CN108562647A - The polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device and method that PA-TOFD is combined - Google Patents
The polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device and method that PA-TOFD is combined Download PDFInfo
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- CN108562647A CN108562647A CN201810012773.XA CN201810012773A CN108562647A CN 108562647 A CN108562647 A CN 108562647A CN 201810012773 A CN201810012773 A CN 201810012773A CN 108562647 A CN108562647 A CN 108562647A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/262—Arrangements for orientation or scanning by relative movement of the head and the sensor by electronic orientation or focusing, e.g. with phased arrays
Abstract
The present invention relates to polyethylene pipe hot melt banjo fixing butt jointing non-destructive testing technologies, it is desirable to provide a kind of the polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device and method of PA TOFD combinations.Including the circumferential scanning track being fitted around on polyethylene pipe；Circumferential scanning equipment is housed thereon；Connecting rod one end is fixed at the top of circumferential scanning equipment, and the other end installs phased array probe and straight probe of single crystal respectively by probe clamper；Two probes keep gap positioned at the both sides of polyethylene pipe hot melt banjo fixing butt jointing between the end popped one's head in and polyethylene pipe.There is ultrasound measuring instrument ultrasonic phase battle array control detection and TOFD to detect two kinds of detection functions, the sound wave transmitting probe that phased array probe is detected as ultrasonic phase array detection and TOFD simultaneously.Two kinds of testing result real-time synchronizations are shown.Overcome traditional pulse reflection type ultrasonic detection technique there are results that not intuitive, data can not be recorded and be stored, be difficult to make defect the shortcomings of being accurately positioned, is quantitative.
Description
Technical field
The present invention relates to polyethylene pipe hot melt banjo fixing butt jointing non-destructive testing technologies, and in particular to a kind of ultrasonic phase array
(PA) and ultrasonic diffraction time difference method (TOFD) combine polyethylene pipe hot melt banjo fixing butt jointing supersonic detection method.
Background technology
Compared to metallic conduit, polyethylene pipe has the advantages such as good toughness, corrosion-resistant, service life be long and economic and environment-friendly,
The successful application experience for having had many decades in fields such as ocean, oil gas, city gass, starts to be used in nuclear power station water delivery in recent years
Pipeline has very wide application prospect.
Sweat soldering is most common connection type between polyethylene pipe.Its strong applicability, cost are relatively low, are suitable for outer
The larger polyethylene pipe of diameter, at present 80% or more the polyethylene pipe connection of China's caliber DN90 or more all use sweat soldering side
Formula.But since sweat soldering technological parameter is more, constructing operation is complex, is influenced by human factor, in polyethylene pipe
There may be various defects for joint, and connector is made to become the weak link of polyethylene pipe system.To improve polyethylene pipe
Safety should also have perfect connector defects detection and Safety Assessment Methods in addition to by correctly selecting welding procedure and welding machine,
Prevent the pipeline containing excessive defect from putting into operation.
Polyethylene pipe needs to carry out visual examination, the water pressure test and non-destructive testing to all connectors before runtime.Appearance
Inspection includes checking surface indentation, verifies welding data, and whether monitoring water pressure test process leaks.The water pressure test requires to press
According to standard operation, suppress, voltage stabilizing, pressure release and packing stage, pipeline section any position cannot leak.However visual examination
It can only find apparent surface defect, and the professional skill of inspection result heavy dependence inspection personnel.The water pressure test can only identify
Through-wall crack in polyethylene pipe butt-fusion welded joint, None- identified such as crackle, hole, craftsmanship defect and fusion face are mingled with
The defects of, it is therefore desirable to identify these defects with security risk by non-destructive testing technology.
That supersonic detection method has many advantages, such as is convenient, intuitive, is not necessarily to safety protection facility, it has also become polyethylene pipe connector
Prefered method.Different from metal material, polyethylene is glutinous bullet high molecular material, when ultrasonic wave is propagated in polyethylene, can be sent out
Raw decaying, acoustic energy are constantly reduced with propagation distance, increase the detection difficulty of polyethylene pipe butt-fusion welded joint.
For polyethylene pipe butt-fusion welded joint detection technique, lot of domestic and international expert and research institution expand research.
The basic principle of America Plastic tubing association (PPI) based on pulse reflection method develops the super of polyethylene pipe butt-fusion welded joint
Sound detection system realizes the classification of butt joint quality, but None- identified goes out specific defect.The Welding Institute (TWI) uses
The ultrasonic longitudinal wave angle probe that nominal frequency is 2.25MHz, refraction angle is respectively 45 ° and 60 ° connects polyethylene pipe hot melt
Head detection reliability is tested, it is found that pulse echo method is very low to the detection sensitivity for being mingled with class defect, cold it is even more impossible to detect
Weld defect.The above method is impulse ejection method, can not solve this weaker difficult point of ultrasonic echo, therefore in detection heat-melting butt-joint
Have when connector clearly disadvantageous.
Ultrasonic phase battle array control detects and uses impulse echo technique, but different from traditional ultrasonic pulse-echo technology
It is to utilize more acoustic beam multi-angle scanning imaging technologies, realizes sound beam focusing and deflection, focus position is realized in wide range
The control and adjusting with focal spot size are set, ensures that there is more consistent detection resolving power within the scope of entire sound path, detection is made to scheme
As apparent, while improving detection speed.Polyethylene pipe detects using phased array earliest in American Gas research association (GRI)
It is higher to show that the phased-array technique polyethylene pipe hot melt banjo fixing butt jointing smaller to wall thickness has by experiment for butt-fusion welded joint
Detection sensitivity.The Guo Weican of Zhejiang Special Equipment Inspection and Research Institute proposes a kind of for polyethylene pipe hot melt docking
Connector ultrasonic phase array detection coupling focusing technology, improves detection sensitivity and detection depth.Structure-integrated company of the U.S.
(SI) Caleb et al. detects polyethylene pipe butt-fusion welded joint using ultrasonic phase array, realizes within the scope of depth 50mm
Defects detection, by experimental studies have found that ultrasonic phase array detection has preferably the volume shape defect in butt-fusion welded joint
Detection result.It for area shape defect, is influenced by defect direction, the reflection echo that phased array probe receives is weaker, causes to examine
Result failure or defect missing inspection are surveyed, quantitative analysis can not be carried out to defect.
TOFD (diffraction time difference method) detects defect by the diffraction energy obtained from the end angle of defect out of test specimen to be checked,
Different from conventional ultrasound detection, TOFD detections quantitative determine defect size without echo amplitude, but pulse is utilized to pass
Defect location is realized between sowing time and is quantified.The mid-90, RTD quality services Co., Ltd of the U.S. and Flour Corp companies
It cooperates research, TOFD technologies is detected for polyethylene pipe butt-fusion welded joint, and computer algebra method is combined to develop
The equipment for being directed to butt-fusion welded joint.Britain TWI obtains TOFD methods in polyethylene connector in a large amount of experimental basis
The discontinuous defect of plane has good detectivity, but for smaller smooth stomata and by the defects detection of near surface
Sensitivity is not so good as conventional Ultrasound.In order to promote end angle diffraction to occur, TOFD detections probe requirement used can emit big diffusion
The acoustic beam at angle, therefore it is required that sound wave transmitting probe has smaller size.But with the increase of detection depth, sound wave is in polyethylene
Middle decaying is serious, and reception backward energy is weaker, can not detect the larger polyethylene pipe butt-fusion welded joint of wall thickness.Increase probe
Acoustic energy beam can be improved in size, but can weaken the diffusivity of acoustic beam.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of poly- second that PA-TOFD is combined
The supersonic detection device and method of alkene pipe hot melting banjo fixing butt jointing.
To solve the above problems, the technical solution adopted by the present invention is：
A kind of polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device that PA-TOFD is combined, including ultrasound detection are provided
Instrument, the device further include a circumferential scanning track being fitted around on polyethylene pipe；It is equipped on circumferential scanning track
Circumferential scanning equipment, can under the control of circumferential scanning control device circumferentially scanning track carry out circumferentially around operation；One
It is parallel to the top that the connecting rod of polyethylene pipe is fixed on circumferential scanning equipment with its end, the other end of connecting rod is equipped with two
A probe clamper towards polyethylene pipe surface is respectively provided with the phased array probe that ultrasound measuring instrument is connected to by signal wire
And straight probe of single crystal；Two probes are positioned at the both sides of polyethylene pipe hot melt banjo fixing butt jointing, and the end popped one's head in and polyethylene pipe
Gap is kept between road.
In the present invention, slideway and rack are equipped on circumferential scanning track；The output shaft of one stepper motor passes through gear
It is engaged with the rack on circumferential scanning track, stepper motor is connected to circumferential scanning control device by signal wire.
In the present invention, the circumferential direction scanning control device includes control mainboard, liquid crystal display and button, and control mainboard is logical
It crosses signal wire and is respectively connected to control mainboard, liquid crystal display and button.
In the present invention, the probe clamper movable set can move along connecting rod in connecting rod and pass through lock
It is locked in connecting rod.
In the present invention, the connecting rod is equipped with the graduated scale for positioning probe clamper.
Invention further provides the polyethylene pipe hot melt banjo fixing butt jointings that PA-TOFD combinations are realized using aforementioned device
The method of ultrasound detection, includes the following steps：
(1) described device connection relation is pressed before detection and carry out equipment installation, and connect each wiring and plug, in pipeline
Couplant is coated at suspected location, then starts ultrasound measuring instrument；
(2) ultrasound measuring instrument selecting switch is set as ultrasonic phase array detection, is set on circumferential scanning control device
Speed that circumferential scanning equipment is circumferentially rotated and after the time, starts circumferential scanning equipment；Be scanned by phased array probe,
Defect location and real time imagery, ultrasound measuring instrument is according to the delay rule driving phased array probe for making sound beam focusing during being somebody's turn to do；
After the end of scan, circumferential scanning equipment is automatically stopped operation；
(3) ultrasound measuring instrument selecting switch is set as ultrasonic diffraction time difference method detection, on circumferential scanning control device
Speed that the circumferential scanning equipment of setting is circumferentially rotated and after the time, starts circumferential scanning equipment；Using phased array probe as
Sound wave transmitting probe, straight probe of single crystal are as receiving transducer, the delay rule that ultrasound measuring instrument is dissipated according to acoustic beam during being somebody's turn to do
It drives phased array probe to emit cylindrical wave, the signal that straight probe of single crystal receives is shown as TOFD scanning imageries, and and step
(2) the phased array detection imaging obtained by synchronizes display；After the end of scan, circumferential scanning equipment is automatically stopped operation.
In the present invention, common deficiency defined feature in polyethylene pipe hot melt banjo fixing butt jointing is prefixed on ultrasound measuring instrument
Numerical value；When detecting the defect for meeting defined feature numerical value during circumferential scanning, ultrasound measuring instrument automatic alarm is simultaneously
Defect orientation and test map are recorded, complete detection and assessment are carried out for the defect to polyethylene pipe hot melt banjo fixing butt jointing.
Inventive principle describes：
The present invention passes through the polyethylene pipe hot melt banjo fixing butt jointing TOFD detection methods of combination ultrasonic phase array, circumferential use
Mechanical scanning technology realizes the automatic detection of polyethylene pipe butt-fusion welded joint.Ultrasonic phase array detection makes acoustic beam using conventional
The delay rule of focusing utilizes phased array probe S Scanning Detction defects.In order to improve detection speed and be conducive to diffraction,
TOFD detections probe requirement used can emit the acoustic beam of big angle of flare.Conventional phased array probe is realized by being delayed rule
The chip of sound beam focusing, both ends first emits, and the chip at center finally emits, and makes the acoustic beam launched that there is small angle of flare to become reconciled
Directive property.The present invention is used as sound wave transmitting probe using phased array probe, to realize TOFD detection functions, delay rule with it is normal
On the contrary, the chip at center first emits, the chip at both ends finally emits rule, and the ultrasonic wave that plane wafer emits is made to dissipate outward
Cylindrical wave, to realize the diffusion of acoustic beam, and energy acoustic energy beam is stronger than straight probe of single crystal.
It is combined with TOFD detections by ultrasonic phase array detection, has merged the advantage of two methods respectively.Phased array is adopted
With focus method, focal position and focus direction are adjusted with electronic technology, to realize the dynamic focusing of acoustic beam, therefore
The control and adjusting that focal position and focal spot size are realized in wide range, it is more consistent within the scope of the entire sound path of guarantee
While detecting resolving power, while improving detection speed.And TOFD detection techniques use acoustic beam method of diffusion, are lacked to area-type
Falling into has higher detectability.Two methods realize respective real time imagery, can accurately detect the defects of workpiece, and determine it
Position, size and oneself height.
Compared with prior art, the solution have the advantages that：
(1) present invention utilizes ultrasound measuring instrument, phased array probe and straight probe of single crystal to polyethylene pipe butt-fusion welded joint
It is detected, the sound wave transmitting probe that phased array probe is detected as ultrasonic phase array detection and TOFD simultaneously.Ultrasound measuring instrument
Two kinds of detection functions are detected with ultrasonic phase battle array control detection and TOFD, two kinds of testing result real-time synchronizations are shown.Overcome tradition
There are results that not intuitive, data can not record and store, it is accurate fixed to be difficult to make defect for pulse reflection ultrasonic detecting technology
Position, it is quantitative the shortcomings of.
(2) Preliminary detection that polyethylene pipe hot melt banjo fixing butt jointing can be achieved is scanned by ultrasonic phase array, positions defect
Position, and TOFD detections can be overcome to smaller smooth stomata and by the relatively low disadvantage of the flaw detection sensitivity of near surface.
TOFD is detected using phased array probe as transmitting probe, and straight probe of single crystal is controlled as receiving transducer using ultrasound measuring instrument
Phased array probe emits cylindrical wave, the energy of transmitting sound wave can be improved, and then improve detection depth and imaging effect, can also overcome
The shortcomings that ultrasonic phase array area of detection shape defect scarce capacity.
(3) by polyethylene pipe circumferential direction scanning, the comprehensive detection of polyethylene pipe hot melt banjo fixing butt jointing can be realized,
Automatic alarm simultaneously records defect orientation and test map, and the defect of butt joint carries out complete detection and assessment.
Description of the drawings
Fig. 1 is the detection device schematic diagram that detection method of the present invention uses；
Fig. 2 is the flow chart of ultrasonic phase array (PA) detection pattern；
Fig. 3 is the flow chart of ultrasonic diffraction time difference method (TOFD) detection pattern；
Fig. 4 is ultrasonic phase array (PA) testing principle schematic diagram；
Fig. 5 is ultrasonic diffraction time difference method (TOFD) testing principle schematic diagram；
Fig. 6 is that phased array probe acoustic beam spreads schematic diagram when ultrasonic diffraction time difference method (TOFD) detects；
Fig. 7 is that sound beam focusing delay rule calculates schematic diagram；
Fig. 8 is that acoustic beam diverging delay rule calculates schematic diagram；
Reference numeral in Fig. 1：1 ultrasound measuring instrument, 2 phased array probe clampers, 3 phased array probes, 4 straight probe of single crystal
Clamper, 5 straight probe of single crystal, 6 circumferential scanning equipments, 7 connecting rods, 8 circumferential scanning control devices, 9 polyethylene pipes, 10 are circumferentially
Scanning track.
In Fig. 5, a leads directly to wave, b upper extreme points diffracted wave, c lower extreme points diffracted wave, e inner walls back wave, s center probes and connector
The distance at center, d1The depth of defect upper extreme point, d2The depth of defect lower extreme point, t1The time of straight-through wave and upper extreme point diffracted wave
Interval, t2The time interval of straight-through wave and lower diffracted wave.
In Fig. 7, d array elements spacing, the r depths of focus, i are array element number, n is array number, θ is deflection angle, liIt is No. i-th
For array element to the distance of setting focus, F is setting focus.
In Fig. 8, d array elements spacing, i are array element number, n is array number, R cylindrical wave radius of curvature.
Specific implementation mode
The polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device that PA-TOFD is combined, including there is phased array inspection simultaneously
The ultrasound measuring instrument 1 with TOFD detection functions is surveyed, and is fitted around the circumferential scanning track 10 on polyethylene pipe 9；
Equipped with circumferential scanning equipment 6 on circumferential scanning track 10, can under the control of circumferential scanning control device 8 circumferentially scanning track
10 carry out circumferentially around operation；One connecting rod 7 for being parallel to polyethylene pipe 9 is fixed on circumferential scanning equipment 6 with its end
Top, the other end of connecting rod 7 is set there are two the probe clamper towards polyethylene pipe surface, is phased array probe respectively
Clamper 2 and straight probe of single crystal clamper 4 are respectively equipped with the phased array probe 3 that ultrasound measuring instrument 1 is connected to by signal wire
With straight probe of single crystal 5.Phased array probe clamper 2 and 4 equal movable set of straight probe of single crystal clamper, can be along in connection 7
Connecting rod moves, and can be by being locked in connecting rod 7.Connecting rod 7 is equipped with the scale for positioning probe clamper
Ruler.Two probes are located at the both sides of the butt-fusion welded joint on polyethylene pipe 9, and end and the polyethylene pipe 9 popped one's head in it
Between keep gap.Slideway and rack are equipped on circumferential scanning track 10；The output shaft of one stepper motor passes through gear and week
Rack engagement on scanning track 10, stepper motor are connected to circumferential scanning control device 8 by signal wire.Circumferential scanning control
Device 8 includes control mainboard, liquid crystal display and button, and control mainboard is respectively connected to control mainboard, liquid crystal by signal wire
Display screen and button.
The method for realizing the polyethylene pipe hot melt banjo fixing butt jointing ultrasound detection that PA-TOFD is combined using aforementioned device, packet
Include following step：
(1) described device connection relation is pressed before detection and carry out equipment installation, and connect each wiring and plug, in pipeline
Couplant is coated at suspected location, then starts ultrasound measuring instrument；
(2) 1 selecting switch of ultrasound measuring instrument is set as ultrasonic phase array and detects (such as Fig. 2), controlled and fill in circumferential scanning
It sets and sets speed that circumferential scanning equipment 6 is circumferentially rotated on 8 and after the time, start circumferential scanning equipment 6；It is visited by phased array
First 3 be scanned, defect location and real time imagery, should during ultrasound measuring instrument 1 according to making the delay rule of sound beam focusing drive
Dynamic phased array probe 3；After the end of scan, circumferential scanning equipment 6 is automatically stopped operation；
When specific operation, phased array probe 3 and straight probe of single crystal 5 are placed in butt-fusion welded joint both sides, make two probes
Center it is consistent at a distance from connector center, record this distance and be configured in ultrasound measuring instrument 1.It is examined according to ultrasonic phase array
It surveys as a result, the phased arrays detection parameters such as the depth of focus, deflection angle and aperture number are adjusted, in realization joint area wide range
Scanning, obtains preferable phased array testing result.During scanning, phased array probe 3 emits and received as sound wave simultaneously to be visited
Head, ultrasound measuring instrument 1 encourage each array element of phased array probe 3 to realize that butt-fusion welded joint S is scanned according to delay rule, using having
Sound path range is imitated, weld inspection region is carried out to cover (as shown in Figure 4) as far as possible.Ultrasound measuring instrument 1 acquires phased array and visits
First 3 echo-signals received show phased array testing result in its display interface.
(3) 1 selecting switch of ultrasound measuring instrument is set as ultrasonic diffraction time difference method and detects (such as Fig. 3), in circumferential scanning control
Speed that circumferential scanning equipment 6 is circumferentially rotated is set on device 8 processed and after the time, starts circumferential scanning equipment 6；With phased
Battle array probe 3 is used as receiving transducer as sound wave transmitting probe, straight probe of single crystal 5, and ultrasound measuring instrument 1 is sent out according to acoustic beam during being somebody's turn to do
Scattered delay rule driving phased array probe 3 emits cylindrical wave, and the signal that straight probe of single crystal 5 receives is shown as TOFD scannings
Imaging, and synchronize display with the phased array detection imaging obtained by step (2)；After the end of scan, circumferential scanning equipment 6 is automatic
It is out of service.
During scanning, phased array probe 3 is used as sound wave transmitting probe, and straight probe of single crystal 5 is as receiving transducer (as schemed
5).Straight probe of single crystal 5 receives straight-through wave, defect upper extreme point and lower extreme point diffracted wave and inner wall back wave, ultrasound measuring instrument 1 are adopted
Collect the echo-signal that straight probe of single crystal 5 receives, TOFD testing results are shown on its display interface.It is detected from phased array different
It is to keep the delay rule that acoustic beam dissipates, principle opposite with existing ultrasonic phase array detection technique using one when TOFD is detected.
TOFD detections are first emitted using the chip of the center position of phased array probe 3, and the chip at both ends finally emits, and makes plane wafer
The ultrasonic wave of transmitting is the cylindrical wave of the different curvature radius dissipated outward, to realize the diffusion (as shown in Figure 6) of acoustic beam.Root
According to TOFD testing results, the adjustment parameters such as array number and cylindrical wave radius of curvature can get preferable TOFD testing results.
(4) number of common deficiency defined feature in 9 butt-fusion welded joint of polyethylene pipe is prefixed on ultrasound measuring instrument 1
Value；When detecting the defect for meeting defined feature numerical value during circumferential scanning, 1 automatic alarm of ultrasound measuring instrument simultaneously records
Defect orientation and test map, the defect for the butt-fusion welded joint to polyethylene pipe 9 carry out complete detection and assessment.It is logical
The position of defect in connector can be determined by crossing test map, and the type of defect in connector can be substantially determined according to the image.
If you need to emergency stop in detection process, 8 emergency stop switch of circumferential scanning control device is operated, circumferential movement scanning equipment 6 stops
Rotation stop is dynamic, and scanning stops.
Specific embodiment
Embodiment one：Conventional phased array scanning pattern implements example
S sweeping schemes, phased array probe is used to use internal loopback form, utilize effective sound when phased array detection of the present invention
Journey range covers detection zone as far as possible, and the delay rule Computing Principle of sound beam focusing is as shown in Figure 7.Wave mode is adopted
With longitudinal wave, and depth of focus r and scanning scope are determined according to the relative position of defect and probe.It can be by according to the above detection parameters
Formula 1 can calculate the delay time T of each array elementi。
In formula, c is spread speed of the ultrasonic wave longitudinal wave in polyethylene；liFor No. i-th array element to the distance of setting focus；
τ0It is time constant, in order to avoid τiThere is negative delay time.
Using the commercially available ultrasonic phase array detector with linear, fan-shaped two kinds of scanning modes, which can realize
32 channel receptions, independent 128 channel emissions, maximum can support the phased array probe of 128 array elements；A/S/B/C etc. is also supported simultaneously
Multiple display modes.By taking polyethylene pipe hot melt banjo fixing butt jointing detects common certain model probe as an example, centre frequency
2.5MHz, have 32 array elements, array element spacing 1.1mm, array element width 1.0mm, depth of focus 50mm, 30 ° of maximum deflection angle and
Array number is 8, and spread speed of the ultrasonic wave longitudinal wave in polyethylene is 2200m/s, and each array element is calculated according to the above parameter
Basic delay time, take τ0=923.6ns can then calculate revised array element delay time, as shown in table 1.
Phased array detects each array element delay time under certain parameter of table 1
Embodiment two：The detection mode example that phased array and TOFD are combined
When the present invention carries out TOFD detections, using phased array probe as sound wave transmitting probe, in order to make phased array probe
The diffusivity that the sound wave of transmitting has had uses the delay rule for making sound wave dissipate, acoustic beam diverging to the excitation of phased array probe
Delay rule Computing Principle it is as shown in Figure 8.When practical TOFD is detected, setting participates in the array number n and column of cylindrical wave transmitting
The radius of curvature R of surface wave can be calculated the delay time T of each array element according to the above detection parameters by formula 2i。
In formula, d is the array element spacing of probe；τ0It is time constant, in order to avoid τiThere is negative delay time.
Equally by taking above-mentioned model probe as an example：Centre frequency 2.5MHz, with 32 array elements, array element spacing 1.1mm, array element is wide
1.0mm is spent, spread speed of the ultrasonic wave longitudinal wave in polyethylene is 2200m/s.The array number for participating in cylindrical wave transmitting is 8, column
The basic delay time of each array element is calculated according to the above parameter, takes τ by the radius of curvature 10mm of surface wave0=342.9ns, then
Revised array element delay time can be calculated, as shown in table 2.
TOFD detects each array element delay time under certain parameter of table 2
Receiving transducer of the straight probe of single crystal as sound wave, receive lead directly to wave, defect upper extreme point and lower extreme point diffracted wave and
Inner wall back wave.Ultrasound measuring instrument handles straight probe of single crystal received signal, on the basis of straight-through wave, is surveyed on A sweep waveform
Go out the propagation time difference t of straight-through wave and defect end diffraction pulse1、t2, can be by formula in conjunction with center probe and connector center distance s
(3) flaw height H is calculated.
In formula, s is center probe at a distance from connector center；t1Time interval, the t of straight-through wave and upper extreme point diffracted wave2Directly
The time interval of logical wave and lower diffracted wave.
Claims (7)
1. the polyethylene pipe hot melt banjo fixing butt jointing supersonic detection device that a kind of PA-TOFD is combined, including ultrasound measuring instrument, special
Sign is that the device further includes a circumferential scanning track being fitted around on polyethylene pipe；On circumferential scanning track
It, can circumferentially scanning track be carried out circumferentially around operation under the control of circumferential scanning control device equipped with circumferential scanning equipment；
One connecting rod for being parallel to polyethylene pipe is fixed on the top of circumferential scanning equipment with its end, and the other end of connecting rod is set
There are two the probe clampers towards polyethylene pipe surface, are respectively provided with the phased array that ultrasound measuring instrument is connected to by signal wire
Probe and straight probe of single crystal；Two probes are positioned at the both sides of polyethylene pipe hot melt banjo fixing butt jointing, and the end popped one's head in and poly- second
Gap is kept between alkene pipeline.
2. the apparatus according to claim 1, which is characterized in that be equipped with slideway and rack on circumferential scanning track；One
The output shaft of stepper motor is engaged by gear with the rack on circumferential scanning track, and stepper motor is connected to circumferential direction by signal wire
Scanning control device.
3. the apparatus according to claim 1, which is characterized in that the circumferential direction scanning control device includes control mainboard, liquid
Crystal display screen and button, control mainboard are respectively connected to control mainboard, liquid crystal display and button by signal wire.
4. the apparatus according to claim 1, which is characterized in that the probe clamper movable set is in connecting rod, energy
It is moved along connecting rod and by being locked in connecting rod.
5. the apparatus according to claim 1, which is characterized in that the connecting rod is equipped with for positioning probe clamper
Graduated scale.
6. a kind of realizing that the polyethylene pipe hot melt banjo fixing butt jointing ultrasound that PA-TOFD is combined is examined using claim 1 described device
The method of survey, which is characterized in that include the following steps：
(1) described device connection relation is pressed before detection and carry out equipment installation, and connect each wiring and plug, it is to be checked in pipeline
Couplant is coated at position, then starts ultrasound measuring instrument；
(2) ultrasound measuring instrument selecting switch is set as ultrasonic phase array detection, is set on circumferential scanning control device circumferential
Speed that scanning equipment is circumferentially rotated and after the time, starts circumferential scanning equipment；It is scanned by phased array probe, defect
Positioning and real time imagery, ultrasound measuring instrument is according to the delay rule driving phased array probe for making sound beam focusing during being somebody's turn to do；Scanning
After, circumferential scanning equipment is automatically stopped operation；
(3) ultrasound measuring instrument selecting switch is set as ultrasonic diffraction time difference method detection, is set on circumferential scanning control device
Speed that circumferential scanning equipment is circumferentially rotated and after the time, starts circumferential scanning equipment；Using phased array probe as sound wave
Transmitting probe, straight probe of single crystal are as receiving transducer, and ultrasound measuring instrument drives according to the delay rule that acoustic beam dissipates during being somebody's turn to do
Phased array probe emits cylindrical wave, and the signal that straight probe of single crystal receives is shown as TOFD scanning imageries, and with step (2) institute
The phased array detection imaging obtained synchronizes display；After the end of scan, circumferential scanning equipment is automatically stopped operation.
7. according to the method described in claim 6, it is characterized in that, being prefixed polyethylene pipe hot melt pair on ultrasound measuring instrument
The numerical value of common deficiency defined feature in connector；When detecting the defect for meeting defined feature numerical value during circumferential scanning
When, ultrasound measuring instrument automatic alarm simultaneously records defect orientation and test map, for polyethylene pipe hot melt banjo fixing butt jointing
Defect carries out complete detection and assessment.
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| CN201810012773.XA CN108562647B (en) | 2018-01-06 | 2018-01-06 | PA-TOFD combined ultrasonic detection device and method for polyethylene pipeline hot-melt butt joint |
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|---|---|---|---|
| CN201810012773.XA CN108562647B (en) | 2018-01-06 | 2018-01-06 | PA-TOFD combined ultrasonic detection device and method for polyethylene pipeline hot-melt butt joint |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109682757A (en) * | 2019-02-25 | 2019-04-26 | 湖州市特种设备检测研究院 | A kind of vision inspection apparatus of line for polyethylene gas pipes sweat soldering connector |
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| CN109975410A (en) * | 2019-03-12 | 2019-07-05 | 浙江大学 | A kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode |
| CN109991312A (en) * | 2019-03-27 | 2019-07-09 | 中国石油天然气集团有限公司 | Steel frame polyethylene compound pipe electro-fusion welding welding point phased array imaging detection method |
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| CN112268954A (en) * | 2020-08-31 | 2021-01-26 | 北京工业大学 | L based on electromagnetic ultrasonic phased array sensorCRWave sound beam deflection regulating and controlling method |
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| CN114200019A (en) * | 2021-11-10 | 2022-03-18 | 深圳市燃气集团股份有限公司 | Polyethylene pipeline electric melting joint phased array test method and test system |
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| CN109856246A (en) * | 2019-01-28 | 2019-06-07 | 国电锅炉压力容器检验有限公司 | A kind of ultrasonic phase array pipe detection system and its mobile limiting device of popping one's head in |
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| CN109917019B (en) * | 2019-02-18 | 2021-07-30 | 中国石油天然气集团有限公司 | Steel skeleton polyethylene composite pipe phased array imaging detection device and method |
| CN109682757A (en) * | 2019-02-25 | 2019-04-26 | 湖州市特种设备检测研究院 | A kind of vision inspection apparatus of line for polyethylene gas pipes sweat soldering connector |
| CN109975410A (en) * | 2019-03-12 | 2019-07-05 | 浙江大学 | A kind of plastic pipeline hot melt banjo fixing butt jointing ultrasonic phase array detection scanning mode |
| CN109991312A (en) * | 2019-03-27 | 2019-07-09 | 中国石油天然气集团有限公司 | Steel frame polyethylene compound pipe electro-fusion welding welding point phased array imaging detection method |
| CN109991312B (en) * | 2019-03-27 | 2021-09-28 | 中国石油天然气集团有限公司 | Phased array imaging detection method for steel skeleton polyethylene composite pipe electrofusion welding joint |
| CN110886970A (en) * | 2019-11-26 | 2020-03-17 | 北部湾大学 | Safety protection early warning system and method for buried natural gas pipeline |
| CN114062489A (en) * | 2020-08-06 | 2022-02-18 | 宝山钢铁股份有限公司 | Grading type monitoring method for crack depth of roll neck of leveling roll |
| CN112268954A (en) * | 2020-08-31 | 2021-01-26 | 北京工业大学 | L based on electromagnetic ultrasonic phased array sensorCRWave sound beam deflection regulating and controlling method |
| CN114200019A (en) * | 2021-11-10 | 2022-03-18 | 深圳市燃气集团股份有限公司 | Polyethylene pipeline electric melting joint phased array test method and test system |
| RU220375U1 (en) * | 2023-07-17 | 2023-09-11 | Общество с ограниченной ответственностью "Технический центр контроля и диагностики - Атомкомплект" | DEVICE FOR CONTROL OF RING WELDED JOINTS OF PIPELINES |
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