CN103411983B - Plug bush type throat depth quasicompensation X-ray radiography detection method - Google Patents
Plug bush type throat depth quasicompensation X-ray radiography detection method Download PDFInfo
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- CN103411983B CN103411983B CN201310358927.8A CN201310358927A CN103411983B CN 103411983 B CN103411983 B CN 103411983B CN 201310358927 A CN201310358927 A CN 201310358927A CN 103411983 B CN103411983 B CN 103411983B
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Abstract
The invention provides a kind of plug bush type throat depth quasicompensation X-ray radiography detection method, the steps include: (a) with the arc of a piece for compensation block, the arc radius of compensation block is consistent with focal length during X-ray radiography; B () processes several compensate openings on compensation block, compensate opening diameter is 1.01 ~ 1.03 times of compensation block thickness, and the compensate opening degree of depth ensures that weld pitch compensation block Edge Distance is not less than 10mm; During (c) X ray transillumination, plug bush type weld seam is inserted in compensate opening, plug bush type weld seam and compensation block form an entirety and are placed on film, adopt the mode of center exposure to carry out transillumination, recording condition parameter is focal length 500-1000mm, exposure 15-40mAmin, shining voltage 150 ± 30kV.The inventive method makes the image quality of zones of different in compensation block consistent, and compensation block thickness is slightly less than compensate opening diameter, is effectively thinned scanning thickness, improves photograph detection sensitivity significantly, ensure that accuracy and the reliability of testing result.
Description
Technical field
The invention belongs to weld seam detection technical field, be specifically related to a kind of X-ray radiography detection method for plug bush type weld seam or bar inherent vice.
Background technology
Plug bush type weld seam belongs to bar-shaped weld seam, first end plug concave station is filled in cladding tubes during manufacture, then end plug and cladding tubes is welded together with electro-beam welding process.The bar-shaped weld seam of plug bush type adopts throat depth entirely to compensate plate photographic process usually, in this photographic process, compensation block is tabular, compensate opening is axially perpendicular to dull and stereotyped thickness direction, compensate opening diameter is much smaller than compensating plate thickness, compensate opening profile is all positioned at the inside of compensation block thickness direction, and compensation block schematic diagram is as Fig. 1.During photograph, weld seam inserts the entirety forming a consistency of thickness in compensate opening with compensation block, selects suitable conditions of exposure to take a picture, complete the detection of butt welded seam according to thickness.Throat depth compensates the deficiency that plate photographic process exists entirely, and one is that compensation block thickness is partially thick, causes taking a picture checking sensitivity on the low side; Two is adopt plate compensation block, and the scanning thickness slightly difference of in the middle part of compensation block and end, causes image quality slightly different.
Summary of the invention
The object of the present invention is to provide a kind of plug bush type throat depth quasicompensation X-ray radiography detection method, which solve the partially thick inspection sensitivity that causes taking a picture of compensation block thickness on the low side with problems different with the image quality that the scanning thickness difference of end causes in the middle part of compensation block.
Realize the technical scheme of the object of the invention: a kind of plug bush type throat depth quasicompensation X-ray radiography detection method, its commissure is solid pole or the center pole with micropore, and the method comprises the steps:
A (), with the arc of a block length 50mm ~ 200mm, wide 30mm ~ 100mm, thick 3 ~ 15mm for compensation block, the arc radius of this compensation block is consistent with focal length during X-ray radiography;
B () processes several compensate openings on compensation block, be specially: be of a size of benchmark with plug bush type weld bead outer diameter, with the mid point of thickness of slab for basic point processes compensate opening, compensate opening diameter is 1.01 ~ 1.03 times of compensation block thickness; The compensate opening degree of depth ensures that weld pitch compensation block Edge Distance is not less than 10mm;
During (c) X ray transillumination, inserted in compensate opening by plug bush type weld seam, plug bush type weld seam and compensation block form an entirety and are placed on film, identification marking are placed on position compensation block not having weld seam, now the scanning thickness of whole piece weld seam is consistent substantially, scanning thickness than K close to 1; Adopt the mode of center exposure to carry out transillumination, the focus of x-ray source is positioned at the center of circle of arc compensation block, ensure that arc compensation block is arranged in transillumination field, recording condition parameter is focal length 500-1000mm, exposure 15-40mAmin, shining voltage 150 ± 30kV.
A kind of plug bush type weld seam cladding tubes as above and end plug throat depth quasicompensation X-ray radiography detection method, the material of the compensation block described in it must be close with tested material or identical.
A kind of plug bush type weld seam cladding tubes as above and end plug throat depth quasicompensation X-ray radiography detection method, the machining precision of the compensate opening described in it controls at 0.05mm ~ 0.15mm, and hole inwall smooth finish is not less than 3.2 μm.
A kind of plug bush type weld seam cladding tubes as above and end plug throat depth quasicompensation X-ray radiography detection method, its X-ray production apparatus adopted is directed or circumferential X-ray production apparatus, high voltage adjusting scope is 10 ~ 450kV, and Current adjustment scope is 0 ~ 10mA, and voltage, electric current can regulate continuously.
Effect of the present invention is: the structural design of compensation block, according to plug bush type welding line structure feature and detection technique requirement, is arc by the present invention, have employed center exposure technology, makes the image quality of zones of different in compensation block consistent; Make compensation block thickness be slightly less than compensate opening diameter, be effectively thinned scanning thickness, improve photograph detection sensitivity significantly, ensure that accuracy and the reliability of testing result.
Accompanying drawing explanation
Fig. 1 is plate compensation block schematic diagram;
Fig. 2 is arc compensation block structural representation of the present invention;
Fig. 3 is plug bush type throat depth quasicompensation X-ray radiography detection method schematic diagram of the present invention;
In figure: 1-compensation block; 2-compensate opening; 3-plug bush type weld seam; 4-identification marking; 5-x-ray source (transillumination field).
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of plug bush type cladding tubes of the present invention and end plug throat depth quasicompensation X-ray radiography detection method are further described.
As shown in Figure 2 or Figure 3, a kind of plug bush type cladding tubes of the present invention and end plug throat depth quasicompensation X-ray radiography detection method, it comprises the steps:
A () as shown in Figure 2, with the arc airconium alloy plates of a block length 100mm, wide 50mm, thick 8mm for compensation block 1, the arc radius of this compensation block 1 is consistent with focal length during X-ray radiography;
B () as shown in Figure 2, compensation block 1 processes the compensate opening 2 of 5 ~ 20 (such as: 5,10 or 20) equal diameters, its with plug bush type weld seam 3 outside dimension be benchmark, with the mid point of thickness of slab for basic point processing compensate opening 2; Compensate opening 2 diameter is 1.03 times of compensation block 1 thickness; Compensate opening 2 degree of depth ensures that girth joint is not less than 10mm apart from compensation block Edge Distance.(machining precision of compensate opening controls at 0.05mm ~ 0.15mm, and hole inwall smooth finish is not less than 3.2 μm)
C () as shown in Figure 3, when X ray detects weld seam transillumination, plug bush type weld seam 3 is inserted in compensate opening 2, plug bush type weld seam 3 and compensation block 1 form an entirety and are placed on film, identification marking 4 is placed on the position not having weld seam in compensation block 1, now the scanning thickness of whole piece weld seam is consistent substantially, scanning thickness than K close to 1; The mode of center exposure is adopted to carry out transillumination, the focus of x-ray source 5 is positioned at the center of circle of arc compensation block, ensure that arc compensation block is arranged in transillumination field, recording condition parameter is focal length 800mm(numerical range), exposure 25mAmin(numerical range), shining voltage 160kV.
The present invention compensates the deficiency of plate photographic process existence entirely mainly for throat depth, carry out reduction scanning thickness conceptual design, and according to radiography principle, by improving compensation block shape, eliminate problems different with end image quality in the middle part of compensation block.Wherein, length 50mm ~ 200mm, width 30mm ~ 100mm, the thickness 3 ~ 15mm of compensation block 1; Compensate opening 2 diameter is 1.01 ~ 1.03 times of compensation block 1 thickness; Recording condition parameter is focal length 500 ~ 1000mm, exposure 15 ~ 40mAmin, shining voltage 150 ± 30kV.
The present invention uses the advantage of arc compensation block, and one is that the thickness of compensation block reduces 20%, and relative sensitivity improves 0.5%; Two is that the radius of arc compensation block is consistent with X-ray radiography focal length, and adopt center exposure mode, in compensation block, the scanning thickness in arbitrary region is all identical, is conducive to obtaining identical photographic quality.Throat depth quasicompensation arc compensation block photographic process successfully solves the deficiency that throat depth compensates the existence of plate photographic process entirely, improves radiographic X sensitivity and image quality significantly, ensure that the accuracy that radiography detects and reliability.
Claims (4)
1. a plug bush type throat depth quasicompensation X-ray radiography detection method, its commissure be solid pole or center with the pole of micropore, it is characterized in that: the method comprises the steps:
A (), with the arc of a block length 50mm ~ 200mm, wide 30mm ~ 100mm, thick 3 ~ 15mm for compensation block (1), the arc radius of this compensation block (1) is consistent with focal length during X-ray radiography;
B () is at compensation block (1) several compensate openings of upper processing (2), be specially: with plug bush type weld seam (3) outside dimension be benchmark, with the mid point of thickness of slab for basic point processes compensate opening (2), compensate opening (2) diameter is 1.01 ~ 1.03 times of compensation block (1) thickness; Compensate opening (2) degree of depth ensures that weld pitch compensation block Edge Distance is not less than 10mm;
During (c) X ray transillumination, plug bush type weld seam (3) is inserted in compensate opening (2), plug bush type weld seam (3) and compensation block (1) form an entirety and are placed on film, identification marking (4) is placed on position compensation block (1) not having weld seam, now the scanning thickness of whole piece weld seam is consistent substantially, and scanning thickness is 1 than K; The mode of center exposure is adopted to carry out transillumination, the focus of x-ray source (5) is positioned at the center of circle of arc compensation block, ensure that arc compensation block is arranged in transillumination field, recording condition parameter is focal length 500 ~ 1000mm, exposure 15 ~ 40mAmin, shining voltage 150 ± 30kV.
2. a kind of plug bush type throat depth quasicompensation X-ray radiography detection method according to claim 1, it is characterized in that, the material of described compensation block (1) must be close with tested material or identical.
3. a kind of plug bush type throat depth quasicompensation X-ray radiography detection method according to claim 1, it is characterized in that, the machining precision of described compensate opening (2) controls at 0.05mm ~ 0.15mm, and hole inwall smooth finish is not less than 3.2 μm.
4. a kind of plug bush type throat depth quasicompensation X-ray radiography detection method according to claim 1, it is characterized in that, the X-ray production apparatus that the method adopts is directed or circumferential X-ray production apparatus, high voltage adjusting scope is 10 ~ 450kV, Current adjustment scope is 0 ~ 10mA, and voltage, electric current can regulate continuously.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105699403B (en) * | 2016-01-28 | 2020-03-17 | 山西航天清华装备有限责任公司 | Arrangement method for detecting vertical transillumination by directional X-ray |
| CN109727692B (en) * | 2018-12-29 | 2022-08-19 | 中核北方核燃料元件有限公司 | Automatic compensation device for X-ray detection of welding seam of end plug of fuel rod |
| CN109932375B (en) * | 2019-04-23 | 2023-08-08 | 中国石油天然气集团有限公司 | Digital imaging detection method for calibrating DR long-focal-length transillumination sensitivity of thick weld seam of tube plate |
| CN110618147B (en) * | 2019-10-25 | 2022-07-05 | 东方电气集团东方锅炉股份有限公司 | System and method for measuring height of incomplete penetration defect of tube-tube plate fillet weld |
| CN112525930A (en) * | 2020-12-08 | 2021-03-19 | 中国工程物理研究院材料研究所 | Defect measuring device and method based on X-ray real-time imaging |
| CN113390903A (en) * | 2021-06-10 | 2021-09-14 | 中国核电工程有限公司 | Online detection device and method for welding seam of end plug of nuclear fuel rod |
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| 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 |
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| 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 |
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