Weld defect treatment device and method

Abstract

The present application relates to a kind of weld defect processing device and method, comprising: clamping assembly and sealing assembly.When sealing Canopy type weld between pressure shell component and pipe base using the weld defect processing device described above, adopt the weld defect processing method described above, first shell is from pressure shell component to the direction of pipe base away from pressure shell component and is set to the outside of pressure shell component, and make the space between first shell and first shaft shoulder enough.Second shell is from pipe base to the direction of pressure shell component away from pipe base and is set to the outside of pipe base, and make the space between second shell and Canopy type weld enough.Sealing assembly is placed between second shell and Canopy type weld, and sealing assembly is moved so that sealing assembly is close to Canopy type weld.Fixed first shell and second shell, so that sealing assembly and Canopy type weld abut and fixed, to seal Canopy type weld.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power maintenance, and in particular to a device and method for processing weld defects. Background Art

[0002] Currently, each nuclear power plant in operation has 65 Canopy-type lower welds (including four thermocouple welds and 61 CRDM welds). Canopy welds are cover-sealing welds typically found in the lower control area of ​​a nuclear power plant; the CRDM is the control rod drive mechanism. Because the Canopy is the primary pressure boundary, leaks directly impact the integrity of the primary circuit and can cause corrosion to the cover and its accessories, potentially impacting the safety of the reactor itself.

[0003] like Figure 3 As shown, the Canopy weld is a special-shaped weld welded between the thick tube section 222 and the tapered section 223 of the tube seat and the pressure shell component 210. This type of weld is prone to internal material leakage during the operation of the equipment. The current treatment method is the Overlay welding technology in the US nuclear field. The Overlay welding technology mainly uses a cladding process to form a weld wrap layer on the upper part of the weld defect. This wrap layer completely and independently assumes the design function of the original weld joint, and this technology allows the original defect to exist. However, this technology has disadvantages and shortcomings such as complex implementation and long construction period, and may change the original shape of the pressure boundary of the first circuit in the unit, thereby causing potential continued cracking and leakage in the heat-affected zone of the cladding. Summary of the Invention

[0004] Based on this, it is necessary to provide a weld defect treatment device and method to address the shortcomings and deficiencies of overlay welding technology, such as complex implementation and long construction period, and the possibility of changing the original form of the pressure-bearing boundary of a circuit in the unit, thereby leading to potential continued cracking and leakage in the heat-affected zone of the overlay welding.

[0005] An embodiment of the present application provides a weld defect treatment device for sealing a Canopy-type weld between a pressure-resistant shell component and a pipe seat of a pipeline. The weld defect treatment device includes a clamping assembly and a sealing assembly;

[0006] The clamping assembly includes a first shell and a second shell, the first shell having a first through hole formed along the axial direction of the pipe, the second shell having a second through hole formed along the axial direction of the pipe, the pipe formed by connecting the pipe seat and the pressure-resistant shell component passing through the first through hole and the second through hole, the inner wall of the first through hole being used to abut against the pressure-resistant shell component, and the first shell and the second shell being spaced apart and fixedly connected;

[0007] The sealing assembly is located between the inner wall of the second through hole and the Canopy type weld, and abuts against the Canopy type weld to seal the Canopy type weld.

[0008] The clamping assembly includes a first shell and a second shell, and the first shell and the second shell are arranged at intervals. The first shell is provided with a first through hole along the axial direction of the tube seat, and the second shell is provided with a second through hole along the axial direction of the tube seat, so that the first shell is sleeved on the outside of the pressure-resistant shell component from the direction away from the tube seat through the first through hole, and the second shell is sleeved on the outside of the tube seat from the direction away from the pressure-resistant shell component through the second through hole, so that the pipeline formed after the tube seat and the pressure-resistant shell component are connected is passed through the first through hole and the second through hole.

[0009] The sealing assembly is located between the inner wall of the second through hole and the Canopy type weld, and abuts against the Canopy type weld to seal the Canopy type weld. At the same time, the pressure-resistant shell component abuts against the inner wall of the first through hole, and the first shell and the second shell are fixedly connected. Therefore, the sealing assembly can be placed between the second shell and the Canopy type weld, the pressure-resistant shell component abuts against the second shell, and then the first shell and the second shell are fixedly connected, so that the clamping assembly composed of the first shell and the second shell and the sealing assembly located between the second shell and the Canopy type weld can be sealed and welded with a complex pipeline structure and morphology through a clamping process without changing the pipeline structure at the Canopy type weld.

[0010] In one embodiment, the first shell is provided with a plurality of fastening through holes parallel to the axial direction of the tube seat, the second shell is provided with fastening holes corresponding one-to-one to the plurality of fastening through holes, and the plurality of fasteners are correspondingly passed through the fastening through holes and the fastening holes.

[0011] In one embodiment, a first annular boss is provided at one end of the first shell facing away from the second shell and close to the pressure-resistant shell component in the radial direction of the pressure-resistant shell component. The first annular boss and the inner wall of the first through hole are respectively used to abut against the sealing assembly.

[0012] A second annular boss is provided at one end of the second shell away from the first shell and close to the tube seat in the radial direction of the tube seat. The second annular boss and the inner wall of the second through hole respectively abut against the sealing assembly.

[0013] In one embodiment, the sealing assembly includes a sealing tray and a sealing ring, wherein the sealing tray is located between the sealing ring and the second shell, and the sealing ring is located between the Canopy weld of the tube seat and the sealing tray.

[0014] In an embodiment, the sealing tray is annular, and a third annular boss is arranged on the sealing tray at an end of the sealing tray away from the first shell and close to the tube base in a radial direction of the tube base, and the sealing ring is in abutment with the third annular boss and the inner wall of the sealing tray.

[0015] In an embodiment, the sealing ring is provided with a sealing protruding ring in abutment with the Canopy type weld in a radial direction of the tube base.

[0016] In an embodiment, the sealing tray comprises two open and opposite tray half-rings, and the sealing ring comprises two open and opposite sealing half-rings.

[0017] In an embodiment, the sealing ring is a graphite sealing ring.

[0018] In an embodiment, the weld defect processing device further comprises a plurality of disc springs, and each of the plurality of fasteners is arranged through one of the plurality of disc springs and clamps the disc spring between the fastener and the first shell.

[0019] An embodiment of the present application further provides a weld defect processing method for sealing a Canopy type weld between a pressure-resistant shell component and a tube base by using the weld defect processing device, and the weld defect processing method comprises the following steps:

[0020] Sleeving the first shell outside the pressure-resistant shell component from an end of the pressure-resistant shell component away from the tube base to an end of the pressure-resistant shell component close to the tube base;

[0021] Sleeving the second shell outside the tube base from an end of the tube base away from the pressure-resistant shell component to an end of the tube base close to the pressure-resistant shell component;

[0022] Placing the sealing assembly between the second shell and the Canopy type weld;

[0023] Fixing the first shell and the second shell to make the sealing assembly in abutment with the Canopy type weld to seal the Canopy type weld.

[0024] When using a weld defect treatment device to seal the Canopy weld between a pressure-resistant shell component and a tube seat, the weld defect treatment method described above is employed. The first shell is positioned outside the pressure-resistant shell component, away from the tube seat, leaving a certain amount of space between the first shell and the first shoulder. The second shell is positioned outside the tube seat, away from the pressure-resistant shell component, leaving sufficient space between the second shell and the Canopy weld. A sealing assembly is placed between the second shell and the Canopy weld, and the sealing assembly is moved so that it is in close contact with the Canopy weld. The first and second shells are secured so that the sealing assembly abuts and secures the Canopy weld, thereby sealing the Canopy weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a weld defect treatment device according to an embodiment;

[0026] Figure 2 A schematic diagram of the structure of a weld defect treatment device according to another embodiment;

[0027] Figure 3 A cross-sectional view of a Canopy-type weld sealed by a weld defect treatment device according to one embodiment;

[0028] Figure 4 for Figure 2 Schematic diagram of the structure of the middle tray half ring.

[0029] Figure Number:

[0030] 100-Weld defect treatment device;

[0031] 110-clamping assembly; 111-first housing; 112-second housing; 113-first through hole; 114-second through hole; 115-fastening through hole; 116-fastening hole; 117-first annular boss; 118-second annular boss; 1191-accommodating groove; 1192-annular groove;

[0032] 120 - sealing assembly; 121 - sealing tray; 122 - sealing ring; 123 - third annular boss; 124 - sealing convex ring; 125 - tray semicircular ring; 126 - sealing semicircular ring; 127 - operation hole;

[0033] 130-fastener; 131-disc spring;

[0034] 210-pressure shell component; 211-first shaft shoulder;

[0035] 220-tube seat; 221-thin tube section; 222-thick tube section; 223-tapered section;

[0036] 230-Canopy type weld. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0040] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0043] In the prior art, the structure of the pipeline with the Canopy type weld 230 is generally as follows: Figure 3 As shown, it includes a pressure-resistant shell component 210 and a tube base 220 connected in the axial direction. Tube base 220 includes a thin tube section 221, a thick tube section 222, and a tapered section 223. The thick tube section 222 and the thin tube section 221 are connected by the tapered section 223. The outer diameter of the thick tube section 222 is larger than the outer diameter of the thin tube section 221. The outer diameter of the tapered section 223 is gradually changing, providing a transition between the thick tube section 222 and the thin tube section 221.

[0044] The pressure-resistant shell component 210 is sleeved over the thick tube section 222. One end of the pressure-resistant shell component 210 is welded to the junction between the thick tube section 222 and the tapered section 223, forming a canopy weld 230 at this weld. Because the canopy weld 230 is located at the junction of the thick tube section 222 and the tapered section 223 (where the tube diameter changes), and is welded around this junction, it forms an annular, contoured weld. The thin tube section 221 extends outside the pressure-resistant shell component 210. Furthermore, the pressure-resistant shell component 210 also has a first shoulder 211 on its exterior.

[0045] Since the Canopy-type weld 230 with an annular special-shaped surface is located at the connection between the thick pipe section 222 and the tapered section 223, and the weld is obtained by welding the pressure-resistant shell component 210 and the tube seat 220 that are sleeved on the thick pipe section 222 of the tube seat 220, whether it is due to the structure of the weld or the pipeline structure formed by the pressure-resistant shell component 210 and the tube seat 220 near the weld, or the change in the shape of the tube seat 220 near the weld, and also because the outer periphery of the end of the pressure-resistant shell component 210 away from the tube seat 220 has a first axial shoulder 211, the difficulty of using a clamp structure to seal and weld the Canopy-type weld 230 is greatly increased.

[0046] Based on this, please refer to Figure 1 、 Figure 2 as well as Figure 3 An embodiment of the present invention provides a weld defect treatment device 100 for sealing a Canopy-type weld 230 between a pressure-resistant shell component 210 and a pipe seat 220 of a pipeline. The weld defect treatment device 100 includes a clamping assembly 110 and a sealing assembly 120.

[0047] The clamping assembly 110 includes a first shell 111 and a second shell 112. The first shell 111 and the second shell 112 are spaced apart. The first shell 111 is provided with a first through hole 113 extending along the axial direction of the pipe, and the second shell 112 is provided with a second through hole 114 extending along the axial direction of the pipe, so that the first shell 111 is sleeved on the outside of the pressure-resistant shell component 210 from the pressure-resistant shell component 210 away from the pipe seat 220 through the first through hole 113, and the second shell 112 is sleeved on the outside of the pipe seat 220 from the pipe seat 210 away from the pressure-resistant shell component 210 through the second through hole 114, so that the pipe formed after the pipe seat 220 and the pressure-resistant shell component 210 are connected is passed through the first through hole 113 and the second through hole 114.

[0048] The sealing assembly 120 is located between the inner wall of the second through hole 114 and the Canopy weld 230, and abuts against the Canopy weld 230 to seal the Canopy weld 230. At the same time, the inner wall of the first through hole 113 abuts against the pressure-resistant shell component 210, and the first shell 111 and the second shell 112 are fixedly connected. Therefore, the sealing assembly 120 can be placed between the second shell 112 and the Canopy weld 230, the pressure-resistant shell component 210 abuts against the second shell 112, and then the first shell 111 and the second shell 112 are fixedly connected, so that the clamping assembly 110 composed of the first shell 111 and the second shell 112 and the sealing assembly 120 located between the second shell 112 and the Canopy weld 230 can be sealed and welded through the weld defect processing device 100 without changing the pipeline structure at the Canopy weld 230.

[0049] Please refer to Figure 1 and Figure 3 Specifically, the specific contours and shapes of the first shell 111 and the second shell 112 can be cut and changed according to the installation structure of the tube seat 220 and the pressure-resistant shell component 210 to avoid the main structure and accessories of the tube seat 220 and the pressure-resistant shell component 210.

[0050] Please refer to Figure 1 and Figure 3 In one embodiment, the first shell 111 is provided with a plurality of fastening through holes 115 extending in an axial direction parallel to the tube seat 220, and the second shell 112 is provided with fastening holes 116 corresponding one-to-one to the plurality of fastening through holes 115. A plurality of fasteners 130 are respectively passed through the fastening through holes 115 and the fastening holes 116, so that the first shell 111 and the second shell 112 can be fixedly connected by the plurality of fasteners 130. When maintenance is required, the fasteners 130 can be removed to release the first shell 111 and the second shell 112, thereby exposing the Canopy-type weld 230 that needs to be repaired, which is convenient for maintenance.

[0051] like Figure 3As shown, a first shoulder 211 is provided on the outside of the pressure-resistant shell component 210 in a direction away from the pipe seat 220. In one embodiment, a first annular boss 117 is provided near the pressure-resistant shell component 210 along the radial direction of the pressure-resistant shell component 210 at one end of the first shell 111 away from the second shell 112. The first annular boss 117 and the inner wall of the first through hole 113 are respectively used to abut against the first shoulder 211 of the pressure-resistant shell component 210, so that the first annular boss 117 can apply pressure to the first shoulder 211 along the axis of the pressure-resistant shell component 210 in a direction close to the second shell 112. At one end of the second shell 112 facing away from the first shell 111, a second annular boss 118 is provided radially adjacent to the tube seat 220. The second annular boss 118 and the inner wall of the second through hole 114 respectively abut against the sealing assembly 120, thereby enabling the second annular boss 118 to apply pressure to the sealing assembly 120 in a direction in which the axis of the pressure-resistant shell component 210 approaches the first shell 111, thereby enabling the sealing assembly 120 to apply force to the canopy weld 230 in a direction in which the axis of the pressure-resistant shell component 210 approaches the first shell 111. By rotating the fastener 130 provided through the fastening through hole 115 and the fastening hole 116, the first annular boss 117 is fixed and stationary relative to the first shaft shoulder 211. The second shell 112 approaches the first shell 111 along the axial direction of the pressure-resistant shell component 210 or tends to approach the first shell 111, so that the second annular boss 118 can apply pressure to the sealing assembly 120 in the direction of approaching the first shell 111 along the axis of the pressure-resistant shell component 210, so that the sealing assembly 120 can apply force to the Canopy-type weld 230 in the direction of approaching the first shell 111 along the axis of the pressure-resistant shell component 210, so that the sealing assembly 120 can abut the Canopy-type weld 230 more closely to seal the Canopy-type weld 230.

[0052] The surface where the first annular boss 117 abuts against the first shoulder 211 is an inner wall of the first through hole 113 , and the surface where the second annular boss 118 abuts against the sealing assembly 120 is an inner wall of the second through hole 114 .

[0053] Please refer to Figure 1 and Figure 3In one embodiment, the sealing assembly 120 includes a sealing tray 121 and a sealing ring 122. The sealing tray 121 is located between the sealing ring 122 and the second shell 112. The sealing ring 122 is located between the Canopy-type weld 230 of the tube seat 220 and the sealing tray 121. Since the sealing ring 122 needs to be moved radially toward the tube seat 220 to seal the Canopy-type weld 230, If the second shell 112 directly abuts the sealing ring 122, there is no space to move the sealing ring 122 radially along the tube seat 220 during installation, so that the sealing ring 122 cannot be abutted against the Canopy-type weld 230. Therefore, a sealing tray 121 is provided, and the sealing tray 121 is operated to move one end close to the first shell 111 radially along the tube seat 220, thereby pushing the sealing ring 122 located between the Canopy-type weld 230 and the sealing tray 121 to move radially along the tube seat 220, so that the sealing ring 122 is tightly abutted against the Canopy-type weld 230 to seal the Canopy-type weld 230.

[0054] Please refer to Figure 1 、 Figure 3 as well as Figure 4 In one embodiment, the sealing tray 121 is annular, and a third annular boss 123 is provided on the end of the sealing tray 121 away from the first shell 111 and close to the tube seat 220 along the radial direction of the tube seat 220. The sealing ring 122 abuts against the third annular boss 123 and the inner wall of the sealing tray 121 at the same time, so that the sealing tray 121 can abut against the second annular boss 118, and the sealing ring 122 abuts against the third annular boss 123. As a result, when the second shell 112 approaches the first shell 111 along the axial direction of the tube seat 220, the sealing tray 121 is driven to approach the first shell 111 along the axial direction of the tube seat 220, and then the sealing ring 122 is driven to approach the first shell 111 along the axial direction of the tube seat 220, so that the sealing ring 122 is abutted and sealed against the Canopy type weld 230 along the axial direction of the tube seat 220, and the sealing ring 122 is abutted and sealed against the Canopy type weld 230 along the radial direction of the tube seat 220, so that the sealing ring 122 is tightly abutted and sealed against the Canopy type weld 230.

[0055] Please refer to Figure 1 Figure 3 and Figure 4In one embodiment, an operating hole 127 is opened on the end surface of the sealing tray 121 close to the first shell 111. After the movable tool (not shown) is connected to the sealing tray 121 through the operating hole 127, the movable tool can be held to drive the end of the sealing tray 121 close to the first shell 111 to move radially along the tube seat 220, thereby pushing the sealing ring 122 located between the Canopy type weld 230 and the sealing tray 121 to move radially along the tube seat 220, so that the sealing ring 122 is tightly abutted against the Canopy type to seal the Canopy type weld 230.

[0056] Please refer to Figure 1 、 Figure 3 as well as Figure 4 In one embodiment, the sealing ring 122 is provided with a sealing convex ring 124 along the radial direction of the tube seat 220, and the inner wall thereof abuts against the Canopy type weld 230, so that the sealing ring 122 abuts and seals against the Canopy type weld 230 along the axial direction of the tube seat 220, and also abuts and seals against the Canopy type weld 230 along the radial direction of the tube seat 220, so that the sealing ring 122 tightly abuts and seals the Canopy type weld 230.

[0057] Please refer to Figure 1 and Figure 4 In one embodiment, the sealing tray 121 includes two tray semi-circular rings 125 with openings facing each other, and the sealing ring 122 includes two sealing semi-circular rings 126 with openings facing each other, so that the two tray semi-circular rings 125 and the two sealing semi-circular rings 126 can be placed in sequence between the second shell 112 and the Canopy-type weld 230, respectively, which facilitates the placement of the sealing tray 121 and the sealing ring 122.

[0058] In other embodiments, the sealing ring and the sealing tray can be cut into circular shapes according to actual conditions to form two tray semi-circular rings 125 and two sealing semi-circular rings 126 respectively.

[0059] In one embodiment, the sealing ring 122 is a graphite sealing ring 122 , so that the Canopy weld 230 can be sealed by a clamp structure using graphite material with good resilience in a radioactive environment.

[0060] Please refer to Figure 1 and Figure 3 In one embodiment, the weld defect processing device 100 also includes a plurality of disc springs 131, and a plurality of fasteners 130 are respectively passed through the plurality of disc springs 131, and the disc springs 131 are clamped between the fasteners 130 and the first shell 111, so that the fasteners 130 can better meet the sealing requirements for the pressure of the first shell 111.

[0061] Among them, the disc spring 131 is a disc spring washer.

[0062] Please refer to Figure 1 In one embodiment, each fastening through hole 115 of the first shell 111 is provided with a receiving groove 1191 recessed toward the second shell 112 at one end away from the second shell 112, and forms a stepped through hole with the corresponding fastening through hole 115, and the fastener 130 is a bolt, and the head of the fastener 130 and the disc spring 131 are located in the corresponding receiving groove 1191.

[0063] Please refer to Figure 2 In another embodiment, an annular groove 1192 recessed toward the second shell 112 is formed at the first shell 111 and at one end away from the second shell 112 , the fastener 130 is a bolt, and the head of the fastener 130 and the disc spring 131 are located in the annular groove 1192 .

[0064] Please refer to Figure 1 and Figure 3 An embodiment of the present application further provides a method for treating weld defects, using a weld defect treatment device 100 to seal a Canopy weld 230 between a pressure hull component 210 and a pipe seat 220. The weld defect treatment method includes the following steps:

[0065] S100 : The first shell 111 is sleeved onto the outside of the pressure-resistant shell 210 from one end of the pressure-resistant shell 210 away from the tube seat 220 toward the end close to the tube seat 220 .

[0066] S100 : The second shell 112 is sleeved onto the outside of the tube base 220 from one end of the tube base 220 away from the pressure-resistant shell component 210 toward the direction close to the pressure-resistant shell component 210 .

[0067] S100 : placing the sealing assembly 120 between the second housing 112 and the Canopy weld 230 .

[0068] S100 : Fixing the first shell 111 and the second shell 112 so that the sealing assembly 120 abuts against the Canopy weld 230 to seal the Canopy weld 230 .

[0069] Please refer to Figure 1 and Figure 2 Different models of weld defect processing devices 100 are used. Before using the weld defect processing device 100 to seal the Canopy type weld 230 between the pressure-resistant shell component 210 and the pipe seat 220, it is necessary to determine the type of pipeline in which the Canopy type weld 230 is located to select different models of weld defect processing devices 100.

[0070] Specifically, Figure 1 It is the Canopy type weld defect treatment device at the bottom of CRDM. Figure 2The application discloses a device for treating Canopy type weld defects in the lower part of a thermocouple column.

[0071] When the Canopy type weld 230 between the pressure shell component 210 and the tube base 220 is sealed by using the weld defect treatment device 100, the first shell 111 is sleeved outside the pressure shell component 210 from the direction away from the tube base 220, and a certain space is left between the first shell 111 and the first shaft shoulder 211 by using the above-mentioned weld defect treatment method. The second shell 112 is sleeved outside the tube base 220 from the direction away from the pressure shell component 210, and a certain space is left between the second shell 112 and the Canopy type weld 230. The sealing assembly 120 is placed between the second shell 112 and the Canopy type weld 230, and the sealing assembly 120 is moved to tightly abut the Canopy type weld 230. The first shell 111 and the second shell 112 are fixed, so that the sealing assembly 120 abuts and fixes the Canopy type weld 230, thereby sealing the Canopy type weld 230.

[0072] Before the first shell 111 and the second shell 112 are respectively sleeved outside the pressure shell component 210 and the tube base 220, a special tool (not shown in the figure) of the weld defect treatment device 100 can be installed on a hoisting device, and the first shell 111 and the second shell 112 are moved or hoisted by using the special tool.

[0073] In an embodiment, the operation hole 127 is arranged at one end of the sealing tray 121 close to the first shell 111. After the sealing assembly 120 is placed between the second shell 112 and the Canopy type weld 230, a moving tool is connected with the sealing tray 121 through the operation hole 127, the sealing tray 121 is moved along the radial direction of the tube base 220 by using the moving tool, so that the sealing ring 122 between the Canopy type weld 230 and the sealing tray 121 is moved along the radial direction of the tube base 220, and the sealing ring 122 tightly abuts the Canopy type weld 230, thereby sealing the Canopy type weld 230.

[0074] Lift the second housing 112. The second annular boss 118 drives the sealing tray 121 toward the first housing 111. The third annular boss 123 drives the sealing ring 122 toward the first housing 111, ensuring that the sealing ring 122 is in close contact with the canopy weld 230. Then, install half the number of fasteners 130 and disc spring washers symmetrically around the axis of the tube base 220 on the first housing 111. Apply anti-seize compound to the threads of the fasteners 130. After slowly lowering the first housing 111, along with the attached fasteners 130 and disc springs 131, onto the shoulder mating surface of the tube base 220, screw the fasteners 130 onto the second housing 112 until the disc springs 131 press against the first housing 111. Install the remaining half of the fasteners 130 and disc springs, and apply anti-seize compound to the threads of the fasteners 130. All fasteners 130 are tightened in multiple rounds to ensure balanced circumferential loading at the connection between the pipe base 220 and the pressure hull component 210 .

[0075] In one embodiment, the fastener 130 is a bolt.

[0076] In other embodiments, the fastener 130 may also be a combination of a double-headed screw and a nut.

[0077] Preferably, the number of fasteners 130 is an even number.

[0078] In one embodiment, there are 16 fasteners 130 , but other numbers are also possible.

[0079] Specifically, each fastener 130 is equipped with at least one disc spring 131 , and the convex surface of the disc spring 131 faces upward when the disc spring 131 is installed.

[0080] Preferably, each fastener 130 is equipped with 6 disc springs 131.

[0081] When installing the sealing tray 121, the two tray semi-circular rings 125 are respectively placed between the second shell 112 and the tube seat 220, and the sealing semi-circular rings 126 are respectively installed in the corresponding tray semi-circular rings 125, and it should be ensured that the joints of the graphite sealing semi-circular rings 126 are staggered with the leakage points of the Canopy welds, so that the convex surface of the complete sealing convex ring 124 is tightly abutted against the leakage points of the Canopy welds to seal the leakage points of the Canopy welds.

[0082] In one embodiment, the dedicated tool for installing the weld defect treatment device 100 on the lifting equipment includes a mounting member (not shown), wherein the mounting member can be a bolt or a screw. The mounting member is inserted into the fastening through hole 115 and the fastening hole 116 and engages with the threaded holes of the fastening through hole 115 and the fastening hole 116. The thread length of the mounting member reaches the bottom of the fastening hole 116. The mounting member is evenly distributed in the multiple fastening holes 116 to ensure that the subsequent mounting member exerts balanced pressure on the first shell 111 and the second shell 112.

[0083] The number of the mounting components is less than the number of the fasteners 130 .

[0084] Preferably, the number of mounting members is half the number of fasteners 130 .

[0085] In one embodiment, the special tool further comprises a hydraulic system (not shown), which is used to fasten the mounting member to the fastening through-hole 115 and the fastening hole 116. When the loading pressure of the hydraulic system is increased to 25 kN, the hydraulic system is checked for leaks and the bolts engaging the mounting member with the fastening hole 116 are checked for tightening. The pressure of the hydraulic system is continuously increased until the loading of the hydraulic system reaches 320 kN ± 5 kN, at which point the pressure is maintained for 30 seconds, and the pressure of the hydraulic system is slowly released. The pressure of the hydraulic system is increased again until the loading of the hydraulic system reaches 320 kN ± 5 kN, at which point the pressure is maintained for 30 seconds, and the pressure of the hydraulic system is slowly released. The pressure of the hydraulic system is increased again until the loading of the hydraulic system reaches 320 kN ± 5 kN, at which point the pressure is maintained for 30 seconds, and the pressure of the hydraulic system is slowly released. The pressure of the hydraulic system is increased again until the loading of the hydraulic system reaches 320 kN ± 5 kN, at which point the pressure of the hydraulic system is maintained. A corresponding number of fasteners 130 are correspondingly installed and symmetrically tightened on the fastening through-hole 115 and the fastening hole 116 where the mounting member is not installed, with a tightening torque of 40 N·m, and the pressure of the hydraulic system of the special tool is then released.

[0086] Specifically, there are 16 fasteners 130 and 8 mounting members.

[0087] All mounting parts are removed from the first shell 111 and the second shell 112 , and a corresponding number of fasteners 130 and disc springs 131 are installed one by one on the fastening holes 116 where no fasteners 130 are installed, and anti-seize agent is applied to the bolt threads.

[0088] All the fasteners 130 are symmetrically tightened in rounds to ensure balanced loading between the first shell 111 and the second shell 112 , with the final tightening torque reaching 95 N·m to 108 N·m.

[0089] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A weld defect treatment device for sealing the Canopy type weld between the pressure hull component and the pipe seat of a pipeline, characterized in that: The weld defect treatment device comprises: a clamping assembly, a sealing assembly and a plurality of fasteners; The clamping assembly includes a first shell and a second shell, the first shell having a first through hole formed along the axial direction of the pipe, the second shell having a second through hole formed along the axial direction of the pipe, the pipe passing through the first through hole and the second through hole, the inner wall of the first through hole being used to abut against the pressure shell component, the first shell and the second shell being spaced apart and fixedly connected; The sealing assembly is located between the inner wall of the second through hole and the Canopy type weld, and abuts against the Canopy type weld.

2. The weld defect treatment device according to claim 1, characterized in that: The first shell is provided with a plurality of fastening through holes parallel to the axial direction of the tube seat, the second shell is provided with fastening holes corresponding to the plurality of fastening through holes, and the plurality of fasteners are passed through the fastening through holes and the fastening holes in a one-to-one correspondence.

3. The weld defect treatment device according to claim 2, characterized in that: A first annular boss is provided at one end of the first shell facing away from the second shell, close to the pressure shell component along the radial direction of the pressure shell component, and the first annular boss and the inner wall of the first through hole are respectively used to abut against the first shoulder of the pressure shell component; A second annular boss is provided at one end of the second shell away from the first shell and close to the tube seat in the radial direction of the tube seat. The second annular boss and the inner wall of the second through hole respectively abut against the sealing assembly.

4. The weld defect treatment device according to claim 3, characterized in that: The sealing assembly includes a sealing tray and a sealing ring. The sealing tray is located between the sealing ring and the second shell. The sealing ring is located between the Canopy-type weld of the tube seat and the sealing tray.

5. The weld defect treatment device according to claim 4, characterized in that: The sealing tray is annular, and a third annular boss is provided at one end of the sealing tray away from the first shell and close to the tube seat along the radial direction of the tube seat. The sealing ring abuts against the third annular boss and the inner wall of the sealing tray at the same time.

6. The weld defect treatment device according to claim 5, characterized in that: The sealing ring is provided with a sealing convex ring along the radial direction of the tube seat, the inner wall of which abuts against the Canopy type weld.

7. The weld defect treatment device according to claim 4, characterized in that: The sealing tray comprises two tray semi-circular rings with openings facing each other, and the sealing ring comprises two sealing semi-circular rings with openings facing each other.

8. The weld defect treatment device according to claim 4, characterized in that: The sealing ring is a graphite sealing ring.

9. The weld defect treatment device according to claim 2, characterized in that: The weld defect processing device further includes a plurality of disc springs, and the plurality of fasteners are passed through the plurality of disc springs in a one-to-one correspondence, and the disc springs are clamped between the fasteners and the first shell.

10. A method for treating weld defects, using the weld defect treatment device according to any one of claims 1 to 9 to seal the Canopy weld between the pressure hull component and the pipe seat, characterized in that: The weld defect treatment method comprises the following steps: Sleeve the first shell onto the outside of the pressure-resistant shell component from one end of the pressure-resistant shell component away from the tube seat toward the direction close to the tube seat; Sleeve the second shell onto the outside of the pipe base from one end of the pipe base away from the pressure-resistant shell component toward the pressure-resistant shell component; placing a seal assembly between the second housing and the Canopy weld; The first shell and the second shell are fixed so that the sealing assembly abuts the Canopy weld to seal the Canopy weld.

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