Large-diameter nickel-based alloy composite pipe welding method and auxiliary device

Abstract

The application discloses a large-pipe-diameter nickel-based alloy composite pipe welding method and an auxiliary device, the composite pipe comprises a base layer and a complex layer, and the base layer is sleeved and covered outside the complex layer, the welding method comprises the following steps: step one, processing two groups of composite pipe to-be-welded end portions, forming X-type grooves at the to-be-welded end portion positions of the two groups of composite pipes, and then polishing the X-type grooves through the auxiliary device; step two, well aligning the two groups of composite pipes in a butt joint mode, and welding the base layer in the order of bottoming, filling and facing; and step three, then sequentially welding the transition layer and the complex layer in the order of bottoming, filling and facing. The X-type groove is adopted, and the double-sided welding mode is adopted, the whole welding process does not use argon back protection, compared with the traditional welding method, the welding material cost is saved, the welding work efficiency is improved, a large amount of argon is saved, the welding steps are simplified, the welding material cost is low, the welding layer number is small, the construction period is shortened, and energy saving and emission reduction are realized.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, specifically to a welding method and auxiliary device for large-diameter nickel-based alloy composite pipes. Background Technology

[0002] Traditional welding of large-diameter nickel-based alloy composite pipes typically employs conventional V-groove welding, single-sided welding, first welding the cladding and transition layers, then welding the base carbon steel section. This method requires the use of nickel-based alloy welding materials throughout. The inner cladding layer is welded using manual tungsten inert gas (TIG) welding, followed by manual shielded metal arc welding (SMAW) of the transition layer and base layer. Stainless steel and nickel-based alloy welding wires and electrodes are used for the transition layer between the cladding and base layers, as well as for all layered welds on the base layer. However, due to the high cost of stainless steel and nickel-based alloy welding materials, this welding method significantly increases welding costs and reduces welding efficiency. Therefore, we propose a welding method and auxiliary device for large-diameter nickel-based alloy composite pipes. Summary of the Invention

[0003] The purpose of this invention is to provide a welding method and auxiliary device for large-diameter nickel-based alloy composite pipes, so as to solve the problems of high welding cost and low welding efficiency of existing composite pipe welding methods mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A welding method for a large-diameter nickel-based alloy composite pipe, the large-diameter nickel-based alloy composite pipe comprising: a cladding layer and a base layer covering the cladding layer, the welding method comprising the following steps:

[0006] Step 1: Process the ends of the two sets of large-diameter nickel-based alloy composite pipes to be welded, so that the ends to be welded are formed with an X-shaped bevel. Then, the X-shaped bevel is ground with an auxiliary device.

[0007] Step 2: Assemble the two sets of large-diameter nickel-based alloy composite pipes by butt joint. After controlling the assembly gap, weld the base layer in the order of rooting, filling, and covering.

[0008] Step 3: Then, weld the transition layer and the top layer in the order of base coat, filler, and top coat;

[0009] The X-shaped bevel is formed along the entire circumference of the ends of the two sets of large-diameter nickel-based alloy composite pipes. The X-shaped bevel includes an upper funnel opening, a lower funnel opening, and a transition section. The upper funnel opening is formed upright in the radial direction on the base layer, and the lower funnel opening is formed inverted in the radial direction on the base layer and a portion of the cladding layer. The transition section connects the upper funnel opening and the lower funnel opening.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1) This invention adopts an X-shaped bevel and a double-sided welding method. First, carbon steel welding wire and electrode are used to weld the base layer, and then nickel-based alloy welding wire is used to weld the transition layer and the cladding layer in sequence. The entire welding process does not use argon back protection. Compared with traditional welding methods, it saves welding material costs, improves welding efficiency, saves a lot of argon, simplifies welding steps, and uses ordinary carbon steel for the base layer welding. The welding material cost is low and the number of welding layers is small, which shortens the construction period, saves energy and reduces emissions, and achieves good economic and social benefits.

[0012] 2) The present invention also includes an auxiliary device. After the X-shaped bevel is opened in the large-diameter nickel-based alloy composite pipe, the auxiliary device grinds each bevel surface of the X-shaped bevel to remove burrs and impurities, ensuring the welding quality of the nickel-based alloy composite pipe and further improving the welding efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the X-shaped bevel in the welding method of the present invention;

[0014] Figure 2 This is a schematic diagram of the two-diameter nickel-based alloy composite pipe assembly of the present invention;

[0015] Figure 3 This is a schematic diagram of the auxiliary device structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the locking component structure of the present invention;

[0017] Figure 5 This is a schematic diagram showing the contact between the grinding column and the transition section of the present invention;

[0018] Figure 6 This is a schematic diagram of the contact between the grinding column and the slope surface of the present invention.

[0019] In the diagram: 100, base layer; 200, multi-layer; 300, upper funnel opening; 301, slope one; 400, transition section; 401, slope two; 500, lower funnel opening; 501, slope three; 600, positioning part; 601, base; 602, pipe clamping mechanism; 603, double-acting screw; 604, rotating device one; 700, processing part; 701, sleeve; 702, guide seat; 703, arc-shaped guide groove one; 704. Rotating device II; 705. Telescopic device II; 706. Arc-shaped guide groove II; 707. Fixing block; 708. Grinding column; 709. Rotating sleeve; 710. Elastic component; 711. Electromagnetic component; 712. Pressure block; 713. Diverter component; 714. Nozzle; 715. Telescopic device III; 716. Bearing seat; 717. Gear set; 718. Rotating device III; 719. Telescopic device IV; 720. Baffle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 -Appendix Figure 2

[0022] A welding method for a large-diameter nickel-based alloy composite pipe, the large-diameter nickel-based alloy composite pipe comprising: a cladding layer 200 and a base layer 100 covering the cladding layer 200, the base layer 100 being ASTM A106, i.e., a carbon steel layer, and the cladding layer 200 being Incoloy 825.

[0023] The welding method includes the following steps:

[0024] Step 1: The ends of the two sets of large-diameter nickel-based alloy composite pipes to be welded are processed by machining to form an X-shaped bevel at the joint. Then, the X-shaped bevel is ground by an auxiliary device. The X-shaped bevel facilitates the welding of the large-diameter nickel-based alloy composite pipes.

[0025] Preferably, an X-shaped bevel is adopted, with the bevel angle c on the base layer 100 side being 60°-70°, the bevel angle on the overlay 200 side being 50°-60°, the root gap a being 2.8mm-4mm, the blunt edge length b being 1mm-3mm, and the distance from the root of the bevel of the base layer 100 to the joint surface between the base layer 100 and the overlay 200 being ≤4mm; the depth of the X-shaped bevel on the overlay 200 side is the thickness of the overlay 200 + 5mm, and the depth on the base layer 100 side is the thickness of the base layer 100 - 5mm - the blunt edge thickness;

[0026] Step 2: Assemble the two sets of large-diameter nickel-based alloy composite pipes by butt joint. After controlling the assembly gap, weld the base layer 100 in the order of rooting, filling, and covering.

[0027] Step 3: Then, weld the transition layer and the top layer 200 in the order of base coat, filler, and cover coat;

[0028] The X-shaped bevel is formed along the entire circumference of the ends of the two sets of large-diameter nickel-based alloy composite pipes. The X-shaped bevel includes an upper funnel opening 300, a lower funnel opening 500, and a transition section 400. Figure 3It can be seen that the upper funnel opening 300 has a vertically inclined slope 1 301, the lower funnel opening 500 has a vertically inclined slope 3 501, the slope 1 301 and the slope 3 501 have opposite inclination angles, and the transition section 400 has a vertically vertical slope 2 401. It should be noted that slope 1 301, slope 2 401 and slope 3 501 are all radially arranged at the end of the large-diameter nickel-based alloy composite pipe.

[0029] The upper funnel opening 300 is formed upright in the radial direction on the base layer 100, and the lower funnel opening 500 is formed inverted in the radial direction on the base layer 100 and the cladding layer 200 and on a portion of the cladding layer 200. The transition section 400 connects the upper funnel opening 300 and the lower funnel opening 500, and the transition section 400 has equal apertures in the radial direction.

[0030] Preferably, this embodiment employs a double-sided welding method. First, carbon steel welding wire and electrodes are used to weld the base layer 100, and then nickel-based alloy welding wire and electrodes are used to sequentially weld the transition layer and the cladding layer 200; wherein,

[0031] The thickness of the base layer 100 is 8.98mm-47mm, and the thickness of the overlay 200 is 3mm-5mm.

[0032] Preferably, in this embodiment, the weld seams on the base layer 100 side and the cladding layer 200 side are welded in layers and in passes. The passes are welded in a transverse oscillating manner, with the oscillation amplitude being less than 3 times the diameter of the welding wire or electrode.

[0033] Preferably, during the welding process, the interlayer temperature on the base layer 100 side is ≤250℃, and the interlayer temperature on the cladding layer 200 side is ≤100℃.

[0034] This implementation uses 5G butt welds, which are horizontal fixed welds, with the welding direction from bottom to top, specifically:

[0035] In step two, the number of welding passes on the 100 side of the base layer is determined according to the specific thickness of the carbon steel layer. As long as the width of each pass in each layer does not exceed three times the diameter of the selected welding material, it is fine.

[0036] The first and second layers of the X-groove base layer are welded using manual tungsten inert gas (TIG) welding. The welding material is E70S-2 welding wire with a specification of φ2.4. The welding current is 90-120A, the welding voltage is 10-14V, and the welding speed is 70-100mm / min. The remaining layers for filling and capping are welded using E7018 welding rods with a specification of φ3.2. The welding current is 90-130A, the welding voltage is 22-26V, and the welding speed is 88-138mm / min.

[0037] In step three, the cladding side welding is divided into 4 layers and 7 passes. All passes are welded by manual argon arc welding. The welding material is ERNiCrMo-3 with a specification of φ2.4. The welding current is 110-130A, the welding voltage is 9-12V, and the welding speed is 70-100mm / min.

[0038] When welding composite pipes with large diameters or composite plates, the first and second layers can be welded by manual tungsten inert gas welding, while other layers and passes can be welded by manual electric arc welding. The welding rod is ENiCrMo-3, the welding current is 90-110A, the welding voltage is 22-26V, and the welding speed is 88-118mm / min.

[0039] For manual tungsten inert gas (TIG) welding, the shielding gas is 99.99% argon with a flow rate of 12 L / min; the nozzle diameter is 10 mm and the extension length is 5 mm; ENiCrMo-3 welding electrodes do not require baking when first taken out of the vacuum packaging box. If not used within the specified time, baking is required at a temperature of 200-250℃ for 1 hour with a holding temperature of 120℃; E7018 welding electrodes require a baking temperature of 350℃ for 1 hour with a holding temperature of 150℃.

[0040] It should be noted that carbon steel can be used for grinding and cleaning the interlayer sides of the base layer 100; stainless steel must be used for grinding and cleaning the interlayer sides of the cladding layer 200. During welding, weld sequentially according to the process parameters and sequence of this invention, based on the thickness of the base layer 100 and the cladding layer 200, until the X-shaped bevel is filled. The smaller the thickness of the base layer 100 and the cladding layer 200, the fewer weld passes are required; the larger the thickness of the base layer 100 and the cladding layer 200, the more weld passes are required.

[0041] Please see the appendix Figure 3 -Appendix Figure 6

[0042] An auxiliary device for welding large-diameter nickel-based alloy composite pipes, applied to the above-mentioned welding method, the auxiliary device comprising:

[0043] Positioning unit 600, used for positioning two sets of large-diameter nickel-based alloy composite pipes to be processed; and,

[0044] The processing unit 700, located on the positioning unit 600, is used to grind the X-shaped bevel formed at one end of the two sets of large-diameter nickel-based alloy composite pipes to remove burrs and other defects at the X-shaped bevel.

[0045] Preferably, the positioning part 600 in this embodiment includes:

[0046] A base 601 has two sets of support seats slidably mounted on it. These support seats are threaded onto the outer ends of a bidirectional lead screw 603, which is rotatably mounted within the base 601. One end of the bidirectional lead screw 603 is connected to the output end of a rotating device 604 mounted on the base 601. This rotating device 604 is a servo motor and reducer. The rotating device 604 drives the bidirectional lead screw 603 to rotate, causing the two sets of support seats to move closer or further apart, thereby adjusting the distance between the two sets of large-diameter nickel-based alloy composite pipes.

[0047] Two sets of pipe clamping mechanisms 602 are respectively mounted on two sets of support seats for fixing two sets of large-diameter nickel-based alloy composite pipes to be processed. The pipe clamping mechanism 602 is a conventional mechanism in the field, such as a pipe clamper or a pipe clamping robot.

[0048] Preferably, the processing unit 700 in this embodiment includes:

[0049] Sleeve 701 is sleeved on the outer side of one end of two sets of large-diameter nickel-based alloy composite pipes. Sleeve 701 is coaxial with pipe clamping mechanism 602. The diameter of sleeve 701 is larger than the outer diameter of large-diameter nickel-based alloy composite pipes.

[0050] At least two sets of bearing seats 716 are respectively sleeved on the outer walls of both sides of the sleeve 701. The bottom of the at least two sets of bearing seats 716 is connected to the base 601 through the bracket. The sleeve 701 can rotate through the bearing seats 716 but will not move horizontally along its axis.

[0051] Rotating device 3 718 is mounted on a support. The output end of rotating device 3 718 is connected to sleeve 701 via gear set 717. Gear set 717 consists of two sets of meshing gears. Rotating device 3 718 is a servo motor and a reducer. Through rotating device 3 718 and gear set 717, sleeve 701 can rotate relative to the large-diameter nickel-based alloy composite pipe held by pipe clamping mechanism 602.

[0052] Two sets of grinding components are symmetrically arranged on the inner wall of sleeve 701. The grinding components include:

[0053] A guide seat 702 is disposed on the inner wall of the sleeve 701. The guide seat 702 has an arc-shaped guide groove 703 and an arc-shaped guide groove 706. One end of the arc-shaped guide groove 703 communicates with one end of the arc-shaped guide groove 706. A rotating device 704, such as a roller, is connected to the arc-shaped guide groove 703 via a sliding member. A grinding column 708 is detachably mounted on the output end of the rotating device 704, which is a grinding motor.

[0054] The fixing block 707 is disc-shaped and has a through hole through which the grinding post 708 passes. The through hole is provided with a locking member that is fixed to the outer wall of the grinding post 708 so that the fixing block 707 is fixed at a designated position on the outer wall of the grinding post 708, specifically at the lower end of the outer wall of the grinding post 708 or at the upper end of the outer wall of the grinding post 708.

[0055] The fixed block 707 is located at the output end of the rotating device four (not shown in the figure). The rotating device four is connected to one end of the telescopic device two 705 located on the sleeve 701. The telescopic device two 705 can be an electric telescopic device. The telescopic device two 705 is used to drive the fixed block 707 to move to the lower end or the upper end of the outer wall of the grinding column 708.

[0056] As attached Figure 4 As shown, when the fixed block 707 is at the lower end of the outer wall of the grinding column 708, the sliding part is at one end of the arc-shaped guide groove 703. At this time, the axis of the grinding column 708 is parallel to the inner wall of the lower funnel opening 500, that is, the grinding column 708 is in contact with the outer wall of the slope 501 of the lower funnel opening 500. The large-diameter nickel-based alloy composite pipe is moved by the positioning part 600 until the slope 501 contacts the grinding column 708. The grinding column 708 is driven to rotate by opening the rotating device 704, and the sleeve 701 is rotated 360 degrees by opening the rotating device 718. In this way, the area of ​​the slope 501 can be ground.

[0057] When the fixing block 707 is located at the upper end of the outer wall of the grinding column 708, as shown in the attached... Figure 5 -Appendix Figure 6 In the indicated state, the rotating device's four-wheel drive causes the fixed block 707 to drive the grinding column 708, positioning the sliding member at the other end of the arc-shaped guide groove 703. At this time, the axis of the grinding column 708 is parallel to the inner wall of the transition section 400, meaning the grinding column 708 contacts the outer wall of the second slope 401 of the transition section 400. The positioning part 600 moves the large-diameter nickel-based alloy composite pipe until the second slope 401 contacts the grinding column 708. By opening the second rotating device 704, the grinding column 708 is driven to rotate, and simultaneously, the third rotating device 718 is opened, causing the sleeve 701 to rotate 360 ​​degrees. Thus, the area of ​​the second slope 401 can be ground; and...

[0058] When the fixed block 707 is at the upper end of the outer wall of the grinding column 708, the four-wheel drive of the rotating device causes the fixed block 707 to drive the grinding column 708, so that the sliding part moves from one end of the arc-shaped guide groove 703 to one end of the arc-shaped guide groove 706. At this time, the axis of the grinding column 708 is parallel to the inner wall of the upper funnel opening 300, that is, the grinding column 708 contacts the outer wall of the slope 301 of the upper funnel opening 300. The positioning part 600 causes the large-diameter nickel-based alloy composite pipe to move until the slope 301 contacts the grinding column 708. By opening the rotating device 704, the grinding column 708 is driven to rotate. At the same time, the rotating device 718 is opened to make the sleeve 701 rotate 360 ​​degrees. In this way, the area of ​​the slope 301 can be ground.

[0059] Preferably, the locking element in this embodiment includes:

[0060] The rotating sleeve 709 is rotatably sleeved on the inner wall of the through hole and movably sleeved on the outer wall of the grinding column 708 via a bearing. The outer circumference of the rotating sleeve 709 has several through holes so that the subsequent electromagnetic component 711 can conduct magnetic force to the pressure block 712 when energized.

[0061] A plurality of pressure blocks 712 are intermittently arranged in a circular array within the rotating sleeve 709 for contacting the outer wall of the grinding column 708. A rubber layer may be provided on the side of the pressure block 712 that contacts the grinding column 708 to increase the frictional force between them. The pressure blocks 712 are magnetic pressure blocks, and are connected to the inner wall of the rotating sleeve 709 via elastic members 710, such as springs.

[0062] The electromagnetic component 711, which is ring-shaped, is embedded in the inner wall of the rotating sleeve 709 and corresponds to the through-hole. It is used to drive the pressure block 712 to contact the outer wall of the grinding column 708 when energized. When the electromagnetic component 711 is energized, it generates the same magnetic pole as the pressure block 712. Under the repulsive force of like poles, the pressure block 712 is tightly attached to the grinding column 708. At this time, the fixing block 707 is fixed to the outer wall of the grinding column 708. Because the electromagnetic component 711 is ring-shaped, when the grinding column 708 rotates, the pressure block 712 drives the rotating sleeve 709 to rotate relative to the fixing block 707, which will not affect the rotation of the grinding column 708.

[0063] In this way, when the rotating device drives the fixed block 707, the fixed block 707 can drive the grinding column 708 to rotate. When the telescopic device 2 705 drives the fixed block 707 to move, the electromagnetic component 711 can be de-energized. This changes the position of the fixed block 707 on the outer wall of the grinding column 708, thereby changing the rotation fulcrum of the grinding column 708. It should be noted that when the fixed block 707 is at the lower end of the outer wall of the grinding column 708, the output end of the rotating device 4 and the arc-shaped guide groove 1 703 are on the same axis. When the fixed block 707 is at the upper end of the outer wall of the grinding column 708, the output end of the rotating device 4 and the arc-shaped guide groove 2 706 are on the same axis. Furthermore, the length of the grinding column 708 is greater than the length of the slope 1 301, so that the grinding column 708 can grind the slope 1 301, slope 2 401 and slope 3 501 to remove the burrs on the outer wall of the X-shaped bevel.

[0064] Preferably, the processing unit 700 in this embodiment further includes:

[0065] A diverter 713 is disposed within the sleeve 701 and located between the two sets of grinding parts. One end of the diverter 713 is connected via a pipe to an external cleaning fluid supply device. This external cleaning fluid supply device is conventional in the art and will not be described in detail here; and...

[0066] Two sets of nozzles 714 are symmetrically spaced on both sides of the flow divider 713 and correspond to two sets of grinding parts respectively. The nozzles 714 are connected to the flow divider 713 through pipelines. The nozzles 714 are connected to the telescopic device 715 located on the outer wall of the flow divider 713. The telescopic device 715 is, for example, an electric telescopic device. The position of the nozzles 714 can be adjusted by the telescopic device 715 so that the nozzles 714 correspond to the slope 1 301, slope 2 401 and slope 3 501 respectively. The cleaning fluid sprayed by the nozzles 714 can clean the outer wall of the X-shaped bevel and improve the cleaning quality of the X-shaped bevel.

[0067] Preferably, in this embodiment, the sleeve 701 has baffles 720 symmetrically slidably mounted on both the upper and lower sides. The width of the baffles 720 is greater than or equal to the outer diameter of the sleeve 701. Each of the upper and lower baffles 720 has an arc-shaped groove at its opposite end that mates with the large-diameter nickel-based alloy composite pipe. A sealing ring can be embedded in the inner wall of the arc-shaped groove to ensure a tight seal between the baffles 720 and the large-diameter nickel-based alloy composite pipe, preventing damage to the outer wall of the large-diameter nickel-based alloy composite pipe caused by the baffles 720. The upper and lower baffles 720 are also respectively telescopically... The fourth device 719 is connected to the outer wall of the sleeve 701. The telescopic device 719 drives the baffle 720 to contact the outer wall of the large-diameter nickel-based alloy composite pipe, which can prevent the cleaning fluid in the sleeve 701 from leaking out of the sleeve 701. The lower baffle 720 is equipped with a drain connection pipe. After the X-shaped beveling treatment of the large-diameter nickel-based alloy composite pipe, a water pump can be connected from the drain connection pipe to extract the cleaning fluid in the sleeve 701. It should be noted that when extracting the cleaning fluid, it is necessary to ensure that the drain connection pipe is located at the lower end of the sleeve 701.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for welding large-diameter nickel-based alloy composite pipes, wherein the large-diameter nickel-based alloy composite pipe comprises: The cladding layer (200) and the base layer (100) covering the cladding layer (200) are characterized in that the auxiliary device is applied to a welding method for large-diameter nickel-based alloy composite pipes, the welding method comprising the following steps: Step 1: Process the ends of the two sets of large-diameter nickel-based alloy composite pipes to be welded, so that the ends to be welded are formed with an X-shaped bevel. Then, the X-shaped bevel is ground with an auxiliary device. Step 2: Assemble the two sets of large-diameter nickel-based alloy composite pipes by butt joint. After controlling the assembly gap, weld the base layer (100) in the order of rooting, filling and covering. Step 3: Then weld the transition layer and the overlay (200) in the order of base coat, filler, and top coat; The X-shaped bevel is formed on the entire circumference of the ends of the two sets of large-diameter nickel-based alloy composite pipes. The X-shaped bevel includes an upper funnel opening (300), a lower funnel opening (500), and a transition section (400). The upper funnel opening (300) is formed upright on the base layer (100) in the radial direction. The lower funnel opening (500) is formed inverted in the radial direction on the base layer (100) and the cladding layer (200) and on a part of the cladding layer (200). The transition section (400) connects the upper funnel opening (300) and the lower funnel opening (500). The auxiliary device includes: Positioning section (600), used for positioning two sets of large-diameter nickel-based alloy composite pipes to be processed; and, The processing unit (700) is located on the positioning unit (600) and is used to grind the X-shaped bevel formed at one end of the two sets of large-diameter nickel-based alloy composite pipes. The positioning part (600) includes: A base (601) has two sets of support seats slidably disposed on it. The two sets of support seats are threaded onto both ends of the outer wall of a bidirectional lead screw (603), which is rotatably disposed within the base (601). One end of the bidirectional lead screw (603) is connected to the output end of a rotating device (604) disposed on the base (601). Two sets of pipe clamping mechanisms (602) are respectively installed on two sets of support seats to fix the two sets of large-diameter nickel-based alloy composite pipes to be processed; The processing unit (700) includes: A sleeve (701) is fitted on the outer side of one end of two sets of large-diameter nickel-based alloy composite pipes. The sleeve (701) is coaxial with the pipe clamping mechanism (602). At least two sets of bearing seats (716) are respectively sleeved on the outer walls of both sides of the sleeve (701), and the bottom of the at least two sets of bearing seats (716) are connected to the base (601) through the bracket; Rotating device three (718) is mounted on a support, and the output end of the rotating device three (718) is connected to the sleeve (701) through a gear set (717); Two sets of grinding components are symmetrically arranged on the inner wall of the sleeve (701), the grinding components including: A guide seat (702) is provided on the inner wall of the sleeve (701). The guide seat (702) has an arc-shaped guide groove one (703) and an arc-shaped guide groove two (706). One end of the arc-shaped guide groove one (703) is connected to one end of the arc-shaped guide groove two (706). A rotating device two (704) is connected to the arc-shaped guide groove one (703) via a sliding member. The output end of the rotating device two (704) is detachably equipped with a grinding column (708); and... A fixed block (707) has a through hole through which a grinding column (708) passes. A locking element is provided within the through hole to fix the grinding column (708) to its outer wall. The fixed block (707) is located at the output end of a rotating device four. The rotating device four is connected at one end to a telescopic device two (705) located on a sleeve (701). The telescopic device two (705) is used to drive the fixed block (707) to move to the lower or upper end of the outer wall of the grinding column (708). When the fixed block (707) is at the lower end of the outer wall of the grinding column (708), the sliding element is at one end of the arc-shaped guide groove one (703). At this time, the shaft of the grinding column (708)... The line is parallel to the inner wall of the lower funnel opening (500); when the fixed block (707) is at the upper end of the outer wall of the grinding column (708), the rotating device drives the fixed block (707) to drive the grinding column (708) so that the sliding member is at the other end of the arc-shaped guide groove one (703), the axis of the grinding column (708) is parallel to the inner wall of the transition section (400), and the rotating device drives the fixed block (707) to drive the grinding column (708) so that the sliding member moves from the arc-shaped guide groove one (703) to one end of the arc-shaped guide groove two (706), at which time the axis of the grinding column (708) is parallel to the inner wall of the upper funnel opening (300).

2. The auxiliary device according to claim 1, characterized in that: A double-sided welding method is adopted. First, carbon steel welding wire and electrodes are used to weld the base layer (100), and then nickel-based alloy welding wire and electrodes are used to weld the transition layer and the cladding layer (200) in sequence; among which, The thickness of the base layer (100) is 8.98mm-47mm, and the thickness of the overlay layer (200) is 3mm-5mm.

3. The auxiliary device according to claim 1, characterized in that: The welds on the base layer (100) side and the cladding layer (200) side are welded in layers and in passes. The passes are welded in a transverse oscillating manner, with the oscillation amplitude being less than 3 times the diameter of the welding wire or electrode.

4. The auxiliary device according to claim 3, characterized in that: In step two, the first and second layers of the weld layer on the X-shaped groove base layer (100) side are welded using manual tungsten inert gas welding. The welding material is E70S-2 welding wire with a specification of φ2.

4. The welding current is 90-120A, the welding voltage is 10-14V, and the welding speed is 70-100mm / min. The remaining layers of filling and cover are welded using E7018 welding rods with a specification of φ3.

2. The welding current is 90-130A, the welding voltage is 22-26V, and the welding speed is 88-138mm / min. In step three, the X-shaped bevel cladding (200) side is welded using manual tungsten inert gas welding. The welding material is ERNiCrMo-3 welding wire with a specification of φ2.

4. The welding current is 110-130A, the welding voltage is 9-12V, and the welding speed is 70-100mm / min.

5. The auxiliary device according to claim 1, characterized in that: The locking element includes: A rotating sleeve (709) is rotatably mounted on the inner wall of the through hole and movably mounted on the outer wall of the grinding column (708). The outer circumferential wall of the rotating sleeve (709) has several through holes. A plurality of pressure blocks (712) are intermittently arranged in a circular array within the rotating sleeve (709) for contacting the outer wall of the grinding column (708). The pressure blocks (712) are magnetic pressure blocks, and are connected to the inner wall of the rotating sleeve (709) via elastic elements (710). The electromagnetic component (711) is ring-shaped and embedded in the inner wall of the rotating sleeve (709) and corresponds to the through-hole. It is used to drive the pressure block (712) to contact the outer wall of the grinding column (708) when energized.

6. The auxiliary device according to claim 5, characterized in that: The processing unit (700) further includes: A diverter (713) is disposed within a sleeve (701) and located between two sets of grinding parts. One end of the diverter (713) is connected to a device supplying cleaning fluid via a pipe. Two sets of nozzles (714) are symmetrically spaced on both sides of the flow divider (713) and correspond to two sets of grinding parts respectively. The nozzles (714) are connected to the flow divider (713) through pipelines. The nozzles (714) are connected to the telescopic device three (715) located on the outer wall of the flow divider (713).

7. The auxiliary device according to claim 6, characterized in that: Both ends of the sleeve (701) are symmetrically provided with baffles (720) on the upper and lower sides. The opposite ends of the upper and lower baffles (720) are provided with arc-shaped grooves that cooperate with large-diameter nickel-based alloy composite pipes. The upper and lower baffles (720) are also connected to the outer wall of the sleeve (701) through telescopic device four (719). The lower baffle (720) is provided with a drainage connection pipe.

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