trade mark of foil nickel-based solder, first presses powder brazing alloy and binder
Ratio is mixed and made into paste, and paste solder is then preset at place outer end to be welded；
Step 4: clamping before welding
The assembly that thin-wall part is constituted with matching piece is placed into progress clamping in welding fixture to fix, in welding fixture
It is coated with only welding coat in advance on the working face of pedestal and pressing plate, only welding coat is used to prevent the solder to trickle when soldering from causing group
Unhelpful connection between fit and welding fixture；
Step 5: vacuum brazing
Assembly and welding fixture are fed together in vacuum drying oven, and complete soldering in a vacuum furnace.
Foil nickel-based solder with a thickness of 0.04~0.05mm, and foil nickel-based solder is cut into and thin-wall part surface to be welded
Size it is identical.
Thin-wall part and matching piece carry out the percussion spot welding parameter of auxiliary positioning are as follows: the number of rows of tack-weld is 1~2 row, weldering
Point spacing is 5~8mm, and weld indentation depth≤0.05mm, the process gap of thin-wall part and matching piece is during tack-weld
≤0.02mm。
The assembling process of assembly and welding fixture are as follows: assembly is placed on welding fixture first, in accordance with assembly relation
On pedestal working face, it is ensured that being supported between face and pedestal working face for assembly contacts well, then installs pressing plate, installation pressure
It is inserted into the guide post on pedestal in the mounting hole of pressing plate, while ensuring the assembly surface of pressing plate working face and pressed parts
Contact is good, is finally inserted into voussoir in the trapezoidal hole of guide post upper end, and apply pretightning force, and pressing plate is made to compress the to be welded of assembly
Position.
Only the ingredient of welding coat be zirconium dioxide or aluminum oxide, only welding coat with a thickness of 0.3~0.5mm.
Vacuum brazing parameter are as follows: vacuum pressure is≤4 × 10-2Pa, heating rate be 5~8 DEG C/min, brazing temperature according to
Brazing solder determines that holding time of brazing is 15~20min, carries out when assembly cools to 500 ± 10 DEG C with the furnace after soldering fast
Quickly cooling but, is cooled to 80 DEG C or less and comes out of the stove.
Beneficial effects of the present invention:
Vacuum brazing method with thin-wall part structure of the invention passes through foil nickel preset between thin-wall part and matching piece
Base solder, when soldering, can make solder full of entire welded gaps, to realize that high quality is brazed；Welding fixture has been used, has been eliminated
The deformation of thin-wall part and thus caused the problem of can not welding,；By on the pedestal of welding fixture and pressing plate working face
Spraying stops welding coat, and the solder that trickling not only can be effectively prevented causes unhelpful connection between assembly and welding fixture,
It eliminates tradition and brushes pollution of the stop-off gent to solder and vacuum drying oven, guarantee that brazing quality reliably, and only welding coat
Have the characteristics that high temperature resistant, fall off and reusable, the process for brushing stop-off gent due to eliminating tradition, and then improve
Working efficiency.
Detailed description of the invention
Fig. 1 is that the assembly of the stator labyrinth assembly with thin wall circular in embodiment one positions schematic diagram；
Fig. 2 is the soldering clamping schematic diagram of the stator labyrinth assembly with thin wall circular in embodiment one；
Fig. 3 is that the assembly of the outer ring block assembly with thin-walled wear plate in embodiment two positions schematic diagram；
Fig. 4 is the soldering clamping schematic diagram of the outer ring block assembly with thin-walled wear plate in embodiment two；
In figure, 1.1-annulus, 1.2-shells, 1.3-foil nickel-based solders (embodiment one), 1.4-paste solders are (in fact
Apply example one), 2.1-pedestals (embodiment one), 2.2-pressing plates (embodiment one), 2.3-guide posts (embodiment one), 2.4-voussoirs
(embodiment one), 2.5-only welding coat (embodiment one), 2.6-stator labyrinth assemblies, 2.7-hanging rings (embodiment one),
3.1-wear plates, 3.2-fan-shaped sections, 3.3-foil nickel-based solders (embodiment two), 3.4-paste solders (embodiment two),
4.1-pedestals (embodiment two), 4.2-pressing plates (embodiment two), 4.3-guide posts (embodiment two), 4.4-voussoir (embodiments
Two), 4.5-only welding coat (embodiment two), 4.6-outer ring block assemblies, 4.7-hanging rings (embodiment two), 4.8-handles.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment one:
In the present embodiment, thin-wall part is annulus 1.1, and matching piece is shell 1.2, the group being made of annulus 1.1 and shell 1.2
Zoarium is stator labyrinth assembly 2.6.Wherein, annulus 1.1 be high temperature alloy sheet metal component, sheet metal component with a thickness of 0.5mm, shell
1.2 be superalloy annular forging, and the trade mark of foil nickel-based solder and powder brazing alloy is B-Ni2.
A kind of vacuum brazing method with thin-wall part structure, includes the following steps:
Step 1: preweld cleaning
Annulus 1.1 and shell 1.2 are cleaned first with acetone, remove surface grease, alcohol is recycled to remove annulus
1.1 and 1.2 surface of shell impurity, finally using compressed air by the surface of annulus 1.1 and shell 1.2 dry up；
Step 2: component assembly positioning
Choose foil nickel-based solder, foil nickel-based solder with a thickness of 0.04mm, and by foil nickel-based solder be cut into
The size of 1.1 surface to be welded of annulus is identical；Foil nickel-based solder is first fixed on to the surface to be welded of annulus 1.1 in the way of percussion spot welding
On, then according to the size of drawing requirement and position, the annulus 1.1 for presetting foil nickel-based solder and shell 1.2 are subjected to group
It attaches together and matches, and carry out auxiliary positioning in the way of percussion spot welding；Wherein, annulus 1.1 and shell 1.2 carry out the energy storage of auxiliary positioning
Spot welding parameter are as follows: the number of rows of tack-weld is 2 rows, spot pitch 5mm, weld indentation depth≤0.05mm, tack-weld mistake
The process gap of annulus 1.1 and shell 1.2 is≤0.02mm in journey；And annulus 1.1 and shell 1.2 complete the shape after assembly positioning
State is as shown in Figure 1；
Step 3: preset paste solder
Powder brazing alloy is chosen, powder brazing alloy and binder are first mixed and made into paste in proportion, it is then that paste solder is pre-
It sets in place outer end to be welded as shown in Figure 1；
Step 4: clamping before welding
It is carried out as shown in Fig. 2, the stator labyrinth assembly 2.6 that annulus 1.1 is constituted with shell 1.2 is placed into welding fixture
Clamping is fixed, and is coated with only welding coat in advance on the pedestal of welding fixture and the working face of pressing plate, only the ingredient of welding coat is
Aluminum oxide, only welding coat with a thickness of 0.3mm, only welding coat is used to prevent the solder to trickle when soldering from stator being caused to obturage
Unhelpful connection between component 2.6 and welding fixture；Wherein, the assembling process of stator labyrinth assembly 2.6 and welding fixture are as follows: first
First stator labyrinth assembly 2.6 is placed on the pedestal working face of welding fixture according to assembly relation, it is ensured that stator labyrinth assembly
2.6 be supported between face and pedestal working face contacts well, then installs pressing plate, plugs in the guide post on pedestal when installing pressing plate
Enter in the mounting hole of pressing plate, while ensuring that pressing plate working face contacts well, most with 2.6 surface of stator labyrinth assembly of pressed parts
Voussoir is inserted into afterwards in the trapezoidal hole of guide post upper end, and applies pretightning force, pressing plate is made to compress the portion to be welded of stator labyrinth assembly 2.6
Position；
Step 5: vacuum brazing
Stator labyrinth assembly 2.6 and welding fixture are fed together in vacuum drying oven, and complete soldering in a vacuum furnace；Its
In, vacuum brazing parameter are as follows: vacuum pressure is≤4 × 10-2Pa, heating rate are 5 DEG C/min, and brazing temperature is 1040 DEG C, pricker
Weldering soaking time is 20min, is rapidly cooled when stator labyrinth assembly 2.6 cools to 500 DEG C with the furnace after soldering, is cooled to 80 DEG C
It comes out of the stove below.
Embodiment two:
In the present embodiment, thin-wall part is wear plate 3.1, and matching piece is fan-shaped section 3.2, by wear plate 3.1 and fan-shaped section 3.2
The assembly of composition is outer ring block assembly 4.6.Wherein, wear plate 3.1 be antifriction alloy product, wear plate 3.1 with a thickness of
0.8mm, fan-shaped section 3.2 are that stainless steel machine adds part, and the trade mark of foil nickel-based solder and powder brazing alloy is B-Ni2.
A kind of vacuum brazing method with thin-wall part structure, includes the following steps:
Step 1: preweld cleaning
Wear plate 3.1 and fan-shaped section 3.2 are cleaned first with acetone, remove surface grease, recycles alcohol removal
The impurity on 3.2 surface of wear plate 3.1 and fan-shaped section, is finally blown the surface of wear plate 3.1 and fan-shaped section 3.2 using compressed air
It is dry；
Step 2: component assembly positioning
Choose foil nickel-based solder, foil nickel-based solder with a thickness of 0.05mm, and by foil nickel-based solder be cut into
The size of 3.1 surface to be welded of wear plate is identical；First by foil nickel-based solder be fixed in the way of percussion spot welding wear plate 3.1 to
On the face of weld, then according to the size of drawing requirement and position, the wear plate 3.1 and fan-shaped section of foil nickel-based solder will be preset
3.2 being combined assembly, and auxiliary positioning is carried out in the way of percussion spot welding；Wherein, wear plate 3.1 and fan-shaped section 3.2 carry out
The percussion spot welding parameter of auxiliary positioning are as follows: the number of rows of tack-weld be 2 rows, spot pitch 6mm, weld indentation depth≤
0.05mm, wear plate 3.1 and the process gap of fan-shaped section 3.2 are≤0.02mm during tack-weld；And wear plate 3.1 and fan
The state that shape section 3.2 is completed after assembly positioning is as shown in Figure 3；
Step 3: preset paste solder
Powder brazing alloy is chosen, powder brazing alloy and binder are first mixed and made into paste in proportion, it is then that paste solder is pre-
It sets in place outer end to be welded as shown in Figure 3；
Step 4: clamping before welding
As shown in figure 4, the outer ring block assembly 4.6 that wear plate 3.1 and fan-shaped section 3.2 are constituted be placed into welding fixture into
Luggage is clamping fixed, is coated with only welding coat in advance on the pedestal of welding fixture and the working face of pressing plate, only the ingredient of welding coat
For zirconium dioxide, only welding coat with a thickness of 0.5mm, only welding coat is used to prevent the solder to trickle when soldering from causing outer ring block group
Unhelpful connection between part 4.6 and welding fixture；Wherein, the assembling process of outer ring block assembly 4.6 and welding fixture are as follows: press first
Outer ring block assembly 4.6 is placed on the pedestal working face of welding fixture according to assembly relation, it is ensured that outer ring block assembly 4.6 is propped up
It is contacted between support face and pedestal working face well, then pressing plate is installed, the guide post on pedestal is made to be inserted into pressing plate when pressing plate is installed
In mounting hole, while ensuring that pressing plate working face contacts well with 4.6 surface of outer ring block assembly of pressed parts, finally inserts voussoir
In the trapezoidal hole for entering guide post upper end, and apply pretightning force, pressing plate is made to compress the position to be welded of outer ring block assembly 4.6；
Step 5: vacuum brazing
Outer ring block assembly 4.6 and welding fixture are fed together in vacuum drying oven, and complete soldering in a vacuum furnace；Wherein,
Vacuum brazing parameter are as follows: vacuum pressure is≤4 × 10-2Pa, heating rate are 8 DEG C/min, and brazing temperature is 1050 DEG C, and soldering is protected
The warm time is 15min, is rapidly cooled when outer ring block assembly cools to 500 DEG C with the furnace after soldering, is cooled to 80 DEG C or less and comes out of the stove.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (6)
1. a kind of vacuum brazing method with thin-wall part structure, it is characterised in that include the following steps:
Step 1: preweld cleaning
Thin-wall part and matching piece are cleaned first with acetone, remove surface grease, recycle alcohol removal thin-wall part and is matched
The impurity of member surface is finally dried up the surface of thin-wall part and matching piece using compressed air；
Step 2: component assembly positioning
Foil nickel-based solder is chosen, is first fixed on foil nickel-based solder in the way of percussion spot welding on the surface to be welded of thin-wall part,
Then according to the size of drawing requirement and position, the thin-wall part for presetting foil nickel-based solder and matching piece are combined dress
Match, and carries out auxiliary positioning in the way of percussion spot welding；
Step 3: preset paste solder
Powder brazing alloy is chosen, powder brazing alloy is identical as the trade mark of foil nickel-based solder, in proportion by powder brazing alloy and binder first
It is mixed and made into paste, paste solder is then preset at place outer end to be welded；
Step 4: clamping before welding
The assembly that thin-wall part is constituted with matching piece is placed into progress clamping in welding fixture to fix, in the pedestal of welding fixture
And only welding coat is coated on the working face of pressing plate in advance, only welding coat is used to prevent the solder to trickle when soldering from causing assembly
Unhelpful connection between welding fixture；
Step 5: vacuum brazing
Assembly and welding fixture are fed together in vacuum drying oven, and complete soldering in a vacuum furnace.
2. a kind of vacuum brazing method with thin-wall part structure according to claim 1, it is characterised in that: the Ni-based pricker of foil
Material with a thickness of 0.04~0.05mm, and foil nickel-based solder is cut into identical as the size of thin-wall part surface to be welded.
3. a kind of vacuum brazing method with thin-wall part structure according to claim 1, it is characterised in that: thin-wall part with match
The percussion spot welding parameter of component progress auxiliary positioning are as follows: the number of rows of tack-weld is 1~2 row, and spot pitch is 5~8mm, solder joint
Depth of cup≤0.05mm, the process gap of thin-wall part and matching piece is≤0.02mm during tack-weld.
4. a kind of vacuum brazing method with thin-wall part structure according to claim 1, it is characterised in that: assembly and weldering
The assembling process of welding fixture are as follows: assembly is placed on the pedestal working face of welding fixture first, in accordance with assembly relation, it is ensured that
Being supported between face and pedestal working face for assembly contacts well, then installs pressing plate, makes leading on pedestal when installing pressing plate
Column is inserted into the mounting hole of pressing plate, while ensuring that pressing plate working face contacts well with the assembly surface of pressed parts, finally will
Voussoir is inserted into the trapezoidal hole of guide post upper end, and applies pretightning force, and pressing plate is made to compress the position to be welded of assembly.
5. a kind of vacuum brazing method with thin-wall part structure according to claim 1, it is characterised in that: stop welding coat
Ingredient be zirconium dioxide or aluminum oxide, only welding coat with a thickness of 0.3~0.5mm.
6. a kind of vacuum brazing method with thin-wall part structure according to claim 1, it is characterised in that: vacuum brazing ginseng
Number are as follows: vacuum pressure is≤4 × 10-2Pa, heating rate are 5~8 DEG C/min, and brazing temperature is determined according to brazing solder, soldering
Soaking time be 15~20min, be rapidly cooled when assembly cools to 500 ± 10 DEG C with the furnace after soldering, be cooled to 80 DEG C with
Under come out of the stove.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111112770A (en) * | 2019-12-27 | 2020-05-08 | 成立航空技术有限公司 | Brazing filler metal adding and welding method for nozzle assembly |
| CN111299739A (en) * | 2019-12-20 | 2020-06-19 | 楼蓝科技(江苏)有限公司 | Vacuum brazing process suitable for closed cavity multi-weld structure |
| CN113414461A (en) * | 2021-08-23 | 2021-09-21 | 西安远航真空钎焊技术有限公司 | Brazing method of core body switching section assembly |
| CN113579389A (en) * | 2021-06-21 | 2021-11-02 | 徐州徐工施维英机械有限公司 | Vacuum brazing method for dissimilar metals of concrete machinery |
| CN113751966A (en) * | 2021-08-25 | 2021-12-07 | 西安远航真空钎焊技术有限公司 | Thin-wall part runner forming method based on vacuum brazing |
| CN113878189A (en) * | 2021-09-09 | 2022-01-04 | 中国航发南方工业有限公司 | Vacuum brazing process for honeycomb assembly of aircraft engine |
| CN113878197A (en) * | 2021-11-10 | 2022-01-04 | 中国航发南方工业有限公司 | Swirler vacuum brazing clamp and swirler vacuum brazing method |
| CN114669818A (en) * | 2022-04-22 | 2022-06-28 | 江西制氧机有限公司 | Low-temperature cold shield thin-wall aluminum alloy conduit structure and vacuum brazing process and application thereof |
| CN115446406A (en) * | 2022-09-29 | 2022-12-09 | 中国航发动力股份有限公司 | Processing method of vacuum brazing heat shield assembly and fixture tool thereof |
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|---|---|---|---|---|
| CN111299739A (en) * | 2019-12-20 | 2020-06-19 | 楼蓝科技(江苏)有限公司 | Vacuum brazing process suitable for closed cavity multi-weld structure |
| CN111112770A (en) * | 2019-12-27 | 2020-05-08 | 成立航空技术有限公司 | Brazing filler metal adding and welding method for nozzle assembly |
| CN113579389A (en) * | 2021-06-21 | 2021-11-02 | 徐州徐工施维英机械有限公司 | Vacuum brazing method for dissimilar metals of concrete machinery |
| CN113414461A (en) * | 2021-08-23 | 2021-09-21 | 西安远航真空钎焊技术有限公司 | Brazing method of core body switching section assembly |
| CN113751966A (en) * | 2021-08-25 | 2021-12-07 | 西安远航真空钎焊技术有限公司 | Thin-wall part runner forming method based on vacuum brazing |
| CN113878189A (en) * | 2021-09-09 | 2022-01-04 | 中国航发南方工业有限公司 | Vacuum brazing process for honeycomb assembly of aircraft engine |
| CN113878189B (en) * | 2021-09-09 | 2022-11-15 | 中国航发南方工业有限公司 | Vacuum brazing process for honeycomb assembly of aircraft engine |
| CN113878197A (en) * | 2021-11-10 | 2022-01-04 | 中国航发南方工业有限公司 | Swirler vacuum brazing clamp and swirler vacuum brazing method |
| CN113878197B (en) * | 2021-11-10 | 2022-12-09 | 中国航发南方工业有限公司 | Swirler vacuum brazing clamp and swirler vacuum brazing method |
| CN114669818A (en) * | 2022-04-22 | 2022-06-28 | 江西制氧机有限公司 | Low-temperature cold shield thin-wall aluminum alloy conduit structure and vacuum brazing process and application thereof |
| CN114669818B (en) * | 2022-04-22 | 2024-01-30 | 江西制氧机有限公司 | Low-temperature cold screen thin-wall aluminum alloy conduit structure and vacuum brazing process and application thereof |
| CN115446406A (en) * | 2022-09-29 | 2022-12-09 | 中国航发动力股份有限公司 | Processing method of vacuum brazing heat shield assembly and fixture tool thereof |
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