CN108931577A - A kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system and method - Google Patents
A kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system and method Download PDFInfo
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- CN108931577A CN108931577A CN201810818581.8A CN201810818581A CN108931577A CN 108931577 A CN108931577 A CN 108931577A CN 201810818581 A CN201810818581 A CN 201810818581A CN 108931577 A CN108931577 A CN 108931577A
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- 238000001514 detection method Methods 0.000 claims abstract description 51
- 230000007547 defect Effects 0.000 claims description 47
- 238000012360 testing method Methods 0.000 claims description 29
- 238000011156 evaluation Methods 0.000 claims description 13
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- 238000009659 non-destructive testing Methods 0.000 abstract description 3
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- 238000012544 monitoring process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
Abstract
The present invention relates to field of non destructive testing, and in particular to a kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system and method.The present invention solves the problems, such as that existing detection technique cannot achieve the detection of oil-gas transportation steel plate 100% and detection speed is slow, low efficiency.Oil-gas transportation of the present invention steel plate electromagnetic acoustic automatic checkout system, including multiple EMAT energy converters and reference block；Multiple EMAT energy converters are divided into main body energy converter group and two groups of edge energy converter groups, and two groups of edge energy converter groups are located at the two sides of main body energy converter group；The EMAT energy converter of main body energy converter group and two groups of edge energy converter groups is two rows, two rows of EMAT energy converter Heterogeneous Permutations, and two rows of corresponding EMAT energy converters keep at least 10% coincidence；The most marginal EMAT energy converter in main body energy converter group two sides keeps at least 10% coincidence with the EMAT energy converter of corresponding edge energy converter group；Artificial reflector is machined in reference block, artificial reflector includes multiple flat-bottom holes, multiple rectangle flat-bottom slots and at least one skewed slot.
Description
Technical field
The present invention relates to field of non destructive testing, and in particular to a kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system
And method.
Background technique
With the continuous improvement of the discharge pressure, grade of steel of oil gas pipeline, the requirement of oil-gas transportation steel plate is not yet
It is disconnected to improve, for example, deep-sea pipeline, Large Diameter Pipeline Hi-grade steel thick-wall pipeline require the steel plate used need to carry out 100% ultrasound detection.
Steel plate is rolled by slab, and common deficiency has layering, folding, slag inclusion (miscellaneous), loose, segregation, white point and crackle in steel plate
Deng.Steel plate internal flaw has oil-gas transportation steel plate important influence, if the effective thickness at lamination defect position is reduced, meeting
Make physics, the mechanical performance decline at the position, and the discontinuity of rejected region metal structure also will make product in use
There is fatigue even to fail, seriously affects the service performance of product.The defects of layering of steel plate edge, slag inclusion (miscellaneous), is to subsequent
Welding quality is affected.
China's oil-gas transportation is detected based on piezoelectric supersonic with steel plate at present, realizes that 100% detection is more difficult, and need with water
Make couplant.
Compared with Conventional piezoelectric ultrasound detection, electromagnetic acoustic (Electromagnetic acoustic transducer letter
Title EMAT) detection is detected with non-contact non-coupled dose, realization high temperature detects, is easily realized automatic detection, is detected speed fastly, examines
Survey the advantages that high-efficient.By changing sonde configuration and frequency, the ultrasonic wave of a variety of wave moulds is inspired with can be convenient.Therefore,
Oil-gas transportation has broad based growth prospect in field of non destructive testing with steel plate electromagnetic acoustic automatic testing method.It is detected in conjunction with SH wave
Technology is expected to solution oil-gas transportation using electromagnetic acoustic technology and is asked with the detection of steel plate 100%, high speed, efficient, automatic detection
Topic.
Summary of the invention
It is an object of the invention to propose a kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system and method, solve
Existing detection technique cannot achieve the detection of oil-gas transportation steel plate 100% and the problem of detection speed be slow, low efficiency.
Technical proposal that the invention solves the above-mentioned problems is a kind of oil-gas transportation automatic detection system of steel plate electromagnetic acoustic
System, is characterized in that
Including multiple EMAT energy converters and reference block；
The multiple EMAT energy converter is divided into main body energy converter group and two groups of edge energy converter groups, two groups of edge energy converter groups
It is located at the two sides of main body energy converter group；The EMAT energy converter of main body energy converter group and two groups of edge energy converter groups is two
Row, two rows of EMAT energy converter Heterogeneous Permutations, and two rows of corresponding EMAT energy converters keep at least 10% coincidence；The main body
The most marginal EMAT energy converter in energy converter group two sides keeps at least 10% with the EMAT energy converter of corresponding edge energy converter group
It is overlapped；The reference block includes steel plate, positions on steel plate, quantitatively processes artificial reflector, the artificial reflector includes more
A flat-bottom hole, multiple rectangle flat-bottom slots and at least one skewed slot.
The skewed slot is wire cutting slot.
Further, above-mentioned EMAT energy converter chooses vertical magnetic field, double-spiral coil, the EMAT energy converter for generating SH wave.
Further, above-mentioned reference block outer dimension is identical as oil-gas transportation plate size to be measured.
Further, it for the ease of transport or the processing of artificial defect, carries out processing artificial reflector in two blocks of steel plates, then
Two pieces of steel plate welding are contrasted test block.
Further, above-mentioned multiple flat-bottom holes are separately positioned in the middle part of reference block and surrounding edge is apart from sheet edge
At 25mm；It is arranged in the flat-bottom hole in the middle part of plate be three groups, one group of aperture 3mm, buried depth be respectively 1.5mm,
8.25mm, 16.5mm, 24.75mm and 31.8mm, for testing detection system and electromagnet ultrasonic changer detectability；Aperture is
One group of 6mm, buried depth is respectively the flat-bottom hole of 1.5mm, 8.25mm, 16.5mm, 24.75mm and 31.8mm, for making
Make distance gain size curve, evaluates the equivalent size of different depth defect；Aperture is one group, buried depth 16.5mm of 50mm,
For simulating the lamination defect in plate；The multiple rectangle flat-bottom slot is arranged in the middle part of reference block, width × length: 40mm
× 80mm, buried depth are respectively 8.25mm, 16.5mm and 24.75mm, half are laterally and longitudinally respectively arranged, for simulating plate
In folding, white point the defects of；The skewed slot is arranged in the middle part of reference block and perforation plate width direction, width 6mm are buried
Deep is respectively 8.25mm, 16.5mm and 24.75mm, for testing electromagnet ultrasonic changer scanning coverage rate and system dynamic detection
Ability and reliability.
Further, the quantity for the flat-bottom hole that above-mentioned aperture is 50mm is 4.
In addition, the present invention also proposes a kind of detection side of above-mentioned oil-gas transportation steel plate electromagnetic acoustic automatic checkout system
Method, which comprises the following steps:
1) reference block is scanned, the detectability of test macro:
It is 1/4T, 2/4T and 3/4T using depth and distinguishes L apart from upper and lower surface depthOnAnd LUnderThe first flat-bottom hole,
The detectability of test macro；
It is 1/4T, 2/4T and 3/4T using depth and distinguishes L apart from upper and lower surface depthOnAnd LUnderThe second flat-bottom hole system
Make distance gain size curve, evaluates the equivalent size of different depth defect；
Using multiple third flat-bottom holes in the middle part of reference block thickness, lamination defect in steel plate is simulated；
Using the rectangle flat-bottom slot for 80mm × 40mm that depth is 1/4T, 2/4T and 3/4T, folding, white point in plate are simulated
Defect；
Using covering the skewed slot that entire strip width and depth are 1/4T, 2/4T and 3/4T in system scanning direction of advance,
Test macro scanning coverage rate and system dynamic detection ability and reliability；
2) multiple EMAT energy converters are scanned steel plate to be measured, obtain sweep waveform figure；Wherein, T is reference block
Thickness, the LOn=1.5mm, LUnder=1.2mm；
3) automatic evaluation:
3.1) the first gate is set, and starting point is located at beginning wave 1mm, and terminal is located at primary bottom wave 1mm, and height is spirit
60% wave height of sensitivity；Second gate is set, starting point is located at primary bottom wavefront 1mm, and terminal is located at after primary bottom wave at 1mm,
Its height is 60% wave height of sensitivity；
3.2) EMAT steel plate is carried out according to the test result in step 1) to detect, automatically record and automatic evaluation automatically.
Further, above-mentioned steps 1) in, the diameter of the first flat-bottom hole is 3mm；The diameter of second flat-bottom hole is 6mm；The
The diameter of three flat-bottom holes is 50mm；Rectangle flat-bottom slot is having a size of 80mm × 40mm.
Further, above-mentioned steps 3.2) automatic evaluation specifically: it is true by the horizontal scale and vertical scale of C-scan
Determine defective locations in steel plate, obtain Defect Equivalent value in conjunction with A sweep, automatic evaluation is carried out to defect.
Advantages of the present invention:
1, oil-gas transportation of the present invention steel plate electromagnetic acoustic detection system and method is generated using electromagnetic acoustic testing principle
Sound wave chooses and detects gate locating with arranged, reference block design and artificial defect by the selection of energy converter wave mould, can
With automatic detecting appraisal as a result, realize remote evaluation, realize oil-gas transportation with steel plate 100% detect, improve detection speed and
Detection efficiency.
2, oil-gas transportation of the present invention steel plate electromagnetic acoustic detection system and method is generated using electromagnetic acoustic testing principle
Sound wave chooses and detects gate locating with arranged, reference block design and artificial defect by the selection of energy converter wave mould, can
To show testing result and record automatically, realizes testing result persistence and trackability, reduce the influence of artificial factor.
Detailed description of the invention
Fig. 1 is the schematic diagram that electromagnetic acoustic generates；
Fig. 2 is SH shear wave for detecting lamination defect schematic diagram；
Fig. 3 is the arrangement of EMAT energy converter and layout drawing in the present invention；
Fig. 4 is the EMAT energy converter in rotatable magnetic field；
Fig. 5 is the view after the EMAT energy converter rotation in the rotatable magnetic field Fig. 4；
Fig. 6 is that reference block is used in automatic detection；
Fig. 7 is the A sweep display waveform of steel plate detection；
Fig. 8 is the flat-bottom hole test block of different depth and aperture；
Fig. 9 is to make distance gain size curve using different depth flat-bottom hole.
Wherein, 1- permanent magnet；2- alternating current coil；3- oil-gas transportation steel plate to be measured；4,6- detects defect gate；5,
7- monitors bottom wave gate；10-EMAT energy converter；11- reference block；T1For beginning wave；B1 is primary bottom wave；B2 is secondary bottom wave；d
For flat bore dia；T is reference block thickness.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
As oil-gas transportation steel pipe is in terrestrial pipeline and deep-sea pipeline (transfering natural gas from the west to the east one, two of such as China Petroleum and three lines
Pipeline engineering, Sino-Russian eastern line natural gas pipeline projects, the South Sea Li Gulf 3-1 project of middle extra large petroleum and Huangyan project etc.) it is extensive
Using the scanning rate as the tube body base material automatic ultrasonic of Submarine pipeline steel pipe detects requires 100% scanning, the pipe of terrestrial pipeline
Body base material automatic ultrasonic detects scanning rate and requires 50% scanning, and the automatic ultrasonic of existing piezoelectric chip is extremely restricted,
As the port number (piezoelectricity automatic ultrasonic can achieve 200 channels at present, and EMAT can achieve 800 channels) of detection device limits
System, piezoelectricity automatic ultrasonic needs couplant, and EMAT is non-coupled detection etc..
EMAT basic principle is to generate ultrasonic wave using galvanomagnetic-effect.The additional magnet specifically outside hot-wire coil, changes
The construction of type transformer coil and magnet generates the sound wave of different type and mode.EMAT energy converter 10 is by permanent magnet 1 and alternating current
Coil 2 is constituted, magnetic field, high-frequency electric field, conduction or magnetic conduction class detection material, detection material close to energy converter etc. be EMAT technology
Fundamental.Fig. 1 is the basic principle that electromagnetic acoustic generates, and EMAT energy converter 10 is placed on material to be detected, ultrasonic wave frequency
The alternating current Jo of rate is passed to EMAT coil, and electric current, as usually said vortex can be induced in conductive material by coil
Je.Due to kelvin effect, Eddy Distribution generates Lorentz force f1 in the surface of material, vortex under the action of externally-applied magnetic field Bo,
Cause the local vibration for being detected material and forms elastic wave；The principle for receiving sound wave is above-mentioned inverse process.In addition, working as quilt
When detecting material has magnetic conductivity, material lattice also suffers from the effect of magnetostrictive force fms and magnetizing force fm.Magnetic domain in material
Magnetization intensity vector can be influenced and be changed by external magnetic field, the boundary in magnetic history between magnetic domain moves, generate
Mechanically deform, as magnetostrictive effect.Magnetostrictive force, magnetizing force and Lorentz force intercouple, and then strengthen sound wave
Priming effect.Wherein, Bo is externally-applied magnetic field；Jo is alternating current；Je is vortex；F1 is Lorentz force；Fms is magnetostriction
Power；Fm is magnetizing force.
A kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system,
Including multiple EMAT energy converters 10 and reference block 11；
The multiple EMAT energy converter 10 is divided to for main body energy converter group and two groups of edge energy converter groups, two groups of edge energy converters
Group is located at the two sides of main body energy converter group；The EMAT energy converter 10 of main body energy converter group and two groups of edge energy converter groups is
Two rows, two rows of 10 Heterogeneous Permutations of EMAT energy converter, and two rows of corresponding EMAT energy converters 10 keep at least 10% coincidence；Institute
The most marginal EMAT energy converter in main body energy converter group two sides is stated to keep at least with the EMAT energy converter of corresponding edge energy converter group
10% coincidence；The reference block 11 includes steel plate, positions on steel plate, quantitatively processes artificial reflector, the artificial reflection
Body includes multiple flat-bottom holes, multiple rectangle flat-bottom slots and at least one skewed slot.
The selection of energy converter wave mould and arrangement are as follows:
EMAT is during detection, when meeting certain shooting condition, then can generate surface wave, SH wave and LAMB wave
Deng as change excitation signal frequency is allowed to meet following formula requirement:
F=nC/2Lsin θ (n is arbitrary integer),
C is the velocity of sound in formula, and f is signal frequency, and L is 1/2 wavelength.
Sound wave with tiltangleθ into workpiece skew back radiation (its amplitude also declines therewith), that is to say, that other conditions not
Under the preceding topic become, as long as changing signal frequency, so that it may change the radiation angle θ of sound wave, this is the another of EMAT energy converter 10
Feature.Due to the presence of this feature, so that it may in the case where constant more energy converter, realize the unrestricted choice of wave mould.
Using EMAT energy converter 10, the SH wave of vertical incidence is excited to detect Laminated steel defect, excitation surface of steel plate is at 45 °
SV wave detects vertical and horizontal crack defect.Vertical incidence SH wave, which detects lamination defect, will obtain longitudinal resolution more higher than longitudinal wave
Rate, and electromagnetic acoustic excites directly in steel plate and receives ultrasonic wave, and in a dynamic condition, acoustic beam angle and sensitivity are more
Stablize, and has expanded detection Acclimation temperature range significantly and improved detection speed.The EMAT energy converter 10 of vertical incidence SH wave is adopted
With the vertical magnetic field and double-spiral coil composition perpendicular to surface of steel plate；45 ° of SV wave detection probes, which use, is parallel to surface of steel plate
Bias field, two-phase inflection coil (or inflection coil) composition, according to the spatial frequency of coil adjust ultrasonic excitation frequency control
The angle of ultrasonic wave.
For defect existing for steel plate itself, the general defect for requiring only to detect layering etc. in steel plate and being parallel to surface,
It is that sound wave should be perpendicular to detected surface using normal beam technique detection.We choose vertical magnetic field, double-spiral coil design such as Fig. 2
Shown in EMAT energy converter 10, generate SH wave.
Steel plate electromagnetic acoustic detects the test format for passing through detection device using steel plate conveying automatically.Mainly by main body transducing
Device group and two groups of edge energy converter groups.Main body energy converter group covering detection steel plate intermediate region, energy converter group detecting and tracking is visited on side
It covers steel plate fringe region (as shown in Figure 3).Each transducer array is kept between energy converter using two rows of Heterogeneous Permutations
10% or so repetition covering, realizes and covers scanning to detection zone 100%.
Realize steel plate all standing scanning, the entire steel plate of scanning needs a fairly large number of energy converter, due to all multi-transducers
It is excessive with detected steel plate attraction, make energy converter be difficult to separate with steel plate.Therefore, rotatable 1 (magnetic of permanent magnet is devised
) special EMAT energy converter (as shown in Figure 4, Figure 5), spy has been disclosed in the patent document of Publication No. CN107607626A
Different EMAT energy converter, can be easily separated energy converter in the detection process with steel plate, solves all multi-transducers and oil gas to be measured is defeated
It send and is difficult to the problem of separating with steel plate 3.
The design of reference block 11 is as follows with artificial reflector selection mode:
Some artificial defects are set in reference block 11, and artificial defect is artificial reflector, and steel plate commonly manually reflects
Body has flat-bottom hole, rectangle flat-bottom slot and other forms wire cutting slot etc., is mainly used for simulating layering, folding, white point in plate
The defects of.These artificial defects are used to measure the upper and lower surfaces resolution ratio of electromagnet ultrasonic changer；Adjust detection ratio
And detection range；Measure distance gain size curve；Adjust detection sensitivity；Carry out the quantitative assessment of defect；Verify scanning coverage rate
With system dynamic detection ability and reliability etc..
11 outer dimension of reference block of design should be set according to using 1219 × 33mm of oil-gas transportation steel pipe maximum specification Φ
It is calculated as the steel plate of 6000mm × 3700mm × 33mm (length × width x thickness), the artificial defect in reference block 11 selects Φ 3mm/ Φ
The flat-bottom hole of 6mm/ Φ 50mm different depth, the rectangle flat-bottom slot of 40mm × 80mm different depth and width are 6mm different depth
Cover the skewed slot of strip width.Fig. 6 is oil-gas transportation steel plate reference block 11 and the artificial defect figure of design, specific as follows:
A, aperture 3mm is designed in the middle part of reference block 11, buried depth is respectively 1.5mm (table on electromagnet ultrasonic changer
Face resolution ratio), 1 group of 8.25mm, 16.5mm, 24.75mm and 31.8mm (electromagnet ultrasonic changer lower surface resolution ratio) it is flat
Hole, for testing detection system and electromagnet ultrasonic changer detectability；
B, 11 surrounding edge of reference block apart from sheet edge 25mm (depend primarily on electromagnet ultrasonic changer width,
Using electromagnet ultrasonic changer width to design aperture 6mm in the middle part of 50mm) and plate, buried depth is respectively that (electromagnetism is super by 1.5mm
Sonic transducer upper surface resolution ratio), 8.25mm, 16.5mm, 24.75mm and 31.8mm (electromagnet ultrasonic changer lower surface differentiate
Rate) 5 groups of flat-bottom holes evaluate the equivalent size of different depth defect for making distance gain size curve；
C, aperture 50mm is designed in the middle part of reference block 11, buried depth is 4 flat-bottom holes of 16.5mm, is used for analog board
Lamination defect in material；
D, in the middle part of reference block 11 design width × length: 40mm × 80mm, buried depth be respectively 8.25mm,
2 groups of rectangle flat-bottom slots of 16.5mm and 24.75mm, the defects of for simulating the folding in plate, white point；
E, the width 6mm of perforation plate width direction is designed in reference block 11, buried depth is respectively 8.25mm, 16.5mm
And 24.75mm, the skewed slot of the oblique perforation strip width of length are dynamic for testing electromagnet ultrasonic changer scanning coverage rate and system
State detectability and reliability.
F, in the reference block 11 of design, a dotted line positioned at 11 mid-length position of reference block can will be to having a competition
Block 11 is cut into 2 pieces along dotted line, primarily to being readily transported or the processing of artificial defect, again by reference block 11 after completing
Weld together.
In Fig. 6:
1, A1~A5 is Ф 6mm flat-bottom hole, and A6 is Ф 3mm flat-bottom hole, buried depth 1.2mm；B1~B5 is that Ф 6mm is flat
Hole, B6 are Ф 3mm flat-bottom hole, buried depth 1/4T；C1~C5 is Ф 6mm flat-bottom hole, and C6 is Ф 3mm flat-bottom hole, buried depth 1/2T；
D1~D5 is Ф 6mm flat-bottom hole, and D6 is Ф 3mm flat-bottom hole, buried depth 3/4T；E1~E5 is Ф 6mm flat-bottom hole, and E6 is Ф 3mm
Flat-bottom hole, buried depth 1.5mm.
2, F is 80mm × 40mm × 1/4T rectangle flat-bottom slot；G is 80mm × 40mm × 1/2T rectangle flat-bottom slot；H is 80mm
× 40mm × 3/4T rectangle flat-bottom slot.
3, I is Φ 50mm flat-bottom hole, buried depth 1/2T.
4, JKL, MNO are skewed slot, and JKL width is 6mm, and JK depth is 1/4T, and JK length is 2/3JKL, and KL depth is 2/
4T, KL length are 1/3JKL；MNO width is 6mm, and MN depth is 2/4T, and MN length is 1/3MNO, and NO depth is 3/4T, NO long
Degree is 2/3MNO.
5, other artificial defects can also be processed in reference block 11.
6, reference block can be divided into two part production processing and weld together again, in order to process or transport.
A kind of detection method of above-mentioned oil-gas transportation steel plate electromagnetic acoustic automatic checkout system, which is characterized in that including
Following steps:
1) reference block is scanned, the detectability (as shown in Figure 8 and Figure 9) of test macro:
It is 1/4T, 2/4T and 3/4T using depth and distinguishes L apart from upper and lower surface depthOnAnd LUnderThe first flat-bottom hole,
The detectability of test macro；
It is 1/4T, 2/4T and 3/4T using depth and distinguishes L apart from upper and lower surface depthOnAnd LUnderThe second flat-bottom hole system
Make distance gain size curve, evaluates the equivalent size of different depth defect；
Using the 11 multiple third flat-bottom holes in middle part of reference block, lamination defect in steel plate is simulated；
Using the rectangle flat-bottom slot for 80mm × 40mm that depth is 1/4T, 2/4T and 3/4T, folding, white point in plate are simulated
Defect；
Using covering the skewed slot that entire strip width and depth are 1/4T, 2/4T and 3/4T in system scanning direction of advance,
Test macro scanning coverage rate and system dynamic detection ability and reliability；Wherein, T is the thickness of reference block, the LOn=
1.5mm,LUnder=1.2mm；
2) multiple EMAT energy converters 10 are scanned steel plate to be measured, obtain sweep waveform figure；
3) automatic evaluation:
3.1) setting of double-gate, when carrying out steel plate EMAT detection, waveform is as shown in fig. 7, show defective waveform and bottom
Wave, using detection defect gate 4, detection defect gate 6, monitoring bottom wave gate 5, monitoring bottom wave gate 7 to defect waves and bottom wave
It is monitored, automatic recording function may be implemented.Usually by the gate widths setting of gate defect waves in beginning wave and primary
Between the wave of bottom, gate starting point is after beginning wave about 1mm, and gate terminal is before primary bottom wave about 1mm.Gate height is set as spirit
At 60% wave height of sensitivity；Secondary gate bottom wave width starting point is arranged at primary bottom wavefront about 1mm, gate terminal is arranged one
After secondary bottom wave at about 1mm, it is thus provided with double-gate.
3.2) EMAT steel plate is carried out according to the test result in step 1) to detect, automatically record and automatic evaluation automatically.
It is generated by the above EMAT, the selection of wave mould, array transducers arrangement, the design of reference block 11, detection gate locating
It with automatic evaluation system research, makes automatic detection as shown in Figure 6 and is verified with dynamic contrast test block 11, scanning goes out to having a competition
Block 11 automatically records scanning figure, and it is fine right that the automatic detection of this figure and design has been obtained with artificial defect in dynamic contrast test block 11
It should be related to, reach desired effect.C-scan can determine defective locations in steel plate by horizontal scale and vertical scale very well, show
Defect shape and distribution are shown, obtain Defect Equivalent value in conjunction with A sweep, to carry out automatic evaluation to defect.
Claims (9)
1. a kind of oil-gas transportation steel plate electromagnetic acoustic automatic checkout system, it is characterised in that:
Including multiple EMAT energy converters (10) and reference block (11)；
The multiple EMAT energy converter (10) is divided into main body energy converter group and two groups of edge energy converter groups, two groups of edge energy converter groups
It is located at the two sides of main body energy converter group；The EMAT energy converter (10) of main body energy converter group and two groups of edge energy converter groups is
Two rows, two rows of EMAT energy converter (10) Heterogeneous Permutations, and two rows of corresponding EMAT energy converters (10) keep at least 10% weight
It closes；The most marginal EMAT energy converter in main body energy converter group two sides is kept with the EMAT energy converter of corresponding edge energy converter group
At least 10% coincidence；
The reference block (11) includes steel plate, positions on steel plate, quantitatively processes artificial reflector, the artificial reflector includes
Multiple flat-bottom holes, multiple rectangle flat-bottom slots and at least one skewed slot.
2. a kind of oil-gas transportation according to claim 1 steel plate electromagnetic acoustic automatic checkout system, it is characterised in that: institute
It states EMAT energy converter (10) and chooses vertical magnetic field, double-spiral coil, the EMAT energy converter for generating SH wave.
3. a kind of oil-gas transportation according to claim 1 or 2 steel plate electromagnetic acoustic automatic checkout system, feature exist
In: reference block (11) outer dimension is identical with steel plate (3) size as oil-gas transportation to be measured.
4. a kind of oil-gas transportation according to claim 1 or 2 steel plate electromagnetic acoustic automatic checkout system, feature exist
In: the reference block (11) is welded using two blocks of steel plates.
5. a kind of oil-gas transportation according to claim 1 steel plate electromagnetic acoustic automatic checkout system, it is characterised in that: institute
It states multiple flat-bottom holes and is separately positioned on reference block (11) middle part and surrounding edge at sheet edge 25mm；It is arranged in plate
Flat-bottom hole in the middle part of material is three groups, one group of aperture 3mm, buried depth be respectively 1.5mm, 8.25mm, 16.5mm,
24.75mm and 31.8mm；
Aperture is one group of 6mm, and buried depth is respectively the flat of 1.5mm, 8.25mm, 16.5mm, 24.75mm and 31.8mm
Hole；Aperture is one group of 50mm, buried depth 16.5mm；
The multiple rectangle flat-bottom slot setting is in the middle part of reference block (11), width × length: 40mm × 80mm, buried depth point
Not Wei 8.25mm, 16.5mm and 24.75mm, laterally and longitudinally respectively setting half；
The skewed slot setting is in the middle part of reference block (11) and perforation plate width direction, width 6mm, buried depth are respectively
8.25mm, 16.5mm and 24.75mm.
6. a kind of oil-gas transportation according to claim 5 steel plate electromagnetic acoustic automatic checkout system, it is characterised in that: institute
The quantity for stating the flat-bottom hole that aperture is 50mm is 4.
7. a kind of oil-gas transportation steel plate electromagnetic acoustic automatic testing method, which comprises the following steps:
1) reference block is scanned, the detectability of test macro:
It is 1/4T, 2/4T and 3/4T using depth and distinguishes L apart from upper and lower surface depthOnAnd LUnderThe first flat-bottom hole, test
The detectability of system；
It is 1/4T, 2/4T and 3/4T using depth and distinguishes L apart from upper and lower surface depthOnAnd LUnderThe second flat-bottom hole production away from
From amplitude curve, the equivalent size of different depth defect is evaluated；
Using third flat-bottom holes multiple in the middle part of reference block (11), lamination defect in steel plate is simulated；
Using the rectangle flat-bottom slot for 80mm × 40mm that depth is 1/4T, 2/4T and 3/4T, folding in plate is simulated, white point lacks
It falls into；
Using entire strip width and depth is covered in system scanning direction of advance as the skewed slot of 1/4T, 2/4T and 3/4T, test
System scanning coverage rate and system dynamic detection ability and reliability；Wherein, T is the thickness of reference block, the LOn=
1.5mm,LUnder=1.2mm；
2) multiple EMAT energy converters (10) are scanned steel plate to be measured, obtain sweep waveform figure；
3) automatic evaluation:
3.1) the first gate is set, and starting point is located at beginning wave 1mm, and terminal is located at primary bottom wave 1mm, and height is sensitivity
60% wave height；Second gate is set, and starting point is located at primary bottom wavefront 1mm, and terminal is located at after primary bottom wave at 1mm, high
Degree is 60% wave height of sensitivity；
3.2) EMAT steel plate is carried out according to the test result in step 1) to detect, automatically record and automatic evaluation automatically.
8. a kind of oil-gas transportation steel plate electromagnetic acoustic automatic testing method according to claim 7, it is characterised in that: step
1) in, the diameter of the first flat-bottom hole is 3mm；The diameter of second flat-bottom hole is 6mm；The diameter of third flat-bottom hole is 50mm；Rectangle
Flat-bottom slot is having a size of 80mm × 40mm.
9. a kind of oil-gas transportation steel plate electromagnetic acoustic automatic testing method according to claim 8, it is characterised in that: step
3.2) automatic evaluation specifically: defective locations in steel plate are determined by the horizontal scale and vertical scale of C-scan, in conjunction with A
Scanning obtains Defect Equivalent value, carries out automatic evaluation to defect.
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