CN114527148A - Method for evaluating sensitivity of longitudinal defect ray detection of tube-tube plate welding seam and test piece - Google Patents
Method for evaluating sensitivity of longitudinal defect ray detection of tube-tube plate welding seam and test piece Download PDFInfo
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- CN114527148A CN114527148A CN202011323183.2A CN202011323183A CN114527148A CN 114527148 A CN114527148 A CN 114527148A CN 202011323183 A CN202011323183 A CN 202011323183A CN 114527148 A CN114527148 A CN 114527148A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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Abstract
The invention provides a method for evaluating the sensitivity of the ray detection of longitudinal defects of a tube-tube plate fillet weld. The sensitivity test piece involved in the method comprises circumferential grooves with different specifications, and can be used for evaluating the ray detection sensitivity of longitudinal volume type and area type defects such as strip defects, chain-shaped air holes, incomplete penetration, incomplete fusion, cracks and the like at different positions in the fillet weld of the tube-tube plate. The method has the advantages of low detection cost, high efficiency and good universality.
Description
Technical Field
The invention relates to the field of nondestructive inspection, in particular to a ray detection method and a related test piece, and particularly relates to a method for evaluating the sensitivity of the ray detection of longitudinal defects of a tube-tube plate welding seam and a test piece for evaluating the sensitivity in the method.
Background
The tube-tube plate welding structure exists in a great number of shell-and-tube heat exchange devices of a steam generator of a pressurized water reactor nuclear power station, a high-pressure heater of a thermal power station and the like. The welding quality of the tube-tube sheet weld affects the service life of the heat exchange device to a large extent. In order to verify the welding quality of the tube-tube plate welding seam, penetration detection and ray detection are mostly adopted at present. Due to the structural characteristics of the pipe-pipe plate welding line, special equipment and a special detection process are required during ray detection. 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 so as to ensure that the steam generator can work for a long time under high-temperature and high-pressure irradiation.
Based on the current production practice experience, an image quality meter is not placed during ray detection, and a sensitivity identification test is adopted to ensure that the sensitivity of the ray detection meets the detection requirement. In the sensitivity identification test, different sensitivity grades are generally characterized by machining small holes with different specifications on the surface of the weld joint of the tube-tube plate fillet weld welding sample. The method has high cost, low efficiency and poor universality, can only verify the detection sensitivity of the pore type volume defects on the surface of the workpiece, but cannot verify the sensitivity of other types of defects at other positions in the detection area, and cannot prove that the sensitivity in the detection volume range of the fillet weld of the whole tube-tube plate can meet the detection requirement.
Therefore, there is a need for a method for evaluating the sensitivity of the radiation detection of longitudinal defects in tube-tube sheet welds to evaluate the sensitivity of the radiation detection of longitudinal volume-type or area-type defects, such as strip defects, chain voids, lack of penetration, lack of fusion, cracks, etc., at any position in the region to be inspected in the tube-tube sheet welds.
Disclosure of Invention
In order to solve the above problems, the present inventors have conducted intensive studies to develop a method for evaluating the sensitivity of radiographic detection of longitudinal defects in a tube-tube sheet weld, with which the sensitivity of radiographic detection of longitudinal defects at arbitrary positions in the tube-tube sheet weld can be evaluated. The test piece used in the method is provided with a plurality of circumferential grooves with different positions and different specifications and is used for simulating longitudinal volume type defects and area type defects such as strip defects, chain-shaped air holes, incomplete penetration, incomplete fusion, cracks and the like at any position in a pipe-pipe plate welding line. The test piece is small and thin, is convenient to arrange, has adjustable position, flexible use and certain universality, thereby completing the invention.
The invention aims to provide a method for evaluating the sensitivity of the longitudinal defect ray detection of a tube-tube plate welding seam. The method utilizes a circumferential groove sensitivity test piece to simulate longitudinal weld defects for sensitivity evaluation, and specifically comprises the following steps:
step 2, transilluminating the simulation piece by using a proposed ray detection process;
and 3, analyzing the detection result and evaluating the sensitivity of the used ray detection process.
The second aspect of the present invention aims to provide a test piece for evaluating the sensitivity of the tube-tube sheet weld longitudinal defect radiographic inspection, wherein the test piece is a circumferential groove sensitivity test piece on which a circumferential groove is arranged.
The material of the test piece is the same as or similar to that of the metal at the position to be evaluated for sensitivity in the welding seam of the tube-tube plate.
According to the ray detection principle, the test piece has certain universality, and when the test piece is made of carbon steel, low alloy steel or 300-series austenitic stainless steel, the test piece can be used for various steel to-be-detected pieces, including various carbon steel, low alloy steel and stainless steel.
It is an object of a third aspect of the invention to provide a test strip for use in characterizing a tube-tube sheet fillet weld radiographic detection sensitivity level.
The beneficial effects of the invention include:
(1) the method for evaluating the sensitivity of the ray detection of the longitudinal defects of the welding line of the tube-tube plate is easy to operate and implement and is convenient for evaluating the sensitivity of the ray detection process.
(2) According to the circumferential groove sensitivity test piece provided by the invention, the longitudinal volume type and area type defects with different sizes at different positions in a welding seam can be simulated by adjusting the position of the test piece in the simulation piece, the position of the circumferential groove in the test piece and the width and depth of the circumferential groove, so that the purpose of evaluating the longitudinal defect ray detection sensitivity at any position of the welding seam can be realized.
(3) The test piece provided by the invention is convenient to adjust, strong in universality, low in processing cost and more flexible in operation.
(4) The circumferential groove provided by the invention has standard size, has certain universality and representativeness, and provides a reference for establishing a tube-tube plate welding seam longitudinal defect ray detection sensitivity grade standard.
Drawings
FIG. 1 is a schematic view of a circumferential groove sensitivity test piece 1 according to an embodiment of the present invention;
FIG. 2 shows a schematic view of the structure of a part to be inspected 2 in one embodiment of the present invention;
FIG. 3 is a schematic assembly diagram of a typical tube-tube sheet weld gamma ray inspection tool 3 according to an embodiment of the invention;
FIG. 4 shows a schematic view of the assembly of the dummy member 4 in accordance with an embodiment of the present invention, with dashed lines corresponding to the position of the tube 202 to be examined 2;
FIG. 5 shows a perspective view of the dummy member 4 in accordance with an embodiment of the present invention, with dashed lines corresponding to the position of the tube 202 to be tested 2;
fig. 6 is a schematic diagram showing the position of the test piece 1 for circumferential groove sensitivity in the dummy 4 with respect to the test piece 2 according to the embodiment of the present invention.
Description of the reference numerals
1-circumferential groove sensitivity test piece;
101-a circumferential groove;
2-a to-be-detected piece;
201-a tube plate;
202-a tube;
203-tube sheet weld;
3-a typical tube-tube plate welding seam gamma ray detection tool;
301-a source conduit;
302-a shutter;
303-dark bag;
304-a filter plate;
305-a compensation block;
306-a source of radiation;
4-a simulation piece;
401-a shim;
402-cushion blocks;
5-ray beam.
Detailed Description
The present invention will now be described in detail by way of specific embodiments, and features and advantages of the present invention will become more apparent and apparent from the following description.
In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "inner", "outer", etc. 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 the description, but do not indicate or imply that the device or part referred to 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 method for evaluating the sensitivity of the ray detection of the longitudinal defects of the welding line of the tube-tube plate can evaluate the sensitivity of the ray detection of the longitudinal defects of different positions, sizes and types in the welding line. The method is convenient and flexible to use, strong in universality and convenient to adjust, and can be used for evaluating the detection sensitivity of the longitudinal defect ray at any position in the welding line.
The method utilizes the circumferential groove on the test piece to simulate the longitudinal defects in the welding seam for carrying out ray detection sensitivity evaluation, and specifically comprises the following steps:
The part 2 to be inspected is a tube-sheet weld, a typical tube-sheet strength weld configuration is shown in fig. 2. Tube holes are drilled in the tube sheet 201 perpendicular to the surface, the diameter of the tube holes matching that of the tubes 202. The tubes 202 penetrate the tube holes in the tube sheet and extend a distance beyond the surface of the tube sheet, and the tubes 202 are welded to the tube sheet 201 to form fillet welds 203.
When evaluating the sensitivity level of the longitudinal defect ray of the tube-tube plate welding seam, several key positions needing to evaluate the ray detection sensitivity are generally determined according to the characteristics of the fillet welding seam 203 such as geometric dimension, assembly, welding process, material and the like, and the position parameters of the key positions are calculated. Wherein, the distance between the critical position to be evaluated for sensitivity and the central axis of the tube 202 is used for determining the position parameters of the circumferential groove 101 on the circumferential groove sensitivity test piece 1; the distance of the critical position to be evaluated for sensitivity from the upper surface of the tubesheet 201 is used to determine the total thickness of the spacer 401 superimposed on the circumferential groove sensitivity test piece 1.
The circumferential groove sensitivity test piece 1 is a thin sheet with parallel upper and lower surfaces, the outline of the circumferential groove sensitivity test piece can be polygonal or circular, the center of the circumferential groove sensitivity test piece is provided with a central through hole vertical to the surface, the upper surface of the circumferential groove sensitivity test piece is provided with circumferential grooves 101 with different specifications, the circumferential grooves 101 arranged on the same circumferential groove sensitivity test piece 1 have the same groove width and different groove depths.
The upper and lower surfaces of the circumferential groove sensitivity test piece 1 are parallel and flat, preferably, the tolerance of the parallelism and the flatness is not more than 5% of the thickness dimension. The thickness of the circumferential groove sensitivity test piece 1 is not less than the depth of the circumferential groove 101 required on the test piece, the thickness of the test piece is convenient for processing the circumferential groove 101, and the processing size tolerance of the circumferential groove 101 is convenient to guarantee. For convenient processing and use, the thickness of the circumferential groove sensitivity test piece 1 can be 0.5-5 mm, preferably 1-2 mm.
The outline of the circumferential groove sensitivity test piece 1 can be polygonal or circular, and can be customized as required, but the function of the circumferential groove 101 cannot be influenced. Through practical application, the use requirement can be met when the distance between the outline and the circumferential groove 101 is not less than 5 mm.
The shape and size of the central through hole of the circumferential groove sensitivity test piece 1 should match the shape of the cross section of the tube 202, and preferably the same as the inner diameter of the tube 202.
The upper surface of the circumferential groove sensitivity test piece 1 is provided with a plurality of circumferential grooves 101, and the circumferential grooves 101 are distributed on a circumference concentric with a central through hole of the circumferential groove sensitivity test piece 1. The specification parameters of the circumferential groove 101, i.e., the groove width and the groove depth, are standardized in the present invention. The position of the circumferential groove 101, i.e. the distance from the axis of the central through hole of the test piece, is determined according to the distance from the critical position of the sensitivity to be evaluated to the central axis of the tube 202. The circumferential groove 101 may be a rectangular groove or a U-shaped groove in its cross-sectional shape, but it is not necessarily a V-shaped groove. The length of the single circumferential groove 101 is not less than 5mm to meet the use requirement, and the circumferential groove 101 is preferably distributed over the whole circumference.
The circumferential groove 101 has a depth of 1 to 5, preferably 4.
The values of the specification parameters, the groove width and the groove depth of the circumferential groove 101 can be selected from continuous decimal series, such as … … 1.00.00, 0.90, 0.80, 0.70, 0.60, 0.50, 0.40, 0.30, 0.20, 0.10 … … or R10 series priority series, such as … … 1.00.00, 0.80, 0.63, 0.50, 0.40, 0.32, 0.25, 0.20, 0.16, 0.125, 0.10 … … and preferably R10 series priority series. In a further preferred embodiment, when the groove width is the nth value in the R10 series, the groove depth is preferably selected from one or more of the nth-2, nth-1, nth, n +1 and n +2 values.
In practice, it has been found that a typical embodiment that can be generally applied is to provide 8 circumferential grooves 101 on the test piece, wherein all the circumferential grooves 101 have the same groove width and the central angle of 45 °, and are distributed along the same circumference concentric with the central through hole of the test piece. The circumferential grooves 101 have four groove depths, and each groove depth has two circumferential grooves and is symmetrically distributed on the test piece. Four circumferential grooves 101 having different groove depths are arranged in the circumferential groove sensitivity test piece 1 in the order of the groove depths or in the reverse order, as shown in fig. 1.
In the present invention, the material of the circumferential groove sensitivity test piece 1 should be the same as or similar to that of the test piece 2. According to the ray detection principle, the ray absorption coefficient of the material of the circumferential groove sensitivity test piece 1 is not larger than that of the material of the to-be-detected piece 2, but the difference is not too large. Preferably, when the material of the circumferential groove sensitivity test piece 1 is carbon steel, low alloy steel or 300 series austenitic stainless steel, the applicable material of the to-be-detected piece 2 includes various carbon steels, low alloy steels and stainless steels.
The simulation piece 4 comprises a gasket 401 and a cushion block 402, the gasket 401 and the cushion block 402 are provided with a central through hole perpendicular to the surface, and the size of the central through hole is the same as that of the central through hole of the circumferential groove sensitivity test piece 1.
In order to adjust the position of the circumferential groove sensitivity test piece 1 in the axial direction of the tube 202, a spacer 401 and a spacer 402 should be prepared. The material of the spacer 401 and the spacer 402 should be the same as or similar to that of the object 2. The spacer 401 and spacer 402 have a central through hole perpendicular to the surface that is shaped and sized to match the diameter of the tube 202, preferably the same diameter as the inner diameter of the tube 202. The thickness of the gasket 401 is preferably 0.5mm to 5mm, and further preferably 0.5mm and 1mm, so that the position of the circumferential groove sensitivity test piece 1 can be conveniently adjusted by layer-by-layer superposition. The outer contour of the spacer 401 is only required to be within a range capable of covering the ray bundle 5, and is usually not less than the outer contour of the circumferential groove sensitivity test piece 1 to meet the use requirement. The thickness of the pad 402 is determined by the need, and is thick enough to cover the range of the beam 5. The upper and lower surfaces of the spacer 401 and the spacer 402 should be flat enough, and the flatness is usually not more than 0.05mm to meet the use requirement.
In use, the spacer 401, the circumferential groove sensitivity test piece 1 and the spacer 402 are stacked to assemble the dummy 4, as shown in fig. 4, in which the dotted line indicates the position corresponding to the pipe 202 in the test 2.
And 2, performing transillumination on the simulation piece by using a proposed ray detection process.
A typical tube-tube sheet weld gamma ray inspection tool 3 is shown in fig. 3. The typical tube-tube plate weld gamma ray detection tool 3 comprises a source conduit 301, a shielding plate 302, a dark bag 303, a filter plate 304, a compensation block 305 and a radiation source 306. The camera bag 303 is provided with an intensifying screen and a radiographic film, the camera bag 303 is clamped by a shielding plate 302 and a filter plate 304, and a compensating block 305 is mounted on the filter plate 304. The shielding plate 302, the dark bag 303, the filter plate 304 and the compensation block 305 are provided with detection holes with the same size, and the source conduit 301 is inserted into the detection holes during transillumination to ensure that the source 306 can reach a designated position to transilluminate the part to be inspected 2 or the simulation part 4.
In order to evaluate the sensitivity of the longitudinal defect radiographic inspection of the tube-tube plate weld, the same inspection tool 3 as that used for inspecting the workpiece 2 to be inspected is used, and a proposed radiographic inspection process is used to transilluminate the dummy 4, as shown in fig. 5. The position of the circumferential groove sensitivity test piece 1 in the simulation piece 4 is adjusted by increasing or decreasing the number of the spacers 401, so that the purpose of evaluating the longitudinal defect ray detection sensitivity of the tube-tube plate weld joint 203 at any position away from the surface of the tube plate 201 is achieved. The distance between the circumferential groove 101 and the axis of the central through hole of the circumferential groove sensitivity test piece 1 is adjusted by replacing different circumferential groove sensitivity test pieces 1, so that the purpose of evaluating the longitudinal defect ray detection sensitivity of the tube-tube plate welding seam 203 at any distance from the central axis of the tube 202 is realized. The groove width and the groove depth of the circumferential groove 101 are adjusted by replacing different circumferential groove sensitivity test pieces 1, so that the purpose of evaluating the radiation detection sensitivity of longitudinal defects with different sizes in the tube-tube plate welding seam 203 is achieved.
And (4) carrying out a series of transillumination on the simulation piece to obtain a plurality of radiographic films, and observing and evaluating in an evaluation room after the radiographic films are processed in a darkroom.
And 3, analyzing the detection result and evaluating the sensitivity of the used ray detection process.
And (3) observing a series of ray films obtained in the step (2). Because the circumferential grooves 101 of the same specification are symmetrically distributed on each circumferential groove sensitivity test piece 1, according to the ray detection principle, if the ray source 306 is centered, that is, the ray source 306 is located on the central through hole central axis of the simulation part 4, the blackness and the length of the image of the circumferential groove 101 of the same specification should be equal. On the contrary, whether the radiation source 306 is centered can be judged according to the blackness and the length of the image of the circumferential groove 101 with the same specification.
The data record table is filled according to the condition that the image of the circumferential groove 101 on the ray negative can be identified. The data sheet was analyzed to investigate the recognizable condition of the circumferential grooves 101 of different sizes at the same position in the dummy member 4.
According to the recognizable condition of the circumferential grooves 101 with different sizes at the same position in the simulation piece 4, the ray detection sensitivity of the longitudinal defect at the corresponding position in the to-be-detected piece 2 can be evaluated. On the contrary, when the longitudinal defects with the specified size at the 2 specified positions of the workpiece to be detected are required to be identified, the method can be used for evaluating whether the ray detection process parameters meet the requirements or not, and further adjusting the ray detection process parameters.
The invention provides a circumferential groove sensitivity test piece 1 for evaluating the detection sensitivity of longitudinal defect rays of a tube-tube plate welding seam. The circumferential groove sensitivity test piece 1 is as described in step 1.
The circumferential groove 101 on the circumferential groove sensitivity test piece 1 of the invention can simulate longitudinal defects such as strip defects, chain-shaped air holes, incomplete penetration, incomplete fusion, cracks and the like along the direction of a tube-tube plate welding line. The test piece provided by the invention is convenient to adjust, strong in universality, low in processing cost and more flexible in operation. The circumferential groove 101 provided by the invention has standard size, has certain universality and representativeness, and provides a reference for establishing a sensitivity grade standard of the longitudinal defect ray detection of the tube-tube plate welding seam.
Examples
And verifying the sensitivity level of the ray detection of the longitudinal defects of the tube-tube plate welding line of the high-pressure heater of a certain thermal power station.
The structure of the pipe-pipe plate weld of the part to be detected 2 is shown in fig. 2, wherein the pipe plate 201 is made of low alloy steel, and the pipe 202 is made of austenitic stainless steel; the pipe penetrates into the pipe hole and then extends out of the outer surface of the pipe plate by 2-3 mm, and the pipe is welded with the pipe plate after expansion joint to form a strength weld fillet 203. The internal diameter of the expanded pipe is about 16 mm. The depth of the welding seam is 3mm, and the width of the welding seam is 3 mm. And determining the key position for evaluating the detection sensitivity of the longitudinal defects of the welding seam as the groove position of the welding seam with the most unfavorable ray transillumination, namely, the position which is 3mm away from the upper surface of the tube plate along the axial direction of the tube and the position which is 11mm away from the axial direction of the tube along the radial direction of the tube. The sensitivity of the ray detection is required to be capable of identifying a circumferential groove with a groove width of 0.5mm and a groove depth of 0.5 mm.
Before the detection, the circumferential groove sensitivity test piece 1, the spacer 401, and the spacer 402 were assembled into the dummy 4. The circumferential groove sensitivity test piece 1, the spacer 401 and the spacer 402 are all made of austenitic stainless steel. The circumferential groove sensitivity test piece 1 is a circular thin sheet, the outer diameter is 40mm, the thickness is 2mm, and the diameter of a central hole is 16 mm. The width of the circumferential groove 101 is 0.5mm, and the depths of the four grooves are set as a group, which are 0.4mm, 0.5mm, 0.63mm and 0.8mm respectively. The two groups of circumferential grooves 101 are distributed on a circumference which takes the center of the circumferential groove sensitivity test piece 1 as the center of a circle and has a radius of 11 mm. The 8 circumferential grooves 101 are equally divided in length on the circumference, and the central angle of each circumferential groove 101 is 45 °. Two spacers 401 having a thickness of 1mm were stacked on the circumferential groove sensitivity test piece 1, and a spacer 402 having a thickness of 40mm was placed under the circumferential groove sensitivity test piece 1. The position of the test piece 1 for circumferential groove sensitivity in the dummy 4 relative to the test piece 2 is shown in FIG. 6.
The radiographic inspection tool 3 is provided with a 6mm shielding plate 302 and a 2mm stainless steel filter plate 304, and the dark bag 303 is clamped by the shielding plate 302 and the filter plate 304 to ensure the sealing performance of the dark bag 303. Two 0.03mm lead intensifying screens are arranged in the camera bag 303 to clamp the radiographic film. The ray film is C2 grade, and the model is Carestream M100.
The negative is evaluated under a film viewer. And measuring the blackness of the negative film by using a blackness meter, wherein the blackness range is 2.3-3.7, and the engineering requirements are met. 6 circumferential grooves 101 can be clearly identified on the bottom plate, the image blackness and the length of the circumferential grooves with the same size are basically equal, and the fact that the ray source is centered and the transillumination is effective is shown. The minimum circumferential groove 101 dimension can be identified as groove width x groove depth of 0.5mm x 0.5 mm.
In summary, the sensitivity level of the ray detection process in the detection range of the to-be-detected part can be evaluated as the circumferential groove 101 with the recognizable groove width multiplied by the groove depth multiplied by 0.5mm, and the engineering requirements are met.
The above description is only one exemplary embodiment of the present invention for a tube-tube sheet strength weld configuration, and it should be noted that: it will be apparent to those skilled in the art that the present invention may be applied directly or with minor modifications to a tube-tube sheet seal weld configuration, and such applications are also considered to be within the scope of the present invention.
The above description is only one exemplary embodiment of the radiographic inspection technique of the present invention using an Ir192 gamma ray source, and it should be noted that: it will be apparent to those skilled in the art that the present invention can be applied to other gamma ray source radiographic inspection techniques, gamma ray or X-ray digital imaging inspection techniques (DR), gamma ray or X-ray computer-aided imaging inspection techniques (CR), etc., with direct or slight modifications, and such applications should be considered as the scope of the present invention.
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 its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. The method for evaluating the sensitivity of the ray detection of the longitudinal defect of the fillet weld of the tube-tube plate is characterized in that a circumferential groove sensitivity test piece (1) is used for simulating the longitudinal defect of the weld to evaluate the sensitivity.
2. The method according to claim 1, characterized in that it comprises in particular the steps of:
step 1, selecting a circumferential groove sensitivity test piece (1) according to the structural characteristics of a to-be-detected piece (2) to form a simulation piece (4);
step 2, transilluminating the simulation piece (4) by using a proposed ray detection process;
and 3, analyzing the detection result and evaluating the sensitivity of the used ray detection process.
3. The method according to claim 1 or 2, characterized in that, in step 1, the center of the circumferential groove sensitivity test piece (1) is provided with a central through hole vertical to the surface, and the size of the central through hole is matched with the size of the pipe (202) in the piece to be detected (2), and is preferably equal to the inner diameter of the pipe (202);
the upper surface of the circumferential groove sensitivity test piece (1) is provided with a circumferential groove (101), wherein the circumferential grooves (101) arranged on the same circumferential groove sensitivity test piece (1) have the same groove width and different groove depths;
the depth of the circumferential groove (101) is 1-5, preferably 4.
4. Method according to claim 1 or 2, characterized in that in step 1 the circumferential groove (101) has a groove width and a groove depth selected from the series of consecutive decimal places, such as … … 1.00.00, 0.90, 0.80, 0.70, 0.60, 0.50, 0.40, 0.30, 0.20, 0.10 … … or the series of R10 priority, such as … … 1.00.00, 0.80, 0.63, 0.50, 0.40, 0.32, 0.25, 0.20, 0.16, 0.125, 0.10 … …, preferably the series of R10 priority.
5. The method according to claim 1 or 2, wherein, in step 1,
the simulation piece (4) comprises a gasket (401) and a cushion block (402), wherein the gasket (401) and the cushion block (402) are provided with a central through hole perpendicular to the surface, and the central through hole has the same size as the central through hole of the circumferential groove sensitivity test piece (1).
6. The method according to claim 1 or 2, characterized in that in step 1, a pad (402), a circumferential groove sensitivity test piece (1) and a plurality of gaskets (401) are placed in a superposed manner for transillumination.
7. The method according to claim 1 or 2, wherein in step 1, before the detection, the circumferential groove sensitivity test piece (1), the gasket (401), the cushion block (402) and a typical tube-tube plate weld gamma-ray detection tool (3) are assembled, wherein the typical tube-tube plate weld gamma-ray detection tool (3) comprises a source conduit (301), a baffle plate (302), a dark bag (303), a filter plate (304), a compensation block (305) and a radiation source (306).
8. A test piece for evaluating the sensitivity of the ray detection of the longitudinal defect of a tube-tube plate welding seam is a circumferential groove sensitivity test piece (1).
9. The test strip according to claim 8,
the material of the circumferential groove sensitivity test piece (1) is the same as or similar to that of a welding seam (203) on the to-be-detected piece (2);
according to the ray detection principle, as long as the ray absorption coefficient of the material of the circumferential groove sensitivity test piece (1) is not more than the ray absorption coefficient of the material of the to-be-detected piece (2);
preferably, when the material of the circumferential groove sensitivity test piece (1) is carbon steel, low alloy steel or 300 series austenitic stainless steel, the material of the to-be-detected piece (2) which can be applied comprises various carbon steels, low alloy steels or stainless steels and the like.
10. The circumferential groove sensitivity test piece (1) according to claim 3 or 4, wherein a circumferential groove (101) is provided on the circumferential groove sensitivity test piece (1);
the specification parameters of the circumferential groove (101), namely the groove width and the groove depth, are standardized and can be used for representing longitudinal defects such as strip defects, chain-shaped air holes, incomplete penetration, incomplete fusion, cracks and the like in the weld seam of the tube-tube plate, and the sensitivity of the ray detection of the longitudinal defects of the weld seam of the tube-tube plate can be evaluated according to the recognizable condition of a ray transillumination image of the circumferential groove (101) on a ray film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323183.2A CN114527148A (en) | 2020-11-23 | 2020-11-23 | Method for evaluating sensitivity of longitudinal defect ray detection of tube-tube plate welding seam and test piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011323183.2A CN114527148A (en) | 2020-11-23 | 2020-11-23 | Method for evaluating sensitivity of longitudinal defect ray detection of tube-tube plate welding seam and test piece |
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| CN202011323183.2A Pending CN114527148A (en) | 2020-11-23 | 2020-11-23 | Method for evaluating sensitivity of longitudinal defect ray detection of tube-tube plate welding seam and test piece |
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