CN103411983A - Half-compensation X-radiographic testing method for thicknesses of inserting-bushing type welding lines - Google Patents
Half-compensation X-radiographic testing method for thicknesses of inserting-bushing type welding lines Download PDFInfo
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- CN103411983A CN103411983A CN2013103589278A CN201310358927A CN103411983A CN 103411983 A CN103411983 A CN 103411983A CN 2013103589278 A CN2013103589278 A CN 2013103589278A CN 201310358927 A CN201310358927 A CN 201310358927A CN 103411983 A CN103411983 A CN 103411983A
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Abstract
The invention provides a half-compensation X-radiographic testing method for the thicknesses of inserting-bushing type welding lines. The method comprises the following steps: (a) selecting an arc-shaped plate as a compensation block, wherein the arc radius of the compensation block is accordant with the focal length during a X-radiographic process; (2) machining a plurality of compensation holes in the compensation block, wherein the diameter of each compensation hole is 1.01-1.03 times the thickness of the compensation block, and the distances from the welding lines to the edge of the compensation block are not less than 10mm by virtue of the depths of the compensation holes; (3) inserting the inserting-bushing type welding lines into the compensation holes during an X-ray transillumination process, putting an integral body formed by the inserting-bushing type welding lines and the compensation block on a film, and carrying out transillumination in a central exposure manner, wherein the radiographic condition parameters are that the focal length is 500-1000 mm, the quantity of exposure is 15-40 mA.min, and the transillumination voltage is 150+/-30 kV. According to the method disclosed by the invention, the imaging qualities of different regions in the compensation block are accordant; as the thickness of the compensation block is slightly smaller than the diameter of each compensation hole, the transillumination thickness is effectively reduced, the radiographic sensitivity is greatly improved, and the accuracy and reliability of a detection result are guaranteed.
Description
Technical field
The invention belongs to the 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
The plug bush type weld seam belongs to bar-shaped weld seam, first the end plug concave station is filled in to cladding tubes during manufacture, then with electro-beam welding process, end plug and cladding tubes is welded together.The bar-shaped weld seam of plug bush type adopts the plate photographic process of the full compensation of throat depth usually, in this photographic process, compensation block is tabular, compensate opening is axially perpendicular to dull and stereotyped thickness direction, the compensate opening diameter is much smaller than compensating plate thickness, the compensate opening profile all is positioned at the inside of compensation block thickness direction, compensation block schematic diagram such as Fig. 1.During photograph, weld seam inserts the integral body that forms a consistency of thickness in compensate opening with compensation block, selects suitable conditions of exposure to take a picture according to thickness, completes the detection of butt welded seam.The deficiency that the plate photographic process of the full compensation of throat depth exists, the one, compensation block thickness is partially thick, and the check sensitivity that causes taking a picture is on the low side; The 2nd, adopt plate compensation block, the transillumination thickness of compensation block middle part and end is slightly variant, 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, it has solved the partially thick check sensitivity different problem of image quality caused with compensation block middle part and the transillumination difference in thickness of end on the low side that causes taking a picture of compensation block thickness.
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 are solid pole or the center pole with micropore, and the method comprises the steps:
(a) take the arc of a block length 50mm～200mm, wide 30mm～100mm, thick 3～15mm is compensation block, the arc radius of this compensation block during with X-ray radiography focal length consistent;
(b) several compensate openings of processing on compensation block are specially: the plug bush type weld seam outside dimension of take is basic point processing compensate opening as benchmark, the mid point of thickness of slab of take, and the compensate opening diameter is 1.01～1.03 times of compensation block thickness; The compensate opening degree of depth guarantees that weld pitch compensation block Edge Distance is not less than 10mm;
(c) during the X ray transillumination, the plug bush type weld seam is inserted in compensate opening, and plug bush type weld seam and compensation block form an integral body and are placed on film, identification marking are placed on compensation block to the position that there is no weld seam, now the transillumination thickness of whole piece weld seam is consistent substantially, and transillumination Thickness Ratio K is close to 1; Adopt the mode of center exposure to carry out transillumination, the focus of x-ray source is positioned to the center of circle of arc compensation block, guarantee that the arc compensation block is arranged in the transillumination field, the 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 its described compensation block 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 its described compensate opening is controlled at 0.05mm～0.15mm, and hole inwall smooth finish is not less than 3.2 μ m.
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, the high voltage adjusting scope is 10～450kV, and the electric current range of adjustment is 0～10mA, and voltage, electric current can be regulated continuously.
Effect of the present invention is: the present invention, according to plug bush type welding line structure characteristics and detection technique requirement, is arc by the structural design of compensation block, has adopted the center exposure technology, makes in compensation block the image quality of zones of different consistent; Make compensation block thickness be slightly less than the compensate opening diameter, effectively attenuate transillumination thickness, improved significantly the photograph detection sensitivity, guaranteed accuracy and the reliability of testing result.
The 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, the arc airconium alloy plates of a block length 100mm, wide 50mm, thick 8mm of take is compensation block 1, the arc radius of this compensation block 1 during with X-ray radiography focal length consistent;
(b) as shown in Figure 2, on compensation block 1, process the compensate opening 2 of 5～20 (for example: 5,10 or 20) equal diameters, it be take plug bush type weld seam 3 outside dimensions and is basic point processing compensate opening 2 as benchmark, the mid point of thickness of slab of take; Compensate opening 2 diameters are 1.03 times of compensation block 1 thickness; Compensate opening 2 degree of depth guarantee that girth joint is not less than 10mm apart from the compensation block Edge Distance.(machining precision of compensate opening is controlled at 0.05mm～0.15mm, and hole inwall smooth finish is not less than 3.2 μ m)
(c) as shown in Figure 3, when X ray detects the 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 integral body and are placed on film, identification marking 4 is placed on to the position that there is no weld seam in compensation block 1, now the transillumination thickness of whole piece weld seam is consistent substantially, and transillumination Thickness Ratio K is close to 1; Adopt the mode of center exposure to carry out transillumination, the focus of x-ray source 5 is positioned to the center of circle of arc compensation block, guarantee that the arc compensation block is arranged in the transillumination field, the recording condition parameter is focal length 800mm(numerical range), exposure 25mAmin(numerical range), shining voltage 160kV.
The deficiency that the present invention exists mainly for the plate photographic process of the full compensation of throat depth, carried out reduction transillumination thickness conceptual design, and, according to the radiography principle, by the compensation block shape is improved, eliminated the compensation block middle part problem different with the end image quality.Wherein, the length 50mm of compensation block 1～200mm, width 30mm～100mm, thickness 3～15mm; Compensate opening 2 diameters are 1.01～1.03 times of compensation block 1 thickness; The 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, the one, the thickness reduction of compensation block 20%, relative sensitivity has improved 0.5%; The 2nd, the radius of arc compensation block is consistent with the X-ray radiography focal length, adopts the center exposure mode, and in compensation block, the transillumination thickness in arbitrary zone is all identical, is conducive to obtain identical photographic quality.Throat depth quasicompensation arc compensation block photographic process has successfully solved the deficiency that the plate photographic process of the full compensation of throat depth exists, and has improved significantly radiographic X sensitivity and image quality, has guaranteed accuracy and reliability that radiography detects.
Claims (4)
1. 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) take the arc of a block length 50mm～200mm, wide 30mm～100mm, thick 3～15mm is compensation block (1), the arc radius of this compensation block (1) during with X-ray radiography focal length consistent;
(b) at the upper processing of compensation block (1) several compensate openings (2), be specially: plug bush type weld seam (3) outside dimension of take is basic point processing compensate opening (2) as benchmark, the mid point of thickness of slab of take, and compensate opening (2) diameter is 1.01～1.03 times of compensation block (1) thickness; Compensate opening (2) degree of depth guarantees that weld pitch compensation block Edge Distance is not less than 10mm;
(c) during the 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 integral body and are placed on film, identification marking (4) is placed on to the position that there is no weld seam on compensation block (1), now the transillumination thickness of whole piece weld seam is consistent substantially, and transillumination Thickness Ratio K is close to 1; Adopt the mode of center exposure to carry out transillumination, the focus of x-ray source (5) is positioned to the center of circle of arc compensation block, guarantee that the arc compensation block is arranged in the transillumination field, the recording condition parameter is focal length 500-1000mm, exposure 15-40mAmin, shining voltage 150 ± 30kV.
2. a kind of plug bush type weld seam cladding tubes according to claim 1 and end plug throat depth quasicompensation X-ray radiography detection method, 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 weld seam cladding tubes according to claim 1 and end plug throat depth quasicompensation X-ray radiography detection method, it is characterized in that, the machining precision of described compensate opening (2) is controlled at 0.05mm～0.15mm, and hole inwall smooth finish is not less than 3.2 μ m.
4. a kind of plug bush type weld seam cladding tubes according to claim 1 and end plug throat depth quasicompensation X-ray radiography detection method, it is characterized in that, the X-ray production apparatus that the method adopts is directed or circumferential X-ray production apparatus, the high voltage adjusting scope is 10～450kV, the electric current range of adjustment is 0～10mA, and voltage, electric current can be regulated continuously.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699403A (en) * | 2016-01-28 | 2016-06-22 | 长治清华机械厂 | Arrangement method for detecting vertical transillumination by orientation X rays |
| CN109727692A (en) * | 2018-12-29 | 2019-05-07 | 中核北方核燃料元件有限公司 | A kind of autocompensation installation for fuel rod end plug X-ray detection of welding |
| CN109932375A (en) * | 2019-04-23 | 2019-06-25 | 中国石油天然气集团有限公司 | Tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method |
| CN110618147A (en) * | 2019-10-25 | 2019-12-27 | 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699403A (en) * | 2016-01-28 | 2016-06-22 | 长治清华机械厂 | Arrangement method for detecting vertical transillumination by orientation X rays |
| CN109727692A (en) * | 2018-12-29 | 2019-05-07 | 中核北方核燃料元件有限公司 | A kind of autocompensation installation for fuel rod end plug X-ray detection of welding |
| 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 |
| CN109932375A (en) * | 2019-04-23 | 2019-06-25 | 中国石油天然气集团有限公司 | Tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method |
| 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 |
| CN110618147A (en) * | 2019-10-25 | 2019-12-27 | 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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