CN108015409B - diffusion welding method for fixing support plate with support plate head - Google Patents
diffusion welding method for fixing support plate with support plate head Download PDFInfo
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- CN108015409B CN108015409B CN201711248706.XA CN201711248706A CN108015409B CN 108015409 B CN108015409 B CN 108015409B CN 201711248706 A CN201711248706 A CN 201711248706A CN 108015409 B CN108015409 B CN 108015409B
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during welding
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
diffusion welding method for fixing support plate with support plate head, which comprises wire cutting of blank, grinding surface to be welded, assembling and positioning before welding, presetting compression supporting blocks to ensure compression, controlling corresponding welding parameters to perform diffusion welding, inspecting compression after welding, inspecting metallographic phase of weld seam, and completing diffusion welding of the fixing support plate with support plate head, wherein the welding qualification rate is more than 95%.
Description
The technical field is as follows:
the invention belongs to the technical field of aero-engines, and particularly relates to a diffusion welding method of fixed support plates with support plate heads.
Background art:
at present, most of fixing support plate components of an air inlet casing of an aero-engine are manufactured by adopting multilayer plate superplastic forming diffusion welding, a support plate and a support plate head are connected to through argon arc welding, but the problems of bulging and cracks at a triangular area of the fixing support plate component, welding deformation and the like easily occur on the support plate and the support plate head in the using process, and the overall quality is seriously influenced.
The invention content is as follows:
the invention aims to overcome the defects of the prior art, provides a method for diffusion welding of a fixed support plate with a support plate head, cancels a diffusion connection link between process laminates of the original superplastic forming diffusion welding fixed support plate, directly adopts a method combining machining and diffusion welding processes, mainly comprises the steps of machining the size of an inner cavity profile of the fixed support plate, positioning, diffusion welding and machining the size of an outer surface of the fixed support plate after welding, fundamentally solves the problems of bulging and cracking of a triangular area of the superplastic forming diffusion welding fixed support plate of a multilayer plate, simultaneously realizes that the support plate head and the fixed support plate are manufactured into an integral structure, and has the advantages of simple diffusion welding process of the fixed support plate with the support plate head, easy quality control, stable quality, better consistency of inner surface of the fixed support plate and higher size precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
A diffusion welding method for fixing a support plate with a support plate head comprises the following steps:
step 1, cutting a woolen yarn:
in order to ensure that the performance and the structure of the base metal are the same before welding, a forging blank is cut into two symmetrical pieces, and fixed support plate cavities with support plate heads are respectively processed;
in the step 1, after the forging blank is cut into two symmetrical pieces, ultrasonic inspection is carried out to ensure that no base metal defect exists.
In the step 1, a cavity is machined into a corresponding shape according to requirements, and the cavity is formed by polishing a groove.
Step 2, grinding the surface of the surface to be welded:
grinding the surface of a surface to be welded to form a fixed support plate with a support plate head after grinding, and ensuring that the parallelism of the surface to be welded after grinding is not more than 0.03mm and the roughness of the surface to be welded of the blade is not more than 0.6 um;
step 3, surface treatment of the surfaces to be welded:
(1) carrying out acid washing before welding on the fixed support plate with the support plate head after grinding;
(2) after acid cleaning, cleaning and drying the surface to be welded until no water stain exists on the surface to be welded;
in the step 3(2), the cleaning mode is as follows: and (3) carrying out ultrasonic cleaning by using deionized water, wherein the cleaning temperature is 60-80 ℃, and the cleaning time is 20-30 min.
Step 4, assembling and positioning before welding:
(1) checking the quality of the surface to be welded and the inside of the cavity to ensure that the surface of the surface to be welded and the inside of the cavity have no impurities;
(2) combining the surfaces to be welded of the cleaned upper and lower support plates, positioning after ensuring that the fit clearance of the surfaces to be welded is less than 0.03mm, and ensuring that the dislocation quantity of the upper and lower support plates is not more than 0.05mm to form a fixed support plate with a support plate head after qualified assembly;
in the step 4(2), positioning holes are arranged on the periphery of the upper support plate and the lower support plate as required, and when the upper support plate and the lower support plate are combined, positioning is carried out by penetrating the positioning holes through positioning pins, so that the dislocation quantity is not more than 0.05 mm.
Step 5, presetting a compression amount supporting block:
placing the qualified fixed support plate with the support plate head in the center of a platform in a diffusion welding furnace, and then placing a compression amount support block between the two support plates, wherein the compression amount between the two support plates is reserved for 0.27-0.33 mm;
in the step 5, the diffusion welding device is a vacuum diffusion welding furnace.
In the step 5, the compression amount supporting block is a graphite supporting block.
Step 6, diffusion welding:
(1) closing the diffusion welding furnace, vacuumizing to make the vacuum pressure in the device less than 1 x 10-4After mbar, heating to 500-550 ℃, and keeping the temperature for 20-60 min;
(2) heating to 650-700 ℃ again, and preserving heat for 40-60 min;
(3) heating to 800-850 ℃ again, and keeping the temperature for 40-60 min;
(4) raising the temperature to 900-950 ℃ again, pressurizing to 2-5 MPa, keeping the temperature for 90-120 min, cooling to below 800 ℃ along with the furnace, filling 1bar of high-purity argon, cooling to below 50 ℃, completing diffusion welding, and discharging the welded fixed support plate with the support plate head out of the furnace;
in the step 6(1), before the diffusion welding device is closed, a load thermocouple is prefabricated at the edge of the welding seam of the support plate and is used for monitoring temperature change in the device.
In the step 6(1), the temperature rise speed is 8-15 ℃/min.
In the step 6(2), the temperature rise rate is 5-10 ℃/min.
In the step 6(3), the temperature rise rate is 5-8 ℃/min.
In the step 6(4), the cooling mode is to use a fan for rapid cooling.
In the step 6(4), the temperature rise speed is 5-8 ℃/min.
And 7, checking the compression amount after welding:
detecting the compression amount and the flatness of the fixed support plate with the support plate head after welding, and ensuring that the compression amount is 0.27-0.33 mm and the flatness after welding is less than 0.10 mm;
step 8, metallographic inspection of the weld joint:
and cutting off the edge of the welded fixed support plate with the support plate head, and carrying out amplification inspection, wherein the welding qualification rate is more than 95%.
The invention has the beneficial effects that:
(1) the diffusion welding method for the fixed support plate with the support plate head has the advantages that the process flow of the multi-layer plate superplastic forming diffusion welding support plate is simple, the process uniformity is good, the diffusion welding quality is stable, the support plate head and the support plate are of an integral structure, the high-temperature tensile strength of a welding line is as strong as that of a base material, the high-temperature lasting strength reaches more than 95% of that of the base material, and the metallographic photograph of the welding line shows that the welding rate reaches more than 95%;
(2) the diffusion welding method for the fixing support plate with the support plate head is good in stability, the dimensional accuracy of the inner cavity and the outer profile of the assembly is high, meanwhile, the diffusion connection link between the traditional fixing support plate laminates is eliminated, the quality defect between diffusion connection layers of the fixing support plate main body is avoided, the defect of a diffusion connection triangular area of a multilayer board is overcome, the main structure of the fixing support plate is optimized, and the overall quality of a product is improved;
(3) the fixing support plate with the support plate head is of an integral structure, the split diffusion welding process is adopted, the argon arc welding connection process of the support plate and the support plate head in the follow-up air inlet casing component manufacturing process is omitted, the support plate welding deformation is reduced, and the technology is applied to the manufacturing field of fixing support plates and hollow blades of aero-engines.
Description of the drawings:
FIG. 1 is a schematic process flow diagram of a diffusion welding method for a fixed support plate with a support plate head according to the present application;
FIG. 2 is an OM image of a weld 20 times as large as a fixed support plate with a support plate head after diffusion welding in example 1 of the present application, where A is an original interface of the weld;
FIG. 3 is an OM image of a weld 40 times that of a fixed support plate with a support plate head after diffusion welding in the embodiment 1 of the present application;
FIG. 4 is an OM image of a 75-fold completed diffusion welded strip head anchor plate weld of example 1 of the present application.
The specific implementation mode is as follows:
the present invention is further illustrated in step by reference to the following examples.
The diffusion bonding oven used in the following examples was MOV653HP with a temperature error of 10 ℃.
Example 1
A diffusion welding method for fixing a support plate with a support plate head, wherein the welding process flow schematic diagram is shown in figure 1, and the method comprises the following steps:
step 1, cutting a woolen yarn:
in order to ensure that the performance and the organization of a base material before welding are the same, a forging blank is cut into two symmetrical pieces, ultrasonic inspection is carried out to ensure that no base material defect exists, fixed support plate cavities with support plate heads are respectively processed, the cavities are processed into corresponding shapes as required, and the cavities are formed by groove polishing;
step 2, grinding the surface of the surface to be welded:
grinding the surface of a surface to be welded to form a fixed support plate with a support plate head after grinding, and ensuring that the parallelism of the surface to be welded after grinding is not more than 0.03mm and the roughness of the surface to be welded of the blade is not more than 0.6 um;
step 3, surface treatment of the surfaces to be welded:
(1) carrying out acid washing before welding on the fixed support plate with the support plate head after grinding;
(2) after acid cleaning, cleaning and drying the surface to be welded, and carrying out ultrasonic cleaning by using deionized water at 60 ℃ for 30min until no water stain exists on the surface to be welded;
step 4, assembling and positioning before welding:
(1) checking the quality of the surface to be welded and the inside of the cavity to ensure that the surface of the surface to be welded and the inside of the cavity have no impurities;
(2) combining the surfaces to be welded of the cleaned upper and lower support plates, ensuring that the fit clearance of the surfaces to be welded is less than 0.03mm, arranging positioning holes on the peripheries of the upper and lower support plates as required, and positioning the upper and lower support plates by passing positioning pins through the positioning holes during combination to ensure that the dislocation quantity of the upper and lower support plates is not more than 0.05mm, thereby forming a qualified head fixed support plate with the support plates;
step 5, presetting a compression amount supporting block:
placing the qualified fixed support plate with the support plate head in the center of a platform in a vacuum diffusion welding furnace, and then placing a graphite support block between the two support plates, wherein the compression amount between the two support plates is reserved for 0.3 mm;
step 6, diffusion welding:
(1) prefabricating load thermocouple at the edge of the welding line of the support plate for monitoring the temperature change in the device, closing the diffusion welding furnace , vacuumizing to make the vacuum pressure in the furnace less than 1 x 10-4After mbar, heating to 550 ℃ at a heating rate of 10 ℃/min, and keeping the temperature for 40 min;
(2) heating to 700 deg.C again at a rate of 5 deg.C/min, and maintaining for 40 min;
(3) heating to 850 deg.C again at a rate of 5 deg.C/min, and maintaining for 40 min;
(4) raising the temperature to 920 ℃ again at the temperature raising speed of 5 ℃/min, pressurizing to 2.5MPa, keeping the temperature for 90min, cooling to below 800 ℃ along with the furnace, filling 1bar of high-purity argon, rapidly cooling to below 50 ℃ by adopting a fan, finishing diffusion welding, and discharging the welded fixed support plate with the support plate head out of the furnace;
and 7, checking the compression amount after welding:
detecting the compression amount and the flatness of the fixed support plate with the support plate head after welding, and ensuring that the compression amount is 0.30mm and the flatness after welding is less than 0.10 mm;
step 8, metallographic inspection of the weld joint:
and cutting off the edge of the welded fixed support plate with the support plate head, and carrying out magnification inspection, wherein an OM image under the welding seam by 20 times is shown in fig. 2, A is an original interface of the welding seam, an OM image under the welding seam by 40 times is shown in fig. 3, an OM image under the welding seam by 75 times is shown in fig. 4, and the welding qualification rate is more than 95%.
Example 2
A diffusion welding method for fixing a support plate with a support plate head, wherein the welding process flow schematic diagram is shown in figure 1, and the method comprises the following steps:
step 1, cutting a woolen yarn:
in order to ensure that the performance and the organization of a base material before welding are the same, a forging blank is cut into two symmetrical pieces, ultrasonic inspection is carried out to ensure that no base material defect exists, fixed support plate cavities with support plate heads are respectively processed, the cavities are processed into corresponding shapes as required, and the cavities are formed by groove polishing;
step 2, grinding the surface of the surface to be welded:
grinding the surface of a surface to be welded to form a fixed support plate with a support plate head after grinding, and ensuring that the parallelism of the surface to be welded after grinding is not more than 0.03mm and the roughness of the surface to be welded of the blade is not more than 0.6 um;
step 3, surface treatment of the surfaces to be welded:
(1) carrying out acid washing before welding on the fixed support plate with the support plate head after grinding;
(2) after acid cleaning, cleaning and drying the surface to be welded, and carrying out ultrasonic cleaning at 70 ℃ by using deionized water for 25min until no water stain exists on the surface to be welded;
step 4, assembling and positioning before welding:
(1) checking the quality of the surface to be welded and the inside of the cavity to ensure that the surface of the surface to be welded and the inside of the cavity have no impurities;
(2) combining the surfaces to be welded of the cleaned upper and lower support plates, ensuring that the fit clearance of the surfaces to be welded is less than 0.03mm, arranging positioning holes on the peripheries of the upper and lower support plates as required, and positioning the upper and lower support plates by passing positioning pins through the positioning holes during combination to ensure that the dislocation quantity of the upper and lower support plates is not more than 0.05mm, thereby forming a qualified head fixed support plate with the support plates;
step 5, presetting a compression amount supporting block:
placing the qualified fixed support plate with the support plate head in the center of a platform in a vacuum diffusion welding furnace, and then placing a graphite support block between the two support plates, wherein the compression amount between the two support plates is reserved for 0.27 mm;
step 6, diffusion welding:
(1) prefabricating load thermocouple at the edge of the welding line of the support plate for monitoring the temperature change in the device, closing the diffusion welding furnace and vacuumizing to ensure that the vacuum pressure in the device is less than 1 multiplied by 10-4After mbar, heating to 500 ℃ at a heating rate of 8 ℃/min, and keeping the temperature for 60 min;
(2) heating to 650 ℃ again at the heating rate of 8 ℃/min, and keeping the temperature for 60 min;
(3) heating to 800 deg.C again at a temperature rise rate of 6 deg.C/min, and maintaining for 60 min;
(4) raising the temperature to 900 ℃ again at the temperature raising speed of 6 ℃/min, pressurizing to 2MPa, keeping the temperature for 120min, cooling to below 800 ℃ along with the furnace, filling 1bar of high-purity argon, rapidly cooling to below 50 ℃ by adopting a fan, finishing diffusion welding, and discharging the welded fixed support plate with the support plate head;
and 7, checking the compression amount after welding:
detecting the compression amount and the flatness of the fixed support plate with the support plate head after welding, and ensuring that the compression amount is 0.27mm and the flatness after welding is less than 0.10 mm;
step 8, metallographic inspection of the weld joint:
and cutting off the edge of the welded fixed support plate with the support plate head, and carrying out amplification inspection, wherein the welding qualification rate is more than 95%.
Example 3
A diffusion welding method for fixing a support plate with a support plate head, wherein the welding process flow schematic diagram is shown in figure 1, and the method comprises the following steps:
step 1, cutting a woolen yarn:
in order to ensure that the performance and the organization of a base material before welding are the same, a forging blank is cut into two symmetrical pieces, ultrasonic inspection is carried out to ensure that no base material defect exists, fixed support plate cavities with support plate heads are respectively processed, the cavities are processed into corresponding shapes as required, and the cavities are formed by groove polishing;
step 2, grinding the surface of the surface to be welded:
grinding the surface of a surface to be welded to form a fixed support plate with a support plate head after grinding, and ensuring that the parallelism of the surface to be welded after grinding is not more than 0.03mm and the roughness of the surface to be welded of the blade is not more than 0.6 um;
step 3, surface treatment of the surfaces to be welded:
(1) carrying out acid washing before welding on the fixed support plate with the support plate head after grinding;
(2) after acid cleaning, cleaning and drying the surface to be welded, and carrying out ultrasonic cleaning by using deionized water at 80 ℃ for 20min until no water stain exists on the surface to be welded;
step 4, assembling and positioning before welding:
(1) checking the quality of the surface to be welded and the inside of the cavity to ensure that the surface of the surface to be welded and the inside of the cavity have no impurities;
(2) combining the surfaces to be welded of the cleaned upper and lower support plates, ensuring that the fit clearance of the surfaces to be welded is less than 0.03mm, arranging positioning holes on the peripheries of the upper and lower support plates as required, and positioning the upper and lower support plates by passing positioning pins through the positioning holes during combination to ensure that the dislocation quantity of the upper and lower support plates is not more than 0.05mm, thereby forming a qualified head fixed support plate with the support plates;
step 5, presetting a compression amount supporting block:
placing the qualified fixed support plate with the support plate head in the center of a platform in a vacuum diffusion welding furnace, and then placing a graphite support block between the two support plates, wherein the compression amount between the two support plates is reserved for 0.33 mm;
step 6, diffusion welding:
(1) prefabricating load thermocouple at the edge of the welding line of the support plate for monitoring the temperature change in the device, closing the diffusion welding furnace and vacuumizing to ensure that the vacuum pressure in the device is less than 1 multiplied by 10-4After mbar, heating to 520 ℃ at a heating rate of 15 ℃/min, and keeping the temperature for 20 min;
(2) heating to 680 deg.C again at a heating rate of 10 deg.C/min, and maintaining for 50 min;
(3) heating to 820 deg.C again at a temperature rise rate of 8 deg.C/min, and maintaining for 50 min;
(4) raising the temperature to 950 ℃ again at the temperature raising speed of 8 ℃/min, pressurizing to 5MPa, keeping the temperature for 100min, cooling to below 800 ℃ along with the furnace, filling 1bar of high-purity argon, rapidly cooling to below 50 ℃ by adopting a fan, finishing diffusion welding, and discharging the welded fixed support plate with the support plate head out of the furnace;
and 7, checking the compression amount after welding:
detecting the compression amount and the flatness of the fixed support plate with the support plate head after welding, and ensuring that the compression amount is 0.33mm and the flatness after welding is less than 0.10 mm;
step 8, metallographic inspection of the weld joint:
and cutting off the edge of the welded fixed support plate with the support plate head, and carrying out amplification inspection, wherein the welding qualification rate is more than 95%.
Claims (8)
1, diffusion welding method for fixing a support plate with a support plate head, which is characterized by comprising the following steps:
step 1, cutting a woolen yarn:
in order to ensure that the performance and the structure of the base metal are the same before welding, a forging blank is cut into two symmetrical pieces, and fixed support plate cavities with support plate heads are respectively processed;
step 2, grinding the surface of the surface to be welded:
grinding the surface of a surface to be welded to form a fixed support plate with a support plate head after grinding, and ensuring that the parallelism of the surface to be welded after grinding is not more than 0.03mm and the roughness of the surface to be welded of the blade is not more than 0.6 um;
step 3, surface treatment of the surfaces to be welded:
(1) carrying out acid washing before welding on the fixed support plate with the support plate head after grinding;
(2) after acid cleaning, cleaning and drying the surface to be welded until no water stain exists on the surface to be welded;
step 4, assembling and positioning before welding:
(1) checking the quality of the surface to be welded and the inside of the cavity to ensure that the surface of the surface to be welded and the inside of the cavity have no impurities;
(2) combining the surfaces to be welded of the cleaned upper and lower support plates, positioning after ensuring that the fit clearance of the surfaces to be welded is less than 0.03mm, and ensuring that the dislocation quantity of the upper and lower support plates is not more than 0.05mm to form a fixed support plate with a support plate head after qualified assembly;
step 5, presetting a compression amount supporting block:
placing the qualified fixed support plate with the support plate head in the center of a platform in a diffusion welding furnace, and then placing a compression amount support block between the two support plates, wherein the compression amount between the two support plates is reserved for 0.27-0.33 mm;
step 6, diffusion welding:
(1) closing the diffusion welding furnace , and vacuumizing to make the vacuum pressure in the device less than 1 × 10-4After mbar, heating to 500-550 ℃, and keeping the temperature for 20-60 min;
(2) heating to 650-700 ℃ again, and preserving heat for 40-60 min;
(3) heating to 800-850 ℃ again, and keeping the temperature for 40-60 min;
(4) raising the temperature to 900-950 ℃ again, pressurizing to 2-5 MPa, keeping the temperature for 90-120 min, cooling to below 800 ℃ along with the furnace, filling 1bar of high-purity argon, cooling to below 50 ℃, completing diffusion welding, and discharging the welded fixed support plate with the support plate head out of the furnace;
and 7, checking the compression amount after welding:
detecting the compression amount and the flatness of the fixed support plate with the support plate head after welding, and ensuring that the compression amount is 0.27-0.33 mm and the flatness after welding is less than 0.10 mm;
step 8, metallographic inspection of the weld joint:
and cutting off the edge of the welded fixed support plate with the support plate head, and carrying out amplification inspection, wherein the welding qualification rate is more than 95%.
2. The diffusion welding method of a fixed plate with a plate head as claimed in claim 1, wherein in said step 1, the forged blank is cut into two symmetrical pieces, and then ultrasonic inspection is performed to ensure that there are no defects in the base material.
3. The diffusion welding method of a fixed support plate with a support plate head as claimed in claim 1, wherein in step 1, a cavity is machined into a corresponding shape as required, and the cavity is formed by groove grinding.
4. The diffusion welding method of a fixed plate with a plate head as claimed in claim 1, wherein in step 3(2), the cleaning method is as follows: and (3) carrying out ultrasonic cleaning by using deionized water, wherein the cleaning temperature is 60-80 ℃, and the cleaning time is 20-30 min.
5. The diffusion welding method of a fixed support plate with a support plate head as claimed in claim 1, wherein in step 4(2), positioning holes are formed around the upper and lower support plates as required, and when the upper and lower support plates are combined, positioning is performed by passing positioning pins through the positioning holes, so that the dislocation amount is not more than 0.05 mm.
6. The diffusion bonding method of claim 1, wherein in step 5, the compression support block is a graphite support block.
7. The method of diffusion welding a stationary plate with a plate head as claimed in claim 1, wherein in step 6(1), load thermocouples are pre-fabricated at the edges of the plate weld for monitoring temperature changes in the apparatus prior to the furnace being closed.
8. The diffusion welding method for a fixed support plate with a support plate head as claimed in claim 1, wherein in the step 6(1), the temperature rise speed is 8-15 ℃/min; in the step 6(2), the temperature rise speed is 5-10 ℃/min; in the step 6(3), the temperature rise speed is 5-8 ℃/min; in the step 6(4), the temperature rise speed is 5-8 ℃/min.
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| CN110756980B (en) * | 2019-11-07 | 2020-12-18 | 西北工业大学 | Sectional diffusion welding method, application thereof and aero-engine hollow blade |
| CN112247334B (en) * | 2020-10-12 | 2022-06-03 | 中国航发沈阳黎明航空发动机有限责任公司 | Solid phase diffusion welding process for hollow part with complex curved surface welding interface |
| CN114235954A (en) * | 2021-12-15 | 2022-03-25 | 中国航发动力股份有限公司 | Ultrasonic detection method for hollow support plate diffusion welding head |
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| CN104384816A (en) * | 2014-10-21 | 2015-03-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Welding method for box type part of air intake machine |
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| CN101148000A (en) * | 2006-09-21 | 2008-03-26 | 航天材料及工艺研究所 | High temperature alloy complex groove structure panel and flange liquid phase diffusion connecting method |
| CN102886599A (en) * | 2012-10-12 | 2013-01-23 | 华中科技大学 | Method for manufacturing multi-layer amorphous alloy and crystal metal composite structure through diffusion welding |
| CN102990219A (en) * | 2012-11-14 | 2013-03-27 | 北京动力机械研究所 | Diffusion welding process method for combustion chamber structure member made of Ti2AlNb alloy |
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