A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line

Abstract

The present invention relates to the field of composite welding technology, and particularly to a laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line, which comprises the following steps: pipe making, preparation, conveying and preheating, welding, and cooling. The equipment includes a dust-free welding chamber and a welding pipe. A welding mechanism is arranged inside the dust-free welding chamber. The welding mechanism includes a high-frequency pulsed TIG welding torch and a laser emitter. A magnetic field mechanism is arranged inside the high-frequency pulsed TIG welding torch. A tungsten electrode tip is arranged at one end of the high-frequency pulsed TIG welding torch away from the adjusting frame. The advantages are as follows: The fiber laser welding combines with the high-frequency pulsed TIG arc and the externally applied alternating magnetic field technology, significantly improving the welding speed. The fiber laser welding realizes rapid heating. The addition of the high-frequency pulsed TIG arc and the alternating magnetic field enhances the stirring and mixing effects of the molten pool. The alternating magnetic field stirs the inside of the molten pool, refines the grains, increases the overall performance of the weld, thereby reducing the thermal stress and deformation of the weld metal, and improving the welding efficiency and quality.

Description

Technical Field

[0001] The present invention relates to the technical field of composite welding, and particularly relates to a laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line. Background Art

[0002] Nickel-based alloy pipe production lines have been widely used in many fields such as industrial manufacturing due to their high product quality, high production efficiency, energy conservation and environmental protection, and low production costs. With the rapid development of technology, welding technology plays a crucial role in fields such as transportation, oil pipelines, aerospace, etc. Traditional arc welding is difficult to meet the usage requirements of most equipment due to problems such as slow welding speed, low production efficiency, and large weld deformation. Laser welding is prone to problems such as spatter, cracks, and pores due to the too-fast heating and cooling speeds of the welding material. Product quality and production efficiency have always been the key points and difficulties in the welding field.

[0003] In the laser-TIG (Tungsten Inert Gas Welding) composite welding process, the high power density of the laser can rapidly heat the base metal at the lower end of the weld and generate plasma, and the ordinary TIG arc can improve the energy absorption capacity of the metal and minimize energy loss to the greatest extent. The laser and the arc share a molten pool, which can give full play to the advantages of the high penetration depth of the laser and the high width of the arc, and to a certain extent, improve the production efficiency and production quality.

[0004] In recent years, many welding experts and scholars have conducted detailed research on the addition of a magnetic field. During the laser-TIG composite welding process, the TIG arc may deviate from the center of the weld due to a large welding speed or other unstable factors, which will affect the weld quality. Since the plasma generated during the laser and arc welding processes has conductivity, an external magnetic field can effectively control the arc, confine the arc in a stable area, improve the weld forming shape, regulate the weld microstructure, and ensure the stability of welding.

[0005] CN108655568A discloses a device and method for magnetic field-assisted laser arc composite welding of small-diameter thin-walled pipes. This method applies a magnetic field to a small-diameter thin-walled pipe to assist the laser arc composite welding process, which can reduce pores and cracks. However, the weld quality of this process is not ideal and it is difficult to meet the production requirements.

[0006] CN117564473A discloses an alternating magnetic field-assisted high-power laser-arc hybrid welding method and device. By applying an alternating magnetic field to the emission end of the arc heat source, the arc acts on the welded part after passing through the alternating magnetic field, which can compress the arc and improve the energy density. However, the laser power used in this process is as high as 60KW, and its cost is relatively high, making it difficult to achieve in actual mass production processes. Summary of the Invention

[0007] The purpose of the present invention is to solve the disadvantages of poor weld quality and high cost in the prior art, and to propose a laser and TIG magnetic control hybrid welding process for a nickel-based alloy pipe production line.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions: A laser and TIG magnetic control hybrid welding process for a nickel-based alloy pipe production line, including the following steps:

[0009] S1. Pipe making: Use the UOE forming section of the pipe making production line to form the steel strip into a tubular shape to obtain a welded pipe.

[0010] S2. Preparation: Fill inert gas into the first sealed air inlet frame and the second sealed air inlet frame to form a protective atmosphere inside the dust-free welding chamber, and energize the winding coil.

[0011] S3. Feeding and preheating: Put the welded pipe into the dust-free welding chamber from the feeding port, pass through the graphite plate in the first sealed air inlet frame and contact and fix with the conveyor wheel, preheat the surface of the welded pipe, and the conveyor wheel transports the welded pipe to the welding section.

[0012] S4. Welding: Start the high-frequency pulse TIG welding torch and the laser emitter for welding. Welding is carried out in the way that the fiber laser is in the front and the high-frequency pulse TIG welding torch is in the back. The two share a molten pool. At the same time, the induction coil, the magnetic field generator and the magnetic tube generate an alternating magnetic field, and the TIG arc passes through the alternating magnetic field and acts on the weld position of the welded pipe.

[0013] S5. Cooling: After welding is completed, the obtained straight-seam welded pipe enters the second sealed air inlet frame for cooling.

[0014] The above-mentioned laser-TIG magnetic control hybrid welding process for a nickel-based alloy pipe production line includes the following related equipment: including a dust-free welding chamber and a welded pipe. The dust-free welding chamber is provided with a first sealed air inlet frame and a second sealed air inlet frame. The side wall of the dust-free welding chamber is provided with a feeding port and a discharging port. The first sealed air inlet frame corresponds to the feeding port, and the second sealed air inlet frame corresponds to the discharging port. A conveying assembly is arranged inside the dust-free welding chamber, and a ventilation mechanism and a dust suction mechanism are arranged on the outer wall of the dust-free welding chamber.

[0015] Inside the dust-free welding chamber, a welding mechanism is provided. The welding mechanism includes a high-frequency pulsed TIG welding torch and a laser emitter. A magnetic field mechanism is provided inside the high-frequency pulsed TIG welding torch. At one end of the high-frequency pulsed TIG welding torch away from the adjustment frame, a tungsten electrode tip is provided.

[0016] Preferably, support columns are respectively fixedly connected to the bottoms of the first sealed air inlet frame and the second sealed air inlet frame, and the bottoms of the support columns are fixedly connected to the bottom of the inner wall of the dust-free welding chamber.

[0017] Preferably, the conveying assembly includes two groups of conveying wheels, and the two groups of conveying wheels are symmetrically distributed between the first sealed air inlet frame and the second sealed air inlet frame.

[0018] Preferably, tubular graphite plates are fixedly installed on the inner walls of the first sealed air inlet frame and the second sealed air inlet frame. The inner diameter of the graphite plate is larger than the diameter of the welding tube. A winding coil is fixedly connected to the first sealed air inlet frame, and the winding coil is arranged outside the corresponding graphite plate. A sealing rubber plate is arranged at the connection between the winding coil and the first sealed air inlet frame.

[0019] Preferably, the air ventilation mechanism includes a first air inlet pump and a second air inlet pump fixedly installed on the outer wall of the dust-free welding chamber. The first air inlet pump is fixedly connected to the first sealed air inlet frame through a first air inlet pipe, and the second air inlet pump is fixedly connected to the second sealed air inlet frame through a second air inlet pipe. Both the first air inlet pump and the second air inlet pump are externally connected to an argon gas storage tank.

[0020] Preferably, the dust suction mechanism includes a group of dust collectors fixedly installed on the top of the dust-free welding chamber. The dust collectors are fixedly connected to the dust-free welding chamber through smoke pipes, and the dust suction mechanism is used to absorb the smoke generated during the welding process.

[0021] Preferably, an adjustment frame is fixedly installed on the top of the inner wall of the dust-free welding chamber, and the bottom of the adjustment frame is fixedly connected to the top of the high-frequency pulsed TIG welding torch.

[0022] Preferably, an adjustment installation pipe is fixedly installed on the top of the inner wall of the dust-free welding chamber, and the bottom of the adjustment installation pipe is fixedly connected to the top of the laser emitter.

[0023] Preferably, the magnetic field mechanism includes a magnetic tube fixedly installed at one end of the high-frequency pulsed TIG welding torch away from the adjustment frame. The tungsten electrode tip is located inside the magnetic tube. A magnetic field generator is fixedly installed on the inner wall of the high-frequency pulsed TIG welding torch near the magnetic tube, and an induction coil is arranged on the outer wall of the magnetic field generator and is located inside the high-frequency pulsed TIG welding torch.

[0024] Preferably, in step 4, the laser emitter inclines forward and the angle between its central axis and the vertical direction is 5°, and the high-frequency pulsed TIG welding torch inclines backward and the angle between it and the surface of the welded pipe is 40°.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] By arranging devices such as a high-frequency pulsed TIG welding torch and a laser emitter, the present invention combines fiber laser welding with high-frequency pulsed TIG arc and an external alternating magnetic field technology, which can significantly improve the welding speed. Fiber laser welding has the characteristics of high energy density and strong penetration, and can achieve rapid heating. The addition of high-frequency pulsed TIG arc and alternating magnetic field enhances the stirring and mixing effects of the molten pool, which is beneficial to reducing the thermal stress and deformation of the weld metal, thereby improving the welding efficiency and quality. The fiber laser and high-frequency pulsed TIG arc share a molten pool, giving full play to the advantages of the high penetration depth of the laser and the high penetration width of the arc. The alternating magnetic field stirs the inside of the molten pool, making the internal energy field and temperature field evenly distributed, playing a role in refining grains and increasing the overall performance of the weld, thus ensuring the welding quality and effectively improving the welding speed.

[0027] In the present invention, the angle between the central axis of the forward-inclined laser emitter and the vertical direction is 5°, which can form a pushing effect of laser energy at the front of the molten pool, prompting the molten pool metal to flow from front to back, making the molten pool more uniform, being beneficial to discharging gases and impurities in the molten pool, and reducing welding defects such as pores and slag inclusions. The backward-inclined high-frequency pulsed TIG welding torch has an angle of 40° with the surface of the workpiece to be welded, which can make the shielding gas better cover the molten pool and the welding area, guide the shielding gas to flow along the surface of the molten pool and the weld, and form a good gas shielding cover, thereby effectively improving the utilization efficiency of the shielding gas and ensuring the weld quality.

[0028] By arranging devices such as a first sealed air inlet frame and a second sealed air inlet frame, the inert gas escaping from the graphite plate lifts the welded pipe, avoiding the contact between the graphite plate and the welded pipe, thereby reducing mechanical damages such as scratches and dents. The non-contact transportation reduces the possibility of impurity adhesion. The inert gas also blows off the impurities on the surface of the welded pipe at the same time, providing a better environment for welding. The non-contact transmission also plays a good buffering role, effectively reducing the vibration suffered by the welded pipe during transportation and improving the welding effect. The welded pipe is preheated through the heat transfer of the graphite plate and the inert gas, reducing the temperature difference between the welding area and the surrounding area, reducing the welding stress, and reducing the generation of welding cracks. The blowing of the inert gas in the second sealed air inlet frame not only helps to quickly cool down, but also can effectively remove the welding residual impurities, improving the work efficiency. Description of the Drawings

[0029] Figure 1Schematic diagram of the overall axonometric structure of the equipment for the laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0030] Figure 2 Schematic diagram of the internal structure of the dust-free welding chamber for the laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0031] Figure 3 Schematic diagram of the support columns and conveyor wheels for the laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0032] Figure 4 Schematic diagram of the dust collector and smoke suction pipe for the laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0033] Figure 5 Schematic diagram of the first sealed air inlet frame and the second sealed air inlet frame for the laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0034] Figure 6 Schematic diagram of the half-section structure of the dust-free welding chamber for the laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0035] Figure 7 For Figure 6 Enlarged schematic diagram of part A in

[0036] In the figure: 1 Dust-free welding chamber, 2 Feed inlet, 3 Dust collector, 4 Smoke suction pipe, 5 First air inlet pump, 6 Second air inlet pump, 7 First air inlet pipe, 71 Second air inlet pipe, 8 Welding pipe, 9 Support column, 10 Conveyor wheel, 11 First sealed air inlet frame, 12 Graphite plate, 13 Winding coil, 14 Sealing rubber plate, 15 Second sealed air inlet frame, 16 Adjusting frame, 17 High-frequency pulsed TIG welding torch, 18 Magnetic tube, 19 Tungsten extreme head, 20 Induction coil, 21 Magnetic field generator, 22 Adjusting installation pipe, 23 Laser emitter. Specific implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0038] A laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line includes the following steps:

[0039] S1. Pipe manufacturing: The steel strip is formed into a welded pipe 8 by using the UOE forming section of the pipe manufacturing production line. The UOE forming section is powered by a gearbox precisely controlled by a variable-frequency servo motor. The wall thickness of the workpiece to be welded, i.e., the welded pipe 8, is 0.5 - 5.0 mm.

[0040] S2. Preparation: An inert gas is filled into the first sealed air inlet frame 11 and the second sealed air inlet frame 15. The winding coil 13 is energized to heat the graphite plate 12 in the first sealed air inlet frame 11. The inert gas is argon, and the argon flow rate is 15 - 25 L / min. The argon enters the dust-free welding chamber 1 to form a protective atmosphere.

[0041] S3. Conveying and preheating: The welded pipe 8 to be welded is put into the dust-free welding chamber 1 from the feed port 2, passes through the graphite plate 12 in the first sealed air inlet frame 11 and contacts and fixes with the conveyor wheel 10. The inert gas in the first sealed air inlet frame 11 preheats the surface of the welded pipe 8 through heat transfer. The conveyor wheel 10 conveys the welded pipe 8 to the welding section of the dust-free welding chamber 1. The conveyor wheel 10 is powered by a gearbox precisely controlled by a variable-frequency servo motor.

[0042] S4. Welding: The notch of the welded pipe 8 is directly facing the muzzle of the high-frequency pulsed TIG welding torch 17. The high-frequency pulsed TIG welding torch 17 and the weld seam of the welded pipe 8 are in the same plane. The high-frequency pulsed TIG welding torch 17 and the laser emitter 23 are started for welding. Welding is carried out in the way that the fiber laser is in the front and the high-frequency pulsed TIG welding torch 17 is in the back. The angle between the central axis of the forward-inclined laser emitter 23 and the vertical direction is 5°. The angle between the backward-inclined high-frequency pulsed TIG welding torch 17 and the surface of the workpiece to be welded, i.e., the welded pipe 8, is 40°. The distance between the bottom end of the laser emitter 23 and the workpiece to be welded, i.e., the welded pipe 8, is 500 mm. The distance between the tungsten extreme head 19 of the high-frequency pulsed TIG welding torch 17 and the workpiece to be welded, i.e., the welded pipe 8, is 1 - 3 mm. At the same time, an alternating magnetic field generated by the induction coil 20, the magnetic field generator 21 and the magnetic tube 18 stirs the molten pool. The TIG arc passes through the alternating magnetic field and acts on the weld seam position of the workpiece to be welded, i.e., the welded pipe 8. The dust collector 3 is started, and the smoke pipe 4 sucks the smoke and impurities generated during welding. The effective output power of the laser emitter 23 is 1000 - 4000 W, and the defocus amount is -1 - 2 mm. The amplitude of the high-frequency pulsed current of the high-frequency pulsed TIG welding torch 17 is preferably 200 - 300 A, the base value of the high-frequency pulsed current is preferably 100 - 150 A, the pulse frequency is preferably 15.0 - 16.0 kHz, the alternating magnetic field current is 0.5 - 10 A, the frequency is 100 - 8000 Hz, the magnetic field strength is 5 - 40 mT. The welding method is autogenous welding without filler wire, and the welding speed is 1.0 - 10.0 m / min.

[0043] S5. Cooling: After welding is completed, a straight-seam welded pipe is obtained. The straight-seam welded pipe enters the second sealed air inlet frame 15 and is cooled under the blowing of inert gas argon. At the same time, welding residual impurities are removed. After cooling to room temperature, subsequent processing operations are carried out.

[0044] Refer to Figures 1 to 7, a laser-TIG magnetron composite welding process for a nickel-based alloy pipe production line, includes the following related equipment: including a dust-free welding chamber 1 and a welding pipe 8. The welding pipe 8 is obtained by tubular forming of a steel strip by the UOE forming section of the pipe manufacturing production line of external equipment (this is the prior art). At the bottom of the inner wall of the dust-free welding chamber 1, two support columns 9 are fixedly installed. The two support columns 9 are symmetrically distributed in the dust-free welding chamber 1. At the tops of the two support columns 9, a first sealed air inlet frame 11 and a second sealed air inlet frame 15 are respectively fixedly installed. On the side wall of the dust-free welding chamber 1, a feed inlet 2 and a discharge outlet are provided. The first sealed air inlet frame 11 corresponds to the feed inlet 2, and the second sealed air inlet frame 15 corresponds to the discharge outlet. Inside the dust-free welding chamber 1, two groups of conveyor wheels 10 are provided. The two groups of conveyor wheels 10 are symmetrically distributed between the first sealed air inlet frame 11 and the second sealed air inlet frame 15. The conveyor wheels 10 are used to convey the welding pipe 8 from the feed inlet 2 to the discharge outlet. The UOE forming section and the two groups of conveyor wheels 10 are both powered by a gearbox precisely controlled by a variable-frequency servo motor. Tubular graphite plates 12 are fixedly installed on the inner walls of the first sealed air inlet frame 11 and the second sealed air inlet frame 15. The inner diameter of the graphite plate 12 is larger than the diameter of the welding pipe 8. A winding coil 13 is fixedly connected to the first sealed air inlet frame 11. The winding coil 13 is arranged outside the corresponding graphite plate 12. A sealing rubber plate 14 is provided at the connection between the winding coil 13 and the first sealed air inlet frame 11 to ensure that argon effectively passes through the graphite plate 12 and enters the dust-free welding chamber 1. A first air inlet pump 5 and a second air inlet pump 6 are fixedly installed on the outer wall of the dust-free welding chamber 1. The first air inlet pump 5 is fixedly connected to the first sealed air inlet frame 11 by a first air inlet pipe 7, and the second air inlet pump 6 is fixedly connected to the second sealed air inlet frame 15 by a second air inlet pipe 71. Both the first air inlet pump 5 and the second air inlet pump 6 are externally connected to an inert gas storage tank (the inert gas is argon). The inert gas is filled into the first sealed air inlet frame 11 and the second sealed air inlet frame 15. The inert gas escapes from the graphite plate 12. The porosity of 15% in the middle of the graphite material allows the inert gas to slowly escape and form a protective atmosphere in the dust-free welding chamber 1. The protective atmosphere helps prevent the oxidation and nitridation of the weld metal and ensures the weld quality. The welding pipe 8 is placed into the dust-free welding chamber 1 from the feed inlet 2, passes through the middle of the graphite plate 12 and contacts and is fixed to the conveyor wheels 10. The inert gas escaping from the graphite plate 12 lifts the welding pipe 8 to achieve non-contact transportation, avoiding mechanical damage. Using the heating effect of the winding coil 13, the welding pipe 8 is preheated to reduce welding stress and reduce welding cracks. The non-contact transportation also plays a buffering role, reducing the influence of vibration on the position of the welding pipe 8 and improving the docking accuracy. The inert gas also helps to blow away the surface impurities of the welding pipe 8, further improving the welding effect.

[0045] A group of dust collectors 3 are fixedly installed on the top of the dust-free welding chamber 1. The dust collector 3 is fixedly connected to the dust-free welding chamber 1 by a smoke suction pipe 4 to absorb the smoke and impurities generated during welding, which helps to reduce external pollution. A welding mechanism is arranged inside the dust-free welding chamber 1. The welding mechanism is located between two conveyor wheels 10. The welding mechanism includes an adjusting frame 16 fixedly installed on the top of the inner wall of the dust-free welding chamber 1. The bottom of the adjusting frame 16 is fixedly connected to a high-frequency pulse TIG welding torch 17. The adjusting frame 16 is used to adjust the angle of the high-frequency pulse TIG welding torch 17. One end of the high-frequency pulse TIG welding torch 17 away from the adjusting frame 16 is provided with a tungsten electrode tip 19. A magnetic tube 18 is fixedly installed at one end of the high-frequency pulse TIG welding torch 17 away from the adjusting frame 16. The tungsten electrode tip 19 is located inside the magnetic tube 18, and the end away from the high-frequency pulse TIG welding torch 17 is flush with the end of the magnetic tube 18. A magnetic field generator 21 is fixedly installed on the inner wall of the high-frequency pulse TIG welding torch 17 near the magnetic tube 18. An induction coil 20 is arranged on the outer wall of the magnetic field generator 21, and the induction coil 20 is located inside the high-frequency pulse TIG welding torch 17. An adjusting installation pipe 22 is fixedly installed on the top of the inner wall of the dust-free welding chamber 1. The bottom of the adjusting installation pipe 22 is fixedly connected to a laser emitter 23. The adjusting installation pipe 22 is used to adjust the angle of the laser emitter 23. The alternating magnetic field generated by the induction coil 20, the magnetic field generator 21 and the magnetic tube 18 can stir the molten pool, make the temperature more uniform, and improve the weld performance. The fiber laser is combined with the high-frequency pulse TIG arc, and the two share a molten pool, which can give full play to the advantages of the high melting depth of the laser and the high melting width of the arc, greatly improving the production efficiency and production quality. The angle between the central axis of the forward-tilted laser emitter 23 and the vertical direction is adjusted to 5°. This inclination angle can form a pushing effect of the laser energy at the front of the molten pool, prompting the molten pool metal to flow from front to back, making the molten pool more uniform, which is beneficial to discharging the gas and impurities in the molten pool, reducing welding defects such as pores and slag inclusions. The angle between the backward-tilted high-frequency pulse TIG welding torch 17 and the surface of the workpiece to be welded is adjusted to 40°, so that the shielding gas can better cover the molten pool and the welding area, and can guide the shielding gas to flow along the surface of the molten pool and the weld, forming a good gas shielding cover, effectively improving the utilization efficiency of the shielding gas and ensuring the weld quality.

[0046] In the present invention, the first intake pump 5 and the second intake pump 6 are respectively connected to the first sealed intake frame 11 and the second sealed intake frame 15 through the first intake pipe 7 and the second intake pipe 71. Both the first intake pump 5 and the second intake pump 6 are externally connected to an inert gas storage tank. The first intake pump 5 and the second intake pump 6 are turned on, and inert gas is filled into the first sealed intake frame 11 and the second sealed intake frame 15. The inert gas escapes from the graphite plate 12, providing an inert gas environment in the dust-free welding chamber 1 and can also play an auxiliary role for subsequent feeding. The winding coil 13 is energized to start heating the graphite plate 12 in the first sealed intake frame 11. There is no winding coil 13 in the second sealed intake frame 15.

[0047] After the preparatory work is completed, the welding pipe 8 to be welded is placed into the dust-free welding chamber 1 from the feeding port 2, passes through the middle of the graphite plate 12, and contacts the rear conveyor wheel 10 for fixation. Such a design has the following advantages:

[0048] First: The inert gas escaping from the graphite plate 12 can first lift the welding pipe 8, so that there is no direct mechanical contact during transportation, and thus no mechanical damages such as scratches and dents will be left on the surface of the welding pipe 8.

[0049] Second: Through the non-contact transportation by the graphite plate 12, the welding pipe 8 does not directly contact the ground or other solid transportation components, greatly reducing the possibility of impurity adhesion. At the same time, the inert gas escaping from the graphite plate 12 can also blow off the impurities on the surface, providing a better welding environment and further improving the welding effect.

[0050] Third: The non-contact transmission of the graphite plate 12 can play a good buffering role and can effectively reduce the vibration suffered by the welding pipe 8 during transportation. For the welding of the welding pipe 8, vibration is likely to cause the position deviation of the welding pipe 8, affecting the docking accuracy.

[0051] Fourth: The winding coil 13 can heat the graphite plate 12, and the surface of the welding pipe 8 can be preheated through the heat transfer of the inert gas. Preheating can increase the overall temperature of the welding pipe 8, reduce the temperature difference between the welding area and the surrounding area, reduce the welding stress, and reduce the generation of welding cracks.

[0052] Fifth: After welding, it enters the second sealed intake frame 15. The second sealed intake frame 15 has no heating by the winding coil 13 and cools down and removes welding residual impurities under the blowing of the inert gas, improving the work efficiency.

[0053] When it moves under the high-frequency pulsed TIG welding torch 17 through the transfer wheel 10, the welding operation starts. The high-frequency pulsed TIG welding torch 17 and the laser emitter 23 are activated. The relatively high power density of the fiber laser can rapidly heat up the base metal below the weld seam and generate plasma. The high-frequency pulsed TIG arc has stable and concentrated energy, which can improve the energy absorption capacity of the metal and minimize energy loss to the greatest extent. The high-frequency oscillation effect can stir the molten pool, refine the grains, and improve the weld quality. The alternating magnetic field generated by the induction coil 20, the magnetic field generator 21, and the magnetic tube 18 can stir the molten pool, making the temperature more uniform and improving the weld performance. The combination of the fiber laser and the high-frequency pulsed TIG arc shares a common molten pool, which can give full play to the advantages of the high penetration depth of the laser and the high weld width of the arc, greatly improving the production efficiency and the production quality.

[0054] The angle between the central axis of the forward-tilted laser emitter 23 and the vertical direction is 5°. This tilt angle can create a pushing effect of the laser energy at the front of the molten pool, prompting the molten pool metal to flow from front to back, making the molten pool more uniform, facilitating the discharge of gas and impurities in the molten pool, and reducing welding defects such as porosity and slag inclusions. The angle between the rear-tilted high-frequency pulsed TIG welding torch 17 and the surface of the workpiece to be welded is 40°. The rear-tilt of the high-frequency pulsed TIG welding torch 17 by 40° can better cover the molten pool and the welding area with the shielding gas. During the welding process, the main function of the shielding gas is to prevent harmful gases such as oxygen and nitrogen in the air from entering the molten pool and avoid oxidation and nitridation of the weld metal. The angle of the rear-tilted high-frequency pulsed TIG welding torch 17 can guide the shielding gas to flow along the surface of the molten pool and the weld seam, forming a good gas shielding cover, effectively improving the utilization efficiency of the shielding gas and ensuring the weld quality.

[0055] To minimize the external contamination during the welding process as much as possible, the entire welding process is carried out in a protective atmosphere and is equipped with a dust and fume suction device: adjust the angle of the suction pipe 4 connected to the vacuum cleaner 3 to ensure that the smoke and impurities generated during welding can be sucked to reduce contamination.

[0056] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line, characterized in that, It includes the following steps: S1. Pipe making: Use the UOE forming section of the pipe making production line to form the steel strip into a tubular shape to obtain a welded pipe (8). S2. Preparation: Fill inert gas into the first sealed air inlet frame (11) and the second sealed air inlet frame (15) to form a protective atmosphere inside the dust-free welding chamber (1), and energize the winding coil (13). S3. Transportation and preheating: Put the welded pipe (8) into the dust-free welding chamber (1) from the feed port (2), pass through the graphite plate (12) in the first sealed air inlet frame (11) and contact and fix with the conveyor wheel (10) to preheat the surface of the welded pipe (8), and the conveyor wheel (10) transports the welded pipe (8) to the welding section. S4. Welding: Start the high-frequency pulse TIG welding torch (17) and the laser emitter (23) for welding. Welding is carried out in the way that the fiber laser is in the front and the high-frequency pulse TIG welding torch (17) is in the back. The two share a molten pool. At the same time, an alternating magnetic field is generated by the induction coil (20), the magnetic field generator (21) and the magnetic tube (18), and the TIG arc passes through the alternating magnetic field and acts on the weld position of the welded pipe (8). S5. Cooling: After welding is completed, the obtained straight seam welded pipe enters the second sealed air inlet frame (15) for cooling. The above laser-TIG magnetron composite welding process for the nickel-based alloy pipe production line includes the following related equipment: including a dust-free welding chamber (1) and a welded pipe (8). A first sealed air inlet frame (11) and a second sealed air inlet frame (15) are arranged inside the dust-free welding chamber (1). A feed port (2) and a discharge port are arranged on the side wall of the dust-free welding chamber (1). The first sealed air inlet frame (11) corresponds to the feed port (2), and the second sealed air inlet frame (15) corresponds to the discharge port. A conveying assembly is arranged inside the dust-free welding chamber (1), and a ventilation mechanism and a dust suction mechanism are arranged on the outer wall of the dust-free welding chamber (1). A welding mechanism is arranged inside the dust-free welding chamber (1). The welding mechanism includes a high-frequency pulse TIG welding torch (17) and a laser emitter (23). A magnetic field mechanism is arranged inside the high-frequency pulse TIG welding torch (17), and a tungsten electrode tip (19) is arranged at one end of the high-frequency pulse TIG welding torch (17) far from the adjusting frame (16). The inner walls of the first sealed air inlet frame (11) and the second sealed air inlet frame (15) are both fixedly installed with tubular graphite plates (12). The inner diameter of the graphite plate (12) is larger than the diameter of the welded pipe (8). A winding coil (13) is fixedly connected to the first sealed air inlet frame (11). The winding coil (13) is arranged outside the corresponding graphite plate (12), and a sealing rubber plate (14) is arranged at the connection between the winding coil (13) and the first sealed air inlet frame (11).

2. The laser and TIG magnetron composite welding process for a nickel-based alloy tube production line according to claim 1, wherein Support columns (9) are respectively fixedly connected to the bottoms of the first sealed air inlet frame (11) and the second sealed air inlet frame (15), and the bottoms of the support columns (9) are fixedly connected to the inner wall bottom of the dust-free welding chamber (1).

3. A laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, The conveying assembly includes two groups of conveying wheels (10), and the two groups of conveying wheels (10) are symmetrically distributed between the first sealed air inlet frame (11) and the second sealed air inlet frame (15).

4. A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, The ventilation mechanism includes a first air inlet pump (5) and a second air inlet pump (6) fixedly installed on the outer wall of the dust-free welding chamber (1). The first air inlet pump (5) is fixedly connected to the first sealed air inlet frame (11) by a first air inlet pipe (7), and the second air inlet pump (6) is fixedly connected to the second sealed air inlet frame (15) by a second air inlet pipe (71). Both the first air inlet pump (5) and the second air inlet pump (6) are externally connected to an argon gas storage tank.

5. A laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, The dust suction mechanism includes a group of dust collectors (3) fixedly installed on the top of the dust-free welding chamber (1). The dust collector (3) is fixedly connected to the dust-free welding chamber (1) by a smoke suction pipe (4). The dust suction mechanism is used to absorb the smoke generated during the welding process.

6. A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, A regulating frame (16) is fixedly installed on the inner wall top of the dust-free welding chamber (1), and the bottom of the regulating frame (16) is fixedly connected to the top of the high-frequency pulsed TIG welding torch (17).

7. A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, A regulating installation pipe (22) is fixedly installed on the inner wall top of the dust-free welding chamber (1), and the bottom of the regulating installation pipe (22) is fixedly connected to the top of the laser emitter (23).

8. A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, The magnetic field mechanism includes a magnetic tube (18) fixedly installed at one end of the high-frequency pulsed TIG welding torch (17) away from the regulating frame (16). The tungsten electrode tip (19) is located inside the magnetic tube (18). A magnetic field generator (21) is fixedly installed on the inner wall of one end of the high-frequency pulsed TIG welding torch (17) close to the magnetic tube (18). An induction coil (20) is arranged on the outer wall of the magnetic field generator (21), and the induction coil (20) is located inside the high-frequency pulsed TIG welding torch (17).

9. A laser and TIG magnetron composite welding process for a nickel-based alloy tube production line according to claim 1, characterized in that, In step 4, the laser emitter (23) inclines forward and the angle between its central axis and the vertical direction is 5°, and the high-frequency pulsed TIG welding torch (17) inclines backward and the angle with the surface of the welding pipe (8) is 40°.

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