Welding groove structure

Abstract

The utility model provides a welding groove structure which comprises a truncated edge located in the middle of the welding groove structure in the thickness direction of a weldment. The first groove is located on one side of the truncated edge and comprises a first groove edge, and a first angle is formed between the first groove edge and the thickness direction of the weldment; the second groove is located on the other side of the truncated edge and comprises a second groove edge, and a second angle is formed between the second groove edge and the thickness direction of the weldment; wherein the first angle is smaller than the second angle. According to the welding groove structure, through multiple groove combination modes, the welding workload is reduced, the welding efficiency is improved, the welding quality is guaranteed, meanwhile, a larger installation and adjustment space is provided, and the installation difficulty and the out-of-tolerance risk of a main pipeline are reduced.

Description

Technical Field

[0001] This application relates to the technical field of nuclear power pipeline installation, and particularly to a welding groove structure for weldments. Background Art

[0002] In the reactor coolant system of a nuclear power plant, the reactor coolant pipeline (hereinafter referred to as the main pipeline), as the flow path of the reactor coolant, is an extremely important pressure boundary in the primary loop reactor coolant system and a safety barrier to prevent the leakage of primary loop substances to the outside.

[0003] The main pipeline usually includes a hot section, a cold section, and a transition section, and connects the reactor pressure vessel, the steam generator, and the main pump (collectively referred to as the main equipment). The installation process of the main pipeline faces many uncertain factors, such as manufacturing dimension deviations of the main equipment, manufacturing dimension deviations of the main pipeline, on-site dimension processing deviations, the in-place state of the main equipment, installation processes, welding equipment, welding operation processes, etc. During the welding process, each weld seam usually inevitably generates welding shrinkage and deviations, bringing the risk of out-of-tolerance to the final installation dimensions of the main pipeline. The last weld seam of a single loop is particularly important, posing challenges to the installers. Summary of the Invention

[0004] The utility model provides a combined welding groove structure for the main pipeline, which can give a larger installation adjustment space while reducing the welding workload, improving the welding efficiency, and ensuring the welding quality, and reducing the installation difficulty and out-of-tolerance risk of the main pipeline.

[0005] A welding groove structure of the utility model includes: a root face, which is located in the middle of the welding groove structure along the thickness direction of the weldment; a first groove, which is located on one side of the root face, the first groove includes a first groove edge, and the first groove edge forms a first angle with the thickness direction of the weldment; a second groove, which is located on the other side of the root face, the second groove includes a second groove edge, and the second groove edge forms a second angle with the thickness direction of the weldment; wherein, the first angle is less than the second angle.

[0006] Preferably, the first groove further includes a first arc edge, one end of the first arc edge is connected to the root face, and the other end is connected to the first groove edge; the second groove further includes a second arc edge, one end of the second arc edge is connected to the root face, and the other end is connected to the second groove edge; the radius of the first arc edge is less than the radius of the second arc edge.

[0007] Preferably, the second groove further includes a third groove edge, one end of the third groove edge is connected to the second groove edge, and the other end extends to the end face of the weldment, and the third groove edge forms a third angle with the perpendicular welding direction, and the third angle is greater than the first angle and less than the second angle.

[0008] Preferably, the first groove also includes a fourth groove edge, one end of the fourth groove edge is connected to the root face, and the other end is connected to the first groove edge; the second groove also includes a second arc edge, one end of the second arc edge is connected to the root face, and the other end is connected to the second groove edge.

[0009] Preferably, the second groove also includes a third groove edge, one end of the third groove edge is connected to the second groove edge, and the other end extends to the end face of the welded part. The third groove edge forms a third angle with the perpendicular welding direction, and the third angle is greater than the first angle and less than the second angle.

[0010] Preferably, in the direction perpendicular to the thickness of the welded part, the depth of the first groove is greater than the depth of the second groove.

[0011] Preferably, the first angle is 5° ± 0.5°, and the second angle is 30° ± 2.5°.

[0012] Preferably, the radius of the first arc edge is 2 ± 0.5 mm, and the radius of the second arc edge is 5 ± 0.5 mm.

[0013] Preferably, the third angle is 10° ± 2.5°.

[0014] Preferably, the projection length of the fourth groove edge in the direction parallel to the welded part is 7 ± 0.5 mm, and the projection length in the direction perpendicular to the thickness of the welded part is 13 ± 0.5 mm.

[0015] The welding groove structure of the present utility model, through various groove combination forms, while reducing the welding workload, improving the welding efficiency, and ensuring the welding quality, provides a larger installation adjustment space, reducing the installation difficulty and out-of-tolerance risk of the main pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the embodiments of the present application will be briefly introduced below.

[0017] Figure 1 It is a schematic diagram of the welding groove structure of a specific embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of the welding groove structure of another specific embodiment of the present utility model;

[0019] Figure 3 It is a schematic diagram of the welding groove structure of another specific embodiment of the present utility model;

[0020] Figure 4 It is a schematic diagram of the welding groove structure of another specific embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0022] The main reactor coolant loop usually consists of two to four coolant loops. There is a steam generator and several reactor coolant pumps on each loop. The hot leg pipe conveys the reactor coolant from the reactor pressure vessel to the steam generator, the cold leg pipe conveys the reactor coolant from the reactor coolant pump back to the reactor pressure vessel, and the transition section conveys the reactor coolant from the steam generator to the reactor coolant pump. During the installation process of the main pipe, each loop is installed independently. During the installation of a single loop, it is required that the main pipe complete a complete connection while accommodating various deviations. Due to the relatively fixed position or local adjustment of the main equipment, high-precision requirements are put forward for the control during the installation of the main pipe single loop, that is, high requirements are put forward for the installation process design and welding process of the main pipe.

[0023] The design of the main pipe groove has an important impact on both the installation process and the welding process of the main pipe. For this reason, the present utility model provides a welding groove structure, which reduces the installation difficulty and out-of-tolerance risk of the main pipe through various groove combination forms.

[0024] Figure 1 Schematic diagram of the welding groove structure 100 of a specific embodiment of the present utility model.

[0025] As Figure 1 shown, the welding groove structure 100 of this embodiment includes a root face 1, a first groove 2 and a second groove 3. The root face 1 is located in the middle of the welding groove structure 100 along the thickness direction Y of the weldment 200; the first groove 2 is located on one side of the root face 1, and the first groove 2 includes a first groove edge 21, and the first groove edge 21 forms a first angle A with the thickness direction Y of the weldment 200; the second groove 3 is located on the other side of the root face 1, and the second groove 3 includes a second groove edge 31, and the second groove edge 31 forms a second angle H with the thickness direction Y of the weldment 200; the first angle A is less than the second angle H.

[0026] In one embodiment, the first groove 2 further includes a first arc edge 22, one end of the first arc edge 22 is connected to the root face 1, and the other end is connected to the first groove edge 21; the second groove 3 further includes a second arc edge 32, one end of the second arc edge 32 is connected to the root face 1, and the other end is connected to the second groove edge 31; the radius C of the first arc edge is less than the radius F of the second arc edge.

[0027] The root face 1 has a certain width along the length direction X of the welded part 200 and a certain thickness E along the thickness direction Y of the welded part 200. The first bevel edge 21 is connected to the first arc edge 22 and extends to one side of the root face 1, thereby forming a U-shaped first bevel 2 on one side of the root face 1; the second bevel edge 31 is connected to the second arc edge 32 and extends to the other side of the root face 1, thereby forming a U-shaped second bevel 3 on the other side of the root face 1.

[0028] Since the first angle A of the first bevel edge 21 is smaller than the second angle H of the second bevel edge 31, therefore, the first bevel 2 is called a narrow U-shaped narrow-gap bevel, the second bevel 3 is called a wide U-shaped bevel, and the welding bevel structure 100 composed of the root face 1, the first bevel 2 and the second bevel 3 is called a narrow U-shaped narrow-gap and wide U-shaped combined bevel structure.

[0029] In a specific embodiment, the first angle A is 5° ± 0.5°, the second angle H is 30° ± 2.5°, the radius C of the first arc edge is 2 ± 0.5 mm, and the radius F of the second arc edge is 5 ± 0.5 mm.

[0030] Since the radius C of the first arc edge is smaller than the radius F of the second arc edge, along the length direction X of the welded part 200, the root face 1 has a first width B on one side of the first bevel 2 and a second width G on one side of the second bevel 3. Preferably, the first width B is 2.5 ± 0.2 mm, and the second width G is 2.5 ± 0.2 mm.

[0031] Along the thickness direction Y of the welded part 200, the root face 1 is located at the middle position of the welding bevel structure 100, and the central distance D of the root face 1 relative to the center of the pipe / equipment nozzle can be specifically set according to the pipe diameter and installation process. The numerical range of the thickness E of the root face 1 can be set to 2 ± 0.2 mm, so as to ensure the butt joint of the welded part 200 with another welded part during the welding process.

[0032] In terms of the weld thickness dimension, the depth of the first bevel 2 of the narrow-gap bevel is usually greater than the depth of the second bevel 3 of the wide U-shaped bevel on the other side.

[0033] Figure 2 Schematic diagram of the welding bevel structure 300 according to another specific embodiment of the present invention.

[0034] As Figure 2As shown, in some other embodiments, the welding groove structure 300 has a first groove 2 with the same structure as the welding groove structure 100 and a second groove 3' on the other side of the root face 1; in addition to including a second groove edge 31 with the same structure as that of the welding groove structure 100, the second groove 3' further includes a third groove edge 33. One end of the third groove edge 33 is connected to the second groove edge 31, and the other end extends to the end face 201 of the welded part 200. The third groove edge 33 forms a third angle J with the thickness direction Y of the welded part 200, and the third angle J is greater than the first angle A and less than the second angle H. In a specific embodiment, the value range of the third angle J is 10° ± 2.5°.

[0035] The third groove edge 33 is connected to the second groove edge 31, and the second groove edge 31 is connected to the second arc edge 32 and extends to the root face 1, thereby forming a UV-shaped second groove 3' on the other side of the root face 1.

[0036] The second groove edge 31 is located between the third groove edge 33 and the second arc edge 32. The second groove edge 31 forms a root V-shaped structure on the side of the second groove 3' close to the root face. The second groove edge 31 has a height K along the thickness direction Y of the welded part 200, and the value range of the height K can be set at 20 ± 3 mm.

[0037] Since the third angle J is greater than the first angle A and less than the second angle H, the second groove 3' is called a wide UV-shaped groove; the welding groove structure 300 composed of the root face 1, the first groove 2, and the second groove 3' is called a narrow U-shaped narrow-gap and wide UV-shaped combined groove structure.

[0038] Figure 3 Schematic diagram of the welding groove structure 400 according to another specific embodiment of the present invention.

[0039] As Figure 3 shown, in some other embodiments, the welding groove structure 400 has a second groove 3 with the same structure as the welding groove structure 100 and a first groove 2' on the other side of the root face 1; in addition to including a first groove edge 21 with the same structure as that of the welding groove structure 100, the first groove 2' further includes a fourth groove edge 23. One end of the fourth groove edge 23 is connected to the root face 1, and the other end is connected to the first groove edge 21.

[0040] The fourth groove edge 23 is connected to the first groove edge 21, and the fourth groove edge 23 extends to the root face 1, thereby forming a double V-shaped narrow-gap first groove 2' on one side of the root face 1.

[0041] In this embodiment, the fourth bevel edge 23 has a length L along the length direction X of the welded part 200, and the value range of the length L can be set at 7 ± 0.5 mm. The fourth bevel edge 23 has a height N along the thickness direction Y of the welded part 200, and the value range of the height N can be set as 13 ± 0.5 mm. The projection of the first bevel edge 21 along the length direction X of the welded part 200 has a length M, and the value range of the length M can be specifically set according to the pipe diameter and wall thickness.

[0042] Since the cross-sectional shapes of both the fourth bevel edge 23 and the first bevel edge 21 are inclined planes, the first bevel 2' is called a double-V narrow-gap type bevel; the welding bevel structure 400 composed of the root face 1, the first bevel 2' and the second bevel 3 is called a double-V narrow-gap and wide-U combined bevel structure.

[0043] Figure 4 It is a schematic diagram of the welding bevel structure 500 of another specific embodiment of the present invention.

[0044] As Figure 4 shown, in some other embodiments, the welding bevel structure 500 has the same second bevel 3' as the welding bevel structure 300 and the same first bevel 2' as the welding bevel structure 400 on the other side of the root face 1.

[0045] The welding bevel structure 500 composed of the double-V narrow-gap type bevel of the first bevel 2' and the wide-UV type bevel of the second bevel 3' is called a double-V narrow-gap and wide-UV combined bevel structure.

[0046] Compared with the single-type main pipeline bevels such as wide-U type, wide-V type, wide-UV type, and wide double-V type, the combined nuclear power main pipeline welding bevel structures 100, 300, 400, and 500 of the present invention reduce the installation workload. Moreover, compared with the traditional manual welding bevel, the working efficiency can be improved by applying an automatic welding machine; compared with the narrow-gap single-type bevel, a larger adjustment space is given for installation, reducing the difficulty of alignment and installation.

[0047] The combined nuclear power main pipeline welding bevel structures 100, 300, 400, and 500 of the present invention can be used for any end weld structure in the installation stage of the main pipeline of the reactor coolant system in a nuclear power plant, and are also applicable to the bevel types in the installation welding processes of other pipelines and pipelines, pipelines and pipe fittings, pipelines and equipment nozzles, pipe fittings and equipment nozzles, etc.

[0048] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A welding groove structure, characterized in that, Comprising: The root face, which is located at the middle of the welded groove structure along the thickness direction of the welded part; The first groove, which is located on one side of the root face. The first groove includes a first groove edge, and the first groove edge forms a first angle with the thickness direction of the welded part; The second groove, which is located on the other side of the root face. The second groove includes a second groove edge, and the second groove edge forms a second angle with the thickness direction of the welded part; Wherein, the first angle is less than the second angle.

2. The welded groove structure according to claim 1, characterized in that The first groove further includes a first arc edge, one end of the first arc edge is connected to the root face, and the other end is connected to the first groove edge; The second groove further includes a second arc edge, one end of the second arc edge is connected to the root face, and the other end is connected to the second groove edge; The radius of the first arc edge is less than the radius of the second arc edge.

3. The welded groove structure according to claim 2, characterized in that The second groove further includes a third groove edge, one end of the third groove edge is connected to the second groove edge, and the other end extends to the end face of the welded part, The third groove edge forms a third angle with the thickness direction of the welded part, and the third angle is greater than the first angle and less than the second angle.

4. The welded groove structure according to claim 1, characterized in that The first groove further includes a fourth groove edge, one end of the fourth groove edge is connected to the root face, and the other end is connected to the first groove edge; The second groove further includes a second arc edge, one end of the second arc edge is connected to the root face, and the other end is connected to the second groove edge.

5. The welded groove structure according to claim 4, characterized in that The second groove further includes a third groove edge, one end of the third groove edge is connected to the second groove edge, and the other end extends to the end face of the welded part, The third groove edge forms a third angle with the thickness direction of the welded part, and the third angle is greater than the first angle and less than the second angle.

6. The welding groove structure according to any one of claims 1-5, characterized in that, In the thickness direction of the welded part, the depth of the first groove is greater than the depth of the second groove.

7. The welding groove structure according to any one of claims 1-5, characterized in that, The first angle is 5° ± 0.5°, and the second angle is 30° ± 2.5°.

8. The welding groove structure according to claim 2 or 3, characterized in that, The radius of the first arc edge is 2 ± 0.5 mm, and the radius of the second arc edge is 5 ± 0.5 mm.

9. The welding groove structure according to claim 3 or 5, characterized in that, The third angle is 10° ± 2.5°.

10. The welding groove structure according to claim 4 or 5, characterized in that, The length of the fourth groove edge in the length direction of the welded part is 7 ± 0.5 mm, and the length in the thickness direction of the welded part is 13 ± 0.5 mm.

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