CN114571075A - Welding method for miniature fission chamber signal outgoing line - Google Patents
Welding method for miniature fission chamber signal outgoing line Download PDFInfo
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- CN114571075A CN114571075A CN202210268334.1A CN202210268334A CN114571075A CN 114571075 A CN114571075 A CN 114571075A CN 202210268334 A CN202210268334 A CN 202210268334A CN 114571075 A CN114571075 A CN 114571075A
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
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- 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
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Aiming at the problems that the welding space is small and welding is difficult when an ultra-fine core and a wire in a micro fission chamber are welded, fusing, virtual connection and overlarge welding spot stress are easy to occur in the welding process, the invention provides a welding method of a signal outgoing line of the micro fission chamber. The method specifically comprises the following steps: cleaning the workpiece to be welded with alcohol; fusing one end of the signal outgoing line into a spherical shape and then butt-welding the spherical end with the end face of the kovar signal column; detecting the strength of the welding spot by using a tension meter; after the welding strength is qualified, the signal lead-out wire is wound into a spiral shape; fusing the other end of the signal outgoing line and the to-be-welded end of the core wire of the driving cable into a spherical shape and then butt-welding; and detecting the strength of the welding spot by using a tension meter, and finishing the welding assembly of the superfine core and the wire if the strength is qualified. The method not only improves the lapping condition of the whole superfine core wire, reduces the welding difficulty, ensures the strength of the welding spot, but also ensures that the welding spot works at a lower stress level in the subsequent use process, realizes the high-reliability assembly of the miniature fission chamber, and ensures the accuracy of the fluence rate measurement.
Description
Technical Field
The invention belongs to the field of welding of miniature devices, and particularly relates to a welding method of a miniature fission chamber superfine signal outgoing line.
Background
In 2019, a micro fission chamber neutron detector for a CPR1000 reactor is developed by a China institute for engineering and physics and chemistry in combination with a Chinese institute for nuclear physics and chemistry in the middle and Guangdong nuclear research institute to realize the measurement of the neutron fluence rate in the reactor core fingerstall tube. Because of the reactor core dactylotheca space is narrow and small, for promoting miniature fission room space utilization and leakproofness, each spare part of its inside not only designs very little, and each part is connected moreover and is sealed the assembly with the welded mode more to lead to miniature fission room spare part production and assembly process requirement higher.
Wherein, need carry out the welding assembly through the signal lead-out wire between miniature fission indoor insulation kovar signal post and the drive cable. Firstly, the diameter of an insulation Kovar signal column is 1.0mm, the diameter of a core wire of a driving cable is 0.20mm, and the diameter of a signal leading-out wire is only 0.15mm, and the welding belongs to the welding of superfine materials. The defects that the welding spot strength is affected by fusing, welding spot virtual connection, overlarge welding spot stress, easy disconnection and the like easily occur to the superfine material, so that the open circuit of the miniature fission chamber in the working engineering is caused, and the measurement of the neutron fluence rate in the reactor core fingerstall tube is affected. Secondly, the assembly space between the insulated Kovar signal column and the core wire of the drive cable is limited, the assembly space is only the inner space of the insulating ring, the diameter of the assembly space is about 2.7mm, the welding space is limited, and the welding spot strength detection space is limited.
In order to ensure reliable connection between the miniature fission chamber indoor insulation Kovar signal column and the driving cable core wire, improve the normal working time of the miniature fission chamber and ensure the neutron fluence rate measurement of the reactor core thimble, a set of welding assembly process or method needs to be designed aiming at the superfine materials such as the miniature fission chamber indoor insulation Kovar signal column, the signal leading-out wire, the driving cable core wire and the like.
Disclosure of Invention
In order to achieve the purpose, the welding method of the superfine signal outgoing line of the miniature fission chamber is provided:
a welding method of a micro fission chamber superfine signal outgoing line comprises the following steps:
s1, cleaning, dehydrating and drying the whole section of the signal outgoing line, the end to be welded of the insulated Kovar signal column and the end to be welded of the core wire of the driving cable by using alcohol;
s2, fusing one end of the signal outgoing line into a spherical end to be welded by laser welding, butting the spherical end to be welded with the end face of the insulated Kovar signal column, and welding the insulated Kovar signal column and the signal outgoing line by laser spot welding;
s3, testing the strength of a welding spot between the insulated Kovar signal column and the signal leading-out wire by using a tension meter, and if the strength of the welding spot is more than or equal to 3 pounds, welding the insulated Kovar signal column and the signal leading-out wire to be qualified;
s4, winding the signal lead-out wire into a spiral shape, wherein the outer diameter of the spiral shape is smaller than the inner diameter of the insulating ring;
s5, fusing the other end of the signal outgoing line into a spherical end to be welded by laser welding, fusing the end to be welded of the core wire of the driving cable into the spherical end to be welded by laser welding, butting the two spherical ends to be welded, and welding the core wire of the driving cable and the signal outgoing line by laser spot welding;
s6, testing the strength of the welding spot between the core wire of the drive cable and the signal leading-out wire by using a tension meter, if the strength of the welding spot is more than or equal to 3 pounds, welding the core wire of the drive cable and the signal leading-out wire to be qualified, and completing the welding assembly between the insulation Kovar signal column and the core wire of the drive cable.
Preferably, the end surface to be welded of the insulated kovar signal post in the step S1 is perpendicular to the axis of the insulated kovar signal post.
Preferably, when the spherical end to be welded of the signal lead wire is butted with the end face of the insulated kovar signal column in step S2, the spherical end to be welded of the signal lead wire must not exceed the edge of the end face of the insulated kovar signal column.
Preferably, when the spherical end to be welded of the signal outgoing line is butted with the end face of the insulated kovar signal column in step S2, the signal outgoing line ball is coaxial with the insulated kovar signal column, so as to ensure that the spherical end to be welded of the signal outgoing line is located in the center of the end face of the insulated kovar signal column.
Preferably, in step S4, the number of turns of the signal lead-out wire wound in a spiral shape is two.
Preferably, the ball diameter of the spherical to-be-welded end of the signal lead wire in steps S2 and S5 is 0.2mm to 0.3mm, and the ball diameter of the spherical to-be-welded end of the driving cable core in step S5 is 0.3 mm.
Preferably, the welding power used for laser spot welding of the insulated kovar signal column and the signal lead wire in the step S2 is 40W, and the welding power used for laser spot welding of the signal lead wire and the driving cable core wire in the step S5 is 30W.
The invention has the beneficial effects that: (1) treat the welding end through increasing the sphericity, increased the superfine material and treated the welding end overlap joint area, promoted two and treated the degree of centering of welding the terminal surface or the axiality of two superfine materials, improved superfine material overlap joint condition, greatly promoted the welding strength of superfine material solder joint, ensure that solder joint intensity meets the demands. (2) By spirally winding the superfine signal outgoing line, the welding space is favorably improved, and the welding difficulty of the superfine signal outgoing line and the core wire of the driving cable is reduced. (3) The superfine signal outgoing line is spirally wound, and compared with the mode that the superfine signal outgoing line is not spirally wound, the stress of welding spots of the superfine signal outgoing line is relatively small, and the stress of the welding spots at two ends of the signal outgoing line is kept at a relatively low level after the insulated Kovar is assembled. Finally, high-reliability assembly of micro and ultra-fine parts of the micro fission chamber is realized, and the accuracy of fluence rate measurement is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creating any labor. The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a spiral signal lead-out wire;
FIG. 2 is a schematic diagram of an insulated Kovar;
fig. 3 a schematic view of a driving cable core;
in the figure: 1. the signal outgoing line 2, the insulation kovar 3, the driving cable core wire 11, the first end to be welded of the signal outgoing line 12, the second end to be welded of the signal outgoing line 13, the spiral part 21, the insulation kovar signal column 22, the end to be welded of the signal column 31 and the end to be welded of the driving cable core wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following detailed description and accompanying drawings.
Example one
Fig. 1-3 show schematic structural views of a signal lead-out wire 1, an insulated kovar 2 and a driving cable core wire 3 in a micro fission chamber of a CPR1000 reactor, respectively. The diameter of the insulation Kovar signal column 21 is 1.0mm, the diameter of the drive cable core wire 3 is 0.20mm, the diameter of the signal leading-out wire 1 is only 0.15mm, and the welding belongs to the welding of superfine materials.
In order to ensure the reliable connection between the miniature fission indoor insulation Kovar signal column and the core wire of the driving cable and improve the welding condition, the welding is carried out according to the following steps:
(1) cleaning, dehydrating and drying the whole section of the signal outgoing line 1, the to-be-welded 22 insulating Kovar signal column and the to-be-welded end 31 of the core wire of the driving cable by using alcohol to remove oil stains on the surface;
(2) in order to improve the lapping condition of the superfine signal leading-out wire 1 and the insulation kovar signal post 21, the first end to be welded 11 of the signal leading-out wire is fused into a spherical end to be welded with the spherical diameter of 0.2 mm-0.3 mm by laser welding, the spherical end to be welded is butted with the end face of the end to be welded 22 of the signal post of the insulation kovar signal post 21, and the spherical end to be welded of the first end to be welded 11 of the signal leading-out wire cannot exceed the end face of the end to be welded 22 of the signal post. Preferably, the signal leading-out wire 1 and the insulated Kovar signal column 21 are coaxial as much as possible, the spherical end to be welded of the first end to be welded 11 of the signal leading-out wire is ensured to be positioned in the center of the end face of the end to be welded 22 of the insulated Kovar signal column, then the welding power is adjusted to 40W, spot welding is carried out, and the welding of the insulated Kovar signal column 21 and the signal leading-out wire 1 is completed;
(3) testing the strength of a welding spot between the insulated Kovar signal column 21 and the signal outgoing line 1 by using a tension meter, if the strength of the welding spot is more than or equal to 3 pounds, welding between the insulated Kovar signal column 21 and the signal outgoing line 1 is qualified, and then carrying out the next step; if not, using a new insulated Kovar signal column and a signal leading-out wire to continuously repeat the steps (1) to (3) for re-welding;
(4) the signal outgoing line 1 is wound into a spiral shape to form a spiral part 13, so that the welding difficulty of a second end 12 to be welded of the signal outgoing line and the core wire 3 of the driving cable is reduced, the welding space is enlarged, and the outer diameter of the spiral part 13 is smaller than the inner diameter of the insulating ring; the insulating ring is positioned between the insulating kovar and the driving cable, and the inner diameter of the insulating ring is not more than 2.7 mm; meanwhile, the number of turns of the spiral part 13 is preferably two, and after the number of turns is more than that of the signal wire 1, the insulating Kovar 2 is extruded to increase the stress of welding points when being assembled, so that the service life is influenced; the number of turns is reduced and the welding difficulty is increased.
(5) Similarly, the second end to be welded 12 of the signal outgoing line is fused into a spherical end to be welded with the spherical diameter of 0.2-0.3 mm by laser welding, the end to be welded 31 of the core wire of the driving cable is also fused into a spherical end to be welded with the spherical diameter of 0.3mm, the lap joint probability is increased, the lap joint condition is improved, then the two spherical ends to be welded are butted, the welding power is adjusted to 30W, and the welding of the core wire 3 of the driving cable and the signal outgoing line 1 is completed by laser spot welding;
(6) and testing the strength of a welding spot between the driving cable core wire 3 and the signal leading-out wire 1 by using a tension meter, and if the strength of the welding spot is more than or equal to 3 pounds, welding the driving cable core wire 3 and the signal leading-out wire 1 to be qualified, so that the welding assembly between the insulated Kovar signal column 21 and the driving cable core wire 3 is completed.
In order to ensure the lapping effect, the end face of the to-be-welded end 22 of the insulated kovar signal post is preferably perpendicular to the axis of the insulated kovar signal post.
According to the test, the welding assembly of the superfine material is carried out according to the method, the lapping condition of the whole welding process is improved, the welding difficulty of the superfine material is reduced, the strength of a welding spot is ensured, meanwhile, the welding spot is ensured to work at a lower stress level in the use process after the assembly, the high-reliability assembly of the tiny and superfine parts of the miniature fission chamber is finally realized, and the accuracy of the measurement of the fluence rate is ensured.
Claims (7)
1. A welding method of a micro fission chamber superfine signal outgoing line comprises the following steps:
s1, cleaning, dehydrating and drying the whole section of the signal outgoing line, the end to be welded of the insulated Kovar signal column and the end to be welded of the core wire of the driving cable by using alcohol;
s2, fusing one end of the signal outgoing line into a spherical end to be welded by laser welding, butting the spherical end to be welded with the end face of the insulated Kovar signal column, and welding the insulated Kovar signal column and the signal outgoing line by laser spot welding;
s3, testing the strength of a welding spot between the insulated Kovar signal column and the signal leading-out wire by using a tension meter, and if the strength of the welding spot is more than or equal to 3 pounds, welding the insulated Kovar signal column and the signal leading-out wire to be qualified;
s4, winding the signal lead-out wire into a spiral shape, wherein the outer diameter of the spiral shape is smaller than the inner diameter of the insulating ring;
s5, fusing the other end of the signal outgoing line into a spherical end to be welded by laser welding, fusing the end to be welded of the core wire of the driving cable into the spherical end to be welded by laser welding, butting the two spherical ends to be welded, and welding the core wire of the driving cable and the signal outgoing line by laser spot welding;
s6, testing the strength of the welding spot between the driving cable core wire and the signal leading-out wire by using a tension meter, and if the strength of the welding spot is more than or equal to 3 pounds, welding the driving cable core wire and the signal leading-out wire to be qualified, so that the welding assembly between the insulated Kovar signal column and the driving cable core wire is completed.
2. The welding method according to claim 1, wherein the end surface to be welded of the insulated kovar signal post in step S1 is perpendicular to the axis thereof.
3. The soldering method according to claim 1, wherein in step S2, when the spherical to-be-soldered end of the signal lead wire is butted with the end face of the insulated kovar signal post, the spherical to-be-soldered end of the signal lead wire must not exceed the edge of the end face of the insulated kovar signal post.
4. The welding method according to claim 1, wherein when the spherical to-be-welded end of the signal lead wire is butted with the end face of the insulated kovar signal post in step S2, the spherical to-be-welded end of the signal lead wire is coaxial with the insulated kovar signal post, so as to ensure that the spherical to-be-welded end of the signal lead wire is located at the center of the end face of the insulated kovar signal post.
5. The welding method according to claim 1, wherein the number of turns of the signal lead wire wound in a spiral shape in step S4 is two.
6. The soldering method according to claim 1, wherein the ball diameter of the spherical to-be-soldered end of the signal lead wire in steps S2 and S5 is 0.2mm to 0.3mm, and the ball diameter of the spherical to-be-soldered end of the driving cable core wire in step S5 is 0.3 mm.
7. The welding method according to claim 1, wherein the welding power used for laser spot welding of the insulated kovar signal post and the signal lead wire in step S2 is 40W, and the welding power used for laser spot welding of the signal lead wire and the driving cable core wire in step S5 is 30W.
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| CN202210268334.1A CN114571075B (en) | 2022-03-17 | 2022-03-17 | Welding method of miniature fission chamber signal outgoing line |
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| CN202210268334.1A CN114571075B (en) | 2022-03-17 | 2022-03-17 | Welding method of miniature fission chamber signal outgoing line |
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| CN114571075B CN114571075B (en) | 2023-05-05 |
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| CN85107767A (en) * | 1985-10-15 | 1987-04-15 | 长春光学精密机械学院 | Laser welding method for bridge wire |
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| CN103549664A (en) * | 2013-08-07 | 2014-02-05 | 林光榕 | Heating wire component in electronic cigarette and welding method of heating wire component |
| CN104785925A (en) * | 2014-01-22 | 2015-07-22 | 上海亚尔光源有限公司 | Electrode molybdenum sheet assembly for ultrahigh-voltage point light source and forming method thereof |
| CN105607188A (en) * | 2016-03-09 | 2016-05-25 | 南京吉隆光纤通信股份有限公司 | Double-electrode fiber Fabry-Perot cavity welding device |
| CN113764953A (en) * | 2020-06-04 | 2021-12-07 | 泰连德国有限公司 | Soldering method for connecting a first connector and a second connector, use and connection |
-
2022
- 2022-03-17 CN CN202210268334.1A patent/CN114571075B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85107767A (en) * | 1985-10-15 | 1987-04-15 | 长春光学精密机械学院 | Laser welding method for bridge wire |
| CN102341210A (en) * | 2009-03-02 | 2012-02-01 | 德克·豪斯曼 | Method and apparatus for welding wires, including an annealing process prior to, during, or following the welding process, wires, and application of small pipe in the method |
| CN103549664A (en) * | 2013-08-07 | 2014-02-05 | 林光榕 | Heating wire component in electronic cigarette and welding method of heating wire component |
| CN104785925A (en) * | 2014-01-22 | 2015-07-22 | 上海亚尔光源有限公司 | Electrode molybdenum sheet assembly for ultrahigh-voltage point light source and forming method thereof |
| CN105607188A (en) * | 2016-03-09 | 2016-05-25 | 南京吉隆光纤通信股份有限公司 | Double-electrode fiber Fabry-Perot cavity welding device |
| CN113764953A (en) * | 2020-06-04 | 2021-12-07 | 泰连德国有限公司 | Soldering method for connecting a first connector and a second connector, use and connection |
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