CN117705938A - Phased array ultrasonic flaw detection method for special-shaped thick-wall pipe - Google Patents

Phased array ultrasonic flaw detection method for special-shaped thick-wall pipe Download PDF

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Publication number
CN117705938A
CN117705938A CN202311602028.8A CN202311602028A CN117705938A CN 117705938 A CN117705938 A CN 117705938A CN 202311602028 A CN202311602028 A CN 202311602028A CN 117705938 A CN117705938 A CN 117705938A
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detector
defect
signal
comparison sample
phased array
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Inventor
王曼
张建龙
王宝顺
费凯诚
沈诚飞
涂正平
徐伟良
莫少华
杜雷
周珠
周际华
张燕燕
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Zhejiang Jiuli Metal Materials Research Institute Co ltd
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Zhejiang Jiuli Metal Materials Research Institute Co ltd
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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
    • 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
    • G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
    • 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
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • 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
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention aims to provide a phased array ultrasonic flaw detection method for a special-shaped thick-wall pipe, which comprises a STEP1 comparison sample setting STEP, a STEP2 artificial defect adding STEP, a STEP3 detector preliminary calibration STEP and a STEP4 detector calibration STEP. Wherein, STEP2 specifically is: the inner surface and the outer surface of the comparison sample piece are provided with a plurality of grooves cut along different directions, and the end face of the comparison sample piece is provided with a plurality of long transverse holes and flat bottom holes which are prepared along the extending direction of the thick-wall pipe. The device can restore the practical application scene better, is helpful for the detector to distinguish the interference signal and the defect signal better, and reduces the defect missing detection condition of boundary lines and corners. In addition, when the phased array ultrasonic detector is used for ultrasonic detection of complex structural members, the limitation that the coverage of the sound beam cannot be realized by moving the probe due to the limited contact surface can be effectively avoided.

Description

Phased array ultrasonic flaw detection method for special-shaped thick-wall pipe
Technical Field
The invention relates to the field of ultrasonic flaw detection methods, in particular to the field of ultrasonic flaw detection methods for special-shaped thick-wall pipes.
Background
The ultrasonic flaw detection technology is a nondestructive detection method and is mainly used for detecting defects, cracks, air holes and the like in materials. This technique generates reflection and scattering inside the material by introducing ultrasonic waves into the material to be detected. When the ultrasonic waves encounter defects inside the material, reflection and scattering occur, which are received by the detector and converted into electrical signals. From the received signal strength and time, the location, shape, size, and type of defect can be determined, and the internal structure and defect condition of the material can be determined by receiving and analyzing the reflected signal.
According to the circumferential ultrasonic inspection method for the thick-wall pipe fitting, which is disclosed in the patent No. CN 104316598A, an appropriate longitudinal wave incidence angle is selected, so that ultrasonic sound beams are focused on the inner wall of the thick-wall pipe fitting, and the defect detection of the thick-wall pipe fitting is realized.
However, for some special-shaped thick-wall pipes, the shape of the special-shaped thick-wall pipe is complex, and a plurality of boundary lines and corners exist, so that the propagation path of ultrasonic waves and signal reflection become complex, attenuation or multiple reflections of signals are caused, and interference signals are formed and received by a detector. This makes detection and analysis more difficult and it is not possible to distinguish whether the reflected signal is constituted by an interfering signal or a defective signal. And due to the curvature and profiled shape of the pipe, the ultrasound beam may deviate from the ideal propagation path and may not cover the entire surface of the pipe completely. This may result in the presence of undetected boundary line defects.
Disclosure of Invention
The invention aims to provide a phased array ultrasonic flaw detection method for a special-shaped thick-wall pipe, which can realize full-range coverage detection on a complex special-shaped pipe, can effectively distinguish interference signals and defect signals, and reduces occurrence of defect omission at boundary lines and corners.
The invention is realized by the following technical scheme:
the phased array ultrasonic flaw detection method for the special-shaped thick-wall pipe is characterized by comprising the following steps of:
STEP1: setting a comparison sample;
setting a corresponding comparison sample piece based on the special-shaped thick-wall pipe to be tested;
STEP2: an artificial defect adding step;
setting an artificial defect on the comparison sample;
STEP3: a preliminary calibration step of the detector;
detecting the comparison sample by using a detector, wherein the detector is a phased array ultrasonic detector, parameters of the detector are preliminarily adjusted to obtain a defect signal S1, a normal signal S2 and an interference signal S3, the defect signal S1 is an end face reflection signal of an area where the artificial defect is located, the normal signal S2 is an end face reflection signal of an area where the artificial defect is not located, and the interference signal S3 is a complex reflection signal formed by carrying out multiple reflections or attenuations on a plurality of surfaces of a special-shaped structure;
STEP4: a detector calibration step;
the parameters of the detector are subjected to secondary adjustment, and gain amplification is guaranteed to be obtained for all the defect signals S1 and the normal signals S2 through the secondary adjustment, so that the signal detection intensity of the defect signals S1 and the normal signals S2 is distinguished from the signal detection intensity of the interference signals S3;
STEP5: and carrying out defect detection on the special-shaped thick-wall pipe to be detected by the detector after final calibration is completed.
Based on the comparison sample piece with the same material, structure and size as the special-shaped thick-wall pipe to be detected, the artificial defect is arranged on the inner side, the outer side and the end face of the comparison sample piece, the artificial defect can be a dent with different shapes, sizes and depths, and the defect condition of the special-shaped thick-wall pipe possibly encountered in practical application is simulated. And detecting the comparison sample piece by using a phased array ultrasonic detector. The beam direction and the focal depth in the phased array ultrasonic wave are changed continuously along with the change of time, and the probe can also cover the sound beam in a larger angle range at the same position, so that the limitation that the sound beam coverage cannot be realized by moving the probe due to the limited contact surface is effectively avoided. The probe in the detector can be a mature bicrystal oblique probe in the prior art: 16 wafers, the wafer spacing is 0.1mm, the wafer aperture is 0.5mm, the artificial defects of the longitudinal grooves, the long transverse holes, the flat bottom holes and the size boundaries can be effectively detected, the defects can be accurately positioned, and then the detection results can be classified.
Parameters of the detector, such as probe frequency, pulse repetition frequency, gain, attenuation and the like, are preliminarily adjusted to obtain a defect signal S1 and a normal signal S2. And further calibrating parameters of the detector according to the defect signal S1 and the normal signal S2 to optimize the detection and display effects of the defect signal S1 and the normal signal S2. For example, the angle, the distance focus, the emission pulse width, the gain and other parameter values of the probe of the detector can be adjusted, and the height of the defect signal S1 and the normal signal S2 is adjusted to 80% of full screen, so that the defect signal S1 and the normal signal S2 can be more easily identified. However, the interference signal S3 obtained by multiple reflections at multiple boundary lines and corners is weakened and not easily observed due to the fact that the parameter adjustment is not performed by the detector, so that the purpose of identifying the interference signal S3 and the defect signal S1 is achieved.
According to the phased array ultrasonic flaw detection method for the special-shaped thick-wall pipe, the artificial defects are arranged on the inner side, the outer side and the end face of the comparison sample piece, so that the defect conditions of all special-shaped thick-wall pipes possibly encountered in practical application can be effectively simulated, and the artificial defect signals S1 of different types and sizes can be obtained. These signals can be used to analyze and understand the acoustic properties, such as amplitude, time, shape, etc., of the different defect types on the profiled thick-walled tube. The method is helpful for identifying and explaining the true defect signals in the complex structure, and effectively distinguishing the end face reflection from the defect reflection. Phased array ultrasound probe parameter optimization, such as probe angle, frequency, gain, etc., may also be performed. By adjusting these parameters, detection of defect signals can be enhanced to the greatest extent, and false alarms and false negatives can be reduced. In addition, for ultrasonic detection of complex structural members, the beam direction and the focal depth in phased array ultrasonic waves are changed continuously along with the change of time, and the probe can also cover a large angle range at the same position, so that the limitation that the probe cannot be moved to cover the sound beam due to the limitation of a contact surface is effectively avoided. In summary, the phased array ultrasonic flaw detection method for the special-shaped thick-walled pipe not only can realize full-range coverage detection on the complicated special-shaped thick-walled pipe, but also can effectively identify the defect signal S1 and the interference signal S3, and reduce the defect missing detection condition of boundary lines and corners.
As a preferred aspect of the present invention, STEP2 specifically comprises: the inner surface and the outer surface of the comparison sample piece are provided with a plurality of grooves cut along different directions, and the end face of the comparison sample piece is provided with a plurality of long transverse holes and flat bottom holes which are prepared along the extending direction of the thick-wall pipe.
In order to ensure that the defects of the inner surface and the outer surface of the special-shaped thick-wall pipe can be identified by 100%, and meanwhile, the irregular shape of the special-shaped pipe is considered. Therefore, the inner surface and the outer surface of the comparison sample piece are provided with a plurality of grooves cut along different directions, and a plurality of long transverse holes and flat bottom holes along the extending direction of the thick-wall pipe are prepared at the end face positions so as to simulate the defects of cracks, welding seams, bubbles, layering and the like in the special-shaped thick-wall pipe in the practical application scene. Different types of defects may produce different characteristics in the echo signal so that defect detection and assessment may be performed. Therefore, the artificial defects arranged in the comparison sample can better restore the actual application scene, so that the detector can better distinguish the interference signal S3 from the defect signal S1, and the defect missing detection condition of boundary lines and corners is reduced.
Preferably, the groove comprises a transverse groove and a longitudinal groove, the long side of the transverse groove is parallel to the extending direction of the comparison sample piece, the long side of the longitudinal groove is perpendicular to the extending direction of the comparison sample piece, and the depth setting interval of the groove is as follows: and 4% -6% of the wall thickness of the region where the comparison sample piece is located.
The transverse grooves and the longitudinal grooves are formed in the comparison sample, the depth is set to be 4% -6% of the thickness of the area where the transverse grooves and the longitudinal grooves are located, defects, such as welding seams, cracks and corrosion, of the special-shaped thick-wall pipe in an actual application scene can be better simulated and reduced, the defects of the special-shaped thick-wall pipe can be comprehensively detected, and effective evaluation of an ultrasonic detection system is provided.
Preferably, the artificial defect is arranged at the junction of two different planes of the comparison sample piece and at the end face of the comparison sample piece with different wall thicknesses.
Since the junction of two flat surfaces and the end surface are sensitive areas where defects may exist in the special-shaped thick-wall pipe, problems such as poor material bonding, welding defects, corrosion or fatigue cracks at the thin wall and the like may exist at the positions. Providing artificial defects may help assess the defect assessment capabilities of the ultrasound probe system. And the artificial defects are arranged at the end faces with different wall thicknesses, so that the response capability of the detection system to different materials and wall thickness changes can be determined, and whether the defects can be accurately detected or not can be determined.
As a preferred aspect of the present invention, STEP3 is specifically: and detecting the artificial defect through at least two different focusing rules, and determining the focusing rule applied to detecting the comparison sample according to the detection result, wherein the detection result comprises the amplitude parameter and the waveform of the defect signal S1.
The focusing principle is a set of principles for controlling the shape and focusing power of an ultrasound beam. The following are some focusing rules common in the prior art: isochronous focusing rules, pulse compression rules, acoustic lens rules, etc. These focusing rules may be selected and adjusted according to specific application requirements. And detecting the artificial defect by at least two different focusing rules, and selecting a proper focusing rule according to a detection result to obtain an optimal focusing effect, thereby being beneficial to better detecting the defect by the detector.
Preferably, the STEP4 further comprises: the lower of the defect signal S1 and the normal signal S2 values is determined as the rejection level value of the detector.
The rejection level refers to the lowest signal strength that the detector can recognize and process, below which signals are considered noise or interference and are ignored, so that part of the interference signal S3 with lower signal strength can be filtered to better identify the defect signal S1 and the interference signal S3.
Preferably, the STEP4 further comprises: and adjusting the position of an alarm gate in the detector to cover the defect signal S1.
The alarm gate is an area set in ultrasonic detection, and an alarm is triggered when the signal intensity in the area exceeds a set threshold. By adjusting the alarm gate position, the response range of the detector to different signal strengths can be determined. When the alarm gate position is set too small, only if the signal strength exceeds a higher threshold value, an alarm is triggered, which may cause a smaller or weaker defect signal S1 to be ignored, thereby causing missed judgment. Conversely, when the alarm gate position is set too large, noise or interference with low signal strength may trigger an alarm, which may lead to erroneous judgment. Therefore, the position of the alarm gate is adjusted to reduce erroneous judgment and missed judgment as much as possible while ensuring that the detector can detect the defect signal S1 and alarm.
As a preferred aspect of the present invention, the method further comprises a dynamic calibration STEP following STEP4: the detector carries out spiral propulsion detection along the extending direction of the pipeline, and parameters of the detector are adjusted to ensure that the comparison sample piece is subjected to full-coverage flaw detection and avoid the condition of missing detection of the artificial defect.
In order to simulate the real situation when the product is inspected, the detector needs to be calibrated in a dynamic state. Therefore, the detector is subjected to spiral propulsion detection relative to the comparison sample, so that the sample detection in a real environment can be effectively and truly simulated, the calibration of the detector is more accurate, and the detector is more sensitive to defect detection. And spiral scanning detection can ensure that the detection range of the detector can cover the comparison sample piece by 100%, so that the defect missing detection condition of boundary lines and corners is reduced.
In summary, the novel structure of the invention has the following beneficial effects:
1. through phased array ultrasonic flaw detection technology, can realize linear scanning, fan-shaped scanning and dynamic depth focusing to possess wide wave beam and multifocal characteristic simultaneously, the region that once can scan is big, realizes the full range coverage detection to complicated abnormal shape tubular product.
2. The artificial defects of different shape structures are arranged on the comparison sample piece and are used for analyzing and understanding the acoustic characteristics of different defect types on the special-shaped thick-wall pipe, so that the identification and interpretation of the true defect signals in the complex structure are facilitated, and the end face reflection and the defect reflection are effectively distinguished.
3. The artificial defects are arranged in the sensitive areas which possibly have defects at the junction of the two planar hairs and the end face, so that the defect evaluation capability of the ultrasonic detection system can be better evaluated.
4. The artificial defects are arranged on the end faces of different wall thicknesses, so that the defect response capability of the detection system to the change of the different wall thicknesses can be determined, and the accuracy of detecting the defects is improved.
5. And (3) calibrating the equipment of the detector in a dynamic state so as to simulate the real situation of product inspection, so that the calibration of the detector is more accurate and the detector is more sensitive to defect detection.
Drawings
FIG. 1 is a schematic view of a lateral groove arrangement;
FIG. 2 is a schematic view of a longitudinal groove arrangement;
FIG. 3 is a schematic end view of an elongated transverse bore arrangement;
FIG. 4 is a schematic side view of a flat bottom hole arrangement.
In the figure: 1. transverse grooves, 2, longitudinal grooves, 3, long transverse holes, 4 and flat bottom holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention relates to an ultrasonic flaw detection method for a special-shaped thick-wall pipe, and an irregular shape of an external octagon and an internal circle is described as an example, and the specific embodiment is only for explaining the invention, and is not a limitation of the invention, and other special-shaped thick-wall pipes can be equivalently replaced. Modifications of the embodiments which do not creatively contribute to the invention may be made by those skilled in the art after reading the present specification, but are protected by patent laws within the scope of the claims of the present invention.
Based on the special-shaped thick-wall pipe to be measured, the comparison sample pieces with the same materials, structures and sizes are arranged, and artificial defects are arranged on the inner side, the outer side and the end face of the comparison sample pieces. As shown in fig. 1 and 2, transverse grooves 1 and longitudinal grooves 2 are provided on the inner and outer surfaces of the comparative sample. In order to ensure that the defects of the inner surface and the outer surface of the special-shaped thick-wall pipe can be identified by 100 percent, and meanwhile, 5 percent of the special-shaped material is considered. And are evenly distributed on each plane and at the junctions of the different planes. In the present embodiment, the transverse grooves 1 are provided in length×width×depth=35×0.50×1.00mm, and the longitudinal grooves 2 have the dimensions: length x width x depth = 35 x 0.50 x 1.00mm.
As shown in fig. 2, a long transverse hole artificial 3 defect and a flat bottom hole 4 along the extending direction of the pipe were prepared at the end faces of two different wall thicknesses on the comparative sample. The length of the long transverse hole 3 is 25.4mm, the aperture phi is 1.2mm, and the positions of the long transverse hole are respectively 3.5mm away from the outer wall of the pipe, 2mm away from the inner wall of the pipe and 1/2 of the wall thickness of the pipe. Ensure that the defect inside the wall thickness of the special-shaped thick-wall pipe can realize 100 percent ultrasonic coverage rate. The flat bottom aperture phi 2.0mm is located at 1/4 of the wall thickness, at 3/4 of the wall thickness and at 1/2 of the wall thickness, respectively. The ultrasonic coverage rate of 100% can be realized at the junction of the layering defect and the long and short edges inside the wall thickness of the special-shaped thick-wall pipe.
The phased array ultrasonic detector is used for detecting the comparison sample piece, and the detection result is optimized by calibrating the parameters of the detector, and the method is specifically as follows:
1) Static calibration of flaw detection of transverse grooves 1 and longitudinal grooves 2
The parameters of the detector, such as probe frequency, pulse repetition frequency, gain, attenuation and the like, are preliminarily adjusted, and the transverse grooves 1 and the longitudinal grooves 2 are detected by utilizing two focusing rules. And determining a focusing rule applied to detecting the comparison sample piece according to the detection result, namely the amplitude parameter and the waveform of the defect signal S1, and detecting other areas without artificial defects. The reflected signals are the primary end surface reflected wave and the secondary end surface reflected wave, and the signals are marked as normal signals S2. And further calibrating parameters of the detector according to the defect signal S1 and the normal signal S2 to optimize the detection and display effects of the defect signal S1 and the normal signal S2. For example, the angle, the distance focus, the emission pulse width, the gain and other parameter values of the probe of the detector can be adjusted, and the heights of the defect signal S1 and the normal signal S2 are adjusted to 80% of full screen, so that the defect signal S1 and the normal signal S2 can be more easily identified. However, the interference signal S3 obtained by multiple reflections at multiple boundary lines and corners is weakened and not easily observed due to the fact that the parameter adjustment is not performed by the detector, so that the purpose of identifying the interference signal S3 and the defect signal S1 is achieved.
2) Static calibration of long transverse hole 3 flaw detection
The long transverse hole 3 is detected by preliminarily adjusting parameters of the detector, such as probe frequency, pulse repetition frequency, gain, attenuation and the like, and utilizing two focusing rules. And determining a focusing rule applied to detecting the comparison sample piece according to the detection result, and detecting other areas without artificial defects. And further calibrating parameters of the detector according to the defect signal S1 and the normal signal S2 to optimize the detection and display effects of the defect signal S1 and the normal signal S2. For example, the angle, distance focus, emission pulse width, gain and other parameter values of the probe of the detector can be adjusted, and the height of the defect signal S1 and the normal signal S2 can be adjusted to 80% of full screen.
3) Static calibration for flaw detection of flat bottom hole 4
The flat bottom hole 4 is detected by preliminarily adjusting parameters of the detector, such as probe frequency, pulse repetition frequency, gain, attenuation, etc., and using two focusing rules. And determining a focusing rule applied to detecting the comparison sample piece according to the detection result, and detecting other areas without artificial defects. And further calibrating parameters of the detector according to the defect signal S1 and the normal signal S2 to optimize the detection and display effects of the defect signal S1 and the normal signal S2. For example, the angle, distance focus, emission pulse width, gain and other parameter values of the probe of the detector can be adjusted, and the height of the defect signal S1 and the normal signal S2 can be adjusted to 80% of full screen.
4) Dynamic calibration
In order to simulate the real situation when the product is inspected, the detector needs to be calibrated in a dynamic state. Therefore, the detector is subjected to spiral propulsion detection relative to the comparison sample piece, and the forward speed is constant within 150 mm/s. The method can effectively simulate the sample detection in the real environment, so that the calibration of the detector is more accurate and the defect detection is more sensitive. And spiral scanning detection can ensure that the detection range of the detected instrument can cover the comparison sample piece by 100%, so that the defect missing detection condition of boundary lines and corners is reduced.
And carrying out defect detection on the special-shaped thick-wall pipe to be detected by using the detector which is finally calibrated.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (8)

1. The phased array ultrasonic flaw detection method for the special-shaped thick-wall pipe is characterized by comprising the following steps of:
STEP1: setting step of contrast sample
Setting a corresponding comparison sample piece based on the special-shaped thick-wall pipe to be tested;
STEP2: step of adding artificial defect
Setting an artificial defect on the comparison sample;
STEP3: preliminary calibration step of detector
Detecting the comparison sample by using a detector, wherein the detector is a phased array ultrasonic detector, parameters of the detector are preliminarily adjusted to obtain a defect signal S1, a normal signal S2 and an interference signal S3, the defect signal S1 is an end face reflection signal of an area where the artificial defect is located, the normal signal S2 is an end face reflection signal of an area where the artificial defect is not located, and the interference signal S3 is a complex reflection signal formed by carrying out multiple reflections or attenuations on a plurality of surfaces of a special-shaped structure;
STEP4: calibration step of detector
The parameters of the detector are subjected to secondary adjustment, and gain amplification is guaranteed to be obtained for all the defect signals S1 and the normal signals S2 through the secondary adjustment, so that the signal detection intensity of the defect signals S1 and the normal signals S2 is distinguished from the signal detection intensity of the interference signals S3;
STEP5: and carrying out defect detection on the special-shaped thick-wall pipe to be detected by the detector after final calibration is completed.
2. The phased array ultrasonic inspection method for profiled thick-walled tubes of claim 1 wherein STEP2 is specifically: the inner surface and the outer surface of the comparison sample piece are provided with a plurality of grooves cut along different directions, and the end face of the comparison sample piece is provided with a plurality of long transverse holes (3) and flat bottom holes (4) which are prepared along the extending direction of the thick-wall pipe.
3. The phased array ultrasonic flaw detection method for a special-shaped thick-walled pipe according to claim 2, wherein the groove comprises a transverse groove (1) and a longitudinal groove (2), the long side of the transverse groove (1) is parallel to the extending direction of the comparison sample, the long side of the longitudinal groove (2) is perpendicular to the extending direction of the comparison sample, and the depth setting interval of the groove is as follows: and 4% -6% of the wall thickness of the region where the comparison sample piece is located.
4. The phased array ultrasonic flaw detection method for a special-shaped thick-walled pipe according to claim 1 wherein the artificial flaw is provided at the junction of two different planes of the comparison sample and at the end face where the different wall thicknesses are located.
5. The phased array ultrasonic inspection method for profiled thick-walled tubes of claim 1 wherein STEP3 is specifically: and detecting the artificial defect through at least two different focusing rules, and determining the focusing rule applied to detecting the comparison sample according to the detection result, wherein the detection result comprises the amplitude parameter and the waveform of the defect signal S1.
6. The phased array ultrasonic inspection method for profiled thick-walled tubes of claim 1 wherein the STEP4 further comprises: the lower of the defect signal S1 and the normal signal S2 values is determined as the rejection level value of the detector.
7. The phased array ultrasonic inspection method for profiled thick-walled tubes of claim 1 wherein the STEP4 further comprises: and adjusting the position of an alarm gate in the detector to cover the defect signal S1.
8. The phased array ultrasonic inspection method for profiled thick-walled tubes of any of claims 1-7 further comprising a dynamic calibration STEP following STEP4: the detector carries out spiral propulsion detection along the extending direction of the pipeline, and parameters of the detector are adjusted to ensure that the comparison sample piece is subjected to full-coverage flaw detection and avoid the condition of missing detection of the artificial defect.
CN202311602028.8A 2023-11-28 2023-11-28 Phased array ultrasonic flaw detection method for special-shaped thick-wall pipe Pending CN117705938A (en)

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CN202311602028.8A CN117705938A (en) 2023-11-28 2023-11-28 Phased array ultrasonic flaw detection method for special-shaped thick-wall pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311602028.8A CN117705938A (en) 2023-11-28 2023-11-28 Phased array ultrasonic flaw detection method for special-shaped thick-wall pipe

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Publication Number Publication Date
CN117705938A true CN117705938A (en) 2024-03-15

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