Spent fuel container welding positioning tool and welding method

Abstract

The invention relates to the technical field of welding, in particular to a spent fuel container welding positioning tool and a welding method.According to the positioning tool, the end of a grillwork is limited in the direction perpendicular to the extending direction of a positioning rod piece through a first tool, and grillwork torsion, stress concentration and material damage can be avoided; meanwhile, deformation control is conducted on the side wall of the grillwork in the extending direction of the positioning rod pieces through the second tool, and lateral bending and deformation of the grillwork can be effectively prevented; and the first tool is structurally reinforced through the second tool, so that the positioning tool can be prevented from being bent and deformed under the stress action of deformation of the grillwork, and the structural stability of the positioning tool during working is ensured. According to the welding method of the spent fuel container, by adopting the positioning tool, the assembly and deformation control of the grillwork can be efficiently and accurately carried out, the stability and centering positioning of the grillwork in the assembly and welding process are ensured, the internal stress in the welding process is effectively controlled, and the welding quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding, and particularly relates to a welding positioning tooling and a welding method for spent fuel containers. Background Art

[0002] The spent fuel storage grid is an important device for wet storage of spent fuel. It is generally composed of an array of container units with storage chambers and welded together. Its welding quality is directly related to the safe operation of the device and environmental protection. During the welding process of the existing spent fuel container grid, overall restraint is mainly achieved by strictly controlling and managing the welding process and combining conventional mechanical positioning tooling, and then positioning welding. However, since the conventional mechanical positioning tooling cannot be stably matched with the spent fuel container, and the overall restraint on the container unit to be welded cannot resist the welding deformation of the spent fuel container and cannot release stress well, during the welding process, welding deformation caused by physical changes such as thermal expansion and cooling shrinkage of the material has become a common and unavoidable problem. This deformation may not only reduce the strength of the welded joint, thereby causing problems such as fatigue and corrosion, but also cause defects such as pores and cracks. In severe cases, it may even affect the overall structural stability of the container, thereby threatening the safety of operators and the safety of the surrounding environment. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiency in the prior art that proper positioning and clamping cannot be performed during the welding process of existing spent fuel containers, resulting in welding deformation, and to provide a welding positioning tooling and a welding method for spent fuel containers.

[0004] In a first aspect, the present invention provides a welding positioning tooling for a spent fuel container, including: A first tooling, the first tooling includes two relatively arranged positioning plates, and a plurality of positioning rods are provided on the positioning plates, and the positioning rods can be adapted to the end notches in the longitudinal direction of the grid; A second tooling, the second tooling includes a beam body, both ends of the beam body are respectively connected to the positioning plates, and a plurality of pressing members for abutting against the side wall of the grid are provided on the beam body; The abutting directions of the plurality of pressing members are perpendicular to the extending direction of the positioning rods.

[0005] A welding positioning tooling for spent fuel containers of the present invention. By embedding the positioning rod of the first tooling into the end notch in the longitudinal direction of the grid, the end of the grid is limited perpendicular to the extension direction of the positioning rod, which can avoid the torsion of the grid. And since the grid is only limited in one direction at the end position, the deformation can be released in the unrestricted direction, which can avoid stress concentration and material damage and improve the welding quality. At the same time, by using the pressing part of the second tooling to abut against the side wall of the grid and controlling the deformation of the side wall of the grid along the extension direction of the positioning rod, it can effectively prevent the grid from bending and deforming laterally. And by strengthening the structure of the first tooling with the second tooling, it can avoid the bending and deformation of the positioning tooling under the stress of the grid deformation, ensuring the structural stability of the positioning tooling during work. By combining various limiting and supporting means, the positioning tooling can effectively control the deformation trend without completely restricting the deformation, thereby reducing the stress impact on the material during the welding process, and then improving the welding quality and reducing the welding cost.

[0006] Preferably, a number of positioning claws are further provided on the beam body. The positioning claws extend out of the beam body along the abutting direction, and the part of the positioning claws extending out of the beam body can be in contact with the lateral side wall of the grid. A number of the positioning claws are arranged oppositely on the beam body. By further abutting against the side wall of the grid with the positioning claws, additional resistance can be provided to counter the possible lateral deformation and avoid the grid from being distorted and deformed during the welding process.

[0007] Preferably, a number of sliding grooves are provided on the positioning plate, and the positioning rod is arranged in the sliding grooves. A profile surface with a tolerance fit with the end notch is provided on the side of the positioning rod away from the positioning plate. The position and quantity of the positioning rods can be adjusted according to the actual arrangement order of the grids.

[0008] Preferably, an assembly hole is provided in the middle of the positioning plate. The positioning plate includes a number of wing plates, and the number of the wing plates is distributed around the central axis of the assembly hole. A number of the positioning rods can be respectively arranged on each wing plate. It enables the use of a suitable positioning plate according to the actual structure of the grid to realize the welding of grids with different combined structures and expand the application range of the positioning tooling.

[0009] Preferably, the positioning plate includes four wing plates, and the four wing plates form a cross-shaped positioning plate. It can provide necessary space for subsequent welding, improve the flexibility of using the positioning tooling, and ensure the structural balance of the positioning plate, and can maintain the structural stability during subsequent rotation or movement.

[0010] Preferably, a number of through grooves are provided on the positioning plate, and a number of through holes are provided in the through grooves. The through grooves can communicate with the end of the grid. To realize the smooth diversion of welding heat through the combination of the through grooves and the through holes and avoid the deformation caused by the accumulation of welding high temperature.

[0011] Preferably, the positioning plate is provided with a limit block, and the limit block can be in contact with the side wall or corner of the grid, so as to further ensure the effective centering and positioning of the grid.

[0012] Preferably, the beam body comprises a steel truss structure, a first pin hole is provided at the end of the beam body, a plurality of second pin holes are arranged on the positioning rod, and the beam body and the positioning rod can be connected by a pin shaft adapted to the first pin hole and the second pin hole. The beam body of the steel truss structure has sufficient rigidity to resist the stress generated on the positioning plate during the deformation of the grid, and the connection through the pin shaft is more convenient, has better load-bearing capacity, can stably resist possible deformation torque, and avoid torsional deformation of the grid during welding.

[0013] Preferably, the beam body includes a rib plate, and a plurality of the crimping parts are arranged on the rib plate; the crimping parts include an adjustment column, a crimping block and a locking part, the adjustment column passes through the rib plate, the crimping block is connected to the end of the adjustment column, and the locking part is threadedly connected to the adjustment column. The rib plate is used to realize the setting and adjustment of multiple crimping parts, and the crimping parts can be adjusted to abut against the side wall of the grid according to actual conditions.

[0014] In a second aspect, the present invention provides a spent fuel container welding method, using a spent fuel container welding positioning tool as described above, and comprising the following steps: S1, assembling the first tooling on a positioner, and assembling the two positioning plates oppositely on the head frame and tail frame of the positioner; S2, arranging positioning rods on the positioning plate in the order of the grid arrangement; S3, assembling a grid between the two positioning plates so that the positioning rods are embedded in the end notches of the grid; S4. Assemble the second tooling between the two positioning plates, connect the beam body with the positioning plates, and adjust the crimping piece to abut against the side wall of the grid.

[0015] A spent fuel container welding method of the present invention, by adopting the above-mentioned positioning tool, can efficiently and accurately assemble and control the deformation of the grid, ensure the stability and centering positioning of the grid during assembly and welding, effectively control the internal stress of the welding process, which is conducive to improving welding quality, reducing welding costs, and improving welding efficiency. Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a spent fuel container welding positioning tool, wherein the positioning rod of the first tool is embedded in the longitudinal end notch of the grid, and the end of the grid is limited perpendicular to the extension direction of the positioning rod, so as to avoid the grid from twisting; 2. The present invention provides a welding positioning tooling for spent fuel containers. By means of the first tooling, the grid is limited in only one direction at the end position, and the deformation can be released in the unrestricted direction, which can avoid stress concentration and material damage and improve the welding quality. 3. The present invention provides a welding positioning tooling for spent fuel containers. The pressing member of the second tooling abuts against the side wall of the grid to control the deformation of the side wall of the grid along the extension direction of the positioning rod, which can effectively prevent the grid from bending and deforming laterally. 4. The present invention provides a welding positioning tooling for spent fuel containers. The second tooling strengthens the structure of the first tooling, which can avoid the bending and deformation of the positioning tooling under the stress of the grid deformation and ensure the structural stability of the positioning tooling during operation. 5. The present invention provides a welding positioning tooling for spent fuel containers. By combining various limiting and supporting means, the deformation trend can be effectively controlled without completely restricting the deformation, thereby reducing the stress impact on the material during the welding process, and further improving the welding quality and reducing the welding cost. 6. The present invention provides a welding method for spent fuel containers. By using the above-mentioned positioning tooling, the assembly and deformation control of the grid can be carried out efficiently and accurately, ensuring the stability, centering and positioning of the grid during the assembly and welding processes, effectively controlling the internal stress during the welding process, being beneficial to improving the welding quality, reducing the welding cost and improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The front view of a welding positioning tooling for a spent fuel container in Embodiment 1; Figure 2 The top view of a welding positioning tooling for a spent fuel container in Embodiment 1; Figure 3 The axonometric view of a welding positioning tooling for a spent fuel container in Embodiment 1; Figure 4 The structural schematic diagram of the positioning plate in Embodiment 1; Figure 5 For Figure 4 The enlarged partial structural schematic diagram at A in Figure 6 The structural schematic diagram of the beam body in Embodiment 1; Figure 7 The partial structural schematic diagram of the beam body in Embodiment 1; Figure 8 The clamping state diagram of a welding positioning tooling for a spent fuel container in Embodiment 1; Figure 9 The usage state diagram of a welding positioning tooling for a spent fuel container on a positioner in Embodiment 1.

[0017] Markings in the figure: 1 - positioning plate, 11 - slideway, 12 - assembly hole, 13 - wing plate, 14 - through hole, 15 - through slot, 16 - limiting block, 2 - positioning rod, 21 - profile surface, 22 - second pin hole, 3 - grid, 31 - end notch, 4 - beam body, 41 - first pin hole, 42 - rib plate, 5 - crimping part, 51 - adjusting column, 52 - crimping block, 53 - locking part, 6 - positioning claw, 7 - pin shaft, 8 - positioner, 81 - headstock, 82 - tailstock. Detailed implementation manners

[0018] The present invention will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0019] In the description of the specific embodiments of the present invention, without special explanation, the expression terms of orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / equipment is usually used and placed. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0020] In addition, for terms such as "horizontal", "vertical", "hanging", "parallel", etc., it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8% of the error / deviation, more preferably within ±6% of the error / deviation, more preferably within ±5% of the error / deviation, more preferably within ±4% of the error / deviation. As long as the corresponding device / component / element is within the error / deviation range, it can still perform its function in the solution of the present invention.

[0021] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0022] In addition, in the description of the embodiments of the present invention, "several", "multiple", and "a number of" represent at least two. It can be any case such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a case of more than 9.

[0023] In addition, in the description of the technical solutions of the present invention, unless otherwise clearly specified / defined / restricted, where the terms "set", "installed", "connected", "coupled", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0024] Embodiment 1 As Figures 1 - 8 shown, a welding positioning tooling for a spent fuel container includes a first tooling and a second tooling. The first tooling includes two relatively arranged positioning plates 1. A number of positioning rods 2 are provided on the positioning plates 1, and the positioning rods 2 can be adapted to the end notches 31 in the longitudinal direction of the grid 3. The second tooling includes a beam body 4. Both ends of the beam body 4 are respectively connected to the positioning plates 1. A number of pressing members 5 for abutting against the side walls of the grid 3 are provided on the beam body 4. The abutting directions of the number of pressing members 5 are perpendicular to the extending direction of the positioning rods 2.

[0025] In one or a number of embodiments, the positioning rods 2 are straight rod-shaped structural members, and the length is greater than the cross-sectional width of the grid 3. The positioning plates 1 are plate-shaped structural members. The extending direction of the positioning rods 2 is parallel to the plate surface of the positioning plates 1. A plurality of positioning rods 2 are arranged on the positioning plates 1 according to the arrangement state of the container units of the grid 3. During use, one side of the positioning rods 2 is attached to the positioning plates 1, and the other side of the positioning rods 2 away from the positioning plates 1 is embedded into the end notches 31 in the longitudinal direction of the grid 3, so that each positioning rod 2 only limits the end notches 31 in a single direction. Therefore, the container units of the grid 3 can be respectively limited in one direction. Taking the end notches 31 of the grid 3 as the positioning reference, the torsion of the grid 3 during welding can be restricted, avoiding the accumulation of internal stress that may be caused by completely restricting the degrees of freedom and resulting in an uncontrollable deformation trend. At the same time, by embedding a plurality of positioning rods 2 on the two relatively arranged positioning plates 1 into the end notches 31 at both longitudinal ends of the grid 3, the end notches 31 of a plurality of container units on the grid 3 can be respectively limited, ensuring the overall stability and central positioning of the grid 3 during the assembly and welding processes.

[0026] In an alternative embodiment, the side of the positioning rod 2 away from the positioning plate 1 can be provided with a profile surface 21 that is in tolerance fit with the end notch 31. The profile surface 21 is prepared based on the minimum fit tolerance with the end notch 31, so that the positioning rod 2 fits tightly with the end notch 31. After being inserted into the end notch 31, the positioning reference function of the end notch 31 can be fully utilized to achieve efficient and accurate positioning and centering of the grid 3.

[0027] In an alternative embodiment, a plurality of sliding grooves 11 are provided on the positioning plate 1, and the positioning rod 2 is arranged in the sliding grooves 11. The positioning rod 2 can move within the sliding grooves 11 to adapt to the end limit of the grids 3 in different arrangements, and a single positioning rod 2 can be used to stably limit the single-row or single-column grids 3 arranged along the extension direction of the positioning rod 2. At the same time, since both sides of the width of the positioning rod 2 are limited by the inner wall of the sliding groove 11, the welding deformation torque of the grid 3 can also be smoothly transmitted to the side wall of the sliding groove 11, improving the anti-torsion effect of the positioning rod 2.

[0028] As Figures 4 - 5 shown, a plurality of sliding grooves 11 can be arranged in parallel on the positioning plate 1, such as two or three. The spacing between the sliding grooves 11 is related to the arrangement of the grids 3, and the position and number of the positioning rods 2 can be adjusted according to the actual arrangement order of the grids 3, and the positioning rods 2 can be reasonably arranged, so that a single positioning plate 1 can be used to achieve stable positioning and centering limit of the multi-row and multi-column grids 3, ensuring that the overall grid 3 will not be displaced during the assembly and welding processes, and improving the assembly and welding quality.

[0029] In an alternative embodiment, the positioning rod 2 can be freely slidably arranged in the sliding groove 11 and be limited on the positioning plate 1 by the relative moving force provided by the auxiliary equipment installed and connected by the two positioning plates 1, or can be detachably connected to the positioning plate 1 through connecting parts such as bolts and pins.

[0030] In one or several embodiments, an assembly hole 12 is provided in the middle of the positioning plate 1. The positioning plate 1 includes a plurality of wing plates 13, and the plurality of wing plates 13 are distributed around the central axis of the assembly hole 12. A plurality of positioning rods 2 can be respectively arranged on each wing plate 13. Thus, a positioning plate 1 with a shape adapted to the actual structure of the grid 3 can be used to realize the welding of grids 3 with different combined structures, expanding the application range of the positioning tooling.

[0031] Preferably, as Figure 4 shown, the positioning plate 1 includes four wing plates 13, and the four wing plates 13 form a cross-shaped positioning plate 1. Three sliding grooves 11 are respectively provided on each wing plate 13. It can provide necessary space for subsequent welding, improve the flexibility of using the positioning tooling, and ensure the structural balance of the positioning plate 1, so that the structure can remain stable during subsequent rotation or movement.

[0032] In one or several embodiments, a plurality of through slots 15 are provided on the positioning plate 1, and a plurality of through holes 14 are provided in the through slots 15. The through slots 15 can communicate with the end of the grid frame 3. The combined use of the through slots 15 and the through holes 14 can smoothly conduct the welding heat, avoiding deformation caused by the accumulation of welding high temperature.

[0033] In an alternative embodiment, the through slots 15 can be provided to penetrate the positioning plate 1 in the transverse and longitudinal directions. During use, there is a gap with the same depth as the through slots 15 between the end of the grid frame 3 and the positioning plate 1. The heat during the welding process of the grid frame 3 is transmitted longitudinally along the grid frame 3 to the position of the positioning plate 1, and is dissipated along the channel or output from the through holes 14, achieving smooth conduction of the welding heat, thereby improving the welding quality and avoiding welding deformation.

[0034] In one or several embodiments, a limiting block 16 is provided on the positioning plate 1. The limiting block 16 can be in contact with the side wall or corner of the grid frame 3 to further ensure the effective centering and positioning of the grid frame 3.

[0035] In an alternative embodiment, the limiting block 16 can be a convex block structure reserved during the machining process of the positioning plate 1, or can be welded to the positioning plate 1 according to the layout of the grid frame 3, or can be a removable structure inserted into the holes reserved on the positioning plate 1 according to the actual situation.

[0036] In one or several embodiments, the beam body 4 is a long strip-shaped structural member with the same or similar longitudinal length as the grid frame 3. A plurality of pressing members 5 are arranged longitudinally along the beam body 4. During use, the longitudinal ends of the beam body 4 are connected to the positioning plate 1, connecting the two positioning plates 1 into a whole, which can resist the stress generated during the deformation of the grid frame 3, preventing the positioning tooling from bending under the action of the deformation stress of the grid frame 3. At the same time, by providing a plurality of height-adjusting members on the beam body 4 as the pressing members 5, adjusting the pressing members 5 to support between the grid frame 3 and the beam body 4 and pressing the grid frame 3, it is possible to prevent welding deformation by providing a reaction force, enabling the beam body 4 and the pressing members 5 to control the deformation in a direction where the grid frame 3 is not limited by the positioning rod 2, cooperating with the positioning rod 2, effectively achieving the purpose of controlling the overall deformation of the grid frame 3 and avoiding problems caused by stress concentration.

[0037] In one or several embodiments, first pin holes 41 are provided at both longitudinal ends of the beam body 4. The axial direction of the first pin holes 41 is consistent with the longitudinal direction of the beam body 4. A plurality of second pin holes 22 are arranged on the positioning rod 2. The axial direction of the second pin holes 22 is perpendicular to the longitudinal direction of the positioning rod 2. During use, the beam body 4 and the positioning rod 2 can be stably connected through a pin shaft 7 passing through the first pin holes 41 and the second pin holes 22, enabling the beam body 4 to resist the deformation torque force generated by the deformation of the grid 3 on the positioning tooling, ensuring the structural stability of the positioning tooling, and avoiding torsional deformation of the grid 3 during the welding process; by adjusting the pin shaft 7 to be inserted and matched with different second pin holes 22, the relative positions of the beam body 4 and the positioning rod 2 can be adjusted to adapt to grids 3 in different arrangement combinations.

[0038] In an alternative embodiment, the beam body 4 can be a steel truss structural member, which can be formed by welding multiple steel members or machined from steel members.

[0039] In an alternative embodiment, the overall stiffness of the beam body 4 is greater than the overall stiffness of the grid 3 structure.

[0040] Preferably, as Figure 6 shown, the beam body 4 includes two parallel steel plates, which are connected by rib plates 42 penetrating longitudinally along the beam body 4. The steel plates and the rib plates 42 are perpendicular to each other. A plurality of pressing members 5 are arranged on the rib plates 42. Local hollowing is provided on the steel plates according to the installation positions of the pressing members 5 to facilitate the installation and adjustment of the pressing members 5. According to the setting requirements of the first pin holes 41, stiffening ribs are welded locally at both ends of the beam body 4, which can enhance the torsional strength of the beam body 4 and also facilitate the connection between the beam body 4 and the positioning plate 1.

[0041] In an alternative embodiment, the beam body 4 can be made of high-strength steel, enabling the beam body 4 to have sufficient strength to resist the stress exerted on the positioning tooling by the deformation of the grid 3.

[0042] In an alternative embodiment, the beam body 4 can be arranged oppositely on both sides of the grid 3. During use, the beam body 4 can be lifted by the pressing members 5 to squeeze the pin shaft 7, so that the pin shaft 7 is stably fixed and loosened by friction with the positioning rod body, and relative deformation control is performed in two directions of the width of the grid 3 to improve the deformation control effect.

[0043] In an alternative embodiment, the beam body 4 can also be correspondingly arranged on each wing plate 13 according to the actual situation to further enhance the anti-deformation control ability of the positioning tooling.

[0044] In an alternative embodiment, the crimping member 5 includes an adjusting post 51, a crimping block 52, and a locking member 53. The adjusting post 51 passes through the rib plate 42, the crimping block 52 is connected to the end of the adjusting post 51, and the locking member 53 is threadedly connected to the adjusting post 51. The rib plate 42 is used to arrange and adjust multiple crimping members 5, forming multiple pressing points between the grid 3 and the beam body 4. An appropriate number of crimping members 5 can be adjusted according to the actual situation to abut against the side wall of the grid 3, so as to apply a reaction force to prevent welding deformation.

[0045] Preferably, as Figure 7 shown, the locking member 53 can be a structural member with an internal threaded hole, which can be welded to the side surface of the rib plate 42 away from the grid 3. Preferably, the locking member 53 and the adjusting post 51 are connected by a rectangular thread, which can realize the self-locking of the relative position between the locking member 53 and the adjusting post 51, prevent the adjusting post 51 from retracting under force, and ensure the continuous and stable pressing of the grid 3.

[0046] In one or several embodiments, several positioning claws 6 can also be provided on the beam body 4. The positioning claws 6 extend out of the beam body 4 along the abutting direction, and the part of the positioning claws 6 extending out of the beam body 4 can be in contact with the lateral side wall of the grid 3. The positioning claws 6 can further abut against the side wall of the grid 3 to provide additional resistance against possible lateral deformation and distortion, and prevent the grid 3 from being distorted during welding.

[0047] Preferably, as Figure 6 shown, the positioning claws 6 can be structural blocks welded to the side walls in the width direction of the beam body 4. Every two positioning claws 6 are symmetrically arranged in the width direction of the beam body 4, and multiple positioning claws 6 are arranged longitudinally along the beam body 4.

[0048] A welding positioning tooling for a spent fuel container in this embodiment, compared with the conventional assembly that completely restricts deformation and may cause stress concentration and material damage, by embedding the positioning rod 2 of the first tooling into the end notch 31 in the longitudinal direction of the grid 3, the end of the grid 3 is limited perpendicular to the extension direction of the positioning rod 2. Since the grid 3 is only limited in one direction at the end position, the deformation can be released in the unrestricted direction. At the same time, by using the pressing member 5 of the second tooling to abut against the side wall of the grid 3, the deformation of the side wall of the grid 3 is controlled along the extension direction of the positioning rod 2, which can effectively prevent the grid 3 from lateral bending and deformation. And by strengthening the structure of the first tooling with the second tooling, it can avoid the bending and deformation of the positioning tooling under the stress of the deformation of the grid 3, ensuring the structural stability of the positioning tooling during operation. Thus, under the assembly with incomplete restriction of deformation of the grid 3, the deformation trend can be effectively controlled, and the purpose of reducing the possible stress influence on the material during the welding process can be achieved. Furthermore, the welding quality can be improved, the structural weaknesses caused by welding deformation can be avoided, and the reliability and safety of the spent fuel container in the high-pressure and high-temperature environment can be ensured. It can provide better shape retention ability in the later stage of welding, providing guarantee for the service life of the spent fuel container. And due to the improvement of the welding quality and the effective control of the welding deformation, the subsequent trimming and processing requirements can be correspondingly reduced, the production cost can be lowered, and at the same time, it is beneficial to improve the production efficiency.

[0049] Embodiment 2 A welding method for a spent fuel container in this embodiment uses a welding positioning tooling for a spent fuel container in Embodiment 1 and includes the following steps: S1. Assemble the first tooling on the positioner 8, and relatively assemble the two positioning plates 1 on the headstock 81 and the tailstock 82 of the positioner 8. S2. Arrange the positioning rods 2 on the positioning plates 1 according to the arrangement order of the grids 3. S3. Assemble the grid 3 between the two positioning plates 1, and make the positioning rod 2 embed into the end notch 31 of the grid 3. S4. Assemble the second tooling between the two positioning plates 1, connect the beam body 4 with the positioning plate 1, and adjust the pressing member 5 to abut against the side wall of the grid 3.

[0050] A welding method for a spent fuel container in this embodiment, as Figures 1 - 9As shown in the figure, the positioner 8 has a fixed headstock 81 and a movable tailstock 82. Before welding, the two positioning plates 1 are respectively assembled to the corresponding headstock 81 and tailstock 82 through the assembly holes 12 to ensure the overall stability and accuracy of the positioning tooling during the entire assembly process. Then, the tailstock 82 is moved away from the headstock 81, and the grid frame 3 is hoisted and assembled between the headstock 81 and the tailstock 82. The grid frame 3 is assembled on the headstock 81, and then the grid frame 3 is tightened by the tailstock 82, so that the positioning rod 2 of the tailstock 82 is embedded into the corresponding end notch 31, realizing the positioning of both ends of the grid frame 3 respectively. Then, the beam body 4 is assembled, and the deformation of the grid frame 3 is controlled by the crimping part 5. After the corresponding assembly is completed, welding is carried out. Thus, by using the above specific positioning tooling, the assembly and deformation control of the grid frame 3 can be carried out efficiently and accurately, ensuring the section and performance stability of the final assembly structure, optimizing the welding process, ensuring the stability and centering positioning accuracy of the grid frame 3 during the assembly and welding processes, effectively controlling the internal stress during the welding process, being beneficial to improving the welding quality, reducing the welding cost and potential risks, and improving the welding efficiency.

[0051] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A spent fuel container welding positioning tool, characterized in that: include: A first tool, the first tool comprising two positioning plates (1) arranged opposite to each other, the positioning plates (1) being provided with a plurality of positioning rods (2), the positioning rods (2) being adapted to fit with longitudinal end notches (31) of the grid (3); A second tooling, the second tooling comprising a beam body (4), the two ends of the beam body (4) being respectively connected to the positioning plate (1), and the beam body (4) being provided with a plurality of crimping parts (5) for abutting against the side walls of the grid (3); The abutment direction of the plurality of crimping members (5) is perpendicular to the extension direction of the positioning rod (2).

2. A spent fuel container welding positioning tool according to claim 1, characterized in that: The beam body (4) is also provided with a plurality of positioning claws (6), the positioning claws (6) extending out of the beam body (4) along the abutment direction, and the part of the positioning claws (6) extending out of the beam body (4) can abut against the transverse side wall of the grid (3); the plurality of positioning claws (6) are arranged relatively on the beam body (4).

3. A spent fuel container welding positioning tool according to claim 1, characterized in that: The positioning plate (1) is provided with a plurality of slideways (11), and the positioning rod (2) is arranged in the slideways (11); the side of the positioning rod (2) away from the positioning plate (1) is provided with a profile (21) that matches the tolerance of the end notch (31).

4. A spent fuel container welding positioning tool according to claim 1, characterized in that: The positioning plate (1) is provided with an assembly hole (12) in the middle thereof. The positioning plate (1) comprises a plurality of wing plates (13). The plurality of wing plates (13) are distributed around the central axis of the assembly hole (12). A plurality of the positioning rods (2) can be respectively arranged on each of the wing plates (13).

5. A spent fuel container welding positioning tool according to claim 4, characterized in that: The positioning plate (1) comprises four wing plates (13), and the four wing plates (13) form a cross-shaped positioning plate (1).

6. A spent fuel container welding positioning tool according to claim 1, characterized in that: The positioning plate (1) is provided with a plurality of through slots (15), the through slots (15) are provided with a plurality of through holes (14), and the through slots (15) can be connected to the ends of the grid (3).

7. A spent fuel container welding positioning tool according to claim 1, characterized in that: The positioning plate (1) is provided with a limiting block (16), and the limiting block (16) can be in contact with the side wall or corner of the grid (3).

8. A spent fuel container welding positioning tool according to any one of claims 1 to 7, characterized in that: The beam body (4) comprises a steel truss structure, a first pin hole (41) is provided at the end of the beam body (4), a plurality of second pin holes (22) are arranged on the positioning rod (2), and the beam body (4) and the positioning rod (2) can be connected via a pin shaft (7) adapted to the first pin hole (41) and the second pin hole (22).

9. A spent fuel container welding positioning tool according to claim 8, characterized in that: The beam body (4) includes a rib plate (42), and a plurality of crimping parts (5) are inserted through the rib plate (42); the crimping parts (5) include an adjusting column (51), a crimping block (52) and a locking part (53); the adjusting column (51) passes through the rib plate (42), the crimping block (52) is connected to the end of the adjusting column (51), and the locking part (53) is threadedly connected to the adjusting column (51).

10. A method for welding a spent fuel container, characterized in that: A spent fuel container welding positioning tool as claimed in any one of claims 1 to 9 is used, and comprises the following steps: S1, assembling the first tool on a positioner (8), and assembling the two positioning plates (1) on the head frame (81) and the tail frame (82) of the positioner (8) opposite to each other; S2, arranging the positioning rods (2) on the positioning plate (1) according to the arrangement order of the grids (3); S3, assembling a grid frame (3) between the two positioning plates (1) so that the positioning rod (2) is embedded in the end notch (31) of the grid frame (3); S4. Assemble the second tooling between the two positioning plates (1), connect the beam body (4) to the positioning plates (1), and adjust the crimping piece (5) to abut against the side wall of the grid (3).

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