CN217045273U - Device for maintaining fillet weld surfacing layer of nuclear power station - Google Patents
Device for maintaining fillet weld surfacing layer of nuclear power station Download PDFInfo
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- CN217045273U CN217045273U CN202123014398.9U CN202123014398U CN217045273U CN 217045273 U CN217045273 U CN 217045273U CN 202123014398 U CN202123014398 U CN 202123014398U CN 217045273 U CN217045273 U CN 217045273U
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Abstract
The utility model belongs to the technical field of the nuclear power station pipeline overhauls, concretely relates to a device that is used for maintenance of nuclear power station fillet weld surfacing layer, the device includes: the process liner and the plug can prevent constructors from being directly exposed to radioactive media, have a shielding effect on radiation and effectively reduce the irradiation dose of the constructors; foreign matters can be effectively prevented from entering the main pipeline, the pipeline is prevented from being washed again, and the working procedures are simplified.
Description
Technical Field
The application belongs to the technical field of nuclear power station pipeline maintenance, and particularly relates to a device for maintaining a fillet weld overlaying layer of a nuclear power station.
Background
In order to fully utilize the special performance of metal, make good use of the advantages and the disadvantages, save rare precious metal and reduce the manufacturing cost, a main pipeline and a nuclear safety special system of a certain nuclear power station unit adopt alloy steel pipelines, branch pipelines adopt stainless steel materials, and the main pipeline and the branch pipelines are connected by stainless steel connecting pipe seats. The welding line between the stainless steel pipe socket and the alloy steel pipeline is welded by dissimilar steel, the dissimilar steel welding line relates to more than two different materials, and the dissimilar steel welding line is easy to generate defects due to the large difference of chemical components, metallographic structures and performances. And the pipeline medium generating defects is radioactive liquid, so that the problems of large radioactive dosage, foreign matter prevention and low repair welding quality exist in the repair process under the condition that the overlaying layer or the welding seam has defects.
In order to reduce the welding difficulty of dissimilar steel and improve the quality of welding seams, nickel-based materials and stainless steel materials are generally pre-welded on a main pipeline at present, so that the dissimilar steel welding seams are converted into the stainless steel welding seams, and the field construction difficulty is reduced. The conventional solution of the defect condition of the overlaying layer or the welding seam is as follows: and cutting off the pipe connecting seat, polishing to remove defects, and then recovering welding. Therefore, constructors are directly exposed under radioactive media, the irradiated dose is large, foreign matters easily enter the pipeline, the pipeline needs to be washed again, the quality qualified rate of the root of a welding seam is low, the requirement on the skill of a welder is high, and the maintenance period is greatly prolonged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a device for maintenance of nuclear power station fillet weld surfacing layer solves and has had the problem that the radioactive dose is big, prevent the foreign matter and maintain welding quality is not high under the defect circumstances in surfacing layer or welding seam, exists during the maintenance, can reduce the irradiated dose, avoid the pipeline to get into the foreign matter, and the requirement is low to the welder skill to can improve the welding seam qualification rate by a wide margin.
The technical scheme for realizing the purpose of the application is as follows:
the embodiment of the application provides a device that is used for maintenance of nuclear power station fillet weld build-up welding layer, the device includes: process liners and stoppers;
the process gasket is arranged at an opening of a main pipeline and used for arcing and arc extinguishing on the process gasket when a surfacing layer of the main pipeline is maintained;
the plug is arranged in the main pipeline and positioned below the process liner and used for plugging the main pipeline when the surfacing layer of the main pipeline is repaired;
and the upper surface and/or the lower surface of the plug is/are provided with a radiation-proof coating.
Alternatively to this, the first and second parts may,
the plug is of a cylindrical structure and the diameter of the plug is not larger than the inner diameter of the main pipeline;
the stopper, comprising: the plug core comprises an upper sealing plate, a lower sealing plate and a plug core fixed between the upper sealing plate and the lower sealing plate;
the upper surface of the upper sealing plate is provided with an upper sealing plate radiation coating;
the lower surface of the lower sealing plate is provided with a lower sealing plate radiation-emitting coating.
In the alternative,
the upper sealing plate radiation-emitting coating and the lower sealing plate radiation-emitting coating are both made of lead-containing materials.
Optionally, the plug further includes: a control lever;
the plug core is made of a flexible material that can be stretched and compressed;
the control rod is used for controlling the stretching and the compression of the plug core.
Alternatively to this, the first and second parts may,
the plug is provided with a hole which penetrates through the upper sealing plate to place the radiation coating, the upper sealing plate, the plug core and the lower sealing plate;
a boss is arranged in a hole of the lower sealing plate, and one end of the control rod extends into the hole and is clamped at the boss;
the hole of the upper sealing plate and the control rod are provided with mutually matched threads so as to enable the upper sealing plate to move up and down along the control rod;
the other end of the control rod extends out of the hole.
Alternatively to this, the first and second parts may,
the process liner is of a cylindrical structure with a wide upper part and a narrow lower part, and the diameter of the upper end of the process liner is not larger than the inner diameter of the main pipeline;
the process liner is characterized in that a mounting through hole is formed in the process liner, threads are formed in the mounting through hole and used for mounting a clamping bolt, and the process liner is placed in the main pipeline through the clamping bolt.
In the alternative,
the upper end of the process liner is arranged at the opening of the main pipeline in a spot welding mode.
The beneficial technical effect of this application lies in:
(1) the embodiment of the application provides a device for maintaining a fillet weld overlaying layer of a nuclear power station, which can prevent constructors from being directly exposed to radioactive media, has a shielding effect on radiation, and can effectively reduce the irradiation dose of the constructors; foreign matters can be effectively prevented from entering the main pipeline, the pipeline is prevented from being washed again, and the process is simplified.
(2) The embodiment of the application provides a device for maintenance of nuclear power station fillet weld surfacing layer can adjust the diameter of stopper, can realize the quick installation of device to can avoid droing, save the engineering time.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for weld overlay repair of a fillet weld of a nuclear power plant according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a plug of an apparatus for repairing a weld overlay of a fillet weld in a nuclear power plant according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a process pad of an apparatus for weld overlay repair of a fillet weld in a nuclear power plant according to an embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a method for weld overlay repair of a fillet weld of a nuclear power plant according to an exemplary embodiment of the present disclosure;
FIG. 5 is a schematic illustration of an operating condition of a method for weld overlay repair of a fillet weld of a nuclear power plant according to an embodiment of the present disclosure;
FIG. 6 is a schematic illustration of another operational state of a method for weld overlay repair of a fillet weld in a nuclear power plant according to an exemplary embodiment of the present disclosure;
FIG. 7 is a schematic illustration of another operational state of a method for weld overlay repair of a fillet weld in a nuclear power plant according to an exemplary embodiment of the present disclosure;
FIG. 8 is a schematic illustration of another operational state of a method for weld overlay repair of a fillet weld in a nuclear power plant according to an exemplary embodiment of the present disclosure;
FIG. 9 is a schematic illustration of another operational state of a method for weld overlay repair of a fillet weld of a nuclear power plant according to an exemplary embodiment of the present disclosure;
FIG. 10 is a schematic view of another operational state of a method for weld overlay repair of a fillet weld in a nuclear power plant according to an exemplary embodiment of the present disclosure.
In the figure:
1-technological liner; 11-mounting through holes; 12-a clamping bolt;
2-a plug; 21-upper closing plate; 22-lower closing plate; 23-a plug core; 24-placing a radiation coating on the upper sealing plate; 25-placing a radiation coating on the lower sealing plate; 26-a control lever; 27-holes; 28-boss;
3-a main pipeline;
41-a connecting pipe seat; 42-new nozzle; 43-positioning rods; 44-V shaped holes; 45-boss;
51-a weld overlay; 52-New weld overlay.
Detailed Description
In order to make the technical solutions in the embodiments of the present application more comprehensible to those skilled in the art, the following description will be made in detail and completely with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the embodiments described below are only some of the embodiments of the present application, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments described herein without inventive step, are within the scope of the present application.
Referring to fig. 1, the drawing is a schematic structural diagram of an apparatus for repairing a fillet weld overlay of a nuclear power plant according to an embodiment of the present disclosure.
The device that is used for maintenance of nuclear power station fillet weld surfacing layer that this application embodiment provided includes: a technical liner 1 and a plug 2;
the process pad 1 is arranged at an opening of the main pipeline 3 and is used for arcing and arc quenching on the process pad 3 when the surfacing layer of the main pipeline 3 is maintained;
the plug 2 is arranged in the main pipeline 3 and is positioned below the process liner 1 and used for plugging the main pipeline 3 when the surfacing layer of the main pipeline 3 is maintained;
the upper and/or lower surface of the plug 2 is provided with a radiation protective coating.
It can be understood that stopper 2 is installed in trunk line 3 to can prevent in the foreign matter entering trunk line 3, can prevent during the defect maintenance foreign matter entering trunk line 3 that the cutting etc. of polishing produced, avoid the pipeline to wash again, simplify the process.
It should be noted that, when performing build-up welding around the opening of the main pipeline 3, a constructor can start and stop arc on the process liner 1, so that the build-up welding layer which is easy to generate defects during build-up welding is left on the process liner 1, and is eliminated through a drilling mode subsequently.
In some possible implementations of the embodiments of the present application, as shown in fig. 1 and 2, the plug 2 has a cylindrical structure and a diameter not greater than the inner diameter of the main pipe 4;
the upper surface of the upper sealing plate 21 is provided with an upper sealing plate radiation plating layer 24;
the lower surface of the lower sealing plate 22 is provided with a lower sealing plate radiation plating layer 25.
As an example, the upper and lower sealing plate radiation-emitting plating layers 24 and 25 are made of a lead-containing material.
When concrete implementation, go up shrouding 21, stopper core 23 and shrouding 22 down and connect as an organic wholely through the bonding mode, go up the shrouding and put radiation coating 24 and lower shrouding and put radiation coating 25 and glue respectively at the upper surface of last shrouding 21 and shrouding 22's lower surface down, can avoid constructor directly to expose under the radioactive medium to have the shielding effect to the radiation, can effectively less personnel exposure dose, thereby realize the shielding operation to the radiation.
In some possible implementation manners of the embodiment of the present application, as shown in fig. 1 and fig. 2, the plug 2 may further include: a control lever 26;
the plug core 23 is made of a flexible material that can be stretched and compressed;
a control rod 26 for controlling the stretching and compressing of the plug 23.
The plug core 23 is stretched and compressed by the control rod 26, and when the plug core 23 is in a stretched state, the diameter of the plug core 23 is reduced, so that the plug 2 can be smoothly mounted at a specified position. When stopper core 23 is in compression state, 23 diameter grow of stopper core to realize that stopper core 23 firmly expands in trunk line 3, realize sending into and the fastening of stopper 2, can realize the quick installation of device, and can avoid droing, saved the engineering time.
In one example, the plug 1 is provided with a hole 27 penetrating through the upper sealing plate for placing the radiation plating layer 24, the upper sealing plate 21, the plug core 23 and the lower sealing plate 22;
a boss 28 is arranged in the hole 27 of the lower sealing plate 22, and one end of the control rod 26 extends into the hole 27 and is clamped at the boss 28;
the hole 27 of the upper sealing plate 21 and the control rod 26 are provided with mutually matched threads, so that the upper sealing plate 21 can move up and down along the control rod 26;
the other end of the control rod 26 extends from the hole 27.
It will be appreciated that the rod 26 extends through the aperture 27 at one end and is captured in the boss 28 and that the upper plate 21 moves up and down the rod 26 to compress and expand the distance between the upper plate 21 and the lower plate 22 and thereby control the extension and compression of the plug 23.
In some possible implementations of the embodiments of the present application, as shown in fig. 1 and 3, the process liner 1 is a cylindrical structure with a wide top and a narrow bottom, and the diameter of the upper end of the process liner 1 is not greater than the inner diameter of the main pipe 3, so as to facilitate installation;
the process liner 1 is provided with a mounting through hole 11, the mounting through hole 11 is provided with threads for mounting a clamping bolt 12, and the process liner 1 is placed in the main pipeline 4 through the clamping bolt 12.
In practical application, the upper end of the process liner 1 can be installed at the opening of the main pipe 4 by spot welding.
In practice, the process pad 1 may be composed of a metallic material similar to the main pipe 3. During the use, the mounting through-hole 11 is screwed in to centre gripping bolt 12, puts technology liner 1 in trunk line 3 suitable position through centre gripping bolt 12, and technology liner 1 is fixed in trunk line 3 through spot welding mode on, then screws off centre gripping bolt 12.
Based on the device for maintaining the fillet weld overlaying layer of the nuclear power station provided by the embodiment, the embodiment of the application also provides a method for maintaining the fillet weld overlaying layer of the nuclear power station, and the device is applied to any device for maintaining the fillet weld overlaying layer of the nuclear power station provided by the embodiment.
Referring to fig. 4, the figure is a schematic flow chart of a method for repairing a fillet weld overlay of a nuclear power plant according to an embodiment of the present disclosure.
The method for maintaining the fillet weld surfacing layer of the nuclear power station comprises the following steps:
s401: the plug 1 is mounted inside the main pipe 3 by a nipple socket 41 on the main pipe 3, as shown in fig. 5.
S402: the socket 41 is cut away and the weld overlay 51 is ground along the weld overlay 51 of the socket 41.
S403: the process liner 1 is installed at the opening of the main pipe 3 as shown in fig. 6.
S404: a new weld overlay 52 is applied to the opening of the main pipe 3 and to the process liner 1 as shown in fig. 7.
S405: the mounting hole is formed by reaming with a drill centered on the midpoint of the process pad 1 and the end of the new weld overlay 52 is removed as shown in fig. 8.
S406: the positioning rod 43 of the new stem 42 is inserted into the mounting hole, and the new stem 42 and the new build-up layer 52 are welded, as shown in fig. 9.
In the embodiment of the present application, the original shape of the new tube seat 42 is a cylinder structure with thin centers at both ends and thick solid center, the center of the upper end is opened with a hollow (i.e. V-shaped hole 44) for later drilling and positioning, the lower end is provided with a section of boss 45 for positioning and positioning, after welding, finish machining is performed by drilling to realize the function of tube seat
S407: the process pad 1 and alignment rods 43 are removed by reaming through the V-shaped holes 44 of the new stem 42 as shown in fig. 10.
S408: the plug 2 is removed.
In some possible implementation manners of the embodiment of the present application, before the step S401, the method may further include:
the branch pipes to which the nozzle 41 is connected are cut along the butt weld of the nozzle 41.
In some possible implementation manners of the embodiment of the present application, after step S407, the method may further include:
the counterbores are finished to allow the new nipple seats 42 to meet the design dimensional requirements.
The present application has been described in detail with reference to the drawings and examples, but the present application is not limited to the above examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. The prior art can be used for all the contents which are not described in detail in the present application.
Claims (7)
1. An apparatus for repair of a fillet weld overlay in a nuclear power plant, the apparatus comprising: process liners and stoppers;
the process gasket is arranged at an opening of a main pipeline and used for arcing and arc extinguishing on the process gasket when a surfacing layer of the main pipeline is maintained;
the plug is arranged in the main pipeline and is positioned below the process gasket and used for plugging the main pipeline when a surfacing layer of the main pipeline is maintained;
and the upper surface and/or the lower surface of the plug are/is provided with a radiation-proof coating.
2. The apparatus for weld overlay repair in nuclear power plant fillet weld according to claim 1,
the plug is of a cylindrical structure and the diameter of the plug is not larger than the inner diameter of the main pipeline;
the stopper, comprising: the plug core is fixed between the upper sealing plate and the lower sealing plate;
the upper surface of the upper sealing plate is provided with an upper sealing plate radiation coating;
the lower surface of the lower sealing plate is provided with a lower sealing plate radiation coating.
3. The apparatus for weld overlay repair in a nuclear power plant fillet weld according to claim 2,
the upper sealing plate radiation plating layer and the lower sealing plate radiation plating layer are both made of lead-containing materials.
4. The apparatus for weld overlay repair at nuclear power plant fillet weld according to claim 2, wherein the plug further comprises: a control lever;
the plug core is made of a flexible material that can be stretched and compressed;
the control rod is used for controlling the stretching and the compression of the plug core.
5. The apparatus for weld overlay repair in a nuclear power plant fillet weld according to claim 4,
the plug is provided with a hole which penetrates through the upper sealing plate to place the radiation coating, the upper sealing plate, the plug core and the lower sealing plate;
a boss is arranged in the hole of the lower sealing plate, and one end of the control rod extends into the hole and is clamped at the boss;
the hole of the upper sealing plate and the control rod are provided with mutually matched threads so as to enable the upper sealing plate to move up and down along the control rod;
the other end of the control rod extends out of the hole.
6. The apparatus for weld overlay repair in a nuclear power plant fillet weld according to claim 1,
the process liner is of a cylindrical structure with a wide upper part and a narrow lower part, and the diameter of the upper end of the process liner is not larger than the inner diameter of the main pipeline;
the process liner is characterized in that a mounting through hole is formed in the process liner, threads are formed in the mounting through hole and used for mounting a clamping bolt, and the process liner is placed in the main pipeline through the clamping bolt.
7. The apparatus for weld overlay repair in a nuclear power plant fillet weld according to claim 6,
the upper end of the process liner is arranged at the opening of the main pipeline in a spot welding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123014398.9U CN217045273U (en) | 2021-12-03 | 2021-12-03 | Device for maintaining fillet weld surfacing layer of nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123014398.9U CN217045273U (en) | 2021-12-03 | 2021-12-03 | Device for maintaining fillet weld surfacing layer of nuclear power station |
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| CN217045273U true CN217045273U (en) | 2022-07-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227153A (en) * | 2021-12-03 | 2022-03-25 | 江苏核电有限公司 | Device and method for maintaining fillet weld overlaying layer of nuclear power station |
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- 2021-12-03 CN CN202123014398.9U patent/CN217045273U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114227153A (en) * | 2021-12-03 | 2022-03-25 | 江苏核电有限公司 | Device and method for maintaining fillet weld overlaying layer of nuclear power station |
| CN114227153B (en) * | 2021-12-03 | 2024-07-16 | 江苏核电有限公司 | Device and method for repairing fillet weld surfacing layer of nuclear power station |
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