A fixture and method for welding front and rear wall panels of a rectifier support cabinet

Abstract

The present application relates to the technical field of aero-engine manufacturing, and particularly relates to a clamp and method for welding front and rear wall plates of a rectification support casing, the clamp comprising a support, a positioning seat, a pressing plate and a plurality of hook-shaped bolts; the positioning seat is installed on the right end face of the support; a positioning ring is integrally formed on the right end face of the positioning seat and used for cooperation with the center hole of an inner ring body; a first positioning pin used for cooperation with a reference hole is arranged on the right end face of the positioning seat; a support plate is installed on the left end face of the support, and a second positioning pin is arranged on the support plate and used for cooperation with a positioning hole on the front wall plate to be welded; a first positioning column and a second positioning column are installed on the positioning seat; a double-end stud is installed on the positioning seat, the right end of the double-end stud penetrates through the pressing plate, and a first nut is screwed on the right end; a third positioning pin is installed on one end of the pressing plate and used for cooperation with a positioning hole on the rear wall plate to be welded; the screw rod part of the left end of the hook-shaped bolt penetrates through the positioning seat and a second nut is screwed on the screw rod part.

Description

Technical Field

[0001] This invention relates to the field of aero-engine manufacturing technology, and in particular to a fixture and method for welding the front and rear wall plates of a fairing support casing. Background Technology

[0002] Combination Figure 1 The diagram shows a schematic of the turbine support casing of an aero-engine. This turbine support casing is an important core component in the turbine support of an aero-engine, and it is located in a complex environment with high temperature and high pressure, bearing a large number of mechanical and aerodynamic loads.

[0003] The rectifier support casing adopts a split structure, consisting of a casing shell welded together with multiple support plates. The casing shell includes an inner ring and an outer ring. Front and rear wall plates need to be welded to both ends of the outer ring, and there are angular requirements between the front and rear wall plates and the casing shell.

[0004] In the prior art, patent application CN117000814A discloses a heat-forming fixture and method for welding titanium alloy multi-plate parts. The heat-forming operation of the support plate is simple and effectively overcomes the problems of high difficulty, low efficiency and inability to control the dimensions after heat forming when using a blowtorch for heat forming in the prior art.

[0005] The thermal alignment fixture and method disclosed in the prior art CN117000814A, although applicable to... Figure 1 The rectifier support casing shown is only used for thermally shaping the support plate. It is not disclosed how the front and rear wall plates are welded to both ends of the outer ring of the casing shell, nor is it disclosed how the angular relationship between the front and rear wall plates and the casing shell is determined during welding. Summary of the Invention

[0006] The main objective of this invention is to provide a fixture and method for welding the front and rear wall plates of a rectifier support casing, thereby solving the aforementioned technical problems.

[0007] To achieve the above objectives, in a first aspect, the present invention proposes a fixture for welding the front and rear wall plates of a rectifier support casing. The rectifier support casing includes an outer ring body and an inner ring body, and a reference hole is provided on the left end face of the inner ring body. The fixture includes a support, a positioning seat, a pressure plate, and multiple hook bolts. The positioning seat is mounted on the right end face of the support. A positioning ring is integrally formed on the right end face of the positioning seat, and the positioning ring is used to cooperate with the center hole of the inner ring body. A first positioning pin is provided on the right end face of the positioning seat for cooperating with the reference hole. A support plate is mounted on the left end face of the support. A second positioning pin is provided on the plate for engaging with the positioning hole on the front wall plate to be welded; a first positioning post and a second positioning post are installed on the positioning seat, and the right ends of the first positioning post and the second positioning post are positioned and engaged with the pressure plate; a double-ended stud is installed on the positioning seat, and the right end of the double-ended stud passes through the pressure plate and is screwed with a first nut; a third positioning pin is installed at one end of the pressure plate for engaging with the positioning hole on the back wall plate to be welded; the screw portion of the left end of the hook bolt passes through the positioning seat and is screwed with a second nut; the hook-shaped portion of the right end of the hook bolt is used to press against the right end face of the inner ring body.

[0008] Preferably, a first positioning bushing and a second positioning bushing are installed on the pressure plate; the right end of the first positioning post is configured as a cylindrical pin, and the cylindrical pin is used to be inserted into the central hole of the first positioning bushing; the right end of the second positioning post is configured as a diamond-shaped pin, and the diamond-shaped pin is used to be inserted into the central hole of the second positioning bushing.

[0009] Preferably, the left end of the first positioning post is configured as a first insertion post; the left end of the second positioning post is configured as a second insertion post; both the first insertion post and the second insertion post are inserted into the positioning seat by means of interference fit.

[0010] Preferably, two third positioning bushings are installed on the support plate; a type A fixed positioning pin and a type B fixed positioning pin are installed on the left end face of the support; the type A fixed positioning pin is inserted into the inner hole of one of the third positioning bushings; the type B fixed positioning pin is inserted into the inner hole of the other third positioning bushing; the support plate and the support are fastened together by hexagonal head bolts.

[0011] Preferably, the positioning seat and the support are fastened together by an internal hexagon head screw, and a pin is provided between the positioning seat and the support.

[0012] Preferably, a threaded hole is provided at the center of the positioning seat, and the left end of the double-ended stud is screwed into the threaded hole at the center of the positioning seat; a hexagonal thin nut is screwed into the left end of the double-ended stud, and the left end face of the hexagonal thin nut is pressed against the right end face of the positioning seat.

[0013] Preferably, the outer peripheral surface of the support slides into the inner hole surface at the left end of the outer ring body.

[0014] Preferably, when the right end face of the positioning seat abuts against the left end face of the inner ring body, there is a gap t between the right end face of the support and the stepped surface of the left end inner hole of the outer ring body, and t≥1.5mm.

[0015] Secondly, the present invention also proposes a method for welding the front and rear wall plates of a rectifier support casing, using the aforementioned fixture, and comprising the following steps: S1. The assembly formed by the support, positioning seat, first positioning pin, second positioning pin and double-ended stud is installed into the rectifier support housing, so that the positioning ring on the right end face of the positioning seat is inserted into the center hole of the inner ring body, and the first positioning pin is inserted into the reference hole of the inner ring body. S2. Hook the hook bolt to the right end face of the inner ring body, and tighten the second nut after the screw part of the left end of the hook bolt passes through the positioning seat; so that the right end face of the positioning seat abuts against the left end face of the inner ring body. S3. Place the front wall panel to be welded onto the outer circumferential surface of the left end edge plate of the outer ring body, then assemble the support plate with the second positioning pin 5 onto the left end face of the support, and make the second positioning pin on the support plate cooperate with the positioning hole on the front wall panel to be welded, so as to determine the angular position of the front wall panel to be welded; perform positioning spot welding on the front wall panel to be welded and the left end edge plate of the outer ring body. S4. Place the wall panel to be welded onto the outer circumferential surface of the right end edge plate of the outer ring body, install the pressure plate, and use the right ends of the first and second positioning posts to cooperate with the pressure plate to position the pressure plate; tighten the first nut so that the left end face of the pressure plate is close to the right end face of the outer ring body. When assembling the pressure plate, insert the third positioning pin on the pressure plate into the positioning hole of the wall panel to be welded to determine the angular position of the wall panel to be welded; perform tack welding on the wall panel to be welded and the right end edge plate of the outer ring body. S5. Before welding, perform argon arc welding on the joint between the wall plate and the left edge plate of the outer ring body; after welding, perform argon arc welding on the joint between the wall plate and the right edge plate of the outer ring body. S6. After the workpiece has cooled down, remove the fixture from the rectifier support housing.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: (1) The fixture provided by the present invention is simple and convenient to operate. When assembling the front wall panel to be welded and the rear wall panel to be welded, the angular direction of the front wall panel to be welded is determined by the second positioning pin and the angular direction of the rear wall panel to be welded is determined by the third positioning pin, so as to ensure the angular position of the front wall panel to be welded and the rear wall panel to be welded with respect to the fixture. The angular position of the inner ring of the rectifier support casing to be welded with respect to the fixture is ensured by the first positioning pin, so as to ensure the angular position of the front wall panel to be welded and the rear wall panel to be welded with respect to the rectifier support casing.

[0017] (2) Improve welding quality and efficiency. By utilizing the welding fixture and method provided by this invention, welding efficiency and welding quality are greatly improved. In addition, by using the outer peripheral surface of the support to cooperate with the inner hole surface at the left end of the outer ring body (101), and by using the positioning ring to cooperate with the center hole of the inner ring body, the shrinkage deformation of the outer ring body and the inner ring body after welding of the front wall plate and the rear wall plate can be effectively controlled. Since the welding deformation is effectively controlled, rework can be avoided to a great extent, the part processing cycle can be reduced, and the part processing efficiency can be improved.

[0018] (3) In this invention, by using the cylindrical pin at the right end of the first positioning post and the diamond pin at the right end of the second positioning post to cooperate with the first positioning bushing and the second positioning bushing on the pressure plate respectively, the angular direction of the pressure plate can be accurately determined, which is conducive to improving the angular positioning accuracy of the wall panel to be welded.

[0019] (5) In this invention, by using a type A fixed positioning pin to cooperate with one of the third positioning bushings and using a type B fixed positioning pin to cooperate with another third positioning bushing, the support plate can be accurately positioned, which is beneficial to improving the angular positioning accuracy of the wall plate before welding. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the fairing support casing of an aero engine.

[0022] Figure 2 This is a schematic diagram of the structure when the clamp provided by the present invention is engaged with the rectifier support casing.

[0023] Figure 3 for Figure 2 View from direction B in the middle.

[0024] Figure 4 for Figure 2 The right view.

[0025] Explanation of reference numerals: 1. Support; 2. Positioning seat; 2a. Positioning ring; 3. First positioning pin; 4. Support plate; 5. Second positioning pin; 6. Pressure plate; 7. Third positioning pin; 8. First positioning post; 8a. Cylindrical pin; 8b. First insertion post; 9. Second positioning post; 9a. Diamond pin; 9b. Second insertion post; 10. Hook bolt; 11. Nameplate; 12. Type A fixed positioning pin; 13. Third positioning bushing; 14a 14b. First positioning bushing; 15. Second positioning bushing; 16. Type B fixed positioning pin; 17. Hex head bolt; 18. Second nut; 19. Hex thin nut; 20. First nut; 21. Double-ended stud; 22. Slotted cylindrical head screw; 23. Socket hex cylindrical head screw; 101. Pin; 102. Outer ring body; 103. Inner ring body; 104. First pin hole; 200. Front wall plate to be welded; 300. Rear wall plate to be welded. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0029] As shown in the accompanying drawings, in a first aspect, this embodiment provides a fixture for welding the front and rear wall plates of a rectifier support casing. The rectifier support casing includes an outer ring body 101 and an inner ring body 102, and a reference hole 103 is provided on the left end face of the inner ring body 102. The fixture includes a support 1, a positioning seat 2, a pressure plate 6, and a plurality of hook bolts 10.

[0030] The positioning seat 2 is installed on the right end face of the support 1; a positioning ring 2a is integrally formed on the right end face of the positioning seat 2, and the positioning ring 2a is used to cooperate with the central hole of the inner ring body 102; specifically, the right end face of the positioning seat 2 and the positioning ring 2a together form a positioning stop, which is used to position with the left end of the central hole of the inner ring body 102.

[0031] A first positioning pin 3 is provided on the right end face of the positioning seat 2 for cooperating with the reference hole 103. By using the reference hole 103 and the first positioning pin 3, the angular position between the fixture and the rectifier support casing can be determined.

[0032] A support plate 4 is installed on the left end face of the support 1, and a second positioning pin 5 is provided on the support plate 4 for cooperating with the positioning hole on the front wall plate 200 to be welded.

[0033] A first positioning post 8 and a second positioning post 9 are installed on the positioning seat 2, and the right ends of the first positioning post 8 and the second positioning post 9 are positioned and engaged with the pressure plate 6. A double-ended stud 20 is installed on the positioning seat 2, and the right end of the double-ended stud 20 passes through the pressure plate 6 and is screwed with a first nut 19, which is a shouldered hexagonal nut. The first positioning post 8 and the second positioning post 9 are used to determine the angular position of the pressure plate 6, thereby limiting the rotation of the pressure plate 6. A third positioning pin 7 is installed at one end of the pressure plate 6 for engaging with the positioning hole on the wall panel 300 to be welded.

[0034] By adopting the above structure, the angular orientation of the front wall panel to be welded is determined by the second positioning pin 5, and the angular orientation of the rear wall panel to be welded is determined by the third positioning pin 7. This ensures the angular positions of the front and rear wall panels to be welded and the fixture. The angular positions of the inner ring 102 of the rectifier support casing and the fixture are also ensured by the first positioning pin 3.

[0035] The screw portion at the left end of the hook bolt 10 passes through the positioning seat 2 and is screwed onto a second nut 17, which is a shouldered hexagonal nut; the hook-shaped portion at the right end of the hook bolt 10 is used to press against the right end face of the inner ring 102.

[0036] Combination Figure 2As shown, a first positioning bushing 14a and a second positioning bushing 14b are installed on the pressure plate 6; a cylindrical pin 8a is integrally formed on the right end of the first positioning post 8, and the cylindrical pin 8a is used to insert into the central hole of the first positioning bushing 14a; a rhomboid pin 9a is integrally formed on the right end of the second positioning post 9, and the rhomboid pin 9a is used to insert into the central hole of the second positioning bushing 14b. By utilizing the cylindrical pin 8a on the right end of the first positioning post 8 and the rhomboid pin 9a on the right end of the second positioning post 9 to cooperate with the first positioning bushing 14a and the second positioning bushing 14b on the pressure plate 6 respectively, the angular orientation of the pressure plate 6 can be accurately determined, and the pressure plate 6 is rotated and limited to prevent the pressure plate 6 from rotating around the axis of the double-headed stud 20, thereby improving the angular positioning accuracy of the wall panel 300 after welding.

[0037] In this embodiment, the left end of the first positioning post 8 is configured as a first insertion post 8b; the left end of the second positioning post 9 is configured as a second insertion post 9b; both the first insertion post 8b and the second insertion post 9b are inserted into the positioning seat 2 by means of interference fit.

[0038] Combination Figure 3 As shown, two third positioning bushings 13 are installed on the support plate 4; A-type fixed positioning pin 12 and B-type fixed positioning pin 15 are installed on the left end face of the support 1; the A-type fixed positioning pin 12 is inserted into the inner hole of one of the third positioning bushings 13; the B-type fixed positioning pin 15 is inserted into the inner hole of the other third positioning bushing 13; the support plate 4 and the support 1 are fastened together by hexagonal head bolts 16.

[0039] Combination Figure 2 As shown, the positioning seat 2 and the support 1 are fastened together by an internal hexagon head screw 22, and a pin 23 is provided between the positioning seat 2 and the support 1. Further, a threaded hole is provided in the center of the positioning seat 2, and the left end of the double-ended stud 20 is screwed into the threaded hole in the center of the positioning seat 2; a hexagonal thin nut 18 is screwed into the left end of the double-ended stud 20, and the left end face of the hexagonal thin nut 18 abuts against the right end face of the positioning seat 2.

[0040] In this embodiment, the outer peripheral surface of the support 1 slides into the inner hole surface at the left end of the outer ring body 101. When the right end face of the positioning seat 2 abuts against the left end face of the inner ring body 102, there is a gap t between the right end face of the support 1 and the stepped surface of the inner hole at the left end of the outer ring body 101, and t ≥ 1.5 mm. By setting the gap t, interference between the right end face of the support 1 and the stepped surface of the inner hole at the left end of the outer ring body 101 can be avoided.

[0041] In this embodiment, a nameplate 11 is installed on the pressure plate 6 by four slotted cylindrical head screws 21. The nameplate 11 is engraved with the model information of the rectifier support casing to which the fixture is applicable.

[0042] Secondly, this embodiment also provides a method for welding the front and rear wall plates of the rectifier support casing, using the above-mentioned fixture, including the following steps: S1. The assembly formed by the support 1, the positioning seat 2, the first positioning pin 8, the second positioning pin 9 and the double-ended stud 20 is installed into the rectifier support housing, so that the positioning ring 2a on the right end face of the positioning seat 2 is inserted into the center hole of the inner ring body 102, and the first positioning pin 3 is inserted into the reference hole 103 of the inner ring body 102.

[0043] S2. Hook the hook bolt 10 to the right end face of the inner ring body 102, and tighten the second nut 17 after the screw part of the left end of the hook bolt 10 passes through the positioning seat 2; so that the right end face of the positioning seat 2 abuts against the left end face of the inner ring body 102.

[0044] S3. Place the front wall panel 200 to be welded onto the outer circumferential surface of the left end edge plate of the outer ring body 101. Then, assemble the support plate 4 with the second positioning pin 5 onto the left end face of the support 1, so that the second positioning pin 5 on the support plate 4 mates with the positioning hole on the front wall panel 200 to be welded, thereby determining the angular position of the front wall panel 200 to be welded. Perform positioning spot welding on the front wall panel 200 to be welded and the left end edge plate of the outer ring body 101. Specifically, when assembling the support plate 4, insert the type A fixed positioning pin 12 into the inner hole of one of the third positioning bushings 13; insert the type B fixed positioning pin 15 into the inner hole of the other third positioning bushing 13. At the same time, adjust the angular position of the front wall panel 200 to insert the second positioning pin 5 into the positioning hole on the front wall panel 200 to be welded, and then tighten the hexagonal head bolt 16.

[0045] S4. Place the wall panel 300 to be welded onto the outer circumferential surface of the right end edge plate of the outer ring body 101, and install the pressure plate 6. The right ends of the first positioning post 8 and the second positioning post 9 cooperate with the pressure plate 6. Specifically, the cylindrical pin 8a at the right end of the first positioning post 8 is inserted into the center hole of the first positioning bushing 14a, and the diamond-shaped pin 9a at the right end of the second positioning post 9 is inserted into the center hole of the second positioning bushing 14b to position the pressure plate 6. Tighten the first nut 19 so that the left end face of the pressure plate 6 is close to the right end face of the outer ring body 101. When assembling the pressure plate 6, adjust the angular orientation of the wall panel 300 before tightening the first nut 19 so that the third positioning pin 7 on the pressure plate 6 is inserted into the positioning hole of the wall panel 300 to be welded, thereby determining the angular position of the wall panel 300 to be welded. Perform tack welding on the wall panel 300 to be welded and the right end edge plate of the outer ring body 101.

[0046] S5. Perform argon arc welding on the joint between the wall plate 200 before welding and the left edge plate of the outer ring body 101; perform argon arc welding on the joint between the wall plate 300 after welding and the right edge plate of the outer ring body 101. S6. After the workpiece has cooled down, remove the fixture from the rectifier support housing.

[0047] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fixture for welding the front and rear wall plates of a rectifier support casing, the rectifier support casing comprising an outer ring body (101) and an inner ring body (102), wherein a reference hole (103) is provided on the left end face of the inner ring body (102); characterized in that, The fixture includes a support (1), a positioning seat (2), a pressure plate (6), and multiple hook bolts (10); The positioning seat (2) is installed on the right end face of the support (1); A positioning ring (2a) is integrally formed on the right end face of the positioning seat (2), and the positioning ring (2a) is used to cooperate with the center hole of the inner ring body (102); A first positioning pin (3) is provided on the right end face of the positioning seat (2) for cooperating with the reference hole (103); A support plate (4) is installed on the left end face of the support (1), and a second positioning pin (5) is provided on the support plate (4) for cooperating with the positioning hole on the front wall plate (200) to be welded; A first positioning post (8) and a second positioning post (9) are installed on the positioning seat (2), and the right ends of the first positioning post (8) and the second positioning post (9) are positioned and engaged with the pressure plate (6); A double-ended stud (20) is installed on the positioning seat (2). The right end of the double-ended stud (20) passes through the pressure plate (6) and is screwed with a first nut (19). A third positioning pin (7) is installed at one end of the pressure plate (6) for engaging with the positioning hole on the back wall panel (300) to be welded; The screw portion at the left end of the hook bolt (10) passes through the positioning seat (2) and is screwed with a second nut (17); the hook-shaped portion at the right end of the hook bolt (10) is used to press against the right end face of the inner ring body (102); A first positioning bushing (14a) and a second positioning bushing (14b) are installed on the pressure plate (6). The right end of the first positioning pin (8) is configured as a cylindrical pin (8a), and the cylindrical pin (8a) is used to be inserted into the center hole of the first positioning bushing (14a); The right end of the second positioning post (9) is configured as a diamond pin (9a), and the diamond pin (9a) is used to be inserted into the center hole of the second positioning bushing (14b); Two third positioning bushings (13) are installed on the support plate (4); A type A fixed positioning pin (12) and B type fixed positioning pin (15) are installed on the left end face of the support (1). The type A fixed positioning pin (12) is inserted into the inner hole of one of the third positioning bushings (13); The type B fixed positioning pin (15) is inserted into the inner hole of another third positioning bushing (13); The support plate (4) and the support (1) are fastened together by hexagonal head bolts (16).

2. The clamp according to claim 1, characterized in that, The left end of the first positioning post (8) is configured as the first plug-in post (8b); the left end of the second positioning post (9) is configured as the second plug-in post (9b). The first plug-in post (8b) and the second plug-in post (9b) are both inserted into the positioning seat (2) by means of interference fit.

3. The clamp according to claim 1, characterized in that, The positioning seat (2) and the support (1) are fastened together by an internal hexagonal head screw (22), and a pin (23) is provided between the positioning seat (2) and the support (1).

4. The clamp according to claim 1, characterized in that, A threaded hole is provided in the center of the positioning seat (2), and the left end of the double-ended stud (20) is screwed into the threaded hole in the center of the positioning seat (2); a hexagonal thin nut (18) is screwed into the left end of the double-ended stud (20), and the left end face of the hexagonal thin nut (18) is pressed against the right end face of the positioning seat (2).

5. The clamp according to claim 1, characterized in that, The outer peripheral surface of the support (1) is in sliding fit with the inner hole surface at the left end of the outer ring body (101).

6. The clamp according to claim 1, characterized in that, When the right end face of the positioning seat (2) abuts against the left end face of the inner ring body (102), there is a gap t between the right end face of the support (1) and the stepped surface of the left end inner hole of the outer ring body (101).

7. The clamp according to claim 6, characterized in that, The gap t ≥ 1.5 mm.

8. A method for welding the front and rear wall plates of a rectifier support casing, characterized in that, The clamp according to any one of claims 1 to 7 comprises the following steps: S1. The assembly formed by the support (1), positioning seat (2), first positioning post (8), second positioning post (9) and double-ended stud (20) is installed into the rectifier support housing, so that the positioning ring (2a) on the right end face of the positioning seat (2) is inserted into the center hole of the inner ring body (102), and the first positioning pin (3) is inserted into the reference hole (103) of the inner ring body (102); S2. Hook the right end face of the inner ring body (102) with the hook bolt (10), and tighten the second nut (17) after the screw part of the left end of the hook bolt (10) passes through the positioning seat (2); so that the right end face of the positioning seat (2) abuts against the left end face of the inner ring body (102); S3. Place the front wall plate (200) to be welded on the outer circumferential surface of the left end edge plate of the outer ring body (101), and then assemble the support plate (4) with the second positioning pin (5) onto the left end face of the support (1), so that the second positioning pin (5) on the support plate (4) matches the positioning hole on the front wall plate (200) to be welded, thereby determining the angular position of the front wall plate (200) to be welded; perform positioning spot welding on the front wall plate (200) to be welded and the left end edge plate of the outer ring body (101); S4. Place the wall panel (300) to be welded onto the outer circumferential surface of the right end edge plate of the outer ring body (101), install the pressure plate (6), and use the right ends of the first positioning post (8) and the second positioning post (9) to cooperate with the pressure plate (6) to position the pressure plate (6); tighten the first nut (19) so that the left end face of the pressure plate (6) is close to the right end face of the outer ring body (101). When assembling the pressure plate (6), insert the third positioning pin (7) on the pressure plate (6) into the positioning hole of the wall panel (300) to be welded, so that the angular position of the wall panel (300) to be welded can be determined; perform positioning spot welding on the wall panel (300) to be welded and the right end edge plate of the outer ring body (101); S5. Argon arc welding is performed on the joint between the wall plate (200) before welding and the left edge plate of the outer ring body (101); Argon arc welding is performed on the joint between the wall plate (300) after welding and the right edge plate of the outer ring body (101). S6. After the workpiece has cooled down, remove the fixture from the rectifier support housing.

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