Fixture and method for welding mounting seat on combustion chamber casing

Abstract

The invention relates to the technical field of aero-engine welding, in particular to a clamp and method for a combustion chamber casing welding mounting base. The clamp comprises a bottom plate and a positioning ring arranged on the top surface of the bottom plate; a positioning spigot is formed in the top surface of the positioning ring and is used for positioning an inner hole of a flange edge at the lower end of the combustion chamber casing; a plurality of pressing hooks are uniformly distributed on the positioning ring close to the edge; a plurality of supporting columns are arranged on the top face of the bottom plate, and a jacking air injection device is arranged on the top of each supporting column and used for jacking an inner molded surface, corresponding to the welding portion of the mounting base, of a barrel of the combustion chamber casing and injecting inert gas to the inner molded surface of the jacking portion. By means of the clamp and the method, deformation of the combustion chamber casing welding installation base is effectively controlled, the stability of the product welding quality is improved, the welding clamp is easy and convenient to operate, the welding method is efficient, and the labor intensity of operators is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine welding, and in particular to a fixture and a method for welding a combustion chamber casing mounting seat. Background Art

[0002] Combination Figure 1 The figure shows the structure of the combustion chamber casing. Various mounting seats are welded on the cylinder of the combustion chamber casing. Figure 1 a to j represent various types of mounting seats. The thickness of the base material at the butt joint of the mounting seat weld is t=2.7 mm. A large amount of heat is required to melt through the base material during welding. Therefore, the mounting seat is greatly deformed during welding in a free state.

[0003] In order to reduce the deformation of the combustion chamber casing welding mount, the cylinder can be pre-deformed in the opposite direction of the welding deformation. However, the pre-deformation method depends on the operator's skill level and experience, the welding deformation control effect is not good, the product quality is unstable, and it does not meet the subsequent machining requirements. In addition, the cylinder material of the combustion chamber casing is GH2150, which has high hardness and is not easy to pre-deform.

[0004] In contrast, welding the mounting seat of the combustion chamber casing in a limited state is a more superior method to control welding deformation. Studies have shown that the welding deformation is effectively controlled by using a tooling and a hydraulic press to weld the mounting seat, and the product quality is stable. For example, the patent application with publication number CN109382624A discloses a welding tooling and welding method for an aircraft engine mounting seat, which solves the problem that the mounting seat of large thin-walled aircraft parts cannot be welded in a limited state and the mounting seat is severely deformed after welding.

[0005] However, the method in CN109382624A requires multiple sets of tooling. After welding one mounting seat, it is necessary to replace different tooling after the parts are cooled to weld other mounting seats, resulting in high labor intensity for the operator, complicated welding process operation and long waiting time. Summary of the invention

[0006] The main purpose of the present invention is to provide a fixture and method for welding a combustion chamber casing mounting seat, aiming to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a fixture for welding a mounting seat of a combustion chamber casing, comprising a base plate and a positioning ring arranged on the top surface of the base plate; a positioning stop is arranged on the top surface of the positioning ring for positioning the inner hole of the flange edge at the lower end of the combustion chamber casing; a plurality of pressure hooks are evenly distributed near the edge of the positioning ring; a plurality of pillars are arranged on the top surface of the base plate, and a tightening jet device is arranged on the top of each pillar, which is used to tighten on the inner surface of the cylinder of the combustion chamber casing corresponding to the welding position of the mounting seat and spray inert gas onto the inner surface of the tightening position.

[0008] Preferably, the tightening jet device includes an insert block, a support block and an air nozzle; a radial slide groove is provided on the top of the pillar; the insert block is slidably installed in the radial slide groove, and the support block is installed at the end of the insert block; a driving mechanism is provided on the pillar for driving the insert block to move on the radial slide groove; the support block has a supporting surface, and an air cavity is provided inside the support block; a ventilation groove is provided on the supporting surface, and the ventilation groove and the air cavity are connected through a plurality of ventilation holes; a ventilation pipe is provided inside the insert block, and the air nozzle is installed on the air inlet of the ventilation pipe, and the air outlet of the ventilation pipe is connected to the air cavity of the support block; the air nozzle is connected to an argon gas source through an air pipe.

[0009] Preferably, the driving mechanism includes a hexagonal clamping screw and a support plate; a notch is provided on one end of the plug block away from the supporting block; the support plate is mounted on the side of the pillar, the hexagonal clamping screw is screwed onto the support plate, and the hexagonal clamping screw passes through the rear head of the support plate and is clamped in the notch of the plug block.

[0010] Preferably, an angular support is provided on the bottom plate, an angular latch is inserted into the top of the angular support, and the inner end of the angular latch is used to be inserted into the angular hole of the combustion chamber casing.

[0011] Preferably, an internal thread is provided on the air inlet of the ventilation duct, an external thread is provided on the outer cylindrical surface of the lower half of the air nozzle, and an annular boss is provided on the outer cylindrical surface of the middle part of the air nozzle; the lower half of the air nozzle is threadedly connected to the air inlet of the ventilation duct; a sealing gasket is provided between the annular boss of the air nozzle and the plug.

[0012] Preferably, the radial slide groove is a rectangular groove with an open top and radial ends; a cover plate is installed on the top of the pillar by screws; the cover plate and the radial slide groove together form a rectangular through hole; the plug-in block includes a sliding plug-in part, which is a quadrangular prism with a rectangular cross-section; the sliding plug-in part is slidably inserted in the rectangular through hole formed by the cover plate and the radial slide groove.

[0013] Preferably, a positioning plug is provided at the center position of the bottom surface of the bottom plate; a stopper is provided on the top surface of the positioning plug and is inserted into the center hole of the bottom plate.

[0014] Preferably, two ear plates are provided on the support block, and a slot is formed between the two ear plates;

[0015] The end of the plug block is inserted into a slot formed by two ear plates, and the ear plates and the plug block are connected by cylindrical head hexagon socket screws.

[0016] On the other hand, the present invention also provides a method for welding a combustion chamber casing mounting seat, using the above-mentioned fixture, comprising the following steps:

[0017] S1. Install the entire fixture on the turntable of the welding workbench through the base plate, and remove the angle support from the base plate;

[0018] S2. Match the inner hole of the flange at the lower end of the combustion chamber casing with the positioning stop of the positioning ring, and press the pressing hook onto the flange at the lower end of the combustion chamber casing. At this time, the pressing hook is not locked first;

[0019] S3. Install the removed angle support on the bottom plate, rotate the combustion chamber casing, insert the angle pin on the angle support into the angle hole of the combustion chamber casing; lock the pressure hook to press the flange edge at the lower end of the combustion chamber casing;

[0020] S4, connecting the gas nozzle on the top-tightening jet device at the corresponding position of the mounting seat to be welded to the argon gas source through the gas pipe, and passing argon gas according to the parameters;

[0021] S5. Turn the hexagonal clamping screw to push the insert block to move radially outward, so that the support surface of the support block is pressed against the inner surface of the cylinder of the combustion chamber casing corresponding to the welding part of the mounting seat;

[0022] S6. Turn the turntable to move the mounting base to be welded to a position where the welder can easily operate;

[0023] S7, adjust the welding machine according to the welding parameters and weld the mounting seat;

[0024] S8, repeat steps S4 to S7 to complete the welding of all mounting seats;

[0025] S9. After the combustion chamber casing has cooled down, turn the hexagonal clamping screw to reset the top jet device; loosen the clamping hook, remove the angular support, and remove the welded combustion chamber casing from the fixture.

[0026] Preferably, before welding, the welding bottom hole on the combustion chamber casing barrel is ground, and all the bottom hole end faces and the area within 20 mm along the hole edge are polished to remove the oxide scale; the mounting seat to be welded is repaired so that the mounting seat matches the welding bottom hole on the combustion chamber casing barrel to ensure that the misalignment is no more than 0.3 mm and the butt clearance is no more than 0.5 mm.

[0027] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0028] (1) The fixture and welding method provided by the present invention are provided with a plurality of pillars on the top surface of the bottom plate, and a pressing and jetting device is provided at the top of each pillar, which is used to press against the inner surface of the cylinder of the combustion chamber casing corresponding to the welding part of the mounting seat and spray inert gas to the inner surface of the pressing part. The deformation of the combustion chamber casing welding mounting seat is effectively controlled, and the stability of the product welding quality is improved. The welding fixture is simple and convenient to operate, the welding method is efficient, and the labor intensity of the operator is reduced.

[0029] (2) In the present invention, a plurality of pillars are provided on the top surface of the bottom plate, and a tightening jet device is provided on the top of each pillar. Specifically, the number of the pillars is consistent with the number of mounting seats to be welded, that is, the tightening jet device on each pillar can be tightened on the inner surface of the cylinder of the combustion chamber casing corresponding to the welding position of the mounting seat. Therefore, a set of clamps can be used to complete the welding of all the mounting seats on the entire combustion chamber casing, thereby greatly improving the welding efficiency.

[0030] (3) In the present invention, when welding is performed, the entire fixture is mounted on a turntable of a welding workbench through a base plate. During the welding operation, the turntable is rotated to achieve welding of mounting seats at different angles, and the welding gun will not interfere with the mounting seat during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the structure of the combustion chamber casing after the mounting base is welded;

[0033] Figure 2 A top view of a fixture for welding a mounting seat of a combustion chamber casing provided by the present invention;

[0034] Figure 3 for Figure 2 Middle AA section view;

[0035] Figure 4 for Figure 2 Middle BB section view;

[0036] Figure 5 It is a structural schematic diagram of the plug block in the present invention;

[0037] Figure 6 for Figure 5 Middle CC section view;

[0038] Figure 7 is a cross-sectional view of the support block in the present invention;

[0039] Figure 8 for Figure 7 Center D view.

[0040] Explanation of the accompanying numbers: 1. Base plate; 2. Positioning ring; 3. Nut; 4. Press hook; 5. Pillar; 5a. Radial slide groove; 6. Insert block; 6a. Ventilation duct; 6b. Notch; 6c. Sliding plug-in portion; 7. Support block; 7a. Support profile; 7b. Air cavity; 7c. Ventilation groove; 7d. Ear plate; 7e. Slot; 7f. Ventilation hole; 8. Sealing gasket; 9. Air nozzle; 10. Cover plate; 11. Hexagonal head clamping screw; 12. Support plate; 13. Cylindrical pin; 14. Positioning plug; 15. Angular latch; 16. Angular support. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiment of the present invention are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, in the embodiment of the present invention, the inner end refers to the end along the radial direction close to the central axis of the combustion chamber casing, and the outer end refers to the end along the radial direction close to the central axis of the combustion chamber casing. In this embodiment, "radial" refers to the radial direction of the combustion chamber casing.

[0043] Combination Figures 2 to 8As shown, a specific embodiment of a fixture for welding a mounting seat of a combustion chamber casing provided by the present invention is provided, and the fixture comprises a base plate 1, and a positioning ring 2 arranged on the top surface of the base plate 1; a positioning stop is arranged on the top surface of the positioning ring 2 for positioning the inner hole of the flange edge at the lower end of the combustion chamber casing; a plurality of pressing hooks 4 are evenly distributed near the edge position on the positioning ring 2; a plurality of pillars 5 are arranged on the top surface of the base plate 1, and a tightening jet device is arranged on the top of each pillar 5, which is used to tighten on the inner surface of the cylinder of the combustion chamber casing corresponding to the welding position of the mounting seat and spray inert gas onto the inner surface of the tightening position.

[0044] In this embodiment, the positioning ring 2 is positioned with the base plate 1 by means of a cylindrical pin 13, and then fixed to the base plate 1 by means of a cylindrical head hexagon socket screw. The size of the positioning stop on the positioning ring 2 is consistent with the size of the inner hole of the flange edge at the lower end of the combustion chamber casing, and the roundness of the positioning stop is Φ0.1mm.

[0045] In this embodiment, the screw of the pressing hook 4 passes through the edge plate on the upper part of the positioning ring and is screwed with a nut 3. When the pressing hook 4 needs to be locked, the nut 3 can be tightened.

[0046] In this embodiment, the number of mounting seats to be welded on the combustion chamber casing is 14, and 14 pillars 5 are provided accordingly. The number of pillars 5 is consistent with the number of mounting seats to be welded, that is, the top-tightening jet device on each pillar 5 can be pressed against the inner surface of the cylinder of the combustion chamber casing corresponding to the welding position of the mounting seat. Therefore, a set of clamps can be used to complete the welding of all mounting seats on the entire combustion chamber casing, which greatly improves the welding efficiency.

[0047] The top-tightening jet device includes an insert block 6, a support block 7 and a gas nozzle 9; a radial slot 5a is provided at the top of the pillar 5; the insert block 6 is slidably installed in the radial slot 5a, and the support block 7 is installed at the end of the insert block 6; a driving mechanism is provided on the pillar 5 for driving the insert block 6 to move on the radial slot 5a; the support block 7 has a support profile 7a, and the profile shape of the support profile 7a matches the shape of the inner profile supported on the combustion chamber casing barrel. An air cavity 7b is provided inside the support block 7; a ventilation groove 7c is provided on the support profile 7a, and the contour shape of the ventilation groove 7c is the same as the contour shape of the weld. The ventilation groove 7c is connected to the air cavity 7b through a plurality of ventilation holes 7f; a ventilation pipe 6a is provided inside the insert block 6, and the gas nozzle 9 is installed on the air inlet of the ventilation pipe 6a, and the air outlet of the ventilation pipe 6a is connected to the air cavity 7b of the support block 7; the gas nozzle 9 is connected to the argon gas source through an air pipe.

[0048] In this embodiment, the depth of the ventilation groove 7c is 5mm and the width is 8mm. The diameter of the ventilation hole 7f is φ2mm. In order to reduce the volume of the support block 7, the ventilation hole 7f can be perpendicular to the bottom of the ventilation groove 7c or inclined to the bottom of the ventilation groove 7c.

[0049] Combination Figure 3 As shown, the driving mechanism includes a hexagonal head clamping screw 11 and a support plate 12; a notch 6b is provided on the end of the plug block 6 away from the support block 7; the support plate 12 is fixedly mounted on the side of the pillar 5 by a cylindrical head hexagon socket screw, the hexagonal head clamping screw 11 is screwed on the support plate 12, and the hexagonal head clamping screw 11 passes through the support plate 12 and is clamped in the notch 6b of the plug block 6. When the hexagonal head clamping screw 11 is turned, the movement of the plug block 6 can be controlled.

[0050] Combination Figure 4 As shown, an angular support 16 is provided on the bottom plate 1. Specifically, the angular support 16 is connected to the bottom plate 1 by a cylindrical head hexagon socket screw to form a detachable connection structure. An angular latch 15 is inserted at the top of the angular support 16, and the inner side end of the angular latch 15 is used to be inserted into the angular hole of the combustion chamber casing.

[0051] Combination Figure 3 , Figure 6 As shown, an internal thread is provided on the air inlet of the ventilation pipe 6a, an external thread is provided on the outer cylindrical surface of the lower half of the air nozzle 9, and an annular boss is provided on the outer cylindrical surface of the middle part of the air nozzle 9; the lower half of the air nozzle 9 is threadedly connected with the air inlet of the ventilation pipe 6a; a sealing gasket 8 is provided between the annular boss of the air nozzle 9 and the plug 6 to ensure airtight sealing.

[0052] Combination Figure 3 , Figure 5 As shown, the radial slot 5a is a rectangular slot with a top and two open ends in the radial direction; a cover plate 10 is installed on the top of the pillar 5 by screws; the cover plate 10 and the radial slot 5a together form a rectangular through hole; the plug block 6 includes a sliding plug-in portion 6c, which is a quadrangular prism with a rectangular cross section; the sliding plug-in portion 6c is slidably inserted in the rectangular through hole formed by the cover plate 10 and the radial slot 5a. The radial slot 5a is set as a rectangular slot with a top and two open ends in the radial direction, and its purpose is to facilitate the installation of the plug block 6.

[0053] Combination Figure 3As shown, a positioning plug 14 is provided at the center of the bottom surface of the bottom plate 1; a stopper is provided on the top surface of the positioning plug 14 and inserted into the center hole of the bottom plate 1, and the positioning plug 14 is fixed to the bottom plate 1 by a cylindrical head hexagon socket screw. When the clamp is in use, the entire clamp is installed on the turntable of the welding workbench through the bottom plate 1. Therefore, the purpose of providing the positioning plug 14 is to facilitate positioning with the positioning hole on the turntable of the welding workbench, and the positioning plug 14 can be inserted into the positioning hole on the turntable.

[0054] Combination Figure 6 , Figure 7 As shown, two ear plates 7d are provided on the support block 7, and a slot 7e is formed between the two ear plates 7d; the end of the plug block 6 is inserted into the slot 7e formed by the two ear plates 7d, the plug block 6 seals the inner cavity of the support block 7, and the ear plate 7d and the plug block 6 are connected by a cylindrical head hexagon socket screw.

[0055] On the other hand, this embodiment also provides a method for welding a combustion chamber casing mounting seat, using the above-mentioned fixture, including the following steps:

[0056] S1. The entire fixture is mounted on the turntable of the welding workbench through the bottom plate 1, and the angle support 16 is removed from the bottom plate 1. The purpose of removing the angle support 16 is to prevent interference when the combustion chamber casing is installed into the fixture.

[0057] S2. Match the inner hole of the flange edge of the combustion chamber casing at its lower end with the positioning stop of the positioning ring 2, and press the pressing hook 4 onto the flange edge at the lower end of the combustion chamber casing. At this time, the pressing hook 4 is not locked first, that is, the nut 3 is not tightened first. At this time, the function of the pressing hook 4 is to hook the combustion chamber casing to prevent the combustion chamber casing from falling.

[0058] S3. Install the disassembled angular support 16 on the base plate 1, rotate the combustion chamber casing, and insert the angular latch 15 on the angular support 16 into the angular hole of the combustion chamber casing; tighten the nut 3 to lock the pressing hook 4 to press the flange edge at the lower end of the combustion chamber casing.

[0059] S4, connecting the gas nozzle 9 on the top-tightening jet device at the corresponding position of the mounting seat to be welded through the gas pipe to the argon gas source, and passing argon gas according to the parameters.

[0060] S5. Turn the hexagonal clamping screw 11 to push the insert block 6 to move radially outward, so that the support profile 7a of the support block 7 is pressed against the inner profile of the cylinder of the combustion chamber casing corresponding to the welding part of the mounting seat.

[0061] S6. Turn the turntable on the welding workbench to move the mounting base to be welded to a position where the welder can easily operate;

[0062] S7, adjust the welding machine according to the welding parameters and weld the mounting seat;

[0063] S8, repeat steps S4 to S7 to complete the welding of all mounting seats;

[0064] S9. After the combustion chamber casing cools down, turn the hexagonal clamping screw 11 to reset the top jet device; loosen the clamping hook 4, remove the angular support 16, and remove the welded combustion chamber casing from the fixture.

[0065] Before welding, the welding bottom holes on the combustion chamber casing barrel are ground, and all the bottom hole end faces and the area within 20mm along the hole edge are polished to remove the oxide scale; the mounting seat to be welded is repaired so that the mounting seat matches the welding bottom holes on the combustion chamber casing barrel, ensuring that the misalignment is no more than 0.3mm and the butt clearance is no more than 0.5mm.

[0066] In this embodiment, in step S7, the welding operation includes the following steps:

[0067] S701, positioning welding: Assemble the mounting seat, and perform positioning welding on the joint between the combustion chamber casing and the mounting seat. The welding parameters are: welding current 110-140A, argon gas flow rate 6-8L / min at the gas nozzle 9, and tungsten electrode diameter Φ1.6~Φ2mm.

[0068] S702, argon arc welding: argon arc welding mounting base, welding current 110-140A, argon gas flow rate 6-8L / min at nozzle 9, tungsten electrode diameter Φ1.6~Φ2mm.

[0069] In addition, in steps S701 and S702, the welding part of the outer side of the combustion chamber casing barrel also needs to be protected by introducing argon gas through the argon protection device provided by the welding gun, and the argon gas flow rate is 12 to 15 L / min.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A fixture for welding a combustion chamber casing mounting seat, characterized in that: The invention comprises a bottom plate (1) and a positioning ring (2) arranged on the top surface of the bottom plate (1); a positioning stop is arranged on the top surface of the positioning ring (2) for positioning the inner hole of the flange edge at the lower end of the combustion chamber casing; a plurality of pressing hooks (4) are evenly distributed near the edge of the positioning ring (2); a plurality of pillars (5) are arranged on the top surface of the bottom plate (1), and a tightening jet device is arranged at the top of each pillar (5) for tightening on the inner surface of the cylinder of the combustion chamber casing corresponding to the welding part of the mounting seat and spraying inert gas on the inner surface of the tightening part.

2. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 1, characterized in that: The top-tightening air-jet device comprises an insert block (6), a support block (7) and an air nozzle (9); a radial slide groove (5a) is arranged on the top of the pillar (5); the insert block (6) is slidably installed in the radial slide groove (5a), and the support block (7) is installed at the end of the insert block (6); a driving mechanism is arranged on the pillar (5) for driving the insert block (6) to move on the radial slide groove (5a); The support block (7) has a support profile (7a), and an air cavity (7b) is arranged inside the support block (7); a ventilation groove (7c) is arranged on the support profile (7a), and the ventilation groove (7c) and the air cavity (7b) are connected through a plurality of ventilation holes (7f); a ventilation pipe (6a) is arranged inside the plug block (6), and the air nozzle (9) is installed on the air inlet of the ventilation pipe (6a), and the air outlet of the ventilation pipe (6a) is connected to the air cavity (7b) of the support block (7); the air nozzle (9) is connected to an argon gas source through an air pipe.

3. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 2, characterized in that: The driving mechanism comprises a hexagonal clamping screw (11) and a support plate (12); a notch (6b) is provided on one end of the plug block (6) away from the support block (7); the support plate (12) is installed on the side of the pillar (5), the hexagonal clamping screw (11) is screwed on the support plate (12), and the hexagonal clamping screw (11) passes through the support plate (12) and the rear head is clamped in the notch (6b) of the plug block (6).

4. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 3, characterized in that: An angular support (16) is arranged on the bottom plate (1), an angular latch (15) is inserted on the top of the angular support (16), and the inner end of the angular latch (15) is used to be inserted into the angular hole of the combustion chamber casing.

5. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 2, characterized in that: An internal thread is provided on the air inlet of the ventilation pipe (6a), an external thread is provided on the outer cylindrical surface of the lower half of the air nozzle (9), and an annular boss is provided on the outer cylindrical surface of the middle part of the air nozzle (9); the lower half of the air nozzle (9) is threadedly connected to the air inlet of the ventilation pipe (6a); and a sealing gasket (8) is provided between the annular boss of the air nozzle (9) and the plug (6).

6. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 2, characterized in that: The radial slide groove (5a) is a rectangular groove with an open top and two radial ends; a cover plate (10) is installed on the top of the pillar (5) by screws; the cover plate (10) and the radial slide groove (5a) together form a rectangular through hole; the plug block (6) includes a sliding plug-in portion (6c), the sliding plug-in portion (6c) is a quadrangular prism with a rectangular cross-section; the sliding plug-in portion (6c) is slidably inserted in the rectangular through hole formed by the cover plate (10) and the radial slide groove (5a).

7. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 1, characterized in that: A positioning plug (14) is arranged at the center position of the bottom surface of the bottom plate (1); a stopper is arranged on the top surface of the positioning plug (14) and is inserted into the center hole of the bottom plate (1).

8. A fixture for welding a combustion chamber casing mounting seat as claimed in claim 2, characterized in that: Two ear plates (7d) are arranged on the support block (7), and a slot (7e) is formed between the two ear plates (7d); The end of the insert block (6) is inserted into a slot (7e) formed by two ear plates (7d), and the ear plates (7d) and the insert block (6) are connected via cylindrical head hexagon socket screws.

9. A method for welding a mounting seat of a combustion chamber casing, characterized in that: The clamp according to claim 4 comprises the following steps: S1. Install the entire fixture on the turntable of the welding workbench through the base plate (1), and remove the angle support (16) from the base plate (1); S2, match the combustion chamber casing with the positioning stop of the positioning ring (2) through the inner hole of the flange edge at the lower end thereof, and press the pressing hook (4) onto the flange edge at the lower end of the combustion chamber casing, at this time, the pressing hook (4) is not locked first; S3, install the removed angular support (16) on the bottom plate (1), rotate the combustion chamber casing, and insert the angular latch (15) on the angular support (16) into the angular hole of the combustion chamber casing; lock the pressing hook (4) to press the flange edge at the lower end of the combustion chamber casing; S4, connecting the gas nozzle (9) on the top-tightening jet assembly at the corresponding position of the mounting seat to be welded via a gas pipe to an argon gas source, and passing argon gas according to the parameters; S5. Turn the hexagonal clamping screw (11) to push the insert block (6) to move radially outward, so that the support profile (7a) of the support block (7) is pressed against the inner profile of the cylinder of the combustion chamber casing corresponding to the welding position of the mounting seat; S6. Turn the turntable to move the mounting base to be welded to a position where the welder can easily operate; S7, adjust the welding machine according to the welding parameters and weld the mounting seat; S8, repeat steps S4 to S7 to complete the welding of all mounting seats; S9. After the combustion chamber casing has cooled, turn the hexagonal clamping screw (11) to reset the top-tightening jet device; loosen the clamping hook (4), remove the angular support (16), and remove the welded combustion chamber casing from the fixture.

10. A method for welding a combustion chamber casing mounting seat as claimed in claim 10, characterized in that: Before welding, the welding bottom holes on the combustion chamber casing barrel are ground, and all the bottom hole end faces and the area within 20mm along the hole edge are polished to remove the oxide scale; the mounting seat to be welded is repaired so that the mounting seat matches the welding bottom holes on the combustion chamber casing barrel, ensuring that the misalignment is no more than 0.3mm and the butt clearance is no more than 0.5mm.

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