Welding device and welding method for TF coil box

Abstract

The invention relates to the field of nuclear fusion devices, and discloses a TF coil box welding device and method, and the device comprises a base which is provided with a first direction and a second direction; the multiple straight section clamping mechanisms are arranged on the base in the first direction, and each straight section clamping mechanism comprises two first clamping parts which are spaced and symmetrical in the second direction; the bent section clamping mechanism is arranged on the base and comprises two second clamping parts which are spaced and symmetrical in the second direction, and the second clamping parts and the first clamping parts can detect displacement and stress in the second direction and can telescopically apply clamping force in the second direction; and the top end clamping mechanism is arranged on the base and is configured to be capable of detecting displacement and stress in the first direction and telescopically applying clamping force in the first direction. Through cooperation of the dynamic adjustable clamping force and the real-time displacement stress monitoring device, the magnitude and the direction of the clamping force can be adjusted in real time, rebound deformation after the tool is dismounted is eliminated, and the consistency and the reliability of the welding quality are improved.

Description

Technical Field

[0001] This invention relates to the field of magnet engineering manufacturing technology for nuclear fusion devices, and in particular to a welding device and welding method for a TF coil box. Background Technology

[0002] The TF coil box in a tokamak device encapsulates and supports the superconducting TF coil. It not only performs the functions of installing and positioning the superconducting coil but also withstands enormous electromagnetic forces and structural loads during device operation. As a core component of the tokamak device, the TF coil box is characterized by its enormous size (over 20 meters high), extremely thick cross-section (wall thickness greater than 100 mm, reaching 200–300 mm in some areas), and complex structure (a "D"-shaped curved surface). Its welding and manufacturing present severe challenges in stress and deformation control. Related technologies typically employ rigid constraint fixtures, i.e., various fixed fixtures, to fix the TF coil box. While this can limit welding deformation, it accumulates enormous constraint stress within the workpiece. After the fixtures are removed, "springback" deformation easily occurs, thus affecting the geometric accuracy and current centerline position of the TF coil box. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a welding device for a TF coil box, which can apply controllable prestress to the TF coil box, thereby reducing residual welding stress, suppressing welding deformation, and improving the geometric accuracy and reliability of the welded structure.

[0004] The present invention also aims to provide a welding method for a TF coil box, using the welding apparatus for the TF coil box described above.

[0005] A welding apparatus for a TF coil box according to an embodiment of the present invention includes: a base having a first direction and a second direction perpendicular to each other; a straight section clamping mechanism, which is disposed on the base and has a plurality of straight section clamping mechanisms along the first direction, the straight section clamping mechanism including two spaced and symmetrically spaced first clamping portions in the second direction; a curved section clamping mechanism, which is disposed on the base and includes two spaced and symmetrically spaced second clamping portions in the second direction, the second clamping portions and the first clamping portions being configured to detect displacement and stress in the second direction, and to apply a clamping force retractably in the second direction; and a top end clamping mechanism, which is disposed on the base and is configured to detect displacement and stress in the first direction, and to apply a clamping force retractably in the first direction.

[0006] The welding device for the TF coil box according to an embodiment of the present invention, through the coordinated operation of the dynamically adjustable clamping force of the straight section clamping mechanism, the curved section clamping mechanism, and the top clamping mechanism, and the real-time displacement stress monitoring device, can adjust the magnitude and direction of the clamping force in real time according to displacement and stress feedback information. This enables active control and adaptive release of stress during the welding process, effectively eliminating springback deformation after tooling removal, thereby improving the geometric accuracy of the TF coil box. At the same time, it can perform precise local stress compensation for the TF coil box, reduce the residual stress level, and improve the consistency and reliability of the welding quality of the TF coil box.

[0007] In some embodiments of the present invention, the first clamping part includes a first force-applying member and a first pressing member. The first force-applying member is disposed on the base and configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. The first pressing member is connected to the first force-applying member and is perpendicular to the first direction and the second direction.

[0008] In some embodiments of the present invention, the second clamping part includes a second force-applying member and a second pressing member. The second force-applying member is disposed on the base and configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. The second pressing member is connected to the second force-applying member and is disposed perpendicular to the second direction and inclined relative to the first direction.

[0009] In some embodiments of the present invention, the top clamping mechanism includes a third force-applying member and a fixing frame. The third force-applying member is disposed on the base and configured to detect displacement and stress in the first direction and to apply clamping force retractably in the first direction. The fixing frame is provided with a limiting hole for fixing the top of the TF coil box, and the fixing frame is parallel to the first direction and the second direction.

[0010] In some embodiments of the present invention, the fixing frame includes a main frame and a side baffle. The main frame is connected to the third force-applying member and has an opening at one end away from the third force-applying member. The side baffle is located on the side of the main frame away from the third force-applying member and is detachably connected to the main frame by bolts.

[0011] In some embodiments of the present invention, the base includes a base plate and side plates, the base plate extends along the first direction, the side plates are provided at both ends of the base plate in the first direction, the side plates are perpendicular to the base plate, the first clamping part and the second clamping part are provided on the base plate, and the top clamping mechanism is provided on the side plates.

[0012] According to an embodiment of the present invention, a welding method for a TF coil box is provided. The TF coil box is welded using a welding apparatus as described above. The TF coil box includes a straight segment and two curved segments, the two curved segments being located at both ends of the straight segment along its length. The welding method includes: fixing the straight segment to a base using two first clamping parts, and fixing the curved segments to the base using two second clamping parts and a top clamping mechanism. During the welding process of the straight segment and the curved segments, the first clamping parts, the second clamping parts, and the top clamping mechanism continuously detect a first displacement and a first stress variable at corresponding positions, and adjust the welding method according to the detected first displacement... Based on the displacement and the first stress variable, the first clamping part, the second clamping part, and the top clamping mechanism adjust their clamping forces in opposite directions to counteract the corresponding first displacement and the first stress variable; during the welding process and cooling to the target temperature range, the first clamping part, the second clamping part, and the top clamping mechanism continue to detect the second displacement and the second stress variable in real time. Based on the detected second displacement and the second stress variable, the first clamping part, the second clamping part, and the top clamping mechanism adjust their clamping forces in opposite directions to counteract the corresponding second displacement and the second stress variable; the first clamping part, the second clamping part, and the top clamping mechanism release the TF coil box.

[0013] According to the welding method of the TF coil box of the present invention, the above method steps enable the dynamic adjustable clamping force and the real-time displacement stress monitoring device to work together to adjust the magnitude and direction of the clamping force in real time according to the displacement and stress feedback information. This achieves active control and adaptive release of stress during the welding process, effectively eliminates springback deformation after tooling removal, thereby improving the geometric accuracy of the TF coil box. At the same time, it can accurately compensate for local stress in the TF coil box, reduce the residual stress level, and improve the consistency and reliability of the welding quality of the TF coil box.

[0014] In some embodiments of the present invention, before the step of the first clamping part, the second clamping part, and the top clamping mechanism releasing the TF coil box, the method further includes: determining that the welding of the TF coil box is completed when the first clamping part, the second clamping part, and the top clamping mechanism do not detect the displacement and the stress within a set time period.

[0015] In some embodiments of the present invention, the steps of fixing the straight segment to the base by the two first clamping parts and fixing the curved segment to the base by the two second clamping parts and the top clamping mechanism further include: setting the corresponding displacement and stress currently detected by the first clamping parts, the second clamping parts and the top clamping mechanism to zero.

[0016] In some embodiments of the present invention, during the process of fixing the straight segment to the base by the two first clamping parts, at least three straight segment clamping mechanisms are provided, and at least the two ends and the middle position of the straight segment are fixed.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 A three-dimensional structural schematic diagram of the welding device for a TF coil box provided in some embodiments of the present invention; Figure 2 for Figure 1 A magnified view of part I; Figure 3 for Figure 1 A magnified view of section II; Figure 4 for Figure 1 A magnified view of section III; Figure 5 The above are schematic diagrams of a welding device for a TF coil box and an assembly of a TF coil box, provided for some embodiments of the present invention. Figure 6 A flowchart illustrating a welding method for a TF coil box provided in some embodiments of the present invention; Figure 7 This is a flowchart illustrating a welding method for a TF coil box provided in other embodiments of the present invention.

[0019] Figure label: 100. Welding equipment for TF coil boxes; 10. Base; 101. Bottom plate; 102. Side plate; 20. Straight section clamping mechanism; 201. First clamping part; 2011. First force-applying component; 2001. First force-applying shaft; 2012. First pressing component; 20121. First plate; 20122. First protrusion; 2012a. First screw hole; 30. Bending segment clamping mechanism; 301. Second clamping part; 3011. Second force-applying component; 3001. Second force-applying shaft; 3012. Second clamping component; 3012a. Second screw hole; 30121. Second plate; 30122. Second protrusion; 40. Top clamping mechanism; 401. Third force-applying component; 4001. Third force-applying shaft; 402. Fixing frame; 402a. Limiting hole; 4021. Main frame; 4021a. Third screw hole; 4022. Side baffle; 200, TF coil box; 210, straight section; 220, curved section. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The welding device 100 for the TF coil box in this embodiment of the invention is used to weld the TF coil box 200 of a nuclear fusion device. The TF coil box 200 is used to cover and support the TF coil. The TF coil box 200 may include a straight segment 210 and two curved segments 220. The two curved segments 220 are located at both ends of the straight segment 210 along its length. Each curved segment 220 is welded to the straight segment 210. The welding device 100 is used to fix the straight segment 210 and the two curved segments 220 to achieve the welding operation between the straight segment 210 and the two curved segments 220.

[0024] The following is for reference. Figures 1-5 The welding apparatus 100 for a TF coil box according to an embodiment of the present invention is described.

[0025] like Figures 1 to 4 As shown, a welding apparatus 100 for a TF coil box according to an embodiment of the present invention includes a base 10, a straight section clamping mechanism 20, a curved section clamping mechanism 30, and a top clamping mechanism 40. The base 10 has a first direction and a second direction perpendicular to each other. Multiple straight section clamping mechanisms 20 are disposed on the base 10 and arranged along the first direction, each including two spaced-apart and symmetrically arranged first clamping portions 201 in the second direction. The curved section clamping mechanism 30 is disposed on the base 10 and includes two spaced-apart and symmetrically arranged second clamping portions 301 in the second direction. The second clamping portions 301 and the first clamping portions 201 are configured to detect displacement and stress in the second direction and to apply a clamping force retractably in the second direction. The top clamping mechanism 40 is disposed on the base 10 and configured to detect displacement and stress in the first direction and to apply a clamping force retractably in the first direction.

[0026] The first direction and the second direction can refer to two perpendicular directions of the base 10. One of the length direction and the width direction of the base 10 can be the first direction, and the other can be the width direction. For example, refer to... Figure 1 The length direction of the base 10 is the left-right direction in the figure, which is the first direction, and the width direction is the front-back direction, which is the second direction.

[0027] The number of straight segment clamping mechanisms 20 can be, but is not limited to, two, three, four, etc., and multiple straight segment clamping mechanisms 20 are spaced apart in the first direction. Each straight segment clamping mechanism 20 may include two spaced apart and symmetrically arranged first clamping parts 201, and the two first clamping parts 201 together form a clamping space for clamping and fixing the straight segment 210.

[0028] The bending segment clamping mechanism 30 is used to clamp the bending segment 220 and is matched according to the number of bending segments 220. For example, the TF coil box 200 includes two bending segments 220, and correspondingly, the welding device 100 of the TF coil box may include two bending segment clamping mechanisms 30. Each bending segment clamping mechanism 30 may include two spaced and symmetrical second clamping parts 301, which together form a clamping space for clamping and fixing the corresponding bending segment 220. The bending segment clamping mechanisms 30 are disposed on both sides of the plurality of straight segment clamping mechanisms 20 in a first direction. Optionally, there may be one or more bending segment clamping mechanisms 30 on either side of the plurality of straight segment clamping mechanisms 20 in the first direction.

[0029] The second clamping part 301 and the first clamping part 201 are configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. For example, the configuration and operation of the second clamping part 301 and the first clamping part 201 can refer to the stress displacement tensile machine or tensile testing machine in the related art, which has displacement and stress detection functions and can realize thrust or tension control.

[0030] The top clamping mechanism 40 is used to clamp the top end of the fixed curved section 220. The number of top clamping mechanisms 40 is matched to the number of curved sections 220. Referring to the previous text, the TF coil box 200 includes two curved sections 220, and the number of top clamping mechanisms 40 can be two. The top clamping mechanism 40 is constructed to detect displacement and stress in the first direction, and to apply clamping force in the first direction in a telescopic manner. The structure and operation of the top clamping mechanism 40 can also refer to stress displacement tensile testing machines or tensile testing machines in related technologies, which have displacement and stress detection functions and can realize thrust or tension control. The top clamping mechanism 40 is located on the side of the curved section clamping mechanism 30 away from the straight section clamping mechanism 20, and the top clamping mechanism 40 is also spaced apart from the curved section clamping mechanism 30 in a third direction. The third direction, the second direction, and the first direction are perpendicular to each other. For example, refer to... Figure 1 The third direction is up and down, and the top clamping mechanism 40 is located on the upper side of the bending clamping mechanism 30.

[0031] The welding device 100 for the TF coil box can clamp the straight section 210 on both sides through the two first clamping parts 201 of the multiple straight section clamping mechanisms 20, fixing the straight section 210 to the base 10. It can also clamp the two sides and the top of the curved section 220 through the two second clamping parts 301 of the curved section clamping mechanism 30 and the top clamping mechanism 40, fixing the curved section 220 to the base 10. During the clamping and fixing, since the clamping force of the first clamping parts 201, the second clamping parts 301 and the top clamping mechanism 40 is adjustable, prestress can be applied to the straight section 210 and the curved section 220.

[0032] During the welding process of the TF coil box 200, welding deformation is prone to occur at the welding positions of the straight section 210 and the bent section 220. For example, the bent sections 220 at both ends are prone to relative bending in the second direction relative to the straight section 210, and the top of the bent section 220 tends to shift towards the center of the straight section 210. Especially after the TF coil box 200 is welded, under the stress caused by the welding deformation, the TF coil box 200 as a whole rebounds, and the deformation trend is more obvious, causing changes in the geometric accuracy and current centerline position of the TF coil box 200. In the welding apparatus 100 for the TF coil box of this embodiment of the invention, since the straight section clamping mechanism 20, the curved section clamping mechanism 30 and the top clamping mechanism 40 can all detect the displacement and stress changes at the corresponding positions, after detecting the displacement and stress changes, the two first clamping parts 201 of each straight section clamping mechanism 20, the two second clamping parts 301 of each curved section clamping mechanism 30 and the top clamping mechanism 40 can apply stress in opposite directions to control deformation, thereby offsetting the deformation at the corresponding positions, so that the straight section 210 and the curved section 220 can always be maintained in the initial state for welding. This can avoid the deformation caused by springback after the TF coil box 200 is welded.

[0033] According to an embodiment of the present invention, the welding device 100 for the TF coil box, through the coordinated operation of the straight section clamping mechanism 20, the curved section clamping mechanism 30, and the top clamping mechanism 40, can dynamically adjust the clamping force and the real-time displacement stress monitoring device. It can adjust the magnitude and direction of the clamping force in real time according to the displacement and stress feedback information, thereby realizing the active control and adaptive release of stress during the welding process, effectively eliminating the springback deformation after tooling removal, thereby improving the geometric accuracy of the TF coil box 200. At the same time, it can perform precise local stress compensation for the TF coil box 200, reduce the residual stress level, and improve the consistency and reliability of the welding quality of the TF coil box 200.

[0034] In some embodiments of the present invention, such as Figure 2 As shown, the first clamping part 201 includes a first force-applying member 2011 and a first clamping member 2012. The first force-applying member 2011 is provided on the base 10 and is configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. The first clamping member 2012 is connected to the first force-applying member 2011 and is perpendicular to the first and second directions.

[0035] The first force-applying component 2011 is a device capable of detecting displacement and stress in the second direction, and of applying clamping force in the second direction in a telescopic manner, such as a stress-displacement tensile testing machine or a tensile testing machine. The first clamping component 2012 is a pressure plate or a pressure block, etc. The side of the first clamping component 2012 near the straight segment 210 can be constructed as a contoured surface. The first clamping component 2012 is perpendicular to the first and second directions, which facilitates adaptation to the linear structure of the straight segment 210.

[0036] In some embodiments of the present invention, such as Figure 2 As shown, the first clamping member 2012 may include a first plate 20121 and two first protrusions 20122. The first plate 20121 is connected to the first force-applying member 2011 and is perpendicular to the first and second directions. The two first protrusions 20122 are located on the side of the first plate 20121 away from the first force-applying member 2011. Optionally, the protrusion heights of the two first protrusions 20122 relative to the first plate 20121 may be equal or unequal. Using this scheme, the two first protrusions 20122 can adapt to the outer surface of the straight segment 210, ensuring that the first clamping member 2012 can be tightly pressed onto the straight segment 210, and also reducing material usage and lowering costs.

[0037] In some embodiments of the present invention, such as Figure 2 As shown, the first force-applying component 2011 has a retractable first force-applying shaft 2001, and the first clamping component 2012 is provided with a first screw hole 2012a, which is screwed to the first force-applying shaft 2001. Using the above scheme, the first clamping component 2012 and the first force-applying component 2011 can be detachably connected, allowing for the replacement of damaged parts and reducing maintenance and usage costs.

[0038] In some embodiments of the present invention, such as Figure 3 As shown, the second clamping part 301 includes a second force-applying member 3011 and a second clamping member 3012. The second force-applying member 3011 is provided on the base 10 and is configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. The second clamping member 3012 is connected to the second force-applying member 3011 and is arranged perpendicular to the second direction and inclined relative to the first direction.

[0039] The second force-applying member 3011 is a device capable of detecting displacement and stress in the second direction and applying clamping force in the second direction in a telescopic manner, such as a stress-displacement tensile tester or a tensile testing machine. The second clamping member 3012 is a pressure plate or pressure block, etc. The side of the second clamping member 3012 near the bending section 220 can be constructed as a contoured surface. The second clamping member 3012 is arranged perpendicular to the first direction and inclined relative to the first direction, which facilitates adaptation to the bending structure of the bending section 220.

[0040] In some embodiments of the present invention, such as Figure 3As shown, the second clamping member 3012 may include a second plate 30121 and two second protrusions 30122. The second plate 30121 is connected to the second force-applying member 3011 and is perpendicular to and inclined relative to the first direction. The two second protrusions 30122 are located on the side of the second plate 30121 away from the second force-applying member 3011. Optionally, the protrusion heights of the two second protrusions 30122 relative to the second plate 30121 may be equal or unequal. Using this scheme, the two second protrusions 30122 can adapt to the outer surface of the bent section 220 to ensure that the second clamping member 3012 can be tightly pressed onto the bent section 220, and it also reduces material usage and lowers costs.

[0041] In some embodiments of the present invention, such as Figure 3 As shown, the second force-applying member 3011 has a retractable second force-applying shaft 3001, and the second clamping member 3012 is provided with a second screw hole 3012a, which is screwed to the second force-applying shaft 3001. Using this scheme, the second clamping member 3012 and the second force-applying member 3011 can be detachably connected, allowing for the replacement of damaged parts and reducing maintenance and usage costs.

[0042] In some embodiments of the present invention, such as Figure 4 As shown, the top clamping mechanism 40 includes a third force-applying member 401 and a fixing frame 402. The third force-applying member 401 is provided on the base 10 and is configured to detect displacement and stress in the first direction and to apply clamping force in the first direction in a telescopic manner. The fixing frame 402 is provided with a limiting hole 402a for fixing the top of the TF coil box 200. The fixing frame 402 is parallel to the first direction and the second direction.

[0043] The third force-applying component 401 is a device capable of detecting displacement and stress in the first direction and applying clamping force in the first direction, such as a stress-displacement tensile tester or a tensile testing machine. The fixing frame 402 is a limiting plate or limiting frame, etc., and the limiting hole 402a can cooperate with the top end of the bending section 220, thereby fixing the top end of the bending section 220.

[0044] In some embodiments of the present invention, such as Figure 4As shown, the fixing frame 402 includes a main frame 4021 and a side baffle 4022. The main frame 4021 is connected to the third force-applying member 401, and an opening is formed at the end away from the third force-applying member 401. The side baffle 4022 is located on the side of the main frame 4021 away from the third force-applying member 401 and is detachably connected to the main frame 4021 by bolts. In the above technical solution, the main frame 4021 and the side baffle 4022 constitute a frame structure that can be fitted onto the top of the bent section 220 to fix the top position of the bent section 220. The side baffle 4022 and the main frame 4021 are detachably connected by bolts, which facilitates a secure fit onto the top of the bent section 220 and improves the reliability of the limiting mechanism.

[0045] In some embodiments of the present invention, such as Figure 4 As shown, the third force-applying component 401 has a retractable third force-applying shaft 4001, and the main frame 4021 is provided with a third screw hole 4021a, which is screwed to the third force-applying shaft 4001. (Reference) Figure 4 The main frame 4021 is U-shaped, and the plate section opposite the side baffle 4022 is provided with a third screw hole 4021a. With the above solution, the main frame 4021 and the third force-applying shaft 4001 can be detachably connected, allowing for the replacement of damaged parts and helping to reduce maintenance and usage costs.

[0046] In some embodiments of the present invention, such as Figure 1 As shown, the base 10 includes a base plate 101 and a side plate 102. The base plate 101 extends along a first direction, and the base plate 101 is provided with side plates 102 at both ends in the first direction. The side plates 102 are perpendicular to the base plate 101. A first clamping part 201 and a second clamping part 301 are provided on the base plate 101, and a top clamping mechanism 40 is provided on the side plate 102.

[0047] The base plate 101 and side plates 102 can be, but are not limited to, frame plate structures or solid plate structures. For example, see reference... Figure 1 Both the base plate 101 and the side plate 102 are frame structures.

[0048] In the above technical solution, the base 10 is configured to include a bottom plate 101 and a side plate 102. The side plate 102 is relatively high, and after the top clamping mechanism 40 is installed, it can adapt to the height position of the bending section 220, which facilitates the fixing of the bending section 220.

[0049] According to an embodiment of the present invention, a welding method for a TF coil box 200 is provided, wherein a welding device 100 for a TF coil box as described in any of the preceding embodiments is used to weld the TF coil box 200. The TF coil box 200 includes a straight segment 210 and two curved segments 220, which are located at both ends of the straight segment 210 along its length.

[0050] like Figure 6 As shown, the welding method of the TF coil box 200 in this embodiment of the invention includes: Step S1: The straight segment 210 is fixed to the base 10 by the two first clamping parts 201, and the curved segment 220 is fixed to the base 10 by the two second clamping parts 301 and the top clamping mechanism 40. It should be noted that before welding, the straight segment clamping mechanism 20, the curved segment clamping mechanism 30 and the top clamping mechanism 40 need to pull the straight segment 210 and the curved segment 220 outward to leave an installation gap between the straight segment 210 and the curved segment 220.

[0051] Step S2: During the welding process of the straight section 210 and the curved section 220, the first clamping part 201, the second clamping part 301 and the top clamping mechanism 40 detect the first displacement and the first stress variable at the corresponding positions in real time. Based on the detected first displacement and the first stress variable, the first clamping part 201, the second clamping part 301 and the top clamping mechanism 40 adjust the clamping force in the opposite direction to counteract the corresponding first displacement and the first stress variable.

[0052] Step S3: During the welding process and cooling to the target temperature range, the first clamping part 201, the second clamping part 301 and the top clamping mechanism 40 continue to detect the second displacement and the second stress variable in real time. Based on the detected second displacement and the second stress variable, the first clamping part 201, the second clamping part 301 and the top clamping mechanism 40 adjust the clamping force in the opposite direction to counteract the corresponding second displacement and the second stress variable.

[0053] Step S4: The first clamping part 201, the second clamping part 301, and the top clamping mechanism 40 release the TF coil box 200.

[0054] According to the welding method of the TF coil box 200 of the present invention, the above-described method steps enable the dynamic adjustable clamping force and the real-time displacement stress monitoring device to work together to adjust the magnitude and direction of the clamping force in real time based on displacement and stress feedback information. This achieves active control and adaptive release of stress during the welding process, effectively eliminating springback deformation after tooling removal, thereby improving the geometric accuracy of the TF coil box 200. At the same time, it can accurately compensate for local stress in the TF coil box 200, reduce the residual stress level, and improve the consistency and reliability of the welding quality of the TF coil box 200.

[0055] like Figure 7 As shown, in some embodiments of the present invention, before the step of the first clamping part 201, the second clamping part 301, and the top clamping mechanism 40 releasing the TF coil box 200, the method further includes: If no displacement or stress is detected in the first clamping part 201, the second clamping part 301, and the top clamping mechanism 40 within a set time period, the welding of the TF coil box 200 is determined to be complete.

[0056] In the above technical solution, by determining that the welding of the TF coil box 200 is completed when the first clamping part 201, the second clamping part 301 and the top clamping mechanism 40 do not detect displacement and stress within a set time period, it can be determined that the TF coil box 200 has been completely cooled and there is no springback. This can further eliminate the risk of welding deformation of the TF coil box 200 and improve the structural reliability of the TF coil box 200.

[0057] In some embodiments of the present invention, the steps of fixing the straight segment 210 to the base 10 by means of two first clamping parts 201 and fixing the curved segment 220 to the base 10 by means of two second clamping parts 301 and the top clamping mechanism 40 further include: setting the corresponding displacement and stress currently detected by the first clamping parts 201, the second clamping parts 301 and the top clamping mechanism 40 to zero.

[0058] In the above technical solution, the step of zeroing the corresponding displacement and stress detected by the first clamping part 201, the second clamping part 301, and the top clamping mechanism 40 can realize the calibration of the displacement and stress detection of the first clamping part 201, the second clamping part 301, and the top clamping mechanism 40. This facilitates the subsequent accurate measurement of displacement and stress changes, and makes it easy to clearly obtain the data displacement and stress changes, thereby improving the adjustment accuracy and precision of the first clamping part 201, the second clamping part 301, and the top clamping mechanism 40.

[0059] In some embodiments of the present invention, before the step of zeroing the corresponding displacement and stress currently detected by the first clamping part 201, the second clamping part 301 and the top clamping mechanism 40, the steps of fixing the straight segment 210 to the base 10 by the two first clamping parts 201 and fixing the curved segment 220 to the base 10 by the two second clamping parts 301 and the top clamping mechanism 40 further include: applying installation prestress to the straight segment 210 inward by the straight segment clamping mechanism 20 and applying installation prestress to the curved segment 220 inward by the curved segment clamping mechanism 30 and the top clamping mechanism 40, adjusting the positions of the straight segment 210 and the curved segment 220 until they are adjusted to the target welding position.

[0060] It is understandable that the above steps can fine-tune the relative position between the straight segment 210 and the curved segment 220, ensuring the reliability of the welding position and thus improving the welding accuracy.

[0061] In some embodiments of the present invention, such as Figure 1 and Figure 5 As shown, during the process of fixing the straight segment 210 to the base 10 via the two first clamping parts 201, at least three straight segment clamping mechanisms 20 are provided, and at least the two ends and the middle position of the straight segment 210 are fixed. It can be understood that since the two ends of the straight segment 210 are welded to the curved segment 220, the risk of deformation at this position is higher and the amount of deformation is also greater. By providing straight segment clamping mechanisms 20 at this position, welding deformation can be better suppressed. At the same time, the straight segment clamping mechanism 20 at the middle position can suppress deformation at the middle position of the straight segment 210, which can improve the overall structural reliability of the TF coil box 200.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A welding device for a TF coil box, characterized in that, include: The base has a first direction and a second direction that are perpendicular to each other; A straight clamping mechanism is provided on the base and multiple straight clamping mechanisms are provided along the first direction. The straight clamping mechanism includes two first clamping parts that are spaced apart and symmetrical in the second direction. A bending segment clamping mechanism is disposed on the base and includes two second clamping portions spaced apart and symmetrical in the second direction. The second clamping portions and the first clamping portions are configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. A top clamping mechanism is disposed on the base and configured to detect displacement and stress in the first direction and to apply clamping force retractably in the first direction.

2. The welding apparatus for the TF coil box according to claim 1, characterized in that, The first clamping part includes a first force-applying member and a first clamping member. The first force-applying member is disposed on the base and configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. The first clamping member is connected to the first force-applying member and is perpendicular to the first direction and the second direction.

3. The welding apparatus for the TF coil box according to claim 1 or 2, characterized in that, The second clamping part includes a second force-applying member and a second clamping member. The second force-applying member is disposed on the base and configured to detect displacement and stress in the second direction and to apply clamping force in the second direction in a telescopic manner. The second clamping member is connected to the second force-applying member and is disposed perpendicular to the second direction and inclined relative to the first direction.

4. The welding apparatus for the TF coil box according to claim 1, characterized in that, The top clamping mechanism includes a third force-applying component and a fixing frame. The third force-applying component is disposed on the base and configured to detect displacement and stress in the first direction and to apply clamping force in the first direction in a telescopic manner. The fixing frame is provided with a limiting hole for fixing the top of the TF coil box. The fixing frame is parallel to the first direction and the second direction.

5. The welding apparatus for the TF coil box according to claim 4, characterized in that, The fixing frame includes a main frame and a side baffle. The main frame is connected to the third force-applying component and has an opening at one end away from the third force-applying component. The side baffle is located on the side of the main frame away from the third force-applying component and is detachably connected to the main frame by bolts.

6. The welding apparatus for the TF coil box according to claim 1, characterized in that, The base includes a bottom plate and side plates. The bottom plate extends along the first direction. The side plates are provided at both ends of the bottom plate in the first direction. The side plates are perpendicular to the bottom plate. The first clamping part and the second clamping part are provided on the bottom plate. The top clamping mechanism is provided on the side plates.

7. A welding method for a TF coil box, characterized in that, The TF coil box is welded using the welding apparatus for the TF coil box as described in any one of claims 1 to 6, the TF coil box comprising a straight segment and two curved segments, the two curved segments being located at both ends of the straight segment along its length, the welding method comprising: The straight segment is fixed to the base by the two first clamping parts, and the curved segment is fixed to the base by the two second clamping parts and the top clamping mechanism; During the welding process of the straight segment and the curved segment, the first clamping part, the second clamping part and the top clamping mechanism detect the first displacement and the first stress variable at the corresponding position in real time. Based on the detected first displacement and the first stress variable, the first clamping part, the second clamping part and the top clamping mechanism adjust the clamping force in the opposite direction to counteract the corresponding first displacement and the first stress variable. During the welding process and cooling to the target temperature range, the first clamping part, the second clamping part, and the top clamping mechanism continue to detect the second displacement and the second stress variable in real time. Based on the detected second displacement and the second stress variable, the first clamping part, the second clamping part, and the top clamping mechanism adjust the clamping force in the opposite direction to counteract the corresponding second displacement and the second stress variable. The first clamping part, the second clamping part, and the top clamping mechanism release the TF coil box.

8. The welding method for the TF coil box according to claim 7, characterized in that, Before the first clamping part, the second clamping part, and the top clamping mechanism release the TF coil box, the method further includes: If the first clamping part, the second clamping part, and the top clamping mechanism do not detect the displacement and the stress within a set time period, the welding of the TF coil box is determined to be complete.

9. The welding method for the TF coil box according to claim 7, characterized in that, The steps of fixing the straight segment to the base using the two first clamping parts and fixing the curved segment to the base using the two second clamping parts and the top clamping mechanism further include: The corresponding displacements and stresses currently detected by the first clamping part, the second clamping part, and the top clamping mechanism are reset to zero.

10. The welding method for the TF coil box according to any one of claims 7 to 9, characterized in that, During the process of fixing the straight segment to the base through the two first clamping parts, at least three straight segment clamping mechanisms are provided, and at least the two ends and the middle position of the straight segment are fixed.

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