A welding device for a tube body and a method of using the same

Abstract

A kind of welding device of pipe body, the welding device of pipe body includes positioning seat, core shaft and core seat;The top of the positioning seat is connected between the bottom of third cylinder body by lower flange, and second positioning stop is arranged between lower flange and positioning seat for positioning, the top of third cylinder body is connected with the bottom of second cylinder body, the top of second cylinder body is connected with the bottom of first cylinder body, and the top of first cylinder body is connected between the bottom of core seat by upper flange, and first positioning stop is arranged between upper flange and core seat for positioning, third cylinder body, second cylinder body and first cylinder body form pipe body;The inner wall upper end of third cylinder body is provided with a plurality of evenly distributed first positioning plate, the inner wall upper end of second cylinder body is provided with a plurality of evenly distributed second positioning plate, first bolt is arranged on the positioning seat, and the inner ring of first inner support ring is connected with the end of first bolt.The welded cylinder body is not easy to deform, and welding is stable.

Description

Technical Field

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

[0002] As an important power output and power generation device, gas turbines are widely used in various fields, including ship propulsion, natural gas pipeline transportation, offshore platform power plants, and peak-shaving power generation in small and medium-sized cities. Gas turbine parts are primarily divided into three categories: casing components, blade components, and disk and shaft components. Casing components play a supporting and critical load-bearing role in the gas turbine, requiring them to withstand temperatures up to 1000°C and playing a crucial role in the overall shock and vibration resistance of the entire unit. The intake connecting pipe, a key component at the intake end of the gas turbine casing, is characterized by a large diameter, thin walls, and poor rigidity. Due to these characteristics, the central cylinder of the pipe must be welded in multiple sections. Traditional argon arc welding (TIAW) results in large weld volumes, prone to deformation at the weld seam, complex anti-deformation devices, and long welding cycles, resulting in a high risk of elliptical cylinders after welding.

[0003] The Chinese patent application with application number CN202410303858.9 and application date March 18, 2024 discloses a pipe 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 set 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 solution does not solve the problem that the welded cylinder is easily deformed.

[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 an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. 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 pipe welding device and a method for using the pipe welding device that is not easily deformed.

[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 fixed core shaft and a fixed core seat;

[0007] 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;

[0008] 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;

[0009] The cam is secured to the first and second support members and is secured to the second support member by a secure coupling between the cam and the second support member.

[0010] 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 is sleeved on the fixed core shaft, and a fourth positioning stop for positioning is arranged between the fixed core seat and the spring.

[0011] The positioning seat includes a base, a column, a positioning plate and multiple first vertical plates. The outer periphery of the top 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.

[0012] The top of the positioning plate is provided with a bayonet, the bottom of the fixed core shaft is embedded in the bayonet, and the fixed core shaft is connected to the positioning plate through a first bolt.

[0013] 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.

[0014] 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 bayonet. The clamping plate is connected to the positioning plate through a first bolt. The outer side of the middle section of the shaft body is provided with a rib plate. The outer side of the middle section of the shaft body is located on the top of the rib plate. A support seat is provided. The top of the shaft body is connected to the bottom of the connecting end.

[0015] The top side of the connecting end is threadedly fitted with a nut, the outer side of the connecting end is sheathed with a spring, and a gasket is provided between the spring and the fixed core seat.

[0016] 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 pass through the upper seat body and are connected to the top thread of the connecting plate.

[0017] A method for using a pipe welding device, comprising the following steps:

[0018] Step 1: First, spot weld a plurality of first positioning plates on the inner wall of the third cylinder in the circumferential direction for assembling the first inner support ring. 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;

[0019] 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, 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;

[0020] 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 and the welding device are concentric, and complete the parts assembly;

[0021] 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. At the same time, use screws to level the parts at the lower end of the positioning seat. Place the plastic ruler perpendicular to the annular seam of the workpiece and 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. Record them in sequence. Repeat this operation to record the distance DT and X / Y / Z coordinate values ​​of the second, third, and fourth annular seams.

[0022] Step 5: First set the vacuum degree of the workroom, then evacuate the workroom to the specified vacuum degree, then input the recorded point coordinates and perform tack welding on the annular seam. The tack welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference.

[0023] Step 6. After positioning welding is completed, 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 sequence. After welding is completed, the electron beam welder is removed.

[0024] The step 1 further includes pre-processing, which is performed before spot welding the plurality of first positioning plates, specifically as follows:

[0025] 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.

[0026] After the welding in step 6 is completed, the device is kept warm for one hour.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. In a pipe welding device and a method of using the same of the present invention, one end of a first bolt is connected to the inner ring of a first inner support ring, the first inner support ring is arranged on a first positioning plate, the outer periphery of the first inner support ring contacts the connection between the third cylinder and the second cylinder, the top of the positioning seat is connected to the fixed core shaft by a fixing bolt, a third positioning stop for positioning is provided on the positioning seat, the outer periphery of the fixed core shaft is connected to the support seat by a fixing nut, a fifth positioning stop for positioning is provided on the support seat, a second bolt is provided on the support seat, one end of the second bolt is connected to the inner ring of the second inner support ring, and application The device is assembled from multiple groups of components, which are positioned using stoppers and fixed with screws or nuts. The positioning stoppers on the positioning seat, the positioning stoppers on the fixed core shaft, and the positioning stoppers on the fixed core seat ensure concentricity after assembly of the device, preventing the cylinder and flange from being misaligned due to misalignment after assembly of the multiple groups of components. The positioning stoppers on the positioning seat and the fixed core seat ensure concentricity between the intermediate cylinder and the upper and lower flanges after assembly. An inner support ring is assembled at the joint of the intermediate cylinder and tightened with bolts to prevent concave deformation of the annular weld during welding. Electron beam welding is then used for welding. Therefore, the welded cylinder of the present invention is not easily deformed and the welding is stable.

[0029] 2. In the pipe welding device and method of use disclosed herein, the girth weld is welded using electron beam welding. Electron beam welding achieves a high depth-to-width ratio, enabling deep penetration welding without the need for multiple passes and beveling at the joints, thereby improving welding efficiency. The localized heating effect of the electron beam minimizes the heat-affected zone around the weld, reducing shrinkage and deformation. Therefore, the present invention improves welding efficiency and reduces shrinkage and deformation.

[0030] 3. The present invention's pipe welding device and method of use utilize a specific device to ensure concentricity between the core holder and the welding device, ensuring weld uniformity and quality. The electron beam welder's turntable and three-jaw clamping, along with screw leveling, ensure precise positioning of parts during welding, improving welding accuracy. Positioning welding is performed symmetrically from bottom to top along the circumference, helping to reduce welding deformation and stress concentration. Consequently, the present invention achieves high welding precision and more concentrated stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention.

[0032] Figure 2 It is a schematic diagram of the combined state of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the positioning seat in the present invention.

[0034] Figure 4It is the structural schematic diagram of the positioning mandrel in the application.

[0035] Figure 5 It is the structural schematic diagram of the positioning mandrel in the application.

[0036] Figure 6 It is the top view of the application.

[0037] Figure 7 It is the schematic diagram of the tack welding in the embodiment 4 of the application.

[0038] Figure 8 It is the schematic diagram of the welding in the embodiment 4 of the application.

[0039] Figure 9 It is the welding sequence diagram of the tack welding in the embodiment 4 of the application.

[0040] Figure 10 It is the welding sequence schematic diagram in the embodiment 4 of the application.

[0041] Figure 11 It is the welding angle schematic diagram in the embodiment 4 of the application.

[0042] 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, positioning mandrel 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, positioning mandrel 5, upper positioning 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

[0043] The application is further described in detail in the following combined with the description and specific embodiments of the drawings.

[0044] Referring to Figures 1 to 11 A pipe body welding device, the pipe body welding device comprises a positioning seat 1, a positioning mandrel 2 and a positioning mandrel 5.

[0045] 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 fixed core seat 5 via an upper flange, a first positioning stop 104 for positioning is provided between the upper flange and the fixed core seat 5, and a tube body is formed between the third cylinder 103, the second cylinder 102 and the first cylinder 101;

[0046] 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;

[0047] 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 by 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 by a fixing nut 10, and 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 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;

[0048] The top thread of the fixed core shaft 2 is fitted with a nut 8, a spring 7 is provided 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 provided between the fixed core seat 5 and the spring 7.

[0049] The positioning seat 1 includes a base 13, a column 14, a positioning plate 15 and multiple first vertical plates 17. The outer periphery of the top 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.

[0050] The top of the positioning plate 15 is provided with a bayonet 16 , the bottom of the fixed core shaft 2 is embedded in the bayonet 16 , and the fixed core shaft 2 is connected to the positioning plate 15 via a first bolt 18 .

[0051] The support seat 3 includes a support plate 31 and multiple second vertical plates 32. Multiple evenly distributed second vertical plates 32 are installed on the top of the support plate 31. The side of each second vertical plate 32 is threaded 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.

[0052] 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 the 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. The top of the shaft body 21 is connected to the bottom of the connecting end 24.

[0053] The top side of the connecting end 24 is threadedly fitted with a nut 8 , the outer side of the connecting end 24 is sheathed with a spring 7 , and a gasket 6 is provided between the spring 7 and the fixed core seat 5 .

[0054] The core seat 5 includes an upper seat body 51 and a connecting plate 52. The outer bottom 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 multiple hexagonal bolts 53. All the hexagonal bolts 53 pass through the upper seat body 51 and are connected to the top thread of the connecting plate 52.

[0055] A method for using a pipe welding device, comprising the following steps:

[0056] Step 1: First, spot weld multiple first positioning plates 121 on the inner wall of the third cylinder 103 in the circumferential direction for assembling the first inner support ring 12. Then, install the lower flange, the third cylinder 103, and the first inner support ring 12 in order from bottom to top, and then tighten the first inner support ring 12 with the first bolts 18.

[0057] 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, 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;

[0058] 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;

[0059] 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, and level the parts with screws at the lower end of the positioning seat 1. Place the plastic ruler perpendicular to the annular seam of the workpiece, adjust the electron gun to move toward the workpiece, and move the electron gun to the bottom of the electron gun just touching the other end of the plastic ruler. Remove the plastic ruler and record the distance DT and the point coordinates X1, Y1, and Z1. Repeat this operation to record the distance DT and X / Y / Z coordinate values ​​of the second, third, and fourth annular seams.

[0060] Step 5: First set the vacuum degree of the workroom, then evacuate the workroom to the specified vacuum degree, then input the recorded point coordinates and perform tack welding on the annular seam. The tack welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference.

[0061] Step 6. After positioning welding is completed, 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 sequence. After welding is completed, the electron beam welder is removed.

[0062] The step 1 also includes pre-processing, which is performed before spot welding the plurality of first positioning plates 121, as follows:

[0063] 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.

[0064] After the welding in step 6 is completed, the device is kept warm for one hour.

[0065] The supplementary description of the present invention is as follows:

[0066] The tube 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 middle cylinder is concentric with the upper and lower flanges after assembly. The inner support ring is assembled at the joint of the middle cylinder and tightened by bolts to avoid concave deformation of the ring weld during the welding process.

[0067] Example 1:

[0068] A welding device for a pipe body, the welding device of the pipe body includes a positioning seat 1, a fixing core shaft 2 and a fixing core seat 5; the top of the positioning seat 1 is connected to the bottom of the third cylinder 103 by a lower flange, and 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 fixing core seat 5 by an upper flange, and a first positioning stop 104 for positioning is provided between the upper flange and the fixing core seat 5, and the third cylinder 103, the second cylinder 102 and the first cylinder 101 constitute a pipe body; 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; a first bolt 18 is provided 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 is connected, the first inner support ring 12 is set 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 by 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 by a fixing nut 10, and the support seat 3 is provided with a fifth positioning stop 108 for positioning. 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 provided between the fixed core seat 5 and the spring 7.

[0069] A method for using a pipe welding device, comprising the following steps:

[0070] Step 1: First, spot weld multiple first positioning plates 121 on the inner wall of the third cylinder 103 in the circumferential direction for assembling the first inner support ring 12. Then, install the lower flange, the third cylinder 103, and the first inner support ring 12 in order from bottom to top, and then tighten the first inner support ring 12 with the first bolts 18.

[0071] 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, 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;

[0072] 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;

[0073] 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, and level the parts with screws at the lower end of the positioning seat 1. Place the plastic ruler perpendicular to the annular seam of the workpiece, adjust the electron gun to move toward the workpiece, and move the electron gun to the bottom of the electron gun just touching the other end of the plastic ruler. Remove the plastic ruler and record the distance DT and the point coordinates X1, Y1, and Z1. Repeat this operation to record the distance DT and X / Y / Z coordinate values ​​of the second, third, and fourth annular seams.

[0074] Step 5: First set the vacuum degree of the workroom, then evacuate the workroom to the specified vacuum degree, then input the recorded point coordinates and perform tack welding on the annular seam. The tack welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference.

[0075] Step 6. After positioning welding is completed, 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 sequence. After welding is completed, the electron beam welder is removed.

[0076] Example 2:

[0077] Example 2 is basically the same as Example 1, except that:

[0078] The positioning seat 1 includes 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 column 14 is connected to the bottom of the positioning plate 15. The top of the positioning plate 15 is provided with a plurality of 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 screwed 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.

[0079] 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 decreased as needed to accommodate workpieces of different sizes and shapes.

[0080] Example 3:

[0081] Example 3 is basically the same as Example 1, except that:

[0082] 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, and the clamping plate 23 is embedded in the bayonet 16. The clamping plate 23 is connected to the positioning plate 15 by a first bolt 18. The outer side of the middle section of the shaft body 21 is surrounded by a rib plate 22, and 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 fitted 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 fitted with a plurality of hexagonal bolts 53. All the hexagonal bolts 53 pass through the upper fixed seat body 51 and are threadedly connected to the top of the connecting plate 52.

[0083] During application: the various components between the fixed core shaft and the fixed core seat are tightly combined, which reduces the space occupied. The clamping plate is embedded in the bayonet and connected to the positioning plate through the first bolt, so as to realize the rapid positioning and fixation of the fixed core shaft and improve the work efficiency. The threaded fitting nut and spring design at the connection end allows the position of the fixed core shaft to be fine-tuned to adapt to different working 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.

[0084] Example 4:

[0085] Example 4 is basically the same as Example 1, except that:

[0086] A method for using a pipe welding device, comprising the following steps:

[0087] Step 1: First, spot weld multiple first positioning plates 121 on the inner wall of the third cylinder 103 in the circumferential direction for assembling the first inner support ring 12. Then, install the lower flange, the third cylinder 103, and the first inner support ring 12 in order from bottom to top, and then tighten the first inner support ring 12 with the first bolts 18.

[0088] 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, 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;

[0089] 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;

[0090] 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;

[0091] Step 4. After the parts are assembled, hoist them onto the turntable of the electron beam welder. Clamp the parts with the three claws of the turntable. At the same time, use a screw to level the parts at the lower end of the positioning seat 1. Place the plastic ruler perpendicular to the annular seam of the workpiece and 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. At the same time, record the point coordinates X1, Y1, Z1...X4, Y4, Z4 in sequence. Repeat 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.

[0092] Step 5: First set the vacuum degree of the workroom to 7*10-4mbar, then evacuate the workroom to the specified vacuum degree, then input the recorded point coordinates and perform tack welding on the annular seam. The tack welding sequence is to weld the annular seam from bottom to top first, and then perform symmetrical welding evenly along the circumference in the order of 1-6.

[0093] 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 proceeds 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°). Figure 10 As shown in Figure 2, the welding parameters are electron beam current I, surface current 2.5A, welding speed 800mm / min, acceleration voltage 50KV, as shown in Figure 2. Figure 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.

[0094] 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 four circumferential seams. The welds are free of defects such as cracks, bite marks, and shrinkage cavities.

[0095] 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 in 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 fixed core shaft (2) and a fixed core 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 fixed core seat (5) are connected via an upper flange, a first positioning stop (104) for positioning is provided between the upper flange and the fixed core 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 provided on the first positioning plate (121), 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) through 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), and 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), and one end of the second bolt (4) is connected to the inner ring of the second inner support ring (34). The outer periphery of the second inner support ring (34) contacts the connection between the second cylinder (102) and the first cylinder (101), and the second inner support ring (34) is provided on the second positioning plate (341); The top thread of the fixed core shaft (2) is fitted with a nut (8), a spring (7) is provided 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 provided between the fixed core seat (5) and the spring (7); The positioning seat (1) includes 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 column (14) is connected to the bottom of the positioning plate (15), and a plurality of evenly distributed first vertical plates (17) are provided on the top of the positioning plate (15), and the side surface of each first vertical plate (17) is threadedly matched with a first bolt (18), and one end of the first bolt (18) passes through the first vertical plate (17) and is connected to the inner ring of the first inner support ring (12); The top of the positioning plate (15) is provided with a bayonet (16), the bottom of the fixed core shaft (2) is embedded in the bayonet (16), and the fixed core shaft (2) is connected to the positioning plate (15) via a first bolt (18); 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 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). The top of the shaft body (21) is connected to the bottom of the connecting end (24).

2. The pipe welding device according to claim 1, 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 installed on the top of the support plate (31). The side surface of each second vertical plate (32) is threadedly engaged 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).

3. The pipe welding device according to claim 1, characterized in that: The top side of the connecting end (24) is threadedly fitted with a nut (8), the outer side of the connecting end (24) is sheathed with a spring (7), and a gasket (6) is provided between the spring (7) and the fixed core seat (5).

4. 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 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) pass through the upper fixing seat body (51) and are connected to the top thread of the connecting plate (52).

5. 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 fixed core shaft (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 fixed core shaft (2) are positioned through the first positioning stop (104), ensuring that the fixed core shaft (2) is concentric with the welding device, and completing the parts assembly; Step 4. After the parts are assembled, hoist the whole onto the electron beam welding machine turntable (E), clamp the parts with the turntable three claws (F), and level the parts with the screw (G) at the lower end of the positioning seat (1). Place the plastic ruler perpendicular to the workpiece annular seam, adjust the electron gun to move toward the workpiece, and move the electron gun to the bottom of the electron gun just touching the other end of the plastic ruler. Remove the plastic ruler, record the distance DT, and the point coordinates (X1, Y1, Z1) recorded at the same time. Operate and record in sequence, and 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 this way. Step 5: First set the vacuum degree of the workroom, then evacuate the workroom to the specified vacuum degree, then input the recorded point coordinates and perform tack welding on the annular seam. The tack 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.

6. The method for using the pipe welding device according to claim 5, characterized in that: The step 1 further includes pre-processing, 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.

7. The method for using the pipe welding device according to claim 5, characterized in that: After the welding in step 6 is completed, the device is kept warm for one hour.

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