CN214408751U - Resolution test piece for tube-tube plate welding seam ray detection resolution measurement - Google Patents
Resolution test piece for tube-tube plate welding seam ray detection resolution measurement Download PDFInfo
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- CN214408751U CN214408751U CN202022809055.0U CN202022809055U CN214408751U CN 214408751 U CN214408751 U CN 214408751U CN 202022809055 U CN202022809055 U CN 202022809055U CN 214408751 U CN214408751 U CN 214408751U
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Abstract
The utility model provides a tube-tube sheet welding seam ray detection resolution ratio measurement's resolution ratio test block. The utility model provides a resolution ratio test block size of resolution ratio measuring usefulness is small and exquisite, the processing cost is low, the commonality is strong, convenient to use. According to the utility model discloses use this test block can measure pipe-tube sheet welding seam ray detection's system resolution and the image resolution of different positions. Through simple mathematical transformation, the unsharpness and the resolution of the pipe-pipe plate welding seam ray detection at different positions can be calculated.
Description
Technical Field
The utility model relates to a nondestructive test field, concretely relates to tube-tube sheet welding seam radiographic testing test piece for resolution ratio measurement and utilize this test piece to measure the method of radiographic testing resolution ratio.
Background
In the fields of heat exchange devices, steam generators, heaters and the like, a welded structure of a tube and a tube plate is mostly involved and is a key process of a manufacturing process. The pipe orifice joint bears the load of high temperature, high pressure and the like on the pipe for a long time, and has the effects of repeated heating, repeated cooling and medium corrosion fatigue strength damage, so the requirements on the compactness and the mechanical property of a welding seam are strict. Therefore, the quality of the welding of the pipe orifice is extremely important to be checked. The welding quality of the tube-tube sheet weld affects the service life of the heat exchange device to a large extent. Particularly in the nuclear power field, the steam generator is more harsh in application conditions, has higher requirements on welding of a tube and a tube plate, and needs to carry out comprehensive detection on a welding seam to ensure that the steam generator can normally work at high temperature and high pressure.
In order to verify the welding quality of the tube-tube plate welding seam, penetration detection and ray detection are mostly adopted at present. The sensitivity of the ray detection is ensured to meet the detection requirement by adopting the sensitivity identification test according to the current production practice experience. In the sensitivity identification test, different sensitivity grades are represented by machining small holes with different specifications on the surface of the welding seam of the welding sample of the tube-tube plate welding seam. The method has high cost, low efficiency and poor universality, can only verify the detection sensitivity of the pore volume type defects on the surface of the workpiece, and cannot measure the system resolution, the image resolution, the unsharpness and the resolution of the radiographic inspection of the tube-tube plate welding line at different positions.
Therefore, a method for measuring the ray detection resolution is urgently needed to ensure that the performances of the system resolution, the image resolution, the unsharpness, the resolution and the like of the ray detection of the tube-tube plate welding line of the tube-type heat exchange device such as a steam generator and the like meet the detection requirements.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a resolution test piece for measuring the resolution of the radiographic inspection of the tube-tube sheet weld. This resolution ratio test block convenient to use, the commonality is strong, can measure ray detection system's system resolution ratio and a plurality of different detected position's image resolution ratio, unsharpness and resolution, thereby accomplish the utility model discloses.
An object of the first aspect of the present invention is to provide a resolution test piece for measuring the measurement of the tube-tube sheet weld seam radiographic testing resolution, the resolution test piece having a plurality of groove pairs.
The second aspect of the present invention is to provide a method for measuring the tube-tube plate weld seam radiographic testing resolution. The method utilizes a resolution test piece to carry out measurement, and specifically comprises the following steps:
and 3, analyzing the detection result and calculating the resolution.
The beneficial effects of the utility model include:
(1) the utility model provides a resolution ratio test block size is small and exquisite, the commonality is strong, the processing cost is low, facilitate the use, the dismouting is nimble, can also the adjusting position to can measure the resolution ratio of a plurality of different detection positions.
(2) The utility model provides a pipe-tube sheet welding seam radiographic testing resolution ratio measuring method, easy to operate and realization are convenient for confirm the radiographic testing resolution ratio fast.
(3) The utility model provides a pipe-tube sheet welding seam ray detection resolution ratio measuring method not only can the measurement system resolution ratio, can also measure image resolution ratio, the unsharpness and the resolution ratio of a plurality of different positions.
Drawings
FIG. 1a is a front view of a resolution test piece according to an embodiment of the present invention; FIG. 1b is a schematic cross-sectional view of a resolution test strip along any one groove pair according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a detailed view of a groove pair on a resolution test piece according to an embodiment of the present invention;
FIG. 3 is a schematic view of a detection tool in an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating resolution measurement of a radiation detection system according to an embodiment of the present invention;
fig. 5 shows a schematic diagram of measuring resolution of images at different positions in radiographic inspection according to an embodiment of the present invention.
Description of the reference numerals
1-resolution test piece;
101-slot pair;
102-a central aperture;
103-center of the center hole of the test piece;
104-slot pair end circumference;
105-radial sector annular groove;
106-the central angle of the radial sector annular groove;
107-central angle between two radial sector annular grooves in the groove pair;
2-detecting the pipe end of the tool by rays;
3-detecting a tool imaging element by using rays;
4-detecting a tool interface end by rays;
5-ray source focus;
501-ray beam;
6-a gasket;
7-cushion block.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, and the features and advantages of the present invention will become more apparent and clear with the description.
In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or part indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The utility model provides a resolution ratio test block 1 for measuring pipe-tube sheet welding seam ray detection resolution ratio measurement.
The resolution test piece 1 is a thin sheet with parallel upper and lower surfaces, the outline of the thin sheet can be polygonal or circular, and the center of the thin sheet is provided with a center hole 102 perpendicular to the surface. The resolution test piece 1 has a plurality of groove pairs 101. Fig. 1a and 1b show a typical embodiment of the resolution test strip 1.
The upper and lower surfaces of the resolution test piece 1 should be parallel and flat, and preferably, the flatness and parallelism tolerance of the upper and lower surfaces of the resolution test piece 1 should not exceed ± 0.05 mm.
The outline of the resolution test piece 1 can be polygonal or circular, and can be arbitrarily set according to the requirement, but the function of the groove pair 101 cannot be influenced. It has been found that a profile boundary distance from the slot to the end circumference 104 of not less than 5mm is satisfactory.
The cylindrical surface of the central hole 102 of the resolution test piece 1 is perpendicular to the upper and lower surfaces of the resolution test piece 1, the shape of the central hole is the same as that of the tube end 2 of the radiation detection tool, the diameter of the central hole is matched with that of the tube end 2 of the radiation detection tool, preferably, the central hole is larger than that of the tube end 2 of the radiation detection tool, and the difference is not more than 1 mm.
The resolution test piece 1 has a plurality of groove pairs 101. The details of the groove pairs 101 are shown in fig. 2, each groove pair 101 being composed of two radial sector-shaped annular grooves 105 of identical geometric dimensions. The top view of the radial fan-shaped ring-shaped groove 105 is fan-shaped or has a fan-shaped horizontal cross section, the center of the circle is the center 103 of the central hole of the test piece, the top arc is on the circumference of the central hole 102, the bottom arc is on the circumference 104 of the end of the groove pair concentric with the central hole 102 of the test piece, and the two sides of the groove are along the radial direction of the central hole 102 of the resolution test piece 1. The two radial fan-shaped slots 105 in each slot pair 101 are spaced apart, with the two radial fan-shaped slots in the slot pair 101 being spaced apart at a central angle 107 equal to the central angle 106 of the two radial fan-shaped slots in the slot pair 101. The radial fan-shaped annular groove 105 is a through groove penetrating the upper and lower surfaces of the resolution test piece 1, the surface of the groove is perpendicular to the upper and lower surfaces of the resolution test piece 1, and the groove can be made by linear cutting or other suitable processing methods. In use, in order to prevent deformation of the space between the two radial sector annular grooves 105 in the groove pair 101 of the resolution test piece 1, the radial sector annular grooves 105 may be filled with a non-absorptive material having a far lower radiation absorption coefficient than steel, such as hard plastic or resin.
The top arcs of all radial sector annular grooves 105 on the resolution test piece 1 are all on the circumference of the test piece central hole 102, and the bottom arcs are all on the same groove pair end circumference 104 which is concentric with the resolution test piece 1 central hole 102. The different slot pairs 101 differ in that: the central angles 106 of the radial sector annular grooves in the groove pairs 101 are different. The central angle 106 of the radial fan-shaped annular groove is 0.1-10 degrees, and the angle tolerance is preferably not more than +/-10 percent of the value. Preferably, the central angle is 0.5-5 deg. When the central angle 106 of the radial fan-shaped annular groove on the resolution test piece 1 has a plurality of values, it is preferable that the central angle has a value of an equal ratio series of a common ratio. Further preferably, the common ratio is smaller than the ratio of the diameter of the groove pair end circumference 104 to the diameter of the central hole 102 of the resolution test strip 1. The radial sector-shaped grooves have a pair of grooves 101 with the same central angle 106, i.e. the pair of grooves 101 are considered to have the same dimensions. The groove pairs 101 with the same specification are distributed on the resolution test piece 1 in a centrosymmetric manner by taking the center 103 of the center hole of the test piece as a symmetric center. There are at least two groove pairs 101 of 1 specification on one resolution test piece 1. When there are two or more than two standard groove pairs 101 on the resolution test piece 1, the distance between the groove pairs 101 with different standards should be large enough to avoid the mutual interference of the images of the groove pairs 101 on the imaging element; the different gauge slot pairs 101 are arranged clockwise or counterclockwise according to the order of magnitude of the central angles 106 of their radial fan-shaped annular slots to facilitate image recognition of the slot pairs 101 on the imaging element.
The diameter of the groove pair end circumference 104 on the resolution test piece 1 and the maximum value of the central angle 106 of the radial sector annular groove jointly determine the lower limit value of the resolution measurement range of the resolution test piece 1. The diameter of the arc at the top of the radial sector annular groove 105 on the resolution test piece 1 and the minimum value of the central angle 106 of the radial sector annular groove jointly determine the upper limit value of the resolution measurement range of the resolution test piece 1. The maximum and minimum values of the groove to end circumference 104 diameter and the radial sector ring groove central angle 106 should be reasonably arranged to meet the use requirements. Through a lot of experimental studies, a typical embodiment that can be generally applied is that the diameter of the end circumference 104 of the groove pair is 2.5 times of the diameter of the central hole 102 of the test piece, 3 specification groove pairs 101 are provided on the resolution test piece 1, the total number is 6, and the central angles 106 of the radial sector annular grooves in the different specification groove pairs 101 are 1 degree, 2 degrees and 4 degrees respectively.
In the present invention, the thickness of the resolution test piece 1 is related to the ray absorption coefficient of the used material, and the larger the ray absorption coefficient of the material is, the smaller the thickness thereof can be. When the resolution test piece 1 is made of lead, tungsten or other material with a comparable radiation absorption coefficient, its thickness may be 0.1 mm. When the resolution test piece 1 is made of Inconel alloy, brass or other material with a comparable radiation absorption coefficient, the thickness thereof may be 1 mm. When the thickness of the resolution test piece 1 is small, or the hardness and rigidity of the used material are small, in order to prevent the resolution test piece 1 from deforming in use, the resolution test piece 1 can be packaged in a non-absorptive material such as hard plastic or resin, etc. the radiation absorption coefficient of which is much smaller than that of steel. Whatever the material used, the thickness of the resolution test piece 1 is not more than 2 mm.
The utility model discloses in the pipe-tube sheet welding seam ray detection resolution ratio measuring method who provides utilize resolution ratio test block 1 to measure the calculation, specifically include following step:
A typical tube-tube sheet weld radiographic inspection tool is shown in fig. 3. In general, the inspection tool is composed of three parts, including a radiographic inspection tool tube end 2, a radiographic inspection tool imaging element 3, and a radiographic inspection tool interface end 4. When performing radiographic inspection of a tube-tube sheet weld, the end 2 of the radiographic inspection tool is typically inserted into the tube of the tube-tube sheet weld. In transillumination, the radiation source focal point 5 emits a radiation beam 501 in the radiation detection tool tube end 2. The effective ray beam 501 is a part which can penetrate through a detection area and form an image on the ray detection tool imaging element 3. According to different ray detection technologies, the ray detection tool imaging elements 3 can be generally divided into three categories: radiographic film systems, digital imaging systems, and phosphorescent imaging systems. When the radiographic technology (RT technology) is used, the radiographic inspection tool imaging element 3 is typically a radiographic film system, including a filter, an intensifying screen, a radiographic film, a shielding plate, etc., and after transillumination, a radiographic film is formed by processing in a darkroom, and is observed and measured on a film viewer. When the Digital Radiography (DR) technique is used, the radiographic inspection tool imaging element 3 is usually a digital imaging device (digital detector), and can be directly observed and measured on a display after transillumination through computer processing. When using ray computer-aided imaging (CR) techniques, the radiographic inspection tool imaging element 3 is typically a phosphor imaging plate (IP plate) that can be directly observed and measured on a display after transillumination by a dedicated laser scanner and then computer processing. According to different types of used rays, the ray detection tool interface end 4 can be connected with a power supply or a source conduit. When the X-ray is used, the X-ray machine is arranged at the interface end 4 of the radiation detection tool, and the power supply is required to be switched on during transillumination, so that the X-ray can be generated at the focus 5 of the radiation source in the end 2 of the radiation detection tool. When gamma rays are used, the interface end 4 of the ray detection tool is connected with a source conduit to form a passage, and the gamma ray source is conveyed to the focus 5 of the ray source in the end 2 of the ray detection tool through the source conduit during transillumination.
The utility model provides a resolution ratio test block 1's centre bore 102's shape should be the same with ray detection frock pipe end 2, and the diameter of centre bore 102 should be with ray detection frock pipe end 2 phase-matches, and preferred slightly is greater than the diameter of ray detection frock pipe end 2, and the difference is no longer than 1 mm. And determining the diameter of the central hole 102 of the resolution test piece 1 according to the diameter of the pipe end 2 of the radiation detection tool with the resolution to be measured. The resolution test piece 1 can be smoothly sleeved on the pipe end 2 of the radiographic inspection tool, and the gap is smaller than 1 mm.
And 2, transilluminating the resolution test piece 1.
When the resolution of the tube-tube plate welding seam radiographic testing system needs to be measured, a resolution test piece 1 is directly sleeved on a tube end 2 of a radiographic testing tool, as shown in fig. 4. And adjusting the technological parameters of ray transillumination to obtain a clear ray image of the resolution test piece 1 on the ray detection tool imaging element 3.
When the resolutions of different positions of the tube-tube plate weld seam radiographic testing need to be measured, the distance between the resolution test piece 1 and the radiographic testing tool imaging element 3 is adjusted by adding the gasket 6 below the resolution test piece 1, as shown in fig. 5. In order to eliminate the resolution difference caused by the difference of the penetrating thickness of the ray, a pad 7 is added on the resolution test piece 1. The gasket 6 is a thin sheet with a central through hole and parallel and flat upper and lower surfaces, the material of the thin sheet can be carbon steel, low alloy steel or stainless steel, the outline of the thin sheet is not less than that of the resolution test piece 1, the central through hole is vertical to the upper and lower surfaces, and the shape and the diameter of the central through hole are preferably the same as those of the resolution test piece 1. For convenient use, the thickness of the gasket 6 can be 0.5mm or 1mm, so that the distance between the resolution test piece 1 and the radiographic inspection tool imaging element 3 can be adjusted in a layer-by-layer overlapping mode. The upper surface and the lower surface of the cushion block 7 are parallel and flat, the center of the cushion block is provided with a central through hole vertical to the surface, and the shape and the diameter of the through hole are preferably the same as those of the resolution test piece 1. The shape of the spacer 7 is ensured to cover the range of the effective ray beam 501 emitted from the focal point 5 of the ray source, which can penetrate the resolution test piece 1 and form an image on the imaging element 3. And adjusting the technological parameters of ray transillumination to obtain a clear ray image of the resolution test piece 1 on the ray detection tool imaging element 3.
And 3, analyzing the detection result and calculating the resolution.
And observing the radiographic image of the resolution test piece 1 obtained from the radiographic inspection tool imaging element 3. The observation has just clearly resolved the point of the smallest slot pair 101 of the two radial sector-annular slots 105 images, which is the maximum resolution point. This point corresponds to the arc length of the interval between the two radial sector annular grooves 105 in the groove pair 101 on the resolution test piece 1, which is the resolution value in mm. Resolution is 2 times the resolution value, which is the indistinguishable value in mm. The inverse of the uncertainty value, i.e. the resolution value, is given in lp/mm (line pair/mm).
The arc length corresponding to the interval between the two radial sector annular grooves 105 in the groove pair 101 of the resolution test piece 1 at the maximum resolution point is determined by a simple triangular relationship.
Because the pair of grooves 101 of the same specification are distributed on the resolution test piece 1 in a centrosymmetric manner by taking the center 103 of the center hole of the test piece as a symmetric center, the maximum resolution points should also be distributed in a centrosymmetric manner by taking the center 103 of the center hole of the test piece as a symmetric center. The two-point spacing L (in mm) was measured.
According to the manufacturing scheme of the resolution test piece 1 and the recognizable image of the groove pair 101 on the test piece, it is easy to know that the central angle 106 of the radial sector annular groove of the groove pair 101 where the maximum resolution point is located is θ (unit degree).
The distance F (in mm) of the source focal point 5 from the imaging unit in the imaging element 3 of the radiation detection tool is known from the radiation detection tool used. When the radiographic technique (RT technique) is used, the imaging unit is a radiographic film; when the radiographic digital imaging technique (DR technique) is used, the imaging unit is a digital imaging panel (digital detector); when using the ray computer-aided imaging technique (CR technique), the imaging unit is an IP plate.
According to the position of the resolution test piece 1, the distance H (unit mm) between the resolution test piece 1 and the imaging unit in the imaging element 3 of the radiation detection tool can be known. In general, the imaging element is inside the radiographic inspection tool imaging element 3, and H is greater than 0 even if the transillumination mode shown in fig. 4 is adopted.
By substituting the above values into the following formula, the resolution d (in mm) can be calculated.
Wherein pi is the circumference ratio.
The opacity value is 2 times d in mm.
The resolution value is the inverse of the uncertainty value in lp/mm, i.e., line pair/mm.
When using the transillumination arrangement shown in fig. 4, the measured resolution is the radiation detection system resolution, which is independent of the object to be examined.
When using the transillumination arrangement shown in fig. 5, the measured resolution is the image resolution at the different positions of the radiographic inspection.
Examples
The system resolution of gamma ray detection of a certain tube-tube plate welding seam and the image resolution at 2mm are measured.
The tube-tube plate welding seam of the steam generator of a pressurized water reactor nuclear power plant is detected by adopting an Ir192 ray source to carry out gamma ray film photographic technology.
(1) And selecting a resolution test piece 1 according to the diameter of the pipe end 2 of the radiation detection tool.
The diameter of the pipe end 2 of the ray detection tool in the embodiment is 15.5 mm. The selected resolution test piece 1 is made of Inconel alloy (material brand N06690), the outline of the resolution test piece 1 is a circular piece with the diameter of 50mm, the center hole 102 of the resolution test piece 1 is a circular piece with the diameter of 16mm, and the thickness of the resolution test piece 1 is 1 mm. There are 6 groove pairs 101 on the resolution test piece 1, the specification is 3, and the corresponding radial sector annular groove central angle 106 is 1 degree, 2 degrees and 4 degrees respectively. The slot pairs 101 are arranged in a counterclockwise direction from small to large at the central angle 106 of their radial sector annular slots. The groove pair end circumference 104 is 40mm in diameter. The central angle between the central lines of any two adjacent groove pairs 101 is 60 degrees. Any pair of grooves 101 of the same specification are distributed on the test piece in a center-to-center manner, and the central angle between the central lines is 180 degrees.
(2) Transillumination was performed on the resolution coupons.
By adopting transillumination arrangement as shown in fig. 4, a resolution test piece 1 is directly sleeved on a pipe end 2 of a ray detection tool to measure the resolution of a pipe-pipe plate welding line ray detection system. At this time, the distance H between the resolution test piece 1 and the imaging unit in the imaging element 3 of the radiographic inspection tool1Is 3 mm.
By adopting the transillumination arrangement shown in fig. 5, two gaskets 6 are placed below the resolution test piece 1, and a cushion block 7 is placed on the resolution test piece 1, so as to perform image resolution measurement at a position of 2mm in the pipe-pipe plate weld radiographic inspection. At this time, the distance H between the resolution test piece 1 and the imaging unit in the imaging element 3 of the radiographic inspection tool2Is 5 mm.
The gasket 6 is a circular thin sheet with the diameter of 60mm and the thickness of 1.0mm, the center of the gasket is provided with a through hole vertical to the upper surface and the lower surface, the diameter of the through hole is 16mm, and the material is austenitic stainless steel (material mark 304). The cushion block 7 is a circular ring with the diameter of 45mm and the thickness of 15mm, the center of the cushion block is provided with a through hole vertical to the upper surface and the lower surface, the diameter of the through hole is 16mm, and the cushion block is made of austenitic stainless steel (material mark 304).
The imaging unit in the ray detection tool imaging element 3 is a Carestream M100 film (according to GB/T19348.1, the film system class is C2 level).
The ray detection tool interface end 4 is connected with a source guide pipe to form a passage, and an Ir192 gamma ray source with the focal spot size of phi 0.5mm is conveyed to a ray source focal spot 5 in the ray detection tool pipe end 2 through the source guide pipe during transillumination. The distance F from the focal point 5 of the radiation source to the imaging unit in the imaging element 3 of the radiation detection tool is 30 mm. The source activity is 0.51 Ci.
The exposure time is adjusted to obtain a clear radiographic image of the resolution test piece 1 on the radiographic film. The exposure time was 60s when the transillumination arrangement shown in fig. 4 was used for resolution measurement of the tube-tube sheet weld radiographic inspection system. The exposure time was 150s when the transillumination arrangement shown in fig. 5 was used to perform an image resolution measurement at 2mm for tube-tube sheet weld radiographic inspection.
(3) And analyzing the detection result and calculating the resolution.
And (3) washing the exposed radiographic film from a darkroom, using an automatic film washing machine, using a Carestream machine to wash the sleeve medicine, wherein the developing time is 3 minutes, the developing temperature is 28 ℃, the fixing time is 5 minutes, and the fixing temperature is 28 ℃. The blackness of the washed negative is 2.2-3.7, and the evaluation requirement is met.
The resolution test film is observed to find the point of maximum resolution, i.e. the point of the smallest slot pair 101 that has just clearly resolved the images of the two radial sector annular slots 105. The distance L (in mm) between the two points is measured.
It is observed that on the system resolution test film, the maximum resolution point is located at the radial sector annular groove center angle 106 of the groove pair 101, which is 1 °, i.e., θ is 1 °. Measuring the distance L1Is 37.5 mm. Substituting into formula (1) to obtain resolution d10.294mm, 0.588mm for unsharpness, and 1.70lp/mm for system resolution.
By observationOn the 2mm image resolution test film, the maximum resolution point is located at a radial sector annular groove center angle 106 of 2 ° for the groove pair 101, i.e., θ is 2 °. Measuring the distance L231.0mm, calculated by substituting in the formula (1), to obtain the resolution d20.451mm, 0.902mm for unsharpness, and 1.11lp/mm for image resolution.
The invention has been described in detail with reference to specific embodiments and/or illustrative examples and the accompanying drawings, which, however, should not be construed as limiting the invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and embodiments thereof without departing from the spirit and scope of the present invention, and all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.
Claims (8)
1. A resolution test piece for measuring the tube-tube plate welding seam ray detection resolution is characterized in that a plurality of groove pairs (101) are arranged on the resolution test piece (1);
the resolution test piece (1) is provided with a central hole (102), the central hole (102) is perpendicular to the upper surface and the lower surface of the resolution test piece (1), the shape of the central hole is the same as that of a tube end (2) of a radiographic testing tool, the diameter of the central hole (102) is larger than that of the tube end (2) of the radiographic testing tool, and the difference is not more than 1 mm;
when the resolution test piece (1) is made of lead or tungsten, the thickness of the resolution test piece is 0.1mm, and when the resolution test piece (1) is made of Inconel alloy or brass, the thickness of the resolution test piece is 1 mm;
the thickness of the resolution test piece (1) is not more than 2 mm;
the resolution test piece (1) is provided with a plurality of groove pairs (101), and the groove pairs (101) are composed of two radial sector annular grooves (105) with the same geometric dimension;
the central angle (107) of the interval between the two radial fan-shaped annular grooves in the groove pair (101) is equal to the central angle (106) of the two radial fan-shaped annular grooves in the groove pair (101);
the horizontal section of the radial fan-shaped annular groove (105) is in a fan-shaped shape, the circle center of the radial fan-shaped annular groove is the circle center (103) of the central hole of the test piece, the top arc of the radial fan-shaped annular groove is arranged on the circumference of the central hole (102), the bottom arc of the radial fan-shaped annular groove is arranged on the circumference (104) of the tail end of the same groove pair concentric with the central hole (102) of the test piece, and the two side edges of the radial fan-shaped annular groove are in the radial direction of the central hole (102) of the resolution test piece (1).
2. The test strip according to claim 1,
the outline of the resolution test piece (1) is polygonal or circular,
in order to prevent the resolution test piece (1) from deforming in use, the resolution test piece (1) is packaged in a hard plastic or resin material.
3. The test strip according to claim 1,
the radial fan-shaped annular groove (105) is a through groove penetrating through the upper surface and the lower surface of the resolution test piece (1), and the surface of the radial fan-shaped annular groove is vertical to the upper surface and the lower surface of the resolution test piece (1).
4. The test strip according to claim 1,
the central angles (106) of the radial sector annular grooves of different groove pairs (101) on the resolution test piece (1) are different;
the central angle (106) of the radial fan-shaped annular groove is 0.1-10 degrees.
5. The test strip according to claim 1,
the central angle (106) of the radial fan-shaped annular groove is 0.5-5 degrees;
when the central angle (106) of the radial sector annular groove on the resolution test piece (1) has a plurality of values, the central angle (106) of the radial sector annular groove takes the value of an equal ratio array with a common ratio,
the ratio is smaller than the ratio of the diameter of the circumference (104) of the groove pair tail end to the diameter of the central hole (102) of the resolution test piece (1).
6. The test strip according to claim 1,
the groove pairs (101) with the same central angle (106) of the radial fan-shaped annular groove are groove pairs (101) with the same specification, and the groove pairs (101) with the same specification are distributed on the resolution test piece (1) in a centrosymmetric manner by taking the center (103) of the central hole of the test piece as a symmetric center.
7. The test strip according to claim 1,
two groove pairs (101) with at least 1 specification are arranged on one resolution test piece (1);
when the resolution test piece (1) is provided with two or more than two standard groove pairs (101), the different standard groove pairs (101) are arranged clockwise or anticlockwise according to the value sequence of the central angles (106) of the radial fan-shaped annular grooves.
8. The test strip according to any one of claims 1 to 7,
the diameter of the circumference (104) at the tail ends of the groove pairs is 2.5 times of that of the central hole (102) of the test piece;
the resolution test piece (1) is provided with groove pairs (101) with 3 specifications, and the central angles (106) of radial sector annular grooves in the groove pairs (101) with different specifications are 1 degree, 2 degrees and 4 degrees respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022809055.0U CN214408751U (en) | 2020-11-27 | 2020-11-27 | Resolution test piece for tube-tube plate welding seam ray detection resolution measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022809055.0U CN214408751U (en) | 2020-11-27 | 2020-11-27 | Resolution test piece for tube-tube plate welding seam ray detection resolution measurement |
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| CN214408751U true CN214408751U (en) | 2021-10-15 |
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