CN109932375A - Tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method - Google Patents
Tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method Download PDFInfo
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- CN109932375A CN109932375A CN201910327351.6A CN201910327351A CN109932375A CN 109932375 A CN109932375 A CN 109932375A CN 201910327351 A CN201910327351 A CN 201910327351A CN 109932375 A CN109932375 A CN 109932375A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to capital construction technical field, in particular to a kind of tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method.The detection method includes: detection arrangement selection；X-ray machine X work instruction machine；Detection information is set；Calibration detectors response sensitivity；Installation detection imaging system；Setting detection transillumination geometric parameter；Arrangement detection label and image quality indicator；Characterization processes parameter is set；Calibration system image sensitivity；Weld data acquisition imaging and evaluation weldquality.Detection method provided by the invention improves DR detection transillumination ability, detection sensitivity and image quality, realizes the DR detection under the conditions of tube sheet heavy wall weld seam and long-focus, improves detection quality and work efficiency, reduce operation intensity and construction cost.
Description
Technical field
The present invention relates to capital construction technical field, in particular to a kind of tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration number
Word imaging detection method.
Background technique
Currently, conventional weld seam DR characterization processes require selection arrangement, ray according to workpiece feature and detection technique
Frequency conversion X-ray production apparatus is generally selected in source, and detection focal length is generally less than 700mm, and the operating voltage and detection light exposure of X-ray machine X is arranged
Equal technological parameters, starting DR system carry out weld seam detection and performance rating.The detection method is only applicable to detection focal length and is less than
The weld seam DR of 700mm and scanning thickness less than 25mm is detected, and picture quality can only achieve medium sensitivity industrial grade.In engineering
Often to tube sheet heavy wall weld seam detection in detection, for large diameter pipeline heavy wall weld seam, there is also transilluminations outside double-walled list shadow to detect
Situation, detection focal length are much larger than 700mm, and scanning thickness tapers off variation with the increasing of detection focal length, due to transmitted intensity with
Detection focal length and scanning thickness increase attenuation change it is big, DR detects transillumination ability and detection sensitivity and reduces, image quality
Examination criteria technical requirements are not achieved, therefore, there are limitations in engineer application for DR detection technique, can't realize to tube sheet
The DR of heavy wall weld seam long-focus is detected.
Summary of the invention
(1) technical problems to be solved
The present invention provides a kind of tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection methods, to overcome thickness
Wall weld seam and long-focus DR detect existing DR detection transillumination ability and detection sensitivity and reduce, and detection mark is not achieved in image quality
Quasi- technical requirements, DR detection technique, there are limitation, can't be realized to tube sheet heavy wall weld seam long-focus in engineer application
The disadvantages of DR is detected.
(2) technical solution
To solve the above problems, the present invention provides a kind of tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imagery detection
Method comprising following steps:
S1: detection arrangement selection, comprising: detection arrangement is selected according to the specification of workpiece to be detected, plate welding seams use
The detection of single wall list shadow transillumination, large diameter pipeline connect head choma weld seam using the outer transillumination detection of double-walled list shadow；Wherein, selection is detected
Imaging detector valid pixel size should be not more than 200 μm；It is the high frequency constant pressure X-ray of 300kv that radiographic source, which selects voltage rating,
Machine, Effective focus size are not preferably greater than 3mm；
Step S2: X-ray machine X work instruction machine, comprising: according to the weld seam material of detection workpiece and maximum scanning thickness, to the X of selection
X-ray machine X carries out work instruction machine；
Step S3: setting detection information, including starting DR digital detector and system detector；
Step S4: calibration detectors response sensitivity, comprising: under no workpiece conditions, by detecting tool by digital detector
It is staggered relatively with X-ray production apparatus and fixed, the distance between digital detector and X-ray production apparatus are arranged according to actually detected focal length；?
It closes in the state of X-ray production apparatus, calibration detectors pixel and background gray consistency；Then, the security protection of ray joint control is opened
Device and X-ray production apparatus, by be arranged X-ray production apparatus operating voltage and operating current, the rdaiation response sensitivity of calibration detectors,
The gray histogram curve of detector is adjusted between the 80%-95% of gray scale full scale, X-ray production apparatus is turned off；
According to pipeline specifications, frame speed, integral number of times, the lap of splice, exposure frequency, moving step sizes, the inspection of movement velocity parameter setting
Observing and controlling program file realizes the motion control to detection driving mechanism；
Step S5: installation detection imaging system, comprising: detection plate welding seams will test imaging system and be mounted in detecting tool, at
As detector and orientation X-ray production apparatus are staggered relatively in weld seam two sides, ray beam center vertical weld, detector center alignment weld seam
Detection start position；Detection pipeline connects head choma weld seam, and steel track is first fixedly mounted on to the pipe surface of weld seam side
On, then in orbit by the two driving mechanism installations of imaging detector and X-ray production apparatus, and two driving mechanisms are staggered relatively
And be fixedly connected, then by imaging detector and orientation X-ray production apparatus be separately mounted in respective driving mechanism, ray beam center with
The angle of vertical plane where pipeline girth weld center lineIt should control within 5 °, the detection that detector center is directed at weld seam rises
Point position.
Step S6: setting detection transillumination geometric parameter, comprising: imaging detector is arranged extremely by detecting tool regulating mechanism
The distance of weld seam is 20mm-30mm, then detection focal length is arranged by regulating mechanism；
Step S7: arrangement detection label and image quality indicator, comprising: detection label and picture should be arranged in detection workpiece surface before detection
Matter meter；
Step S8: setting characterization processes parameter, comprising: the work of X-ray production apparatus is tentatively set according to detection focal length and scanning thickness
Imaging frame speed and integral number of times technological parameter is arranged in voltage and operating current.
Step S9: calibration system image sensitivity, comprising: by adjusting setting X-ray production apparatus operating voltage and detection exposure
Technological parameter, calibration system image sensitivity and gray scale are measured, the gray histogram curve of welding line digital image-forming is adjusted to gray scale
Between the 50%-60% of full scale；
Step S10: weld data acquisition imaging, comprising: take weld seam detection imaging area, control two detection driving mechanisms along rail
Road synchronous operation carries out weld data acquisition and digital imagery according to the technological parameter of setting, according to fusion length and exposure time
Number acquires several digital pictures, and weld seam digital picture is stored using DICONDE format into computer；
Step S11: evaluation weldquality, comprising: under quiescent imaging state, measure the sensitivity of weld seam digital picture, differentiate
Rate, Normalized Signal/Noise Ratio and grayscale technology index carry out geometric dimension calibration using two-wire type image quality indicator, to weld seam digital picture
Enhancing and setting contrast evaluate weldquality according to examination criteria.
Preferably, detection label and image quality indicator should be arranged in detection workpiece surface before detection:
It is taken in label and arranges job number, pile No., welding seam No, weld seam specification, domain number, date recognition label, it will
Band and making ruler is marked to be fixed on workpiece surface with magnetic clutch, detection label should be apart from weld edge at least 5mm；
When single wall list shadow transillumination, line style image quality indicator is arranged in the ray source of workpiece；When Double-wall Single-image Radiographic Inspection, line style image quality indicator cloth
Set the detector side in workpiece；Image quality indicator should be arranged in weld seam one end be detected section length 1/4 position, wire should vertically across
Weld seam, filament are placed in outside；
Two-wire type image quality indicator is placed on the ray source of workpiece, is arranged on the base material for 1/4 position that plate welding seams are detected section length,
The center in the effective transillumination area of pipeline girth weld and endpoint location；The wire of two-wire type image quality indicator and the row or column of detector
At 2 °~5 ° angles, and filament is placed in outside.
(3) beneficial effect
It is saturating to improve DR detection for tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method provided by the invention
According to ability, detection sensitivity and image quality, realizes the DR detection under the conditions of tube sheet heavy wall weld seam and long-focus, improve detection matter
Amount and work efficiency reduce operation intensity and construction cost.
Detailed description of the invention
Fig. 1 is tube sheet of embodiment of the present invention thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method process
Figure；
Fig. 2 is pipe ring in tube sheet of embodiment of the present invention thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method
Weld seam detection tooling drawing.
Specific embodiment
It is as follows that the following describes the present invention in detail with reference to the accompanying drawings and embodiments.
As depicted in figs. 1 and 2, the present invention provides a kind of tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imagery
Detection method specifically includes:
Step S1: detection arrangement selection selects detection arrangement according to the specification of workpiece to be detected, and plate welding seams use
The detection of single wall list shadow transillumination, large diameter pipeline (φ 813mm- φ 1422mm) even examined using the outer transillumination of double-walled list shadow by head choma weld seam
It surveys.Should be not more than by detecting the imaging detector valid pixel size selected by 200 μm.It is 300kv's that radiographic source, which selects voltage rating,
High frequency constant pressure X-ray production apparatus, Effective focus size are not preferably greater than 3mm.Prepare detection font, label band, making ruler, magnetic clutch,
The materials such as image quality indicator, marking pen.The surface quality (including reinforcement height) of weld dimensions should be through visual examination qualification.
Step S2: X-ray machine X work instruction machine, comprising: according to the weld seam material of detection workpiece and maximum scanning thickness, to choosing
X-ray production apparatus carries out work instruction machine, the maximum operating voltage and working current value of X-ray production apparatus is arranged, operating voltage should not surpass
Cross the 90% of X-ray production apparatus voltage rating.The power switch for opening X-ray production apparatus is adjusted to operation range and carries out work instruction machine, X-ray production apparatus
Tube voltage and tube current gradually rise up to operating voltage and operating current, by the power switch tune of X-ray production apparatus after the completion of instruction machine
X-ray is closed to safe gear.
Step S3: setting detection information starts DR digital detector, after detection system is connected to the network successfully, setting detection
The information Steps such as filename, store path and detection program file.
S4: calibration detectors response sensitivity, comprising: under no workpiece conditions, by detecting tool by digital detector
It is staggered relatively with X-ray production apparatus and fixed, the distance between digital detector and X-ray production apparatus are arranged according to actually detected focal length；?
It closes in the state of X-ray production apparatus, calibration detectors pixel and background gray consistency；Then, the security protection of ray joint control is opened
Device and X-ray production apparatus, by be arranged X-ray production apparatus operating voltage and operating current, the rdaiation response sensitivity of calibration detectors,
The gray histogram curve of detector is adjusted between the 80%-95% of gray scale full scale, X-ray production apparatus is turned off.
It is set according to pipeline specifications, frame speed, integral number of times, the lap of splice, exposure frequency, moving step sizes, movement velocity parameter
Detection control program file is set, realizes the motion control to detection driving mechanism.
Step S5: installation detection imaging system, comprising: detection plate welding seams will test imaging system and be mounted on detecting tool
On, imaging detector 3 and orientation X-ray production apparatus 1 are staggered relatively at weld seam two sides, ray beam center vertical weld, 3 center of detector
It is directed at the detection start position of weld seam；Detection pipeline connects head choma weld seam, and steel track 2 is first fixedly mounted on weld seam side
On pipe surface, then 1 two driving mechanisms 4 of imaging detector and X-ray production apparatus are installed in orbit, and two driving machines
Structure is staggered relatively and is fixedly connected, then imaging detector 3 and orientation X-ray production apparatus 1 are separately mounted to respective driving mechanism 4
On, the angle of vertical plane where ray beam center and pipeline girth weld center lineIt should control within 5 °, detector center pair
The detection start position of quasi- weld seam.
Step S6: setting detection transillumination geometric parameter, comprising: imaging detector is arranged extremely by detecting tool regulating mechanism
The distance of weld seam is 20mm-30mm, then detection focal length is arranged by regulating mechanism.
Step S7: arrangement detection label and image quality indicator, comprising: detection label should be arranged in detection workpiece surface before detection
And image quality indicator.
It specifically includes: being taken in label and arrange job number, pile No., welding seam No, weld seam specification, domain number, day
Label band and making ruler are fixed on workpiece surface with magnetic clutch by phase identification label, and detection label should be apart from weld edge at least
5mm；
When single wall list shadow transillumination, line style image quality indicator is arranged in the ray source of workpiece；When Double-wall Single-image Radiographic Inspection, line style image quality indicator cloth
Set the detector side in workpiece；Image quality indicator should be arranged in weld seam one end be detected section length 1/4 position, wire should vertically across
Weld seam, filament are placed in outside；
Two-wire type image quality indicator is placed on the ray source of workpiece, is arranged on the base material for 1/4 position that plate welding seams are detected section length,
The center in the effective transillumination area of pipeline girth weld and endpoint location；The wire of two-wire type image quality indicator and the row or column of detector
At 2 °~5 ° angles, and filament is placed in outside.
Step S8: setting characterization processes parameter, comprising: X-ray production apparatus is tentatively arranged according to detection focal length and scanning thickness
Imaging frame speed and integral number of times technological parameter is arranged in operating voltage and operating current.
Step S9: calibration system image sensitivity, comprising: by adjusting setting X-ray production apparatus operating voltage and detection exposure
Technological parameter, calibration system image sensitivity and gray scale are measured, the gray histogram curve of welding line digital image-forming is adjusted to gray scale
Between the 50%-60% of full scale.
In this step, the gray histogram curve of welding line digital image-forming is adjusted to can between the 50%-60% of gray scale full scale
Utmostly ensure the clarity of image imaging.
Step S10: weld data acquisition imaging, comprising: take weld seam detection imaging area, control two detection driving mechanism edges
Track synchronous operation, weld data acquisition and digital imagery are carried out according to the technological parameter of setting, according to fusion length and exposure
Light number acquires several digital pictures, and weld seam digital picture is stored using DICONDE format into computer；
Step S11: evaluation weldquality, comprising: under quiescent imaging state, measure the sensitivity of weld seam digital picture, differentiate
Rate, Normalized Signal/Noise Ratio and grayscale technology index carry out geometric dimension calibration using two-wire type image quality indicator, to weld seam digital picture
Enhancing and setting contrast evaluate weldquality according to examination criteria.
Using existing in the weld data acquisition imaging and evaluation this two step of weldquality used in the embodiment of the present invention
There is technology mature in technology to be directly realized by.
Tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method provided by the invention:
(1) DR detection transillumination ability is greatly improved using DR system detection image sensitivity calibration process technology, realizes inspection
Scanning thickness reaches 65mm under the conditions of surveying focal length 1600mm, and detection scanning thickness improves more than 3 times under the conditions of identical focal length, solves
DR detects significant technology issues, realizes tube sheet heavy wall weld seam long-focus DR detection；
(2) using the small focus ray source technology of high frequency constant pressure and detector low coverage imaging technique reduce the deformation of DR imaging geometry and
Fogging image degree, picture quality reach the highly sensitive industrial grade of examination criteria；
(3) movement velocity, moving step sizes, the fortune of detection drive mechanism are improved using characterization processes program and control system
The dynamic technological parameters precision such as number and the lap of splice realizes the control detection of DR high-efficient automatic, improves detection work efficiency, big mouth
Diameter pipeline connects head mouth weld seam DR detection work efficiency and averagely improves 7 times or more, reduces detection operation intensity and construction cost；
(4) ray operation safety protection is carried out using radiation protection combined control equipment, improves detection operational security；
(5) it realizes to the outer transillumination inspection of the DR long-focus double-walled list shadow of large diameter pipeline (813~Ф of Ф 1422mm) heavy wall weld seam
It surveys, has expanded the engineer application range of DR detection technique.
Tube sheet thickness weld seam DR long-focus sensitivity calibration digital imaging detection method provided by the invention.According to welding type
And specification selects DR arrangement.Guarantee the gray-tone response accuracy of detector pixel by response sensitivity collimation technique.Peace
Fill detecting tool, driving mechanism, imaging control system.Setting detection transillumination geometric parameter, using detector low coverage imaging technique
Reduce the geometry deformation and indistinctness of image.Arrangement detection label and image quality indicator.Pass through setting characterization processes parameter and calibration
System imaging sensitivity guarantees detection transillumination ability and sensitivity, improves system imaging quality.Pass through characterization processes program and control
System processed automatically controls acquisition weld data and is imaged and stores in computer.Geometric dimension mark is carried out to weld seam digital picture
Fixed, details enhancing and setting contrast, evaluate weldquality according to examination criteria.
The above embodiments are only used to illustrate the present invention, and not limitation of the present invention, in relation to the common of technical field
Technical staff can also make a variety of changes and modification without departing from the spirit and scope of the present invention, therefore all
Equivalent technical solution also belongs to scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (2)
1. a kind of tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method comprising following steps:
Step S1: detection arrangement selection, comprising: detection arrangement, plate welding seams are selected according to the specification of workpiece to be detected
It is detected using single wall list shadow transillumination, large diameter pipeline connects head choma weld seam using the outer transillumination detection of double-walled list shadow；Wherein, detection choosing
Imaging detector valid pixel size should be not more than 200 μm；It is the high frequency constant pressure X of 300kv that radiographic source, which selects voltage rating,
X-ray machine X, Effective focus size are not preferably greater than 3mm；
Step S2: X-ray machine X work instruction machine, comprising: according to the weld seam material of detection workpiece and maximum scanning thickness, to the X of selection
X-ray machine X carries out work instruction machine；
Step S3: setting detection information, including starting DR digital detector and system detector；
Step S4: calibration detectors response sensitivity, comprising: under no workpiece conditions, by detecting tool by digital detector
It is staggered relatively with X-ray production apparatus and fixed, the distance between digital detector and X-ray production apparatus are arranged according to actually detected focal length；?
It closes in the state of X-ray production apparatus, calibration detectors pixel and background gray consistency；Then, the security protection of ray joint control is opened
Device and X-ray production apparatus, by be arranged X-ray production apparatus operating voltage and operating current, the rdaiation response sensitivity of calibration detectors,
The gray histogram curve of detector is adjusted between the 80%-95% of gray scale full scale, X-ray production apparatus is turned off；
According to pipeline specifications, frame speed, integral number of times, the lap of splice, exposure frequency, moving step sizes, the inspection of movement velocity parameter setting
Observing and controlling program file realizes the motion control to detection driving mechanism；
Step S5: installation detection imaging system, comprising: detection plate welding seams will test imaging system and be mounted in detecting tool, at
As detector and orientation X-ray production apparatus are staggered relatively in weld seam two sides, ray beam center vertical weld, detector center alignment weld seam
Detection start position；Detection pipeline connects head choma weld seam, and steel track is first fixedly mounted on to the pipe surface of weld seam side
On, then in orbit by the two driving mechanism installations of imaging detector and X-ray production apparatus, and two driving mechanisms are staggered relatively
And be fixedly connected, then by imaging detector and orientation X-ray production apparatus be separately mounted in respective driving mechanism, ray beam center with
The angle of vertical plane where pipeline girth weld center lineIt should control within 5 °, the detection that detector center is directed at weld seam rises
Point position.
Step S6: setting detection transillumination geometric parameter, comprising: imaging detector is arranged to weld seam by detecting tool regulating mechanism
Distance be 20mm-30mm, then by regulating mechanism setting detect focal length；
Step S7: arrangement detection label and image quality indicator, comprising: detection label and picture should be arranged in detection workpiece surface before detection
Matter meter；
Step S8: setting characterization processes parameter, comprising: the work of X-ray production apparatus is tentatively set according to detection focal length and scanning thickness
Imaging frame speed and integral number of times technological parameter is arranged in voltage and operating current.
Step S9: calibration system image sensitivity, comprising: by adjusting setting X-ray production apparatus operating voltage and detection light exposure work
Skill parameter, calibration system image sensitivity and gray scale, the gray histogram curve of welding line digital image-forming is adjusted to gray scale and is completely measured
Between the 50%-60% of journey；
Step S10: weld data acquisition imaging, comprising: take weld seam detection imaging area, control two detection driving mechanisms along rail
Road synchronous operation carries out weld data acquisition and digital imagery according to the technological parameter of setting, according to fusion length and exposure time
Number acquires several digital pictures, and weld seam digital picture is stored using DICONDE format into computer；
Step S11: evaluation weldquality, comprising: under quiescent imaging state, measure the sensitivity of weld seam digital picture, differentiate
Rate, Normalized Signal/Noise Ratio and grayscale technology index carry out geometric dimension calibration using two-wire type image quality indicator, to weld seam digital picture
Enhancing and setting contrast evaluate weldquality according to examination criteria.
2. tube sheet thickness weld seam DR long-focus transillumination sensitivity calibration digital imaging detection method as described in claim 1, special
Sign is, should arrange detection label and image quality indicator in detection workpiece surface before the detection: take in label and arrange engineering
Number, pile No., welding seam No, weld seam specification, domain number, date recognition label fix label band and making ruler with magnetic clutch
In workpiece surface, detection label should be apart from weld edge at least 5mm；
When single wall list shadow transillumination, line style image quality indicator is arranged in the ray source of workpiece；When Double-wall Single-image Radiographic Inspection, line style image quality indicator cloth
Set the detector side in workpiece；Image quality indicator should be arranged in weld seam one end be detected section length 1/4 position, wire should vertically across
Weld seam, filament are placed in outside；Two-wire type image quality indicator is placed on the ray source of workpiece, is arranged in plate welding seams are detected section length 1/
On the base material of 4 positions, the center in the effective transillumination area of pipeline girth weld and endpoint location；The wire of two-wire type image quality indicator with
The row or column of detector is at 2 °~5 ° angles, and filament is placed in outside.
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| CN111665274A (en) * | 2019-12-26 | 2020-09-15 | 宁波市宇华电器有限公司 | Workpiece table and polyethylene pipe nondestructive testing device |
| CN112557423A (en) * | 2020-09-15 | 2021-03-26 | 中国石油天然气集团有限公司 | Method for determining low exposure standard parameter in ray direct digital imaging detection |
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| CN112557423A (en) * | 2020-09-15 | 2021-03-26 | 中国石油天然气集团有限公司 | Method for determining low exposure standard parameter in ray direct digital imaging detection |
| CN112557423B (en) * | 2020-09-15 | 2022-05-17 | 中国石油天然气集团有限公司 | Method for determining low exposure standard parameter in ray direct digital imaging detection |
| CN112630237A (en) * | 2020-10-23 | 2021-04-09 | 上海船舶工程质量检测有限公司 | Digital imaging method for thick-wall pipeline welding seam radiographic inspection |
| CN113447501A (en) * | 2021-06-28 | 2021-09-28 | 国网黑龙江省电力有限公司电力科学研究院 | Radiographic inspection method for power plant metal pipeline under operating condition |
| CN114076775A (en) * | 2021-11-15 | 2022-02-22 | 国核示范电站有限责任公司 | Pipeline welding seam radiographic inspection geometric unsharpness control process |
| CN114076775B (en) * | 2021-11-15 | 2024-04-23 | 国核示范电站有限责任公司 | Pipeline weld joint ray detection geometric unclear control process |
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