JP2005148009A - Ultrasonic flaw detector, ultrasonic flaw detection method, and method for generating database for ultrasonic flaw detection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic flaw detector and an ultrasonic flaw detection method capable of performing a precise ultrasonic flaw detection even in a weld part of stainless steel. <P>SOLUTION: An ultrasonic beam B is emitted toward an artificial defect 200 formed in a position corresponding to a point of inspection object 300 in advance, and a driving electric signal S3 in which a difference in delay time is set based on the reflected wave R is prepared. In an actual inspection, the ultrasonic beam B is emitted from a probe 12 by the driving electric signal S3, whereby the point of inspection object 300 is surely exposed to the ultrasonic beam B to perform its ultrasonic flaw detection. At this time, the artificial defect 200 is set to a size capable of surely reflecting the ultrasonic beam B, so that even if an inspection object 100 is the weld part 101 of stainless steel by which the ultrasonic beam B is apt to be scattered or deflected, the reflected wave can be surely caught to generate the driving electric signal S3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ultrasonic flaw detection apparatus, an ultrasonic flaw detection method, and the like suitable for use in ultrasonic flaw detection, particularly ultrasonic flaw detection performed on stainless steel welds and the like.

In recent years, an ultrasonic flaw detection method has been used in order to inspect a defect such as an internal crack in a non-destructive manner for a welded portion of a metal or the like.
As such an ultrasonic flaw detection method, there is a phased array method. This is because, as shown in FIG. 8A, the waves emitted from the individual vibrators 1 are synthesized by independently controlling the plurality of vibrators 1 and shifting the timing of vibrating the individual vibrators 1. In this method, the synthesized wave generated in step (1) is focused and its direction is controlled. By such a method, the synthesized wave of ultrasonic waves is applied to an arbitrary inspection target portion of the inspection object 100 to inspect whether or not a defect such as a crack has occurred (see, for example, Patent Document 1 and Patent Document 2). .)

  However, even if the ultrasonic waves are focused in this way, the traveling direction of the synthetic wave is bent due to the anisotropy of the particles of the inspection object 100, and the reflected wave from the inspection object portion cannot be received, so-called SN ratio. May be in a low state, and defect inspection may not be performed.

  As an effective solution in this regard, an ultrasonic wave is emitted toward the inspection object 100 in advance, the time until the reflected wave returns, and when the inspection is actually performed, the reflected light returned. There is a method of transmitting a signal obtained by inverting a wave to reach a portion to be inspected (see, for example, Patent Document 3).

JP 2001-305115 A JP 2001-343370 A JP-A-6-341978

However, when the inspection object 100 is a stainless steel welded part 101 or a cast body, as shown in FIG. 8B, since the crystal grains are large, before the ultrasonic wave reaches the inspection object location, There is a problem that the inspection cannot be performed because scattering and refraction are caused by reflection at the boundary and the reflected wave itself cannot be obtained.
This is a problem that even the method described in Patent Document 3 in which the reflected wave is observed in advance cannot obtain the reflected wave itself for the same reason as described above, and therefore cannot observe time and cannot be solved.
In addition, the method described in Patent Document 3 is theoretical only and has not been put into practical use for the reason that it is difficult to actually obtain a reflected wave having a sensitivity sufficient to generate an inverted signal.
The present invention has been made based on such a technical problem, and provides an ultrasonic flaw detection apparatus, an ultrasonic flaw detection method, and the like that can perform high-precision ultrasonic flaw detection even in a welded portion of stainless steel or the like. For the purpose.

  For this purpose, the present invention emits an ultrasonic beam to a known artificial defect formed on a test piece, and focuses the ultrasonic beam on a specific position based on a reflected wave or a diffracted wave from the artificial defect. For this purpose, information related to the electrical signal for driving is generated in advance, and an ultrasonic beam is applied to the inspection target portion of the actual inspection object by the driving electrical signal based on this information.

Now, the ultrasonic flaw detection apparatus of the present invention emits an ultrasonic beam with a probe that emits an ultrasonic beam based on an electrical signal and a known artificial defect formed at a specific position in a test piece. An information generation unit that generates information related to the electrical signal for driving for focusing the ultrasonic beam on a specific position in the test piece based on the reflected wave or diffracted wave obtained, and an information storage unit that stores the generated information And a signal transmission unit that transmits an electrical signal for driving to the probe based on the information stored in the information storage unit, and generates an ultrasonic beam that is focused at a specific position in the inspection object from the probe, and an ultrasonic wave A flaw detection analysis unit that performs flaw detection analysis at a specific position based on a reflected wave or a diffracted wave at a specific position of the beam.
In this way, when emitting an ultrasonic beam to a known artificial defect formed on a test piece, the size of the artificial defect is such that the ultrasonic defect reliably reflects or diffracts the ultrasonic beam. It is possible to reliably obtain a wave or a diffracted wave and to generate information on a driving electric signal for focusing an ultrasonic beam at a specific position.

At this time, the number of artificial defects may be one or more. In this case, the information generation unit is configured to drive electric power for focusing the ultrasonic beam at a plurality of specific positions based on a reflected wave or a diffracted wave obtained by emitting the ultrasonic beam to a plurality of known artificial defects. Generate information about the signal.
The probe may include a plurality of transducers and emit an ultrasonic beam when the plurality of transducers vibrate at respective timings based on the driving electrical signal generated by the signal transmission unit. Such a probe may have a plurality of transducers arranged in a line along a predetermined direction, or may be arranged in a matrix of a plurality of rows and a plurality of columns.
Furthermore, the ultrasonic flaw detector can further include a receiving probe that receives a diffracted wave at a specific position of an ultrasonic beam emitted on the probe side. That is, an ultrasonic flaw detector with a TOFD (Time of Flight Diffraction) arrangement can be realized by the probe and the receiving probe. In this case, the information generation unit and the flaw detection analysis unit use the diffracted wave received by the reception probe.

  The present invention is based on a step of emitting an ultrasonic beam with a probe to a known artificial defect formed on a test piece, a step of receiving a reflected wave or a diffracted wave from the artificial defect, and the received reflected wave or diffracted wave A method for generating an ultrasonic flaw detection database, comprising: generating information related to an electrical drive signal for focusing an ultrasonic beam at a specific position and storing the information in a database. .

The ultrasonic flaw detection method of the present invention can use an electric drive signal based on the information generated in this way. That is, the drive electric signal is transmitted to the probe to generate an ultrasonic beam from the probe, focused on a specific position of the inspection object, and a reflected wave or a diffracted wave at the specific position is received. Based on this, flaw detection analysis at a specific position can be performed.
Further, in the step of generating an ultrasonic beam from the probe and focusing it on a specific position of the inspection object, the step of generating the ultrasonic beam from a plurality of different angles and performing flaw detection analysis at a specific position is performed from different angles. It is also possible to obtain flaw detection analysis results based on the reflected waves or diffracted waves of the ultrasonic beam generated a plurality of times, and to superimpose these flaw detection analysis results.

  The present invention can also construct a database by numerical analysis without using a test piece having an artificial defect. That is, the present invention relates to a method for generating an ultrasonic flaw detection database executed by a computer apparatus, the step of creating an analysis model corresponding to an inspection object, and the inspection of the inspection object using the created analysis model A step of calculating the time for the ultrasonic wave to reach from the position corresponding to the target location to the position where the probe for ultrasonic flaw detection is set on the inspection object by numerical analysis, and the ultrasonic wave emitted from the probe based on the calculated time Generating information related to the driving electrical signal for focusing the beam on the inspection target location and storing the information in a database.

  Furthermore, the present invention generates an ultrasonic beam from the probe with respect to the inspection object at a first angle and focuses it on the inspection object portion of the inspection object, and the first reflected wave or diffraction at the inspection object portion of the ultrasonic beam. Receiving the wave, and generating an ultrasonic beam from the probe to the inspection object at a second angle and focusing it on the inspection target portion of the inspection target, and the second reflected wave at the inspection target portion of the ultrasonic beam. Alternatively, a step of receiving a diffracted wave, a step of performing a flaw detection analysis on the inspection target portion for each of the received first and second reflected waves or diffracted waves, and a flaw detection based on the first and second reflected waves or diffracted waves And a step of superimposing the analysis results.

According to the present invention, by providing an artificial defect in the test piece, an electric signal for driving is reliably generated even if the inspection object is a stainless steel welded portion or the like where ultrasonic waves are easily scattered and refracted. be able to.
Further, such a driving electric signal can be generated based on numerical analysis.
When an inspection is actually performed, an ultrasonic beam is emitted by the driving electrical signal, so that the ultrasonic beam can be reliably applied to the inspection target portion, and an accurate ultrasonic flaw detection can be performed.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[First embodiment]
FIG. 1 is a diagram for explaining a configuration of an ultrasonic flaw detector according to the present embodiment.
As shown in FIG. 1, the ultrasonic flaw detector 10 includes a probe 12 including a plurality of transducers 11 and a control unit 20 of the probe 12.
In the present embodiment, the vibrators 11 are arranged in a line along a predetermined direction. Each vibrator 11 is made of a piezoelectric element, and emits a vibration corresponding to an electric signal and an electric signal corresponding to the vibration received from the outside.
The control unit 20 includes a signal transmission unit 21 that transmits an electric signal for vibrating each transducer 11 of the probe 12, a reflected signal reception unit 22 that receives an electric signal corresponding to the vibration detected by the probe 12, An analysis unit (information generation unit, flaw detection analysis unit) 23 that analyzes the received electrical signal, and a database (information storage unit) 24 that stores a delay time of the electrical signal transmitted by the signal transmission unit 21 are provided. Yes.

In such an ultrasonic flaw detector 10, data obtained as follows is stored in the database 24.
That is, as shown in FIG. 2A, before actually performing ultrasonic flaw detection or the like, the reflected wave of the ultrasonic beam is previously applied to the welded portion 101 of the test object 100 for data collection as a test piece. A hole having a size that can be reliably obtained, for example, a few mm, is formed, and this is defined as an artificial defect 200. The artificial defect 200 is formed at a position corresponding to an inspection target location to be actually inspected.
Then, after setting the probe 12 to a predetermined position with respect to the inspection object 100 having such an artificial defect 200, an ultrasonic beam that is a composite wave of ultrasonic waves emitted from each transducer 11 is generated in the artificial defect 200. The electric signal S1 is transmitted from the signal transmission unit 21 so as to be focused at the position.
When each vibrator 11 receives this electric signal S1, the vibrator 11 vibrates at a timing corresponding to the waveform of the electric signal S1, and generates an ultrasonic wave. At this time, an electric signal S1 having a waveform with different timing (delay time) for generating vibration is transmitted from the signal transmission unit 21 to each transducer 11 so that the ultrasonic wave reaches the position of the artificial defect 200. Therefore, an ultrasonic beam directed toward the artificial defect 200 is formed by the ultrasonic wave emitted from each transducer 11.
This ultrasonic beam is reflected by the artificial defect 200 which is much larger than the defect present in the welded portion 101 of the normal inspection object 100, and a reflected wave R is generated.

When the reflected wave R reaches each transducer 11 of the probe 12, each transducer 11 emits an electrical signal S2 corresponding to the reached reflected wave R. The electrical signal S2 is received by the reflected signal receiving unit 22 of the control unit 20.
Based on the received electrical signal S2, the analysis unit 23 inverts (temporarily inverts) the electrical signal S2 of the reflected wave R corresponding to each transducer 11 (hereinafter referred to as a drive electrical signal). S3) is generated. Here, the reflected wave R passes through a path when returning from the artificial defect 200 to each vibrator 11, that is, a path affected by bending due to crystal grains of the welded portion 101. That is, since the electric signal S2 received by each vibrator 11 includes a time difference due to a difference in path, the electric signal S2 is inverted to cause vibration in the driving electric signal S3 for each vibrator 11. The generation timing (delay time) is set.
The generated data of the driving electrical signal S3 for each vibrator 11 (information on the driving electrical signal) includes information on the set delay time of the driving electrical signal S3 and indicates the position of the artificial defect 200. And stored in the database 24.

When actually inspecting the inspection object 100 (not for data collection) with the ultrasonic flaw detector 10 having the above data stored in the database 24, as shown in FIG. Is set at a predetermined position.
Then, based on the data stored in the database 24 in advance, the signal transmission unit 21 transmits the drive electrical signal S3 to each transducer 11 of the probe 12. Then, each transducer 11 of the probe 12 emits an ultrasonic wave at a timing corresponding to the waveform (delay time) of the driving electrical signal S3.

  The vibration generation timing of each transducer 11 set by the drive electrical signal S3 is different, and an ultrasonic beam B is formed as a composite wave of the ultrasonic waves emitted from each transducer 11. At this time, the electric signal S3 for driving is obtained by inverting the electric signal S2 of the reflected wave R passing through the path from the artificial defect 200 to each vibrator 11 under the influence of the bending due to the crystal grains of the welded portion 101 or the like. Therefore, the ultrasonic wave emitted from the transducer 11 propagates in the form of going backward along the path of the reflected wave R, and the ultrasonic beam B, which is the combined wave, is used for data collection in the welded part 101 of the inspection object 100. Are focused on an inspection object location (specific position) 300 at a position corresponding to the artificial defect 200 in the inspection object 100.

The focused ultrasonic beam B is reflected according to the presence / absence of the scratch on the inspection object location 300, the situation, etc., and the reflected wave R is transmitted to each transducer 11 of the probe 12. Each transducer 11 emits an electrical signal corresponding to the reflected wave R that has arrived, and this is received by the reflected signal receiver 22 of the controller 20.
Based on the received electrical signal, the analysis unit 23 analyzes the reflected wave R corresponding to each of the transducers 11 to generate information such as the presence or absence of a scratch, the size of the scratch, and the like. Is output to the outside by appropriate output means.

In this way, the point is that, as in Patent Document 3, the ultrasonic beam B is emitted in advance toward the artificial defect 200, and the drive electric signal S3 in which the difference in delay time is set based on the reflected wave R is obtained. Have it ready. When the inspection is actually performed, the ultrasonic beam B is emitted from the probe 12 with the driving electric signal S3, so that the traveling direction of the ultrasonic beam B is anisotropy of the welded portion 101 of the inspection object 100. Even in the case of being affected, the ultrasonic beam B can be reliably applied to the inspection target portion 300.
In addition, when the ultrasonic beam B is applied to the artificial defect 200 in advance in order to obtain the driving electric signal S3, the ultrasonic beam B is set to a size that the ultrasonic beam B is surely reflected. Even if B is a stainless steel welded part 101 that is easily scattered and refracted, the reflected wave R can be reliably captured and the drive electrical signal S3 can be generated.

FIG. 3 shows an application example of the above embodiment.
In the above embodiment, the example in which the artificial defect 200 is provided at one place is given. However, in the example of FIG. 3A, a plurality of artificial defects 200 are arranged so as to cover the entire welded portion 101, respectively. In the same manner as described above, the ultrasonic beam B is applied in advance to the artificial defect 200, and a drive electrical signal S 3 is generated based on the reflected wave R and stored in the database 24.
Then, as shown in FIG. 3B, when actually inspecting, the generated driving electrical signal S3 is used to superimpose a plurality of inspection object locations 300 corresponding to the plurality of artificial defects 200. Scanning is performed by sequentially applying the sound wave beam B, and flaw detection is performed from the reflected wave R at each inspection object location 300.

  With such a configuration, flaw detection inspection can be performed on almost the entire area of the welded portion 101, and the defect detection performance can be improved.

FIG. 4 shows another application example of the above embodiment.
In the above embodiment, the transducers 11 of the probe 12 are arranged in a line in a straight line. However, in the example of FIG. 4, the transducers 11 of the probe 12 are arranged in a matrix, that is, in an orthogonal direction. N rows are arranged.
Then, the ultrasonic beam B emitted from the m × n rows of transducers 11 is focused at one point, and the ultrasonic beam B is generated by the drive electric signal S3 obtained using the artificial defect 200, as in the above embodiment. And ultrasonic flaw detection can be performed.

  With such a configuration, the focusability (energy concentration level) of the ultrasonic beam B is increased, the SN ratio is improved, and the defect detection performance can be further enhanced.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described.
As shown in FIG. 5, in the present embodiment, two pairs of probes 12 </ b> A and 12 </ b> B are divided into a transmission side and a reception side, and are arranged to face both sides of the welded portion 101. Such an arrangement is called a TOFD arrangement.
Here, with respect to the configuration of the control unit 20, the probe 12 that has also been used for transmission and reception in the first embodiment is simply divided into the probes 12A and 12B on the transmission side and reception side in the present embodiment. Have substantially the same function.

The ultrasonic flaw detector 10 having such a configuration basically has the same configuration as the technique disclosed in Japanese Patent Laid-Open No. 2001-228126. That is, the ultrasonic beam B emitted from the probe 12A on the transmission side is focused on the inspection target portion 300 of the inspection object 100, and the diffracted wave H diffracted there instead of being reflected is received by the probe (reception probe) 12B on the reception side. To do.
As in the first embodiment, a plurality of artificial defects 200 (see FIG. 3A) is provided in advance on the inspection target 100 for data collection, and the artificial defects 200 are provided on the transmission side. The ultrasonic beam B emitted from the probe 12A is focused, the diffracted wave H is received by the probe 12B on the receiving side, the drive electric signal S3 is generated based on this, and the data is stored in the database 24. . When actually inspecting, the generated driving electrical signal S3 is used to focus and apply the ultrasonic beam B to the inspection target location 300 corresponding to the artificial defect 200. The flaw detection is performed from the diffracted wave H.

  Thus, the depth (length) of the defect 400 can be detected from the diffracted waves H at the upper and lower ends of the defect 400 of the welded portion 101 by using the probes 12A and 12B arranged in TOFD. Moreover, at that time, in the same manner as in the first embodiment, when the ultrasonic beam B is emitted toward the inspection target portion 300 in advance, the artificial defect 200 is provided on the inspection target object 100, so that the ultrasonic wave is provided. Even in the case of the stainless steel welded portion 101 where the beam B is easily scattered and refracted, the reflected wave R can be reliably captured and the drive electric signal S3 can be generated.

[Third embodiment]
Next, a third embodiment according to the present invention will be described.
In the third embodiment, the defect 400 is flawed by applying the ultrasonic beam B to a single inspection target location 300 from a plurality of directions with different angles.
For this purpose, in the first embodiment (including the application examples shown in FIGS. 3 and 4), the ultrasonic beam B is applied to the artificial defect 200 in advance from a plurality of directions with different angles. Based on the reflected wave R, an electric drive signal S3 is generated and stored in the database 24.
When the inspection is actually performed, as shown in FIGS. 6A and 6B, the generated driving electrical signal S3 is used, and a plurality of directions (at different angles with respect to the inspection target location 300) ( The ultrasonic beams B1 and B2 are separately applied from the angles θ1 and θ2), and the reflected wave R (first reflected wave and second reflected wave) at the inspection object location 300 is obtained in each direction. At this time, the analysis unit 23 generates a flaw detection analysis result including a position when the defect 400 exists based on the reflected wave R obtained by applying the ultrasonic beam B from each direction. Then, as shown in FIG. 6C, the analysis unit 23 emphasizes information indicating the position of the defect 400 by superimposing a plurality of flaw detection analysis results obtained by applying different ultrasonic beams B. be able to.

In this way, information including the position when the defect 400 is present is generated from the reflected wave R at the inspection object location 300 when the ultrasonic beam B is applied from a plurality of directions with different angles, and these are superimposed. Thus, information indicating the position of the defect 400 can be emphasized, and the signal-to-noise ratio of the signal can be improved.
Also at this time, the ultrasonic beam B is applied to the artificial defect 200 from a plurality of directions at different angles, and the drive electrical signal S3 is generated based on the reflected wave R and stored in the database 24 in advance. Thus, even if the ultrasonic beam B is a stainless steel welded portion 101 that is easily scattered and refracted, the reflected wave R can be reliably captured and the drive electric signal S3 can be generated.

[Fourth embodiment]
Next, a fourth embodiment according to the present invention will be described.
In the first to third embodiments, the ultrasonic beam B is applied to the artificial defect 200 in advance, and the drive electrical signal S3 is generated based on the reflected wave R and stored in the database 24. However, in the fourth embodiment, the ultrasonic beam B is not applied to the artificial defect 200 but is obtained by numerical analysis.
To do this, the computer apparatus is caused to execute a flow process as shown in FIG.
First, as shown in FIG. 7, an analysis model corresponding to the inspection object 100 and including the ultrasonic anisotropy of the welded portion 101 is created (step S101). Here, it is assumed that the analysis model to be created includes information such as the groove shape of the welded portion 101, the material sound velocity, and anisotropy. The mesh of the analysis model corresponds to the analysis method used.
Then, on the analysis model, a point sound source is generated from a point corresponding to the inspection object location 300 of the inspection object 100 by a numerical analysis method such as a finite element method or a difference method (step S102).
On the analysis model, the sound arrival time is calculated at each point corresponding to the position (flaw detection surface) where each transducer 11 of the probe 12 is set on the inspection object 100 (step S103).
After the sound arrival time is obtained by simulation by numerical analysis in this way, the information of the driving signal is calculated back from the sound arrival time in substantially the same manner as in the first to third embodiments. This is set and stored in the database 24 (step S104).

  Thus, after actually storing the driving signal information in the database 24, when actually inspecting, the generated driving electrical signal S3 is used to indicate the inspection object location 300 of the actual inspection object 100. On the other hand, the ultrasonic beam B is applied, and flaw detection is performed from the reflected wave R and the diffracted wave H at each inspection object location 300.

  With such a configuration, it is possible to construct the database 24 by numerical analysis without conducting an experiment using the inspection object 100 for collecting data in advance. As a result, it is possible to shorten the time required for preparation in advance and to easily perform the flaw detection of the inspection object 100 of various forms. The configuration of the present embodiment is very effective even when the inspection object 100 for data collection cannot be prepared.

Note that the configurations shown in the first to fourth embodiments can be appropriately combined.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

It is a figure which shows the structure of the ultrasonic flaw detector in this Embodiment. It is a figure which shows 1st embodiment, (a) is the state which has applied the ultrasonic beam to the artificial defect in order to generate | occur | produce the electrical signal for a drive, (b) is an ultrasonic beam to an actual test object location. It is a figure which shows the state which has applied. It is a figure which shows the example of application of 1st embodiment, (a) is the state which has applied the ultrasonic beam to the artificial defect, (b) is the figure which shows the state which has applied the ultrasonic beam to the location to be inspected It is. It is a figure which shows the other application example of 1st embodiment, and is an example in the case of using the probe which has a matrix-form vibrator. It is a figure which shows 2nd embodiment, and is a figure which shows the state which has irradiated the ultrasonic beam to the actual test object location. It is a figure which shows 3rd embodiment, (a) is the state which is applying the ultrasonic beam from the 1st direction, (b) is the state which is applying the ultrasonic beam from the 2nd direction, (c ) Is a diagram showing a state in which (a) and (b) are overlapped. It is a figure which shows the flow of the process for calculating | requiring the electric signal for a drive by numerical analysis. It is a figure which shows the prior art, (a) is a figure which shows the state in which the ultrasonic beam has been converged by the phased array method, and (b) is a figure in which the ultrasonic beam has been scattered.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Ultrasonic flaw detector, 11 ... Vibrator, 12, 12A ... Probe, 12B ... Probe (reception probe), 20 ... Control part, 21 ... Signal transmission part, 22 ... Reflection signal reception part, 23 ... Analysis part (information) Generation unit, flaw detection analysis unit), 24 ... database (information storage unit), 100 ... inspection object, 101 ... welded part, 200 ... artificial defect, 300 ... inspection target location (specific position), 400 ... defect, B ... Ultrasonic beam, B1 ... ultrasonic beam, B2 ... ultrasonic beam, H ... diffracted wave, R ... reflected wave, S3 ... electric signal for driving, θ1 ... angle (first angle), θ2 ... angle (second angle)

Claims (10)

A probe that emits an ultrasonic beam based on an electrical signal;
Based on a reflected wave or a diffracted wave obtained by emitting an ultrasonic beam with the probe to a known artificial defect formed at a specific position in the test piece, the ultrasonic beam is applied to the specific position in the test piece. An information generator for generating information on the driving electrical signal for focusing;
An information storage unit for storing the generated information;
A signal transmission unit that transmits the driving electrical signal to the probe based on the information stored in the information storage unit, and generates an ultrasonic beam that is focused from the probe at a specific position in the inspection object; ,
A flaw analysis unit for performing flaw analysis at the specific position based on the reflected wave or diffracted wave at the specific position of the ultrasonic beam;
An ultrasonic flaw detector characterized by comprising:   The information generation unit is configured to focus the ultrasonic beam on a plurality of specific positions based on the reflected wave or diffracted wave obtained by emitting the ultrasonic beam to a plurality of known artificial defects. The ultrasonic flaw detector according to claim 1, wherein information related to an electrical signal for operation is generated.   The probe includes a plurality of transducers, and emits an ultrasonic beam when the plurality of transducers vibrate at respective timings based on the driving electrical signal generated by the signal transmission unit. The ultrasonic flaw detector according to claim 2.   The ultrasonic flaw detector according to claim 3, wherein the plurality of transducers of the probe are arranged in a matrix of a plurality of rows and a plurality of columns. A receiving probe for receiving a diffracted wave at the specific position of the ultrasonic beam emitted on the probe side;
The ultrasonic flaw detection apparatus according to claim 1, wherein the information generation unit and the flaw detection analysis unit use the diffracted wave received by the reception probe. Emitting an ultrasonic beam with a probe to a known artificial defect formed on a test piece;
Receiving a reflected wave or a diffracted wave from the artificial defect;
Based on the received reflected wave or diffracted wave, generating information related to the driving electrical signal for focusing the ultrasonic beam at a specific position and storing it in a database;
A method for generating a database for ultrasonic flaw detection, comprising: By sending an electrical signal for driving generated by emitting an ultrasonic beam to a known artificial defect formed on a test piece to the probe, the ultrasonic beam is generated from the probe and the inspection object is specified. Focusing on the position of
Receiving a reflected wave or a diffracted wave at the specific position of the generated ultrasonic beam;
Based on the received reflected wave or diffracted wave, performing a flaw detection analysis of the specific position;
An ultrasonic flaw detection method comprising: In the step of generating an ultrasonic beam from the probe and focusing on a specific position of the inspection object, the ultrasonic beam is generated a plurality of times from different angles,
The flaw detection analysis result based on each of the reflected wave or the diffracted wave of the ultrasonic beam generated a plurality of times from different angles is overlaid in the step of performing the flaw detection analysis at the specific position. The ultrasonic flaw detection method as described. A method for generating an ultrasonic flaw detection database executed by a computer device, comprising:
Creating an analysis model corresponding to the inspection object;
Using the created analysis model, the time required for the ultrasonic wave to reach from the position corresponding to the inspection target position of the inspection object to the position where the probe for ultrasonic flaw detection is set to the inspection object is calculated by numerical analysis. And steps to
Based on the calculated time, generating information on an electrical signal for driving for focusing an ultrasonic beam emitted from the probe on the inspection target location, and storing the information in a database;
A method for generating a database for ultrasonic flaw detection, comprising: An ultrasonic beam is generated from the probe with respect to the inspection target at a first angle and focused on the inspection target portion of the inspection target, and the first reflected wave or diffraction wave of the ultrasonic beam at the inspection target portion is generated. Receiving, and
An ultrasonic beam is generated from the probe with respect to the inspection object at a second angle and focused on the inspection target portion of the inspection target, and the second reflected wave or diffracted wave of the ultrasonic beam at the inspection target portion. Receiving
A step of performing a flaw detection analysis of the inspection target portion for each of the received first and second reflected waves or diffracted waves;
Superimposing flaw detection analysis results based on the first and second reflected waves or diffracted waves;
An ultrasonic flaw detection method comprising:

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