CN115055885A - Welding tool for turbine stationary blade ring and welding method thereof - Google Patents

Welding tool for turbine stationary blade ring and welding method thereof Download PDF

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Publication number
CN115055885A
CN115055885A CN202210722556.6A CN202210722556A CN115055885A CN 115055885 A CN115055885 A CN 115055885A CN 202210722556 A CN202210722556 A CN 202210722556A CN 115055885 A CN115055885 A CN 115055885A
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CN
China
Prior art keywords
welding
stationary blade
blade ring
ring
pressing block
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210722556.6A
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Chinese (zh)
Inventor
王善林
戴忠奎
徐睦忠
赵军军
陈玉华
倪佳明
涂文斌
魏明炜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Barton Welding Technology Research Institute
Nanchang Hangkong University
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Zhejiang Barton Welding Technology Research Institute
Nanchang Hangkong University
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Application filed by Zhejiang Barton Welding Technology Research Institute, Nanchang Hangkong University filed Critical Zhejiang Barton Welding Technology Research Institute
Priority to CN202210722556.6A priority Critical patent/CN115055885A/en
Publication of CN115055885A publication Critical patent/CN115055885A/en
Pending legal-status Critical Current

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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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/0426—Fixtures for other work
    • B23K37/0435—Clamps
    • 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
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • 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
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups

Abstract

The invention discloses a welding tool for a turbine stationary blade ring and a welding method thereof, and S1, the surfaces to be welded of the stationary blades and the surrounding areas are processed; s2, clamping the stationary blade into a welding tool; s3, carrying out demagnetization treatment on the stationary blade ring and the welding tool; s4, wiping the surface to be welded by using non-woven fabric dipped with acetone or alcohol; s5, placing the stationary blade ring and the welding tool into a vacuum chamber, and welding the stationary blade ring by adopting small welding heat input; s6, welding the stationary blade ring by adopting preset welding parameters and a preset welding sequence; and S7, after welding, keeping the vacuum chamber environment for 10-20 min, and exhausting and taking out. The invention adopts the high-pressure high-vacuum electron beam welding technology to complete the welding of the turbine stationary blade ring according to the preset welding parameters, welding positions and sequence, and uses a special welding tool for clamping, thereby greatly reducing the deformation of the turbine stationary blade ring caused by the welding stress and leading the connection between the stationary blades to be more reliable, firm and stable.

Description

Welding tool for turbine stationary blade ring and welding method thereof
Technical Field
The invention belongs to the technical field of turbine stationary blade ring welding, and particularly relates to a welding tool for a turbine stationary blade ring and a welding method thereof.
Background
A turbocharger device is a forced induction system. They deliver air to the engine intake at a greater density than would be possible in a normal air-breathing configuration, allowing more fuel to be combusted, thus boosting the engine's horsepower without significantly increasing engine weight. The stator blade ring assembly is a common assembly in large-scale turbocharging equipment in the aviation or other fields, the stator blade ring is composed of individual stator blades, each stator blade comprises a blade root, a blade body and a blade shroud, the blade root and the blade shroud are respectively welded or integrally formed at two ends of the blade body, and finally, the stator blade ring is manufactured in different modes. Vane ring structures have found widespread use in many areas, such as in aircraft and automotive engines.
Currently, there are many methods for manufacturing the vane ring:
1. the axial flow compressor adopts mechanical connection, and the whole body can be composed of a shell and a stationary blade ring, wherein the shell can be divided into an upper shell and a lower shell, and the stationary blade ring can also be divided into a plurality of stationary blade segments in the circumferential direction. In the upper casing and the lower casing, vane ring grooves are formed which are recessed from the inside in the radial direction toward the outside in the radial direction and extend in the circumferential direction, and each of the vane segments is fitted to either one of the vane ring grooves of the upper casing or the lower casing.
2. Many aeroengine rectifier blades all work with fan-shaped section subassembly structural style, fan-shaped section subassembly is formed by a plurality of monomer blade built-up welding, the concrete operation mode is that the solder paste piece of welding the surface of treating of each monomer blade earlier, then utilize assembly jig to arrange each monomer blade and fix a position, reuse fixed position welding mode to connect each monomer blade as whole subassembly, the size of the blade side of quiet leaf ring can not process after welding, the deformation of part needs to be controlled in the welding process.
The existing brazing has the problems of low efficiency, poor quality and environmental pollution; the mechanical connection has the problems of unreliable, infirm and unstable connection, and the machining and assembling procedures are complex, and the requirement on the machining precision of the stator blade is high.
Disclosure of Invention
The present invention is directed to a welding tool for a turbine stationary blade ring and a welding method thereof, which solve or improve the above-mentioned problems.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the invention provides a welding tool for a turbine stationary blade ring, which comprises a chassis, a pressing block, a guide disc and an outer limit; the chassis is respectively connected with the pressing block, the guide disc and the outer limiting bolt;
the upper surface and the lower surface of the outer limit are provided with a first countersunk threaded hole, and the outer limit is used for limiting the outer ring of the stationary blade ring;
a plurality of large fan-shaped holes are uniformly distributed in the chassis, a small step hole is arranged between every two adjacent large fan-shaped holes, and the small step holes are connected with the pressing block;
a small circular boss is arranged on the chassis, and a plurality of second countersunk head threaded holes are uniformly distributed on the small circular boss; a large stepped hole matched with the second countersunk head threaded hole is formed in the guide disc; the guide disc is provided with a plurality of guide tracks for guiding the clamping claws; a disc thread is embedded in the small circular boss, and a plane thread matched with the clamping jaw is arranged on the disc thread; the plane thread drives the clamping jaw to move along the guide rail so as to clamp and loosen the fixed blade in the circumferential direction;
the compressing block is provided with a large circular boss for positioning and compressing the stationary blade; a plurality of small fan-shaped holes which are uniformly distributed are formed in the pressing block, a threaded hole is formed between every two adjacent small fan-shaped holes, and the threaded holes and the bolts are matched and used for connecting the pressing block and the chassis.
Furthermore, the pressing block is of a ring type and comprises an upper pressing block and a lower pressing block; go up compact heap and lower compact heap through the cooperation of second bolt and gland nut to compress tightly and fix a position on the vertical direction of quiet leaf ring.
Further, the inner diameter of a large circular ring boss of the pressing block is the same as the outer diameter of the blade root of the static blade, and the outer diameter of the large circular ring boss is the same as the inner diameter of a blade crown of the static blade.
Furthermore, the contact surfaces of the wire coils and the chassis are connected by adopting a bearing, and a plurality of uniformly distributed rolling bodies are arranged in the bearing; the diameter of the wire coil is the same as the inner diameter of the small circular boss of the base plate, and the wire coil is connected with the small circular boss through clearance fit.
Furthermore, a plurality of fan-shaped baffles are arranged between the clamping jaws and the stationary blade ring, and at least two clamping jaws act on the fan-shaped baffles.
In a second aspect, the present invention provides a welding method for a welding fixture for a turbine stationary blade ring, including the following steps:
s1, polishing and derusting the to-be-welded surface of the stationary blade and the area of 20mm around the to-be-welded surface of the stationary blade;
s2, clamping the stator blade into a welding tool, wherein the assembly gap is smaller than 0.05mm when the stator blade is assembled, and rounding the finished stator blade ring;
s3, carrying out demagnetization treatment on the stationary blade ring and the welding tool until the magnetic flux density is less than 1
Figure 381466DEST_PATH_IMAGE002
10 -4 T；
S4, after demagnetization is completed, wiping the surface to be welded by using non-woven fabric dipped with acetone or alcohol;
s5, placing the stator blade ring and the welding tool into a vacuum chamber, welding the stator blade ring by adopting small welding heat input, and completing welding according to a preset welding sequence;
s6, after the stator blade ring is completely cooled, welding the stator blade ring by adopting preset welding parameters and a preset welding sequence;
s7, after welding, keeping the vacuum chamber environment for 10-20 min, and exhausting and taking out;
and S8, carrying out heat treatment on the welded stationary blade ring and the welding tool together, and disassembling the stationary blade ring and the circular fixture after the heat treatment is finished.
Further, the welding sequence preset in the step S5 and the step S6 is a first weld, a second weld, a third weld, a fourth weld and a fifth weld; and the welding locus in step S6 coincides with the shallow weld formed in step S5.
Further, the welding parameters of the small welding heat input in step S5 are:
the working distance is 204-324 mm, the accelerating voltage is 60-140 kV, the focusing current is 510-2550 mA, the welding beam current is 16-36 mA, and the welding speed is 100-120 mm/min.
Further, the degree of vacuum in the vacuum chamber in steps S5 and S6 needs to be 6
Figure DEST_PATH_IMAGE003
10 -4 Pa；
In steps S5 and S6, after a weld is completed, the stationary blade ring is detached and turned over for clamping, that is, the stationary blade ring and the pressing block are turned over, and then the pressing block and the bottom plate are positioned and connected by a third bolt.
Further, in steps S5 and S6, the welding jig is placed in the vacuum chamber and kept in a horizontally placed state, and the welding jig is placed on the center of the rotatable welding stage.
The welding tool for the turbine stationary blade ring and the welding method thereof provided by the invention have the following beneficial effects:
the invention adopts the high-pressure high-vacuum electron beam welding technology to complete the welding of the turbine stationary blade ring according to the preset welding parameters, welding positions and sequence, and can greatly reduce the deformation of the turbine stationary blade ring caused by the welding stress, so that the connection between the stationary blades is more reliable, firm and stable.
Meanwhile, the invention designs a circular fixture, namely a welding tool, required by the method, the fixture adopts an upper clamping block and a lower clamping block to clamp the stationary blade ring in the vertical direction, simultaneously adopts a clamping jaw to push a fan-shaped baffle and an external limit to clamp and position the stationary blade ring in the radial direction, and realizes the constraint of the stationary blade ring in the vertical direction in the welding process of each welding line, so that the surface profile jumping quantity and the reference end surface planeness of the stationary blade ring formed by each stationary blade outer crown are greatly reduced, and the influence of welding deformation is greatly improved.
Drawings
FIG. 1 is a top view of a welding fixture for a turbine vane ring.
FIG. 2 is a cross-sectional view of a welding fixture for a turbine vane ring.
FIG. 3 is an exploded view of a welding tool for a turbine stationary blade ring.
FIG. 4 is a vane ring structure view.
Fig. 5 is a schematic perspective view of a circular fixture (welding tool).
Fig. 6 is a schematic view of an electron beam welding position.
Wherein, 1, a first welding seam; 2. a second weld; 3. a third weld; 4. a fourth weld; 5. a fifth weld; 6. stationary blades; 601. a leaf shroud; 602. a leaf body; 603. a blade root; 7. an outer limit; 701. a first countersunk head threaded hole; 8. a compression block; 801. a threaded hole; 802. a small fan-shaped hole; 803. a large circular boss; 9. a compression nut; 10. a first bolt; 11. a jaw; 12. a guide plate; 1201. a large stepped hole; 1202. a guide rail; 13. coiling the filaments; 14. a fan-shaped baffle plate; 15. a chassis; 1501. a second countersunk threaded hole; 1502. a small stepped hole; 1503. a through hole; 1504. a large fan-shaped hole; 1505. a small circular boss; 16. a second bolt; 17. a third bolt; 18. a fourth bolt; 19. and a rolling body.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
In embodiment 1, referring to fig. 1 to 6, the welding tool for the turbine stationary blade ring in the present scheme is a circular fixture, and the welding tool in the present embodiment, namely the circular fixture, controls welding deformation of the stationary blade ring, improves weld quality, meets design size requirements, greatly shortens production period, reduces labor cost, and improves production efficiency, and specifically includes a chassis 15, a compact block 8, a guide disc 12, and an outer limit 7; the base plate 15 is bolted to the hold-down blocks 8, guide discs 12 and outer restrictions 7 respectively.
In order to prevent the stator blade ring from generating serious deformation in the welding process, the outer limit 7 is arranged in the embodiment, the first countersunk threaded hole 701 is arranged on the upper surface and the lower surface of the outer limit 7, the corresponding through hole 1503 is also arranged on the base plate 15, so that the base plate 15 and the outer limit 7 are connected together through the fourth bolt 18, and the outer ring of the stator blade ring is limited through the limit of the outer limit 7.
The chassis 15 is internally provided with a plurality of large fan-shaped holes 1504 which are uniformly distributed, a small step hole 1502 is arranged between every two adjacent large fan-shaped holes 1504, the small step holes 1502 are connected with the pressing block 8, and the pressing block 8 is connected with the chassis 15 through the matching of a third bolt 17 and a pressing nut 9.
A small circular boss 1505 is arranged on the chassis 15, a plurality of second countersunk threaded holes 1501 are uniformly distributed on the small circular boss 1505, the small circular boss 1505 is connected with the guide disc 12, a large stepped hole 1201 matched with the second countersunk threaded holes 1501 is arranged on the guide disc 12, and the large stepped hole 1201 is matched with the first bolt 10 to be connected with the chassis 15.
The guide disc 12 is provided with a plurality of guide tracks 1202 for guiding the jaws 11; a disc thread 13 is embedded in the small circular boss 1505, and a plane thread matched with the claw 11 is arranged on the disc thread 13; when the wire coil 13 rotates, the claw 11 is driven by the planar thread to move along the guide track 1202, so that the stationary blade 6 is circumferentially clamped and loosened.
The compressing block 8 is provided with a large circular boss 803 for positioning and compressing the stationary blade 6; a plurality of small fan-shaped holes 802 which are uniformly distributed are formed in the pressing block 8, a threaded hole 801 is formed between every two adjacent small fan-shaped holes 802, and the threaded hole 801 and the third bolt 17 are matched and used for connecting the pressing block 8 and the chassis 15.
As a further technical scheme of the pressing block 8 in this embodiment, the pressing block 8 is a circular ring type, and includes an upper pressing block 8 and a lower pressing block 8, and the upper pressing block 8 and the lower pressing block 8 are matched with a pressing nut 9 through a second bolt 16 to compress and position the stationary blade ring in the vertical direction.
The inner diameter of the large circular boss 803 of the hold-down block 8 is the same as the outer diameter of the blade root 603 of the stationary blade 6, and the outer diameter of the large circular boss 803 is the same as the inner diameter of the shroud 601 of the stationary blade 6.
Referring to fig. 6, the stationary blade 6 includes a shroud 601, a body 602, and a root 603.
The contact surface of the wire coil 13 and the chassis 15 is connected in a bearing mode, a plurality of rolling bodies 19 which are uniformly distributed are arranged in the bearing, and the friction force between the wire coil 13 and the chassis 15 is reduced through the rolling bodies 19, so that labor is saved in the clamping process.
The diameter of the wire coil 13 is the same as the inner diameter of the small circular boss of the chassis 15, and the wire coil 13 is connected with the small circular boss 1505 through clearance fit.
In the process that the clamping jaws 11 radially compress the stationary blade ring, a plurality of fan-shaped baffles 14 are arranged between the clamping jaws 11 and the stationary blade ring, the fan-shaped baffles 14 can ensure that the clamping force applied to each stationary blade 6 in the stationary blade ring is uniform, and at least two clamping jaws 11 act on the fan-shaped baffles 14.
Embodiment 2, referring to fig. 1 to 6, the welding method of the welding tool for the turbine stationary blade ring of the embodiment welds the stationary blade ring by using a high-pressure high-vacuum electron beam welding technology according to preset welding parameters, welding positions and a preset welding sequence, and specifically includes the following steps:
step S1, polishing and derusting the surface to be welded and the 20mm area around the surface to be welded of the stationary blade 6, and then wiping the surface to be welded and the area around the surface to be welded by using non-woven fabrics dipped with acetone or alcohol to ensure that the surface to be welded and the 20mm area around the surface to be welded have no oil stain, rust, moisture, oxides or other harmful substances;
step S2, clamping the stationary blade 6 into a circular fixture (welding tool), wherein the assembly clearance is less than 0.05mm when the stationary blade 6 is assembled, and rounding the finished stationary blade ring;
step S3, demagnetizing the stationary blade ring and the welding tool until the magnetic flux density is less than 1
Figure 190284DEST_PATH_IMAGE003
10 -4 T；
Step S4, after the demagnetization treatment is finished, wiping the surface to be welded by non-woven fabric dipped with acetone or alcohol;
s5, placing the stator blade rings and the welding tool into a vacuum chamber, welding the stator blade rings by adopting small welding heat input, and completing welding according to a preset welding sequence to fix each stator blade ring and prevent deformation caused by overlarge welding heat input in the subsequent welding process;
step S6, after the stationary blade ring is completely cooled, welding the stationary blade ring by adopting preset welding parameters and a preset welding sequence;
step S7, after welding, keeping the vacuum chamber environment for 10-20 min, and exhausting and taking out;
and step S8, carrying out heat treatment on the welded stationary blade ring and the welding tool together, and disassembling the stationary blade ring and the circular fixture after the heat treatment is finished.
Specifically, in step S5 and step S6 of the present embodiment, the welding sequence is as shown in fig. 5, and a first weld 1, a second weld 2, a third weld 3, a fourth weld 4, and a fifth weld 5 are welded in sequence.
In step S5, the welding parameters used for the small welding heat input are: the working distance is 204-324 mm, the accelerating voltage is 60-140 kV, the focusing current is 510-2550 mA, the welding beam current is 16-36 mA, and the welding speed is 100-120 mm/min.
In step S6, the welding parameters are: the working distance is 204-324 mm, the accelerating voltage is 60-140 kV, the focusing current is 510-2550 mA, the welding beam current is 80-180 mA, and the welding speed is 500-600 mm/min.
In step S5 and step S6:
the vacuum degree in the vacuum chamber needs to reach 6
Figure 642125DEST_PATH_IMAGE003
10 -4 Pa。
After welding one welding seam, the static blade ring is required to be disassembled and turned for clamping, and in the process of re-clamping the static blade ring at every time, the pressing block 8 is not required to be disassembled, the third bolt 17 is only required to be disassembled, then the static blade ring and the pressing block 8 are turned, and the pressing block 8 and the bottom plate are positioned and connected through the third bolt 17.
After each welding, the stator blade ring can be taken out and clamped again after being completely cooled in the vacuum chamber, so that the welding seam is prevented from being oxidized due to overheating.
In the whole electron beam welding process, the circular clamp is kept in a horizontal placing state in the vacuum chamber.
The circular fixture is placed in the center of a rotatable welding platform, and the rotation speed of the welding platform can be controlled, namely the welding speed can be controlled in the welding process.
Be equipped with fixing device between welded platform and the circular fixture, fixing device can adopt to be existing for circular fixture keeps the position unchangeable when placing at every turn, and can not produce in welding process and remove.
In step S6, the welding locus at the time of welding is kept highly coincident with the shallow weld formed at the time of step S5.
In embodiment 3, the stationary blade 6 according to this embodiment is made of 12Cr12Mo martensitic heat-resistant steel, and the specific electron beam welding procedure is as follows:
step T1, polishing and derusting the surface to be welded and the 20mm area around the surface to be welded of the test plate, and then wiping the surface to be welded and the area around the surface to be welded by using non-woven fabrics dipped with acetone or alcohol to ensure that the surface to be welded and the 20mm area around the surface to be welded have no oil stain, rust, moisture, oxides and other harmful substances;
step T2, clamping the test plate into a circular fixture, wherein the assembly gap is smaller than 0.05mm during test plate assembly;
step T3, demagnetizing the test board and the circular fixture until the magnetic flux density is less than 1
Figure 224285DEST_PATH_IMAGE003
10 -4 T；
Step T4, after the test plate and the clamp finish the demagnetization treatment, using non-woven fabric to dip acetone or alcohol to wipe the surface to be welded;
step T5 and step T6, placing the test board and the clamp into the vacuum chamber and keeping the test board and the clamp in a horizontal placing state, and enabling the vacuum degree in the vacuum chamber to reach 6
Figure 241920DEST_PATH_IMAGE003
10 -4 Pa, welding the test plate;
the welding parameters are as follows:
the working distance is 204mm, the accelerating voltage is 80kV, the focusing current is 2000mA, the welding beam current is 95mA, and the welding speed is 200 mm/min;
step T7, after welding, keeping for 15min in a vacuum chamber high vacuum environment, and exhausting and taking out;
after the steps are completed, no welding crack is found on the welding test plate through X-ray detection.
According to the invention, the welding of the turbine stationary blade ring is completed by adopting a high-pressure high-vacuum electron beam welding technology according to preset welding parameters, welding positions and a preset sequence, so that the influence of welding deformation is greatly reduced, and the stationary blades 6 are more reliably, firmly and stably connected.
The invention designs the circular clamp using the method, the upper pressing block 8 and the lower pressing block 8 are adopted to limit the stationary blade ring in the vertical direction, the clamping jaws 11 and the outer limit 7 are adopted to limit the stationary blade ring in the radial direction, and the deformation of the stationary blade ring in the welding process is greatly reduced.
The detachably mounted compression block 8 of the invention ensures that the stationary blade ring is limited to a certain extent when being turned over every time, and reduces the influence of turning over on the welding process of the stationary blade ring.
While the embodiments of this invention have been described in detail, it should not be considered limited to such details. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.

Claims (10)

1. The utility model provides a welding frock for quiet leaf ring of turbine which characterized in that: comprises a chassis, a compaction block, a guide disc and an outer limit; the chassis is respectively connected with the pressing block, the guide disc and the outer limiting bolt;
the upper surface and the lower surface of the outer limit are provided with a first countersunk threaded hole, and the outer limit is used for limiting the outer ring of the stationary blade ring;
a plurality of large fan-shaped holes are uniformly distributed in the chassis, a small step hole is arranged between every two adjacent large fan-shaped holes, and the large fan-shaped holes are connected with the pressing block through the small step holes;
a small circular boss is arranged on the chassis, and a plurality of second countersunk head threaded holes are uniformly distributed on the small circular boss; a large stepped hole matched with the second countersunk head threaded hole is formed in the guide disc; the guide plate is provided with a plurality of guide tracks for guiding the clamping jaws; a disc thread is embedded in the small circular boss, and a plane thread matched with the clamping jaw is arranged on the disc thread; the plane thread drives the clamping jaw to move along the guide rail so as to clamp and loosen the stationary blade in the circumferential direction;
the compressing block is provided with a large circular boss for positioning and compressing the stationary blade; a plurality of small fan-shaped holes which are uniformly distributed are formed in the pressing block, a threaded hole is formed between every two adjacent small fan-shaped holes, and the threaded hole and the bolt are matched to connect the pressing block and the chassis.
2. The welding tool for the turbine stationary blade ring as set forth in claim 1, wherein: the pressing block is of a circular ring type and comprises an upper pressing block and a lower pressing block; the upper compression block and the lower compression block are matched with a compression nut through a second bolt so as to compress and position the stationary blade ring in the vertical direction.
3. The welding tool for the turbine stationary blade ring as set forth in claim 1, wherein: the inner diameter of a large circular ring boss of the pressing block is the same as the outer diameter of the blade root of the static blade, and the outer diameter of the large circular ring boss is the same as the inner diameter of the blade crown of the static blade.
4. The welding tool for the turbine stationary blade ring as set forth in claim 1, wherein: the contact surfaces of the wire coils and the chassis are connected by adopting a bearing, and a plurality of uniformly distributed rolling bodies are arranged in the bearing; the diameter of the wire coil is the same as the inner diameter of the small circular boss of the base plate, and the wire coil is connected with the small circular boss in a clearance fit mode.
5. The welding tool for the turbine stationary blade ring as set forth in claim 1, wherein: a plurality of fan-shaped baffles are arranged between the clamping jaws and the stationary blade ring, and at least two clamping jaws act on the fan-shaped baffles.
6. A welding method adopting the welding tool for the turbine stationary blade ring as claimed in any one of claims 1 to 5 is characterized by comprising the following steps of:
s1, polishing and derusting the to-be-welded surface of the stationary blade and the area of 20mm around the to-be-welded surface of the stationary blade;
s2, clamping the stator blade into a welding tool, wherein the assembly gap is smaller than 0.05mm when the stator blade is assembled, and rounding the finished stator blade ring;
s3, carrying out demagnetization treatment on the stationary blade ring and the welding tool until the magnetic flux density is less than 1
Figure DEST_PATH_IMAGE001
10 -4 T；
S4, after demagnetization is completed, wiping the surface to be welded by using non-woven fabric dipped with acetone or alcohol;
s5, placing the stationary blade ring and the welding tool into a vacuum chamber, performing shallow channel welding on the stationary blade ring by adopting small welding heat input, and completing welding according to a preset welding sequence;
s6, after the stator blade ring is completely cooled, welding the stator blade ring by adopting preset welding parameters and a preset welding sequence;
s7, after welding, keeping the vacuum chamber environment for 10-20 min, and exhausting and taking out;
and S8, carrying out heat treatment on the welded stationary blade ring and the welding tool together, and disassembling the stationary blade ring and the circular fixture after the heat treatment is finished.
7. The welding method for the welding tool of the turbine stationary blade ring according to claim 6, wherein the welding sequence preset in the step S5 and the step S6 is a first welding seam, a second welding seam, a third welding seam, a fourth welding seam and a fifth welding seam; and the welding locus in step S6 coincides with the shallow weld formed in step S5.
8. The welding method of claim 6, wherein the welding parameters of the small welding heat input in the step S5 are as follows:
the working distance is 204-324 mm, the accelerating voltage is 60-140 kV, the focusing current is 510-2550 mA, the welding beam current is 16-36 mA, and the welding speed is 100-120 mm/min.
9. The welding method of claim 8, wherein the vacuum degree in the vacuum chamber in steps S5 and S6 is required to be 6
Figure 103355DEST_PATH_IMAGE001
10 -4 Pa；
In steps S5 and S6, after a weld is completed, the stationary blade ring is detached and turned over for clamping, that is, the stationary blade ring and the pressing block are turned over, and then the pressing block and the bottom plate are positioned and connected by a third bolt.
10. The welding method of a welding tool for a turbine stationary blade ring as set forth in claim 8, wherein in the steps S5 and S6, the welding tool is placed in a vacuum chamber and kept in a horizontally placed state, and the welding tool is placed on the center of a rotatable welding platform.
CN202210722556.6A 2022-06-24 2022-06-24 Welding tool for turbine stationary blade ring and welding method thereof Pending CN115055885A (en)

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CN202210722556.6A CN115055885A (en) 2022-06-24 2022-06-24 Welding tool for turbine stationary blade ring and welding method thereof

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Application Number Priority Date Filing Date Title
CN202210722556.6A CN115055885A (en) 2022-06-24 2022-06-24 Welding tool for turbine stationary blade ring and welding method thereof

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Publication Number Publication Date
CN115055885A true CN115055885A (en) 2022-09-16

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