CN114505584A - Welding method for miniature fission chamber air extraction adapter and air extraction pipe - Google Patents
Welding method for miniature fission chamber air extraction adapter and air extraction pipe Download PDFInfo
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- CN114505584A CN114505584A CN202210274580.8A CN202210274580A CN114505584A CN 114505584 A CN114505584 A CN 114505584A CN 202210274580 A CN202210274580 A CN 202210274580A CN 114505584 A CN114505584 A CN 114505584A
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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
Abstract
The invention provides a welding method for a miniature fission chamber air extraction adaptor and an air extraction pipe, and aims to solve the problems that the miniature fission chamber air extraction adaptor and the air extraction pipe are small in size, a welding end face is narrow, a trial welding space is small, a to-be-welded part is thin in wall and easy to weld through and weld through, obvious deformation is easy to occur after welding, and subsequent assembly and leakage rate test cannot be guaranteed. The method comprises the following steps: and testing the welding depth, determining welding parameters, assembling the parts to be welded to ensure the clearance of the end faces to be welded, performing laser welding on a circumference of not less than 360 degrees, and detecting the leakage of welding points. The welding method not only ensures that the pumping adaptor and the exhaust tube do not have overbeld, penetration and deformation under the miniature size, but also solves the problems of high welding assembly difficulty and the like of the pumping adaptor and the exhaust tube, ensures that the leakage rate of a welding spot meets the design requirement, has accurate measurement of the neutron fluence rate, and realizes the miniaturization and the localization of the fission chamber.
Description
Technical Field
The invention belongs to the field of welding of miniature devices, and particularly relates to a welding method for an air pumping adaptor and an air pumping pipe of a miniature fission chamber.
Background
The micro fission chamber is one of important components of a reactor core measuring system and is mainly used for measuring the neutron fluence rate of a reactor core. Due to the harsh use conditions and strict parameter requirements, the micro fission chamber has high design and manufacturing difficulty, and particularly relates to the micro parts with high end face sealing requirements and high assembly difficulty. Therefore, the micro fission chamber mainly depends on import, and although products exist in China, the micro fission chamber is rarely applied.
In 2019, a middle and wide nuclear research institute, combined with the institute of nuclear physics and chemistry of the Chinese institute of engineering and physics, develops a miniature fission chamber neutron detector for a CPR1000 reactor, and is mainly used for monitoring the thermal neutron flux in the reactor. In order to facilitate the overall miniaturization of the miniature fission chamber, a pumping adaptor and a pumping pipe in the fission chamber need to be designed in a miniature way. In order to ensure the utilization rate of the space in the miniature fission chamber, an assembly mode for improving the space utilization rate, such as glue seal assembly and welding seal assembly, must be adopted. However, the glue seal assembly is not suitable for the high-temperature environment of the reactor, and the seal failure is easily caused. The following problems are also faced when the welding and sealing assembly mode is assembled: firstly, the air exhaust adaptor is a stepped rotary part, the size of the air exhaust adaptor is small, the maximum outer diameter is 3.7mm, the thickness is 2.0mm, the outer diameter of the position needing welding assembly is 2.7mm, the inner diameter is 1.2mm, the wall thickness is 0.75mm, the axial size of the section is only 0.5mm, the diameter of the air exhaust pipe is 1.2mm, the inner diameter is 0.8mm, and the pipe wall is only 0.2mm thick; the two parts to be welded are small in size, the welding space between the end surface to be welded of the exhaust pipe and the end surface to be welded of the adapter is only a circular ring with the diameter of 1.2mm and the width of less than 0.05mm, and the welding space is limited. Secondly, the wall of the to-be-welded part is thin and easy to weld through, or the adapter or the sealing end face is deformed due to over-welding, or the welding spot height is too high due to over-welding, the assembly of the subsequent leak detection tool cannot be guaranteed to influence the leak rate test or the welding assembly leak rate test is unqualified due to the deformation of the adapter or the sealing end face and the over-welding, and further the subsequent assembly of the miniature fission chamber cannot be guaranteed. Finally, if the welding depth is insufficient due to improper welding parameters, the connection strength and the gas leakage rate of the welding end face of the air exhaust adapter and the air exhaust pipe are affected.
In order to ensure subsequent assembly and leak rate test and ensure the measurement precision of the miniature fission chamber, a set of welding assembly process or method needs to be designed aiming at the miniature air pumping adapter and the air pumping pipe.
Disclosure of Invention
To achieve the purpose, a welding method for a miniature fission chamber pumping adaptor and a pumping tube is provided:
a welding method for a miniature fission chamber pumping adaptor and a pumping tube comprises the following steps:
s1, setting different laser welding powers and welding sample pieces;
s2, performing ray detection on the welding sample pieces, testing the welding depth of each sample piece, detecting the gas leakage rate of the welding sample pieces which accord with the designed welding depth H, and selecting the welding power and the welding speed which correspond to the sample pieces which accord with the designed welding depth H and the gas leakage rate as welding parameters;
s3, coaxially inserting the air exhaust pipe into the air exhaust adapter to enable the end face to be welded to be flush with the end face to be welded of the air exhaust adapter, and ensuring that the radial clearance between the two end faces to be welded is less than or equal to 0.05 mm;
s4, laser welding the air exhaust adapter and the air exhaust pipe according to the welding parameters determined in the step S2;
s5, detecting the air leakage rate of the welded part, if the air leakage rate is less than or equal to 1.5 multiplied by 10-13pa·m3And the product is qualified in terms of/s.
Preferably, in step S2, the designed welding depth H is 0.5mm to 0.6mm, and the welding power corresponding to the designed welding depth H is 30W to 40W.
Preferably, the laser welding in step S4 is circumferential welding at a welding speed of 0.5 mm/S.
Preferably, the welding width of the laser welding in step S4 is > 360 °.
Preferably, the welding width of the laser welding in step S4 is 361 degrees or more.
The beneficial effects of the invention are as follows: (1) the method can realize the welding assembly of the thin-wall and miniature air extraction adapter and the air extraction pipe. The welding depth is stable, the welding spot height is suitable in the whole welding assembly process, no cylinder wall is welded through, no excessive welding is carried out, no deformation exists on a workpiece to be welded, a welded part is easily assembled with a leakage detection tool, leakage detection test is completed, the gas leakage rate meets the design requirement, and the follow-up assembly requirement can be met. (2) The welding assembly method of the air pumping adaptor and the air pumping pipe not only ensures the high-quality assembly of the air pumping adaptor and the air pumping pipe, but also ensures the miniaturization of the miniature fission chamber and the accurate measurement of the fluence rate. (3) The method has the advantages of welding speed of 0.5mm/s, high forming speed of the welding line and high assembly efficiency.
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 view of a suction adapter;
FIG. 2 is a schematic view of the pump tube;
FIG. 3 is a schematic view of a weld assembly;
in the figure: 1. the welding method comprises the following steps of (1) air suction adapter, 2, an air suction pipe schematic diagram, 3, a circular seam, 11, a first end surface to be welded, 12, a first inner surface of the air suction adapter, 13, a first outer surface of the air suction adapter, 14, a second outer surface of the air suction adapter, 15, a third outer surface of the air suction adapter, 16 and a second inner surface of the air suction adapter; 21. and the second end surface to be welded.
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
Figures 1 and 2 show the pump-down adaptor and pump-down tube, respectively, for use in a miniature fission chamber neutron detector for a CPR1000 reactor. Wherein the adaptor 1 of bleeding is the ladder solid of revolution part, and its size is little, and specific parameter is: the biggest external diameter is located the adaptor second surface 14 department of bleeding and is 3.7mm, the minimum external diameter is located the adaptor first surface 13 department of bleeding and is 2.7mm, the adaptor third surface 15 external diameter of bleeding is 3.1mm, the adaptor first internal surface 12 internal diameter of bleeding is 1.2mm, 16 internal diameters of the adaptor second internal surface of bleeding are 2.4mm, the adaptor first surface 13 of bleeding and the adaptor second external surface 14 axial thickness of bleeding are 0.5mm, the whole axial thickness of the adaptor of bleeding is 2.0 mm. The wall thickness at the first end face to be welded 11 is only 0.75 mm. The external diameter of the air exhaust pipe 2 is 1.3mm, the internal diameter is 0.8mm, and the pipe wall is only 0.25mm thick. The end surfaces to be welded are the first end surface to be welded 11 and the second end surface to be welded 21.
From the overall size, the air exhaust adaptor 1 and the air exhaust pipe 2 are small in size, only the end face to be welded of the air exhaust pipe 2 and the end face to be welded of the adaptor are circular seams with the diameter of 1.2mm and the width of less than 0.05mm, and the welding space is limited. Secondly, the air exhaust adaptor 1 and the air exhaust pipe 2 are thin in wall and easy to weld through, or the adaptor or the sealing end face is deformed due to over-welding, or the welding spot height is too high due to over-welding, the assembly of the subsequent leak detection tool cannot be guaranteed to influence the leak rate test or the welding assembly leak rate test is unqualified due to the deformation of the adaptor or the sealing end face and the too high welding spot height due to over-welding, and further the subsequent assembly of the miniature fission chamber cannot be guaranteed. Finally, if the welding depth is insufficient due to improper welding parameters, the connection strength and the gas leakage rate of the welding end face of the air exhaust adapter and the air exhaust pipe are affected.
In order to ensure subsequent assembly and leakage rate test and ensure the measurement precision of the miniature fission chamber, the miniature pumping adaptor and the pumping pipe are welded and assembled according to the following steps:
(1) processing a plurality of air exhaust adapters and air exhaust pipes according to a design drawing;
(2) according to different laser welding powers of 20W, 25W, 30W, 35W, 40W, 45W, 50W and the like, parameter combination is carried out at different welding speeds of 0.3mm/s, 0.35mm/s, 0.4mm/s, 0.45m/s, 0.50mm, 0.55mm/s, 0.6mm/s and the like, welding, sealing and trial welding are carried out on an air suction adapter and an air suction pipe, and a plurality of welding sample pieces are obtained;
(3) detecting the sample pieces by RT detection (ray detection), testing the welding depth of each welding sample piece, detecting the air leakage rate if the welding depth is in the range of 0.5 mm-0.6 mm, and if the air leakage rate is less than or equal to 1.5 multiplied by 10-13pa·m3The product is qualified in terms of/s; using the laser welding power of 30-40W and the welding speed of 0.5mm/s corresponding to the qualified welding sample piece as welding parameters;
(4) coaxially inserting an exhaust pipe into the exhaust adapter to enable the end face to be welded to be flush with the end face to be welded of the exhaust adapter, and ensuring that the radial clearance between the two end faces to be welded is less than or equal to 0.05 mm;
(5) performing circumferential 360-degree laser welding on the air exhaust adapter and the air exhaust pipe according to the laser welding power of 30-40W and the welding speed of 0.5 mm/s; the welding amplitude should be 361 ° or more for ensuring the welding quality.
(6) Detecting the air leakage rate of the welding part, if the air leakage rate is less than or equal to 1.5 multiplied by 10-13Pa·m3And the product is qualified if the product is in the second pass range, or the product is not qualified if the product is not in the second pass range.
Through survey, carry out welding seal assembly according to above parameter, welding depth is stable, the solder joint height is suitable in whole welding assembly process, and the wall of a tube welds through, the welding of no excess, waits that the weldment does not have the deformation, and the postweld part assembles with the leak hunting frock easily, accomplishes the leak hunting test to the gas leakage rate accords with the design requirement, can satisfy follow-up assembly requirement. The high-quality assembly of the air exhaust adaptor and the air exhaust pipe and the accurate measurement of the actual injection rate are guaranteed, and the miniaturization and the localization of the fission chamber are realized.
Claims (5)
1. A welding method for a miniature fission chamber pumping adaptor and a pumping tube is characterized by comprising the following steps:
s1, setting different laser welding powers and welding speeds, and welding the sample piece;
s2, carrying out ray detection on the welding sample pieces, testing the welding depth of each sample piece, carrying out air leakage rate detection on the welding sample pieces which accord with the designed welding depth H, and selecting the welding power and the welding speed corresponding to the sample pieces which accord with the designed welding depth H and the air leakage rate as welding parameters;
s3, coaxially inserting the air exhaust pipe into the air exhaust adapter to enable the end face to be welded to be flush with the end face to be welded of the air exhaust adapter, and ensuring that the radial clearance between the two end faces to be welded is less than or equal to 0.05 mm;
s4, laser welding the air exhaust adapter and the air exhaust pipe according to the welding parameters determined in the step S2;
s5, detecting the air leakage rate of the welded part, if the air leakage rate is less than or equal to 1.5 multiplied by 10-13Pa·m3And the product is qualified in terms of/s.
2. The welding method according to claim 1, wherein the welding depth H is designed to be 0.5mm to 0.6mm in step S2, and the detection criteria of the air leakage rate are as follows: the air leakage rate of the welding part is less than or equal to 1.5 multiplied by 10-13Pa·m3And the/s is qualified.
3. The welding method according to claim 1, wherein the laser welding in step S4 is a circumferential welding, the welding power is 30W to 40W, and the welding speed is 0.5 mm/S.
4. The welding method according to claim 1, wherein the welding amplitude of the laser welding in step S4 is > 360 °.
5. The welding method according to claim 4, wherein the welding width of the laser welding in step S4 is 361 ° or more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210274580.8A CN114505584B (en) | 2022-03-17 | 2022-03-17 | Welding method for micro fission chamber air extraction adapter and air extraction pipe |
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| CN202210274580.8A CN114505584B (en) | 2022-03-17 | 2022-03-17 | Welding method for micro fission chamber air extraction adapter and air extraction pipe |
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| CN114505584B CN114505584B (en) | 2023-05-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101905380A (en) * | 2010-08-13 | 2010-12-08 | 中国航空工业集团公司北京航空制造工程研究所 | Method for determining full penetration laser welding process parameter of sheet |
| CN105643104A (en) * | 2016-03-04 | 2016-06-08 | 上海空间推进研究所 | Laser welding method for precisely controlling weld penetration |
| CN106624312A (en) * | 2016-12-31 | 2017-05-10 | 广州三五汽车部件有限公司 | Method for determining spot welding process parameters of multilayer aluminium plating steel plate |
| CN111889893A (en) * | 2020-07-07 | 2020-11-06 | 江苏海洋大学 | Ultrashort pulse laser precision machining method for dry gas sealed micron-sized groove |
| CN113203641A (en) * | 2021-03-25 | 2021-08-03 | 武汉钢铁有限公司 | Processing parameter determination method, sample processing method, device and equipment |
-
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- 2022-03-17 CN CN202210274580.8A patent/CN114505584B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905380A (en) * | 2010-08-13 | 2010-12-08 | 中国航空工业集团公司北京航空制造工程研究所 | Method for determining full penetration laser welding process parameter of sheet |
| CN105643104A (en) * | 2016-03-04 | 2016-06-08 | 上海空间推进研究所 | Laser welding method for precisely controlling weld penetration |
| CN106624312A (en) * | 2016-12-31 | 2017-05-10 | 广州三五汽车部件有限公司 | Method for determining spot welding process parameters of multilayer aluminium plating steel plate |
| CN111889893A (en) * | 2020-07-07 | 2020-11-06 | 江苏海洋大学 | Ultrashort pulse laser precision machining method for dry gas sealed micron-sized groove |
| CN113203641A (en) * | 2021-03-25 | 2021-08-03 | 武汉钢铁有限公司 | Processing parameter determination method, sample processing method, device and equipment |
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