Pipe body welding device and using method thereof

Abstract

The invention discloses a welding device for a pipe body. The welding device for the pipe body comprises a positioning seat, a core fixing shaft and a core fixing seat, the top of the positioning seat is connected with the bottom of the third barrel through a lower flange, a second positioning spigot used for positioning is arranged between the lower flange and the positioning seat, the top of the third barrel is connected with the bottom of the second barrel, and the top of the second barrel is connected with the bottom of the first barrel. The top of the first barrel body is connected with the bottom of the fixed core seat through an upper flange, a first positioning spigot for positioning is arranged between the upper flange and the fixed core seat, and a pipe body is formed among the third barrel body, the second barrel body and the first barrel body; a plurality of evenly-distributed first positioning plates are arranged at the upper end of the inner wall of the third barrel, a plurality of evenly-distributed second positioning plates are arranged at the upper end of the inner wall of the second barrel, a first bolt is arranged on the positioning seat, and one end of the first bolt is connected with an inner ring of the first inner supporting ring. The welded barrel is not prone to deformation, and welding is stable.

Description

Technical Field

[0001] The invention relates to an improvement of a pipe body welding technology, belongs to the welding field, and in particular to a pipe body welding device and a use method thereof. Background Art

[0002] As an important power output and power generation equipment, gas turbines are widely used in many fields, including ship power, natural gas pipeline transportation, offshore platform power stations, and peak-shaving power generation in small and medium-sized cities. The parts of gas turbines are mainly divided into three categories: casing parts, blade parts, and disc shaft parts. Casing parts play a supporting and key force-bearing role in gas turbines. They need to withstand high temperatures up to 1000°C and play a vital role in the impact and vibration resistance of the whole machine. The air intake connecting pipe body is the main component of the air intake end of the gas turbine casing, which has the characteristics of large diameter, thin wall and poor rigidity. Due to these characteristics, the cylinder in the middle of the pipe body needs to be divided into multiple parts for welding. The traditional argon arc welding has a large welding volume, the weld position is easy to deform, the anti-deformation device is complicated, and the welding cycle is long, which makes the cylinder very easy to become elliptical after welding.

[0003] A Chinese patent application with application number CN202410303858.9 and application date March 18, 2024 discloses a pipe body welding device for butt welding a first pipe body and a second pipe body, comprising: a frame body, a first chuck for clamping the first pipe body and a second chuck for clamping the second pipe body are rotatably connected to the frame body, and the first chuck and the second chuck are arranged relatively spaced apart; a sealing cover, the sealing cover is arranged in the gap between the first chuck and the second chuck, and the two ends of the sealing cover are respectively provided with a first port and a second port, and the end to be welded of the first pipe body is sealed Inserted in the first port, the end of the second tube body to be welded is sealed and inserted in the second port; therefore, the butt joint between the first tube body and the second tube body is located in the sealing cover, and the inert gas flowing out from the butt joint is concentrated in the sealing cover; the welding gun, the frame is provided with a connecting piece that can move along the radial direction of the first chuck, the welding gun is arranged on the connecting piece, and the side wall of the sealing cover is provided with an opening, and the moving connecting piece can make the welding gun inserted into the opening or out of the opening; after the welding gun is inserted into the opening, it enters the sealing cover for welding, but the above scheme does not solve the problem that the welded cylinder is easy to deform.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of this patent application, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem in the prior art that the welded cylinder is easily deformed, and to provide a welding device for a pipe body whose welded cylinder is not easily deformed and a method for using the same.

[0006] To achieve the above objectives, the technical solution of the present invention is: a pipe welding device, the pipe welding device comprising a positioning seat, a centering shaft and a centering seat; The top of the positioning seat is connected to the bottom of the third cylinder through a lower flange, a second positioning stop for positioning is provided between the lower flange and the positioning seat, the top of the third cylinder is connected to the bottom of the second cylinder, the top of the second cylinder is connected to the bottom of the first cylinder, the top of the first cylinder is connected to the bottom of the fixed core seat through an upper flange, a first positioning stop for positioning is provided between the upper flange and the fixed core seat, and a tube body is formed between the third cylinder, the second cylinder and the first cylinder; The upper end of the inner wall of the third cylinder is provided with a plurality of evenly distributed first positioning plates, and the upper end of the inner wall of the second cylinder is provided with a plurality of evenly distributed second positioning plates; The first and second inner rings are connected to each other via a fixing nut and a second fixing nut, and the fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the support seat via a fixing nut. The fixing nut is connected to the second fixing nut. The fixing nut is connected to the second fixing nut. The fixing nut is connected to the second fixing nut. The fixing nut is connected to the second fixing nut. The top thread of the fixed core shaft is matched with a nut, a spring is arranged between the nut and the top of the fixed core seat, the spring sleeve is arranged on the fixed core shaft, and a fourth positioning stop for positioning is arranged between the fixed core seat and the spring.

[0007] The positioning seat includes a base, a column, a positioning plate and multiple first vertical plates. The top outer periphery of the base is connected to the bottom of the third cylinder. Multiple columns are installed on the top of the base. The top of the column is connected to the bottom of the positioning plate. The top of the positioning plate is provided with multiple evenly distributed first vertical plates. The side surface of each first vertical plate is threaded with a first screw. One end of the first screw passes through the first vertical plate and is connected to the inner ring of the first inner support ring.

[0008] The top of the positioning plate is provided with a bayonet, the bottom of the centering shaft is embedded in the bayonet, and the centering shaft is connected to the positioning plate through a first bolt.

[0009] The support seat includes a support plate and multiple second vertical plates. Multiple evenly distributed second vertical plates are installed on the top of the support plate. The side of each second vertical plate is threaded with a second screw. One end of the second screw passes through the first vertical plate and is connected to the inner ring of the first inner support ring.

[0010] The fixed core shaft includes a shaft body, a rib plate, a clamping plate and a connecting end. The bottom of the shaft body is connected to the top of the clamping plate. The clamping plate is embedded in the clamping slot. The clamping plate is connected to the positioning plate through a first bolt. The outer periphery of the middle section of the shaft body is provided with a rib plate. The outer periphery of the middle section of the shaft body is provided with a support seat on the top of the rib plate. The top of the shaft body is connected to the bottom of the connecting end.

[0011] The top side of the connecting end is threadedly matched with a nut, the outer side of the connecting end is sleeved with a spring, and a gasket is arranged between the spring and the fixed core seat.

[0012] The core seat includes an upper seat body and a connecting plate. The bottom outer side of the upper seat body is connected to the top of the first cylinder. The top thread of the upper seat body is matched with multiple hexagonal bolts. All the hexagonal bolts penetrate the upper seat body and are connected to the top thread of the connecting plate.

[0013] A method for using a pipe welding device, the method comprising the following steps: Step 1: First, spot weld a plurality of first positioning plates on the inner wall of the third cylinder in the circumferential direction to assemble the first inner support ring, and then install the lower flange, the third cylinder, and the first inner support ring in order from bottom to top, and then tighten the first inner support ring with the first bolt; Step 2: first assemble the fixed core shaft, then position the fixed core shaft through the third positioning stop on the positioning seat, and fix it with the fixing bolt, then assemble the support seat, position it through the fifth positioning stop, and fix it with the fixing nut, and then install the second cylinder and the second inner support ring in order from bottom to top, and tighten the second inner support ring with the second bolt; Step 3: Assemble the first cylinder and the upper flange first, then assemble the core seat, position them through the fourth positioning stop, and then install the spring and nut in sequence to fix them. The upper flange and the core seat are positioned through the first positioning stop to ensure that the core seat is concentric with the welding device, and complete the parts assembly; Step 4. After the parts are assembled, hoist them onto the turntable of the electron beam welding machine. Clamp the parts with the three claws of the turntable. Level the parts with screws at the lower end of the positioning seat. Place the plastic ruler vertically to the annular seam of the workpiece. Adjust the electron gun to move toward the workpiece until the bottom of the electron gun just touches the other end of the plastic ruler. Remove the plastic ruler and record the distance DT and the point coordinates X1, Y1, and Z1. Operate and record in sequence. Record the distance DT and X / Y / Z coordinate values ​​of the second annular seam, the third annular seam, and the fourth annular seam in sequence. Step 5: first set the vacuum degree of the workshop, then evacuate the vacuum of the workshop to the specified vacuum degree, then input the recorded point coordinates, and perform positioning welding on the annular seam. The positioning welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference; Step 6. After the positioning welding is completed, the formal welding is carried out. The turntable rotates around the C axis, and the electron gun does not move. Welding starts from the starting point and proceeds in a clockwise direction. From bottom to top, the third ring seam, the second ring seam, and the first ring seam are welded in turn. After welding is completed, the electron beam welder is removed.

[0014] The step 1 also includes pretreatment, which is performed before spot welding the plurality of first positioning plates, as follows: Use a piece of cloth or industrial oil-wiping paper dipped in anhydrous alcohol to clean all surfaces of each part and welding device to remove oil stains, and then use a white silk cloth dipped in anhydrous acetone to wipe until the silk cloth is no longer black.

[0015] After the welding in step 6 is completed, the device is kept warm for one hour.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In a pipe body welding device and a method for using the same, one end of a first bolt is connected to an inner ring of a first inner support ring, the first inner support ring is arranged on a first positioning plate, an outer periphery of the first inner support ring contacts a connection between a third cylinder and a second cylinder, a top of a positioning seat is connected to a fixed core shaft by a fixing bolt, a third positioning stop for positioning is arranged on the positioning seat, an outer periphery of the fixed core shaft is connected to a support seat by a fixing nut, a fifth positioning stop for positioning is provided on the support seat, a second bolt is arranged on the support seat, one end of the second bolt is connected to an inner ring of a second inner support ring, and application When the device is assembled by multiple groups of components, the stopper is used for positioning, and the screw or nut is used for fixing. The positioning stopper on the positioning seat, the positioning stopper on the fixed core shaft, and the positioning stopper on the fixed core seat ensure that the device is concentric after assembly, and avoid the cylinder and flange of the parts being not concentric after the multiple groups of components are assembled. The positioning stopper on the positioning seat and the positioning stopper on the fixed core seat ensure that the middle cylinder is concentric with the upper and lower flanges after assembly. The inner support ring is assembled at the joint part of the middle cylinder, and the inner support ring is tightened by bolts to avoid concave deformation of the ring weld during welding, and then electron beam welding is used for welding. Therefore, the cylinder welded by the present invention is not easy to deform, and the welding is stable.

[0017] 2. In a welding device for a pipe body and a method for using the same, the circumferential weld is welded by electron beam welding, which can achieve a high depth-to-width ratio and perform deep penetration welding without the need for multiple passes of welding. The splicing position does not need to be grooved, thereby improving welding efficiency. Due to the local heating effect of the electron beam, the heat-affected zone around the weld can be minimized, and shrinkage and deformation can be reduced. Therefore, the present invention improves welding efficiency and reduces shrinkage and deformation.

[0018] 3. In the welding device of a pipe body and the use method thereof of the present invention, a specific device is used for the concentricity of the core seat and the welding device, which can ensure the uniformity and quality of the weld. The electron beam welding machine turntable and three-claw clamping and screw leveling ensure the accurate position of the parts during the welding process, which is conducive to improving the welding accuracy. The positioning welding sequence is from bottom to top, and symmetrical welding is performed uniformly along the circumference, which helps to reduce welding deformation and stress concentration. Therefore, the welding accuracy of the present invention is high and the stress is more concentrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of the combined state of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the positioning seat in the present invention.

[0022] Figure 4 It is a structural schematic diagram of the fixed core shaft in the present invention.

[0023] Figure 5 It is a structural schematic diagram of the fixed core seat in the present invention.

[0024] Figure 6 It is a top view of the present invention.

[0025] Figure 7 It is a schematic diagram of positioning welding in Example 4 of the present invention.

[0026] Figure 8 It is a schematic diagram of welding in Example 4 of the present invention.

[0027] Fig. 9 It is a welding sequence diagram of positioning welding in Example 4 of the present invention.

[0028] Fig.10 It is a schematic diagram of the welding sequence of Example 4 in the present invention.

[0029] Fig.11 It is a schematic diagram of welding angles in Example 4 of the present invention.

[0030] In the figure: positioning seat 1, fixing bolt 11, second inner support ring 12, first positioning plate 121, base 13, column 14, positioning plate 15, bayonet 16, first vertical plate 17, first screw 18, fixed core shaft 2, shaft body 21, rib plate 22, clamping plate 23, connecting end 24, support seat 3, support plate 31, second vertical plate 32, second screw 33, second inner support ring 34, second positioning plate 341, fixed core seat 5, upper fixed seat body 51, connecting plate 52, hexagonal bolt 53, gasket 6, spring 7, nut 8, first cylinder 101, second cylinder 102, third cylinder 103, first positioning stop 104, second positioning stop 105, third positioning stop 106, fifth positioning stop 108. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] See also Figures 1 to 11 , a pipe body welding device, the pipe body welding device comprises a positioning seat 1, a centering shaft 2 and a centering seat 5; The top of the positioning seat 1 is connected to the bottom of the third cylinder 103 via a lower flange, a second positioning stop 105 for positioning is provided between the lower flange and the positioning seat 1, the top of the third cylinder 103 is connected to the bottom of the second cylinder 102, the top of the second cylinder 102 is connected to the bottom of the first cylinder 101, the top of the first cylinder 101 is connected to the bottom of the core fixing seat 5 via an upper flange, a first positioning stop 104 for positioning is provided between the upper flange and the core fixing seat 5, and a tube body is formed between the third cylinder 103, the second cylinder 102 and the first cylinder 101; The upper end of the inner wall of the third cylinder 103 is provided with a plurality of evenly distributed first positioning plates 121, and the upper end of the inner wall of the second cylinder 102 is provided with a plurality of evenly distributed second positioning plates 341; The positioning seat 1 is provided with a first bolt 18, one end of the first bolt 18 is connected to the inner ring of the first inner support ring 12, the first inner support ring 12 is arranged on the first positioning plate 1031, the outer periphery of the first inner support ring 12 contacts the connection between the third cylinder 103 and the second cylinder 102, the top of the positioning seat 1 is connected to the fixed core shaft 2 through a fixing bolt 11, a third positioning stop 106 for positioning is provided on the positioning seat 1, the outer periphery of the fixed core shaft 2 is connected to the support seat 3 through a fixing nut 10, a fifth positioning stop 108 for positioning is provided on the support seat 3, a second bolt 4 is provided on the support seat 3, one end of the second bolt 4 is connected to the inner ring of the second inner support ring 12, the outer periphery of the second inner support ring 12 contacts the connection between the second cylinder 102 and the first cylinder 101, and the second inner support ring 12 is arranged on the second positioning plate 341; The top thread of the centering shaft 2 is matched with a nut 8, a spring 7 is arranged between the nut 8 and the top of the centering seat 5, the spring 7 is sleeved on the centering shaft 2, and a fourth positioning stop 107 for positioning is arranged between the centering seat 5 and the spring 7.

[0033] The positioning seat 1 includes a base 13, columns 14, a positioning plate 15 and multiple first vertical plates 17. The top outer periphery of the base 13 is connected to the bottom of the third cylinder 103. Multiple columns 14 are installed on the top of the base 13. The top of the column 14 is connected to the bottom of the positioning plate 15. The top of the positioning plate 15 is provided with multiple evenly distributed first vertical plates 17. The side surface of each first vertical plate 17 is threaded with a first screw 18. One end of the first screw 18 passes through the first vertical plate 17 and is connected to the inner ring of the first inner support ring 12.

[0034] The top of the positioning plate 15 is provided with a bayonet 16 , the bottom of the centering shaft 2 is embedded in the bayonet 16 , and the centering shaft 2 is connected to the positioning plate 15 via a first bolt 18 .

[0035] The support seat 3 includes a support plate 31 and a plurality of second vertical plates 32. A plurality of evenly distributed second vertical plates 32 are installed on the top of the support plate 31. The side surface of each second vertical plate 32 is threadedly fitted with a second screw 33. One end of the second screw 33 passes through the first vertical plate 17 and is connected to the inner ring of the first inner support ring 12.

[0036] The centering shaft 2 includes a shaft body 21, a rib plate 22, a clamping plate 23 and a connecting end 24. The bottom of the shaft body 21 is connected to the top of the clamping plate 23. The clamping plate 23 is embedded in the bayonet 16. The clamping plate 23 is connected to the positioning plate 15 through a first bolt 18. The outer side of the middle section of the shaft body 21 is provided with a rib plate 22. The outer side of the middle section of the shaft body 21 is located on the top of the rib plate 22. A support seat 3 is provided on the top of the rib plate 22. The top of the shaft body 21 is connected to the bottom of the connecting end 24.

[0037] The top side of the connection end 24 is threadedly fitted with a nut 8 , the outer side of the connection end 24 is sheathed with a spring 7 , and a gasket 6 is provided between the spring 7 and the fixed core seat 5 .

[0038] The core seat 5 includes an upper seat body 51 and a connecting plate 52. The bottom outer side of the upper seat body 51 is connected to the top of the first cylinder 101. The top thread of the upper seat body 51 is matched with a plurality of hexagonal bolts 53. All the hexagonal bolts 53 penetrate the upper seat body 51 and are connected to the top thread of the connecting plate 52.

[0039] A method for using a pipe welding device, the method comprising the following steps: Step 1: First, spot weld a plurality of first positioning plates 121 in the circumferential direction of the inner wall of the third cylinder 103 for assembling the first inner support ring 12, and then sequentially install the lower flange, the third cylinder 103, and the first inner support ring 12 from bottom to top, and then tighten the first inner support ring 12 with the first bolt 18; Step 2: first assemble the fixed core shaft 2, then position the fixed core shaft 2 through the third positioning stop 106 on the positioning seat 1, and fix it with the fixing bolt 11, then assemble the support seat 3, position it through the fifth positioning stop 108, and fix it with the fixing nut 10, and then install the second cylinder 102 and the second inner support ring 34 in order from bottom to top, and tighten the second inner support ring 34 with the second bolt 4; Step 3: Assemble the first cylinder 101 and the upper flange first, then assemble the core holder 2, position it through the fourth positioning stop 107, and then install the spring 7 and nut 8 in sequence to fix it. The upper flange and the core holder 2 are positioned through the first positioning stop 104 to ensure that the core holder 2 is concentric with the welding device, and the parts assembly is completed; Step 4. After the parts are assembled, hoist them onto the turntable of the electron beam welding machine. Clamp and fix the parts with the three claws of the turntable. Level the parts with screws at the lower end of the positioning seat 1. Place the plastic ruler vertically to the annular seam of the workpiece. Adjust the electron gun to move toward the workpiece until the bottom of the electron gun just touches the other end of the plastic ruler. Remove the plastic ruler and record the distance DT and the point coordinates X1, Y1, and Z1. Operate and record in sequence. Record the distance DT and X / Y / Z coordinate values ​​of the second annular seam, the third annular seam, and the fourth annular seam in sequence. Step 5: first set the vacuum degree of the workshop, then evacuate the vacuum of the workshop to the specified vacuum degree, then input the recorded point coordinates, and perform positioning welding on the annular seam. The positioning welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference; Step 6. After the positioning welding is completed, the formal welding is carried out. The turntable rotates around the C axis, and the electron gun does not move. Welding starts from the starting point and proceeds in a clockwise direction. From bottom to top, the third ring seam, the second ring seam, and the first ring seam are welded in turn. After welding is completed, the electron beam welder is removed.

[0040] The step 1 also includes pre-processing, which is performed before spot welding the plurality of first positioning plates 121, as follows: Use a piece of cloth or industrial oil-wiping paper dipped in anhydrous alcohol to clean all surfaces of each part and welding device to remove oil stains, and then use a white silk cloth dipped in anhydrous acetone to wipe until the silk cloth is no longer black.

[0041] After the welding in step 6 is completed, the device is kept warm for one hour.

[0042] The supplementary description of the present invention is as follows: The pipe body here is the air intake connecting pipe at the air intake end of the gas turbine casing. The first positioning stop 105 on the positioning seat 1 and the second positioning stop 104 on the core seat 5 ensure that the intermediate cylinder is concentric with the upper and lower flanges after assembly. The inner support ring is assembled at the joint of the intermediate cylinder and tightened by bolts to avoid concave deformation of the ring weld during welding.

[0043] Embodiment 1: A welding device for a pipe body, the welding device for a pipe body comprises a positioning seat 1, a core fixing shaft 2 and a core fixing seat 5; the top of the positioning seat 1 is connected to the bottom of the third cylinder 103 by a lower flange, a second positioning stop 105 for positioning is arranged between the lower flange and the positioning seat 1, the top of the third cylinder 103 is connected to the bottom of the second cylinder 102, the top of the second cylinder 102 is connected to the bottom of the first cylinder 101, the top of the first cylinder 101 is connected to the bottom of the core fixing seat 5 by an upper flange, a first positioning stop 104 for positioning is arranged between the upper flange and the core fixing seat 5, and the third cylinder 103, the second cylinder 102 and the first cylinder 101 constitute a pipe body; a plurality of uniformly distributed first positioning plates 121 are arranged on the upper end of the inner wall of the third cylinder 103, and a plurality of uniformly distributed second positioning plates 341 are arranged on the upper end of the inner wall of the second cylinder 102; a first bolt 18 is arranged on the positioning seat 1, and one end of the first bolt 18 is connected to the first inner support ring 12 The inner ring of the first inner support ring 12 is arranged on the first positioning plate 1031, and the outer periphery of the first inner support ring 12 contacts the connection between the third cylinder 103 and the second cylinder 102. The top of the positioning seat 1 is connected to the fixed core shaft 2 through a fixing bolt 11, and a third positioning stop 106 for positioning is arranged on the positioning seat 1. The outer periphery of the fixed core shaft 2 is connected to the support seat 3 through a fixing nut 10, and a fifth positioning stop 108 for positioning is opened on the support seat 3. There is a second bolt 4, one end of the second bolt 4 is connected to the inner ring of the second inner support ring 12, the outer periphery of the second inner support ring 12 is in contact with the connection between the second cylinder 102 and the first cylinder 101, and the second inner support ring 12 is arranged on the second positioning plate 341; the top thread of the fixed core shaft 2 is matched with a nut 8, and a spring 7 is arranged between the nut 8 and the top of the fixed core seat 5, and the spring 7 is sleeved on the fixed core shaft 2, and a fourth positioning stop 107 for positioning is arranged between the fixed core seat 5 and the spring 7.

[0044] A method for using a pipe welding device, the method comprising the following steps: Step 1: First, spot weld a plurality of first positioning plates 121 in the circumferential direction of the inner wall of the third cylinder 103 for assembling the first inner support ring 12, and then sequentially install the lower flange, the third cylinder 103, and the first inner support ring 12 from bottom to top, and then tighten the first inner support ring 12 with the first bolt 18; Step 2: first assemble the fixed core shaft 2, then position the fixed core shaft 2 through the third positioning stop 106 on the positioning seat 1, and fix it with the fixing bolt 11, then assemble the support seat 3, position it through the fifth positioning stop 108, and fix it with the fixing nut 10, and then install the second cylinder 102 and the second inner support ring 34 in order from bottom to top, and tighten the second inner support ring 34 with the second bolt 4; Step 3: Assemble the first cylinder 101 and the upper flange first, then assemble the core holder 2, position it through the fourth positioning stop 107, and then install the spring 7 and nut 8 in sequence to fix it. The upper flange and the core holder 2 are positioned through the first positioning stop 104 to ensure that the core holder 2 is concentric with the welding device, and the parts assembly is completed; Step 4. After the parts are assembled, hoist them onto the turntable of the electron beam welding machine. Clamp and fix the parts with the three claws of the turntable. Level the parts with screws at the lower end of the positioning seat 1. Place the plastic ruler vertically to the annular seam of the workpiece. Adjust the electron gun to move toward the workpiece until the bottom of the electron gun just touches the other end of the plastic ruler. Remove the plastic ruler and record the distance DT and the point coordinates X1, Y1, and Z1. Operate and record in sequence. Record the distance DT and X / Y / Z coordinate values ​​of the second annular seam, the third annular seam, and the fourth annular seam in sequence. Step 5: first set the vacuum degree of the workshop, then evacuate the vacuum of the workshop to the specified vacuum degree, then input the recorded point coordinates, and perform positioning welding on the annular seam. The positioning welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference; Step 6. After the positioning welding is completed, the formal welding is carried out. The turntable rotates around the C axis, and the electron gun does not move. Welding starts from the starting point and proceeds in a clockwise direction. From bottom to top, the third ring seam, the second ring seam, and the first ring seam are welded in turn. After welding is completed, the electron beam welder is removed.

[0045] Embodiment 2: Embodiment 2 is substantially the same as Embodiment 1, except that: The positioning seat 1 includes a base 13, a column 14, a positioning plate 15 and a plurality of first vertical plates 17. The top outer periphery of the base 13 is connected to the bottom of the third cylinder 103. A plurality of columns 14 are installed on the top of the base 13. The top of the column 14 is connected to the bottom of the positioning plate 15. A plurality of evenly distributed first vertical plates 17 are arranged on the top of the positioning plate 15. The side surface of each first vertical plate 17 is threaded with a first screw 18. One end of the first screw 18 penetrates the first vertical plate 17 and is connected to the first inner support The inner ring of the ring 12 is connected; a bayonet 16 is provided on the top of the positioning plate 15, and the bottom of the centering shaft 2 is embedded in the bayonet 16, and the centering shaft 2 is connected to the positioning plate 15 through a first bolt 18; the support seat 3 includes a support plate 31 and a plurality of second vertical plates 32, and a plurality of evenly distributed second vertical plates 32 are installed on the top of the support plate 31, and the side surface of each second vertical plate 32 is threaded with a second screw 33, and one end of the second screw 33 passes through the first vertical plate 17 and is connected to the inner ring of the first inner support ring 12.

[0046] When applied: The modular design allows each component to be replaced or adjusted as needed, which improves flexibility and ease of maintenance. The evenly distributed first vertical plates on the positioning plate and the threaded first screws provide precise positioning capabilities to ensure accurate placement of the workpiece. The centering shaft is embedded in the bayonet of the positioning plate and connected to the positioning plate through the first bolt. This integrated design simplifies the structure and reduces the complexity of assembly and maintenance. The design of the support seat allows multiple second vertical plates to be evenly distributed, providing additional support points. Support points can be increased or reduced as needed to accommodate workpieces of different sizes and shapes.

[0047] Embodiment 3: Embodiment 3 is substantially the same as Embodiment 1, except that: The fixed core shaft 2 includes a shaft body 21, a rib plate 22, a clamping plate 23 and a connecting end 24. The bottom of the shaft body 21 is connected to the top of the clamping plate 23. The clamping plate 23 is embedded in the bayonet 16. The clamping plate 23 is connected to the positioning plate 15 through a first bolt 18. The outer side of the middle section of the shaft body 21 is provided with a rib plate 22. The outer side of the middle section of the shaft body 21 is located on the top of the rib plate 22 and a support seat 3 is provided. The top of the shaft body 21 is connected to the bottom of the connecting end 24; the top side of the connecting end 24 is threadedly matched with a nut 8, and the outer side of the connecting end 24 is sleeved with a spring 7, and a gasket 6 is provided between the spring 7 and the fixed core seat 5; the fixed core seat 5 includes an upper fixed seat body 51 and a connecting plate 52. The bottom outer side of the upper fixed seat body 51 is connected to the top of the first cylinder 101, and the top of the upper fixed seat body 51 is threadedly matched with a plurality of hexagonal bolts 53. All the hexagonal bolts 53 penetrate the upper fixed seat body 51 and are threadedly connected to the top of the connecting plate 52.

[0048] When in application: the various components between the fixed core shaft and the fixed core seat are tightly combined, which reduces the space occupation; the fixed core shaft is quickly positioned and fixed through the clamping plate embedded in the bayonet and connected to the positioning plate through the first bolt, thereby improving the work efficiency; the threaded matching nut and spring design at the connecting end allow the position of the fixed core shaft to be fine-tuned to meet different work requirements; and the use of the gasket can provide protection between the spring and the fixed core seat, prevent direct contact between metals, and reduce wear.

[0049] Embodiment 4: Embodiment 4 is substantially the same as Embodiment 1, except that: A method for using a pipe welding device, the method comprising the following steps: Step 1: First, spot weld a plurality of first positioning plates 121 in the circumferential direction of the inner wall of the third cylinder 103 for assembling the first inner support ring 12, and then sequentially install the lower flange, the third cylinder 103, and the first inner support ring 12 from bottom to top, and then tighten the first inner support ring 12 with the first bolt 18; Step 2: first assemble the fixed core shaft 2, then position the fixed core shaft 2 through the third positioning stop 106 on the positioning seat 1, and fix it with the fixing bolt 11, then assemble the support seat 3, position it through the fifth positioning stop 108, and fix it with the fixing nut 10, and then install the second cylinder 102 and the second inner support ring 34 in order from bottom to top, and tighten the second inner support ring 34 with the second bolt 4; Step 3: Assemble the first cylinder 101 and the upper flange first, then assemble the core holder 2, position it through the fourth positioning stop 107, and then install the spring 7 and nut 8 in sequence to fix it. The upper flange and the core holder 2 are positioned through the first positioning stop 104 to ensure that the core holder 2 is concentric with the welding device, and the parts assembly is completed; First, check the surface cleanliness of the weld and clean it again until no black spots can be seen when wiped with a white silk cloth, then measure the weld working distance; Step 4. After the parts are assembled, hoist them onto the turntable of the electron beam welding machine. Clamp and fix the parts with the three claws of the turntable. Level the parts with screws at the lower end of the positioning seat 1. Place the plastic ruler vertically to the annular seam of the workpiece. Adjust the electron gun to move toward the workpiece until the bottom of the electron gun just touches the other end of the plastic ruler. Remove the plastic ruler, record the distance DT, and record the point coordinates X1, Y1, Z1...X4, Y4, Z4 in sequence. Follow this operation to record the distance DT and X / Y / Z coordinate values ​​of the second annular seam B, the third annular seam C, and the fourth annular seam D in sequence. Step 5: first set the vacuum degree of the workshop to 7*10-4mbar, then evacuate the vacuum of the workshop to the specified vacuum degree, then input the recorded point coordinates, and perform positioning welding on the annular seam. The positioning welding sequence is to weld the annular seam from bottom to top first, and evenly perform symmetrical welding in the order of 1-6 along the circumference; Step 6. After the positioning welding is completed, the formal welding is carried out. The turntable rotates around the C axis, the electron gun does not move, and welding starts from the starting point and is carried out in a clockwise direction. The arc length of the arc starting segment (OA segment) corresponds to an angle of 20° (corresponding to 0°-20°), and the arc length of the arc closing segment (AB segment) corresponds to an angle of 20° (corresponding to 380°-400°). Fig.10 As shown, the welding parameters are electron beam current I, surface current 2.5A, welding speed 800mm / min, acceleration voltage 50KV, as shown in Fig.11 As shown, the third annular seam C, the second annular seam B, and the first annular seam A are welded in sequence from bottom to top, and the electron beam welder is removed after welding is completed.

[0050] After welding, keep warm for 1 hour, open the vacuum chamber, lift the workpiece out of the workshop, remove the electron beam welding tooling, and then conduct a 100% visual inspection of the 4 circumferential seams. There are no defects such as cracks, bites, shrinkage holes, etc. on the weld appearance.

[0051] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A pipe welding device, characterized in that: The pipe body welding device comprises a positioning seat (1), a centering shaft (2) and a centering seat (5); The top of the positioning seat (1) and the bottom of the third cylinder (103) are connected via a lower flange, a second positioning stop (105) for positioning is provided between the lower flange and the positioning seat (1), the top of the third cylinder (103) is connected to the bottom of the second cylinder (102), the top of the second cylinder (102) is connected to the bottom of the first cylinder (101), the top of the first cylinder (101) and the bottom of the core fixing seat (5) are connected via an upper flange, a first positioning stop (104) for positioning is provided between the upper flange and the core fixing seat (5), and a tube body is formed between the third cylinder (103), the second cylinder (102) and the first cylinder (101); The upper end of the inner wall of the third cylinder (103) is provided with a plurality of evenly distributed first positioning plates (121), and the upper end of the inner wall of the second cylinder (102) is provided with a plurality of evenly distributed second positioning plates (341); The positioning seat (1) is provided with a first bolt (18), one end of the first bolt (18) is connected to the inner ring of the first inner support ring (12), the first inner support ring (12) is arranged on the first positioning plate (1031), the outer periphery of the first inner support ring (12) is in contact with the connection between the third cylinder (103) and the second cylinder (102), the top of the positioning seat (1) is connected to the fixed core shaft (2) via a fixing bolt (11), and the positioning seat (1) is provided with a third positioning stop (106) for positioning. ), the outer periphery of the fixed core shaft (2) is connected to the support seat (3) through a fixing nut (10), the support seat (3) is provided with a fifth positioning stop (108) for positioning, a second bolt (4) is provided on the support seat (3), one end of the second bolt (4) is connected to the inner ring of the second inner support ring (12), the outer periphery of the second inner support ring (12) is in contact with the connection between the second cylinder (102) and the first cylinder (101), and the second inner support ring (12) is provided on the second positioning plate (341); The top thread of the fixed core shaft (2) is matched with a nut (8), a spring (7) is arranged between the nut (8) and the top of the fixed core seat (5), the spring (7) is sleeved on the fixed core shaft (2), and a fourth positioning stop (107) for positioning is arranged between the fixed core seat (5) and the spring (7).

2. A pipe welding device according to claim 1, characterized in that: The positioning seat (1) comprises a base (13), a column (14), a positioning plate (15) and a plurality of first vertical plates (17); the outer periphery of the top of the base (13) is connected to the bottom of the third cylinder (103); a plurality of columns (14) are installed on the top of the base (13); the top of the columns (14) is connected to the bottom of the positioning plate (15); a plurality of evenly distributed first vertical plates (17) are arranged on the top of the positioning plate (15); a first screw (18) is threadedly fitted on the side surface of each first vertical plate (17); one end of the first screw (18) passes through the first vertical plate (17) and is connected to the inner ring of the first inner support ring (12).

3. A pipe welding device according to claim 2, characterized in that: The top of the positioning plate (15) is provided with a bayonet (16), the bottom of the centering shaft (2) is embedded in the bayonet (16), and the centering shaft (2) is connected to the positioning plate (15) via a first bolt (18).

4. A pipe welding device according to claim 3, characterized in that: The support seat (3) comprises a support plate (31) and a plurality of second vertical plates (32); a plurality of evenly distributed second vertical plates (32) are mounted on the top of the support plate (31); a second screw (33) is threadedly engaged on the side surface of each second vertical plate (32); one end of the second screw (33) passes through the first vertical plate (17) and is connected to the inner ring of the first inner support ring (12).

5. The pipe welding device according to claim 3, characterized in that: The centering shaft (2) comprises a shaft body (21), a rib plate (22), a clamping plate (23) and a connecting end (24); the bottom of the shaft body (21) is connected to the top of the clamping plate (23); the clamping plate (23) is embedded in the clamping slot (16); the clamping plate (23) is connected to the positioning plate (15) via a first bolt (18); the outer periphery of the middle section of the shaft body (21) is provided with a rib plate (22); the outer periphery of the middle section of the shaft body (21) is provided with a support seat (3) on the top of the rib plate (22); and the top of the shaft body (21) is connected to the bottom of the connecting end (24).

6. A pipe welding device according to claim 5, characterized in that: The top side of the connection end (24) is threadedly fitted with a nut (8), the outer side of the connection end (24) is sleeved with a spring (7), and a gasket (6) is provided between the spring (7) and the fixed core seat (5).

7. The pipe welding device according to claim 1, characterized in that: The core fixing seat (5) comprises an upper fixing seat body (51) and a connecting plate (52); the outer bottom side of the upper fixing seat body (51) is connected to the top of the first cylinder (101); the top thread of the upper fixing seat body (51) is matched with a plurality of hexagonal bolts (53); all the hexagonal bolts (53) penetrate the upper fixing seat body (51) and are connected to the top thread of the connecting plate (52).

8. A method for using the pipe welding device according to claim 1, characterized in that: The method for using the pipe welding device comprises the following steps: Step 1: first, spot-weld a plurality of first positioning plates (121) in the circumferential direction of the inner wall of the third cylinder (103) for assembling the first inner support ring (12); then, sequentially install the lower flange, the third cylinder (103), and the first inner support ring (12) from bottom to top; and then tighten the first inner support ring (12) with the first bolt (18); Step 2: first assemble the fixed core shaft (2), then position the fixed core shaft (2) through the third positioning stop (106) on the positioning seat (1), and fix it with the fixing bolt (11), then assemble the support seat (3), position it through the fifth positioning stop (108), and fix it with the fixing nut (10), and then install the second cylinder (102) and the second inner support ring (34) in order from bottom to top, and tighten the second inner support ring (34) with the second bolt (4); Step 3: first assemble the first cylinder (101) and the upper flange, then assemble the core holder (2), position them through the fourth positioning stop (107), then sequentially install the spring (7) and the nut (8) to fix them, position the upper flange and the core holder (2) through the first positioning stop (104), ensure that the core holder (2) is concentric with the welding device, and complete the parts assembly; Step 4. After the parts are assembled, hoist them onto the electron beam welding machine turntable (E), clamp the parts with the turntable three claws (F), and level the parts with the threaded nails (G) at the lower end of the positioning seat (1). Place the plastic ruler vertically to the workpiece annular seam, adjust the electron gun to move toward the workpiece until the bottom of the electron gun just touches the other end of the plastic ruler, remove the plastic ruler, record the distance DT, and the point coordinates (X1, Y1, Z1), and record them in sequence. Follow this operation to record the distance DT and X / Y / Z coordinate values ​​of the second annular seam (B), the third annular seam (C), and the fourth annular seam (D); Step 5: first set the vacuum degree of the workshop, then evacuate the vacuum of the workshop to the specified vacuum degree, then input the recorded point coordinates, and perform positioning welding on the annular seam. The positioning welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference; Step 6. After the positioning welding is completed, the formal welding is carried out. The electron beam welder turntable (E) rotates around the C axis, and the electron gun does not move. Welding starts from the starting point and proceeds in a clockwise direction. From bottom to top, the third ring seam (C), the second ring seam (B), and the first ring seam (A) are welded in sequence. After welding is completed, the electron beam welder is removed.

9. The method for using the pipe welding device according to claim 8, characterized in that: The step one further comprises pretreatment, which is performed before spot welding the plurality of first positioning plates (121), specifically as follows: Use a piece of cloth or industrial oil-wiping paper dipped in anhydrous alcohol to clean all surfaces of each part and welding device to remove oil stains, and then use a white silk cloth dipped in anhydrous acetone to wipe until the silk cloth is no longer black.

10. The method for using the pipe welding device according to claim 8, characterized in that: After the welding in step 6 is completed, the device is kept warm for one hour.

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