CN107900504B - Fuel rod pressure resistance welding chuck - Google Patents
Fuel rod pressure resistance welding chuck Download PDFInfo
- Publication number
- CN107900504B CN107900504B CN201711345548.XA CN201711345548A CN107900504B CN 107900504 B CN107900504 B CN 107900504B CN 201711345548 A CN201711345548 A CN 201711345548A CN 107900504 B CN107900504 B CN 107900504B
- Authority
- CN
- China
- Prior art keywords
- chuck
- fuel rod
- metal sheets
- welding
- rear end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
Abstract
The invention discloses a fuel rod pressure resistance welding chuck which comprises a chuck body, wherein the chuck body comprises a chuck front end and a chuck rear end, a plurality of metal sheets are arranged between the chuck front end and the chuck rear end, the surfaces of two adjacent metal sheets which are contacted with each other are provided with insulating coatings, the surfaces of the metal sheets which are contacted with the chuck body are also provided with insulating coatings, all the metal sheets are axially overlapped and distributed along a fuel rod, all the metal sheets, the chuck front end and the chuck rear end are connected through at least one electric conductor, and the resistance values of the electric conductor, a shell tube and an end plug are matched with each other. The invention can ensure that the welding current is distributed more uniformly along the longitudinal direction of the fuel rod, more obviously increase the welding compact area, improve the welding performance between the end plug and the cladding tube, and overcome the defects of small current flowing area and short longitudinal length of a welding line caused by small local resistance when a copper clamp is adopted.
Description
Technical Field
The invention relates to the technical field of resistance welding, in particular to a fuel rod pressure resistance welding chuck.
Background
The pressure resistance welding of the fuel rod is that the end plug and the cladding tube are butt welded into a whole, the end face of the cladding tube is contacted with the matching surface of the end plug under the action of small extrusion force, current is applied to a workpiece through an electrode, because the resistance of the contact surface of the workpiece is high, resistance heat generated by the contact surface and an adjacent area enables metal of a welding surface to be in a plastic state, then upsetting force is rapidly applied to a joint, and the end plug and the cladding tube are welded by means of upsetting.
An important technical problem of pressure resistance welding of fuel rods is how to obtain a longitudinal weld of sufficient length. Fig. 1 shows a case of welding using a conventional copper clamp, in which arrows indicate the direction of current flow, since current tends to flow through a region of lower resistance, while the resistivity of the cladding tube is greater than that of the copper clamp, and most of the current flows directly to the cladding tube and the copper clamp via a region of the end plug without flowing longitudinally on the cladding tube, resulting in a smaller longitudinal length L1 of the weld between the cladding tube and the end plug, while the length L2 of the non-welded region is greater, and the length of the welded tight region is difficult to achieve the desired target.
Disclosure of Invention
The invention aims to overcome the defect that the longitudinal length of a welding seam is smaller when a copper chuck is adopted for carrying out pressure resistance welding on a fuel rod in the prior art, and provides a pressure resistance welding chuck for the fuel rod.
In order to achieve the above purpose, the invention provides the following technical scheme:
the utility model provides a fuel rod pressure resistance welds chuck, includes the chuck body, the chuck body includes chuck front end and chuck rear end. The fuel rod clamping device is characterized in that a plurality of metal sheets are arranged between the front end of the clamping head and the rear end of the clamping head, the surfaces of the adjacent metal sheets, which are in contact with each other, are provided with insulating coatings, the surfaces of the metal sheets, which are in contact with the clamping head body, are also provided with insulating coatings, and all the metal sheets are axially stacked and distributed along the fuel rod. All the metal sheets, the front end of the chuck and the rear end of the chuck are connected through at least one electric conductor, and the electric conductors, the cladding tube and the end plugs are matched in resistance value.
According to the fuel rod pressure resistance welding chuck, due to the fact that a plurality of metal sheets which are mutually insulated are adopted, the metal sheets, the front end of the chuck and the rear end of the chuck are connected through one or a plurality of electric conductors, and the electric conductors, the cladding tube and the end plugs are mutually matched in resistance value (for fuel rod cladding tubes with different diameters and wall thicknesses, the resistance value of the electric conductors can be matched and optimized through the welding test result), welding current can flow to each metal sheet along the electric conductors, and then flows to the cladding tube and the end plugs through each metal sheet respectively, so that the welding current is distributed uniformly along the longitudinal direction of a fuel rod, a welding compact area is increased obviously, and the welding performance between the end plugs and the cladding tube is improved. On the other hand, the defects that the current flowing area is small and the longitudinal length of the welding seam is short due to small local resistance when the copper clamp is adopted are overcome.
Preferably, the electrical conductor is mounted to the metal sheet, the front end of the collet and the rear end of the collet via at least one mounting hole.
Preferably, the installation hole is internally provided with an internal thread, and the electric conductor is provided with an external thread matched with the internal thread, so that the installation and the disassembly are convenient.
Preferably, the electric conductor is arranged on the outer sides of the metal sheet, the front end of the chuck and the rear end of the chuck, and the installation and the disassembly are convenient.
Preferably, the chuck body comprises at least two arc-shaped chuck units, and all the chuck units mutually surround a circular chuck body, so that circumferential welding is realized.
Preferably, the front end of the chuck, the metal sheet and the rear end of the chuck are connected through high-strength plastic screws, and the high-strength plastic screws are not conductive.
Compared with the prior art, the invention has the beneficial effects that:
according to the fuel rod pressure resistance welding chuck, due to the fact that a plurality of metal sheets which are mutually insulated are adopted, the metal sheets, the front end of the chuck and the rear end of the chuck are connected through one or a plurality of electric conductors, and the electric conductors, the cladding tube and the end plugs are mutually matched in resistance value (for fuel rod cladding tubes with different diameters and wall thicknesses, the resistance value of the electric conductors can be matched and optimized through the welding test result), welding current can flow to each metal sheet along the electric conductors, and then flows to the cladding tube and the end plugs through each metal sheet respectively, so that the welding current is distributed uniformly along the longitudinal direction of a fuel rod, a welding compact area is increased obviously, and the welding performance between the end plugs and the cladding tube is improved. On the other hand, the defects that the current flowing area is small and the longitudinal length of the welding seam is short due to small local resistance when the copper clamp is adopted are overcome.
Description of the drawings:
fig. 1 is a current distribution diagram of resistance welding using a copper cartridge according to the prior art.
FIG. 2 is a current distribution diagram for resistance welding using the fuel rod pressure resistance welding collet described in example 1.
FIG. 3 is a current distribution diagram for resistance welding using the fuel rod pressure resistance welding collet described in example 2.
Fig. 4 is a schematic view of the structure of the conductor described in example 1.
FIG. 5 is a schematic view of the structure of a fuel rod pressure resistance welding collet according to example 1.
Fig. 6 is a schematic view of the structure of the conductor described in example 2.
FIG. 7 is a schematic view of the structure of a fuel rod pressure resistance welding collet according to example 2.
The labels in the figure are: 1-a cladding tube, 2-an end plug, 3-a chuck body, 31-a chuck front end, 32-a chuck rear end, 4-an electric conductor, 5-a metal sheet and 6-a plastic screw.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 4-5, a fuel rod pressure resistance welding collet includes a collet body 3, the collet body 3 including a collet front end 31 and a collet rear end 32. A plurality of metal sheets 5 are arranged between the front end 31 and the rear end 32 of the chuck, the front end 31, the metal sheets 5 and the rear end 32 of the chuck are connected through two high-strength plastic screws 6, and the high-strength plastic screws 6 are not conductive.
The surfaces of the adjacent two metal sheets 5 which are in contact with each other are provided with insulating coatings, the surfaces of the metal sheets 5 which are in contact with the chuck body 3 are also provided with insulating coatings, and all the metal sheets 5 are axially overlapped and distributed along the fuel rod. All the metal sheets 5, the front end 31 and the rear end 32 of the chuck are connected by at least one electric conductor 4, and the electric resistance values of the electric conductor 4, the cladding tube 1 and the end plug 2 are matched with each other.
The electrical conductor 4 is mounted on the metal sheet 5, the front end 31 and the rear end 32 of the chuck via at least one mounting hole. The installation hole is internally provided with an internal thread, and the electric conductor 4 is provided with an external thread matched with the internal thread, so that the installation and the disassembly are convenient.
The chuck body 3 comprises at least two arc-shaped chuck units, and all the chuck units mutually enclose a circular chuck body 3, so that circumferential welding is realized.
According to the fuel rod pressure resistance welding chuck, a plurality of mutually insulated metal sheets 5 are adopted, the metal sheets 5, the front end 31 of the chuck and the rear end 32 of the chuck are connected through one or a plurality of electric conductors 4, and the electric resistances of the electric conductors 4, the cladding tube 1 and the end plug 2 are mutually matched (for fuel rod cladding tubes with different diameters and wall thicknesses, the electric resistance of the electric conductors can be matched and optimized through the welding test result), so that the welding current can flow to each metal sheet 5 along the electric conductors 4 and respectively flows to the cladding tube 1 and the end plug 2 through each metal sheet 5, the welding current is relatively uniformly distributed along the longitudinal direction of the fuel rod (as shown in figure 2), the welding compact area is relatively obviously increased, and the welding performance between the end plug 2 and the cladding tube 1 is improved. On the other hand, the defects that the current flowing area is small and the longitudinal length of the welding seam is short due to small local resistance when the copper clamp is adopted are overcome.
Example 2
As shown in fig. 3, 6 and 7, the present embodiment is different from embodiment 1 in that the conductor 4 is mounted on the outer sides of the metal sheet 5, the collet front end 31 and the collet rear end 32, and is convenient to mount and dismount.
The above embodiments are only used for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modification or equivalent replacement of the present invention is made; all such modifications and variations are intended to be included herein within the scope of this disclosure and the appended claims.
Claims (4)
1. The fuel rod pressure resistance welding chuck is characterized by comprising a chuck body (3), wherein the chuck body (3) comprises a chuck front end (31) and a chuck rear end (32);
a plurality of metal sheets (5) are arranged between the front end (31) and the rear end (32) of the chuck, the surfaces of two adjacent metal sheets (5) which are in contact are provided with insulating coatings, the surfaces of the metal sheets (5) which are in contact with the chuck body (3) are also provided with insulating coatings, and all the metal sheets (5) are stacked and distributed along the axial direction of the fuel rod;
all the metal sheets (5), the front end (31) and the rear end (32) of the chuck are connected through at least one electric conductor (4), and the electric conductors (4), the cladding tube (1) and the end plug (2) are matched in resistance value.
2. Fuel rod pressure resistance welding collet according to claim 1, characterized in that the electrical conductor (4) is mounted on the metal sheet (5), the collet front end (31) and the collet rear end (32) by means of at least one mounting hole.
3. The fuel rod pressure resistance welding collet according to claim 2, wherein the mounting hole is internally threaded and the electrical conductor (4) is provided with a matching external thread.
4. Fuel rod pressure resistance welding collet according to claim 1, characterized in that the electrical conductor (4) is mounted outside the metal sheet (5), the collet front end (31) and the collet rear end (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711345548.XA CN107900504B (en) | 2017-12-14 | 2017-12-14 | Fuel rod pressure resistance welding chuck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711345548.XA CN107900504B (en) | 2017-12-14 | 2017-12-14 | Fuel rod pressure resistance welding chuck |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107900504A CN107900504A (en) | 2018-04-13 |
| CN107900504B true CN107900504B (en) | 2019-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711345548.XA Active CN107900504B (en) | 2017-12-14 | 2017-12-14 | Fuel rod pressure resistance welding chuck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107900504B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111185657B (en) * | 2020-01-14 | 2022-03-25 | 西华大学 | Cladding tube electrode and preparation method thereof |
| CN111724918B (en) * | 2020-06-29 | 2022-08-12 | 西安建筑科技大学 | Weak rigidity cladding pipe area upset power spin friction welded connects |
| CN112756859B (en) * | 2020-12-30 | 2023-03-21 | 中核北方核燃料元件有限公司 | Method for confirming gap between end plug and inner welding seam of cladding tube |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2139176C1 (en) * | 1997-10-08 | 1999-10-10 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Joint forming device at resistance butt-welding of pipe with plug |
| RU2286235C1 (en) * | 2005-05-23 | 2006-10-27 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Method of manufacture of device for contact butt welding of pipe with plug |
| US9922731B2 (en) * | 2012-04-17 | 2018-03-20 | Bwxt Mpower, Inc. | Resistance welding of an end cap for nuclear fuel rods |
| CN106735754B (en) * | 2016-12-13 | 2019-09-17 | 中核北方核燃料元件有限公司 | A kind of welding method of annular fuel element |
| CN107214405A (en) * | 2017-05-22 | 2017-09-29 | 彭州市长庆全成技术开发有限公司 | A kind of end plug chuck |
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2017
- 2017-12-14 CN CN201711345548.XA patent/CN107900504B/en active Active
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| Publication number | Publication date |
|---|---|
| CN107900504A (en) | 2018-04-13 |
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