CN119000861A - Ultrasonic detection method for pressure pipe - Google Patents
Ultrasonic detection method for pressure pipe Download PDFInfo
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- CN119000861A CN119000861A CN202410979379.9A CN202410979379A CN119000861A CN 119000861 A CN119000861 A CN 119000861A CN 202410979379 A CN202410979379 A CN 202410979379A CN 119000861 A CN119000861 A CN 119000861A
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- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 230000007547 defect Effects 0.000 claims abstract description 138
- 239000000523 sample Substances 0.000 claims abstract description 74
- 238000005516 engineering process Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 15
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 20
- 238000007689 inspection Methods 0.000 abstract description 8
- 238000007654 immersion Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000011002 quantification Methods 0.000 description 8
- 239000000446 fuel Substances 0.000 description 7
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052805 deuterium Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
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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
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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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
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
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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
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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
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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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
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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- General Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (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
一种用于压力管的超声检测方法。本发明涉及压力管检测技术领域，旨在解决传统检测效率低、缺陷定量准确性不足、缺乏智能化的问题。本发明提供了一种用于压力管的自动超声检测方法，在一体式探头组件上布置一组超声探头；利用参考试块上的内表面槽、外表面槽制作TGC曲线；超声数据采集时，一体式探头组件带动超声探头在压力管内以螺旋运动方式进行扫查；在分析软件中打开数据并设置好分析视图，对超声数据进行分析；判断缺陷的性质；测量缺陷轴向方向尺寸和缺陷周向方向尺寸；计算缺陷高度。本发明能够快速、准确地检测压力管中的缺陷，从压力管内侧实施检验，采用水浸式超声检测方法，避免小直径管道内探头直接接触造成的超声波耦合不佳问题。
An ultrasonic detection method for pressure pipes. The present invention relates to the field of pressure pipe detection technology, and aims to solve the problems of low efficiency, insufficient quantitative accuracy of defects, and lack of intelligence in traditional detection. The present invention provides an automatic ultrasonic detection method for pressure pipes, wherein a group of ultrasonic probes are arranged on an integrated probe assembly; a TGC curve is produced by using the inner surface grooves and outer surface grooves on a reference test block; during ultrasonic data acquisition, the integrated probe assembly drives the ultrasonic probe to scan in a spiral motion in the pressure pipe; the data is opened in the analysis software and the analysis view is set, and the ultrasonic data is analyzed; the nature of the defect is determined; the axial dimension of the defect and the circumferential dimension of the defect are measured; and the defect height is calculated. The present invention can quickly and accurately detect defects in pressure pipes, implement inspections from the inside of the pressure pipe, and adopt a water immersion ultrasonic detection method to avoid the problem of poor ultrasonic coupling caused by direct contact of the probe in a small diameter pipe.
Description
Technical Field
The invention relates to the technical field of pressure pipe detection, in particular to an ultrasonic detection method for a pressure pipe.
Background
The reactor core of the heavy water reactor nuclear power plant is characterized by using a pressure pipe (instead of a pressure vessel of a pressurized water reactor), using heavy water as a moderator and a coolant, using natural uranium as fuel, and adopting non-stop reactor to replace fuel. The reactor core of each unit has 380 horizontally arranged fuel passages, each fuel passage mainly consisting of 1 pressure tube, 2 end pieces, 1 calandria and 4 positioning clamp springs separating the calandria from the pressure tube. The pressure pipe is made of Zr-2.5Nb alloy, the working temperature is 266-312 ℃, and the maximum working pressure is 11.48MPa; the pressure tube had a length of about 6.4M, an inner diameter of about 103.4mm and a wall thickness of 4.2mm. During operation of the unit, the fuel passage pressure tube is in a high-temperature, high-pressure and high-irradiation operation environment for a long time, so that the size and material performance of the pressure tube can be changed, during the unit material changing process, the moving-in/out operation of the fuel rod bundles can wear the inner wall of the pressure tube, and in addition, the pressure tube can absorb part of deuterium during operation, so that the pressure tube can wear, deform, absorb hydrogen and change the material performance during service. At least 10 fuel passage pressure pipes must be selected for in-service inspection every 6 years as specified by the heavy water reactor nuclear power plant in-service inspection code. Because the pressure pipe has small inner diameter and thin wall thickness, the pressure pipe is in high-temperature, high-pressure and high-irradiation environment during in-service inspection, and a plurality of difficulties exist in implementing ultrasonic detection. In the full-volume ultrasonic inspection of pressure pipes, due to the extremely high requirements on inspection accuracy, not only are the allowable defect type sizes strictly controlled, but attention must be paid to how to more accurately measure these sizes. Therefore, the development of an efficient and intelligent automatic ultrasonic detection method has important significance for improving the safety and reliability of the pressure pipe.
Disclosure of Invention
The invention aims to provide an ultrasonic detection method for a pressure pipe, which solves the problems of low detection efficiency, insufficient defect quantification accuracy and lack of intellectualization in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
an automatic ultrasonic detection method for a pressure tube, comprising:
step 1: arranging a group of ultrasonic probes on the integrated probe assembly;
step 2: utilizing the inner surface groove and the outer surface groove on the reference test block to manufacture a TGC curve;
Step 3: when the ultrasonic data are acquired, the integrated probe assembly drives the ultrasonic probe to scan in the pressure pipe in a spiral motion mode;
step 4: opening data in analysis software, setting analysis view, and analyzing ultrasonic data;
Step 5: judging the nature of the defect;
step 6: measuring the axial direction size of the defect and the circumferential direction size of the defect;
step 7: the defect height is calculated.
In some embodiments, the ultrasound probe is fixedly mounted to a probe mounting hole site of the integrated probe assembly.
In some embodiments, at the time of ultrasonic detection, a set of ultrasonic probes in the probe assembly form 2 45 ° ultrasonic detection circumferential beams, 2 45 ° ultrasonic detection axial beams, and 20 ° ultrasonic detection radial beams.
In some embodiments, the reference block has a slot length of 6.0mm, a width of 0.15mm, and a depth of 0.15mm.
In some embodiments, in step 3, when the integrated probe assembly scans, the scanning sampling rate is less than or equal to 1.0 degrees, the pitch is less than or equal to 1.0mm, and the rotation speed is more than or equal to 360 degrees/s.
In some embodiments, in step 4, after the interface wave signal time domain synchronization processing technology and the echo superposition amplitude screening technology are adopted for processing, display characteristic information is extracted, so that visual and accurate identification and judgment of defects are realized.
In some embodiments, filtering and denoising preprocessing are performed on the collected interfacial wave signals, and by setting an accurate signal gate mechanism, the real-time position T0 of the interfacial wave signals is captured and synchronized to a preset fixed time position T1, so that the wavy water steel interfacial waves at each position are effectively converted into water steel interfacial waves in a horizontal form, and time domain synchronous processing of the interfacial wave signals is realized.
In some embodiments, in step 6, the circumferential dimension L mm of the defect is measured by using a maximum echo amplitude-6 dB method of the circumferential sound beam probe, and the circumferential dimension L deg of the defect is measured by using a maximum echo amplitude-6 dB method of the axial sound beam probe, and the calculation formula is as follows:
Lmm＝Ldeg×(D×π)/360；
Wherein L mm is the dimension in the circumferential direction of the defect; l deg is the central angle corresponding to the defect circumferential direction; when the defect is an inner/outer surface defect, D is the inner/outer diameter of the tested part; in the case of a buried defect, D is the diameter corresponding to the center in the depth direction of the defect.
In some embodiments, in step 7, if the defect is a buried defect, the defect height value h=z2-Z1, where Z1 is the defect upper endpoint signal depth value and Z2 is the lower endpoint signal depth value.
In some embodiments, in step 7, if the defect is an inner surface defect, the defect height value h=z2 '-z1', where Z1 'is the pressure tube inner wall end angle signal depth value at the defect and Z2' is the defect lower end point signal depth value.
In some embodiments, in step 7, if the defect is an external surface defect, the defect height value h=z2 "-z1", where Z1 "is the defect upper endpoint signal depth value and Z2" is the defect pressure tube external wall endpoint signal depth value.
Compared with the prior art, the ultrasonic detection method for the pressure pipe has the following beneficial effects:
The invention can rapidly and accurately detect the defects in the pressure pipe.
The invention carries out inspection from the inner side of the pressure pipe, and adopts a water immersion type ultrasonic detection method to avoid the problem of poor ultrasonic coupling caused by direct contact of probes in a small-diameter pipeline.
The invention adopts a specific method aiming at different types of probes to measure the length and the height of the defect, thereby improving the accuracy of defect size quantification.
Aiming at the characteristics of water immersion ultrasonic detection, the invention designs a probe inspection sensitivity setting method, ensures high sensitivity and signal to noise ratio during defect detection, and improves reliability.
Furthermore, the invention adopts the point focusing probe, can focus the energy of the sound beam and then make the energy incident into the pressure pipe, and can more sensitively detect the defect of small size.
Furthermore, the invention adopts the narrow pulse broadband probe with the frequency of 10-15 MHz, thereby improving the resolution and the signal-to-noise ratio of the ultrasonic signals.
Furthermore, the probe is arranged on the integrated probe assembly structure, and respectively enters the pressure pipe through 45-degree transverse waves and 0-degree longitudinal waves, so that the detected area of the pressure pipe can be fully covered.
Furthermore, 2 circumferential probes, 2 axial probes and 2 radial probes are arranged in the limited space of the pressure pipe, so that simultaneous data acquisition of multiple probes is realized, and the ultrasonic detection efficiency is greatly improved.
Further, during detection, the probe adopts a high-speed spiral scanning mode to scan at a speed not lower than 360 degrees/s, and the detection rate is high.
Furthermore, the invention adopts interface wave signal time domain synchronous processing technology and echo superposition amplitude screening technology, can accurately and intelligently analyze, identify and judge the display signal characteristics on the pressure pipe, and improves the analysis efficiency.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the following brief description will be given of the drawings that are used in the technical description.
FIG. 1 is a schematic view of a pressure tube construction;
FIG. 2 is a schematic diagram of an integrated probe assembly;
FIG. 3 is a schematic view of an ultrasonic detection beam;
FIG. 4 is a schematic view of a spiral scan;
FIG. 5 is a schematic diagram of an interface wave signal time domain synchronization processing technique;
FIG. 6 is a schematic diagram of an echo superimposed amplitude screening technique;
FIG. 7 is a schematic diagram of defect axial dimension quantification;
FIG. 8 is a schematic diagram of defect circumferential dimension quantification;
FIG. 9 is a schematic diagram of defect height quantification.
Reference numerals illustrate:
1. A pressure pipe; 2. a pressure tube end part; 3. an integral probe assembly; 4. an ultrasonic probe; 5. a probe mounting hole site; 6. ultrasonic detecting circumferential sound beams; 7. ultrasonic detection of axial sound beams; 8. ultrasonic detecting radial sound beams; 9. synchronously processing the front water steel interface wave in a time domain; 10. water steel interface wave after time domain synchronous treatment; 11. defects; 12. an inner surface; 13. an outer surface; 14. burial defects; 15. an inner surface planar defect; 16. internal surface volume defects; 17. surface planar defects; 18. external surface volume type defects.
Detailed Description
Further details are provided below with reference to the specific embodiments.
As shown in fig. 1, the pressure tube end section 2 is connected to the pressure tube 1 by expansion and supports the pressure tube 1, requiring ultrasonic testing of the full length of the pressure tube as required by the specifications. The invention firstly prepares a set of automatic ultrasonic detection equipment, which comprises an ultrasonic probe, an ultrasonic cable, a data acquisition and analysis workstation and a multichannel ultrasonic instrument capable of feeding back operation codes.
As shown in fig. 1 to 9, the present invention provides an ultrasonic testing method for a pressure tube, comprising the steps of:
step 1: according to the specification parameters of the pressure pipe, a water immersion point focusing probe with the frequency of 10-15 MHz (an ultrasonic probe 4 adopts a water immersion point focusing probe) is adopted, and the focal length is selected within the range of 10-40 mm according to the requirement. A total of 6 ultrasonic probes 4 are sequentially installed in the probe installation hole sites 5 of the integrated probe assembly 3 and fastened, as shown in fig. 2. Through arranging a plurality of probes at one time, the simultaneous data acquisition of a plurality of probes is realized, and the ultrasonic detection efficiency is greatly improved. Wherein the 2 probes are oppositely arranged along the axial direction of the pressure pipe, and the transmitting/receiving surfaces of the probes are along the central axial direction of the pressure pipe; the 2 probes are oppositely arranged along the circumferential direction of the pressure pipe, and the transmitting/receiving surfaces of the probes are along the circumferential direction of the pressure pipe; the other 2 probes are oppositely arranged along the radial direction of the pressure tube, and the transmitting/receiving surfaces of the probes are along the radial section of the pressure tube. At the same time according to the snell law, namely: sin θ2/sin θ1=v2/V1 (where θ1 is an incident angle of the sound beam, θ2 is an refraction angle of the sound beam, V1 and V2 are sound velocities in the water and the pressure tube, respectively), the calculated incident angle θ1 (θ1=arcsin (V1/V2×sin θ2) based on the known sound velocities V1 and V2 and the desired incident angle θ2, and the probe inclination angle is adjusted to θ1, so that 2 ultrasonic-detected circumferential sound beams 6 with an incident angle of 45 ° (θ2) can be formed, 2 ultrasonic-detected axial sound beams 7 with an incident angle of 45 ° (θ2) and 2 ultrasonic-detected radial sound beams 8 with an incident angle of 0 ° (θ2) can be formed at the time of ultrasonic detection, as shown in fig. 3.
Step 2: the reference test block is made of a pressure pipe with the same material and the same geometric shape as the pressure pipe to be detected, and an inner surface groove and an outer surface groove which are 6.0mm long, 0.15mm wide and 0.15mm deep on the reference test block are used for making a TGC curve, namely a distance-gain curve. In order to avoid interference of water steel interface waves, secondary wave signals are adopted for calibrating the inner surface groove.
Step 3: during ultrasonic data acquisition, the probe assembly (the integrated probe assembly 3) drives the probe ultrasonic probe to scan in the pressure pipe in a spiral motion mode, as shown in fig. 4, the scanning sampling rate is less than or equal to 1.0 degrees, the pitch is less than or equal to 1.0mm, and the rotating speed is not less than 360 degrees/s. The acquisition can be accomplished by dividing the detection range along the length of the tube into several regions in the axial direction of the pressure tube 1 to control the size of the acquired data file, and the data is stored after the acquisition is completed.
Step 4: the data are opened in the existing analysis software, analysis views are set, and the ultrasonic data are analyzed. And after the interface wave signal time domain synchronous processing technology and the echo superposition amplitude screening technology are adopted for processing, the display characteristic information is extracted, so that the visual and accurate identification and judgment of the defects are realized.
The invention adopts interface wave signal time domain synchronous processing technology: because the probe assembly can generate certain eccentricity in the rotating process, the water steel interface wave of the ultrasonic sound beam can be fluctuated up and down along with the change of the water sound path to form wave-shaped water steel interface wave (water steel interface wave 9 before time domain synchronous processing) in the B-scan signal diagram, and different wave-shaped interface waves are generated at different positions during spiral scanning, so that the inconvenience is brought to the automatic identification and analysis of defect signals. In order to solve the problem, the collected interface wave signals are filtered and denoised to eliminate the influence of the environmental clutter high-frequency noise and the electromagnetic interference noise and improve the quality of the signals. Then, by setting an accurate signal gate mechanism, the real-time position T0 of the interfacial wave signal is captured and synchronized (time position T0) to a fixed time position T1 set in advance. This process ensures that the wavy water steel interface wave (water steel interface wave 9 before time domain synchronization processing) at each location is effectively converted into a water steel interface wave (water steel interface wave 10 after time domain synchronization processing) in a horizontal form, as shown in fig. 5, thereby achieving time domain synchronization processing of interface wave signals. After the detection data is subjected to the interface wave signal time domain synchronization processing, the comparison work of signal characteristics is greatly simplified, defect signals can be rapidly and accurately identified and positioned, and the accuracy and the efficiency of ultrasonic detection are greatly improved.
The invention adopts the echo superposition amplitude screening technology: the technique generates a C-scan signal map (signal superposition map of horizontal cross section) by performing superposition processing on all ultrasonic signals within a specific depth range. In the signal diagram, the amplitude of the signal corresponds to the two-color spectrum accurately, so that the intensity of the signal can be visually and clearly displayed. By presetting a signal amplitude recording threshold value, the display signals reaching or exceeding the threshold value can be rapidly and automatically screened out, and the processing technology greatly improves the efficiency of data processing, thereby realizing high-efficiency and rapid data processing and signal automatic analysis, as shown in fig. 6.
Step 5: and (5) defect characterization.
The reflected signal of the longitudinal wave probe is weak or even not, and the sound beam of the transverse wave probe finds out the diffraction signal of the end point, so that the display is judged to be a planar defect; the reflected signal of the longitudinal wave probe is stronger, and the dynamic range of the echo signal of the transverse wave probe is relatively smaller, so that the display of the defect is judged to be a volume defect; the echo amplitude of the longitudinal wave probe is the largest, the echo amplitude of the transverse wave probe is weaker, and the difference of the amplitude of the two is larger, so that the display of the layering defect can be judged. By combining the above technical principles, the nature of the defect 11 can be determined.
Step 6: and quantitatively measuring the axial direction size of the defect and quantitatively measuring the circumferential direction size of the defect.
The defect axial direction dimension L mm is measured using the circumferential beam probe maximum echo amplitude-6 dB method, as shown in fig. 7.
The defect circumferential dimension L deg is measured using the axial beam probe maximum echo amplitude-6 dB method, as shown in fig. 8. The size of the defect in the circumferential direction should be calculated by the following formula:
Lmm＝Ldeg×(D×π)/360；
L mm: the size of the defect in the circumferential direction;
L deg: central angles corresponding to the circumferential direction of the defects;
d: when the defect is an inner/outer surface defect, D is the inner/outer diameter of the tested part; in the case of a buried defect, D is the diameter corresponding to the center in the depth direction of the defect.
Step 7: defect height quantification. The inner surface 12 of the pressure tube 1 has inner surface planar defects 15 and inner surface volumetric defects 16 and the outer surface 13 of the pressure tube 1 has outer surface planar defects 17 and outer surface volumetric defects 18. The pressure tube 1 also has a buried defect 14.
The surface planar defects include inner surface planar defects 15 on the inner surface 12 and outer surface planar defects 17 on the outer surface 13. The surface planar defects mainly refer to defects having two-dimensional characteristics such as cracks, scratches, etc. located at the inner and outer wall surfaces of the pressure tube 1. Such defects typically propagate along a plane of the tube wall, which may be smaller in depth compared to the thickness of the tube wall, but may be larger in length. Surface planar defects can reduce the overall performance and service life of the pressure tube.
The surface-volume type defects include an inner surface-volume type defect 16 on the inner surface 12 and an outer surface-volume type defect 18 on the outer surface 13. Surface volume type defects refer to defects having three-dimensional characteristics, such as pores, abrasion, etc., located at the inner and outer wall surfaces of the pressure tube 1. Such defects are not only present in a certain plane of the pipe wall, but also occupy a certain space in the depth direction.
The buried defects 14 refer to defects located inside the pressure tube 1 and exposed neither at the inner nor outer surface, and such defects include internal cracks and the like. Since buried defects are not easily found and detected, they constitute a significant risk to the safe operation of pressure pipes.
(1) If the defect is a buried defect 14, the defect height value h=z2-Z1. Z1 is the depth value of the defect upper endpoint signal, and Z2 is the depth value of the lower endpoint signal, as shown in FIG. 9.
(2) If the defect is an inner surface defect (inner surface planar defect 15, inner surface volume defect 16), the defect height value h=z2 '-Z1'. Z1 'is the signal depth value of the end angle of the inner wall of the pressure pipe at the defect, and Z2' is the signal depth value of the end point under the defect, as shown in FIG. 9.
(3) If the defect is an external surface defect (external surface planar defect 17, external surface volumetric defect 18), the defect height value h=z2 "-Z1". Z1 'is the signal depth value of the upper end point of the defect, and Z2' is the signal depth value of the outer wall end angle of the pressure pipe at the defect, as shown in FIG. 9.
TWE is Through Wall Extent in FIG. 9, height along the wall thickness direction.
The invention provides a high-efficiency intelligent automatic ultrasonic detection method applied to a pressure pipe, which is used for improving detection efficiency and accuracy. Meanwhile, a convenient defect quantification method is designed, so that accurate size measurement (quantification) of defects is ensured while defects are detected.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410979379.9A CN119000861A (en) | 2024-07-22 | 2024-07-22 | Ultrasonic detection method for pressure pipe |
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| CN202410979379.9A CN119000861A (en) | 2024-07-22 | 2024-07-22 | Ultrasonic detection method for pressure pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119901823A (en) * | 2025-04-02 | 2025-04-29 | 天津铁发科技发展有限公司 | A three-dimensional flaw detection method and device |
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- 2024-07-22 CN CN202410979379.9A patent/CN119000861A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119901823A (en) * | 2025-04-02 | 2025-04-29 | 天津铁发科技发展有限公司 | A three-dimensional flaw detection method and device |
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