JP2011209100A - Phased array ultrasonic flaw detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phased array ultrasonic flaw detection system for reducing the number of focuses, and a data processing time.SOLUTION: A phased array ultrasonic flaw detection method using a sensor comprising a plurality of juxtaposed ultrasonic elements has: the shape measuring step of transmitting and receiving ultrasonic waves to/from a to-be inspected object by using the sensor, and for detecting a shape of the to-be-inspected object; the ultrasonic flaw detection area determining step of determining an ultrasonic flaw detection area from information on the vulnerability of the to-be inspected object and information on the shape by the shape measuring step; and the ultrasonic flaw detecting step of implementing a phased array ultrasonic flaw detection in the ultrasonic flaw detection area within the to-be-inspected object defined by the ultrasonic flaw detection area determining step by using the sensor.

Description

  The present invention relates to a phased array ultrasonic flaw detection method, and more particularly to a flaw detection method capable of maintaining high accuracy while reducing flaw detection and data processing time.

  Phased array ultrasonic flaw detection uses a sensor 1 (hereinafter referred to as an array sensor) composed of a plurality of ultrasonic elements 31 arranged in parallel as shown in FIG. This is an ultrasonic flaw detection method in which the ultrasonic wave is transmitted by adjusting the transmission start time difference so that the ultrasonic wave reaches, and the flaw is detected by increasing the sound pressure at the focal position. According to this method, it is possible to perform a flaw detection over a wide range by scanning the focal position.

  In this flaw detection method, as shown in FIG. 13, when the array sensor 1 is installed, the assumed installation position and installation angle (dotted line) are also required when the error occurs as shown by the solid line during actual installation. In actual flaw detection, as shown in FIG. 14, a range wider than the necessary inspection range is scanned for flaw detection. In other words, when the sensor 1 irradiates the inspection object 2 with ultrasonic waves, the range A should be scanned, but a wider range B is scanned in consideration of the installation position error. For this reason, there is a problem that the number of data acquisition points increases and the processing time increases.

  Further, as shown in FIG. 15, when the installation position of the array sensor 1 is shifted from the dotted line to the solid line, the focus should be focused on the range A, but the focus is shifted to C, so that the flaw detection accuracy is lowered. There is a problem.

  Among these problems, a technique is known in which the shape of the measurement site is measured by the first flaw detection and the focal length is adjusted in accordance with the shape, as in Non-Patent Document 1, in order to cope with the focus shift. ing.

  Further, as in Patent Document 1, there is known a patent relating to adjustment of a focal length in which a flaw detection result is focused on a distance having a high reflection intensity and re-detected.

JP-A-8-75718

Mitsubishi Heavy Industries Technical Report Vol. 44No. 1 (2007)

  In the above-mentioned patent documents or non-patent documents, it is known that flaw detection is performed in two steps for the purpose of adjusting the focal length described with reference to FIGS.

  However, in these patent documents or non-patent documents, the problem of an increase in data processing time caused by an increase in the number of focal points due to flaw detection over a wider range than the necessary range is not studied. When flaw detection is performed over a wide area, as described in FIG. 12, flaw detection is performed toward a specific focal point, and then a specific focal point position is scanned. As the number of focal points in this case increases, the time required for flaw detection, And the problem that the data processing time after that increases is not examined.

  It is an object of the present invention to provide a phased array ultrasonic flaw detection method capable of maintaining high accuracy while reducing the number of focal points in order to reduce flaw detection and data processing time in phased array ultrasonic flaw detection.

  In the phased array ultrasonic flaw detection method of the present invention using an array sensor, a shape measuring step for detecting the shape of the inspection target by transmitting and receiving ultrasonic waves to the inspection target using the array sensor, and information and shape regarding the vulnerability of the inspection target From the shape information acquired in the measurement step, the array sensor is directed toward the ultrasonic flaw detection area determination step that determines the ultrasonic flaw detection area and the ultrasonic flaw detection area in the inspection target that is determined in the ultrasonic flaw detection area determination step. And having an ultrasonic flaw detection step for performing phased array ultrasonic flaw detection.

  Moreover, it is good for the information regarding the vulnerability of a test object to be the stress in a test object.

  Moreover, a stress detection means is attached to the inspection object, and it is preferable to obtain the stress of each part of the inspection object from the stress detection means before the execution of the ultrasonic flaw detection region determination step.

  Further, the information related to the vulnerability of the inspection target is preferably data of damage examples of the inspection target.

  Further, the information on the vulnerability of the inspection target may be data of the analysis result of the strength of the inspection target and the stress in service.

  Further, the flaw detection in the shape measurement step is a rough flaw detection in which a wide range is performed at a rough scanning interval, and the flaw detection in the ultrasonic flaw detection region determination step is preferably a precise flaw detection in which the ultrasonic flaw detection region is flawed at a fine scanning interval.

  Also, in order to determine the ultrasonic transmission start time difference between the ultrasonic elements constituting the array sensor, the ultrasonic transmission start time difference corresponding to the ultrasonic transmission angle and propagation distance calculated before the start of flaw detection is stored as a database. It is preferable to make the determination in accordance with the transmission angle and propagation distance of the ultrasonic wave with respect to the ultrasonic flaw detection region determined in the ultrasonic flaw detection region determination step.

  In the phased array ultrasonic flaw detection method of the present invention using an array sensor, a stress measurement step for measuring the stress of the inspection object, a shape measurement step for detecting the shape of the inspection object by transmitting and receiving ultrasonic waves using the sensor for the inspection object, and Compare the stress measurement result in the stress measurement step with the strength of the inspection object calculated based on the shape measurement result obtained in the shape measurement step, and determine the range where the stress exceeds the strength as the ultrasonic flaw detection position There is an ultrasonic flaw detection step for performing phased array ultrasonic flaw detection using an array sensor toward the ultrasonic flaw detection region in the inspection object determined in the ultrasonic flaw detection region determination step and the ultrasonic flaw detection region determination step.

  In the phased array ultrasonic flaw detection method of the present invention using an array sensor, a database of damage cases or stress analysis results of an inspection object is held, and the shape of the inspection object is detected by transmitting and receiving ultrasonic waves to the inspection object using the sensor. Ultrasonic flaw detection area that determines the part where there is a damage example or the part where the stress exceeds the strength from the shape measurement step to be performed, the damage example or stress analysis result of the database, and the shape measurement result by the shape measurement step And an ultrasonic flaw detection step of performing phased array ultrasonic flaw detection using an array sensor toward the ultrasonic flaw detection region within the inspection object determined in the ultrasonic flaw detection region determination step.

  According to the present invention, since the precision flaw detection range can be limited to a necessary range by shape measurement, the number of focal points is reduced and the data processing time can be shortened.

The figure which shows the flowchart of the phased array ultrasonic flaw detection implementation procedure. 1 is a configuration diagram of an ultrasonic flaw detection system. The block diagram of the array sensor used by ultrasonic flaw detection. The figure which shows the method of performing a phased array ultrasonic flaw detection. The figure which shows the example of distribution of the ultrasonic oscillation start time difference dt [s] with respect to an element position. The figure which shows the specific apparatus structure of an ultrasonic flaw detection system. The figure which shows the relationship between the required scanning range at the time of scanning range likelihood +/- 5 degree, and a focus number. The figure which shows the relationship between the required scanning range at the time of scanning range likelihood +/- 10 degree, and a focus number. The figure which shows the difference between a shape measurement step and an ultrasonic flaw detection step. The block diagram of the ultrasonic flaw detection system in 2nd Embodiment. The figure which shows the specific apparatus structure of the ultrasonic flaw detection system in 2nd Embodiment. The figure which shows the flowchart in 2nd Embodiment. The figure which shows the concept of a phased array ultrasonic flaw detection method. The figure which shows the concept showing the error accompanying a sensor installation position. The figure which shows the present countermeasure for respond | corresponding to the error of a sensor installation position. The conceptual diagram which shows that a focus shifts | deviates by a sensor installation position error.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 is a configuration diagram of an ultrasonic flaw detection system that can be employed in the present invention. The ultrasonic flaw detection system according to the present embodiment includes an array sensor 1, a phased array ultrasonic flaw detector (hereinafter referred to as an ultrasonic flaw detector) 8, a personal computer 9 for data processing and ultrasonic flaw detection condition determination, and a stress measuring device 10. Composed. As the stress measurement device 10, a strain gauge, an X-ray diffraction device, a photoelastic stress measurement device, an infrared stress measurement device, a neutron diffraction device, or the like can be used.

  Among these, as shown in FIG. 3, the array sensor 1 includes rectangular parallelepiped ultrasonic elements 31 arranged in two directions and housed in a protective case 34. Each of the ultrasonic elements 31 constituting the array sensor 1 includes an electrode 32 provided on the bottom surface facing the inspection object and a signal line for applying a voltage to the electrode 32B provided on the upper surface of each ultrasonic element 31 (see FIG. And a damper 33 provided on the electrode 32B for absorbing the energy of the oscillated ultrasonic wave. Since the damper 33 reduces the after vibration during ultrasonic oscillation, the S / N ratio can be improved.

Moreover, as a material of the ultrasonic element 31, a piezoelectric element such as PZT (piezoelectric ceramic: (Pb (Zr, Ti) O ₃ )), LiNbO ₃ , PVDF (polymer piezoelectric element: Polyvinylidene Fluoride) can be used. The electrodes 32 and 32B are made of a highly conductive metal such as Au, Ag, or Cu, a copper wire as the signal line, and a heavy metal such as Hf, W, or Ta mixed in the resin as the damper 34. Is preferably used. The protective case 34 is preferably molded and used from one or more materials of resin and metal.

  FIG. 4 is a diagram illustrating a method of performing ultrasonic flaw detection using the array sensor 1. As shown in this figure, when ultrasonic flaw detection is performed, the ultrasonic waves in each ultrasonic element 31 are simultaneously transmitted from a plurality of ultrasonic elements 31 arranged in parallel in the array sensor 1 to the focal point 36. Adjust the oscillation start time.

  Here, the maximum distance between the ultrasonic element 31 and the focal point 36 is max (L) [m], the distance between the i-th ultrasonic element 31 and the focal point 36 from the left in the figure is Li [m], and the propagation of ultrasonic waves. The velocity (sound velocity) is V [m / s], the X coordinate of the i th ultrasonic element 31 is xi [m], the Y coordinate of the i th ultrasonic element 31 is y i [m], and the X coordinate of the focal point 36 is Let xf [m] and the Y coordinate of the focal point 36 be yf [m].

  At this time, the distance Li [m] between the i-th ultrasonic element 31 and the focal point 36 and the ultrasonic oscillation start time difference dt [s] of each ultrasonic element 31 (hereinafter, the ultrasonic oscillation start time difference is referred to as a delay time). ) Is expressed by the following equations (1) and (2).

図５は、横軸に複数で構成されるアレイセンサ１の各素子の位置をとり、縦軸に遅延時間ｄｔ［ｓ］を示した図である。この図の例では、８個の素子から構成される素子列を、３列設置した例であり、２列目、５番の位置の素子に最も近い位置に焦点を置くときの時間差を表している。

FIG. 5 is a diagram in which the horizontal axis indicates the position of each element of the array sensor 1 configured by a plurality, and the vertical axis indicates the delay time dt [s]. In the example of this figure, three element rows composed of eight elements are installed, and represents the time difference when focusing on the position closest to the element in the second row and the fifth row. Yes.

Specifically, in this figure, the total number of ultrasonic elements 31 is 24, V = 5780 [m / s], xi = (0.5i−0.25) × 10 ⁻³ [mm], yi = 0. The delay time dt [s] when [m], xf = 0 [m], and yf = 3 × 10 ⁻² [m] is shown.

  As shown in this figure, when an ultrasonic element far from the focal point is oscillated early, the arrival time of the ultrasonic wave from each element to the focal point is aligned, so that the signal intensity can be increased.

  FIG. 6 shows a specific device configuration of the ultrasonic flaw detector 8 and the personal computer 9 shown in FIG. In the present invention, ultrasonic flaw detection is executed using the ultrasonic flaw detection system according to the flowchart of the phased array ultrasonic flaw detection method shown in FIG.

  First, an outline of the flowchart will be described. This step is roughly divided into four steps: a stress measurement step S101, a shape measurement step S102, an ultrasonic flaw detection region determination step S103, and an ultrasonic flaw detection step S104. Among these, the stress measurement step S101 and the shape measurement step S102 are used to determine the flaw detection area in the ultrasonic flaw detection area determination step S103. Therefore, this step can be omitted when stress or shape data necessary for determining the flaw detection area is prepared and held in advance. Moreover, although stress and a shape are used when determining a flaw detection area | region, since the execution order may be arbitrary, the order of stress measurement step S101 and shape measurement step S102 can be switched.

  Hereinafter, a procedure for sequentially executing all the steps of the flowchart of FIG. 1 using the apparatus of FIG. 6 will be described.

  First, the stress measurement step S101 will be described.

  First, in step S101a, a stress measurement start signal is input from the keyboard 26 of the personal computer 9 using the apparatus of FIG. The stress measurement start signal is transmitted to the CPU 21 via the I / O port 25 of the personal computer 9.

  In step S101b, the CPU 21 recognizes the stress measurement start signal, transmits this stress measurement start signal to the stress measurement device 10 via the I / O port 25 of the personal computer 9, and operates the stress measurement device 10 to be inspected. Measure the stress distribution of 2.

  In step S101c, the measurement result is transmitted to the CPU 21 via the I / O port 25 of the personal computer 9, and stored in one or more storage devices of the hard disk drive (HDD) 22 or the random access memory (RAM) 23. The

  In step S102, shape measurement using the ultrasonic flaw detector 8 is performed.

  In step S102a, an ultrasonic signal from the array sensor 1 is received and stored. This step is started by inputting a shape measurement start signal from the keyboard 26 of the personal computer 9. This shape measurement start signal is transmitted to the ultrasonic flaw detector 8 via the CPU 21 and the I / O port 25 of the personal computer 9. In the ultrasonic flaw detector 8, a voltage is applied to the array sensor 1 via the D / A converter 30 to scan the ultrasonic waves as shown in FIG. As a result, the reflected wave generated in the inspection object is received by the array sensor 1 and transmitted to the CPU 21 via the A / D converter 29, the I / O port of the ultrasonic flaw detector 8 and the I / O port 25 of the personal computer 9. Then, the data is stored in one or more storage devices of the HDD 22 and the RAM 23. In step S102a, the above-described reception and storage of the ultrasonic signal are executed.

  In step S102b, the CPU 21 reconstructs the position of the reflection source as a figure from the generation direction and generation distance of the reflected wave thus obtained.

  In step S102c, the resulting shape is displayed on the monitor 28 via the I / O port 25 of the personal computer 9.

  The ultrasonic wave transmission conditions in the shape measurement will be described in the effect of the present invention described later. Further, the execution order of the stress measurement step and the shape measurement step may be exchanged.

  In step S103, an ultrasonic flaw detection area is determined.

  First, in step S103a, the CPU 21 analyzes the strength of the inspection target from the shape of the inspection target acquired in step S102 using the strength analysis program stored in the read-only memory (ROM) 24, and obtains a stress value that is not damaged.

  Next, in step S103b, the strength calculation result and the stress value measured in step S101 are compared by the CPU 21, and the region where the stress measurement value exceeds the calculated value of the damage strength is determined as the ultrasonic flaw detection region.

  Finally, in step S104, ultrasonic flaw detection is performed on the position determined based on the above result.

  First, in step S104a, the CPU 21 calculates the delay time of each element 31 from the incident angle and propagation distance of the ultrasonic wave to the ultrasonic flaw detection area determined in step S103.

  In step S104b, a voltage is applied to the array sensor 1 via the I / O port 25 of the personal computer 9, the I / O port 25 of the ultrasonic flaw detector 8 and the D / A converter 30, and each element is applied to each element. Ultrasound is transmitted based on the delay time. The reflected wave generated in the inspection object is received by the array sensor 1 and transmitted to the CPU 21 via the A / D converter 29, the I / O port 25 of the ultrasonic flaw detector 8 and the I / O port 25 of the personal computer 9. Then, the data is stored in one or more storage devices of the HDD 22 and the RAM 23.

  Finally, in step S104c, the CPU 21 evaluates the position of the reflection source in the inspection object from the generation direction and generation angle of the reflected wave, and displays it on the monitor 28 via the I / O port 25 of the personal computer 9.

  Although the procedure shown in the flowchart of FIG. 1 has been described above, ultrasonic flaw detection is performed here in the shape measurement step S102 and the ultrasonic flaw detection step S104. Of these, the flaw detection in the shape measurement step S102 is a rough flaw detection whose main purpose is to measure the shape of a wide range of objects to be inspected, whereas the flaw detection in the ultrasonic flaw detection step S104 is a precise flaw detection of a portion requiring inspection. .

  In the state of flaw detection in the shape measurement step S102 on the left side of FIG. 8, since the position of the inspection required part 100 is unknown, a wide range of shapes including the inspection required part 100 are measured by rough flaw detection. In the flaw detection in the ultrasonic flaw detection step S104 shown on the right side of FIG. 8, the flaw detection is performed on the ultrasonic flaw detection region where the position of the inspection-required portion 100 is specified. Incidentally, in the conventional technique, the position of the inspection required part 100 is not specified, that is, the rough flaw detection range on the left side is precisely flaw-detected.

  Further, the ultrasonic flaw detection region is determined in step S103 of the present invention, which specifies a strong fragile region in the inspection object 2. In the embodiment shown in FIG. 1 as a method for specifying a strong fragile site, the strength calculation result is compared with the stress value measured in step S101, and an area where the stress measurement value exceeds the calculated value of the failure strength is determined. It is determined as a strong fragile site.

  In the present invention, the flaw detection area is determined as described above, and the flaw detection is executed. The focus number reduction effect of the present invention will be described using the dependency of the required focus number on the scanning angle in FIG.

First, the focal number D of the conventional method is
(Scanning angle E for flaw detection of required inspection site + Scanning angle likelihood F for sensor installation position error tolerance) ÷ (Scanning angle interval G for flaw detection)
As required.

On the other hand, the focal number D in this embodiment is
(Scanning angle E for flaw detection of required inspection site + Scanning angle likelihood F for allowing sensor installation position error) ÷ (Scanning angle interval H for shape measurement) + (Necessary scanning angle I) ÷ (Flaw detection Scanning angle interval G)
As required.

  A scanning angle interval G for general flaw detection is 0.5 °, and a scanning angle interval H for shape measurement is 5 °. Further, the scanning angle E for detecting a necessary inspection site used for general flaw detection is 5 to 50 °, and the likelihood F of the scanning angle for allowing the sensor installation position error is ± 5 to 10 °. . The number of focal points of the conventional method and the present invention at this scanning angle interval is as shown in FIG. FIG. 7A shows the case where the likelihood F of the scanning angle for allowing the sensor installation position error is ± 5 °, and FIG. 7B shows the case where the likelihood F of the scanning angle for allowing the sensor installation position error is ± 10 °. It represents the scan angle dependence of the number of focal points for flaw detection at the inspection site. In the figure, the solid line indicates the number of focal points of the present invention, and the broken line indicates the number of focal points of the conventional method. Since the processing time of ultrasonic flaw detection data is proportional to the number of focal points, the data processing time is shortened as the number of focal points decreases.

  Since the present invention is configured as described above, the likelihood of the precision ultrasonic flaw detection range for allowing an error in the sensor installation position is no longer necessary, so the number of focal points is reduced and data processing is accelerated. Is done.

  Next, a second embodiment of the present invention will be described with reference to the drawings. The configuration diagram of the ultrasonic flaw detection system used here is configured as shown in FIG. 9 instead of FIG. 2, and the specific device configuration of the ultrasonic flaw detection system is configured as shown in FIG. 10 instead of FIG. Furthermore, the flowchart of the phased array ultrasonic flaw detection execution procedure is configured as shown in FIG. 11 instead of FIG.

  First, the ultrasonic flaw detection system shown in FIG. 9 and FIG. 10 and its specific apparatus configuration are different from those in FIG. 2 and FIG. One or more databases (hereinafter referred to as DB) 7 among the databases of the analysis results of the strength of the object and the stress in service are provided.

  As a result, the stress measurement step S101 does not exist in the flowchart of FIG. 11, and the process starts from the shape measurement step of step S201. An outline of this flowchart will be described. This step is roughly divided into three steps: a shape measurement step S201, an ultrasonic flaw detection region determination step S202, and an ultrasonic flaw detection step S203.

  A phased array ultrasonic flaw detection method for reducing the number of focal points will be described using the specific apparatus configuration of FIG. 10 and the flowchart of FIG. In this case, it starts from the shape measurement step S201.

  The first step S201a starts when a measurement start signal is input from the keyboard 26 of FIG. 10 and transmitted to the CPU 21 via the I / O port 25 of the personal computer 9, and the CPU 21 recognizes this and starts shape measurement. . Along with the input of the shape measurement start signal, a voltage is applied to the array sensor 1 via the CPU 21, the I / O port 25 of the personal computer, the I / O port 25 of the ultrasonic flaw detector 8, and the D / A converter 30 to generate ultrasonic waves. Send. As a result, the reflected wave generated in the inspection object 2 is received by the array sensor 1, and the CPU 21 passes through the A / D converter 29, the I / O port 25 of the ultrasonic flaw detector 8 and the I / O port 25 of the personal computer 9. And stored in one or more storage devices of the HDD 22 and the RAM 23.

  In step S201b, the CPU 21 reconstructs the position of the reflection source as a figure from the generation direction and generation distance of the reflected wave thus obtained.

  In step S201c, the shape measurement accuracy is improved by comparing the shape measurement result with digital information (CAD information) of the shape to be inspected input from the recording medium 27 such as a DVD or a Blu-ray disc.

  Since the wavelength of the ultrasonic wave used for ultrasonic flaw detection is about 0.2 to 2 mm, the shape measurement accuracy beyond this wavelength cannot be obtained. Therefore, the shape measurement accuracy is improved by correcting the contour of the shape to be inspected so that the difference between the shape information obtained by using the ultrasonic flaw detector in the CPU 21 and the CAD information is minimized. .

  In step S201d, the result of shape matching is stored in one or more storage devices of the HDD 22 and RAM 23 and displayed on the monitor 28 via the I / O port 25 of the personal computer 9. The shape measurement accuracy improving method using the CAD information may be used in the embodiment of FIG.

  Next, in step S202, an ultrasonic flaw detection area is determined.

  Here, first, in step S202a, the CPU 21 collates the inspection object shape measured in step S201 with the damage occurrence location or stress location in the inspection object stored in the DB 7, and the damage occurrence location or stress exceeds the strength. The location is determined as an ultrasonic flaw detection area.

  In step S202b, the precise flaw detection location is displayed on the monitor through the I / O port of the personal computer together with the shape to be inspected measured in step 201.

  Finally, in step S203, ultrasonic flaw detection is executed.

  In the first step S203a, the delay time for precision flaw detection is calculated using the delay time corresponding to the transmission angle and propagation distance of the ultrasonic wave calculated by the CPU 21 and stored in the HDD 22 before the flaw detection start, and in step S202. The CPU 21 determines the transmission angle and propagation distance of the ultrasonic wave in the determined ultrasonic flaw detection area.

  The delay time may be calculated after step S202 based on the transmission angle and propagation distance of the ultrasonic wave as in the first embodiment. Further, in the first embodiment, the delay time of ultrasonic flaw detection may be determined using a delay time calculated in advance as a database in the same manner as in the second embodiment.

  In step S203b, a voltage is applied to the array sensor 1 via the I / O port 25 of the personal computer 9, the I / O port 25 of the ultrasonic flaw detector 8, and the D / A converter 30 based on the delay time thus determined. And send ultrasonic waves. Next, the reflected wave generated in the inspection object 2 is received by the array sensor 1 and sent to the CPU 21 via the A / D converter 29, the I / O port 25 of the ultrasonic flaw detector 8, and the I / O port 25 of the personal computer 9. Is transmitted and stored in one or more storage devices of the HDD 22 and the RAM 23.

  In step S203c, the CPU 21 specifies the position of the reflection source in the inspection object based on the generation direction and generation angle of the reflected wave, and displays it on the monitor 28 via the I / O port 25 of the personal computer 9.

  Although the procedure shown in the flowchart of FIG. 11 has been described above, ultrasonic flaw detection is performed in the shape measurement step S201 and the ultrasonic flaw detection step S203. Among these, the flaw detection in the shape measurement step S201 is a rough flaw detection for measuring the shape of the inspection object, and the flaw detection in the ultrasonic flaw detection step S203 is a precision flaw detection with a limited flaw detection area.

  The relationship between the rough flaw detection and the precision flaw detection described above with reference to FIG. 8 also applies to the flowchart of FIG. It can be considered that the left side of FIG. 8 shows the state of flaw detection in the shape measurement step S201, and the right side of FIG. 8 shows the state of flaw detection in the ultrasonic flaw detection step S203.

  Further, the ultrasonic flaw detection area is determined in step S202 of the present invention, and this also specifies a strong fragile region in the inspection object 2. In the embodiment shown in FIG. 11 as a method for specifying a strong fragile site, a strong fragile site is determined using a database of past damage cases and stress analysis results. That is, in the embodiment of FIG. 10, attention is paid to past damage cases, stress analysis results, and the like as information on the vulnerability of the inspection target.

  Since the present invention is configured as described above, the likelihood of the ultrasonic scanning range for allowing an error in the sensor installation position is no longer necessary, so that the number of focal points is reduced as shown in FIG. Processing is speeded up. Further, since the shape measurement accuracy is improved by collating the shape measurement result by the phased array ultrasonic flaw detection with the CAD information, the reliability of the flaw detection is improved. In addition, since the stress analysis and the delay time analysis are not performed, the total inspection time is further shortened.

  The phased array ultrasonic inspection method in the present invention can detect a wide range at high speed, so that not only conventional inspection objects but also inspection objects are limited in inspection time due to radiation, high temperature, etc. Can be applied.

1: Phased array ultrasonic flaw detection sensor (array sensor)
2: Inspection target 7: Database (DB)
8: Phased array ultrasonic flaw detector (ultrasonic flaw detector)
9: PC 10: Stress distribution measuring device 21: CPU
22: Hard disk drive (HDD)
23: Random access memory (RAM)
24: Read-only memory (ROM)
25: I / O port 26: keyboard 27: recording medium 28: monitor 29: A / D converter 30: D / A converter 31: ultrasonic element 32, 32B: electrode 33: damper 34: protective case 36: focus 100: Inspection required part S101: Stress measurement step S101a: Stress measurement start signal input step S101b: Stress measurement step S101c: Stress measurement result recording step S102: Shape measurement step S102a: Ultrasonic wave transmission / reception step S102b: Shape evaluation step S102c: Shape measurement result display Step S103: Ultrasonic flaw detection area determination step S103a: Inspection object intensity analysis step S103b: Ultrasonic flaw detection area determination step S104: Ultrasonic flaw detection step S104a: Delay time analysis step S104b: Ultrasonic flaw detection step S104c: Detection Result processing / display step S201: Shape measurement step S201a: Ultrasonic transmission / reception step S201b: Shape evaluation step S201c: Shape measurement result-CAD information collation step S201d: Shape measurement result display step S202: Ultrasonic flaw detection area determination step S202a: Damage example Alternatively, the stress analysis result and the inspection target shape collation step S202b: ultrasonic flaw detection area display step S203: ultrasonic flaw detection step S203a: delay time determination step S203b: ultrasonic flaw detection step S203c: flaw detection result processing / display step

Claims (9)

In a phased array ultrasonic flaw detection method using a sensor composed of a plurality of ultrasonic elements arranged in parallel,
From the shape measurement step for detecting the shape of the inspection target by transmitting and receiving ultrasonic waves to the inspection target, the information on the vulnerability of the inspection target and the shape information by the shape measurement step, an ultrasonic flaw detection region An ultrasonic flaw detection area determining step, and an ultrasonic flaw detection that performs phased array ultrasonic flaw detection using the sensor toward the ultrasonic flaw detection area in the inspection object determined in the ultrasonic flaw detection area determination step A phased array ultrasonic flaw detection method comprising steps. In the phased array ultrasonic flaw detection method according to item 1,
The phased array ultrasonic flaw detection method characterized in that the information on the vulnerability of the inspection object is a stress in the inspection object. In the phased array ultrasonic flaw detection method according to item 2,
A phased array ultrasonic flaw detection method, characterized in that a stress detection means is attached to the inspection object, and the stress of each part of the inspection object is obtained from the stress detection means before execution of the ultrasonic flaw detection region determination step. . In the phased array ultrasonic flaw detection method according to item 1,
The phased array ultrasonic flaw detection method characterized in that the information related to the vulnerability of the inspection target is data of damage cases of the inspection target. In the phased array ultrasonic flaw detection method according to item 1,
The phased array ultrasonic flaw detection method characterized in that the information on the vulnerability of the inspection target is data of the analysis result of the strength of the inspection target and the stress in service. In the phased array ultrasonic flaw detection method according to item 1,
A phased array ultrasonic inspection is characterized in that the flaw detection in the shape measurement step is a rough flaw detection directed toward a wide range of the inspection object, and the flaw detection in the ultrasonic flaw detection region determination step is a precise flaw detection toward the ultrasonic flaw detection region. Sonic flaw detection method. In the phased array ultrasonic flaw detection method according to item 1,
To determine the ultrasonic transmission start time difference between the ultrasonic elements constituting the phased array ultrasonic sensor, the ultrasonic transmission start time difference according to the ultrasonic transmission angle and propagation distance calculated before the start of flaw detection is used as a database. An ultrasonic flaw detection method characterized in that the ultrasonic flaw detection method is determined in correspondence with the transmission angle and propagation distance of ultrasonic waves with respect to the ultrasonic flaw detection area determined in the ultrasonic flaw detection area determination step. In a phased array ultrasonic flaw detection method using a sensor composed of a plurality of ultrasonic elements arranged in parallel,
A stress measurement step for measuring the stress of the inspection object, a shape measurement step for detecting the shape of the inspection object by transmitting and receiving ultrasonic waves to the inspection object, and a stress measurement result in the stress measurement step; An ultrasonic flaw detection area determination step that compares the intensities of the inspection object calculated based on the shape measurement result in the shape measurement step and determines an ultrasonic flaw detection position as a range where the stress exceeds the intensity, and the ultrasonic flaw detection area determination A phased array ultrasonic flaw detection method, comprising: an ultrasonic flaw detection step of performing phased array ultrasonic flaw detection using the sensor toward an ultrasonic flaw detection region within the inspection target determined in step. In a phased array ultrasonic flaw detection method using a sensor composed of a plurality of ultrasonic elements arranged in parallel,
A database of a damage example or stress analysis result to be inspected, a shape measurement step for detecting the shape of the inspection target by transmitting and receiving ultrasonic waves to the inspection target using the sensor, and a damage example or stress analysis of the database From the result and the shape measurement result of the shape measurement step, an ultrasonic flaw detection region determination step for determining a portion where there is a damage example or a portion where the stress exceeds the strength as an ultrasonic flaw detection position, and the ultrasonic flaw detection region determination step A phased array ultrasonic flaw detection method comprising: an ultrasonic flaw detection step of performing phased array ultrasonic flaw detection using the sensor toward a predetermined ultrasonic flaw detection region within the inspection target.

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