Automatic butt welding device for high-pressure boiler pipe

Abstract

The present application relates to the technical field of boiler pipe welding, and discloses an automatic butt welding device for high-pressure boiler pipes, which is used for welding boiler pipes and comprises two groups of device racks arranged oppositely, and a clamping and positioning mechanism; a welding execution mechanism comprises a welding walking track and an adjusting arc-shaped track, and a welding execution head capable of walking is installed on the adjusting arc-shaped track; an air charging protection mechanism comprises two groups of gas supply units, the gas supply units are in communication with the interiors of two boiler pipes, and are used for charging protective gas from the two ends of the boiler pipes to form a protective air layer in a welding area. The double-station multi-point clamping structure can improve the butt precision of the pipes, and constrain the pipe body deformation caused by welding heat input; the double-end air charging protection mode can cover the inside area of the weld, and reduce the oxidation risk of the weld; the track type circumferential welding ensures that the weld is uniformly and stably formed; the overall integrated positioning, welding and air protection functions improve the automation degree and quality consistency of high-pressure boiler pipe welding.

Description

Technical Field

[0001] This invention relates to the field of boiler tube welding technology, and more specifically to an automated butt welding device for high-pressure boiler tubes. Background Technology

[0002] High-pressure boiler tubes are core pressure-bearing components of the heating surface system in power plant boilers, widely used in energy equipment fields such as thermal power and nuclear power. The quality of their welded joints directly determines the safety and long-term service life of the boiler equipment under high temperature and high pressure. In the factory prefabrication and on-site installation of high-pressure boiler tubes, end-to-end welding is a crucial process. The alignment accuracy of the pipe ends and the stability of the welding process directly affect the weld formation quality and pressure-bearing performance. End-to-end welding equipment, as a key auxiliary device for achieving precise pipe positioning and automated welding operations, is an important tooling for ensuring the welding quality of high-pressure boiler tubes and improving construction efficiency. Its technological advancement has significant practical implications for the power equipment manufacturing and installation field.

[0003] Existing technology discloses a matching clamp for boiler pipes (application number 202210928990.X), comprising a support assembly, a matching assembly, a clamping assembly, and a rotating assembly. Two symmetrically distributed matching assemblies are arranged above the support assembly. A clamping assembly is located at the upper end of each matching assembly, and a rotating assembly is located on the outer side of each matching assembly. By setting up the support assembly, with the matching assemblies and clamping assemblies above them, the two clamping assemblies can respectively clamp and fix two boiler pipes, while the two matching assemblies can respectively adjust the height of the two boiler pipes, thereby achieving concentric alignment of the two boiler pipes. This facilitates the welding process, improving welding efficiency while ensuring welding quality.

[0004] However, existing technologies, especially this particular solution, still have the following problems: The clamping constraint is weak, and the ability to suppress thermal deformation is insufficient: the clamping assembly only forms a single-segment clamp for the pipe, and does not build multi-point radial constraints on both sides of the weld joint. For multi-layer and multi-pass welding of high-pressure thick-walled boiler tubes, continuous heat input can easily cause elliptical deformation and axial movement of the pipe ends. The alignment accuracy gradually decreases with the welding process, and it is impossible to stably control the amount of weld misalignment, making it unsuitable for welding high-grade pipe materials.

[0005] Without a built-in back gas protection structure, the quality of the weld root is difficult to guarantee: The device does not have an argon back purging protection structure for the weld. When welding high-pressure alloy heat-resistant steel pipes, additional temporary argon purging fixtures need to be set up. The operation is cumbersome and the uniformity of the protective gas coverage is poor. Defects such as oxidation and intergranular corrosion are prone to occur at the weld root, making it difficult to meet the stringent welding quality standards of high-pressure boiler tubes. Summary of the Invention

[0006] The purpose of this invention is to provide a technical solution to address the problems in the prior art mentioned in the background section.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An automated butt welding device for high-pressure boiler tubes, used for welding boiler pipes, includes: The two sets of device frames, clamping and positioning mechanisms and welding execution mechanisms are arranged opposite to each other, and also include a double-end air-inflating protection mechanism; The clamping and positioning mechanism is used to clamp the side of the boiler pipe in a dual-position, multi-point manner. It includes two sets of boiler arc surface supports, a guide rail one and a guide rail two. The two sets of boiler arc surface supports are respectively set on the two sides of the device frame. A docking plug seat is installed on one set of boiler arc surface supports. The two sets of guide rail one and the guide rail two are installed between the device frame and the docking plug seat. Multiple sets of adjustable locking elements are provided between the guide rail one and the guide rail two. The locking elements clamp the boiler pipe from both sides. The welding actuator includes a welding travel track and an adjustable arc track, on which a welding actuator head capable of driving movement is mounted; The gas-filling protection mechanism includes two sets of gas supply units, which are internally connected to the two boiler pipes and are used to introduce protective gas from both ends of the boiler pipes to form a protective gas layer in the welding area.

[0008] Preferably, the boiler pipe is provided with at least two sets of pipe joints, the connection between the pipe joint and the boiler pipe is a welded part, and the welding actuator is used to weld the welded part along a circular path.

[0009] Preferably, the welding execution head is also equipped with a jet nozzle. While welding, the welding execution head also provides protective gas to the outside of the welded part. The gas filling protection mechanism is used to supply protective gas from inside the boiler pipe. The gas filling protection mechanism works in conjunction with the jet nozzle to simultaneously cover the inside and outside of the welded part with protective gas.

[0010] Preferably, the gas-filling protection mechanism further includes an extension pipe and a follower nozzle. The extension pipe extends axially inside the boiler pipe, and multiple sets of follower nozzles are provided and axially distributed on the extension pipe. The multiple sets of follower nozzles can move and adjust axially on the extension pipe, and the follower nozzles can rotate to ensure that the follower nozzles are correspondingly set with the welding actuator.

[0011] Preferably, a telescopic rod is mounted on the guide slide rail through a guide slide block, and a locking element is adjustablely mounted on the telescopic end of the telescopic rod. The guide slide block and the telescopic rod together achieve position adjustment of the locking element.

[0012] Preferably, the adjustable arc-shaped track is slidably mounted on the welding travel track to enable the adjustable arc-shaped track to travel axially along the boiler pipe. A guide slide is installed on the adjustable arc-shaped track, and a telescopic rod is installed on the guide slide via an angle adjustment seat. The welding actuator is mounted on the telescopic end of the telescopic rod. The angle adjustment seat is used to adjust the pitch angle and working deflection angle of the welding actuator. The telescopic rod is used to adjust the radial feed of the welding actuator.

[0013] Preferably, the adjustable arc track includes a track locking pivot and two sets of adjustable arc tracks that can be opened and closed. The adjustable arc tracks are slidably installed on the welding travel track above the track locking pivot, and the adjustable arc tracks are configured as an openable and closable structure.

[0014] Preferably, the clamping and positioning mechanism further includes a docking hole and a docking joint. The axial sides of the boiler pipe are respectively constrained by the docking hole and the docking joint. Multiple sets of locking elements form a multi-point clamping and fixing structure along the axial direction of the pipe body to suppress the pipe end deformation caused by welding heat input. One set of boiler arc support is equipped with two sets of docking holes, and another set of boiler arc support is equipped with docking sockets. The docking sockets are equipped with two sets of docking joints. The docking holes and docking joints are used for the insertion and positioning of the two ends of the boiler pipes.

[0015] Preferably, the welding execution head performs multi-layer welding on the welding part, and the locking force of the locking member is linked and adapted to the number of welding layers; as the number of welding layers increases and the heat input of the pipe body accumulates, the locking force of the locking member increases synchronously and gradually, compensating for the gap between the guide slide and the guide slide caused by thermal expansion, and ensuring the axial position accuracy of the welding travel track.

[0016] Preferably, the two gas supply units are equipped with a differential pressure linkage adjustment module to detect the gas pressure difference in the inner cavity at both ends of the boiler pipe in real time; when the gas pressure difference exceeds the set threshold, the gas supply flow on the high-pressure side is automatically adjusted to maintain the gas pressure balance in the pipe and avoid the gas pressure difference from disturbing the forming of the back side of the molten pool.

[0017] Technical effects and advantages of the present invention: The automated butt welding device for high-pressure boiler tubes proposed in this invention has the following advantages compared with the prior art: This invention uses two sets of device frames as the supporting base. During the clamping stage, the boiler pipes are supported by the boiler arc surface bracket, and the docking plug provides the end docking reference. After the positions of multiple sets of locking parts are adjusted along the first and second guide rails, the pipe body is clamped from the side, which can simultaneously complete the dual-position positioning of two pipes. During welding, the welding execution head moves circumferentially along the welding travel track and the adjusting arc track to complete the circumferential weld. Two sets of gas supply units introduce protective gas from both ends of the pipe to form a gas protective layer in the welding area.

[0018] The dual-station, multi-point clamping structure can improve the accuracy of pipe alignment and constrain pipe deformation caused by welding heat input; the double-end gas-filled protection method can cover the inner area of ​​the weld and reduce the risk of weld oxidation; the track-type circumferential welding ensures uniform and stable weld formation; the overall integration of positioning, welding, and gas protection functions improves the automation level and quality consistency of high-pressure boiler tube welding. Attached Figure Description

[0019] Figure 1 This is one of the structural schematic diagrams of an automated butt welding device for high-pressure boiler tubes according to the present invention; Figure 2 This is a second schematic diagram of the structure of an automated butt welding device for high-pressure boiler tubes according to the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a side view of the structure of the adjustable arc track and other structures in an embodiment of the present invention; Figure 6 This is a schematic diagram of the boiler pipes and pipe joints in an embodiment of the present invention; Figure 7 This is a schematic diagram of the welding method of the welding device in an embodiment of the present invention.

[0020] In the picture: 11. Device frame; 12. Boiler arc support; 13. Connecting socket; 14. Gas supply unit; 15. Guide rail one; 16. Guide rail two; 17. Guide slide one; 18. Telescopic rod one; 19. Locking element; 110. Welding travel track; 111. Adjustable arc track; 112. Welding actuator; 113. Guide slide two; 114. Angle adjustment seat; 115. Telescopic rod two; 116. Track locking shaft; 117. Connecting hole; 118. Connecting joint; 119. Following nozzle; 21. Boiler pipes; 22. Pipe joints; 23. Welding parts. Detailed Implementation

[0021] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0022] To address the pain points of insufficient welding precision and difficulty in controlling thermal deformation in high-pressure boiler tubes, this device uses two sets of oppositely arranged machine frames 11 as a load-bearing foundation, integrating a clamping and positioning mechanism, a welding execution mechanism, and a double-end gas-filling protection mechanism. The invention provides... Figures 1 to 7 As shown, an automated butt welding device for high-pressure boiler tubes is used to weld boiler pipes 21. It includes two sets of device frames 11 arranged opposite to each other, a clamping and positioning mechanism and a welding execution mechanism, and also includes a double-end gas-filling protection mechanism. The clamping and positioning mechanism is used to clamp the side of the boiler pipe 21 in a dual-position, multi-point manner. It includes two sets of boiler arc surface supports 12, a guide rail 15, and a guide rail 2 16. The two sets of boiler arc surface supports 12 are respectively set on the two side device frames 11. A docking plug seat 13 is installed on one set of boiler arc surface supports 12. The two sets of guide rail 15 and the guide rail 2 16 are installed between the device frame 11 and the docking plug seat 13. Multiple sets of adjustable locking elements 19 are provided between the guide rail 15 and the guide rail 2 16. The locking elements 19 clamp the boiler pipe 21 from both sides. The welding actuator includes a welding travel track 110 and an adjustable arc track 111, on which a welding actuator head 112 capable of driving movement is mounted; The gas-filled protection mechanism includes two sets of gas supply units 14, which are internally connected to the two boiler pipes 21 and are used to introduce protective gas from both ends of the boiler pipes 21 to form a protective gas layer in the welding area.

[0023] Working principle: With two sets of device frames 11 as the supporting base, the boiler pipe 21 is supported by the boiler arc support 12 during the clamping stage, and the docking plug seat 13 provides the end docking reference. After the multiple sets of locking parts 19 are adjusted along the guide slide rail 15 and the guide slide rail 2 16, they form a multi-point clamping of the pipe body from the side, which can simultaneously complete the dual-position positioning of two pipes. During welding, the welding execution head 112 moves circumferentially along the welding travel track 110 and the adjusting arc track 111 to complete the circumferential weld. The two sets of gas supply units 14 introduce protective gas from both ends of the pipe to form a gas protective layer in the welding area.

[0024] The dual-station, multi-point clamping structure can improve the accuracy of pipe alignment and constrain pipe deformation caused by welding heat input; the double-end gas-filled protection method can cover the inner area of ​​the weld and reduce the risk of weld oxidation; the track-type circumferential welding ensures uniform and stable weld formation; the overall integration of positioning, welding, and gas protection functions improves the automation level and quality consistency of high-pressure boiler tube welding.

[0025] Regarding the fit of the workpieces to be welded, each boiler pipe 21 corresponds to one pipe joint 22, and the mating end faces of the two together constitute the welded part 23. The boiler pipe 21 is provided with at least two sets of pipe joints 22, and the connection between the pipe joint 22 and the boiler pipe 21 is the welded part 23. The welding execution head 112 is used to weld the welded part 23 along a circular path.

[0026] It should be noted that the welding actuator 112 has an external jet structure that can cooperate with the internal gas filling protection mechanism to achieve synchronous gas protection on both the inside and outside of the welded part 23. The welding actuator 112 is also equipped with a jet head. While welding, the welding actuator 112 simultaneously provides protective gas to the outside of the welded part 23. The gas filling protection mechanism is used to supply protective gas from inside the boiler pipe 21. The gas filling protection mechanism, in conjunction with the jet head, simultaneously achieves synchronous protective gas coverage on both the inside and outside of the welded part 23.

[0027] To enhance the precise coverage of the protective gas inside the pipe, the gas filling protection mechanism is equipped with an extension pipe and a follower nozzle 119, which can adjust the gas supply direction synchronously with the welding position. The gas filling protection mechanism also includes an extension pipe and follower nozzles 119. The extension pipe extends axially inside the boiler pipe 21, and multiple sets of follower nozzles 119 are arranged axially on the extension pipe. The multiple sets of follower nozzles 119 can move and adjust axially on the extension pipe, and the follower nozzles 119 can rotate to ensure that the follower nozzles 119 are correspondingly set with the welding execution head 112.

[0028] To accommodate the need for flexible adjustment of the clamping point, the locking element 19 is mounted on the guide rail 15 via the guide slide block 17 and the telescopic rod 18, supporting axial and radial position adjustments. The telescopic rod 18 is mounted on the guide rail 15 via the guide slide block 17, and the locking element 19 is adjustablely mounted on the telescopic end of the telescopic rod 18. The guide slide block 17 and the telescopic rod 18 together achieve position adjustment of the locking element 19.

[0029] In terms of precision design at the welding execution end, the adjustable arc track 111, combined with guide slide 113, angle adjustment seat 114, and telescopic rod 115, enables multi-dimensional fine-tuning and adaptation of the welding execution head 112. The adjustable arc track 111 is slidably mounted on the welding travel track 110, enabling the adjustable arc track 111 to travel axially along the boiler pipe 21. Guide slide 113 is mounted on the adjustable arc track 111, and telescopic rod 115 is adjustablely mounted on the guide slide 113 via angle adjustment seat 114. The welding execution head 112 is mounted on the telescopic end of telescopic rod 115. The angle adjustment seat 114 is used to adjust the pitch angle and working deflection angle of the welding execution head 112. The telescopic rod 115 is used to adjust the radial feed of the welding execution head 112.

[0030] Considering the scenario of rapid assembly and disassembly of the pipe body on site, the adjustable arc-shaped rail 111 adopts an openable and closable structure, and the opening, closing and locking actions are completed by the rail locking pivot 116. The adjustable arc-shaped rail 111 includes the rail locking pivot 116 and two sets of adjustable arc-shaped rails 111 that can be opened and closed. The adjustable arc-shaped rail 111 is slidably installed on the welding travel rail 110 above the rail locking pivot 116, and the adjustable arc-shaped rail 111 is set as an openable and closable structure.

[0031] In addition, the clamping and positioning mechanism forms an end reference constraint with the docking hole 117 and the docking joint 118, and together with multiple sets of locking elements 19, it constructs a multi-point anti-deformation clamping system. The clamping and positioning mechanism also includes the docking hole 117 and the docking joint 118. The axial sides of the boiler pipe 21 form radial constraints with the docking hole 117 and the docking joint 118, respectively. Multiple sets of locking elements 19 form a multi-point clamping and fixing structure along the pipe body axial direction to suppress pipe end deformation caused by welding heat input. One set of boiler arc support 12 is provided with two sets of docking holes 117, and another set of boiler arc support 12 is provided with docking socket 13. The docking socket 13 is provided with two sets of docking joints 118. The docking holes 117 and docking joints 118 are used for the insertion and positioning of the two ends of the boiler pipe 21, respectively.

[0032] To address the issue of thermal expansion displacement during multi-layer, multi-pass welding, the locking force of the locking component 19 can be dynamically adjusted to match the number of welding layers, thus compensating for the misalignment caused by thermal expansion. The welding execution head 112 performs multi-layer welding on the welding section 23, and the locking force of the locking component 19 is dynamically adjusted to match the number of welding layers. As the number of welding layers increases and the heat input to the pipe body accumulates, the locking force of the locking component 19 increases synchronously and gradually, compensating for the misalignment caused by thermal expansion in the guide slide 17 and ensuring the axial positional accuracy of the welding travel track 110.

[0033] To maintain a stable and balanced protective gas field within the pipe, both gas supply units 14 are equipped with differential pressure linkage adjustment modules to automatically correct the gas pressure difference at both ends and avoid interfering with the formation of the back side of the molten pool. The two gas supply units 14 are equipped with differential pressure linkage adjustment modules that monitor the gas pressure difference within the boiler pipe 21 in real time. When the gas pressure difference exceeds a set threshold, the gas supply flow rate on the high-pressure side is automatically adjusted to maintain gas pressure balance within the pipe and prevent the gas pressure difference from disturbing the formation of the back side of the molten pool.

[0034] In summary, the present invention also has the following combined principles and effects: During the clamping stage of this device, the boiler pipe 21 is supported by the boiler arc-shaped supports 12 on both sides. The end is inserted and positioned by the butt joint 118 through the butt holes 117. After the positions of multiple locking parts 19 are adjusted along the guide rail 15 and guide rail 2 16, they form a multi-point clamping on the pipe body from the side to suppress welding thermal deformation. When adjusting the welding position, the welding travel track 110 and the adjusting arc track 111 drive the welding execution head 112 to complete the axial and circumferential alignment. The angle adjustment seat 114 and the telescopic rod 2 115 are used to calibrate the welding torch angle and feed rate. The openable track structure can be quickly assembled and disassembled through the track locking pivot 116. During the welding process, two sets of gas supply units 14 introduce protective gas from both ends of the pipe, which, together with the external jet nozzle of the welding execution head 112, achieves double-sided protection inside and outside. The extension pipe inside the pipe and the following nozzle 119 can be adjusted in position and angle synchronously with the welding head to achieve precise gas supply. During multi-layer welding, the locking force of locking component 19 increases with the number of welding layers to compensate for the fit gap caused by thermal expansion; the differential pressure linkage adjustment module balances the air pressure of the two end chambers in real time to avoid interfering with the formation of the back side of the molten pool.

[0035] This device effectively controls thermal deformation during the welding process of high-pressure boiler tubes through a dual-station, multi-point clamping structure, improving alignment accuracy. The design of dual-end gas filling combined with synchronous internal and external protection and follow-up targeted gas supply enhances the protection of the welding section 23 and reduces weld oxidation defects. The multi-dimensional adjustable welding execution structure offers greater adaptability, meeting the welding accuracy requirements of different pipe diameters and bevels. The openable track design improves the convenience of on-site assembly and disassembly. The linkage design, which links locking force with the number of welding layers and automatically balances the gas supply pressure difference, further ensures the process stability and weld formation quality of multi-layer, multi-pass welding.

[0036] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. An automated butt welding device for high-pressure boiler tubes, used for welding boiler pipes (21), characterized in that, include: The two sets of device frames (11) arranged opposite to each other, the clamping and positioning mechanism and the welding execution mechanism, also include a double-end gas-filling protection mechanism; The clamping and positioning mechanism is used to clamp the side of the boiler pipe (21) in a dual-station, multi-point manner. It includes two sets of boiler arc surface brackets (12), guide rail one (15) and a set of guide rail two (16). The two sets of boiler arc surface brackets (12) are respectively set on the two sides of the device frame (11). A docking plug seat (13) is installed on one set of boiler arc surface brackets (12). The two sets of guide rail one (15) and the set of guide rail two (16) are installed between the device frame (11) and the docking plug seat (13). Multiple sets of adjustable locking parts (19) are provided between guide rail one (15) and guide rail two (16). The locking parts (19) clamp the boiler pipe (21) from both sides. The welding actuator includes a welding travel track (110) and an adjustable arc track (111), on which a welding actuator head (112) capable of driving the movement is mounted. The gas-filled protection mechanism includes two sets of gas supply units (14), which are internally connected to two boiler pipes (21) and are used to introduce protective gas from both ends of the boiler pipes (21) to form a protective gas layer in the welding area.

2. The automated butt welding device for high-pressure boiler tubes according to claim 1, characterized in that, At least two sets of pipe joints (22) are provided on the boiler pipe (21). The connection between the pipe joint (22) and the boiler pipe (21) is a welded part (23). The welding execution head (112) is used to weld the welded part (23) along the annular path.

3. The automated butt welding device for high-pressure boiler tubes according to claim 2, characterized in that, The welding execution head (112) is also equipped with a jet nozzle. While welding, the welding execution head (112) also provides protective gas to the outside of the welded part (23). The gas filling protection mechanism is used to supply protective gas from the inside of the boiler pipe (21). The gas filling protection mechanism works in conjunction with the jet nozzle to simultaneously cover the inside and outside of the welded part (23) with protective gas.

4. The automated butt welding device for high-pressure boiler tubes according to claim 3, characterized in that, The gas-filling protection mechanism also includes an extension pipe and a follower nozzle (119). The extension pipe extends axially inside the boiler pipe (21). Multiple sets of follower nozzles (119) are provided and axially distributed on the extension pipe. The multiple sets of follower nozzles (119) can move and adjust axially on the extension pipe, and the follower nozzles (119) can rotate to ensure that the follower nozzles (119) and the welding actuator (112) are correspondingly set.

5. The automated butt welding device for high-pressure boiler tubes according to claim 1, characterized in that, A telescopic rod (18) is installed on the guide slide rail (15) via a guide slide block (17). A locking element (19) is adjustablely installed at the telescopic end of the telescopic rod (18). The guide slide block (17) and the telescopic rod (18) together achieve the position adjustment of the locking element (19).

6. The automated butt welding device for high-pressure boiler tubes according to claim 5, characterized in that, The adjustable arc track (111) is slidably mounted on the welding travel track (110) to enable the adjustable arc track (111) to travel axially along the boiler pipe (21). A guide slide (113) is installed on the adjustable arc track (111). A telescopic rod (115) is installed on the guide slide (113) via an angle adjustment seat (114). The welding actuator (112) is mounted on the telescopic end of the telescopic rod (115). The angle adjustment seat (114) is used to adjust the pitch angle and working deflection angle of the welding actuator (112). The telescopic rod (115) is used to adjust the radial feed of the welding actuator (112).

7. The automated butt welding device for high-pressure boiler tubes according to claim 6, characterized in that, The adjustable arc track (111) includes a track locking pivot (116) and two sets of adjustable arc tracks (111) that can be opened and closed. The adjustable arc track (111) is slidably installed on the welding travel track (110) above the track locking pivot (116). The adjustable arc track (111) is configured as an openable and closable structure.

8. The automated butt welding device for high-pressure boiler tubes according to claim 7, characterized in that, The clamping and positioning mechanism also includes a docking hole (117) and a docking joint (118). The axial sides of the boiler pipe (21) are respectively constrained by the docking hole (117) and the docking joint (118). Multiple sets of locking parts (19) form a multi-point clamping and fixing structure along the axial direction of the pipe body to suppress the pipe end deformation caused by welding heat input. Two sets of docking holes (117) are provided on one set of boiler arc support (12), and docking plug seat (13) is installed on another set of boiler arc support (12). Two sets of docking joints (118) are provided on the docking plug seat (13). The docking holes (117) and docking joints (118) are used for the insertion and positioning of the two ends of the boiler pipe (21).

9. The automated butt welding device for high-pressure boiler tubes according to claim 8, characterized in that, The welding execution head (112) performs multi-layer welding on the welding part (23), and the locking force of the locking member (19) is adapted to the number of welding layers. As the number of welding layers increases and the heat input of the pipe body accumulates, the locking force of the locking member (19) increases synchronously and gradually, compensating for the gap in the guide slide (17) caused by thermal expansion, and ensuring the axial position accuracy of the welding travel track (110).

10. The automated butt welding device for high-pressure boiler tubes according to claim 9, characterized in that, Two gas supply units (14) are equipped with differential pressure linkage adjustment modules to detect the gas pressure difference in the inner cavity at both ends of the boiler pipe (21) in real time. When the gas pressure difference exceeds the set threshold, the gas supply flow rate on the high-pressure side is automatically adjusted to maintain the gas pressure balance in the pipe and avoid gas pressure difference from disturbing the back of the molten pool.

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