Welding method for C-shaped butt joint piece of fusion reactor coil box

Abstract

The invention discloses a fusion reactor coil box C-shaped butt joint piece welding method, and belongs to the field of welding. The method comprises the following steps that a welding tool is provided, and the welding tool comprises a positioning base, a supporting plate, a pressing plate and a pressure limiting device; wherein the positioning seat provides a limiting surface, a side plate on one side of a to-be-welded C-shaped part is mounted on the limiting surface, the supporting plate is used for supporting and limiting the side plate on the other side in the vertical direction, and the pressing plate is used for pressing the to-be-welded C-shaped part on the positioning seat from top to bottom; the to-be-welded C-shaped part is welded, the horizontal limiting force applied by the pressure limiting device is adjusted according to the relative position change of the C-shaped part far away from the weld joint end, and compensation for welding deformation is achieved; and after the welding seam is cooled, the C-shaped butt joint piece is taken down, and welding is completed. By means of the method, welding deformation of the C-shaped butt joint piece can be effectively reduced, the welding efficiency is improved, and the welding quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of welding, specifically relating to a welding method for C-shaped joints of fusion reactor coil boxes. Background Technology

[0002] The fusion reactor coil box is a critical structural component of the fusion reactor, used to withstand the electromagnetic forces experienced by the coils during operation and to house the cryogenic coolant used to maintain superconductivity. The manufacturing process of the coil box involves welding C-shaped butt joints. The weld thickness of such joints exceeds 350 mm, and the resulting weld is not closed, making it prone to sidewall deformation or overall bending deformation during welding, severely affecting the welding quality of the coil box. Therefore, providing a welding method for the C-shaped butt joints of the fusion reactor coil box that can reduce welding deformation is of positive significance for reducing welding rework, optimizing welding quality, and improving welding efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a welding method for C-shaped joints of fusion reactor coil boxes, thereby reducing welding deformation.

[0004] According to an embodiment of the present invention, a welding method for C-shaped docking parts of a fusion reactor coil box is provided, for welding a first C-shaped part and a second C-shaped part, wherein the first C-shaped part and the second C-shaped part respectively include a base plate and two side plates, and the base plate of the first C-shaped part and the two side plates are respectively docked.

[0005] The method includes the following steps:

[0006] Step a): Provide a welding fixture, and fix the first C-shaped part and the second C-shaped part on the welding fixture so that the ends of the first C-shaped part and the second C-shaped part are connected to each other;

[0007] The welding fixture includes a positioning seat, a support plate, a pressure plate, and a pressure limiting device; wherein the positioning seat provides a limiting surface that matches the side plate on one side of the first C-shaped member and the second C-shaped member; a plurality of support plates are vertically arranged on the positioning seat, and when the first C-shaped member and the second C-shaped member are installed on the limiting surface, the support plates provide vertical support to the side plate on the second side of the first C-shaped member and the second C-shaped member from the end away from the base plate; the pressure plate presses the first C-shaped member and the second C-shaped member onto the positioning seat from top to bottom; the plurality of pressure limiting devices abut against the base plate in the horizontal direction and provide a variable limiting force in the horizontal direction;

[0008] Step b): Weld the butt joint between the first C-shaped part and the second C-shaped part. During the welding process, measure the relative position change of the ends of the first C-shaped part and the second C-shaped part away from the weld seam, and adjust the limiting force applied by the pressure limiting device according to the relative position change to compensate for the welding deformation.

[0009] Step c): After the weld has cooled, remove the C-shaped butt joint from the welding fixture to complete the welding.

[0010] This method can continuously and adaptively correct welding deformation during the welding process, effectively improving post-weld dimensional accuracy. Furthermore, the method is simple to operate, the tooling is easy to disassemble, effectively reducing rework and improving welding efficiency.

[0011] Furthermore, in some embodiments, in step a), before installing the first C-shaped piece and the second C-shaped piece on the welding fixture, the butt joint ends are first beveled so that the butt joint gap of the base plate gradually increases from the 1 / 2 thickness position of the base plate to both sides of the base plate.

[0012] Furthermore, in some embodiments, in step a), at least four support plates are provided, and the side plates on the second side of the first C-shaped member and the second C-shaped member are each supported by at least two support plates.

[0013] Furthermore, in some embodiments, in step a), on one side of the base plate, the pressure plate is fixedly connected to the positioning seat by connecting bolts; on the side away from the base plate, the pressure plate is fixedly connected to the support plate.

[0014] Furthermore, in some embodiments, in step a), when the first C-shaped member and the second C-shaped member are installed on the limiting surface, the plane on which the base plate is located is a vertical plane.

[0015] Furthermore, in some embodiments, in step a), at least four pressure limiting devices are provided, and the first C-shaped member and the second C-shaped member are each provided with limiting force by at least two of the pressure limiting devices.

[0016] Furthermore, in some embodiments, in step a), the pressure limiting device is configured as a hydraulic rod, a pneumatic rod, an electromagnetic rod, or a threaded rod.

[0017] Furthermore, in some embodiments, in step b), during each welding process, the base plate is welded first, followed by the side plate on the first side, and finally the side plate on the second side.

[0018] Furthermore, in some embodiments, in step b), a dial indicator is used to measure the relative positional change of the ends of the first C-shaped member and the second C-shaped member away from the weld. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the welding fixture in one embodiment;

[0020] Figure 2 This is a top view schematic diagram of the welding fixture in one embodiment;

[0021] Figure 3 This is a schematic diagram of the C-shaped component docking structure in one embodiment;

[0022] Figure 4 This is a schematic diagram of the weld cross-section structure of the C-shaped component in one embodiment;

[0023] Figure 5 for Figure 4 Schematic diagram of the bevel structure of the bottom plate at the LL section;

[0024] Figure 6 for Figure 4 Schematic diagram of the bevel structure of the side plate at the DD section.

[0025] Meaning of the reference numerals in the attached figures:

[0026] 1-First C-shaped part; 11-Base plate; 12-Side plate; 13-Side plate; 2-Second C-shaped part; 21-Base plate; 22-Side plate; 23-Side plate; 3-Welding fixture; 31-Positioning seat; 32-Support plate; 33-Pressure plate; 34-Pressure limiting device; 35-Long bolt; 36-Short bolt.

[0027] The purpose of the above-described drawings is to provide a detailed description of the present invention so that those skilled in the art can understand the technical concept of the invention, and is not intended to limit the invention. For the sake of brevity, the above-described drawings only schematically depict the structures related to the technical features of the present invention, and do not depict the complete structure and all details strictly according to actual scale. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0029] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment herein. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive, independent, or alternative embodiments. Those skilled in the art will understand that the embodiments herein can be combined with other embodiments without causing structural conflicts.

[0030] In this description, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," "joining," etc., should be interpreted broadly, for example, referring to movable connections, fixed connections, or integration. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0031] In this description, terms such as "upper," "lower," "left," "right," "lateral," "longitudinal," "height," "length," and "width," which indicate orientation or positional relationships, are intended to accurately describe the embodiments and simplify the description, rather than limiting the parts or structures involved to have a specific orientation, or to be installed or operated in a specific orientation, and should not be construed as limiting the embodiments in this document.

[0032] In this description, terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating relative importance or limiting the number, specific order, or primary / secondary relationship of the described technical features. In this description, "multiple" means at least two.

[0033] The coil housing is a crucial structural component of a fusion reactor. It must withstand the Lorentz forces experienced by the coils during reactor operation and also house the cryogenic cooling medium that maintains the coils' superconductivity. Therefore, the coil housing requires extremely high structural precision. The manufacturing process of the coil housing necessitates... Figure 3 The first C-shaped component 1 and the second C-shaped component 2 shown are welded together. The first C-shaped component 1 includes a base plate 11 and side plates 12 and 13 connected to the two sides of the base plate 11. The second C-shaped component 2 includes a base plate 21 and side plates 22 and 23 connected to the two sides of the base plate 21. During the welding connection, the base plate 11 and base plate 21, the side plates 12 and 22, and the side plates 13 and 23 are respectively butted together. Figure 4 Because the thickness h of the base plate 11 and base plate 12 is relatively large (up to 375mm), and the weld cross section is an irregular C-shaped structure, the thermal deformation introduced during the welding process can easily lead to severe overall deformation of the welded parts. Specifically, dimensional deviations are likely to occur along the directions indicated by arrows a, b, c, and d, requiring a large amount of rework and repair, which seriously affects the efficiency of welding operations and the quality of the welded products.

[0034] To address the above problems, embodiments of the present invention provide a welding method for C-shaped mating parts of a fusion reactor coil box, the method comprising the following steps:

[0035] Step a): Provide, for example Figure 1 , Figure 2The welding fixture 3 shown is a positioning seat 31, and a support plate 32, a pressure plate 33, and a pressure limiting device 34 fixedly mounted on the positioning seat 31. The upper surface of the positioning seat 31 provides a limiting surface, the shape of which matches the side plates 12 and 22. When the first C-shaped part 1 and the second C-shaped part 2 are fixedly mounted on the positioning seat 31 via the side plates 12 and 22 respectively, the mating ends of the first C-shaped part 1 and the second C-shaped part 2 (i.e., the ends to be welded) are positioned as follows: Figure 3 The connection is made in the manner shown. In a preferred embodiment, when fixedly installed on the positioning seat 31, the base plate 11 and the base plate 21 are in a vertical plane. The positioning seat 31 is made of carbon steel and has high rigidity.

[0036] In a further preferred embodiment, before installing the first C-shaped part 1 and the second C-shaped part 2 onto the welding fixture 3, the ends to be welded are first beveled: [The text abruptly ends here, likely due to an incomplete sentence or missing information.] Figure 4 and Figure 5 After beveling, the gap between the bottom plate 11 and the bottom plate 21 gradually widens from the 1 / 2 thickness point towards both sides; the beveling process for the side plates is taken as an example of side plate 13 and side plate 23, combined with... Figure 4 and Figure 6 After beveling, the gap between side plate 13 and side plate 23 gradually widens from half the thickness towards both sides. Beveling makes it easier to control dimensional accuracy during welding and reduces welding deformation.

[0037] Multiple support plates 32 provide vertical support to the side plates 13 and 23 from the open end of the C-shaped member, i.e., the end away from the base plate 11 and base plate 21. In a preferred embodiment, four support plates 32 are provided, respectively located on the side of the first C-shaped member 1 and the second C-shaped member 2 near the mating end and the side away from the mating end, to provide effective support and limiting for the side plates 13 and 23. The support plates 32 can be configured as fixed structures, conforming to the contact position with the side plates 13 and 23, or they can be configured as height-adjustable to adapt to different sizes of parts to be welded.

[0038] The pressure plate 33 presses the first C-shaped piece 1 and the second C-shaped piece 2 onto the positioning seat 31 from top to bottom. Specifically, the side of the pressure plate 33 closest to the base plate 11 and the base plate 21 is fixedly connected to the positioning seat 31 by a long bolt 35, and the vertical positioning of the first C-shaped piece 1 and the second C-shaped piece 2 is adjusted by rotating the long bolt 35; the side of the pressure plate 33 closest to the opening of the C-shaped piece, that is, the side closest to the support plate 32, is fixedly connected to the top of the support plate 32 by a short bolt 36. The lower surface of the pressure plate 33 conforms to the side plates 13 and 23 to better apply vertical positioning.

[0039] The positioning seat 31 is also provided with multiple pressure limiting devices 34, which abut against the base plate 11 and base plate 21 in the horizontal direction, and can apply an adjustable limiting force in the horizontal direction. In different embodiments, depending on the structural design of the welding fixture 3, the pressure limiting device 34 can be set as a hydraulic rod, a pneumatic rod, or an electromagnetic rod, or it can be set as a mechanical threaded rod. In a preferred embodiment, the pressure limiting device 34 is set as a threaded rod, and the pressure applied to the base plate 11 / base plate 21 by rotating the threaded rod is adjusted; two pressure limiting devices 34 are set at both ends of the first C-shaped member 1, and two pressure limiting devices are set at both ends of the second C-shaped member 2, so as to effectively apply horizontal limiting during the welding process. In some embodiments, such as Figure 3 As shown, the base plate 21 is not a single plane, but rather has a certain curvature or multiple planes that are at angles to each other. In such a case, as... Figure 2 As shown, the pressure limiting device 34 abuts against the base plate 21 along the normal direction to apply the limiting force more effectively.

[0040] Step b): Weld the joint between the first C-shaped part 1 and the second C-shaped part 2. In the preferred embodiment, the root pass weld, fill pass weld, and cover pass weld are performed sequentially according to the order of base plate 11 and base plate 21, side plate 12 and side plate 22, and side plate 13 and side plate 23, respectively. During the welding process, the relative position change of the ends of the first C-shaped part 1 and the second C-shaped part 2 away from the weld is measured, and the pressure of each pressure limiting device 34 on the base plate 11 and / or base plate 21 is adjusted according to the relative position change during the welding process, so as to control the pressure of the base plate 11 and / or base plate 21. Figure 3 The welding deformation in the directions indicated by arrows a and b is compensated. Preferably, during the welding process, the long bolt 35 and short bolt 36 can also be adjusted to adjust the pressure applied by the pressure plate 33 to the side plate 13 and / or side plate 23, so as to compensate for the welding deformation. Figure 3 The welding deformation in the directions indicated by arrows c and d is compensated. In different embodiments, the compensation for welding deformation can be performed continuously during the welding process or after each welding pass.

[0041] Step c): After all welds are completed, wait for the welds to cool, remove the pressure applied by the pressure limiting device 34, remove the long bolts 35 and short bolts 36 and remove the pressure plate 33, and remove the welded C-shaped butt joint to complete the welding.

[0042] The welding method for fusion reactor coils and C-shaped mating parts provided in the above embodiments can effectively compensate for welding deformation during the welding process, reduce the post-weld deformation of the coil box C-shaped mating parts, effectively improve dimensional accuracy, reduce the amount of rework after welding, and improve the quality and efficiency of welding operations. The welding fixtures used in this method have a simple structure, are easy to install, adjust and disassemble, have low operation difficulty, and low manufacturing cost.

[0043] The purpose of the above embodiments is to provide a more detailed description of the present invention in conjunction with the accompanying drawings, so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the present invention, optimization or equivalent substitution of the technical features involved, as well as combination of empirical methods in different embodiments without causing structural and principle conflicts, all fall within the protection scope of the present invention.

Claims

1. A method for welding C-shaped mating parts of a fusion reactor coil box, used for welding a first C-shaped part and a second C-shaped part, wherein the first C-shaped part and the second C-shaped part respectively include a base plate and two side plates, and the base plate of the first C-shaped part and the two side plates of the second C-shaped part are respectively mated; characterized in that, Includes the following steps: Step a): Provide a welding fixture, and fix the first C-shaped part and the second C-shaped part on the welding fixture so that the ends of the first C-shaped part and the second C-shaped part are connected to each other; The welding fixture includes a positioning seat, a support plate, a pressure plate, and a pressure limiting device; wherein the positioning seat provides a limiting surface that matches the side plate on one side of the first C-shaped member and the second C-shaped member; a plurality of support plates are vertically arranged on the positioning seat, and when the first C-shaped member and the second C-shaped member are installed on the limiting surface, the support plates provide vertical support to the side plate on the second side of the first C-shaped member and the second C-shaped member from the end away from the base plate; the pressure plate presses the first C-shaped member and the second C-shaped member onto the positioning seat from top to bottom; the plurality of pressure limiting devices abut against the base plate in the horizontal direction and provide a variable limiting force in the horizontal direction; Step b): Weld the butt joint between the first C-shaped part and the second C-shaped part. During the welding process, measure the relative position change of the ends of the first C-shaped part and the second C-shaped part away from the weld seam, and adjust the limiting force applied by the pressure limiting device according to the relative position change to compensate for the welding deformation. Step c): After the weld has cooled, remove the C-shaped butt joint from the welding fixture to complete the welding.

2. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1, characterized in that, In step a), before installing the first C-shaped part and the second C-shaped part on the welding fixture, the butt joint ends are first beveled so that the butt joint gap of the base plate gradually increases from the 1 / 2 thickness position of the base plate to both sides of the base plate.

3. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1, characterized in that, In step a), at least four support plates are provided, and the side plates on the second side of the first C-shaped member and the second C-shaped member are each supported by at least two support plates.

4. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1 or 3, characterized in that, In step a), on one side of the base plate, the pressure plate is fixedly connected to the positioning seat by connecting bolts; on the side away from the base plate, the pressure plate is fixedly connected to the support plate.

5. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1, characterized in that, In step a), when the first C-shaped member and the second C-shaped member are installed on the limiting surface, the plane on which the base plate is located is a vertical plane.

6. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1, characterized in that, In step a), at least four pressure limiting devices are provided, and the first C-shaped member and the second C-shaped member are each provided with limiting force by at least two of the pressure limiting devices.

7. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1 or 6, characterized in that, In step a), the pressure limiting device is configured as a hydraulic rod, a pneumatic rod, an electromagnetic rod, or a threaded rod.

8. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1, characterized in that, In step b), during each welding process, the base plate is welded first, followed by the side plate on the first side, and finally the side plate on the second side.

9. The welding method for the C-shaped joint of the fusion reactor coil box according to claim 1, characterized in that, In step b), a dial indicator is used to measure the relative positional change of the ends of the first C-shaped part and the second C-shaped part away from the weld.

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