Device and Method for Removing Residual Stress in Circumferential Welding of Large Thin-Walled Cylinders

Abstract

The present invention discloses a device and method for removing residual stress from the circumferential weld of a large thin-walled cylinder, relating to the technical field of circumferential welding of large thin-walled cylinders, including an electromagnetic energy stress removal device and a pipe matching device. The pipe matching device can support the cylinder weldment or be supported on the cylinder weldment. The electromagnetic energy stress removal device can process the weld of the cylinder weldment under the combined action of electromagnetic energy and thermal energy. The electromagnetic energy stress removal device includes an induction heating magnetic head and an electromagnetic energy stress removal magnetic head. The present invention also discloses a method for removing residual stress from the circumferential weld of a large thin-walled cylinder. The present invention adopts the combined mode of electromagnetic energy and thermal energy to realize the transformation of residual stress from a high-energy state to an equilibrium position (low-energy state), thereby realizing the elimination of residual stress.

Description

Technical Field

[0001] The present invention relates to the technical field of circumferential welding of large thin-walled cylinders, and particularly to a device and method for removing residual stress in circumferential welding of large thin-walled cylinders for hydraulic equipment used in industries such as military, aerospace, and precision machining. Background Art

[0002] Welding is used in many fields such as petrochemical industry, pressure vessels, aerospace, transportation and construction. The common principle of the molten welding structure is that after the joint and the filler metal are melted, they are cooled and solidified at a relatively fast speed.

[0003] During the welding process, the welding joint material cools rapidly from the liquid state to the solid state and the temperature change is large, resulting in thermal expansion and contraction. Therefore, the volume of the welded part will shrink. Since the weld material is connected to the base material, the deformation is restricted, resulting in residual stress in the weld. The peak value, distribution, etc. of the residual stress in the welding joint will directly have a serious impact on the comprehensive mechanical properties, fatigue strength, buckling state, and even stress corrosion cracking of the welded part or other mechanical components. Therefore, removing the welding residual stress and equalizing the stress distribution are of great significance for improving the mechanical properties of the welded components, enhancing the stability, safety, and service life of chemical equipment pressure vessels.

[0004] For the treatment of welding residual stress, methods such as overall heat treatment, thermal aging, and vibration aging are basically adopted. Thermal aging can effectively reduce the residual stress, but the temperature control requirements are strict, and additional thermal stress is easily generated or the material surface oxidation is caused; the vibration aging method has a good improvement on the mechanical properties of the welded parts, but the disadvantage is that it is easy to cause the fatigue strength of the workpiece to not meet the standard after removing the residual stress.

[0005] Using the traditional method to treat welding residual stress is costly, inconvenient to carry, and there will be a softening problem in the subsequent treatment of materials by heat treatment methods; moreover, the above treatment methods are not very suitable for treating large thin-walled cylinders.

[0006] Therefore, there is an urgent need to provide a new device and method for removing residual stress in circumferential welding of large thin-walled cylinders to solve the above-mentioned disadvantages in the prior art. Summary of the Invention

[0007] The object of the present invention is to provide a device and method for removing residual stress in circumferential welding of large thin-walled cylinders to solve the problems existing in the above-mentioned prior art. By using the electromagnetic energy-thermal energy composite method, the residual stress is transformed from the high-energy state to the equilibrium position (low-energy state), thereby realizing the elimination of the residual stress.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a device for removing residual stress from the circumferential weld of a large thin-walled cylinder, comprising an electromagnetic energy stress removal device and a pipe matching device. The pipe matching device can support the cylinder weldment or be supported on the cylinder weldment. The electromagnetic energy stress removal device can process the weld of the cylinder weldment under the combined action of electromagnetic energy and thermal energy. The electromagnetic energy stress removal device includes an induction heating magnetic head and an electromagnetic energy stress removal magnetic head.

[0010] Preferably, the pipe matching device includes a track and a stepping trolley. The track surrounds the cylinder weldment and is arranged close to the weld. The stepping trolley can perform circular motion on the track, and the electromagnetic energy stress removal device is installed on the stepping trolley.

[0011] Preferably, a fixing plate is installed on the stepping trolley through a spacing adjustment mechanism. The electromagnetic energy stress removal device is installed on the fixing plate, and the spacing adjustment mechanism can adjust the height distance and left-right deviation between the electromagnetic energy stress removal device and the weld.

[0012] Preferably, the track is equipped with a flexible adjustment track tooling, and limit holes can be opened on the track.

[0013] Preferably, the pipe matching device includes supporting wheels, a hydraulic lifting platform and a support frame. The support frame can support the cylinder weldment. The supporting wheels are installed on the support frame and are in contact with the cylinder weldment. The electromagnetic energy stress removal device is installed on the hydraulic lifting platform;

[0014] The supporting wheels are connected with a rotating motor, and the rotating motor drives the supporting wheels to rotate.

[0015] Preferably, a fixing plate is installed on the top of the hydraulic lifting platform, and the electromagnetic energy stress removal device is installed on the fixing plate.

[0016] Preferably, the induction heating magnetic head includes an induction heating magnetic head iron core and an induction heating magnetic head coil. The induction heating magnetic head coil surrounds the induction heating magnetic head iron core, and the induction heating magnetic head coil can be connected to a 300 - 300 kHz intermediate frequency induction power supply for preheating.

[0017] Preferably, the electromagnetic energy stress removal magnetic head includes an electromagnetic energy stress removal magnetic head iron core and an electromagnetic energy stress removal magnetic head coil. The electromagnetic energy stress removal magnetic head coil surrounds the electromagnetic energy stress removal magnetic head iron core, and the electromagnetic energy stress removal magnetic head coil can be connected to a dedicated power supply for controllable electromagnetic energy CEME to eliminate stress.

[0018] Preferably, the diameter of the cylinder weldment is 10 m and the wall thickness is 10 mm.

[0019] The present invention also discloses a method for removing residual stress from the circumferential weld of a large thin-walled cylinder. Using the above-mentioned device for removing residual stress from the circumferential weld of a large thin-walled cylinder, the method includes the following steps:

[0020] Step 1: Weld the cylinder weldment;

[0021] Step 2: Install the welded cylinder weldment and the pipeline matching device, and install the electromagnetic energy stress removal device;

[0022] Step 3: Rotate the cylinder weldment and the pipeline matching device relative to each other, and process the weld of the cylinder weldment through the electromagnetic energy stress removal device.

[0023] The present invention has achieved the following beneficial technical effects compared with the prior art:

[0024] The device for removing residual stress from the circumferential weld of a large thin-walled cylinder provided by the present invention uses the combined action of magnetism and heat, and has a good effect of removing residual stress in the residual stress area of the weld of the weldment. Moreover, it adopts a non-contact method and will not affect the performance of the workpiece;

[0025] The electromagnetic energy stress removal device uses the simultaneous action of electromagnetic heat and electromagnetic field, which greatly improves the operation and the efficiency of removing residual stress, and shortens the production cycle of the product;

[0026] The electromagnetic energy stress removal device has adjustable parameters, a wide application range, and is easy to carry, making it suitable for different working environments. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is the isometric view of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in Embodiment 1;

[0029] Figure 2 is the front view of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in Embodiment 1;

[0030] Figure 3 is the left view of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in Embodiment 1;

[0031] Figure 4 is the structural schematic diagram of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in Embodiment 2;

[0032] Figure 5 It is the base diagram of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in the second embodiment;

[0033] Figure 6 It is the isometric view of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in the second embodiment;

[0034] Figure 7 It is the front view of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in the second embodiment;

[0035] Figure 8 It is the left view of the device for removing residual stress from the circumferential weld of a large thin-walled cylinder in the second embodiment;

[0036] Figure 9 It is the schematic diagram of testing residual stress by the drilling strain method in the fourth embodiment;

[0037] Explanation of reference numerals: 1 - Weld seam, 2 - Track, 3 - Cylindrical weldment, 4 - Electromagnetic energy stress removal magnetic head coil, 5 - Induction heating magnetic head coil, 6 - Induction heating magnetic head iron core, 7 - Fixed plate, 8 - Electromagnetic energy stress removal magnetic head iron core, 9 - Spacing adjustment mechanism, 10 - Stepping trolley, 11 - Support frame, 12 - Electromagnetic energy stress removal device, 13 - Support wheel, 14 - Rotating motor, 15 - Hydraulic lifting platform. Detailed implementation manners

[0038] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The purpose of the present invention is to provide a device and method for removing residual stress from the circumferential weld of a large thin-walled cylinder, so as to solve the problems existing in the prior art. By adopting the compound method of electromagnetic energy - heat energy, the transformation of residual stress from a high-energy state to an equilibrium position (low-energy state) is realized, thereby achieving the elimination of residual stress.

[0040] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0041] Embodiment 1

[0042] Such as Figures 1-3As shown in the figure, in this embodiment, a device for removing residual stress from the circumferential weld of a large thin-walled cylinder is provided, which includes an electromagnetic energy stress removal device 12 and a pipe matching device. The pipe matching device can support the cylinder weldment 3 or be supported on the cylinder weldment 3. The electromagnetic energy stress removal device 12 can process the weld 1 of the cylinder weldment 3 under the combined action of electromagnetic energy and heat energy. The electromagnetic energy stress removal device 12 includes an induction heating magnetic head and an electromagnetic energy stress removal magnetic head.

[0043] In this embodiment, the pipe matching device includes a track 2 and a stepping trolley 10. The track 2 is arranged around the weld 1 of the large thin-walled cylinder weldment 3. The electromagnetic energy stress removal device 12 is installed on the stepping trolley 10, and the stepping trolley 10 will perform a circular motion on the track 2 to perform the residual stress removal process.

[0044] In this embodiment, the electromagnetic energy stress removal magnetic head is mainly composed of an electromagnetic energy stress removal magnetic head iron core 8 and an electromagnetic energy stress removal magnetic head coil 4, and the induction heating magnetic head is mainly composed of an induction heating magnetic head iron core 6 and an induction heating magnetic head coil 5. The electromagnetic energy stress removal magnetic head coil 4 is connected to a controllable electromagnetic energy CEME special power supply for stress elimination, and the induction heating magnetic head coil 5 is connected to a 300 - 300 kHz intermediate frequency induction power supply for preheating.

[0045] In this embodiment, a spacing adjustment mechanism 9 and a fixing plate 7 are installed on the stepping trolley 10, which can adjust the height distance and left - right deviation between the electromagnetic energy stress removal device 12 and the weld 1. Specifically, the spacing adjustment mechanism 9 includes an adjustment block and an adjustment rod. The adjustment block is slidably installed left - right on the stepping trolley 10, the adjustment rod is slidably installed up - down on the adjustment block, the fixing plate 7 is connected to the adjustment rod, and the electromagnetic energy stress removal device 12 is installed on the fixing plate 7. By moving the adjustment block and the adjustment rod, the fixing plate 7 and the electromagnetic energy stress removal device 12 thereon are driven to move, so as to adjust the height distance and left - right deviation between it and the weld 1. Among them, the spacing adjustment mechanism 9 can also select other adjustment mechanisms according to the working needs. The stepping trolley 10 uses an AC variable - frequency motor for variable - frequency speed regulation, and travels on the track 2 through rollers. The stepping trolley 10 and the track 2 are driven by a worm and a worm gear to travel, or other transmission mechanisms can be used according to the working needs. High - quality polyurethane or metal rollers are assembled on the stepping trolley 10, and the mechanical operation is stable. The stepping trolley 10 is equipped with an automatic traveling system, which can adjust the electromagnetic energy processing time according to the speed of the stepping trolley 10: 5 mm / s - 30 mm / s.

[0046] In this embodiment, the track 2 can adapt to workpieces with different diameters by adjusting the track tooling (flexible), and the track tooling is selected from the prior art according to the working needs; and limit holes suitable for the stepping trolley 10 are opened on the track 2 for the stepping trolley 10 to move forward.

[0047] In the actual site, first, the cylindrical weldment 3 is wound around an orbit 2. A stepping trolley 10 is placed on the orbit 2. An electromagnetic energy stress relieving device 12 is placed on a fixing plate 7 on the stepping trolley 10. The spacing adjustment mechanism 9 on the stepping trolley 10 is adjusted so that the electromagnetic energy stress relieving device 12 is just above the weld 1. The electromagnetic energy stress relieving device 12 is placed on the fixing plate 7. The induction heating magnetic head coil 5 is connected to a 300 - 300 kHz intermediate frequency induction power supply for preheating. At the same time, the electromagnetic energy stress relieving magnetic head coil 4 is connected to a special power supply for controllable electromagnetic energy CEME for stress elimination. Finally, the stepping trolley 10 runs on the orbit 2 to process and remove the residual stress.

[0048] The requirements for the device for removing residual stress from the circumferential weld of a large - diameter thin - walled cylinder in this embodiment are as follows:

[0049] In this embodiment, for the induction heating magnetic head, local induction low - temperature preheating treatment of the weld 1 is carried out. The induction heating magnetic head coil 5 is connected to a 300 - 300 kHz intermediate frequency induction power supply to achieve a better stress - relieving effect, and the preheating temperature is 100 - 300 °C.

[0050] In this embodiment, for the electromagnetic energy stress relieving magnetic head, the electromagnetic energy stress relieving magnetic head coil 4 is connected to a special power supply for controllable electromagnetic energy CEME for electromagnetic energy stress removal, and the stress elimination rate is 30 - 70%.

[0051] In this embodiment, the spacing adjustment mechanism 9 on the stepping trolley 10 has an adjustment range of 10 - 100 mm, which is suitable for adjusting the working distance between the electromagnetic energy stress relieving device 12 and the cylindrical weldment 3.

[0052] In this embodiment, there is an automatic traveling system on the stepping trolley 10, and the electromagnetic energy processing time is adjusted according to the speed of the stepping trolley 10: 5 mm / s - 30 mm / s.

[0053] In this embodiment, the stepping trolley 10 runs on the orbit 2 and travels by engaging with the orbit through gears.

[0054] In this embodiment, the orbit 2 is equipped with an adjustable track tooling (flexible) to adapt to cylindrical weldments 3 with different diameters.

[0055] In this embodiment, the cylindrical weldment 3 has a diameter of 10 m and a wall thickness of 10 mm.

[0056] Embodiment Two

[0057] This embodiment is an improvement based on Embodiment One, and the improvement lies in:

[0058] As Figures 4-8As shown in the figure, the pipe matching device mainly includes a support wheel 13, a hydraulic lifting platform 15 and a support frame 11; the support frame 11 is used to support the cylindrical welded part 3, and the support wheel 13 is installed on the support frame 11, and the support wheel 13 contacts the cylindrical welded part 3. When the rotating motor 14 on the support frame 11 drives the support wheel 13 to rotate, the cylindrical welded part 3 also rotates, and the electromagnetic energy stress relieving device 12 located at the bottom processes the weld 1.

[0059] In this embodiment, the electromagnetic energy stress relieving device 12 is mainly composed of an electromagnetic energy stress relieving magnetic head and an induction heating magnetic head; among them, the electromagnetic energy stress relieving magnetic head is mainly composed of an electromagnetic energy stress relieving magnetic head iron core 8 and an electromagnetic energy stress relieving magnetic head coil 4, and the induction heating magnetic head is mainly composed of an induction heating magnetic head iron core 6 and an induction heating magnetic head coil 5. The electromagnetic energy stress relieving magnetic head coil 4 is connected to a controllable electromagnetic energy CEME special power supply for stress elimination; the induction heating magnetic head coil 5 is connected to a 300 - 300 kHz intermediate frequency induction power supply for preheating.

[0060] In this embodiment, the electromagnetic energy stress relieving device 12 is placed at the bottom of the cylindrical welded part 3, and the electromagnetic energy stress relieving device 12 is installed on the hydraulic lifting platform 15 at the bottom, which is used to adjust the height distance between the electromagnetic energy stress relieving device 12 and the weld 1.

[0061] In this embodiment, a rotating motor 14 is installed on the support frame 11 to drive the support wheel 13 to rotate the cylindrical welded part 3.

[0062] In the actual site, first adjust the distance between the two support frames 11 according to the size of the cylindrical welded part 3, then place the cylindrical welded part 3 on the support frame 11 in contact with the support wheel 13, place the hydraulic lifting platform 15 between the two support frames 11, and the electromagnetic energy stress relieving device 12 is installed on the fixed plate 7 of the hydraulic lifting platform 15 so that the electromagnetic energy stress relieving device 12 is directly below the weld 1, and adjust the hydraulic lifting platform 15 to make the electromagnetic energy stress relieving device 12 at a suitable distance from the weld 1. The induction heating magnetic head coil 5 is connected to a 300 - 300 kHz intermediate frequency induction power supply for preheating; at the same time, the electromagnetic energy stress relieving magnetic head coil 4 is connected to a controllable electromagnetic energy CEME special power supply for stress elimination. Finally, turn on the rotating motor 14 to drive the support wheel 13 to rotate the whole workpiece to eliminate the residual stress.

[0063] The technical requirements of this embodiment for the device for removing residual stress in the circumferential welding of large - diameter thin - wall cylinders:

[0064] For the induction heating magnetic head, local induction low - temperature preheating treatment of the weld 1 is carried out. The induction heating magnetic head coil 5 is connected to a 300 - 300 kHz intermediate frequency induction power supply to achieve a better stress - relieving effect, and the preheating temperature is 100 - 300 °C.

[0065] Electromagnetic energy stress relief head. The electromagnetic energy stress relief head coil 4 is connected to a dedicated power supply for controllable electromagnetic energy (CEME). Electromagnetic energy stress removal, with a stress elimination rate of 30% - 70%.

[0066] Hydraulic lift table 15. During electromagnetic energy stress relief and induction heating, it should face the weld seam 1 directly. The working distance can be adjusted through the hydraulic lift table 15, with an adjustment range of 10 - 300 mm.

[0067] Support frame 11, suitable for the support and rotation of circular circumferential welded workpieces such as rotating workpieces, pressure vessels, and pipelines. In this embodiment, the cylindrical welded workpiece 3 is used for illustration. The cylindrical welded workpiece 3 is placed on the main and driven support wheels, and the weld seam 1 of the cylindrical welded workpiece 3 is placed therebetween. The driven support wheel rotates through the rotation motor 14, driving the cylindrical welded workpiece 3 to rotate. The electromagnetic energy aging treatment time is adjusted by controlling the rotation speed. The efficiency of electromagnetic energy treatment: 5 mm / s - 30 mm / s.

[0068] Support wheel 13, made of high-quality polyurethane or metal rollers to make the mechanical operation stable. The inclination angle of the rollers can be adjusted to adapt to cylindrical welded workpieces 3 with different diameters.

[0069] Cylindrical welded workpiece 3, with a diameter of 10 m and a wall thickness of 10 mm.

[0070] Embodiment Three

[0071] This embodiment further elaborates in detail on the process of removing residual stress from SA508 - 4 steel.

[0072] Two pieces of SA508 - 4 steel are welded together, and the welded part is subjected to electromagnetic energy residual stress removal treatment. The induction heating head and the electromagnetic energy stress relief head are arranged in a row and moved at a speed of 10 mm / s. The distance between the heads and the welded part is 10 mm. The heads process the welded joint of SA508 - 4 steel. The dedicated power supply for controllable electromagnetic energy (CEME) is set with a duty cycle of 20%, a frequency of 20 Hz, and a peak current of 100 A; a 100 kHz intermediate frequency induction power supply is used to heat the induction heating head.

[0073] The drilling strain method is used to detect the residual stress. Strain rosettes are pasted at the center and edge of the welded joint, and holes are drilled on the strain rosettes to measure the strain released on the surface of the welded joint. The measured strain is substituted into the formula to calculate the residual stress of the part where the material has been removed.

[0074] Electromagnetic energy acts on SA508-4 steel in a magneto-thermal coupling manner, making the vibration of atoms at the welding joint more intense, prompting the atoms to tend to the low-energy state, thereby reducing or eliminating residual stress; the use of electromagnetic energy to remove residual stress can achieve advantages such as non-contact and pollution-free. The welding joint of SA508-4 steel is polished, strain rosettes are pasted at the center and edge of the weld, perpendicular to the welding direction, holes are drilled at the center of the strain rosette to release residual stress, and the electromagnetic energy stress-relieving head is used to process the welding joint of SA508-4 steel; under the combined action of thermal-electromagnetic energy, the maximum reduction in residual stress in the X direction is 69.0%, the average value is 54.3%, and the maximum reduction in residual stress in the Y direction is 47.8%, the average value is 41.6%. Facts have proved that the residual stress at the welded joint processed by electromagnetic energy has been greatly reduced.

[0075] Example 4

[0076] This example further details the process of removing residual stress from the welding of Q690 high-strength steel.

[0077] The material used in the test is Q690 high-strength steel, with a specification of 300mm×80mm×10mm. A U-shaped groove of 300mm×6mm×4mm is milled at the center of the steel plate using a milling machine, and welding is carried out using gas metal arc surfacing. The residual stress is measured by the drilling strain method as Figure 9 , and a control test is carried out on 12 points of the Q690 high-strength steel plate. The dedicated power supply of controllable electromagnetic energy CEME is set to a frequency of 10Hz, a peak current of 25A, a processing time of 30s, the distance between the magnetic head and the steel plate is 5mm, and the magnetic induction intensity reaches 1.3T. In this experiment, only the electromagnetic energy stress-relieving head is used, and the combined action of electromagnetic energy-thermal energy is not adopted.

[0078] Using electromagnetic energy to remove residual stress is a convenient, fast, and simple method for removing residual stress. Under a certain magnetic field intensity, it can promote the migration of atoms inside the Q690 steel plate, so that the atoms move to a more stable low-energy state, achieving the reduction or removal of residual stress. It can be clearly seen from Table 1 that for the Q690 high-strength steel processed by electromagnetic energy, the residual stress has been significantly reduced. When the distance between the magnetic head and the test point position is 5mm, the maximum reduction in the X-axis direction is 69.75%, the average value is 55.21%, the maximum reduction in the Y-axis direction is 57.45%, and the average value is 42.43%. Facts have proved that the steel plate processed by electromagnetic energy has greatly reduced the residual stress, enabling the workpiece to maintain good mechanical properties to the greatest extent.

[0079]

[0080] Table 1. Data sheet of experimental results for Example 4

[0081] The present invention expounds the principle and implementation manner of the present invention by using specific examples. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A device for removing residual stress from the circumferential weld of a large thin-walled cylinder, characterized in that: it includes an electromagnetic energy stress removal device and a pipe matching device. The pipe matching device can be supported on the cylinder weldment. The electromagnetic energy stress removal device can process the weld of the cylinder weldment under the combined action of electromagnetic energy and thermal energy. The electromagnetic energy stress removal device includes an induction heating magnetic head and an electromagnetic energy stress removal magnetic head. The induction heating magnetic head includes an induction heating magnetic head iron core and an induction heating magnetic head coil. The induction heating magnetic head coil is arranged around the induction heating magnetic head iron core. The induction heating magnetic head coil can be connected to an intermediate frequency induction power supply for preheating, and the preheating temperature is 100~300°C; the pipe matching device includes a track and a stepping trolley. The track surrounds the cylinder weldment and is arranged close to the weld. The stepping trolley can perform circular motion on the track. The electromagnetic energy stress removal device is installed on the stepping trolley; a fixing plate is installed on the stepping trolley through a spacing adjustment mechanism. The electromagnetic energy stress removal device is installed on the fixing plate. The spacing adjustment mechanism can adjust the height distance and left-right deviation between the electromagnetic energy stress removal device and the weld. Among them, the spacing adjustment mechanism includes an adjustment block and an adjustment rod. The adjustment block is slidably installed left and right on the stepping trolley. The adjustment rod is slidably installed up and down on the adjustment block. The fixing plate is connected to the adjustment rod. The electromagnetic energy stress removal device is installed on the fixing plate. By moving the adjustment block and the adjustment rod, the fixing plate and the electromagnetic energy stress removal device thereon are driven to move.

2. The device for removing residual stress from the circumferential weld of a large thin-walled cylinder according to claim 1, characterized in that: the track is equipped with a flexible adjustment track tooling, and limit holes can be opened on the track.

3. The device for removing residual stress from the circumferential weld of a large thin-walled cylinder according to claim 1, characterized in that: the electromagnetic energy stress removal magnetic head includes an electromagnetic energy stress removal magnetic head iron core and an electromagnetic energy stress removal magnetic head coil. The electromagnetic energy stress removal magnetic head coil is arranged around the electromagnetic energy stress removal magnetic head iron core.

4. The device for removing residual stress from the circumferential weld of a large thin-walled cylinder according to claim 1, characterized in that: the diameter of the cylinder weldment is 10m and the wall thickness is 10mm.

5. A method for removing residual stress from the circumferential weld of a large thin-walled cylinder, characterized in that, using the device for removing residual stress from the circumferential weld of a large thin-walled cylinder according to any one of claims 1-4, including the following steps: Step 1, welding the cylinder weldment; Step 2, installing the welded cylinder weldment and the pipe matching device, and installing the electromagnetic energy stress removal device; Step 3, relatively rotating the cylinder weldment and the pipe matching device, and processing the weld of the cylinder weldment through the electromagnetic energy stress removal device.

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