Welding deformation prevention structure for important components of large nuclear power plant

Abstract

The utility model provides a kind of important component welding anti-deformation structure for large nuclear power, it is related to nuclear power equipment anti-deformation technical field, including main base plate, anti-deformation support frame, anti-deformation stretching frame;Main base plate middle part is equipped with portal welding area, portal steel plate extends and is welded with main base plate;Anti-deformation support frame is installed in main base plate inner side, include center column, cross tensioning bar, reinforcing plate and connecting plate, connect with center column by equidistant distribution cross tensioning bar, and reinforcing plate is arranged in connecting portion to enhance rigidity;Anti-deformation stretching frame is equipped in main base plate outer side, is constituted by vertical board and multiple cross plates, integral welding is fixed.Welding, C50 chamfer is additionally provided at T-shaped welding leg to eliminate stress concentration, and symmetric welding process is used, and after welding, eliminate stress heat treatment is carried out with tooling.This structure controls welding deformation by simulation board, tooling and process design cooperation, ensures flatness and sealing.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power equipment anti-deformation technology, and more specifically, to a welding anti-deformation structure for important components used in large nuclear power plants. Background Technology

[0002] In the nuclear power, chemical, and military industries, equipment with extremely high sealing requirements often contains complex welded structures consisting of multiple sets of fully welded horizontal and vertical masts and enclosures. These structures require stress-relieving heat treatment after welding to meet sealing and assembly requirements. However, the uneven heat input during welding and the stress release after heat treatment can easily lead to workpiece flatness deviations, resulting in sealing failures or assembly difficulties.

[0003] In existing technologies, welding deformation control for thin-plate structures largely relies on traditional clamps or rigid fixing methods. However, these methods are difficult to adapt to the process requirements of large-size, vertical welding. Furthermore, the T-shaped weld leg area is prone to stress concentration due to geometric abrupt changes, leading to incomplete weld penetration or cracking, further exacerbating the risk of deformation. Simultaneously, an unreasonable welding sequence or uneven heat input distribution can also exacerbate the cumulative deformation of the overall structure, making it difficult to meet high-precision flatness and perpendicularity requirements.

[0004] Therefore, there is an urgent need for a welding deformation prevention solution that integrates structural design and process control to ensure the manufacturing quality and functional reliability of such important components. Utility Model Content

[0005] To address the aforementioned technical problems, this invention provides a welding deformation-resistant structure for critical components used in large nuclear power plants. This invention controls welding deformation of large nuclear power components and ensures sealing by using a main base plate, a deformation-resistant support frame, a deformation-resistant tension frame, and adding a C50 chamfer at the T-shaped weld feet.

[0006] To achieve the above objectives, this utility model provides a welding anti-deformation structure for important components used in large nuclear power plants, comprising: a main base plate, an anti-deformation support frame, and an anti-deformation tension frame; A gantry welding area is provided in the middle of the main substrate, and the gantry welding area extends 50mm to one side to weld the gantry steel plate. The anti-deformation support frame is installed on the inner side of the main base plate, covering the gantry welding area, and is provided with an inner support structure for supporting the gantry; at least one central column is straddling the gantry welding area and connected to it to prevent welding deformation. The anti-deformation tension frame is installed on the outside of the main base plate and includes a vertical plate, a first horizontal plate, a second horizontal plate, and a third horizontal plate.

[0007] Furthermore, the anti-deformation support frame includes a central column, horizontal tie rods, a reinforcing plate, and a connecting plate; the connecting plate is disposed at the ends of the central column and the horizontal tie rods, and the reinforcing plate is disposed at the connection between the horizontal tie rods and the central column.

[0008] Furthermore, the horizontal tie rod specifically includes multiple transverse components equidistantly distributed along the width direction of the gantry, and at least one pair of reinforcing plates are arranged at the connection between each horizontal tie rod and the central column.

[0009] Furthermore, the gantry steel plate is provided with mounting holes that match the anti-deformation support frame connecting plate.

[0010] Furthermore, the internal support structure includes several tie rods that provide support from above the gantry steel plate to prevent deformation.

[0011] Furthermore, the anti-deformation support frame and the anti-deformation tension frame are both welded and fixedly connected to the main base plate.

[0012] Furthermore, after welding the gantry steel plate, the anti-deformation support frame, and the anti-deformation tension frame, they need to undergo stress-relieving heat treatment together with the tooling.

[0013] Furthermore, a C50 chamfer is added to the T-shaped weld feet where stress concentration is likely to occur.

[0014] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: 1. This utility model provides a welding anti-deformation structure for important components in large nuclear power plants. It employs an anti-deformation support frame composed of a central column, horizontal tie rods, reinforcing plates, and connecting plates, combined with a tension frame consisting of outer vertical plates and multiple sets of horizontal plates. Through the dual action of internal support and external tension, it effectively suppresses deformation of the gantry steel plate caused by thermal stress during welding. The tie rods on the inner side of the support frame and the structure on the outer side of the tension frame together form an anti-deformation control system, ensuring the flatness and verticality of the main base plate and the welding area of ​​the gantry, meeting the high requirements of nuclear power equipment for sealing and assembly precision.

[0015] 2. This utility model provides a welding deformation-resistant structure for important components used in large nuclear power plants. Addressing the issue of stress concentration easily caused by T-shaped weld legs, this solution adds a C50 chamfer at the weld leg, optimizes the welding path, and ensures complete weld penetration while avoiding localized stress concentration. Simultaneously, a multi-person symmetrical welding process is employed to evenly distribute heat input, reducing welding deformation and secondary deformation caused by stress release after heat treatment, thereby improving the mechanical properties and structural reliability of the welded joint. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the anti-deformation tensile frame and the overall structure of a welding anti-deformation structure for an important component of a large nuclear power plant, as described in this utility model. Figure 2 This is a schematic diagram of a deformation-resistant support frame for welding important components of large nuclear power plants, as described in this utility model.

[0018] In the diagram: 1. Main base plate; 2. Anti-deformation support frame; 21. Central column; 22. Horizontal tie rod; 23. Reinforcing plate; 24. Connecting plate; 3. Anti-deformation tension frame; 31. Vertical plate; 32. First horizontal plate; 33. Second horizontal plate; 34. Third horizontal plate. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0024] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0025] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0026] like Figures 1 to 2As shown, this utility model provides a welding anti-deformation structure for important components used in large nuclear power plants, including: a main base plate 1, an anti-deformation support frame 2, and an anti-deformation tension frame 3; The main substrate 1 has a thickness of 50mm and a diameter of 5000mm. A 3200mm x 2400mm gantry welding area is provided in the middle, and the gantry welding area extends 50mm to one side to weld gantry steel plates. An anti-deformation support frame 2 is installed on the inner side of the main substrate 1, covering the gantry welding area, and is provided with an internal support structure for supporting the gantry. At least one central column 21 is straddling the gantry welding area and connected to it to prevent welding deformation. An anti-deformation tension frame 3 is installed on the outer side of the main substrate 1, including a vertical plate 31, a first horizontal plate 32, a second horizontal plate 33, and a third horizontal plate 34, forming an integral support structure. Through the synergistic effect of the anti-deformation support frame 2 and the anti-deformation tension frame 3, welding deformation is effectively controlled, ensuring the flatness and sealing requirements of the gantry welding area.

[0027] Furthermore, the anti-deformation support frame 2 includes a central column 21, horizontal tie rods 22, reinforcing plates 23, and connecting plates 24. The connecting plates 24 are disposed at the ends of the central column 21 and the horizontal tie rods 22, and the reinforcing plates 23 are disposed at the connection between the horizontal tie rods 22 and the central column 21. The horizontal tie rods 22 specifically include multiple transverse components equidistantly distributed along the width direction of the gantry. At least one pair of reinforcing plates 23 are arranged at the connection between each horizontal tie rod 22 and the central column 21. The cooperation between the connecting plates 24 and the reinforcing plates 23 ensures the rigidity of the anti-deformation support frame 2, prevents local collapse or twisting of the gantry steel plate during welding, and the multi-point support design effectively disperses welding stress, avoiding cracks caused by stress concentration. In addition, the equidistantly distributed horizontal tie rods 22 and the reinforcing plates 23 work together to improve the overall rigidity of the anti-deformation support frame 2 and prevent welding deformation from exceeding the tolerance range.

[0028] Furthermore, the gantry steel plate is provided with mounting holes that match the connecting plate 24 of the anti-deformation support frame 2. The matching design of the mounting holes and the connecting plate 24 ensures the precise positioning of the anti-deformation support frame 2 and the gantry steel plate, avoiding structural deviations caused by displacement during the welding process.

[0029] Furthermore, the internal support structure includes several tie rods that provide tension from above the gantry steel plate to prevent deformation. The tie rods apply pre-tightening force from above the gantry steel plate to offset the deformation caused by welding thermal stress, ensuring the flatness of the gantry steel plate after welding. The tension structure and the anti-deformation support frame 2 work together to improve the overall structural stability.

[0030] Furthermore, the anti-deformation support frame 2 and the anti-deformation tension frame 3 are all welded and fixedly connected to the main base plate 1. The welding and fixing method ensures that the anti-deformation structure and the main base plate 1 form an integral rigid system, avoiding structural loosening caused by external forces during the welding process.

[0031] Furthermore, after the gantry steel plate, the anti-deformation support frame 2 and the anti-deformation tension frame 3 are welded, they need to undergo stress-relieving heat treatment together with the tooling.

[0032] Furthermore, a C50 chamfer is added to the T-shaped weld leg where stress concentration is prone to occur. The C50 chamfer eliminates stress concentration at the T-shaped weld leg, avoids the generation of welding cracks, and the full penetration structure improves the strength and sealing of the welded joint, meeting the stringent requirements of nuclear power equipment.

[0033] Implementation process of this device: First, the simulation board is leveled with the 50mm thick, 5000mm diameter main base plate 1. Then, an anti-deformation support frame 2, consisting of a central column 21, horizontal tie rods 22, reinforcing plate 23 and connecting plate 24, is installed on the inner side of the main base plate 1, covering the 3200mm x 2400mm gantry welding area. The outer side is fixed by an anti-deformation tension frame 3 consisting of vertical plate 31, first horizontal plate 32, second horizontal plate 33 and third horizontal plate 34.

[0034] A C50 chamfer is added at the T-shaped weld feet of the gantry steel plate and the main base plate 1 to eliminate stress concentration. Then, a multi-person symmetrical welding process is used to weld the gantry steel plate and the cross plate simultaneously. During the welding process, the gantry welding fixture and tie rods are used to pull the gantry from above to prevent deformation.

[0035] After welding, the substrate is subjected to stress relief heat treatment with tooling. After the flatness meets the standard, the substrate with reserved processing amount is welded on the reverse side. Finally, the overall welded structure is heat treated again, and each substrate is processed with the sealing surface as the reference to ensure flatness and sealing requirements.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A welded deformation-resistant structure for a key component in a large nuclear power plant, characterized in that, include: Main base plate, anti-deformation support frame, anti-deformation tension frame; The main base plate has a gantry welding area in the middle, and the gantry welding area extends 50mm to one side to weld the gantry steel plate. The anti-deformation support frame is installed on the inner side of the main base plate, covering the gantry welding area, and is provided with an inner support structure for supporting the gantry; at least one central column is straddling the gantry welding area and connected to it to prevent welding deformation. The anti-deformation tension frame is installed on the outside of the main base plate and includes a vertical plate, a first horizontal plate, a second horizontal plate, and a third horizontal plate.

2. The anti-deformation welding structure for important components in large nuclear power plants according to claim 1, characterized in that, The anti-deformation support frame includes a central column, horizontal tie rods, a reinforcing plate, and a connecting plate; the connecting plate is disposed at the ends of the central column and the horizontal tie rods, and the reinforcing plate is disposed at the connection between the horizontal tie rods and the central column.

3. The anti-deformation welding structure for important components in large nuclear power plants according to claim 2, characterized in that, The horizontal tie rod specifically includes multiple transverse components equidistantly distributed along the width direction of the gantry, and at least one pair of reinforcing plates are arranged at the connection between each horizontal tie rod and the central column.

4. The anti-deformation welding structure for important components in large nuclear power plants according to claim 1, characterized in that, The gantry steel plate is provided with mounting holes that match the anti-deformation support frame connecting plate.

5. The anti-deformation welding structure for important components in large nuclear power plants according to claim 1, characterized in that, The internal support structure includes several tie rods that provide support from above the gantry steel plate to prevent deformation.

6. The anti-deformation welding structure for important components in large nuclear power plants according to claim 1, characterized in that, Both the anti-deformation support frame and the anti-deformation tension frame are welded and fixedly connected to the main base plate.

7. The anti-deformation welding structure for important components in large nuclear power plants according to claim 6, characterized in that, Add a C50 chamfer to the T-shaped weld leg where stress concentration is likely to occur.

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