JP6814707B2 - Ultrasonic probe and ultrasonic flaw detector - Google Patents

Description

The present invention relates to an ultrasonic probe (hereinafter, also simply referred to as a “probe”) and an ultrasonic flaw detector.

Conventionally, ultrasonic flaw detection of butt welds has been performed, for example, in periodic inspections of spherical gas holders. Here, according to the spherical gas holder guideline, the pulse reflection method and the TOFD (Time of Flight Diffraction) method are listed as applicable ultrasonic flaw detection methods (see, for example, Non-Patent Document 1).

The pulse reflection method is a method of detecting a scratch by radiating an ultrasonic wave to a welded portion and receiving the ultrasonic wave reflected by the scratch. In this method, in order to detect scratches on the weld without overlooking, X scanning for moving the probe parallel to the weld line and Y scanning for moving the probe perpendicular to the weld line are alternated. Need to repeat.

On the other hand, in the TOFD method, two probes on the transmitting side and the receiving side are used to move these probes parallel to the welding line, and the propagation time of the diffracted wave generated at the edge of the scratch is This is a method of detecting scratches by referring to the difference (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-149888

Japan Gas Association, "Spherical Gas Holder Guideline", JGA Finger 104-13, 2014

However, the pulse reflection method has a problem that it is necessary to repeatedly move the probe in parallel and perpendicular to the welding line, and it takes a long time to detect the flaw.

Further, although the TOFD method can measure the depth of a scratch with high accuracy, there is a problem that a skillful technique is required for determining a flaw detection result and a long time is required for the determination.

Therefore, in order to solve the problems of the conventional ultrasonic flaw detection method, sufficient ultrasonic waves are radiated from the probe to the range where flaw detection is required (hereinafter, also referred to as “fault detection range”) to the welded portion. By performing the pulse reflection method only by X scanning that moves the probe in parallel, the time required for flaw detection is significantly shortened as compared with the conventional ultrasonic flaw detection method (hereinafter, "pulse reflection X scanning method"). Is being considered.

However, until now, there is a problem that it has not been possible to find a probe capable of emitting sufficient ultrasonic waves to a range where flaw detection is required.

Therefore, it is an object of the present invention to provide an ultrasonic probe capable of shortening the time required for flaw detection by radiating sufficient ultrasonic waves to a range where flaw detection is required.

According to the ultrasonic probe of the embodiment of the present invention, the first probe that emits ultrasonic waves to the flaw detection range including the welded portion and receives the ultrasonic waves reflected by the flawed portion of the welded portion. An ultrasonic probe including a portion and a second detection portion, wherein the first detection portion emits ultrasonic waves to a plurality of regions in which the flaw detection range is divided into a plurality of regions in the width direction of the welded portion. In addition, it has a plurality of first transducers that receive ultrasonic waves reflected by the flawed portion, and the second probe portion has the plurality of first vibrations with respect to the welded portion in the width direction. It is arranged at a position farther than the child, and has a second transducer that emits ultrasonic waves over the entire flaw detection range and receives the ultrasonic waves reflected by the flawed portion.

According to the embodiment of the present invention, there is provided an ultrasonic probe capable of shortening the time required for flaw detection by radiating sufficient ultrasonic waves to a range where flaw detection is required.

(A) to (c) are cross-sectional views illustrating the ultrasonic flaw detector according to the embodiment. (A) and (b) are diagrams showing the probe 100 in the embodiment. It is a figure explaining the process of detecting the position of a defect part 21. It is a figure which shows the spread range of the beam of the probe 100 in an embodiment. It is a figure which shows the outline of the confirmation test using the probe 100 in embodiment.

Hereinafter, modes for carrying out the invention will be described with reference to the drawings. In each drawing, the same components may be designated by the same reference numerals and duplicate description may be omitted.

[Embodiment]
FIG. 1 is a cross-sectional view showing an ultrasonic flaw detector 1 according to an embodiment. FIG. 1A shows a state in which ultrasonic waves are not radiated from the probe 100 and the probe 200, and FIG. 1B shows only the oscillators 112, 114, and 116 of the probe 100. The state in which ultrasonic waves are radiated from the probe 200 is indicated by dots, and FIG. 1 (c) shows the state in which ultrasonic waves are radiated only from the probe 200 by hatching.

In FIG. 1, as the XYZ coordinate system, the vertical direction of the paper surface is defined as the X-axis direction, the left-right direction is defined as the Y-axis direction, and the vertical direction is defined as the Z-axis direction. This ultrasonic flaw detection device 1 is a device that performs ultrasonic flaw detection for a flaw detection range 30 including a welded portion 20 that connects steel plates 10 to each other.

FIG. 1 shows a cross section of the steel plate 10 and the welded portion 20. The surface 11 of the steel sheet 10 in the positive direction of the Z axis is, for example, the outer surface of the spherical gas holder, and the surface 12 in the negative direction of the Z axis is the inner surface of the spherical gas holder. Further, the welded portion 20 is a portion welded along the X-axis direction. Here, for convenience, the length of the welded portion 20 is in the X-axis direction, and the width of the welded portion 20 is in the Y-axis direction.

The ultrasonic flaw detector 1 includes a probe 100 which is a first detection unit, a probe 200 which is a second detection unit, and a control unit 300. The probe 100 and the probe 200 each emit ultrasonic waves to the flaw detection range 30, and also receive ultrasonic waves reflected by the defect portion 21 such as a scratch generated on the welded portion 20, respectively, and the control unit 300. Output to. In this embodiment, the flaw detection range 30 is 32 mm. The flaw detection range 30 will be described later.

Specifically, the ultrasonic flaw detector 1 simultaneously radiates ultrasonic waves from the inner surface 13 on the surface 11 side to the steel plate 10 in an oblique direction by the probe 100 and the probe 200, respectively, on the surface 12 side of the steel plate 10. The ultrasonic waves are reflected on the inner surface 14 of the above, and the ultrasonic waves are radiated to the flaw detection range 30. At this time, if the defect portion 21 is present in the welded portion 20, the ultrasonic wave is reflected by the defect portion 21 and further reflected by the inner surface 14, and is received by the probe 100 and the probe 200, respectively. Here, the ultrasonic flaw detector 1 detects a defect portion 21 having a depth of about 4 mm from the surface 11 on a steel plate 10 having a thickness of, for example, 20 mm. The defect portion 21 is a crack or the like generated in the welded portion 20.

Further, the probe 100 and the probe 200 are arranged in contact with the surface 11 of the steel plate 10 when performing ultrasonic flaw detection on the defect portion 21. Further, the probe 200 is arranged at a position farther than the probe 100 with respect to the welded portion 20 in the width direction (Y-axis direction) of the welded portion 20. Here, in the pulse reflection X scanning method described above, the probe 100 and the probe 200 are moved only in the length direction (X-axis direction) of the welded portion 20.

The probe 100 has a plurality of oscillators 111 to 116 and terminals 120. As shown in FIG. 1B, the vibrators 111 to 116 radiate ultrasonic waves to a plurality of regions 111A to 116A in which the flaw detection range 30 is divided into a plurality of regions in the width direction (Y-axis direction) of the welded portion 20. To do. Further, the vibrators 111 to 116 receive the ultrasonic waves reflected by the defect portion 21, and output the ultrasonic waves from the terminals 120 to the control unit 300.

The probe 200 has an oscillator 210 and a terminal 220. The vibrator 210 is arranged at a position farther than the vibrators 111 to 116 with respect to the welded portion 20 in the width direction of the welded portion 20. Further, as shown in FIG. 1C, the vibrator 210 radiates ultrasonic waves over the entire flaw detection range 30 and receives the ultrasonic waves reflected by the defect portion 21, and the intensity of the received ultrasonic waves. Is output from the terminal 220 to the control unit 300. The distance between each of the vibrators 111 to 116 and the vibrator 210 in the Y-axis direction is stored in advance in the internal memory of the control unit 300.

Here, the transducers 111 to 116 and the transducer 210 are a piezoelectric ceramic such as PZT (lead zirconate titanate), a polymer piezoelectric element such as PVDF (polyvinylidene fluoride), or PMN-PT (magnesium niobic acid-). It is a composite transducer in which electrodes are formed at both ends of a thin plate-shaped piezoelectric body composed of a piezoelectric single crystal such as lead titanate) and wrapped with a polymer.

When a drive signal (for example, 5 MHz) is given to these oscillators 111 to 116 and the oscillator 210 from the control unit 300, the thin plate-shaped piezoelectric body expands and contracts in the thickness direction to emit pulsed ultrasonic waves. .. Further, the vibrators 111 to 116 and the vibrator 210 expand and contract by receiving ultrasonic waves to generate an electric signal.

The control unit 300 is realized by, for example, a computer including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), an HDD (Hard Disk Drive), and the like. Various programs executed by the CPU are stored in the ROM or HDD.

The control unit 300 performs ultrasonic flaw detection based on the drive control of the vibrators 111 to 116 and the vibrator 210 (control to output ultrasonic waves), the reception level of ultrasonic waves of the vibrators 111 to 116 and the vibrator 210, and the like. Execute. Ultrasonic flaw detection is a process of detecting the position of the defect portion 21.

A program for giving the computer various functions as the control unit 300 is installed in the computer via a storage medium readable by the computer, or is installed in another computer via a modem or the like connected to a network such as the Internet. It is downloaded from your computer system and installed on your computer.

The control unit 300 outputs drive signals for simultaneously radiating ultrasonic waves to the oscillators 111 to 116 and the oscillator 210 of the probe 100 and the transducer 200, respectively, and the oscillators 111 to 116 and the oscillators 300. Ultrasonic flaw detection is performed based on the electrical signal output from 210.

That is, the transducers 100 and the oscillators 111 to 116 and the oscillators 210 of the probe 200 emit ultrasonic waves into the flaw detection range 30 in response to the pulsed drive signal input from the control unit 300, respectively. The ultrasonic waves reflected by the defect portion 21 are received respectively. Further, the control unit 300 describes the ultrasonic waves received by the vibrators 111 to 116 and the vibrator 210 at the points where the ultrasonic waves radiated from the vibrators 111 to 116 and the ultrasonic waves radiated from the vibrator 210 overlap each other. Perform flaw detection based on.

The control unit 300 is simultaneously radiated from the vibrators 111 to 116 and the vibrator 210, reflected by the defect portion 21, and received by at least one of the vibrators 111 to 116 and the vibrator 210, respectively. When the reception level of the ultrasonic sound exceeds a preset threshold value, it is determined that there is a defect portion 21, and a process of detecting the position of the defect portion 21 is executed. The details of the processing will be described later with reference to FIG.

At this time, depending on the shape of the defective portion 21, the ultrasonic waves radiated from any of the vibrators 111 to 116 and reflected by the defective portion 21 do not return to the vibrators 111 to 116 that radiated the ultrasonic waves, and the other ultrasonic waves are not returned. It may be received by the oscillators 111-116. Even in this case, the position of the defect portion 21 can be specified.

Next, the configuration of the probe 100 will be described with reference to FIG. 2A and 2B are views showing the probe 100 according to the embodiment, FIG. 2A shows a front view, and FIG. 2B shows a right side view. In FIG. 2, the probe 100 is for performing ultrasonic flaw detection by moving together with the probe 200 in the X-axis direction along the welded portion 20.

In FIG. 2, the transducer 100 includes the above-mentioned vibrators 111 to 116, terminals 121 to 126, a housing 130, a holding portion 140, a shielding portion 150, a sound absorbing portion 160, and wirings 171 to 176. Has. The vibrators 111 to 116, the holding portions 140, the shielding portions 151 to 155, the sound absorbing portions 160, and the wirings 171 to 176 are provided inside the housing 130. The terminals 121 to 126 are individual representations of the terminals 120 shown in FIG. 1, and are provided outside the housing 130 and connected to the control unit 300.

The oscillators 111 to 116 are fixed at equal angles with respect to the vertical direction (Z-axis direction) in order to radiate ultrasonic waves to the regions 111A to 116A in which the flaw detection range 30 is divided in the width direction of the welded portion 20, respectively. , Six are arranged along the width direction of the welded portion 20. By arranging the vibrators 111 to 116 along the width direction of the welded portion 20, ultrasonic waves can be radiated at one time over the entire flaw detection range 30.

The holding portion 140 is a member that fixes the vibrators 111 to 116 at the same angle to each other so that ultrasonic waves are radiated to the regions 111A to 116A, and is made of a resin (for example, acrylic) or the like. .. As an example, the holding portion 140 is a resin filled inside the housing 130. The vibrators 111 to 116 are fixed by the holding portion 140, so that the refraction angle, which is the angle at which the ultrasonic waves are incident on the steel sheet 10, is set to a predetermined refraction angle (for example, 50 degrees), and the ultrasonic waves are incident on the steel sheet 10. To do.

The holding portion 140 is in contact with the surface 11 of the steel plate 10. Further, the ultrasonic waves radiated from the vibrators 111 to 116 proceed while spreading after the radiation. By using the holding portion 140, the angle of incidence of ultrasonic waves on the welded portion 20 can be easily adjusted.

The shielding portions 151 to 155 are provided between the oscillators 111 to 116 adjacent to each other, and the ultrasonic waves radiated from any of the oscillators 111 to 116 and the reflected waves reflected by the surface 11 of the steel plate 10 are in phase. The ultrasonic waves are shielded so that they are difficult to be received by the adjacent oscillators 111 to 116. The shielding portions 151 to 155 are made of a material such as rubber, resin, or cork that does not easily reflect ultrasonic waves. By providing the shielding portions 151 to 155, the interference of ultrasonic waves between the oscillators 111 to 116 adjacent to each other is suppressed.

The sound absorbing portion 160 is provided on the Z-axis positive direction side of the vibrator 111, is radiated from the vibrators 111 to 116, is reflected by the defective portion 21, is scattered and returned, and unnecessary ultrasonic waves and the vibrators 111 to 11 It absorbs the ultrasonic waves radiated on the side of 116 opposite to the steel plate 10. The sound absorbing portion 160 is made of rubber, resin, or the like.

The wirings 171 to 176 are metal wirings whose surfaces are protected by a protective film or the like made of an insulator, and electrically connect the vibrators 111 to 116 and the terminals 121 to 126, respectively.

The probe 200 has the same configuration as the probe 100 except that it has one oscillator 210 and does not have a shielding portion. That is, the probe 200 has an oscillator 210, a terminal 220, a housing, a holding portion, a sound absorbing portion, and wiring. The specifications of the probe 100 and the probe 200 are illustrated in Table 1 below. The housing, holding portion, and sound absorbing portion of the probe 200 correspond to the housing 130, holding portion 140, and sound absorbing portion 160 of the probe 100. Further, the wiring of the probe 200 corresponds to one of the wirings 171 to 176 of the probe 100.

From Table 1, in the present embodiment, the frequency of the drive signal given to the oscillators 111 to 116 of the probe 100 is 5 MHz, and the frequency of the drive signal given to the oscillator 210 of the probe 200 is 3 MHz. Further, each of the six oscillators 111 to 116 of the probe 100 has a flat plate shape of 5 mm × 10 mm. Further, one oscillator 210 of the probe 200 has a flat plate shape of 1 mm × 10 mm. Further, the refraction angles of the probe 100 and the probe 200 are set to 50 degrees and 68 degrees, respectively.

Here, the number of oscillators 111 to 116 is determined according to the length in the width direction of the flaw detection range 30 and the length in the width direction in each of the regions 111A to 116A. Since the pulse reflection X scanning method is based on the premise that sufficient ultrasonic waves are radiated to the area where flaw detection is required, the probe used in this method may radiate ultrasonic waves at a wide angle. Desired. Further, in order to determine the position of the scratch, the refraction angle, which is the angle at which the ultrasonic wave is incident on the steel plate 10, needs to have a difference between the probe 100 and the probe 200. Further, in order to accurately determine the position of the scratch, it is desirable that the difference in the refraction angle is large.

Further, since the probe 200 is farther from the welded portion 20 than the probe 100, it can radiate sufficient ultrasonic waves to the entire flaw detection range 30, that is, the range where flaw detection is required. On the other hand, since the probe 100 is closer to the welded portion 20 than the probe 200, the angle at which ultrasonic waves are radiated is smaller (narrower) than that of the probe 200. Therefore, there is a need for a probe that can emit ultrasonic waves at a wide angle and has a refraction angle smaller than that of the probe 200. Therefore, the probe 100 has the above configuration.

The probe 100 is configured with the minimum number of oscillators by determining the number of oscillators according to the length in the width direction of the flaw detection range 30 and the length in the width direction in each of the regions 111A to 116A. Can be done. Regarding the range in which flaw detection is required, the spherical gas holder guideline (Non-Patent Document 1) defines the width from the weld toe to the width of the heat-affected zone when the width of the heat-affected zone is confirmed.

Further, according to the ASME (American Society of Mechanical Engineers), it is stipulated that a margin of 6 mm should be taken into consideration in addition to the flaw detection range defined by the spherical gas holder guideline.

In general, in ultrasonic flaw detection of a spherical gas holder, the probe is often mounted on a self-propelled device, and in that case, the device is welded due to an operator's operation error or the tire of the device slipping. There is a risk of traveling deviating from 2.

Therefore, in the present embodiment, the range in which flaw detection is required is the flaw detection range in consideration of the welding bead width (10 mm), the width of the heat-affected zone (6 mm), the margin (6 mm), and the deviation of the equipment (10 mm). The length of 30 in the width direction was defined as 32 mm.

Next, the probe 100 shown in FIG. 2 was measured according to the method for measuring the performance of the ultrasonic probe described in JIS Z 2350-2002 in order to confirm the spread range of the beam. Specifically, the spread range of the ultrasonic beam was measured using the probe 100 shown in FIG. 2 for the lateral hole contrast test piece RB-SDH.

In measuring the spread range of the ultrasonic beam, after determining the position of the probe 100 where the echo height of the received ultrasonic wave is the largest, the probe 100 is lowered from this echo height by 6 dB. The beam spread range was measured based on the distance traveled by the probe 100 during that time.

Here, a process of detecting the position of the defect portion 21 will be described with reference to FIG. FIG. 3 is a diagram illustrating a process of detecting the position of the defect portion 21. When the oscillator 210 receives ultrasonic waves, the control unit 300 outputs the oscillators (any one of 111 to 116) having the highest reception level among the oscillators 111 to 116. Using the time T1 from the time to reception and the time T2 from the time when the vibrator 210 outputs the ultrasonic wave to the time when the vibrator 210 receives the ultrasonic wave, the vibrator (any one of 111 to 116) having the maximum reception level is used. The position of the defective portion 21 is specified by the angles θ1 and θ2 obtained from the vibrator 210.

For example, as shown in FIG. 3, when the reception level of the oscillator 111 is maximum, the time T1 until the oscillator 111 receives the ultrasonic wave and the time until the oscillator 210 receives the ultrasonic wave. Find T2. The data representing the distance between the vibrator 111 and the vibrator 210 in the Y-axis direction can be obtained by reading from the internal memory by the control unit 300.

The distance L1 obtained by multiplying half the time (T1 / 2) of the time T1 by the speed of sound is the distance from the ultrasonic waves output from the oscillator 111 to the inner surface 14 of the steel plate 10 being reflected to the defective portion 21. .. Similarly, the distance L2 obtained by multiplying half the time (T2 / 2) of the time T2 by the speed of sound is such that the ultrasonic waves output from the oscillator 210 are reflected by the inner surface 14 of the steel plate 10 and reach the defective portion 21. The distance.

Therefore, the angles θ1 and θ2 can be derived by using the distances L1 and L2, the thickness of the steel plate 10, and the distance between the vibrator 111 and the vibrator 210 in the Y-axis direction. The process of identifying the position of the defect portion 21 in this way includes a circle having a radius L1 centered on the center of the output surface of the oscillator 111 and a circle having a radius L2 centered on the center of the output surface of the oscillator 210. It is a process of specifying the position of the defect portion 21 at the intersection of.

FIG. 4 is a diagram showing the spread range of the probe beam in the embodiment. In FIG. 4, the horizontal axis represents the measurement position of the probe 100, and the vertical axis represents the echo height (the level of the received signal). Further, in FIG. 4, channels 1 to 6 correspond to oscillators 111 to 116 of the probe 100, respectively. From FIG. 4, in 1ch to 6ch, the distance traveled by the probe 100 from the maximum echo height to a decrease of 6 dB was 54 mm.

Next, for the probe 100 and the probe 200 whose specifications are shown in Table 1, based on the measurement result of the beam spreading range of the probe 100 and the measurement result of the beam spreading range of the probe 200. Therefore, the range in which flaws can be detected by these probes was determined.

The range in which the probe 100 and the probe 200 in the embodiment can detect a flaw is the ultrasonic waves radiated from the vibrators 111 to 116 shown in FIG. 1 and the ultrasonic waves radiated from the vibrator 210, respectively. It is an overlapping part. From FIG. 1, it can be seen that the flaw-detectable range satisfies the range of 32 mm in which flaw detection is required.

From FIG. 1, it can be seen that the spread range of the beam by the vibrator 111 of the probe 100 exceeds the center of the welded portion 20 and exceeds the range where flaw detection is required. In the pulse reflection X scanning method, it is only necessary to detect the probe side from the center of the welded portion 20, so in the confirmation test described later, it was decided to perform the test using the vibrators 112 to 116 of 2ch to 6ch. ..

Next, using the probe 100 and the probe 200 whose specifications are shown in Table 1, a confirmation test was conducted to confirm whether or not a scratch formed on the test piece could be detected by the pulse reflection X scanning method. As a test piece, a steel plate having a slit 40 having a height of 2 mm was used, and the slit 40 was arranged on the surface on the probe 100 and the probe 200 side to confirm the range in which flaw detection was possible.

FIG. 5 is a diagram showing an outline of a confirmation test using the probe 100 and the probe 200 in the embodiment. Also in FIG. 5, the XYZ coordinate system is defined as shown in the figure. Note that in FIG. 5, the control unit 300 is not shown. Further, FIG. 5 shows a state in which ultrasonic waves are radiated from the transducers 112, 114, and 116 of the probe 100 with dots, and a state in which ultrasonic waves are radiated from the probe 200 by hatching. The results of this confirmation test are shown in Table 2.

In this confirmation test, the distance (distance in the Y-axis direction) from the position regarded as the center of the welded portion 20 to the slit 40 was changed from 0 mm to 35 mm, and the slit 40 could be detected when the detection level was exceeded. Here, as shown in Table 3, it is confirmed that when 2ch to 6ch are used, the slit 40 can be detected even if the distance in the Y-axis direction is 35 mm, which exceeds the range required for flaw detection of 32 mm. did it.

As described above, it was found that by providing the transducer 100 with the vibrators 111 to 116, sufficient ultrasonic waves can be radiated to the range where flaw detection is required. Further, by using the probe 100 and the probe 200 having the above configuration, ultrasonic flaw detection satisfying the flaw detection range 30 can be performed only by moving these probes in the X-axis direction.

According to the ultrasonic probe according to the embodiment, the first probe and the first probe that emit ultrasonic waves to the flaw detection range including the welded portion and receive the ultrasonic waves reflected by the flawed portion of the welded portion, respectively. It is an ultrasonic probe including two detection parts, and the first detection part radiates ultrasonic waves to a plurality of regions in which the flaw detection range is divided into a plurality in the width direction of the welded portion, and at the defect portion. It has a plurality of first transducers that receive reflected ultrasonic waves, and the second probe portion is arranged at a position farther than the plurality of first transducers with respect to the welded portion in the width direction, and has a flaw detection range. By having a second transducer that radiates ultrasonic waves to the entire surface and receives the ultrasonic waves reflected by the defect, it emits sufficient ultrasonic waves to the area where flaw detection is necessary, and it is possible to detect flaws. It is possible to provide an ultrasonic probe that can reduce the time required.

In the above, the mode in which the probe 100 having six oscillators 111 to 116 is arranged closer to the defect portion 21 than the probe 200 having one oscillator 210 has been described. The probe 100 covers the flaw detection range 30 with six oscillators 111 to 116, whereas the probe 200 covers the flaw detection range 30 with one oscillator 210, so that the probe is a probe. It is arranged on the side farther from the defect portion 21 than 100.

The number of oscillators 111 to 116 may be any number as long as they are plural. Further, a plurality of sets of the probe 100 and the probe 200 may be used and arranged in the Y-axis direction to perform ultrasonic flaw detection. Further, a plurality of oscillators 210 may be provided.

Although the ultrasonic probe of the exemplary embodiment of the present invention has been described above, the present invention is not limited to the specifically disclosed embodiment and deviates from the scope of claims. Various modifications and changes are possible without any need.

1 Ultrasonic flaw detector 10 Steel plate 20 Welded portion 21 Defect portion 30 Fault detection range 100 Detector (first probe)
111-116 oscillator (first oscillator)
140 Holding part 150 Shielding part 200 Detector (second probe)
210 oscillator (second oscillator)

Claims (6)

An ultrasonic probe including a first probe and a second probe that radiate ultrasonic waves to the flaw detection range including the weld and receive the ultrasonic waves reflected by the flaws of the weld, respectively. hand,
The first detection unit emits ultrasonic waves to a plurality of regions whose flaw detection range is divided into a plurality of regions in the width direction of the welded portion, and receives the ultrasonic waves reflected by the defect portion. Has one oscillator
The second contact portion is arranged at a position farther than the plurality of first vibrators with respect to the welded portion in the width direction, emits ultrasonic waves over the entire flaw detection range, and has the defect portion. An ultrasonic probe having a second transducer that receives the ultrasonic waves reflected by. The ultrasonic probe according to claim 1, wherein the first probe further includes a holding portion for fixing the plurality of first vibrators so that ultrasonic waves are radiated to the plurality of regions. The first tactile unit is provided between the first oscillators that are adjacent to each other, and further has a shielding portion that suppresses ultrasonic interference between the first oscillators that are adjacent to each other. Ultrasonic transducer. The ultrasonic probe according to any one of claims 1 to 3, wherein the plurality of first oscillators are arranged along the width direction. Any of claims 1 to 4, wherein the number of the plurality of first oscillators is determined according to the length in the width direction of the flaw detection range and the length in the width direction in each of the plurality of regions. Or the ultrasonic probe according to item 1. An ultrasonic probe including a first probe and a second probe that radiate ultrasonic waves to the flaw detection range including the weld and receive the ultrasonic waves reflected by the defect in the weld, respectively.
A drive signal for radiating ultrasonic waves to the first oscillator and the second oscillator of the first probe and the second oscillator is output, and the outputs of the first oscillator and the second oscillator are output, respectively. Equipped with a control unit that performs ultrasonic flaw detection based on
The first detection unit is a plurality of first transducers that radiate ultrasonic waves to a plurality of regions in which the flaw detection range is divided into a plurality of regions in the width direction of the welded portion, and the ultrasonic waves are the plurality of regions. It has a plurality of first transducers that are fixed so as to be radiated to and emit ultrasonic waves, and receive ultrasonic waves reflected by the defect portion.
The second probe is arranged at a position farther than the plurality of first oscillators in the width direction with respect to the welded portion, and emits ultrasonic waves over the entire flaw detection range. Ultrasonic flaw detector with.

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