CN111554422B - End plug for eliminating welding seam gas expansion defect - Google Patents
End plug for eliminating welding seam gas expansion defect Download PDFInfo
- Publication number
- CN111554422B CN111554422B CN202010278982.6A CN202010278982A CN111554422B CN 111554422 B CN111554422 B CN 111554422B CN 202010278982 A CN202010278982 A CN 202010278982A CN 111554422 B CN111554422 B CN 111554422B
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- CN
- China
- Prior art keywords
- end plug
- cladding tube
- welding seam
- defect
- gas expansion
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- 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
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
- G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to the technical field of nuclear fuel element manufacturing, and particularly discloses an end plug for eliminating the defect of welding seam gas expansion, wherein a matching section of the end plug inserted into a cladding tube is of a cylindrical structure, and the rest part of the end plug is processed into a conical surface; and a gas guide groove is processed on the matching section of the end plug and the cladding tube and is used as a channel for discharging gas generated in the welding process into the inner cavity of the cladding tube. The end plug structure can effectively eliminate the gas expansion defect in the welding seam of the fuel rod end plug and the cladding tube, reduce the gas expansion defect rate in the welding seam to be below 3 percent, and improve the yield of the welding seam.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel element manufacturing, and particularly relates to an end plug for eliminating a weld joint gas expansion defect.
Background
Welding of fuel rod end plugs to cladding tubes is an essential link in nuclear fuel element manufacture. As shown in FIGS. 1 to 3, the length of the matching section of the currently used end plug and the cladding tube is larger than 1.5mm, so that the weld seam ballooning defect is easily generated in the welding process of the end plug and the cladding tube. The existence of the defect can reduce the effective section of the welding seam, reduce the weld penetration, reduce the mechanical strength of the welding joint, seriously affect the air tightness and cause the leakage of the fuel rod.
The current method for eliminating the weld joint ballooning defect is as follows: firstly, the end plugs and the pipe orifices are strictly cleaned before welding; secondly, enough plug pressing force is adopted; and thirdly, selecting proper welding process parameters. However, even with the above method, the defect rate of the ballooning in the weld can still reach more than 20%, resulting in a large number of defective products.
Therefore, there is a need to solve the above problems by designing a new end plug structure that eliminates the ballooning defect.
Disclosure of Invention
The invention aims to provide an end plug for eliminating the defect of welding seam gas expansion so as to eliminate the defect of gas expansion in the welding seam of a fuel rod end plug and a cladding tube.
The technical scheme of the invention is as follows:
the fitting section of the end plug inserted into the cladding tube is of a cylindrical structure, and the rest part of the end plug is processed into a conical surface.
The length of the matched section of the end plug and the cladding tube is 0.4-0.9 mm.
The taper of the conical surface is more than or equal to 1 degree.
The total length of the end plug inserted into the cladding tube is > 1.5 mm.
And a gas guide groove is processed on the matching section of the end plug and the cladding tube and is used as a channel for discharging gas generated in the welding process into the inner cavity of the cladding tube.
The air guide grooves are spirally and circularly arranged along the circumferential direction of the end plug.
The depth of the air guide groove is 0.005-0.015 mm, and the width of the air guide groove is 0.1-0.2 mm.
The air guide grooves are arranged with 2-9 circles at equal intervals.
The total length of the end plug inserted into the cladding tube is larger than 1.5mm, the length of a matching section of the end plug and the cladding tube is 0.4-0.9 mm, and the taper of the conical surface is larger than or equal to 1 degree;
and a gas guide groove is processed on the matching section of the end plug and the cladding tube and is used as a channel for discharging gas generated in the welding process into the inner cavity of the cladding tube.
The air guide grooves are spirally and circularly arranged along the circumferential direction of the end plug.
The invention has the following remarkable effects:
(1) according to the invention, the matching length of the end plug and the cladding tube is reduced to 0.4-0.9 mm, so that gas generated in the welding process is easier to discharge into the inner cavity of the cladding tube, and the occurrence of an air inflation defect is avoided.
(2) According to the invention, the air guide groove structure is designed on the matching length of the end plug and the cladding tube, so that gas generated in the welding process is discharged into the inner cavity of the cladding tube to form a channel, and the welding gas expansion defect is better avoided.
(3) The end plug structure can effectively eliminate the gas expansion defect in the welding seam of the fuel rod end plug and the cladding tube, reduce the gas expansion defect rate in the welding seam to be below 3 percent, and improve the yield of the welding seam.
Drawings
FIG. 1 is a schematic view of an original design end plug;
FIG. 2 is a cladding tube schematic view;
FIG. 3 is a schematic view of the assembly of an end plug and cladding tube of the original design;
figure 4 is a schematic view of an end plug according to the invention;
FIG. 5 is an enlarged view at I of FIG. 4;
figure 6 is a schematic view of an assembly of an end plug and cladding tube of the present invention.
In the figure: 1. the method comprises the steps of originally designing an end plug, 2. a cladding tube, 3. an end plug, 4. an air inflation defect, 5. an air guide groove, 6. a welding line and 7. an inner cavity of the cladding tube.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
In the end plug for eliminating the weld seam ballooning defect shown in fig. 4-6, the total length of the end plug 3 inserted into the cladding tube 2 is more than 1.5 mm; the matching section of the end plug 3 and the cladding tube 2 is of a cylindrical structure, the length is 0.4-0.9 mm, the matching length is reduced compared with the prior art, and gas generated in the welding process is easy to discharge into the inner cavity of the cladding tube; the other part is processed into a conical surface, the taper is more than or equal to 1 degree, so that the gap between the end plug 3 and the cladding tube 2 is gradually enlarged, and gas generated in the welding process is conveniently and smoothly discharged into the inner cavity 7 of the cladding tube.
And a spirally-surrounded gas guide groove 5 is processed on the matching section of the end plug 3 and the cladding tube 2 along the circumferential direction of the end plug 3 and is used as a channel for discharging gas generated in the welding process into an inner cavity 7 of the cladding tube, so that the welding gas expansion defect is avoided.
The air guide grooves 5 are arranged with 2-9 circles at equal intervals, the depth is 0.005-0.015 mm, and the width is 0.1-0.2 mm.
Claims (4)
1. An end plug for eliminating weld seam ballooning defects is characterized in that: the matching section of the end plug (3) inserted into the cladding tube (2) is of a cylindrical structure, and the rest part of the end plug is processed into a conical surface;
the length of a matching section of the end plug (3) and the cladding tube (2) is 0.4-0.9 mm;
the taper of the conical surface is more than or equal to 1 degree;
the total length of the end plug (3) inserted into the cladding tube (2) is more than 1.5 mm;
and a gas guide groove (5) is processed on the matching section of the end plug (3) and the cladding tube (2) and is used as a channel for discharging gas generated in the welding process into the inner cavity (7) of the cladding tube.
2. An end plug for eliminating weld ballooning defects as set forth in claim 1, wherein: the air guide groove (5) is spirally and circularly arranged along the circumferential direction of the end plug (3).
3. An end plug for eliminating weld ballooning defects as set forth in claim 2, wherein: the depth of the air guide groove (5) is 0.005-0.015 mm, and the width is 0.1-0.2 mm.
4. An end plug for eliminating weld ballooning defects as set forth in claim 3, wherein: the air guide grooves (5) are arranged with 2-9 circles at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278982.6A CN111554422B (en) | 2020-04-10 | 2020-04-10 | End plug for eliminating welding seam gas expansion defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010278982.6A CN111554422B (en) | 2020-04-10 | 2020-04-10 | End plug for eliminating welding seam gas expansion defect |
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| Publication Number | Publication Date |
|---|---|
| CN111554422A CN111554422A (en) | 2020-08-18 |
| CN111554422B true CN111554422B (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010278982.6A Active CN111554422B (en) | 2020-04-10 | 2020-04-10 | End plug for eliminating welding seam gas expansion defect |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114083102B (en) * | 2021-11-29 | 2023-05-23 | 中国原子能科学研究院 | Fuel target and welding method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4865804A (en) * | 1984-05-02 | 1989-09-12 | Westinghouse Electric Corp. | Fuel rod end plug |
| JPH095485A (en) * | 1995-06-22 | 1997-01-10 | Toshiba Corp | Nuclear fuel cladding tube and manufacture thereof |
| US5966980A (en) * | 1994-09-29 | 1999-10-19 | General Electric Company | Method for fabricating end plugs for nuclear fuel rods |
| CN1905983A (en) * | 2003-11-20 | 2007-01-31 | 特赖器械公司 | Process for welding |
| CN101912919A (en) * | 2010-07-16 | 2010-12-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Composite forming method of gas bulging forming and thermal forming and device used by same |
| CN102324255A (en) * | 2011-08-02 | 2012-01-18 | 中国核电工程有限公司 | Thickness compensation method and compensation block for fuel rod end plug welding line X ray transillumination process |
| CN104722894A (en) * | 2013-12-18 | 2015-06-24 | 中核建中核燃料元件有限公司 | Nuclear rod multifunctional full automatic TIG welding device |
| CN109175813A (en) * | 2018-10-30 | 2019-01-11 | 江苏卫蓝医疗科技有限公司 | It is a kind of for medical gas pipeline welding pipe in plugging device |
| CN109604904A (en) * | 2018-12-29 | 2019-04-12 | 中核北方核燃料元件有限公司 | A kind of nuclear fuel assembly grid spacer welding fixture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9969031B2 (en) * | 2015-03-02 | 2018-05-15 | CRC—Evans Pipeline International, Inc. | Near-weld purge gas delivery system |
-
2020
- 2020-04-10 CN CN202010278982.6A patent/CN111554422B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4865804A (en) * | 1984-05-02 | 1989-09-12 | Westinghouse Electric Corp. | Fuel rod end plug |
| US5966980A (en) * | 1994-09-29 | 1999-10-19 | General Electric Company | Method for fabricating end plugs for nuclear fuel rods |
| JPH095485A (en) * | 1995-06-22 | 1997-01-10 | Toshiba Corp | Nuclear fuel cladding tube and manufacture thereof |
| CN1905983A (en) * | 2003-11-20 | 2007-01-31 | 特赖器械公司 | Process for welding |
| CN101912919A (en) * | 2010-07-16 | 2010-12-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Composite forming method of gas bulging forming and thermal forming and device used by same |
| CN102324255A (en) * | 2011-08-02 | 2012-01-18 | 中国核电工程有限公司 | Thickness compensation method and compensation block for fuel rod end plug welding line X ray transillumination process |
| CN104722894A (en) * | 2013-12-18 | 2015-06-24 | 中核建中核燃料元件有限公司 | Nuclear rod multifunctional full automatic TIG welding device |
| CN109175813A (en) * | 2018-10-30 | 2019-01-11 | 江苏卫蓝医疗科技有限公司 | It is a kind of for medical gas pipeline welding pipe in plugging device |
| CN109604904A (en) * | 2018-12-29 | 2019-04-12 | 中核北方核燃料元件有限公司 | A kind of nuclear fuel assembly grid spacer welding fixture |
Non-Patent Citations (1)
| Title |
|---|
| AFA3G燃料棒下端塞电子束焊产生气胀的分析;朱国胜 等;《核动力工程》;20021031;第23卷(第5期);全文 * |
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| CN111554422A (en) | 2020-08-18 |
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