Laser and TIG (Tungsten Inert Gas) magnetic control hybrid welding process for nickel-based alloy pipe production line

Abstract

The invention relates to the technical field of hybrid welding, in particular to a laser and TIG magnetic control hybrid welding process for a nickel-based alloy pipe production line, which comprises the following steps: pipe manufacturing, preparation, conveying and preheating, welding and cooling, equipment comprises a dust-free welding chamber and a welding pipe, a welding mechanism is arranged in the dust-free welding chamber, and the welding pipe is arranged in the dust-free welding chamber. The welding mechanism comprises a high-frequency pulse TIG welding gun and a laser transmitter, a magnetic field mechanism is arranged in the high-frequency pulse TIG welding gun, and a tungsten electrode end is arranged at the end, away from the adjusting frame, of the high-frequency pulse TIG welding gun. The method has the advantages that optical fiber laser welding is combined with the high-frequency pulse TIG arc and external alternating magnetic field technology, the welding speed is remarkably increased, rapid heating is achieved through optical fiber laser welding, the stirring and mixing effects of a molten pool are enhanced through adding of the high-frequency pulse TIG arc and the alternating magnetic field, the alternating magnetic field stirs the interior of the molten pool, grains are refined, and the overall performance of a welding seam is improved; therefore, thermal stress and deformation of weld metal are reduced, and welding efficiency and quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of composite welding, and in particular to a laser and TIG magnetron 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 advantages of high product quality, high production efficiency, energy saving and environmental protection, and low production cost. With the rapid development of science and technology, welding technology plays a vital role in transportation, oil pipelines, aerospace and other fields. Traditional arc welding is difficult to meet the use requirements of most equipment due to problems such as slow welding speed, low production efficiency, and large weld deformation. Laser welding is prone to spatter, cracks, pores and other problems because the welding material heats up and cools too quickly. Product quality and production efficiency have always been the focus and difficulty in the field of welding.

[0003] In the laser-TIG (Tungsten Inert Gas Welding) hybrid welding process, the laser's high power density can quickly heat up the base material at the bottom of the weld and generate plasma, while the ordinary TIG arc can improve the metal's energy absorption capacity and minimize energy loss. The laser and arc share a molten pool, which can give full play to the advantages of the laser's high melting depth and the arc's high melting width, and to a certain extent improve production efficiency and quality.

[0004] In recent years, many experts and scholars in welding have conducted detailed research on the addition of magnetic fields. During laser-TIG hybrid welding, the TIG arc may deviate from the center of the weld due to high welding speed or other unstable factors, thus affecting the quality of the weld. Since the plasma generated during laser and arc welding is conductive, the external magnetic field can effectively control the arc, constrain the arc in a stable area, improve the weld shape, regulate the weld microstructure, and ensure the stability of welding.

[0005] CN108655568A discloses a magnetic field assisted laser arc hybrid welding device and method for small diameter thin wall tubes. The method applies a magnetic field to the small diameter thin wall tube to assist the laser arc hybrid 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, which applies an alternating magnetic field to the emitting end of the arc heat source, and the arc acts on the welded part after passing through the alternating magnetic field, which can compress the arc and increase the energy density. However, the process uses a laser power of up to 60KW, which is costly and difficult to achieve in actual mass production. Summary of the invention

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

[0008] In order to achieve the above object, the present invention adopts the following technical scheme: a laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line, comprising the following steps: S1, pipe making, using the UOE forming section of the pipe production line to form the steel strip into a pipe to obtain a welded pipe; S2, preparation, filling the inert gas into the first sealed air inlet frame and the second sealed air inlet frame, forming a protective atmosphere inside the dust-free welding chamber, and energizing the winding coil; S3, conveying and preheating, putting the welding pipe into the dust-free welding chamber from the feed port, passing through the graphite plate in the first sealed air inlet frame to contact and fix with the conveying wheel, preheating the surface of the welding pipe, and the conveying wheel conveys the welding pipe to the welding section; S4, welding, start the high-frequency pulse TIG welding gun and the laser transmitter for welding, and use the fiber laser in front and the high-frequency pulse TIG welding gun in the back to weld, and the two share a molten pool. At the same time, the induction coil, the magnetic field generator and the magnetic pole tube generate an alternating magnetic field, and the TIG arc passes through the alternating magnetic field to act on the weld position of the welded pipe; S5, cooling down, welding is completed, and the straight seam welded pipe enters the second sealed air intake frame for cooling down; The laser-TIG magnetron hybrid welding process for the nickel-based alloy tube production line includes the following related equipment: a dust-free welding chamber and a welding tube, wherein a first sealed air inlet frame and a second sealed air inlet frame are provided in the dust-free welding chamber, a feed port and a discharge port are provided on the side wall of the dust-free welding chamber, wherein the first sealed air inlet frame corresponds to the feed port, and the second sealed air inlet frame corresponds to the discharge port, a conveying assembly is provided in the dust-free welding chamber, and a ventilation mechanism and a dust suction mechanism are provided on the outer wall of the dust-free welding chamber; A welding mechanism is arranged inside the dust-free welding chamber, and the welding mechanism includes a high-frequency pulse TIG welding gun and a laser transmitter. A magnetic field mechanism is arranged inside the high-frequency pulse TIG welding gun, and a tungsten pole tip is arranged at one end of the high-frequency pulse TIG welding gun away from the adjustment frame.

[0009] Preferably, the bottoms of the first sealed air inlet frame and the second sealed air inlet frame are respectively fixedly connected with support columns, and the bottoms of the support columns are fixedly connected to the bottom of the inner wall of the dust-free welding chamber.

[0010] Preferably, the conveying assembly comprises 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.

[0011] Preferably, a tubular graphite plate is fixedly mounted on the inner walls of the first sealed air intake frame and the second sealed air intake 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 intake frame, the winding coil is arranged on the outside of the corresponding graphite plate, and a sealing rubber plate is provided at the connection between the winding coil and the first sealed air intake frame.

[0012] Preferably, the ventilation mechanism includes a first air intake pump and a second air intake pump fixedly installed on the outer wall of the dust-free welding chamber, the first air intake pump is fixedly connected to the first sealed air intake frame with a first air intake pipe, the second air intake pump is fixedly connected to the second sealed air intake frame with a second air intake pipe, and the first air intake pump and the second air intake pump are both externally connected to an argon gas storage tank.

[0013] Preferably, the dust suction mechanism comprises a group of dust collectors fixedly mounted on the top of the dust-free welding chamber, the dust collectors are fixedly connected to the dust-free welding chamber via a suction pipe, and the dust suction mechanism is used to absorb smoke generated during welding.

[0014] 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 pulse TIG welding gun.

[0015] Preferably, an adjustment mounting tube is fixedly mounted on the top of the inner wall of the dust-free welding chamber, and the bottom of the adjustment mounting tube is fixedly connected to the top of the laser emitter.

[0016] Preferably, the magnetic field mechanism includes a magnetic pole tube fixedly installed at one end of the high-frequency pulse TIG welding gun away from the adjusting frame, the tungsten pole end is located in the magnetic pole tube, a magnetic field generator is fixedly installed on the inner wall of one end of the high-frequency pulse TIG welding gun close to the magnetic pole tube, an induction coil is provided on the outer wall of the magnetic field generator, and the induction coil is located inside the high-frequency pulse TIG welding gun.

[0017] Preferably, in step 4, the laser emitter is tilted forward and the angle between the central axis and the vertical direction is 5°, and the high-frequency pulse TIG welding gun is tilted backward and the angle between the high-frequency pulse TIG welding gun and the surface of the welding pipe is 40°.

[0018] Compared with the prior art, the advantages of the present invention are: The present invention can significantly improve the welding speed by arranging devices such as a high-frequency pulse TIG welding gun and a laser transmitter, and combining fiber laser welding with a high-frequency pulse TIG arc and an external alternating magnetic field technology. Fiber laser welding has the characteristics of high energy density and strong penetration, and can achieve rapid heating. The addition of high-frequency pulse TIG arc and alternating magnetic field enhances the stirring and mixing effect 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 is combined with the high-frequency pulse TIG arc to share a molten pool, giving full play to the advantages of the high melting depth of the laser and the high melting width of the arc. The alternating magnetic field stirs the inside of the molten pool, so that the internal energy field and temperature field are evenly distributed, which plays a role in refining the grains and increasing the overall performance of the weld, thereby ensuring the welding quality and effectively improving the welding speed.

[0019] In the present invention, the angle between the central axis of the forward-inclined laser emitter and the vertical direction is 5°, so that the laser energy can form a driving effect in 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 the discharge of gas and impurities in the molten pool, and reducing welding defects such as pores and slag inclusions. The angle between the backward-inclined high-frequency pulse TIG welding gun and the surface of the workpiece to be welded is 40°, so that the shielding gas can better cover the molten pool and the welding area, guide the shielding gas to flow along the molten pool and the weld surface, and form a good gas shield, thereby effectively improving the utilization efficiency of the shielding gas and ensuring the quality of the weld.

[0020] The present invention provides a first sealed air intake frame and a second sealed air intake frame and other devices, so that the inert gas escaping from the graphite plate lifts the welding tube, avoiding contact between the graphite plate and the welding tube, thereby reducing mechanical damage such as scratches and dents, and contactless transportation reduces the possibility of impurity adhesion. The inert gas simultaneously blows away impurities on the surface of the welding tube, providing a better environment for welding. The contactless transmission also plays a good buffering role, effectively reducing the vibration of the welding tube during transportation and improving the welding effect. The welding tube is preheated through heat transfer between the graphite plate and the inert gas, which reduces the temperature difference between the welding area and the surrounding area, reduces welding stress, and reduces the generation of welding cracks. The blowing of inert gas in the second sealed air intake frame not only helps to quickly cool down, but also effectively removes residual impurities in welding, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall axonometric structure of the equipment for the laser and TIG magnetron composite welding process for a nickel-based alloy tube production line proposed by the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of a dust-free welding chamber for a laser and TIG magnetic control composite welding process for a nickel-based alloy pipe production line proposed by the present invention.

[0023] Figure 3 The present invention is a schematic diagram of a support column and a transmission wheel structure for a laser and TIG magnetic control composite welding process for a nickel-based alloy tube production line.

[0024] Figure 4 This is a schematic diagram of the structure of a vacuum cleaner and a smoking pipe for a laser and TIG magnetron composite welding process for a nickel-based alloy tube production line proposed by the present invention.

[0025] Figure 5 This is a schematic structural diagram of a first sealed air intake frame and a second sealed air intake frame for a laser and TIG magnetron composite welding process for a nickel-based alloy tube production line proposed by the present invention.

[0026] Figure 6 This is a schematic diagram of a half-section structure of a dust-free welding chamber for a laser and TIG magnetic control composite welding process for a nickel-based alloy tube production line proposed by the present invention.

[0027] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part A.

[0028] In the figure: 1 dust-free welding room, 2 feed port, 3 vacuum cleaner, 4 smoking pipe, 5 first air intake pump, 6 second air intake pump, 7 first air intake pipe, 71 second air intake pipe, 8 welding pipe, 9 support column, 10 transmission wheel, 11 first sealed air intake frame, 12 graphite plate, 13 winding coil, 14 sealing rubber plate, 15 second sealed air intake frame, 16 adjustment frame, 17 high-frequency pulse TIG welding gun, 18 magnetic pole tube, 19 tungsten pole tip, 20 induction coil, 21 magnetic field generator, 22 adjustment installation tube, 23 laser transmitter. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] A laser and TIG magnetron hybrid welding process for a nickel-based alloy pipe production line comprises the following steps: S1, pipe making, using the UOE forming section of the pipe production line to form the steel strip into a tube to obtain a welded pipe 8, the UOE forming section is precisely controlled by a variable frequency servo motor to output power, and the wall thickness of the welded pipe 8 of the workpiece to be welded is 0.5-5.0 mm; S2, preparation, filling the first sealed air inlet frame 11 and the second sealed air inlet frame 15 with inert gas, energizing the winding coil 13 to heat the graphite plate 12 in the first sealed air inlet frame 11, the inert gas is argon gas, the argon gas flow rate is 15-25L / min, and the argon gas enters the dust-free welding chamber 1 to form a protective atmosphere; S3, conveying and preheating, putting the welding pipe 8 to be welded into the dust-free welding chamber 1 from the feed port 2, passing through the graphite plate 12 in the first sealed air inlet frame 11 to contact and fix with the conveying wheel 10, the inert gas in the first sealed air inlet frame 11 preheats the surface of the welding pipe 8 through heat transfer, and the conveying wheel 10 conveys the welding pipe 8 to the welding section of the dust-free welding chamber 1, and the conveying wheel 10 is precisely controlled by the variable frequency servo motor to output power; S4, welding, the notch of the welding pipe 8 is facing straight towards the muzzle of the high-frequency pulse TIG welding gun 17, the high-frequency pulse TIG welding gun 17 and the weld of the welding pipe 8 are in the same plane, the high-frequency pulse TIG welding gun 17 and the laser emitter 23 are started for welding, and the welding is performed in a manner of optical fiber laser in front and high-frequency pulse TIG welding gun 17 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 T high-frequency pulse TIG welding gun 17 and the surface of the welding pipe 8 of the workpiece to be welded is 40°, the distance between the bottom end of the laser emitter 23 and the welding pipe 8 of the workpiece to be welded is 500mm, the distance between the tungsten extreme end 19 of the high-frequency pulse TIG welding gun 17 and the welding pipe 8 of the workpiece to be welded is 1~3mm, and at the same time, the induction coil 20 and the magnetic field generator The alternating magnetic field generated by 21 and the magnetic pole tube 18 stirs the molten pool, the TIG arc passes through the alternating magnetic field and acts on the weld position of the welding pipe 8 of the workpiece to be welded, the vacuum cleaner 3 is started, and the smoking pipe 4 absorbs the smoke and impurities generated during welding. The effective output power of the laser transmitter 23 is 1000~4000W, the defocus amount is -1~-2mm, the high-frequency pulse current amplitude of the high-frequency pulse TIG welding gun 17 is preferably 200~300A, the high-frequency pulse current base value is preferably 100~150A, the pulse frequency is preferably 15.0~16.0kHZ, the alternating magnetic field current is 0.5~10A, the frequency is 100~8000HZ, the magnetic field strength is 5~40mT, the welding method is self-melting welding, no wire filling is required, and the welding speed is 1.0~10.0m / min; S5, cooling down. After welding is completed, the straight seam welded pipe is obtained. The straight seam welded pipe enters the second sealed air inlet frame 15, where it is cooled down under the blowing of inert gas argon. Meanwhile, residual impurities from welding are removed, and the pipe is cooled down to room temperature for subsequent processing.

[0031] Reference Figures 1 to 7, a laser-TIG magnetron hybrid welding process for a nickel-based alloy tube production line, comprising the following related equipment: a dust-free welding chamber 1 and a welding tube 8, the welding tube 8 is made by a UOE forming section of a tube production line of an external device that forms a steel strip into a tubular shape (this is the prior art), two support columns 9 are fixedly installed at the bottom of the inner wall of the dust-free welding chamber 1, the two support columns 9 are symmetrically distributed in the dust-free welding chamber 1, a first sealed air inlet frame 11 and a second sealed air inlet frame 15 are fixedly installed on the top of the two support columns 9, a side wall of the dust-free welding chamber 1 is provided with a feed port 2 and a discharge port, 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 Correspondingly, two groups of conveying wheels 10 are arranged inside the dust-free welding chamber 1, 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. The conveying wheels 10 are used to convey the welding pipe 8 from the feed port 2 to the discharge port. The UOE forming section and the two groups of conveying wheels 10 are driven by a gear box precisely controlled by a variable frequency servo motor. The inner walls of the first sealed air inlet frame 11 and the second sealed air inlet frame 15 are fixedly mounted with a tubular graphite plate 12, and the inner diameter of the graphite plate 12 is larger than the diameter of the welding pipe 8. The first sealed air inlet frame 11 is fixedly connected with a winding coil 13, which is arranged on the outside of the corresponding graphite plate 12, and the winding coil 13 is connected to the first sealed air inlet frame 11. A sealing rubber plate 14 is provided at the connection of the air intake frame 11 to ensure that the argon gas effectively passes through the graphite plate 12 and enters the dust-free welding chamber 1. The outer wall of the dust-free welding chamber 1 is fixedly installed with a first air intake pump 5 and a second air intake pump 6. The first air intake pump 5 is fixedly connected to the first sealed air intake frame 11 with a first air intake pipe 7, and the second air intake pump 6 is fixedly connected to the second sealed air intake frame 15 with a second air intake pipe 71. The first air intake pump 5 and the second air intake pump 6 are both externally connected to an inert gas storage tank (the inert gas is argon gas). The inert gas is filled into the first sealed air intake frame 11 and the second sealed air intake frame 15. The inert gas escapes from the graphite plate 12. The 15% porosity in the middle of the graphite material allows the inert gas to escape slowly. A protective atmosphere is formed in the dust-free welding chamber 1, which helps to prevent oxidation and nitridation of the weld metal and ensure the quality of the weld. The welding pipe 8 is placed in the dust-free welding chamber 1 from the feed port 2, passes through the middle of the graphite plate 12 and is fixed in contact with the conveying wheel 10. The inert gas escaping from the graphite plate 12 lifts the welding pipe 8 to achieve contactless transportation and avoid mechanical damage. The heating effect of the winding coil 13 is used to preheat the welding pipe 8 to reduce welding stress and welding cracks. The contactless transportation also plays a buffering role, reduces the influence of vibration on the position of the welding pipe 8, and improves the docking accuracy. The inert gas also helps to blow away surface impurities of the welding pipe 8, further improving the welding effect.

[0032] 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 through a smoking pipe 4 to absorb 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 groups of conveying wheels 10. The welding mechanism includes an adjustment frame 16 fixedly installed on the top of the inner wall of the dust-free welding chamber 1. A high-frequency pulse TIG welding gun 17 is fixedly connected to the bottom of the adjustment frame 16. The adjustment frame 16 is used to adjust the angle of the high-frequency pulse TIG welding gun 17. The high-frequency pulse TIG welding gun 17 is remotely controlled. A tungsten pole tip 19 is provided at one end away from the adjustment frame 16, a magnetic pole tube 18 is fixedly installed at one end of the high-frequency pulse TIG welding gun 17 away from the adjustment frame 16, the tungsten pole tip 19 is located in the magnetic pole tube 18, and the end away from the high-frequency pulse TIG welding gun 17 is flush with the end of the magnetic pole tube 18, a magnetic field generator 21 is fixedly installed on the inner wall of one end of the high-frequency pulse TIG welding gun 17 close to the magnetic pole tube 18, an induction coil 20 is provided on the outer wall of the magnetic field generator 21, and the induction coil 20 is located inside the high-frequency pulse TIG welding gun 17, and the top of the inner wall of the dust-free welding chamber 1 is fixedly installed There is an adjustable mounting tube 22, and a laser emitter 23 is fixedly connected to the bottom of the adjustable mounting tube 22. The adjustable mounting tube 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 pole tube 18 can stir the molten pool to 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 central axis of the forward-tilted laser emitter 23 is adjusted to be aligned with the vertical direction. The angle of the backward high-frequency pulse TIG welding gun 17 and the surface of the workpiece to be welded are 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 molten pool and the weld surface to form a good gas shield, effectively improve the utilization efficiency of the shielding gas, and ensure the quality of the weld.

[0033] In the present invention, the first air intake pump 5 and the second air intake pump 6 are respectively connected to the first sealed air intake frame 11 and the second sealed air intake frame 15 through the first air intake pipe 7 and the second air intake pipe 71. The first air intake pump 5 and the second air intake pump 6 are both externally connected to an inert gas storage tank. The first air intake pump 5 and the second air intake pump 6 are turned on, and the inert gas is filled into the first sealed air intake frame 11 and the second sealed air intake frame 15. The inert gas escapes from the graphite plate 12, which provides an inert gas environment in the dust-free welding chamber 1 and can provide auxiliary effects for subsequent feeding. The winding coil 13 is energized to start heating the graphite plate 12 in the first sealed air intake frame 11. There is no winding coil 13 in the second sealed air intake frame 15.

[0034] After the preparation work is completed, the welding pipe 8 to be welded is placed into the dust-free welding chamber 1 from the feed port 2, passes through the middle of the graphite plate 12, and contacts the rear conveying wheel 10 for fixing. This design has the following advantages: First, the inert gas released from the graphite plate 12 can first lift the welded pipe 8 so that there is no direct mechanical contact during transportation, so no mechanical damage such as scratches and dents will be left on the surface of the welded pipe 8; Second: through the contactless transportation of the graphite plate 12, the welding pipe 8 does not directly contact the ground or other solid transportation parts, which greatly reduces the possibility of impurities adhering. At the same time, the inert gas escaping from the graphite plate 12 can also blow away the impurities on the surface, providing a better welding environment and further improving the welding effect; Third: The contactless transmission of the graphite plate 12 can play a good buffering role, which can effectively reduce the vibration of the welded pipe 8 during transportation. For the welding of the welded pipe 8, the vibration can easily cause the position of the welded pipe 8 to shift, affecting the docking accuracy; Fourth: the winding coil 13 can heat the graphite plate 12, and the surface of the welded pipe 8 can be preheated through the heat transfer of the inert gas. Preheating can increase the overall temperature of the welded pipe 8, reduce the temperature difference between the welding area and the surrounding area, reduce welding stress, and reduce the generation of welding cracks.

[0035] Fifth: After welding, the second sealed air intake frame 15 is entered. The second sealed air intake frame 15 is not heated by the winding coil 13. It is cooled and the residual impurities of welding are removed under the blowing of inert gas to improve work efficiency.

[0036] When the conveyor wheel 10 moves to the bottom of the high-frequency pulse TIG welding gun 17, the welding work begins, and the high-frequency pulse TIG welding gun 17 and the laser emitter 23 are started. The large power density of the fiber laser can quickly heat up the base material below the weld and generate plasma. The high-frequency pulse TIG arc has stable energy concentration, which can improve the energy absorption capacity of the metal and minimize energy loss. The high-frequency oscillation effect can stir the molten pool, refine the grains, and improve the quality of the weld. The alternating magnetic field generated by the induction coil 20, the magnetic field generator 21 and the magnetic pole 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 production efficiency and production quality.

[0037] The angle between the central axis of the forward-tilted laser emitter 23 and the vertical direction is 5°. This tilt angle can make the laser energy form a driving effect in 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 conducive to the discharge of gas and impurities in the molten pool, and reducing welding defects such as pores and slag inclusions; the angle between the backward-tilted high-frequency pulse TIG welding gun 17 and the surface of the workpiece to be welded is 40°. The high-frequency pulse TIG welding gun 17 tilted backward by 40° can make the shielding gas better cover the molten pool and the welding area. 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 backward-tilted high-frequency pulse TIG welding gun 17 angle can guide the shielding gas to flow along the molten pool and the weld surface, forming a good gas shield, effectively improving the utilization efficiency of the shielding gas, and ensuring the quality of the weld.

[0038] In order to reduce the external pollution 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 suction and fume removal device: the angle of the smoke pipe 4 connected to the vacuum cleaner 3 is adjusted to ensure that the smoke and impurities generated during welding can be absorbed to reduce pollution.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line, characterized in that: The following steps are involved: S1, pipe making, using the UOE forming section of the pipe production line to form the steel strip into a pipe to obtain a welded pipe (8); S2, preparation, filling the first sealed air inlet frame (11) and the second sealed air inlet frame (15) with inert gas to form a protective atmosphere inside the dust-free welding chamber (1), and energizing the winding coil (13); S3, conveying and preheating, placing the welding tube (8) into the dust-free welding chamber (1) from the feed port (2), passing through the graphite plate (12) in the first sealed air inlet frame (11) to contact and fix with the conveying wheel (10), preheating the surface of the welding tube (8), and the conveying wheel (10) conveys the welding tube (8) to the welding section; S4, welding, starting the high-frequency pulse TIG welding gun (17) and the laser emitter (23) for welding, using the fiber laser in front and the high-frequency pulse TIG welding gun (17) in the back for welding, the two share a molten pool, and at the same time, the alternating magnetic field generated by the induction coil (20), the magnetic field generator (21) and the magnetic pole tube (18), the TIG arc passes through the alternating magnetic field and acts on the weld position of the welding pipe (8); S5, cooling down, welding is completed, and the obtained straight seam welded pipe enters the second sealed air intake frame (15) for cooling down; The laser-TIG magnetic control hybrid welding process for a nickel-based alloy tube production line comprises the following related equipment: a dust-free welding chamber (1) and a welding tube (8), wherein a first sealed air inlet frame (11) and a second sealed air inlet frame (15) are arranged in 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), wherein 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 in 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 comprising a high-frequency pulse TIG welding gun (17) and a laser emitter (23), a magnetic field mechanism is arranged inside the high-frequency pulse TIG welding gun (17), and a tungsten pole tip (19) is arranged at one end of the high-frequency pulse TIG welding gun (17) away from the adjustment frame (16).

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

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

4. The laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1 is characterized in that: A tubular graphite plate (12) is fixedly mounted on the inner walls of the first sealed air intake frame (11) and the second sealed air intake frame (15), the inner diameter of the graphite plate (12) being greater than the diameter of the welding tube (8), a winding coil (13) is fixedly connected to the first sealed air intake frame (11), the winding coil (13) being 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 intake frame (11).

5. The laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1 is characterized in that: The ventilation mechanism comprises a first air intake pump (5) and a second air intake pump (6) fixedly mounted on the outer wall of the dust-free welding chamber (1); the first air intake pump (5) is fixedly connected to a first sealed air intake frame (11) via a first air intake pipe (7); the second air intake pump (6) is fixedly connected to a second sealed air intake frame (15) via a second air intake pipe (71); and both the first air intake pump (5) and the second air intake pump (6) are externally connected to an argon gas storage tank.

6. The laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1 is characterized in that: The dust suction mechanism comprises a group of dust collectors (3) fixedly mounted on the top of the dust-free welding chamber (1); the dust collectors (3) are fixedly connected to the dust-free welding chamber (1) via a suction pipe (4); and the dust suction mechanism is used to absorb smoke generated during welding.

7. The laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1 is characterized in that: An adjustment frame (16) is fixedly mounted on the top of the inner wall of the dust-free welding chamber (1), and the bottom of the adjustment frame (16) is fixedly connected to the top of a high-frequency pulse TIG welding gun (17).

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

9. The laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1, characterized in that: The magnetic field mechanism comprises a magnetic pole tube (18) fixedly mounted on an end of the high-frequency pulse TIG welding gun (17) away from the adjustment frame (16); the tungsten pole tip (19) is located in the magnetic pole tube (18); a magnetic field generator (21) is fixedly mounted on an inner wall of an end of the high-frequency pulse TIG welding gun (17) close to the magnetic pole tube (18); an induction coil (20) is provided on an outer wall of the magnetic field generator (21); and the induction coil (20) is located inside the high-frequency pulse TIG welding gun (17).

10. The laser and TIG magnetron hybrid welding process for a nickel-based alloy tube production line according to claim 1, characterized in that: In step 4, the laser emitter (23) is tilted forward and the angle between the central axis and the vertical direction is 5°, and the high-frequency pulse TIG welding gun (17) is tilted backward and the angle between the high-frequency pulse TIG welding gun (17) and the surface of the welding pipe (8) is 40°.

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