KR100780709B1 - Underwater ultrasonic flaw detection system - Google Patents

Abstract

According to one embodiment of the present invention, an ultrasonic inspection equipment main body 10 located on the ground, a plurality of underwater cables for signal transmission, one end of which is connected to the ultrasonic inspection equipment main body to be underwater, and the plurality of numbers An underwater probe 40 connected to the other end of the first cable 20 of the middle cable for performing defect detection or thickness measurement of the underwater test body, and the second cable 30 of the plurality of underwater cables It is connected to the other end and includes an underwater output terminal 50 for displaying the output to the output of the main body of the ultrasonic inspection equipment, the output terminal is O-ring in the waterproof housing 60 is provided with a transparent window on the front It is assembled and mounted via a medium to have a waterproof structure, the other end of the underwater cable connected to the probe at least a portion of the inside of the cable connector waterproof waterproofing with a synthetic resin A probe is provided and the transducer is tightly coupled to the lower surface of the synthetic resin to provide an underwater ultrasonic inspection system, characterized in that the waterproof structure.

Since the ultrasonic inspection system according to the present invention retains the advantages of the non-destructive inspection apparatus used on the ground as it is, it is possible to detect square defects in the water or fine defects inside the steel, which were not possible with the conventional underwater ultrasonic inspection apparatus.

Description

Underwater Ultrasound Inspection System {UNDERWATER ULTRASONIC FLAW DETECTION SYSTEM}

1 is a view showing the principle of the ultrasonic inspection.

2 is a view schematically showing the external appearance of the ultrasonic inspection apparatus body.

3 illustrates various types of transducers.

Figure 4a is a rectangular probe wedge, Figure 4b is a view showing a state attached to the probe in Figure 4a.

5 is a perspective view schematically showing an output terminal and a waterproof housing for making it waterproof.

6 is a view schematically showing the rear structure of the output terminal and the waterproof housing assembly.

7 shows an example of use in the hands of an output terminal and a transducer.

8 is a view schematically showing an underwater cable and a connector according to an embodiment of the present invention.

9 is a view showing a waterproof structure of the transducer according to another embodiment of the present invention.

10 is a view showing an application example of the underwater ultrasound inspection system according to a preferred embodiment of the present invention.                 

<Explanation of symbols for the main parts of the drawings>

10: ground ultrasonic inspection device body

20, 30: cable

32, 58: underwater cable connector

40: transducer

43: wedge

44: synthetic resin

50: output terminal

52: O-ring

54: band mounting member

56: wrist mounting band

60: waterproof housing

The present invention relates to an underwater non-destructive inspection system, and more specifically, to the existing underwater ultrasonic inspection system by applying an underwater component to apply the ultrasonic inspection system of excellent reliability and precision to underwater inspection. The present invention relates to a novel underwater ultrasonic inspection system that enables the rectangular exploration of a specimen under water or the detection of minute defects in the specimen.                         

Non-destructive testing, in particular ultrasound, is used to check the location and shape of discontinuities (defects) present in metals and to measure their thickness. This ultrasound scan delivers sound waves with millions of times per second, which are inaudible to human hearing, to the inside of the object (test object) to be tested, and detects the time of sound waves reflected from the discontinuous plane to determine the exact distance. I'm a test. Detecting defects by using an ultrasonic test can be classified into two types, a straight beam test and an angle beam test.

More specifically, vertical surveying is an exploration using a longitudinal wave, which is useful for finding defects that proceed in a direction parallel to the surface of the test object. Rectangular exploration is an exploration using transverse waves, which is particularly useful for inspecting locations such as the bottom of a weld, where it is difficult to apply vertical exploration due to the addition of the weld, whereby dangerous defects occurring in the weld cannot be detected. In this rectangular exploration method, the ultrasonic wave is angled to detect the ultrasonic wave reflected from the defect site, and the ultrasonic wave angle and the ultrasonic wave distance from the sound source are calculated. That is, the inclination distance is the distance from the flaw surface by the trigonometric function. We can calculate the three-dimensional position of the defect by calculating the and depths.

On the other hand, there is an increasing demand for nondestructive testing not only on the ground but also in the water, especially steel structures. That is, the underwater non-destructive inspection is mainly carried out for the detailed underwater safety diagnosis of the structure. When the engineer divers perform a visual inspection and then further inspection is required, the non-destructive inspection is carried out on the parts which cannot be detected by the visual inspection, which does not affect the function of the structure at all. And internal defects and physical properties can be grasped, so it is a necessary test method for precise safety diagnosis. As inspections are carried out underwater, the inspector must be qualified and qualified as an engineer diver for each inspection field. Underwater non-destructive testing method of the steel structure in addition to the above-described ultrasonic inspection method (underwater magnetic particle testing) and cathode system (potential difference measuring method) is used, these methods will be described in more detail As follows.

When a ferromagnetic material is magnetized, magnetic flux inside the material is considered to be a magnetic flow. If a defect such as a crack is present along the path of the magnetic flux, the magnetic flux cannot stop at the defective portion, and the magnetic flux stops or bypasses the defect. Done. At the same time, the magnetic flux at the pole surface portion of the ferromagnetic material leaks outward in the vicinity of the defect, which is called the "defect leak magnetic flux". This leakage increases as the magnetic flux flowing near the defect portion in the ferromagnetic material, the larger the area of the defect blocking the magnetic flux, and the closer the position of the defect is to the surface of the ferromagnetic material. On the other hand, the defect leakage magnetic flux forms a kind of permanent magnet, and when magnetic particles (fine particles of colored ferromagnetic material) are sprayed on them, they are adsorbed to the defect site to form magnetic particles due to the defect. Since this is greatly enlarged compared to the width of the actual defect, even a narrow width defect can be easily detected, and the method of detecting the defect in this manner is called magnetic particle inspection.

On the other hand, steel structures installed in water usually prevent corrosion by using a cathode system. Whether the cathode system is well maintained and the structure is well protected can be determined by measuring the potential difference of the target member. Steels that are adequately protected from corrosion are -0.90 to -0.80 compared to standard electrodes made of silver or silver chloride. Maintain the potential difference between the bolts. By measuring the potential difference of the underwater steels using a Bathycorometer, the method of finding the defects of the steel is the cathode system or the potential difference measuring method.

As described above, various methods are employed for non-destructive inspection of structures in water, but each of these methods has various disadvantages in performing various non-destructive inspections in water.

Specifically, in the case of the conventional underwater ultrasonic inspection method is used only for measuring the thickness of the vertical through vertical exploration, the rectangular exploration at the welding site is not applied. This is because, unlike the vertical exploration, the technique of the inspection method is difficult in the case of the square exploration, even if the entire ultrasonic device is waterproofed and the inspection is carried out in water, recording of the inspection is difficult and reliability is low. Without overcoming these difficulties, current underwater ultrasonic surveys are used only for measuring the thickness of steel by simply using thickness measuring equipment without utilizing many of the advantages of ultrasonic inspection. It is not utilized until the welding site inspection through.

In the case of the magnetic exploration inspection method, the surface defect of the specimen can be easily detected, but the defect inside the specimen is difficult to detect. That is, the defect can be detected when the inspection area is up to about 1/4 inch (about 6 mm) below the surface of the test object. In addition, there is a problem that skill in reading a defect type is required and difficult to apply to rough surfaces.

In the case of the potentiometric method, it is applied only whether the method for the steel structure is properly maintained, and does not detect the presence of a defect inside the specimen.

The present invention is to improve the ultrasonic inspection method of the above problems, in particular, the non-destructive inspection method in the water, by improving the ultrasonic defect detection equipment used in the land to be used in the water, the excellent technical that the ultrasonic inspection has By utilizing and maintaining these advantages, it enables precise and reliable non-destructive testing of underwater structures, especially steel, which has not been possible with conventional ultrasonic flaw detection methods, enabling underwater exploration and finer internal inspection. The purpose is to enable fault detection.

Underwater ultrasonic inspection system according to the present invention for achieving the above object is, the ultrasonic inspection equipment main body located on the ground, the underwater cable for transmitting a plurality of signals that one end is connected to the ultrasonic inspection equipment main body to the water; An underwater probe connected to the other end of the first cable of the plurality of underwater cables for performing defect detection or thickness measurement of the underwater inspector, and connected to the other end of the second cable of the plurality of underwater cables; It includes a separate underwater output terminal for displaying the output to the output unit of the ultrasonic inspection equipment, the underwater output terminal is a waterproof structure is assembled to the waterproof housing provided with a transparent window on the front, The transducer is molded with synthetic resin around its periphery while being connected to the other end of the first underwater cable Air is characterized in that a water-proof structure.

According to another embodiment of the present invention, there is provided an ultrasonic inspection equipment main body located on the ground, an underwater cable for transmitting a plurality of signals connected at one end thereof to the ultrasonic inspection equipment main body, and the plurality of underwater cables. An underwater probe connected to the other end of the cable for performing defect detection or thickness measurement of the underwater test object, and connected to the other end of a second cable of the plurality of underwater cables, and an output of the main body of the ultrasonic inspection apparatus Including a separate underwater output terminal for displaying the output to the output terminal, the underwater output terminal is assembled into a waterproof housing provided with a transparent window on the front is a waterproof structure, the other of the underwater cable connected to the probe The end is provided with a cable connector at least a portion of which is waterproofed with a synthetic resin; The transducer is provided in close contact with the lower surface of the synthetic resin is provided with an underwater ultrasonic inspection system characterized in that the waterproof structure.

According to a preferred embodiment, the output terminal is mounted to the waterproof housing via an O-ring.

According to a preferred embodiment, the transducer and the cable connector are provided with corresponding threaded portions, respectively, and the transducer is configured to be in close contact with the lower surface of the synthetic resin while being screwed with the cable connector.                     

According to a preferred embodiment, the other end of the underwater cable connected to the underwater output terminal is provided with an underwater cable connector configured to be connected to the underwater cable connector provided in the output terminal.

According to a preferred embodiment, the assembly of the underwater output terminal and the waterproof housing is configured to be attached to the wrist of the diver.

According to a preferred embodiment, the rear surface of the assembly is provided with a band mounting member, and further includes a band fitted to the member and mounted on the wrist.

According to a preferred embodiment, the same form as the output displayed on the output unit of the ultrasonic inspection apparatus main body is output to the underwater output terminal.

According to a preferred embodiment, the invention further comprises a communication system for two-way communication between the underwater diver and the ground inspector.

According to a preferred embodiment, the present invention further comprises a wedge for generating a shear wave during rectangular exploration, wherein the wedge is mounted with the probe.

The objects, features and advantages of the present invention described above will be more clearly understood through the following detailed description of preferred embodiments of the present invention with reference to the accompanying drawings.

Prior to describing the embodiments of the present invention, various components of the present invention will be described with reference to the accompanying drawings, and detailed descriptions of the configuration or operation of devices already known in the art will be omitted. .

1. Principle of Ultrasonic Testing

Ultrasonic flaw detection is usually used for the pulse reflection method. In the pulse reflection method, an ultrasonic pulse having an extremely short duration is transmitted from the surface of the test object to the inside of the test object, and ultrasonic waves (echo) reflected by a defect in the test object are detected. The size of the defect can be estimated from the size of the echo and the area where the echo is detected, and the time until the transmitted ultrasonic pulse is received is shown as a distance to find the position of the defect. This is shown in the output of the ultrasonic flaw detector (for example, a screen), a scale plate is drawn on the front of the screen, the horizontal axis represents the distance to the defect, the vertical axis represents the size of the echo.

1 is a view showing the principle of the ultrasonic inspection. As shown in the figure, ultrasonic waves are sent to the surface (test surface) of the test object or ultrasonic waves are transmitted to the inside of the probe which can be received. When the ultrasonic wave reflected from the inside is received, it is determined that there is a defect inside the object. The location of the defect is measured in time until the transmitted ultrasound is received. The size of the defect is also measured from the height of the received echo or the range in which the defect echo appears.

2. Ultrasonic Examination Device

2 schematically shows the appearance of the ultrasonic inspection apparatus main body 10. Ultrasonic inspection device The main body 10 is a device that is commonly used for nondestructive inspection on the ground. In the output part of this main body, the flaw detection form by the pulse voltage transmitted from the probe 40 mentioned later is represented. That is, the intensity of the reflected wave is displayed on the vertical axis, and the time at which the reflected wave is returned is converted to the horizontal axis. Since the configuration and operating principle of such an inspection apparatus are already known in the art, a detailed description of the inspection apparatus main body is omitted here.

3. Probe

The transducer 40 is a device that converts an electrical signal into sound (ultrasound), sends ultrasonic waves in contact with a test object, and detects reflected sound waves. Various sizes and frequencies are selected depending on the nature of the test. High frequencies have high sensitivity but low resolution, while low frequencies have the opposite characteristics.

The transducers are divided into vertical use and rectangular use according to the use, and the appearance of various types of transducers is shown in FIG. 3.

On the other hand, in the case of rectangular exploration using a probe, a mechanism called a wedge, which can give an angle to the progress of ultrasonic waves, is used. That is, the wedge is a tool for generating a shear wave, and there are wedges of various angles (eg, 45 °, 60 °, 70 °, etc.). 4A shows a wedge 43 with a rectangular probe and a wedge with a probe 40 attached to FIG. 4B.

According to the present invention, the probe 40 has a waterproof structure except for a portion in contact with the surface of the test object, so that the diver can use it underwater. According to one embodiment of the present invention, as shown in Fig. 8, the transducer is molded with a synthetic resin to have a perfect waterproof structure, and such a mold processing portion 41 is integrally formed with an underwater cable. According to another embodiment of the invention, as shown in FIG. 9, an underwater cable connector 42 with a thread formed therein is provided at one end of the cable 20, and at least a portion of the inside of the connector. Is waterproofed with a synthetic resin (44), the waterproof cable connector is provided with a screw-type coupling portion corresponding to one end, so that the transducer that enhances the adhesion with the connector is screwed to the bottom of the synthetic resin to close As a result, the transducer and the cable connector are simultaneously combined into a complete waterproof structure.

4. Underwater output terminal and waterproof housing

According to one important feature of the invention, as shown in Fig. 10, a separate underwater output terminal 50 is provided, which not only allows the diver to perform a precise underwater ultrasonic test, but also depending on the situation Even divers who do not have a high level of expertise can perform underwater ultrasounds. That is, the output terminal 50 displays a signal from the transducer 40 appearing at the output of the ultrasonic inspection apparatus 10, and the diver in the water directly checks the signal displayed at the output of the ultrasonic inspection apparatus. It is a component to make it possible.

Specifically, the signal from the transducer 40 is first displayed on the output of the ultrasonic inspection apparatus main body 10 on the ground so that the inspector 80 on the ground (FIG. 10) can check the defect of the specimen. According to the present invention, there is provided a separate underwater output terminal 50 which is configured to be carried by a diver so that the same output as that displayed on the output of the inspection apparatus main body appears on the output terminal. . Therefore, since the diver can directly check the specific echo type displayed on the output terminal 50, not only the inspector on the ground but also the diver can directly detect the position and the shape of the defect in the field, and the underwater communication system It is possible to accurately mark the position of a defect without using. In addition, even if the diver does not have sufficient expert engineer knowledge, the echo form displayed on the portable output terminal 50 makes it easy to check whether there is a defect in the test object, and the instruction of the ground inspector through the usual underwater communication system. The inspection object can be inspected by the inspector, and the details of the defect detected by the inspection object can be inspected by a ground inspector having expert engineer's knowledge while watching the output of the inspection apparatus main body 10. Such an output terminal is not limited to a specific type as long as it can display the echo form displayed on the output of the ultrasonic inspection apparatus. For example, the output terminal may take the form of a CRT, LCD, or the like.

In addition, the diver can transmit and receive the inspection matters to the inspector on the ground by using a conventional underwater communication system (not shown) that can communicate with the ground, so that a precise record can be created.

According to the present invention, the output terminal 50 has a waterproof structure similar to the probe 40. 5 schematically shows a structure for achieving such a waterproof structure. That is, the O-ring 52 is attached to the output terminal 50 in the groove formed in the contact surface with the waterproof housing 60. The output terminal 50 configured as described above is coupled to a waterproof housing 60 having, for example, a transparent window 62 made of Lexan, so that the diver can see the output terminal underwater.

On the other hand, according to a preferred embodiment of the present invention, the assembly of the output terminal 50 and the waterproof housing 60 is configured to be attached to the wrist of the diver, so that the diver can conveniently perform underwater ultrasound inspection . That is, as illustrated in FIG. 6, a band mounting member 54 is attached to the rear surface of the assembly of the waterproof housing 60 and the output terminal 50 so that the band can be fitted. The band mounting member is fitted with a band (e.g., a velcro band, commonly referred to as a "beep") 56 to attach to the wrist of the diver. One embodiment of its use is shown in FIG. 7. The diver wraps the assembly of the waterproof housing 60 and the output terminal 50 in which the band is fitted, and the transducer 40 only carries the finger with the finger, and only the transducer is waiting for the test object. The test can be performed while looking at the terminal. Although the figure shows carrying both the assembly of the waterproof housing 60 and the output terminal 50 and the transducer 40 in one hand, the present invention is not limited to such usage. That is, according to a preferred embodiment of the present invention, the assembly can be carried out while holding the assembly in one hand and the transducer in the other hand, so that the echo type displayed on the output terminal is shaken regardless of the movement of the transducer on the test object. Is displayed without.

5. Underwater Cable

According to the present invention, a plurality of underwater cables are provided. That is, as shown most clearly in FIG. 10, the cable 20 is a cable connected to the ultrasonic testing apparatus body 10 and the transducer 40 to transmit a signal therebetween, and the cable 30 is an ultrasonic wave. It is a cable which transmits the output shown in the output part of the test | inspection apparatus main body 10 to the output terminal 50 which a diver carries or carries.

According to one embodiment of the present invention, the one end of the coaxial cable 20 is connected to the probe 40 to mold the transducer with a synthetic resin to obtain a waterproof structure.

According to another embodiment of the invention, as shown in FIG. 9, an underwater cable connector is provided at an end of the underwater cable that is coupled to the transducer 40 and at least a portion of the interior of the connector is made of synthetic resin 44. ), And the inside thereof may have a threaded structure. In such a configuration, unlike the embodiment in which the transducer is integrally molded with the cable connector to form a waterproof structure, the probe 40 provided with a screw-coupled connector having a structure corresponding to the thread of the connector is synthesized in the connector. By tightly screwing to the bottom surface of the resin, the connector and the probe can be completely waterproof at the same time.

Meanwhile, as shown in FIG. 10, an underwater cable connector 32 is provided at one end of the underwater cable 30, and is coupled with the connector 58 provided in the output terminal 50, thereby outputting the output terminal and the ultrasonic wave. Transmit signals between inspection device bodies.

Preferred Embodiments of the Invention

10 schematically shows an underwater ultrasound inspection system according to one embodiment of the invention. In the figure, the upper side represents the ground and the lower side represents underwater.

One end 24 of the cable 20 is connected to the ultrasonic inspection apparatus main body 10, and the other end is connected to the probe 40 molded with a synthetic resin. One end 34 of the cable 30 is connected to the ultrasonic inspection apparatus main body 10, and the other end cable connector 32 is connected to the cable connector 58 of the output terminal 60.

On the other hand, prior to the specific exploration, the calibration operation for the probe and the like. That is, even if the defects are the same size, the defect echo may or may not be detected at the output of the inspection apparatus by changing the sensitivity of the ultrasonic inspection apparatus. In addition, the experimental results should be reproducible. For this purpose, the criteria for evaluation of echo height should be set and the flaw detection sensitivity should be corrected. On the other hand, in order to know the location of the detected defect, it is necessary to know the incident point and the refraction angle of the rectangular probe during the rectangular exploration, which should be checked before and after the inspection because the wedge may change as the wear occurs during use. . As such, the sensitivity calibration and the characteristics calibration of the ultrasonic inspection apparatus including the probe required for the flaw detection are carried out using standard test pieces, which are divided into the vertical flaw detection and the square flaw detection. The purpose of the standard specimens is to measure the incidence point and angle of refraction of the rectangular probe, to adjust the measurement range, to adjust the flaw detection sensitivity, and to measure the comprehensive performance of the flaw detector. Various specimens are used according to the purpose.                     

The diver 70 wears a surface-fed diving equipment (not shown) that is free to communicate with the land and has no limitation in diving time, and performs underwater ultrasound inspection. First, the diver 70 is worn on the wrist of the probe 40 of the above-described waterproof structure, the output terminal 50 and the waterproof housing 60, which has been previously calibrated as described above on the ground and the test object (the present invention) According to a preferred embodiment of the steel sheet).

Next, the diver 70 contacts the probe 40 with the test object to perform exploration according to the purpose. According to the present invention, unlike the existing underwater ultrasonic inspection system, since the ultrasonic inspection apparatus used for non-destructive inspection on the ground can be used for exploring the underwater inspection object, the ultrasonic inspection apparatus has Many benefits are available. Accordingly, the diver can find defects by performing rectangular exploration not only in the vertical exploration for measuring the thickness but also in the areas where the vertical exploration cannot find the defects, such as a welded portion. In this rectangular exploration, the probe 40 is attached to the rectangular exploration wedge 43 as shown in FIG. 4A to perform the exploration.

More specifically, the diver 70 contacts the probe to the test object during vertical exploration, and the ground tester 80 reads and records the measured value precisely. Next, during the rectangular exploration, such as inspection of the welded portion, the diver can explore the defective portion while only seeing the reaction appearing on the output terminal 50 (this is the reaction appearing on the output portion of the ultrasonic inspection apparatus on the ground), Some divers also report the size of the defect directly to the surface of the specimen or measure the size and notify the ground. This communication is carried out through known underwater communication systems. Such a communication system is already known in the art, and the detailed configuration or operation thereof will be omitted herein. Therefore, according to the present invention, the diver can perform ultrasonic exploration even if only the ability to take necessary measures through communication with the ground while only checking the reaction appearing on the output terminal 50.

On the other hand, the inspector 80 on the ground reads the distance between the probe and the defective portion through the contents displayed on the output portion of the ultrasonic inspection apparatus 10 so that the exact depth of the defective portion and the marking point on the surface of the specimen can be read. Calculate and record the actual distance.

As described above, the underwater ultrasonic inspection system according to the present invention, using the existing non-destructive inspection apparatus, without significant cost increase or additional expensive equipment, can detect and weld fine defects of underwater structures, especially steel materials, which were not previously possible. By enabling rectangular exploration of the site, reliable inspection data can be provided for regular or emergency safety diagnosis of various structures such as bridges, pipelines, etc. located in the water. Therefore, it provides a great help in the regular maintenance of various underwater structures, and can be usefully used for emergency inspection of the underwater structure due to accidents or natural disasters, inspection of major specific parts, and the like.

In addition, unlike the existing underwater ultrasonic inspection apparatus, a diver who is an underwater inspector can use the underwater ultrasonic inspection system of the present invention as long as he has only the qualification as a diver, and has the ability to take necessary measures through communication with the ground. Ultrasonic examination of specific structures can be performed underwater.

Claims (18)

The ultrasonic inspection equipment body located on the ground, A plurality of underwater cables for signal transmission, one end of which is connected to the ultrasonic inspection apparatus main body and continues in the water; An underwater probe connected to the other end of the first cable among the plurality of underwater cables, for performing defect detection or thickness measurement of the underwater inspector; An underwater output terminal connected to the other end of the second cable among the plurality of underwater cables and for displaying contents outputted at an output of the main body of the ultrasonic inspection apparatus; Wedges that generate shear waves during rectangular exploration and are equipped with the transducers Including, The output terminal is assembled to a waterproof housing provided with a transparent window on the front is a waterproof structure, The probe is molded in a synthetic resin and connected to the other end of the first underwater cable has a waterproof structure Underwater ultrasound inspection system characterized in that. The underwater ultrasonic inspection system according to claim 1, wherein the output terminal is mounted to the housing via an O-ring. The ultrasonic inspection equipment body located on the ground, A plurality of underwater cables for signal transmission, one end of which is connected to the ultrasonic inspection apparatus main body and continues in the water; An underwater probe connected to the other end of the first cable among the plurality of underwater cables, for performing defect detection or thickness measurement of the underwater inspector; An underwater output terminal connected to the other end of the second cable among the plurality of underwater cables and for displaying contents outputted at an output of the main body of the ultrasonic inspection apparatus; Wedges that generate shear waves during rectangular exploration and are equipped with the transducers Including, The output terminal is assembled to a waterproof housing provided with a transparent window on the front is a waterproof structure, The other end of the underwater cable that is connected to the probe is provided with a cable connector at least a portion of the inside waterproofed with a synthetic resin and the transducer is tightly coupled to the lower surface of the synthetic resin to be a waterproof structure Underwater ultrasound inspection system characterized in that. The underwater ultrasonic inspection system according to claim 3, wherein the output terminal is mounted to the housing via an O-ring. The underwater ultrasonic inspection system according to claim 3, wherein the probe and the cable connector are provided with corresponding threaded portions, and the transducer is in close contact with the bottom surface of the synthetic resin while being screwed with the cable connector. The underwater ultrasonic test according to any one of claims 1 to 5, wherein the other end of the underwater cable connected to the output terminal is provided with an underwater cable connector configured to be connected to the underwater cable connector provided in the output terminal. system. The underwater ultrasonic inspection system according to any one of claims 1 to 5, wherein the combination of the output terminal and the waterproof housing is configured to be attached to the wrist of the diver. The underwater ultrasonic inspection system according to claim 7, further comprising a band mounted on a rear surface of the assembly, the band being fitted to the member and mounted on the wrist. The underwater ultrasonic test system according to any one of claims 1 to 5, wherein the same type as the output displayed on the output unit of the ultrasonic testing apparatus main body is output to the underwater output terminal. The underwater ultrasonic test system according to claim 6, wherein the same type as the output displayed on the output of the main body of the ultrasonic testing apparatus is output to the underwater output terminal. The underwater ultrasonic test system according to claim 7, wherein the same type as the output displayed on the output unit of the ultrasonic testing apparatus is output to the underwater output terminal. The underwater ultrasonic test system according to claim 8, wherein the same type as the output displayed on the output unit of the ultrasonic testing apparatus is output to the underwater output terminal. The underwater ultrasonic inspection system according to any one of claims 1 to 5, further comprising a communication system for bidirectional communication between the underwater diver and the ground inspector. The underwater ultrasound inspection system according to claim 6, further comprising a communication system for bidirectional communication between the underwater diver and the ground inspector. The underwater ultrasonic inspection system according to claim 7, further comprising a communication system for bidirectional communication between the underwater diver and the ground inspector. The underwater ultrasonic inspection system according to claim 8, further comprising a communication system for bidirectional communication between the underwater diver and the ground inspector. The underwater ultrasonic inspection system according to claim 9, further comprising a communication system for bidirectional communication between the underwater diver and the ground inspector. delete

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