A clamp and method for welding a combustion chamber case mounting seat

Abstract

The present application relates to the technical field of aero-engine welding, and particularly relates to a clamp and method for welding and mounting a combustion chamber case welding mounting seat. The clamp comprises a base plate and a positioning ring arranged on the top surface of the base plate; the top surface of the positioning ring is provided with a positioning stop for positioning the inner hole of the lower end flange edge of the combustion chamber case; a plurality of pressing hooks are uniformly arranged on the positioning ring near the edge position; a plurality of support columns are arranged on the top surface of the base plate, and a jacking gas injection device is arranged on the top of each support column for jacking the inner profile surface of the welding part of the mounting seat on the cylinder of the combustion chamber case and injecting inert gas to the inner profile surface of the jacking part. The clamp and method provided by the present application effectively control the deformation of the combustion chamber case welding mounting seat, improve the stability of the product welding quality, and the welding clamp is simple and convenient to operate, the welding method is efficient, and the labor intensity of the operator is reduced.

Description

Technical Field

[0001] This invention relates to the field of aero-engine welding technology, and in particular to a fixture and method for welding a combustion chamber casing mounting base. Background Technology

[0002] Combination Figure 1 The diagram shown is a structural schematic of the combustion chamber casing. Various mounting brackets are welded onto the cylindrical body of the combustion chamber casing. Figure 1 In the diagram, a to j represent various types of mounting bases. The base material thickness at the weld joint of the mounting base is t = 2.7 mm. A large amount of heat is required to melt through the base material during welding. Therefore, the mounting base undergoes significant deformation when welded in its free state.

[0003] To reduce the deformation of the combustion chamber casing welded mounting base, the cylinder can be pre-deformed in the opposite direction of welding deformation. However, the pre-deformation method relies on the operator's skill level and experience, resulting in poor control of welding deformation, unstable product quality, and failure to meet subsequent machining requirements. In addition, the combustion chamber casing cylinder material is GH2150, which has high hardness and is not easy to pre-deform.

[0004] In contrast, welding the mounting base of the combustion chamber casing under a confined position is a superior method for controlling welding deformation. Studies have shown that using tooling in conjunction with a hydraulic press for mounting base welding effectively controls welding deformation and ensures stable product quality. For example, patent application CN109382624A discloses a welding tooling and welding method for aero-engine mounting bases, solving the problems of large, thin-walled aero-engine component mounting bases being unable to be welded under a confined position and the severe deformation of the mounting base after welding.

[0005] However, the method in CN109382624A requires multiple sets of tooling. After welding one mounting base, it is necessary to wait for the parts to cool down before changing to different tooling to weld other mounting bases. This results in high labor intensity for operators, complex welding process, and long waiting time. Summary of the Invention

[0006] The main objective of this invention is to provide a fixture and method for welding and mounting a combustion chamber casing, in order to solve the aforementioned technical problems.

[0007] To achieve the above objectives, the present invention provides a fixture for a combustion chamber casing welding mounting base, comprising a base plate and a positioning ring disposed on the top surface of the base plate; the top surface of the positioning ring is provided with a positioning stop for positioning the inner hole of the lower flange edge of the combustion chamber casing; multiple pressure hooks are evenly distributed on the positioning ring near the edge; several pillars are disposed on the top surface of the base plate, and a clamping jet device is disposed at the top of each pillar for clamping against the inner surface of the combustion chamber casing corresponding to the welding part of the mounting base and for injecting inert gas into the inner surface of the clamping part.

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

[0009] Preferably, the drive mechanism includes a hexagonal head clamping screw and a support plate; a slot is provided at one end of the insert block away from the support block; the support plate is installed on the side of the support column, the hexagonal head clamping screw is screwed onto the support plate, and the head of the hexagonal head clamping screw is engaged in the slot of the insert block after passing through the support plate.

[0010] Preferably, an angular support is provided on the base plate, and an angular pin is inserted into the top of the angular support. The inner end of the angular pin is used to insert into the angular hole of the combustion chamber casing.

[0011] Preferably, an internal thread is provided on the air inlet of the ventilation pipe, 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 in the middle of the air nozzle; the lower half of the air nozzle is threadedly connected to the air inlet of the ventilation pipe; and a sealing gasket is provided between the annular boss of the air nozzle and the insert block.

[0012] Preferably, the radial groove is a rectangular groove with an open top and two radial ends; a cover plate is installed at the top of the support column by screws; the cover plate and the radial groove together form a rectangular through hole; the insert includes a sliding insertion part, which is a quadrangular prism with a rectangular cross-section; the sliding insertion part is slidably inserted into the rectangular through hole formed by the cover plate and the radial groove.

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

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

[0015] The end of the insert is inserted into the slot formed by the two ear plates, and the ear plates and the insert are connected by cylindrical head hexagonal screws.

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

[0017] S1. Mount the entire fixture onto the turntable of the welding workbench via the base plate, and remove the angular support from the base plate.

[0018] S2. Connect the combustion chamber casing to the positioning stop of the positioning ring through the inner hole of the flange at its lower end, and press the pressure hook onto the flange at the lower end of the combustion chamber casing. Do not lock the pressure hook at this time.

[0019] S3. Install the disassembled angular support on the base plate, rotate the combustion chamber casing to insert the angular pin on the angular support into the angular hole of the combustion chamber casing; tighten the locking hook to press the flange edge at the lower end of the combustion chamber casing.

[0020] S4. Connect the nozzle of the top-tightening jet device at the corresponding position of the mounting base to be welded to the argon gas source through the gas pipe, and supply argon gas according to the parameters.

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

[0022] S6. Rotate the turntable to move the mounting base to be welded to a position that is easy for the welder to operate;

[0023] S7. Adjust the welding machine according to the welding parameters and weld the mounting base;

[0024] S8. Repeat steps S4 to S7 to complete the welding of all mounting bases;

[0025] S9. After the combustion chamber casing has cooled down, turn the hexagonal head 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 holes on the combustion chamber casing are ground, and all bottom hole end faces and within 20mm along the hole edge are polished to remove oxide scale; the mounting base to be welded is repaired so that the mounting base matches the welding bottom holes on the combustion chamber casing, ensuring that the misalignment is no more than 0.3mm and the butt gap is no more than 0.5mm.

[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 have several pillars on the top surface of the base plate, and a clamping jet device is provided on the top of each pillar. This device clamps the fixture against the inner surface of the combustion chamber casing corresponding to the welding part of the mounting seat and sprays inert gas onto the inner surface of the clamping part. This effectively controls the deformation of the welding mounting seat of the combustion chamber casing, improves the stability of the product welding quality, and the welding fixture is simple and convenient to operate. The welding method is efficient and reduces the labor intensity of the operator.

[0029] (2) In this invention, several pillars are provided on the top surface of the base plate, and a clamping jet device is provided on the top of each pillar. Specifically, the number of pillars is consistent with the number of mounting seats to be welded. That is, the clamping jet device on each pillar can clamp onto the inner surface of the combustion chamber casing corresponding to the welding part of the mounting seat. Therefore, the welding of all mounting seats on the entire combustion chamber casing can be completed by using a set of fixtures, which greatly improves the welding efficiency.

[0030] (3) In this invention, when welding, the entire fixture is mounted on the turntable of the welding workbench through the base plate. During the welding operation, the turntable is rotated to achieve welding of mounting seats at different angles. During the welding process, the welding torch will not interfere with the mounting seat. Attached Figure Description

[0031] 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.

[0032] Figure 1 A schematic diagram of the combustion chamber casing after the mounting bracket welding is completed;

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

[0034] Figure 3 for Figure 2 Sectional view of AA;

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

[0036] Figure 5 This is a schematic diagram of the insert block in the present invention;

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

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

[0039] Figure 8 for Figure 7 View from D direction.

[0040] Explanation of reference numerals: 1. Base plate; 2. Positioning ring; 3. Nut; 4. Press hook; 5. Support column; 5a. Radial groove; 6. Insert block; 6a. Ventilation pipe; 6b. Groove; 6c. Sliding insertion part; 7. Support block; 7a. Support profile; 7b. Air cavity; 7c. Ventilation groove; 7d. Ear plate; 7e. Slot; 7f. Ventilation hole; 8. Sealing washer; 9. Air nozzle; 10. Cover plate; 11. Hexagonal head clamping screw; 12. Support plate; 13. Cylindrical pin; 14. Positioning plug; 15. Angular pin; 16. Angular support. Detailed Implementation

[0041] 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.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in this embodiment of the invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, in this embodiment of the invention, the inner end refers to the end radially closer to the central axis of the combustion chamber casing, and the outer end refers to the end radially away from 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 8The image shows a specific embodiment of a fixture for a combustion chamber casing welding mounting base provided by the present invention. The fixture includes a base plate 1 and a positioning ring 2 disposed on the top surface of the base plate 1. A positioning stop is provided on the top surface of the positioning ring 2 for positioning the inner hole of the lower flange edge of the combustion chamber casing. Multiple pressure hooks 4 are evenly distributed near the edge of the positioning ring 2. Several support columns 5 are provided on the top surface of the base plate 1, and a clamping jet device is provided on the top of each support column 5 for clamping against the inner surface of the combustion chamber casing corresponding to the welding part of the mounting base and for spraying inert gas onto the inner surface of the clamping part.

[0044] In this embodiment, the positioning ring 2 is positioned to the base plate 1 by a cylindrical pin 13, and then fixed to the base plate 1 using a cylindrical head hexagonal screw. The positioning stop on the positioning ring 2 has the same size as the inner hole size of the flange 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 pressure hook 4 passes through the upper edge plate of the positioning ring and is screwed with a nut 3. When it is necessary to lock the pressure hook 4, simply tighten the nut 3.

[0046] In this embodiment, 14 mounting seats need to be welded onto the combustion chamber casing, corresponding to 14 support pillars 5. The number of support pillars 5 is the same as the number of mounting seats to be welded, that is, the clamping jet device on each support pillar 5 can clamp onto the inner surface of the combustion chamber casing corresponding to the welding part of the mounting seat. Therefore, a single set of fixtures can be used to complete the welding of all mounting seats on the entire combustion chamber casing, greatly improving welding efficiency.

[0047] The top-mounted jet device includes an insert block 6, a support block 7, and a nozzle 9. A radial groove 5a is provided on the top of the support column 5. The insert block 6 is slidably installed in the radial groove 5a, and the support block 7 is installed at the end of the insert block 6. A drive mechanism is provided on the support column 5 to drive the insert block 6 to move on the radial groove 5a. The support block 7 has a support surface 7a, the shape of which matches the shape of the inner surface supported on the combustion chamber casing. A gas chamber 7b is provided inside the support block 7. A venting groove 7c is provided on the support surface 7a, the outline of which is the same as the weld outline. The venting groove 7c and the gas chamber 7b are connected by multiple venting holes 7f. A venting pipe 6a is provided inside the insert block 6, and the nozzle 9 is installed on the inlet of the venting pipe 6a. The outlet of the venting pipe 6a is connected to the gas chamber 7b of the support block 7. The nozzle 9 is connected to an argon gas source through a gas pipe.

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

[0049] Combination Figure 3 As shown, the driving mechanism includes a hexagonal head clamping screw 11 and a support plate 12; a slot 6b is provided at the end of the insert 6 away from the support block 7; the support plate 12 is fixedly installed on the side of the support column 5 by a cylindrical head hexagonal screw, the hexagonal head clamping screw 11 is screwed onto the support plate 12, and the head of the hexagonal head clamping screw 11 is engaged in the slot 6b of the insert 6 after passing through the support plate 12. Rotating the hexagonal head clamping screw 11 can control the movement of the insert 6.

[0050] Combination Figure 4 As shown, an angular support 16 is provided on the base plate 1. Specifically, the angular support 16 is connected to the base plate 1 by a cylindrical head hexagon socket screw, forming a detachable connection structure. An angular pin 15 is inserted into the top of the angular support 16, and the inner end of the angular pin 15 is used to insert 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 to 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 insert block 6 to ensure a tight seal and prevent air leakage.

[0052] Combination Figure 3 , Figure 5 As shown, the radial 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 support column 5 by screws; the cover plate 10 and the radial groove 5a together form a rectangular through hole; the insert 6 includes a sliding insertion part 6c, which is a quadrangular prism with a rectangular cross-section; the sliding insertion part 6c is slidably inserted into the rectangular through hole formed by the cover plate 10 and the radial groove 5a. The purpose of setting the radial groove 5a as a rectangular groove with an open top and two radial ends is to facilitate the installation of the insert 6.

[0053] Combination Figure 3As shown, a positioning plug 14 is provided at the center of the bottom surface of the base plate 1; the top surface of the positioning plug 14 is provided with a stop and is inserted into the center hole of the base plate 1. The positioning plug 14 is fixed to the base plate 1 with a cylindrical head hexagon socket screw. When the fixture is in use, the entire fixture is mounted on the turntable of the welding workbench through the base 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, which is achieved by inserting the positioning plug 14 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 groove 7e is formed between the two ear plates 7d; the end of the insert block 6 is inserted into the groove 7e formed by the two ear plates 7d, the insert block 6 seals the inner cavity of the support block 7, and the ear plates 7d and the insert block 6 are connected by cylindrical head hexagonal screws.

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

[0056] S1. Mount the entire fixture onto the turntable of the welding workbench via the base plate 1, and remove the angular support 16 from the base plate 1. The purpose of removing the angular support 16 is to prevent interference when the combustion chamber casing is installed into the fixture.

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

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

[0059] S4. Connect the nozzle 9 of the top-tightening jet device at the corresponding position of the mounting base to the argon gas source through the gas pipe, and supply argon gas according to the parameters.

[0060] S5. Rotate the hexagonal head clamping screw 11 to push the insert 6 to move radially outward, so that the support surface 7a of the support block 7 presses against the inner surface of the combustion chamber casing corresponding to the welding part of the mounting seat.

[0061] S6. Rotate the turntable on the welding workbench to move the mounting base to be welded to a position that is easy for the welder to operate.

[0062] S7. Adjust the welding machine according to the welding parameters and weld the mounting base;

[0063] S8. Repeat steps S4 to S7 to complete the welding of all mounting bases;

[0064] S9. After the combustion chamber casing has cooled down, turn the hexagonal head 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 are ground, and all bottom hole end faces and within 20mm along the edge of the hole are polished to remove oxide scale; the mounting base to be welded is repaired so that the mounting base matches the welding bottom holes on the combustion chamber casing, ensuring that the misalignment is no more than 0.3mm and the butt gap is no more than 0.5mm.

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

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

[0069] In addition, in steps S701 and S702, the welding area on the outer side of the combustion chamber casing also needs to be protected by argon gas through the argon gas protection device on the welding torch, with an argon gas flow rate of 12-15 L / min.

[0070] 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 and mounting a combustion chamber casing, characterized in that, The utility model relates to a kind of combustion chamber machine housings, including bottom plate (1), and the positioning ring (2) being set on the top surface of bottom plate (1);The top surface of positioning ring (2) is provided with positioning stop for the positioning of the inner hole of combustion chamber machine housings lower end flange edge;Multiple press hooks (4) are uniformly distributed on the edge position of positioning ring (2);Several struts (5) are provided on the top surface of the bottom plate (1), and the top of each strut (5) is provided with a top-tight jet device for being tightly pressed on the inner profile of the corresponding mounting seat welding part on the cylinder of combustion chamber machine housings and injecting inert gas to the inner profile of the top-tight part;The number of struts (5) is consistent with the number of mounting seats to be welded, that is, the top-tight jet device on each strut (5) can be tightly pressed on the inner profile of the corresponding mounting seat welding part on the cylinder of combustion chamber machine housings; The top-tight jet device includes an insertion block (6), a support block (7) and a gas nozzle (9);A radial sliding groove (5a) is provided on the top of the strut (5);The insertion block (6) is slidingly installed in the radial sliding groove (5a), and the support block (7) is installed at the end of the insertion block (6);A driving mechanism is provided on the strut (5) for driving the insertion block (6) to move on the radial sliding groove (5a); The support block (7) has a support surface (7a), and a gas cavity (7b) is provided inside the support block (7);An air passage (7c) is provided on the support surface (7a), and the air passage (7c) is in communication with the gas cavity (7b) through multiple air holes (7f);An air passage (6a) is provided inside the insertion block (6), the gas nozzle (9) is installed on the gas inlet of the air passage (6a), and the gas outlet of the air passage (6a) is in communication with the gas cavity (7b) of the support block (7);The gas nozzle (9) is connected to an argon gas source through an air pipe.

2. A fixture for welding a mounting bracket to a combustion chamber case according to claim 1, characterized in that: The driving mechanism includes a hexagonal head compression screw (11) and a support plate (12);A notch (6b) is provided at the end of the insertion block (6) away from the support block (7);The support plate (12) is installed on the side surface of the strut (5), the hexagonal head compression screw (11) is screwed on the support plate (12), and the head of the hexagonal head compression screw (11) is clamped in the notch (6b) of the insertion block (6) after passing through the support plate (12).

3. A fixture for welding a mounting pad to a combustor case as defined in claim 2, wherein: An angular support (16) is provided on the bottom plate (1), an angular bolt (15) is inserted on the top of the angular support (16), and the inner side end of the angular bolt (15) is used for inserting into the angular hole of the combustion chamber machine housing.

4. A fixture for welding a mounting bracket to a combustion chamber case according to claim 1, characterized in that: An internal thread is provided on the gas inlet of the air passage (6a), an external thread is provided on the outer cylindrical surface of the lower half of the gas nozzle (9), and an annular boss is provided on the outer cylindrical surface of the middle part of the gas nozzle (9);The lower half of the gas nozzle (9) is threadedly connected with the gas inlet of the air passage (6a);A sealing washer (8) is provided between the annular boss of the gas nozzle (9) and the insertion block (6).

5. A fixture for welding a mounting bracket to a combustion chamber case as set forth in claim 1, characterized in that: The radial sliding slot (5a) is a rectangular slot with open top end and two radial ends; a cover plate (10) is installed on the top end of the support column (5) by screws; the cover plate (10) and the radial sliding slot (5a) jointly form a rectangular through hole; the plug-in block (6) comprises a sliding plug-in part (6c) which is a quadrangular prism with a rectangular cross section; the sliding plug-in part (6c) is slidingly inserted into the rectangular through hole jointly formed by the cover plate (10) and the radial sliding slot (5a).

6. A fixture for welding a mounting bracket to a combustion chamber case as set forth 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); the top surface of the positioning plug (14) is provided with a stop opening and is inserted into the center hole of the bottom plate (1).

7. A fixture for welding a mounting bracket to a combustion chamber case as set forth in claim 1, characterized in that: Two ear plates (7d) are arranged on the support block (7), and a clamping slot (7e) is formed between the two ear plates (7d); The end of the plug-in block (6) is inserted into the clamping slot (7e) formed by the two ear plates (7d), and the ear plates (7d) and the plug-in block (6) are connected by a cylindrical head internal hexagonal screw.

8. A method of welding a mounting block to a combustion chamber case, characterized by, The clamp of claim 3 comprises the following steps: S1, install the entire clamp on the rotating disc of the welding workbench through the bottom plate (1), and detach the angular support (16) from the bottom plate (1); S2, cooperate the inner hole of the flange edge at the lower end of the combustion chamber casing with the positioning stop opening of the positioning ring (2), press the pressure hook (4) on the flange edge at the lower end of the combustion chamber casing, and do not lock the pressure hook (4) at this time; S3, install the detached angular support (16) on the bottom plate (1), rotate the combustion chamber casing, and insert the angular plug-in pin (15) on the angular support (16) into the angular hole of the combustion chamber casing; lock the pressure hook (4) to press the flange edge at the lower end of the combustion chamber casing; S4, connect the air nozzle (9) on the jacking air jet device at the corresponding position of the to-be-welded mounting seat to the argon gas source through the air pipe, and pass argon gas according to the parameters; S5, rotate the hexagonal head jacking screw (11), push the plug-in block (6) to move outward along the radial direction, and make the supporting profile (7a) of the support block (7) jacked on the inner profile of the cylinder of the combustion chamber casing corresponding to the mounting seat welding part; S6, rotate the rotating disc to turn the to-be-welded mounting seat to a position easy for the welder to 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 cools down, rotate the hexagonal head jacking screw (11) to reset the jacking air jet device; loosen the pressure hook (4), detach the angular support (16), and take down the welded combustion chamber casing from the clamp.

9. A method of welding a mounting pad to a combustor can as defined in claim 8, wherein, Before welding, polish the welding bottom hole on the cylinder of the combustion chamber casing, polish the end surface and the 20mm range along the hole edge of all bottom holes to remove the oxide skin; repair the to-be-welded mounting seat to make the mounting seat cooperate with the welding bottom hole on the cylinder of the combustion chamber casing, ensure that the misalignment is not greater than 0.3mm, and the butt gap is not greater than 0.5mm.

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