An adjustable welding and installation tooling for the quench ring of a gasifier and its usage method

Abstract

The present invention discloses an adjustable welding fixture for a gasification furnace quench ring, comprising a center disk and several radial support tubes fixedly connected to the center disk; the outer ends of the support tubes are fixedly connected with connecting nuts, the connecting nuts are connected with adjusting screws, the adjusting screws are provided with adjusting nuts, the axial outer ends of the adjusting screws are provided with annular grooves and placed in the axial limiting holes of their respective support blocks, the support blocks are connected with pins, the outer ends of the support blocks are fixedly connected with pressure blocks, the outer ends of the pressure blocks are provided with notches, the outer ends of the support blocks are provided with an upper concave arc surface, a middle groove and a lower concave arc surface in sequence, and the support blocks are connected to the same bottom ring plate through longitudinal screws; the present invention also discloses a method for using the welding fixture. The present invention can effectively release residual stress during the quench ring welding process, ensure uniform water film gap of the product, improve product performance and life, facilitate assembly and disassembly, and improve production efficiency and material utilization.

Description

Technical Field

[0001] The invention relates to a welding tool and a use method, in particular to an adjustable welding tool for a quenching ring of a gasifier and a use method. Background Art

[0002] Gasifier quench ring is a key component of the gasifier, such as Figure 1 、 Figure 2 The structure shown is primarily composed of a quench ring cavity housing 19, an inner ring tube 20, an upper half ring tube 21, a lower half ring tube 22 pre-welded with steel balls 23, a quench cylinder 24, and a retaining ring 27. The quench ring cavity housing 19 is equipped with a flange 25 and several bolt holes 26. The dimensional accuracy of the gap between the lower half ring tube 22 and the quench cylinder 24 (i.e., the gap at the steel balls 23, also known as the water film gap) is directly related to the uniformity of the quenching water film during the quenching ring's operation, significantly impacting its performance and service life. To ensure the uniformity of the water film gap, the most commonly used method currently involves adjusting the gap before welding and securing it with a stiffening plate before welding each weld. This presents the following problems:

[0003] (1) In order to ensure the uniform size of the gap between the chilling ring water film, it is often necessary to install and weld a large number of tie plates between the lower half ring tube and the chilling cylinder. The workload of assembly, welding, dismantling and grinding is very large, and the tie plates cannot be reused after dismantling, resulting in low material utilization rate;

[0004] (2) The grinding area after the steel reinforcement plate is removed is uneven, which affects the surface forming quality of the chilled ring;

[0005] (3) The welding connection of the stiffener plate is a rigid connection. Due to the large shrinkage of nickel-based alloy welding, it is not conducive to the release of welding residual stress during welding. After welding, there is a high welding residual stress. After removing the stiffener plate, the stress release will cause the water film gap size deviation, resulting in uneven gap, affecting the product performance and life. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and to provide an adjustable welding fixture and method for the gasification furnace quench ring, which can effectively release the residual stress during the quench ring welding process, ensure the uniformity of the water film gap of the product, improve the product's performance and life, and facilitate assembly and disassembly, thereby improving production efficiency and material utilization.

[0007] In order to achieve the above-mentioned purpose, the gasification furnace quenching ring adjustable welding tool of the present invention includes a center disk and several radial support tubes fixedly connected to the center disk; it is characterized in that: the outer end of each support tube is fixedly connected with a connecting nut, and the connecting nuts are connected with their own adjusting screws, and the adjusting screws are provided with adjusting nuts, and the axial outer ends of the adjusting screws are provided with annular grooves and placed in the axial limiting holes of their respective support blocks, and the support blocks are connected with more than two pins, one end of the pins is located in the annular grooves of the corresponding adjusting screws, and the outer ends of the support blocks are fixedly connected with pressure blocks, and the outer ends of the pressure blocks are provided with notches, and the outer ends of the support blocks below the pressure blocks are provided with upper concave arc surfaces, middle grooves and lower concave arc surfaces in sequence, and the support blocks are connected to the longitudinal screws below them through threads, and each longitudinal screw passes through the same bottom ring plate.

[0008] The method for using the above-mentioned adjustable welding fixture for the quenching ring of a gasifier comprises the following steps: A) assembling the quenching ring cavity box and the quenching cylinder, and fixing them with spot welding; the method is characterized in that: B) removing each longitudinal screw and the bottom ring plate, placing the center plate, each support tube, each adjusting screw, and each support block in the quenching cylinder, placing each pressing block on the flange of the quenching ring cavity box, tightening and fixing the pressing block and the flange by several bolts and lock nuts passing through the notches of the pressing block and the bolt holes of the flange, adjusting the extension length of each adjusting screw so that each support block presses against the inner wall of the quenching cylinder, and adjusting Tighten the adjusting screw with the nut, and then weld the circumferential fillet weld between the lower end of the quenching ring cavity box and the quenching cylinder; C) Remove the center disk, each support tube, each adjusting screw, each support block and each pressure block, and weld the inner ring tube to the inner wall of the quenching cylinder; D) Test-install the upper half of the quenching ring tube and the lower half of the ring tube pre-welded with steel balls, spot weld the two, and then spot weld the joint between the upper half of the ring tube and the quenching ring cavity box; E) Place the retaining ring in the middle groove of each support block, place the center disk, each support tube, each adjusting screw, each support block in the quenching cylinder, and each pressure block on the flange of the quenching ring cavity box On the top, the pressing block is connected to the flange through several bolts and locking nuts that pass through the notches of the pressing block and the bolt holes of the flange, and the protruding length of each adjusting screw is adjusted so that the upper concave arc surface and the lower concave arc surface of each support block are respectively pressed against the upper half ring tube and the lower half ring tube to ensure that the gap between each steel ball and the quenching cylinder is uniform, and the adjusting screw is locked by the adjusting nut, and then the locking nut on the bolt is tightened, and then each longitudinal screw is passed through the bottom ring plate and connected to each support block. By adjusting each longitudinal screw, the flange and the upper end annular surface of the upper half ring tube are kept flat, and the upper half ring tube and the quenching annular cavity box are welded. F) Remove the longitudinal screws, bottom ring plate, several bolts and lock nuts passing through the notches of the pressure block and the bolt holes of the flange, readjust the adjusting screws so that the upper and lower concave arc surfaces of each support block respectively press against the upper and lower half ring tubes to ensure a uniform gap between each steel ball and the quenching cylinder, and then weld the butt joints between the upper and lower half ring tubes; G) Install and weld the fillet welds between the retaining ring and the upper and lower half ring tubes. If the water film gap size deviation occurs in some areas during the welding process, repeatedly adjust the adjusting screws to ensure a uniform gap between the steel ball and the quenching cylinder;

[0009] The present invention adopts adjustable support blocks and pressure blocks, and non-rigid connection supports are adopted between each support block and the quenching cylinder, the upper half ring tube and the lower half ring tube, which is conducive to the release of welding residual stress during welding. At the same time, each support block and each pressure block are adjusted by a telescopic adjusting screw, and the water film gap size can be controlled during welding. The gap size can be ensured to meet the requirements and uniformity by adjusting the length of the adjusting screw in time, thereby improving the performance and service life of the product. At the same time, there is no welding between the various parts of the tool and the quenching ring, which is convenient for assembly and disassembly and reuse, and can improve production efficiency and material utilization, thereby saving tool welding and disassembly time and tool manufacturing cost. In addition, the radial processing range of the tool is adjustable within a certain size, which can be applicable to quenching ring welding of different sizes, has a wide range of applications, and can greatly save the material and processing cost of repeated tool manufacturing.

[0010] As a further improvement of the present invention, the upper end surface of the bottom ring plate is provided with an annular groove located outside each longitudinal screw; accordingly, in step E), when each longitudinal screw is passed through the bottom ring plate and connected to each support block, the lower end of the quenching cylinder is placed in the annular groove on the upper end surface of the bottom ring plate; this ensures the cylindricity of the quenching cylinder, and when adjusting each longitudinal screw, the quenching cylinder can firmly support the bottom ring plate, and each support block presses the upper half annular tube, ensuring that the flange and the upper end annular surface of the upper half annular tube remain flat;

[0011] As a further improvement of the present invention, when welding the circumferential fillet weld between the lower end of the quenching annular cavity box and the quenching cylinder, welding the inner annular tube on the inner wall of the quenching cylinder, welding the weld between the upper half annular tube and the quenching annular cavity box, welding the butt joint between the upper half annular tube and the lower half annular tube, and welding the fillet welds between the retaining ring and the upper and lower half annular tubes, alternating and symmetrical welding is adopted to facilitate controlling welding deformation;

[0012] As a further improvement of the present invention, when welding the weld between the upper semi-annular tube and the quenching annular cavity box, welding the butt joint between the upper semi-annular tube and the lower semi-annular tube, and welding the fillet welds between the retaining ring and the upper and lower semi-annular tubes, the interference areas within each support block are not welded temporarily, and the welding of the non-interference areas is completed first. Then, after the product cools to room temperature, several bolts, locking nuts and support blocks are loosened, and each pressing block and each support block are rotated to a certain position to expose the original interference area, and then the original interference areas are welded alternately and symmetrically until all parts are welded. When each support block is pressed tightly against the upper semi-annular tube and the lower semi-annular tube, the welding operation in the interference area is inconvenient, which affects the welding quality. After each pressing block and each support block are rotated to a certain position to expose the original interference area, the original interference area is welded alternately and symmetrically, which can improve the welding quality.

[0013] As a further improvement of the present invention, each longitudinal screw rod passes through its own waist-shaped hole in the same bottom ring plate; this facilitates adjustment of the position of the longitudinal screw rod and facilitates connection with the support block;

[0014] As a further improvement of the present invention, the axial limiting hole is a blind hole or a stepped hole; when the adjusting screw is rotated, the support block can be pushed axially outward;

[0015] As a further improvement of the present invention, the adjusting screw outside the adjusting nut is fixedly connected with a rotating nut to facilitate the rotation of the adjusting screw;

[0016] In summary, the present invention can effectively release the residual stress during the quench ring welding process, ensure the uniformity of the water film gap of the product, improve the performance and life of the product, facilitate assembly and disassembly, and improve production efficiency and material utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main view of the existing gasifier quench ring.

[0018] Figure 2 for Figure 1 A partial enlarged view of .

[0019] Figure 3 This is a front view of an embodiment of the adjustable welding fixture for the gasification furnace quenching ring of the present invention.

[0020] Figure 4 for Figure 3 Top view of .

[0021] Figure 5 for Figure 4 Front view of the bottom ring plate in .

[0022] Figure 6 for Figure 5 AA enlarged cross-section.

[0023] Figure 7 for Figure 4 Enlarged view of point B.

[0024] Figure 8 This is a front view of the working state 1 of the welding tool usage method of the present invention.

[0025] Figure 9 This is a front view of the second working state of the welding tool usage method of the present invention.

[0026] Figure 10 This is a front view of the third working state of the welding tool usage method of the present invention.

[0027] Figure 11 This is a front view of the fourth working state of the welding tool usage method of the present invention.

[0028] Figure 12 This is a front view of the fifth working state of the welding tool usage method of the present invention.

[0029] Figure 13 This is a front view of the sixth working state of the welding tool usage method of the present invention.

[0030] Figure 14 This is a front view of the working state 7 of the welding tool usage method of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and examples.

[0032] like Figures 3 to 7 As shown, the gasification furnace quenching ring adjustable welding fixture of this embodiment includes a center disk 1 and eight radial support tubes 2 welded and fixedly connected to the center disk; the outer end of each support tube 2 is welded and fixedly connected with a connecting nut 3, and the connecting nut 3 is connected to its own adjusting screw 4 through a thread, and the adjusting screw 4 is provided with an adjusting nut 5 through a thread, and the adjusting screw 4 outside the adjusting nut 5 is welded and fixedly connected with a rotating nut 6, and the axial outer end of the adjusting screw 4 is provided with an annular groove and placed in a blind hole 8 of each support block 7 as an axial limit hole, and the support block 7 is threaded There are two pins 9 connected, one end of the pin 9 is located in the annular groove of the corresponding adjusting screw 4, the outer end of the support block 7 is welded and fixed with a pressure block 10, the outer end of the pressure block 10 is provided with a notch 11, the outer end of the support block 7 below the pressure block 10 is provided with an upper concave arc surface 12, a middle groove 13 and a lower concave arc surface 14 in sequence, the support blocks 7 are connected to the longitudinal screw 15 below each through a thread, and each longitudinal screw 15 passes through its own waist-shaped hole 17 in the same bottom ring plate 16, and the upper end surface of the bottom ring plate 16 is provided on the annular groove 18 located on the outside of each longitudinal screw 15.

[0033] The method for using the above-mentioned gasification furnace quench ring adjustable welding tool comprises the following steps: A) Figure 8 As shown, the chilling annular cavity box 19 and the chilling cylinder 24 are assembled and fixed by spot welding; during assembly, the chilling annular cavity box 19 is supported by a support, and the chilling cylinder 24 is connected to the chilling annular cavity box 19 by hoisting; B) as shown Figure 9 As shown, the longitudinal screws 15 and the bottom ring plate 16 on the tooling are removed, and the connected center disk 1, the support tubes 2, the adjusting screws 4, and the support blocks 7 are placed in the quenching cylinder 24. The pressure blocks 10 are placed on the flange 25 of the quenching annular cavity box 19. The pressure blocks 10 are tightened and fixed to the flange 25 by several bolts 28 and lock nuts 29 passing through the notches 11 of the pressure blocks 10 and the bolt holes of the flange 25. By rotating the rotation nuts 6 and adjusting the extension length of the adjusting screws 4, the support blocks 7 are pressed against the inner wall of the quenching cylinder 24. The adjusting screws 4 are locked by the adjusting nuts 5. Then, the circumferential fillet welds 30 between the lower end of the quenching annular cavity box 19 and the quenching cylinder 24 are welded alternately and symmetrically; C) As shown Figure 10As shown, the center plate 1, each support tube 2, each adjusting screw 4, each support block 7 and each pressing block 10 are removed, and the inner ring tube 20 is welded alternately and symmetrically on the inner wall of the quenching cylinder 24; D) Figure 11 As shown, the upper half ring tube 21 of the quenching ring and the lower half ring tube 22 pre-welded with steel balls 23 are assembled and spot welded to fix them. Then, the upper half ring tube 21 is spot welded to the quenching ring cavity box 19; E) Figure 12 As shown, the retaining ring 27 is placed in the central groove 13 of each support block 7, the connected center disk 1, each support tube 2, each adjusting screw 4, and each support block 7 are placed in the quenching cylinder 24, and each pressing block 10 is placed on the flange 25 of the quenching ring cavity box 19. Several bolts 28 and lock nuts 29 are passed through the notches of each pressing block 10 and the bolt holes of the flange 25 to connect each pressing block 10 with the flange 25. The extension length of each adjusting screw 4 is adjusted so that the upper concave arc surface and the lower concave arc surface of each support block 7 are respectively tightened against the upper half ring tube 21 and the lower half ring tube 22 to ensure that the gap between each steel ball 23 and the quenching cylinder 24 is uniform, and Tighten the adjusting screw 4 with the adjusting nut 5, then tighten the locking nut 29 on the bolt 28, then pass each longitudinal screw 15 through the bottom ring plate 16 and connect it to each support block 7, place the lower end of the quenching cylinder 24 in the annular groove 18 on the upper end surface of the bottom ring plate 16, and press the upper half annular tube 21 by adjusting each longitudinal screw 15 and each support block 7 so that the flange 25 and the upper end annular surface of the upper half annular tube 21 remain flat, alternately and symmetrically weld the welds 31 between the upper half annular tube 21 and the quenching annular cavity box 19 and in the non-interference area outside each support block 7, and leave the welds 31 in the interference area inside each support block 7 unwelded for the time being; F) As shown in FIG. Figure 13 As shown, the longitudinal screws 15, the bottom ring plate 16, the several bolts 28 and the lock nuts 29 are removed, and the adjusting screws 4 are readjusted so that the upper concave arc surface 12 and the lower concave arc surface 14 of each support block 7 are respectively pressed against the upper half ring tube 21 and the lower half ring tube 22 to ensure that the gap between each steel ball 23 and the quenching cylinder 24 is uniform. Then, the butt joints 32 between the upper half ring tube 21 and the lower half ring tube 22 and located in the non-interference area outside each support block 7 are alternately and symmetrically welded. The butt joints 32 located in the interference area inside each support block 7 are not welded for the time being; G) As shown in FIG. Figure 14 As shown, fillet welds 33 in the non-interference area between the retaining ring 27 and the upper and lower half-ring tubes 21 and 22 and located outside each support block 7 are welded alternately and symmetrically, and fillet welds 33 in the interference area inside each support block 7 are not welded temporarily; if the water film gap size deviation occurs in some areas during the welding process, the adjusting screw 4 is repeatedly adjusted to ensure that the gap between the steel ball 23 and the quenching cylinder 24 is uniform; H) After the product cools to room temperature, several bolts 28, lock nuts 29 and each support block 7 are loosened, and each pressing block 10 and each support block 7 are rotated to a certain position to expose the original interference area, and then the welds 31, butt joints 32 and fillet welds 33 in the original interference area are welded alternately and symmetrically until all parts are welded;

[0034] The present invention cooperates with the adjusting screw 4 through the connecting nut 3, rotates each adjusting screw 4, and the axial outer end of the adjusting screw 4 pushes each supporting block 7 to move axially outward in the blind hole 8 serving as a limiting hole, thereby forming adjustable supporting blocks 7 and pressing blocks 10. During welding, each supporting block 7 and the quenching cylinder 24, the upper semi-annular tube 21 and the lower semi-annular tube 22 are connected and supported by non-rigid connections, which is beneficial to the release of welding residual stress during welding. At the same time, each supporting block 7 and each pressing block 10 are adjusted by a telescopic adjusting screw 4, and the water film gap size can be controlled during welding. The gap size can be timely ensured to meet the requirements and uniformity by adjusting the length of the adjusting screw 4, thereby improving the performance and service life of the product. At the same time, each part of the tooling and the quenching ring (upper semi-annular tube) are connected and supported by non-rigid connections. There is no welding between 21 and the lower half annular tube 22), which is convenient for assembly and disassembly and reuse, and can improve production efficiency and material utilization, thereby saving tooling welding and disassembly time and tooling manufacturing costs; and the radial processing range of the tooling is adjustable within a certain size, which can be applied to quenching ring welding of different sizes, has a wide range of applications, and can greatly save the material and processing costs of repeated tooling manufacturing; the lower end of the quenching cylinder 24 is placed in the annular groove 18 to ensure the cylindricity of the quenching cylinder 24, and when adjusting each longitudinal screw 15, the quenching cylinder 24 can firmly support the bottom ring plate 16, and each support block 7 presses the upper half annular tube 21 to ensure that the flange 25 and the upper end annular surface of the upper half annular tube 21 remain flat; each weld is welded alternately and symmetrically to facilitate control of welding deformation;

[0035] When each support block 7 is pressed against the upper half ring tube 21 and the lower half ring tube 22, welding operation in the interference area is inconvenient, affecting the welding quality. After each pressing block 10 and each support block 7 are rotated to a certain position to expose the original interference area, the original interference area is welded alternately and symmetrically to improve the welding quality; the waist-shaped hole 17 facilitates the adjustment of the position of the longitudinal screw 15 and facilitates the connection with the support block 7;

[0036] The present invention can also use a stepped hole as the axial limiting hole, and when the adjusting screw 4 is rotated, the support block 4 can also be pushed to move axially outward.

Claims

1. A gasifier quench ring adjustable welding fixture, comprising a center disk and a plurality of radial support tubes fixedly connected to the center disk; characterized in that: The outer end of each support tube is fixedly connected with a connecting nut, and the connecting nuts are connected with their own adjusting screws. The adjusting screws are provided with adjusting nuts. The axial outer ends of the adjusting screws are provided with annular grooves and placed in the axial limit holes of their respective support blocks. The support blocks are connected with more than two pins, and one end of the pins is located in the annular grooves of the corresponding adjusting screws. The outer ends of the support blocks are fixedly connected with pressure blocks, and the outer ends of the pressure blocks are provided with notches. The outer ends of the support blocks below the pressure blocks are provided with an upper concave arc surface, a middle groove and a lower concave arc surface in sequence. The support blocks are connected to the longitudinal screws below them through threads, and each longitudinal screw passes through the same bottom ring plate.

2. The adjustable welding fixture for the gasification furnace quench ring according to claim 1, characterized in that: The upper end surface of the bottom ring plate is provided with an annular groove located outside each longitudinal screw.

3. The adjustable welding fixture for the gasification furnace quench ring according to claim 1 or 2, characterized in that: Each longitudinal screw rod passes through its own waist-shaped hole in the same bottom ring plate.

4. The adjustable welding fixture for the gasification furnace quench ring according to claim 3, characterized in that: The axial limiting hole is a blind hole or a stepped hole.

5. The adjustable welding fixture for the gasification furnace quench ring according to claim 4, characterized in that: The adjusting screws outside the adjusting nut are all fixedly connected with rotating nuts.

6. A method for using the gasification furnace quench ring adjustable welding tool as claimed in claim 1, comprising the following steps: A) Assemble the chilling annular cavity box and the chilling cylinder, and spot weld them; the characteristics are: B) Remove the longitudinal screws and the bottom ring plate, place the center plate, the support tubes, the adjusting screws, and the support blocks in the chilling cylinder, place the pressure blocks on the flange of the chilling annular cavity box, tighten the pressure blocks and the flange with several bolts and lock nuts passing through the notches of the pressure blocks and the bolt holes of the flange, adjust the extension length of the adjusting screws so that the support blocks support the inner wall of the chilling cylinder, and lock the adjusting screws with the adjusting nuts, and then weld the lower end of the chilling annular cavity box to the chilling cylinder. C) Remove the center plate, support tubes, adjusting screws, support blocks and pressure blocks, and weld the inner ring tube to the inner wall of the quenching cylinder; D) Test-install the upper half of the quenching ring tube and the lower half of the ring tube pre-welded with steel balls, spot weld them together, and then spot weld the upper half of the ring tube to the quenching ring cavity box; E) Place the retaining ring in the middle groove of each support block, place the center plate, support tubes, adjusting screws, and support blocks in the quenching cylinder, and place each pressure block on the flange of the quenching ring cavity box, through the notch of the pressure block and the flange Connect the pressing block to the flange with several bolts and lock nuts in the bolt holes. Adjust the extension length of each adjusting screw so that the upper and lower concave arc surfaces of each support block are respectively pressed against the upper and lower half annular tubes to ensure uniform gaps between each steel ball and the quenching cylinder. Lock the adjusting screw with the adjusting nut, then tighten the lock nut on the bolt, and then pass each longitudinal screw through the bottom ring plate and connect it to each support block. By adjusting each longitudinal screw, the flange and the upper end annular surface of the upper half annular tube are kept flat, and weld the weld between the upper half annular tube and the quenching annular cavity box; F) Disassembly Remove the longitudinal screws, the bottom ring plate, the several bolts and lock nuts passing through the notches of the pressure block and the bolt holes of the flange, readjust the adjusting screws so that the upper and lower concave arc surfaces of each support block are respectively pressed against the upper and lower half ring tubes to ensure a uniform gap between each steel ball and the quenching cylinder, and then weld the butt joints between the upper and lower half ring tubes; G) Install and weld the fillet welds between the retaining ring and the upper and lower half ring tubes. If the water film gap size deviation occurs in some areas during the welding process, repeatedly adjust the adjusting screws to ensure a uniform gap between the steel ball and the quenching cylinder.

7. The method for using the adjustable welding fixture for the gasification furnace quench ring according to claim 6, characterized in that: In step E), when each longitudinal screw is passed through the bottom ring plate and connected to each support block, the lower end of the quenching cylinder is placed in the annular groove on the upper end surface of the bottom ring plate.

8. The method for using the adjustable welding fixture for the gasification furnace quench ring according to claim 6 or 7, characterized in that: When welding the circumferential fillet welds between the lower end of the quenching annular cavity box and the quenching cylinder, welding the inner ring tube on the inner wall of the quenching cylinder, welding the welds between the upper half ring tube and the quenching annular cavity box, welding the butt joints between the upper half ring tube and the lower half ring tube, and welding the fillet welds between the retaining ring and the upper and lower half ring tubes, alternating and symmetrical welding is adopted.

9. The method for using the adjustable welding fixture for the gasification furnace quench ring according to claim 8, characterized in that: When welding the weld between the upper half annular tube and the quenching annular cavity box, welding the butt joint between the upper half annular tube and the lower half annular tube, and welding the fillet welds between the retaining ring and the upper and lower half annular tubes, the interference areas within each support block are not welded temporarily. Complete the welding of the non-interference areas first. Then, after the product cools to room temperature, loosen several bolts, locking nuts and support blocks, and rotate each pressure block and each support block to a certain position to expose the original interference area, and then weld all the original interference areas alternately and symmetrically.

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