CN115740730A - Method for reducing cooling deformation of cavity part in split diffusion welding - Google Patents
Method for reducing cooling deformation of cavity part in split diffusion welding Download PDFInfo
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Abstract
The invention relates to a method for reducing cooling deformation of cavity parts in split diffusion welding, which comprises the steps of preparing a part to be welded; pretreating a part to be welded; coating a solder stop agent; assembling a module: aligning and fitting the two pieces to be welded up and down, positioning and completing assembly, wherein the total height of the assembled pieces to be welded is H2, placing the assembled pieces to be welded at the central position of the lower template, and placing limiting blocks at two sides of the pieces to be welded between the upper template and the lower template; the height of the limiting block is H1, and H2-H1 is more than or equal to 0.4mm and less than or equal to 1.0mm; aligning the upper template with the lower template, enabling the surface sprayed with the solder stop agent to face towards a piece to be welded, and placing the piece to be welded on the piece to be welded to complete assembly of a group of modules; diffusion welding; when the heat preservation of the diffusion welding is finished, keeping the vacuum state, and adjusting the axial pressurizing pressure to 0.5-2.0 MPa until the cooling is finished; and (5) measuring after welding. The invention provides a usable reference plane for processing the appearance after welding, realizes direct processing by one-time clamping and alignment, and creates favorable conditions for improving efficiency and reducing cost for batch production of cavity structural members.
Description
Technical Field
The invention belongs to the technical field of manufacturing of aeroengine blades, and particularly relates to a method for reducing cooling deformation of cavity parts in split diffusion welding.
Background
With the increasing demand for high-performance engines in aerospace, weight reduction and efficiency improvement become one of the core targets of aircraft design, and cavity structural members are undoubtedly good choices. The cavity structural member generally comprises a solid frame, a cavity outer wall and studs, and compared with a solid structural member, the cavity structural member has the advantages of weight reduction, oil consumption reduction, efficiency improvement and the like while ensuring the structural rigidity and strength; by combining with the topological optimization design technology of the cavity structure, the cavity structural member can also have the functions of vibration reduction, noise reduction and integration, such as heat insulation, cooling air transmission or gas heating, fuel oil transmission and the like. Diffusion welding is the preferred method for manufacturing cavity structural members because of the advantages of no melting of base materials, strength of joints equal to or close to that of the base materials and the like in the welding process.
At present, the diffusion welding manufacturing process of the cavity structural member mainly comprises split diffusion welding and multilayer plate superplastic forming/diffusion bonding (SPF/DB), compared with the SPF/DB process, the split diffusion welding process has obvious application advantages, becomes a preferred process of the cavity structural member, and typically applies a titanium alloy material of a split air inlet support plate (also called a rectification support plate, a split support plate and a rectification blade) of an aircraft engine, a hollow adjustable blade, a control surface, a wall plate and the like.
The split diffusion welding process route of the cavity structural part is generally as follows: preparing a single piece of a to-be-welded part with a cavity and a vertical rib, pretreating the to-be-welded part, coating a welding stopping agent, assembling the to-be-welded part and a die, diffusion welding, measuring after welding, and processing the appearance after welding.
In the diffusion welding production of the titanium alloy split air inlet support plate and the hollow adjustable blade, in order to control the diffusion welding deformation of parts, the diffusion welding process is characterized in that the heating rate is reduced, the temperature equalizing section is increased, the heat preservation time of the temperature equalizing section is prolonged, a furnace cooling (namely vacuum cooling) mode is adopted during cooling, but the parts still have uneven height after welding, flexural deformation and local bulging deformation after diffusion welding, as shown in figures 1-3, wherein the height deviation can be more than or equal to 0.1mm, the flatness and parallelism deviation are more than or equal to 0.20mm, and the local bulging is more random.
Meanwhile, a limiting block during diffusion welding of the part is made of graphite materials, the linear expansion coefficient of graphite is far lower than that of titanium alloy, the linear expansion coefficient of graphite is small along with temperature change, when an upper die plate of a die and the limiting block form die assembly during diffusion welding and enter a cooling stage after diffusion welding, along with the reduction of the temperature in the furnace, cooling shrinkage generated by the graphite materials is far smaller than that of the part, so that the part and the upper die plate of the die are demolded, the part is freely cooled in an unconstrained state, uneven cooling deformation is generated, and uneven height, bending deformation and local bulging deformation are generated after diffusion welding.
In order to ensure the consistency of the final shape and the wall thickness of the part, the shape processing after welding has to adopt a processing method of alternating ultrasonic thickness measurement and shape processing, namely, after the wall thickness is measured by ultrasonic waves, the part is clamped again, the processing program is adjusted according to the measurement result, the wall thickness is measured again after the processing is finished to a certain stage, and the wall thickness and the shape can be ensured to meet the design requirements by repeated operation of three to seven times. Repeated clamping, measurement and program adjustment work many times has not only increased the cost of labor, has reduced production efficiency, and can't be applicable to mass production or automated production.
Regarding to many patents and documents about split diffusion welding, chinese patent (publication number: CN102825427A, publication date: 12/19/2012) provides an aircraft rudder component split diffusion welding method, chinese patent (publication number: CN106041293A, publication date: 2016/10/26/2016) provides a titanium alloy rudder wing part vacuum diffusion welding device and method, chinese patent (publication number: CN109955042A, publication date: 2019/07/02/201) provides a titanium alloy hollow structure preparation method, and Chinese patent (publication number: CN110508891A, publication date: 2019/11/29/2019) provides a titanium alloy closed ribbed hollow structure forming method. None of the above patents provide a diffusion weld cooling deformation control method.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for reducing cooling deformation of cavity parts in split diffusion welding, which realizes shape-following cooling and deformation constraint of cavity structural parts after split diffusion welding through material selection and design of a limiting block and pressure optimization in the cooling process of diffusion welding, reduces uneven height, bending deformation and local bulging deformation after welding, improves the planeness and parallelism precision of the external surface of the part, and provides a high-precision reference plane for the external shape processing after welding, thereby improving the shape processing efficiency, reducing the cost and shortening the processing period.
A method for reducing cooling deformation of a cavity part in split diffusion welding specifically comprises the following steps:
the method comprises the following steps: preparing a to-be-welded part:
preparing a single piece with a prefabricated inner cavity and a stud, checking the structural integrity of the stud, and keeping the edge of a to-be-welded surface sharp without loss;
step two: pretreating a part to be welded;
step three: coating of a solder resist:
spraying boron nitride anti-welding agent on the surfaces of the upper template and the lower template, which are contacted with the workpiece to be welded, and placing and airing;
step four: assembling a module:
aligning and fitting the two pieces to be welded up and down, positioning and completing assembly, wherein the total height of the assembled pieces to be welded is H2, placing the assembled pieces to be welded at the central position of the lower template, and placing limiting blocks at two sides of the pieces to be welded between the upper template and the lower template; the height of the limiting block is H1, and H2-H1 is more than or equal to 0.4mm and less than or equal to 1.0mm; aligning the upper template with the lower template, enabling the surface sprayed with the solder stop agent to face towards a piece to be welded, and placing the piece to be welded on the piece to be welded to complete assembly of a group of modules;
step five: diffusion welding:
placing the assembled modules in an axial pressurization vacuum diffusion welding furnace, and performing diffusion welding by adopting the conventional diffusion welding process; when the heat preservation of the diffusion welding is finished, the vacuum state is kept, and the axial pressurizing pressure is adjusted to 0.5MPa-2.0MPa until the cooling is finished;
step six: and (3) measuring after welding:
after diffusion welding, the height of the part is measured by a micrometer, and the flatness and the parallelism of the part are detected by a three-coordinate machine.
In the first step, when the to-be-welded surface of the to-be-welded part is a plane, the roughness Ra of the to-be-welded surface is less than or equal to 0.8 mu m, the planeness of the outer surface and the to-be-welded surface is less than or equal to 0.03mm, and the parallelism between the two planes is less than or equal to 0.05mm; when the to-be-welded surface of the to-be-welded part is a curved surface, the roughness Ra of the to-be-welded surface is less than or equal to 0.8 mu m, the planeness of the outer surface is less than or equal to 0.03mm, and the profile of the to-be-welded curved surface is less than or equal to 0.03mm.
The pretreatment method in the second step is to carry out pretreatment on the surface to be welded by acid washing or polishing to remove residual oxides and heterogeneous particle adhesion on the surface; cleaning the workpiece to be welded by using deionized water, absolute ethyl alcohol or acetone as a cleaning medium and adopting ultrasonic waves; after cleaning, the surface of the surface to be welded is checked to have no water stain, scratch or scratch.
And the limiting block in the fourth step is made of steel or high-temperature alloy.
The invention has the beneficial effects that: the invention provides a method for reducing cooling deformation of cavity parts in split diffusion welding, which realizes conformal cooling and deformation constraint of the cavity parts after split diffusion welding, reduces uneven height, flexural deformation and local bulging deformation of the parts after welding, reduces the deviation of the flatness and parallelism of the appearance to be less than 0.05mm, provides a usable reference plane for appearance processing after welding, realizes one-time clamping and alignment direct processing, and creates favorable conditions for improving efficiency and reducing cost of mass production of cavity structural members.
Drawings
FIG. 1 is a schematic diagram illustrating longitudinal deflection of a hollow cavity part after diffusion welding in the prior art;
FIG. 2 is a schematic view of a prior art hollow cavity part with a partially transverse cross-section bulging after diffusion welding;
FIG. 3 is a schematic diagram of the transverse deflection of a hollow cavity part after diffusion welding in the prior art;
FIG. 4 is a schematic view of clamping during diffusion welding of parts by the method provided by the invention;
wherein, the first and the second end of the pipe are connected with each other,
1-an upper template, 2-a lower template, 3-a limiting block and 4-a part to be welded.
Detailed Description
For better understanding of the present invention, the technical solutions and effects of the present invention will be described in detail by the embodiments with reference to the accompanying drawings.
A method for reducing cooling deformation of cavity parts in split diffusion welding specifically comprises the following steps:
example 1
The method comprises the following steps: preparation of the part to be welded 4
In the embodiment, the titanium alloy split structure air inlet support plate is subjected to diffusion welding, and the to-be-welded part 4 is a single half-blank of the two titanium alloy split structure air inlet support plates. Preparing a single piece with a prefabricated inner cavity and a stud, checking the structural integrity of the stud, keeping the edge of a surface to be welded sharp and free from loss, wherein the roughness Ra of the surface to be welded is less than or equal to 0.8 mu m, the planeness of the outer surface and the surface to be welded is less than or equal to 0.03mm, and the parallelism between the two planes is less than or equal to 0.05mm.
Step two: pretreatment of the parts to be welded 4
The method comprises the following steps of (1) pretreating a surface to be welded by adopting acid washing to remove residual oxides and heterogeneous particle attachments on the surface; cleaning a to-be-welded part 4 by using deionized water as a cleaning medium and adopting ultrasonic waves; after cleaning, the surface of the surface to be welded is checked to have no water stain, scratch or scratch.
Step three: solder stop coating
And spraying boron nitride solder stop agent on the surfaces of the upper template 1 and the lower template 2 which are in contact with the to-be-welded part 4, and placing and airing.
Step four: module assembly
And aligning and jointing the two pieces to be welded 4 up and down, and positioning to complete assembly, wherein the total height of the assembled pieces to be welded 4 in the embodiment is H2=16 +/-0.02 mm. Placing the assembled to-be-welded piece 4 in the center of the lower template 2, placing K3 alloy limiting blocks 3 on two sides of the to-be-welded piece 4, and placing the limiting blocks 3 between the upper template 1 and the lower template 2; the height of the limiting block 3 is H1, and H2-H1=0.60mm in the embodiment. Aligning the upper template 1 with the lower template 2, placing the surface sprayed with the flux stopping agent facing the to-be-welded part 4 on the to-be-welded part 4, and completing assembly of a group of modules, as shown in fig. 4.
Step five: diffusion welding
The assembled modules are placed in an axial pressurizing vacuum diffusion welding furnace, 3 groups of modules are placed in one layer, 3 layers are placed in total, and the diffusion welding is carried out by adopting the conventional diffusion welding process. And when the heat preservation of the diffusion welding is finished, keeping the vacuum state, and adjusting the axial pressurizing pressure to be 0.5MPa until the cooling is finished.
Step six: post-weld measurement
After diffusion welding, the height of the part is measured by a micrometer, and the planeness and parallelism of the part are detected by a three-coordinate measuring machine. In the embodiment, the height deviation of the welded parts is less than or equal to 0.03mm, and the flatness and the parallelism are less than or equal to 0.04mm.
Example 2
The method comprises the following steps: preparation of the part to be welded 4
In this embodiment, diffusion welding is performed on the hollow adjustable blade with the titanium alloy split structure, and the to-be-welded part 4 is a single piece of the hollow adjustable blade with the titanium alloy split structure. Preparing a single piece with a prefabricated inner cavity and a stud, checking the structural integrity of the stud, keeping the edge of a surface to be welded sharp and free from loss, wherein the roughness Ra of the surface to be welded is less than or equal to 0.8 mu m, the planeness of the outer surface is less than or equal to 0.03mm, and the profile of the curved surface to be welded is less than or equal to 0.03mm.
Step two: pretreatment of the parts to be welded 4
Polishing the surface to be welded for pretreatment, and removing residual oxides and heterogeneous particle adhesion on the surface; washing the to-be-welded part 4 by using absolute ethyl alcohol as a cleaning medium; and after cleaning, checking that the surface of the surface to be welded has no water stain, scratch or scratch.
Step three: solder stop coating
And spraying boron nitride anti-welding agent on the surfaces of the upper template 1 and the lower template 2, which are in contact with the workpiece 4 to be welded, and placing and drying the boron nitride anti-welding agent.
Step four: module assembly
And aligning and jointing the two pieces to be welded 4 up and down, and positioning to complete assembly, wherein the total height of the assembled pieces to be welded 4 in the embodiment is H2=35 +/-0.02 mm. Placing the assembled to-be-welded piece 4 in the middle of the lower template 2, placing 304 stainless steel limiting blocks 3 on two sides of the to-be-welded piece 4, and placing the limiting blocks 3 between the upper template 1 and the lower template 2; the height of stopper 3 is H1, and H2-H1=0.90mm in this embodiment. Aligning the upper template 1 with the lower template 2, enabling the surface sprayed with the solder stop agent to face to the to-be-welded part 4, and placing the to-be-welded part 4 on the to-be-welded part 4 to finish the assembly of a group of modules.
Step five: diffusion welding
And placing a plurality of groups of assembled modules in an axial pressurization vacuum diffusion welding furnace, wherein 3 groups of modules are placed in one layer and 2 layers are placed in total in the embodiment, and performing diffusion welding by adopting the conventional diffusion welding process. And when the heat preservation of the diffusion welding is finished, keeping the vacuum state, and adjusting the axial pressurizing pressure to be 2.0MPa until the cooling is finished.
Step six: post-weld measurement
After diffusion welding, the height of the part is measured by a micrometer, and the flatness and the parallelism of the part are detected by a three-coordinate machine. In the embodiment, the height deviation of the welded parts is less than or equal to 0.03mm, and the flatness and the parallelism are less than or equal to 0.03mm.
Example 3
The method comprises the following steps: preparation of the part to be welded 4
In this embodiment, diffusion welding is performed on the titanium alloy split structure air inlet support plate, and the to-be-welded part 4 is a single part of the titanium alloy split structure air inlet support plate. Preparing a single piece with a prefabricated inner cavity and a stud, checking the structural integrity of the stud, keeping the edge of a surface to be welded sharp and free from loss, wherein the roughness Ra of the surface to be welded is less than or equal to 0.8 mu m, the planeness of the outer surface and the surface to be welded is less than or equal to 0.03mm, and the parallelism between the two planes is less than or equal to 0.05mm.
Step two: pretreatment of the parts to be welded 4
The surface to be welded is pretreated by acid washing to remove residual oxides, heterogeneous particle adhesion and the like on the surface; wiping the to-be-welded part 4 by using acetone as a cleaning medium; after cleaning, the surface of the surface to be welded is checked to have no water stain, scratch or scratch, etc.
Step three: solder stop coating
And spraying boron nitride anti-welding agent on the surfaces of the upper template 1 and the lower template 2, which are in contact with the workpiece 4 to be welded, and placing and drying the boron nitride anti-welding agent.
Step four: module assembly
And aligning and jointing the two pieces to be welded 4 up and down, and positioning to complete assembly, wherein the total height of the assembled pieces to be welded 4 is H2=16 +/-0.02 mm in the embodiment. Placing the assembled to-be-welded piece 4 in the middle of the lower template 2, placing K3 alloy limiting blocks 3 on two sides of the to-be-welded piece 4, and placing the limiting blocks 3 between the upper template 1 and the lower template 2; the height of the limiting block 3 is H1, and H2-H1=0.40mm in the embodiment. Aligning the upper template 1 with the lower template 2, placing the surface sprayed with the flux stopping agent facing the to-be-welded part 4 on the to-be-welded part 4, and completing assembly of a group of modules, as shown in fig. 4.
Step five: diffusion welding
The assembled modules are placed in an axial pressurizing vacuum diffusion welding furnace, 3 groups of modules are placed in one layer, 3 layers are placed in total, and the diffusion welding is carried out by adopting the conventional diffusion welding process. And when the heat preservation of the diffusion welding is finished, keeping the vacuum state, and adjusting the axial pressurizing pressure to 1.0MPa until the cooling is finished.
Step six: post-weld measurement
After diffusion welding, the height of the part is measured by a micrometer, and the planeness and parallelism of the part are detected by a three-coordinate measuring machine. In the embodiment, the height deviation of the welded parts is less than or equal to 0.03mm, and the flatness and the parallelism are less than or equal to 0.03mm.
To highlight the effect produced by the present invention, a comparative example is provided below:
comparative example 1
The method comprises the following steps: preparation of the part to be welded 4
In this embodiment, diffusion welding is performed on the air inlet support plate with the titanium alloy split structure, and the to-be-welded part 4 is a single part of the air inlet support plate with the titanium alloy split structure. Preparing a single piece with a prefabricated inner cavity and a stud, checking the structural integrity of the stud, keeping the edge of a surface to be welded sharp and free from loss, wherein the roughness Ra of the surface to be welded is less than or equal to 0.8 mu m, the planeness of the outer surface and the surface to be welded is less than or equal to 0.03mm, and the parallelism between the two planes is less than or equal to 0.05mm.
Step two: pretreatment of the parts to be welded 4
The surface to be welded is pretreated by acid washing to remove residual oxides, heterogeneous particle adhesion and the like on the surface; ultrasonically cleaning a to-be-welded part 4 by using deionized water; after cleaning, the surface of the surface to be welded is checked to have no water stain, scratch or scratch, etc.
Step three: solder stop coating
And spraying boron nitride anti-welding agent on the surfaces of the upper template 1 and the lower template 2, which are in contact with the workpiece 4 to be welded, and placing and drying the boron nitride anti-welding agent.
Step four: module assembly
And aligning and jointing the two pieces to be welded 4 up and down, and positioning to complete assembly, wherein the total height of the assembled pieces to be welded 4 in the embodiment is H2=16 +/-0.02 mm. Placing the assembled to-be-welded piece 4 in the center of the lower template 2, placing graphite limiting blocks 3 on two sides of the to-be-welded piece 4, and placing the limiting blocks 3 between the upper template 1 and the lower template 2; the height of the limiting block 3 is H1, in the embodiment, H2-H1=0.35mm, the upper template 1 and the lower template 2 are aligned, the surface sprayed with the solder stopping agent faces the to-be-welded part 4, and the to-be-welded part 4 is placed on the to-be-welded part 4 to complete assembly of a module.
Step five: diffusion welding
The assembled modules are placed in an axial pressurizing vacuum diffusion welding furnace, 3 groups of modules are placed in one layer, 3 layers are placed in total, and the diffusion welding is carried out by adopting the conventional diffusion welding process. And when the heat preservation of the diffusion welding is finished, keeping the vacuum state, and adjusting the axial pressurizing pressure to be 0MPa till the cooling is finished.
Step six: post-weld measurement
After diffusion welding, the height of the part is measured by a micrometer, and the flatness and the parallelism of the part are detected by a three-coordinate machine. In the embodiment, the height deviation of the welded parts is more than or equal to 0.1mm, and the flatness and parallelism are more than or equal to 0.20mm.
When the die set is assembled, the limiting block 3 is placed between the upper die plate 1 and the lower die plate 2, the welding pressure during diffusion welding enables the to-be-welded piece 4 to generate compression deformation through the upper die plate 1, and finally the upper die plate 1 contacts the limiting block 3 to form die assembly.
The limiting block 3 is made of steel or high-temperature alloy, and compared with titanium alloy, the linear expansion coefficient of the steel or the high-temperature alloy is larger at the same temperature. When diffusion welding is carried out, the upper template 1 continuously moves downwards under the action of diffusion welding pressure to force the piece to be welded 4 to be subjected to compression deformation, finally the upper template 1 and the limiting block 3 form a die assembly, when the diffusion welding is carried out and the temperature in the furnace is continuously reduced when the cooling stage is finished, the limiting block 3 and the part are continuously cooled and shrunk, the limiting block 3 has a larger shrinkage rate and is always lower than the height of the part, so that the upper template 1 always keeps in contact with the part, and shape following movement and shape following constraint of the upper template 1 relative to the outer surface of the part are realized, and the purposes of reducing part flexural deformation and local bulging are achieved.
By using the known calculation method of the linear expansion coefficient of the steel or the high-temperature alloy material and the metal high-temperature expansion deformation, the height of the steel or the high-temperature alloy limiting block 3 at the diffusion welding temperature can be calculated by taking the conventional diffusion welding process and the diffusion welding compression deformation as input, and proper correction is carried out by combining with the verification of a diffusion welding test, so that the newly introduced steel or high-temperature alloy limiting block 3 can be well fused with the original diffusion welding process of the part, and the development and verification cost of a large amount of diffusion welding processes can be reduced.
Meanwhile, considering that the cooling deformation of the part appearance is limited only by the dead weight of the diffusion welding mould and the upper layer part, in order to further restrict the part deformation, after the heat preservation is finished, the axial pressurizing pressure of the equipment is adjusted to be 0.5-2.0 MPa, and the cooling is finished. In the cooling process, the heights of the part and the diffusion welding mould are continuously reduced along with the reduction of the temperature in the furnace, namely, the part and the diffusion welding mould are always in a separating state relative to the axial pressurizing pressure head, and the axial pressurizing pressure is required to be adjusted in real time to ensure that the pressure head is always in contact with the part and the diffusion welding mould. If a smaller axial pressurizing pressure is adopted, the axial pressurizing system of the vacuum diffusion welding furnace cannot be adjusted in time, so that the pressure cannot be applied in time, and once the pressurizing pressure head is separated, the situation that the pressurizing is impossible to pressurize again even occurs. Because the part, the diffusion welding die and the pressurizing pressure head are always in a state of being separated, the slightly larger axial pressurizing pressure can not further increase the compression deformation of the part; further tests show that when the axial pressurizing pressure of 0.5MPa-2.0MPa is adopted, the pressure is stably applied in the whole cooling process, and the part does not generate new compression deformation.
Therefore, the embodiment of the invention shows that the height deviation, the flatness and the parallelism of the diffusion-welded part are superior to the data of the comparative example, and the method for manufacturing the limiting block 3 by adopting steel or high-temperature alloy materials and applying the conformal axial pressurizing pressure in the cooling process realizes conformal cooling and deformation constraint of the cavity part after diffusion welding, reduces the deviation of the welded appearance flatness and the parallelism of the part to be less than 0.05mm, provides a usable reference plane for the welded appearance processing, realizes one-time clamping alignment and direct processing for the welded appearance processing, and creates favorable conditions for improving the efficiency and reducing the cost of the mass production of the cavity structural part.
Claims (4)
1. A method for reducing cooling deformation of cavity parts in split diffusion welding is characterized by comprising the following steps:
the method comprises the following steps: preparing a to-be-welded part:
preparing a single piece with a prefabricated inner cavity and a stud, checking the structural integrity of the stud, and keeping the edge of the surface to be welded to be sharp without loss;
step two: pretreating a part to be welded;
step three: coating of a solder resist:
spraying boron nitride solder stop agent on the surfaces of the upper template and the lower template which are in contact with the to-be-welded piece, and placing and airing;
step four: assembling a module:
vertically aligning and jointing two pieces to be welded, positioning and assembling the two pieces to be welded, wherein the total height of the assembled pieces to be welded is H2, placing the assembled pieces to be welded at the central position of a lower template, and placing limiting blocks at two sides of the pieces to be welded between the upper template and the lower template; the height of the limiting block is H1, and H2-H1 is more than or equal to 0.4mm and less than or equal to 1.0mm; aligning the upper template with the lower template, enabling the surface sprayed with the solder stop agent to face towards a piece to be welded, and placing the piece to be welded on the piece to be welded to complete assembly of a group of modules;
step five: diffusion welding:
placing the assembled modules in an axial pressurizing vacuum diffusion welding furnace, and performing diffusion welding by adopting the conventional diffusion welding process; when the heat preservation of the diffusion welding is finished, keeping the vacuum state, and adjusting the axial pressurizing pressure to 0.5-2.0 MPa until the cooling is finished;
step six: and (3) measuring after welding:
after diffusion welding, the height of the part is measured by a micrometer, and the flatness and the parallelism of the part are detected by a three-coordinate machine.
2. A method of reducing cooling distortion in diffusion butt welding of a cavity part as set forth in claim 1, wherein: in the first step, when the to-be-welded surface of the to-be-welded part is a plane, the roughness Ra of the to-be-welded surface is less than or equal to 0.8 mu m, the planeness of the outer surface and the to-be-welded surface is less than or equal to 0.03mm, and the parallelism between the two planes is less than or equal to 0.05mm; when the to-be-welded surface of the to-be-welded part is a curved surface, the roughness Ra of the to-be-welded surface is less than or equal to 0.8 mu m, the planeness of the outer surface is less than or equal to 0.03mm, and the profile of the to-be-welded curved surface is less than or equal to 0.03mm.
3. A method of reducing cooling distortion in diffusion butt welding of a cavity part as set forth in claim 1, wherein: the pretreatment method in the second step is to carry out pretreatment on the surface to be welded by acid washing or polishing to remove residual oxides and heterogeneous particle adhesion on the surface; cleaning the workpiece to be welded by using deionized water, absolute ethyl alcohol or acetone as a cleaning medium and adopting ultrasonic waves; and after cleaning, checking that the surface of the surface to be welded has no water stain, scratch or scratch.
4. A method of reducing cooling distortion in diffusion butt welding of a cavity part as set forth in claim 1, wherein: and the limiting block in the fourth step is made of steel or high-temperature alloy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116984726A (en) * | 2023-09-27 | 2023-11-03 | 中国航发沈阳黎明航空发动机有限责任公司 | Titanium alloy rectifying blade and limit control diffusion welding method for adjustable blade |
| CN117548999A (en) * | 2023-11-21 | 2024-02-13 | 华钛空天(北京)技术有限责任公司 | Diffusion welding method, device, equipment and medium for airfoil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116984726A (en) * | 2023-09-27 | 2023-11-03 | 中国航发沈阳黎明航空发动机有限责任公司 | Titanium alloy rectifying blade and limit control diffusion welding method for adjustable blade |
| CN117548999A (en) * | 2023-11-21 | 2024-02-13 | 华钛空天(北京)技术有限责任公司 | Diffusion welding method, device, equipment and medium for airfoil |
| CN117548999B (en) * | 2023-11-21 | 2024-05-03 | 华钛空天(北京)技术有限责任公司 | Diffusion welding method, device, equipment and medium for airfoil |
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