CN210834713U - Heat exchange tube-tube sheet welded joint defect size correction test block - Google Patents
Heat exchange tube-tube sheet welded joint defect size correction test block Download PDFInfo
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- CN210834713U CN210834713U CN201920538899.0U CN201920538899U CN210834713U CN 210834713 U CN210834713 U CN 210834713U CN 201920538899 U CN201920538899 U CN 201920538899U CN 210834713 U CN210834713 U CN 210834713U
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Abstract
A heat exchange tube-tube plate welded joint defect size correction test block comprises a compensator, wherein a simulated defect is processed to be vertical to the outer peripheral surface of the compensator to form a heat exchange tube-tube plate welded joint defect size correction test block; the simulated defect has a diameter of 1mm or 2 mm. The location of the simulated defect is at fillet height 1/2 or 1/4. The utility model discloses processing a series of cross bore simulation defects of preparation on the compensator, through measuring the defect image size on the trans-illumination film, obtain the magnification of defect through the calculation, then use this magnification to revise the defect size on the actual detection film, reduce defect measuring error, improve the defect evaluation degree of accuracy.
Description
Technical Field
The invention relates to the technical field of radiographic inspection of a heat exchange tube-tube plate welded joint, in particular to a defect size correction test block for the heat exchange tube-tube plate welded joint.
Background
The welding lug of the heat exchange tube-tube plate welding joint is thin, and even small welding defects can greatly reduce the sealing property and the connection strength of the joint. The statistical results show that: the leakage rate after the device is put into use is 15-18% without adopting the device of the heat exchange tube-tube plate welding joint ray detection technology, and the leakage rate after the device adopting the technology is put into use is only 15-4% during the manufacturing. The detection of the internal defects of the welded joint of the heat exchange tube and the tube plate is more and more emphasized. The rod anode ray detection technology for the welding joint of the heat exchange tube and the tube plate has the advantages of high detection sensitivity, good reliability, good field adaptability, simple operation and the like, and has a relatively rapid development situation in domestic application in recent years.
The exposure parameters of the rod anode X-ray include tube voltage, exposure, focal length, projection angle, etc. Wherein the focal length and the pipe diameter jointly determine a projection angle, and the focal size, the focal length and the distance from a penetrated workpiece to a film can influence the magnification of the defect size. The compensator is an indispensable tool in the application of the heat exchange tube-tube plate welding joint radiographic inspection technology, and has the functions of reducing the trans-illumination thickness difference of the fillet weld radiographic inspection, reducing the scattering ratio, and preventing the corrosion of the blocking edge, so that the blackness of the inspection area on the bottom sheet is relatively uniform. The structure and shape of the compensator have great influence on the contrast sensitivity, and the design of the compensator is related to the diameter, the wall thickness, the type of fillet weld, the groove depth and the focal length of the heat exchange tube. The analysis is carried out according to the projection theory, the transillumination method can cause distortion and amplification of negative images, the amplification effect can influence the quantitative precision of defects, and the small defects are projected and amplified to cause unqualified negative evaluation and cause repair, thereby increasing the manufacturing cost of products and wasting manpower and working hours. Therefore, the distortion amplification factor of the defect should be considered as an important measure in the defect evaluation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a heat exchange tube-tube sheet welded joint defect size correction test block, through the utility model discloses confirm heat exchange tube-tube sheet welded joint defect image magnification for the ray detection film is assessed, reduces defect measuring error, improves the defect and assesses the degree of accuracy.
The utility model discloses the technical scheme who adopts:
a heat exchange tube-tube plate welded joint defect size correction test block comprises a compensator, wherein a simulated defect is processed to be vertical to the outer peripheral surface of the compensator to form a heat exchange tube-tube plate welded joint defect size correction test block; the simulated defect has a diameter of 1mm or 2 mm.
The location of the simulated defect is at fillet height 1/2 or 1/4.
The correction test block consists of one group or several groups.
The utility model discloses processing a series of cross bore simulation defects of preparation on the compensator, through measuring the defect image size on the trans-illumination film, obtain the magnification of defect through the calculation, then use this magnification to revise the defect size on the actual detection film, reduce defect measuring error, improve the defect evaluation degree of accuracy.
The utility model has known parameters such as the nature, shape, size and position of the simulated defect, and small error of the calculation magnification; and the compensator is simple and feasible in defect processing simulation, sampling processing on a welding joint is not needed, and a heat exchange tube-tube plate welding joint sample is not needed.
The utility model discloses can use the correction test block in the product transillumination, can compare the simulation defect image on every film with the defect influence, provide the reference basis for revising defect size and confirm the defect position.
Drawings
Fig. 1 is a schematic structural view of the present invention; in the figure d1，d2Are all simulated defect diameters;
FIG. 2 is a top view of FIG. 1; l in the figure is the simulated defect length
FIG. 3 is a schematic view of a transillumination arrangement of a heat exchange tube-tube sheet welded joint; h in the figure is the groove depth; k is the fillet weld fillet height; l is the extension length of the pipe head.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 and 2, the heat exchange tube-tube plate welding joint defect size correcting test block comprises a compensator, wherein a simulated defect 1 is processed perpendicular to the outer peripheral surface of the compensator to form a heat exchange tube-tube plate welding joint defect size correcting test block 2; the simulated defect 1 has a diameter of 1mm or 2 mm. The location of the simulated defect 1 is at fillet height 1/2 or 1/4. (excluding fillet weld fillet height k)
For the anode ray detection of a heat exchange tube-tube plate welding joint rod, the design of the compensator is crucial, and for a heat exchange tube-tube plate welding joint with a given structure, the compensator meeting the use requirement is manufactured according to the specification of the heat exchange tube, the fillet weld type, the extension length of a tube head and the focal length.
The selection of the position and the size of the simulated defect needs to consider factors such as the groove depth of the fillet weld, the acceptance standard of the defect and the like. The location of the simulated defect is typically selected at fillet height 1/2 or 1/4 (excluding fillet height k). The diameter of the simulated defect is determined according to the requirement of an acceptance standard, phi 1mm can be selected according to the standard for seal welding, and phi 2mm is generally determined according to the standard size of the acceptance standard of a protocol of a user for strength welding. Each simulation defect is uniformly distributed on the compensator and is vertical to the excircle of the compensator, and the depth is determined by the structure of the compensator.
The simulated defects can be processed into one or more groups of correction test blocks according to the positions and sizes of the defects to be found, the radiographic transillumination is respectively carried out, and the magnification factor is respectively obtained through calculation according to the test result.
The principle of the utility model is as follows: a group of simulated defects are processed at a specific position of the compensator, the value of the size of a known projection defect image and the actual simulated defect size is calculated to be used as an evaluation magnification factor of the defects of the welding joint of the heat exchange tube and the tube plate, the size of the defect image measured in the actual detection process is divided by the magnification factor to be used as a final defect evaluation size, and the defect size on the negative film is corrected by using a correcting test block to reduce unnecessary repair. The method comprises the following specific steps:
firstly, a compensator meeting the detection requirement is designed according to the specification of the heat exchange tube, the fillet weld type, the extension length of the tube head and the focal length. And then, selecting the position of the simulated defect according to the structure of the fillet weld, determining the diameter of the simulated defect according to an acceptance standard, and processing a correction test block according to the designed position and size of the simulated defect. And (4) transilluminating the correction test block, and calculating the ratio of the projection size of the simulated defect to the actual size of the simulated defect, so as to be used as the evaluation magnification factor of the defect of the heat exchange tube-tube plate welding joint. And when evaluating the bottom sheet of the welded joint of the heat exchange tube and the tube plate on the product, dividing the actually measured defect image size by the magnification factor, and finally evaluating according to the numerical value.
Claims (2)
1. The utility model provides a heat exchange tube-tube sheet welded joint defect size correction test block, includes the compensator, its characterized in that: a series of cross hole simulation defects (1) are processed perpendicular to the outer peripheral surface of the compensator to form a heat exchange tube-tube plate welding joint defect size correction test block (2); the simulated defect (1) has a diameter of 1mm or 2mm and is located at a fillet height of 1/2 or 1/4.
2. The heat exchange tube-tube sheet welded joint defect size correction test block as recited in claim 1, wherein: the correcting test block (2) consists of one group or several groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920538899.0U CN210834713U (en) | 2019-04-19 | 2019-04-19 | Heat exchange tube-tube sheet welded joint defect size correction test block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920538899.0U CN210834713U (en) | 2019-04-19 | 2019-04-19 | Heat exchange tube-tube sheet welded joint defect size correction test block |
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| CN210834713U true CN210834713U (en) | 2020-06-23 |
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| CN201920538899.0U Active CN210834713U (en) | 2019-04-19 | 2019-04-19 | Heat exchange tube-tube sheet welded joint defect size correction test block |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU206966U1 (en) * | 2021-06-10 | 2021-10-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" | A device for testing samples of "tube-tube sheet" connections of a shell-and-tube heat exchanger |
| CN114460108A (en) * | 2020-11-10 | 2022-05-10 | 哈电集团（秦皇岛）重型装备有限公司 | Hole-type sensitivity test piece for radiographic testing of tube-tube plate weld joint |
-
2019
- 2019-04-19 CN CN201920538899.0U patent/CN210834713U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460108A (en) * | 2020-11-10 | 2022-05-10 | 哈电集团（秦皇岛）重型装备有限公司 | Hole-type sensitivity test piece for radiographic testing of tube-tube plate weld joint |
| CN114460108B (en) * | 2020-11-10 | 2024-04-19 | 哈电集团（秦皇岛）重型装备有限公司 | Hole type sensitivity test piece for tube-tube plate welding line ray detection |
| RU206966U1 (en) * | 2021-06-10 | 2021-10-04 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" | A device for testing samples of "tube-tube sheet" connections of a shell-and-tube heat exchanger |
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| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Ying Inventor after: Zhang Xiangying Inventor after: Su Houde Inventor after: Du Rong Inventor after: Zhu Xiaogang Inventor after: Zhou Bo Inventor after: Wang Jing Inventor after: Yu Jianyong Inventor before: Zhang Ying Inventor before: Zhang Xiangying Inventor before: Su Houde Inventor before: Du Rong Inventor before: Zhu Xiaogang Inventor before: Zhou Bo Inventor before: Wang Jing Inventor before: Yu Jianyong |
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| CB03 | Change of inventor or designer information |