KR102044990B1 - Ultrasonic testing method - Google Patents

Abstract

An ultrasonic flaw detection method is provided. The ultrasonic flaw detection method according to the present invention includes a reference specimen ultrasonic flaw detection step, reference specimen flaw detection information acquisition step, reference specimen flaw detection information storage step, a flaw detection material flaw detection step, and defect determination step.

Description

Ultrasonic Scanning Method {ULTRASONIC TESTING METHOD}

The present invention relates to an ultrasonic flaw detection method.

In general, the thick plate is subjected to non-destructive inspection to inspect the internal quality, as high quality control of the internal quality of the steel sheet before shipment is required according to the quality requirements of the consumer.

Ultrasonic flaw detection is a typical technique of nondestructive testing.

Ultrasonic flaw detection is a technique for examining the presence of defects in steel sheets and other media, ie, defects, by reflecting sound waves within a boundary of media having different density characteristics.

When inspecting the quality inside the steel sheet by the general ultrasonic inspection technique, the following results are obtained.

When inclusions, cracks, scratches, dents, holes, and the like exist in the steel sheet, a phenomenon in which sound waves are reflected at the interface between the steel sheet and the inclusions occurs.

The reflected ultrasound is detected by the transducer along with information such as its location and intensity. Usually, the ultrasonic probe is configured to scan two-dimensionally the surface of the steel sheet.

Defect information of each point detected by the two-dimensional scanning operation of the ultrasonic probe may be provided as a graphic screen by an image processing apparatus connected to the ultrasonic flaw detector.

In addition to the development of new steel grades, internal quality inspection suitable for new steel grades is required.

The present invention is to provide an ultrasonic flaw detection method that can more accurately detect the internal defects of the special steel produced by adding the alloy component in addition to carbon by alloying component, thickness.

Ultrasonic flaw detection method according to an embodiment of the present invention, by using a flaw probe of the ultrasonic flaw detection apparatus may include the ultrasonic flaw detection step of the reference specimen by projecting the ultrasonic sound velocity set on the reference specimen formed with a plurality of artificial defects .

Ultrasonic flaw detection method obtains flaw detection information of reference specimen from ultrasonic flaw detector by receiving reflected wave information reflected from surface of reference specimen, artificial defect and opposing surface opposite to surface of reference specimen after ultrasonic wave reaches reference specimen. It may include the step of obtaining the specimen test information.

Ultrasonic flaw detection method stores the flaw characteristic curve indicating flaw characteristics of the reference specimen, artificial defects and opposing surface through the flaw detection information and saves the ultrasonic sound velocity information projected on the reference specimen. It may include.

The ultrasonic flaw detection method may include an ultrasonic flaw detection step in which an ultrasonic flaw is projected by projecting the ultrasonic wave velocity onto the target flaw to be subjected to the ultrasonic flaw using the flaw probe of the ultrasonic flaw detector after the ultrasonic flaw detection of the reference specimen is completed. .

Ultrasonic flaw detection method receives ultrasonic wave information reflected from the surface of the flaw material, the set height and the opposite surface facing the surface of the flaw material after the ultrasonic wave reaches the flaw face material, and detects flaw flaw information of the flaw face material. It may include the step of obtaining the flaw detection information obtained from the.

The ultrasonic flaw detection method includes a defect determination step of determining whether or not a flaw is detected by comparing the flaw detection information obtained in the flaw detection information acquiring step with the flaw detection information obtained in the reference flaw detection information storage step. can do.

Before the ultrasonic flaw detection step, it may include a reference specimen preparation step of preparing a reference specimen having the same alloying component and the same size and thickness as the target material to be ultrasonic flaw detection.

Between the reference specimen preparation step and the ultrasonic flaw detection step, it may include a reference specimen input step of injecting the reference specimen in the lower direction of the ultrasonic flaw detection apparatus along the direction of progress of the specimen.

In the step of saving the reference specimen inspection information, the reference ultrasonic wave is determined as the reference ultrasonic sound velocity by searching for an ultrasonic sound velocity in which the flaw characteristic curves of the surface of the reference specimen, the artificial defect and the opposing surface are created based on the relationship between the reflected wave and the projection distance through the reference specimen inspection information. Sound speed determination step.

In the step of storing the specimen test information, the reference surface echo curve, the reference defect echo curve, and the reference bottom echo curve are generated by the relationship between the reference ultrasonic sound velocity and the projection distance reflected from the reference specimen surface, the artificial defect and the opposing surface, respectively. And storing and displaying a reference specimen flaw characteristic curve file to be stored and displayed as a file in the storage and display unit.

Injecting the to-be-detected material into the ultrasonic flaw detection device, it may include the step of providing the flaw detection material information to provide the component information and the thickness information of the flaw detection material from the information storage and display to the ultrasonic flaw detection controller.

If the alloying component and thickness information of the test specimen is input to the information storage and display unit, the method may include uploading a standard specimen flaw characteristic curve for selecting and uploading a flaw characteristic curve file of the reference specimen corresponding to the alloy composition and thickness information of the specimen. Can be.

After performing the standard specimen flaw detection curve uploading step, the defect determination step may include a projection ultrasonic sound velocity selection step of selecting the reference ultrasonic sound velocity determined in the reference ultrasonic sound velocity determination step as the projection ultrasonic sound velocity of the inspected material.

The defect determination step includes a surface ECO curve, a surface height ECO curve, and a surface bottom ECO curve of the to-be-detected material in relation to the projection ultrasonic sound velocity reflected from the surface, the set height, and the opposing surface, respectively. It may include the step of creating a flaw detection curve for the flaw detection material.

The defect determination step may include: the specimen surface echo curve, the specimen height echo curve, and the specimen bottom echo curve, the reference surface echo curve uploaded in the reference specimen flaw characteristic curve uploading step, the reference defect echo curve, and A curve comparison step may be included comparing the reference bottom echo curve.

The curve comparing step may be to determine the defect of the to-be-inspected material when at least one or more bends are generated in the to-be-inspected height echo curve or a waveform is formed out of the curve.

The reference specimen may be formed with a plurality of flat holes of artificial defects in the form of circular grooves from the opposite surface, and the flat holes of the plurality of artificial defects may have different heights from opposite surfaces of the reference specimen.

The flat bottom hole of the plurality of artificial defects may be formed in plural along four corners of the reference specimen or the diagonal of the reference specimen.

The reference specimen may be manufactured in a step shape having a plurality of steps formed with a set width, thickness, and length, and the flat bottom holes of artificial defects may be formed in the plurality of steps, respectively.

The area in which the plurality of stepped portions are formed may be formed to be the same as or larger than the size of the ultrasonic wave of each one probe when the plurality of flaw probes are arranged in the ultrasonic flaw detector.

The specimen may be a high manganese steel plate.

According to the embodiment of the present invention, the non-destructive inspection work in the continuous plate production process has the effect of quickly and accurately to detect the internal defects of the alloy-containing special steel by alloying, thickness.

1 is a schematic configuration diagram of an ultrasonic flaw detection method according to an embodiment of the present invention.
2 is a schematic configuration diagram of an apparatus used in the ultrasonic flaw detection method according to an embodiment of the present invention.
3 is a graph showing the relationship between the length of the ultrasonic wave direction (distance) and the reflected wave according to the ultrasonic scanning method according to an embodiment of the present invention.
Figure 4 is a graph comparing the relationship between the length of the ultrasonic wave direction and the reflected wave of the characteristic curve of the reference specimen and the specimen according to the ultrasonic flaw detection method according to an embodiment of the present invention.
5 is a graph showing a relationship between an ultrasonic wave traveling direction length and a reflected wave of defects detected by an ultrasonic flaw detection method according to an exemplary embodiment of the present invention.
6 is a schematic partial cutaway perspective view of a reference specimen of a first embodiment used in an ultrasonic flaw detection method according to an embodiment of the present invention.
FIG. 7 is a schematic plan view of FIG. 6, which is a bottom view showing a location of a reference specimen artificial defect of a first embodiment;
8 is a schematic cross-sectional view of the reference specimen of the second embodiment used in the ultrasonic flaw detection method according to an embodiment of the present invention.
FIG. 9 is a schematic bottom view of FIG. 8 and illustrates a reference specimen artificial defect position according to the second embodiment.
10 is a schematic perspective view of a reference specimen of a second embodiment used in the ultrasonic flaw detection method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art can easily understand, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible, the same or similar parts are represented using the same reference numerals in the drawings.

The terminology used below is merely to refer to specific embodiments, and is not intended to limit the present invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” embodies a particular characteristic, region, integer, step, operation, element and / or component, and other specific characteristics, region, integer, step, operation, element, component and / or group. It does not exclude the presence or addition of.

All terms including technical terms and scientific terms used below have the same meaning as those commonly understood by those skilled in the art. Terms defined in advance are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

1 is a schematic configuration diagram of an ultrasonic flaw detection method according to an embodiment of the present invention, Figure 2 is a schematic configuration diagram of a device used in the ultrasonic flaw detection method according to an embodiment of the present invention.

3 is a graph showing the relationship between the length of the ultrasonic wave direction (distance) and the reflected wave according to the ultrasonic scanning method according to an embodiment of the present invention.

Figure 4 is a graph comparing the relationship between the length of the ultrasonic wave direction and the reflected wave of the characteristic curve of the reference specimen and the specimen according to the ultrasonic flaw detection method according to an embodiment of the present invention.

5 is a graph showing the relationship between the length of the ultrasonic wave direction and the reflected wave for the defects detected by the ultrasonic flaw detection method according to an embodiment of the present invention.

Hereinafter, in the ultrasonic flaw detection method according to an embodiment of the present invention, an ultrasonic flaw detection method for a high manganese steel plate (hereinafter, referred to as the 'detection material') containing manganese (Mn) among special steels It demonstrates as an example.

Here, the term 'high manganese steel plate' refers to a thick plate product containing 3 to 27 wt% of manganese.

The present invention is not limited thereto, and the present invention is applicable to all methods for determining defects by ultrasonically inspecting special steel containing various alloy components including high nickel steel and high creme steel in addition to high manganese steel.

1 to 5, the ultrasonic flaw detection method according to an embodiment of the present invention, the reference specimen preparation step (S100), the reference specimen input step (S110), the reference specimen ultrasonic flaw detection step (S120), reference specimen flaw detection Information acquisition step (S130), and reference specimen flaw detection information storage step (S140) may be included.

The reference specimen preparation step (S100) may prepare the reference specimen 200 having the same alloying component (manganese content) and the same size as the specimen to be ultrasonically inspected and having a plurality of artificial defects.

Reference specimen 200 may be prepared for each alloy component (manganese content), each thickness.

The reference specimen 200 may be formed with a plurality of artificial defects in the form of circular grooves having a size set from the bottom surface.

In this context, the term "bottom" refers to an opposing surface opposite the surface of the reference specimen of the reference specimen.

Artificial defects of the reference specimen 200 may be formed to have different diameters, heights (depths), directions, or the same.

Here, the "height" of the artificial defect refers to the length from the bottom of the reference specimen 200 to the surface direction, and the "depth" of the artificial defect refers to the bottom from the surface of the reference specimen 200 Indicates the length in the direction.

 Artificial defects may be formed so that the bottom of the groove forms a flat bottom hole shape.

In addition, the artificial defect may be formed in accordance with the size and the thickness that is the defect determination criteria of the test specimen (thick manganese steel thick plate) for each thickness of each alloy component.

In the reference specimen input step (S110), the reference specimen 200 may be introduced into the lower portion of the ultrasonic flaw detection apparatus 100 along the moving direction (X direction) of the specimen 10.

The reference specimen ultrasonic flaw detection step (S120) may perform ultrasonic flaw detection by projecting an ultrasonic sound velocity set on the reference specimen 200 input to the ultrasonic flaw detector 100 using the flaw probe 110 of the ultrasonic flaw detector 100.

The flaw detection probes 110 are provided in plural at regular intervals along the width direction of the ultrasonic flaw detection apparatus 100 (direction -Y direction orthogonal to the advancing direction of the target material) and flaw detection in the width direction (Y direction) of the reference specimen 200 This is possible.

Accordingly, the reference specimen ultrasonic flaw detection step (S120) is the ultrasonic flaw detection along the width direction of the reference specimen 200 from the front end surface to the rear end surface of the reference specimen 200 when the reference specimen passes through the ultrasonic flaw detection apparatus 100. Can be done.

In the reference specimen flaw detection step (S130), after the projected ultrasound reaches the reference specimen 200, the ultrasonic flaw detector 300 receives reflected wave information reflected from the surface, artificial defect, and bottom of the reference specimen 200, respectively. Receiving the flaw detection information of the reference specimen 200 can be obtained.

In the reference specimen flaw information storage step (S140), the flaw characteristic curve representing the flaw characteristic of the surface, artificial defects and bottom of the reference specimen 200 is generated and stored using the acquired reference specimen flaw information and stored in the reference specimen 200. The projected ultrasonic sound velocity information can be stored.

In the reference specimen flaw detection step (S140), the ultrasonic sound velocity at which the flaw detection curves of the surface, artificial defects and the bottom of the reference specimen 200 are created in relation to the reflected wave and the projection distance is obtained through the acquired reference specimen flaw information. The reference ultrasonic sound velocity determination step (S141) may be determined to determine the reference ultrasonic sound velocity.

The reference specimen flaw detection step (S140) includes a reference surface echo curve B1 and a reference defect echo curve B2 in relation to the reference ultrasonic sound velocity and the projection distance reflected from the surface, the artificial defect, and the bottom surface of the reference specimen 200, respectively. And a reference specimen flaw characteristic curve storage and display step S143 for creating a reference bottom echo curve B3 and storing and displaying the information in a file and storing and displaying the information in the display unit 400.

Ultrasonic flaw detection method of the present invention provides the specimen information providing step (S200), the standard specimen flaw characteristic curve uploading step (S210), the projection ultrasonic sound velocity selection step (S220), the flaw detection material ultrasonic flaw detection step (S230), the flaw detection material Scanning information acquisition step (S240) may be included.

In the step of providing the target material information (S200), after the ultrasonic flaw detection of the reference specimen 200 is completed, when the sample 10 is inserted into the lower portion of the ultrasonic flaw detector 100, the alloying component of the sample 10 ( Manganese content) and thickness information may be input to the information storage and display unit 400, and the information may be provided to the ultrasonic flaw detector 300.

In the step of uploading the standard specimen flaw characteristic curve (S210), when the alloying component (manganese content) and thickness information of the to-be-tested material 10 are input to the information storage and display unit 400, the information-storage and display unit 400 is detected. The flaw detection curve file of the reference specimen 200 corresponding to the alloy component (manganese content) and thickness information of (10) can be selected and uploaded.

Then, after performing the reference specimen flaw characteristic curve uploading step (S210), the projection ultrasonic sound speed selection step (S220) is the reference ultrasonic sound speed determined in the reference ultrasonic sound speed determination step (S141) as the projection ultrasonic sound velocity of the inspected material (10). Can be selected.

Ultrasonic flaw detection step (S230) is a flaw detection material from the front end surface of the flaw detection material 10 introduced into the ultrasonic flaw detection device 100 by using the flaw detection probe 110 of the ultrasonic flaw detection device 100 Ultrasonic flaw detection can be carried out by projecting the projected ultrasonic sound velocity to 10.

In the step of acquiring the flaw detection material (S240), after the projected ultrasound reaches the flaw detection material 10, the reflection wave information reflected from the surface, the set depth, and the bottom surface of the flaw detection material 10 is detected. Can acquire ash flaw detection information.

Here, the "" bottom "" of the to-be-tested material 10 refers to the opposing surface which opposes the surface of the to-be-tested material 10. FIG.

Here, the set depth of the to-be-tested material 10 points out the length from the surface of the to-be-tested material 10 to a bottom face direction.

The set depth of the specimen 10 may be set equal to the depth of the artificial defect of the reference specimen 200.

In addition, the ultrasonic flaw detection method according to an embodiment of the present invention may include a defect determination step (S300).

Defect status determination step (S300) is compared with the specimen inspection information obtained in the specimen inspection information acquisition step (S240) and the reference specimen inspection information obtained in the reference specimen inspection information storage step (S140) to detect the specimen ( 10) can be determined.

In addition, the defect determination step (S300), the test object surface echo curve (P1), the target material in the relationship between the projection ultrasonic sound velocity and the projection distance reflected from the surface, the set height and the bottom surface of the target material 10, respectively It is possible to include a height flaw detection curve (P2), and the flaw detection material flaw detection curve creation step (S310) for producing the flaw detection material bottom echo curve (P3).

Defect check step (S300), the specimen surface echo curve (P1), the specimen height echo curve (P2), and the specimen surface echo curve (P3), the reference specimen flaw characteristic curve uploading step (S210) The reference surface echo curve B1, the reference defect echo curve B2, and the reference bottom echo curve B3 may be compared with each other.

The set height of the specimen 10 in the step of acquiring the flaw detection material information S240 is equal to the height of the artificial flaw from the bottom of the reference specimen 200 so as to make it possible to determine whether the flaw of the flaw material 10 is free. The same can be set.

Curve comparison step S320 may be determined to be a defect of the to-be-inspected material 10 when at least one or more bends are generated in the to-be-inspected material height echo curve P2 or a waveform is formed out of the curve.

In addition, in the defect determination step (S300), the defect length may be determined by the bending of the defect or the distance (mm) of the waveform on the X axis of FIG. 3.

In the defect determination step (S300), the defect width is between the flaw probes which flaw a defect of the flaw height echo curve P2 among the flaw detectors 110 installed at regular intervals in the width direction in the ultrasonic flaw detector 100. Can be determined as distance.

In the defect determination step (S300), the defect height may be determined as the bending of the defect in the Y axis of FIG. 3 or the height (dB) of the waveform.

Hereinafter, the process of the ultrasonic flaw detection method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

First, a reference specimen 200 having the same manganese content and the same size and thickness as the target specimen 10 for which the ultrasonic flaw detection is desired and having a plurality of artificial defects is prepared (S100).

The reference specimen 200 thus prepared is introduced into the ultrasonic flaw detector 100 from its front end face (S110). At this time, the reference specimen 200 is introduced using the conveying roller 11 along the advancing direction (X direction of FIG. 2) of the target material 10.

That is, as shown in FIG. 3, the lower end of the flaw probe 110 of the ultrasonic flaw detector 100 continuously passes from the front end face (start point) to the rear end face (end point) of the reference specimen 200.

When the reference specimen 200 passes through the flaw detection probe 110, the flaw detection probe 110 projects the ultrasonic sound velocity set on the reference specimen 200 passing through the flaw detection (S120).

Since the plurality of flaw detection probes 110 are installed at regular intervals along the width direction (Y direction in FIG. 2) of the ultrasonic flaw detector 100, the probe probes 110 may be fixed along the width direction (Y direction in FIG. 2) of the reference specimen 200. Project ultrasound at intervals

That is, when the flaw probe 110 projects an ultrasonic wave having a sound velocity of the size set on the reference specimen 200, the projected ultrasonic wave is reflected from the surface, the artificial defect, and the bottom of the reference specimen 200, and reflected wave information Is received at the flaw probe 110.

The reflected wave information received by the flaw detection probe 110 is transmitted to the ultrasonic flaw detection control unit 300, and the ultrasonic flaw detection control unit 300 receives the reference specimen 200 through the reflection wave information of the surface, the artificial defect, and the bottom of the reference specimen 200. The flaw detection information is acquired (S130).

In addition, the ultrasonic flaw detection control unit 300 creates a flaw detection curve indicating flaw characteristics of the surface, artificial defects and bottom of the reference specimen 200 through the obtained flaw detection information of the reference specimen 200, and the reference specimen 200. The ultrasonic sound speed information projected on the data is stored (S140).

In addition, there is a specific ultrasonic sound velocity in which a flaw detection curve is created among the ultrasonic sound waves projected from the flaw detection probe 110, and the specific ultrasonic sound velocity may be searched as an experimental result by projecting ultrasonic sound velocity of various sizes.

That is, the ultrasonic sound velocity at which the flaw detection curves B1, B2, and B3 of the surface, artificial defects, and bottom of the reference specimen 200 are generated in relation to the reflected wave and the projection distance through the acquired flaw detection information of the reference specimen 200. The ultrasonic sound velocity is determined as the reference ultrasonic sound velocity (S141).

In addition, when the reference ultrasonic sound velocity is determined, a flaw detection curve of the reference specimen corresponding to the reference ultrasound sound velocity is generated and stored as a flaw detection curve corresponding to the alloy component (manganese content) and thickness of the reference specimen.

That is, the reference surface echo curve B1, the reference defect echo curve B2, and the reference bottom echo curve B3 are generated in the relationship between the reflected wave and the projection distance from the surface, artificial defect, and bottom of the reference specimen 200, respectively. The information is transmitted to the information storage and display unit 400 as file information.

The information storage and display unit 400 stores the file information and displays it on a monitor so as to be viewed from the outside (S143).

By repeating the above process, according to the alloy components (by manganese content), the thickness of the target material 10 to be ultrasonically examined, by the alloy components (by manganese content), thickness of the reference specimen 200 according to the thickness of the flaw detection characteristics A curve is created and stored in the information storage and display unit 400, respectively.

After the ultrasonic flaw detection of the reference specimen 200 is completed, that is, the creation and storage of the flaw detection curve is completed, the flaw detection material 10 desired for flaw detection is injected into the lower part of the ultrasonic flaw detector 100.

When the inspector 10 is input to the ultrasonic flaw detector 100, the alloying component (manganese content) and thickness information of the inspected inspector 10 to be input are input to the information storage and display unit 400. The received information is provided to the ultrasonic flaw detector 300 (S200).

The information storage and display unit 400 selects and uploads a flaw detection curve file of the reference specimen 200 corresponding to the alloy component (manganese content) and thickness information of the to-be-tested material 10 (S210).

The reference ultrasonic sound velocity determined in the reference ultrasonic sound velocity determination step (S141) is selected as the projected ultrasonic sound velocity of the target object 10 (S220).

For example, when the sample 10 has a manganese content of 10% by weight and a thickness of 20 mm, the ultrasonic sound speed is selected at 5300 m / s. When the sample 10 has a manganese content of 20% by a thickness of 40 mm, the ultrasonic sound velocity Can be selected as 5200m / s.

In addition, by using the flaw detection probe 110 of the flaw detector 100, the projected ultrasound sound velocity is projected to the flaw detector 10 from the front end face to the rear face of the flaw detector 10 introduced into the ultrasound flaw detector 100. FIG. Ultrasonic flaw detection may be performed by projecting (S230).

In addition, after the projected ultrasound reaches the to-be-detected material 10, it is reflected from the surface, the set height, and the bottom of the to-be-tested material 10, respectively, and the reflected reflected wave information is received by the flaw detection probe 110, respectively. .

The reflected wave information of the flaw detection material 10 received by the flaw detection probe 110 is transmitted to the ultrasonic flaw detection control unit 300, and the ultrasonic flaw detection control part 300 obtains flaw detection information of the flaw detection material 10 (S240). .

After acquiring the flaw detection information, the flaw detection information obtained at the flaw detection information acquisition step (S240) is compared with the flaw detection information obtained at the reference specimen flaw information storage step (S140). It is determined whether the flaw detection material 10 is defective (S300).

That is, the specimen surface echo curve (P1), the specimen height echo curve (P2), and the specimens are in relation to the projection ultrasonic sound velocity and the projection distance reflected from the surface, the set height, and the bottom surface of the specimen 10, respectively. A flaw detection material bottom echo curve P3 is created (S310).

The specimen surface echo curve P1, the specimen height echo curve P2, and the specimen bottom echo curve P3 thus created are uploaded from the information storage and display unit 400 to the reference surface echo curve ( B1), the reference defect echo curve B2, and the reference bottom echo curve B3 (S320).

Then, in the curve comparing step S320, when at least one or more bends are generated in the to-be-inspected material echo curve P2 or a waveform is formed out of the curve, it is determined as an internal defect of the to-be-inspected material 10.

Here, the defect length may be determined by the bending of the defect or the distance (mm) of the waveform in the X axis of FIG. 5.

The defect width may be determined as a distance between the flaw detection probes that flaw a defect of the flaw detection height echo curve P2 among the flaw detection probes 110 installed at regular intervals in the width direction in the ultrasonic flaw detection apparatus 100.

The defect height may be determined by the bending of the defect or the height of the waveform in dB in the Y axis of FIG. 5.

FIG. 6 is a schematic partial cutaway perspective view of a reference specimen of a first embodiment used in an ultrasonic scanning method according to an embodiment of the present invention, and FIG. 7 is a schematic bottom view of FIG. 6, wherein the reference specimen of the first embodiment is artificial. It is a figure which shows a defect position.

Since the reference specimen of the first embodiment used in the ultrasonic flaw detection method is the same as the details described in the ultrasonic flaw detection method according to an embodiment of the present invention except for the matters specifically described below, the detailed description thereof will be omitted.

The reference specimen 200 of the first embodiment used in the ultrasonic flaw detection method may be manufactured in a flat plate shape and formed by the same size and thickness as the flaw flaw according to the component content (manganese content) of the flaw flaw.

A plurality of flat bottom holes 201, 203, and 205 of artificial defects having a circular groove shape may be formed in the reference specimen 200.

The flat bottom holes 201, 203, and 205 of artificial defects are divided into large flat bottom holes 201, medium flat bottom holes 203, and small flat bottom holes 205 according to the height from the bottom of the reference specimen 200. Can be formed.

However, the present invention is not limited thereto, and may be formed by dividing it into three or less or three or more according to the necessity of artificial flaw detection.

The flat bottom holes 201, 203, and 205 of the artificial defect may have different diameters or the same shape depending on their height.

The flat bottom holes 201, 203, and 205 of the artificial defect may have a flat bottom surface by drill counter boring.

The large flat hole 205 of the artificial defect is formed along the four corners of the reference specimen 200. This is because the defects of the to-be-tested material (the actual thick plate) are mainly gathered toward the corners (upper surface, lower surface, side surface). It is to flaw.

As described above, the reason why the defects appear toward the edges is that the inclusions, impurities and the like are released in the energy dissipation direction from the to-be-tested material (actual thick plate).

In addition, a plurality of flat bottom holes 201, 203 of the artificial defects may be formed along the diagonal direction of the reference specimen 200, which is intended to detect all the flaw probes while minimizing the formation of artificial defects.

The reason why the puncture hole of the artificial defect is formed in the surface direction from the bottom of the reference specimen 200 is because the surface echo curve of the flaw detection characteristic curve is the surface reflection information. Is to make.

8 is a schematic cross-sectional view of the reference specimen of the second embodiment used in the ultrasonic scanning method according to an embodiment of the present invention, Figure 9 is a schematic bottom view of Figure 8, the reference specimen artificial defect position of the second embodiment The figure which shows.

10 is a schematic perspective view of a reference specimen of a second embodiment used in the ultrasonic flaw detection method according to an embodiment of the present invention.

The reference specimen of the second embodiment used in the ultrasonic flaw detection method is the same as the details described in the ultrasonic flaw detection method according to an embodiment of the present invention except for the matters specifically described below.

8 to 10, the reference specimen 200a of the second embodiment used in the ultrasonic flaw detection method is manufactured in a step shape and has the same size and thickness as that of the flaw flaw according to the component content (manganese content) of the flaw flaw. Stars may be formed.

The reason for manufacturing the reference specimen 200a in this manner is to reduce the reference specimen manufacturing cost by enabling inspection of various thicknesses with one reference specimen without making many reference specimens for each thickness.

The stepped reference specimen 200a may be formed with a plurality of steps 210 having a set width, thickness, and length, and the flat bottom holes 211 of artificial defects may be formed in the plurality of steps 210, respectively. have.

The area in which the plurality of step portions 210 are formed is equal to the size of the ultrasonic wave of each one probe when the plurality of flaw probes are arranged in the ultrasound flaw detector 100 for accurate flaw detection of the reference specimen. Or large, especially slightly larger.

The flat bottom holes 211 of the plurality of artificial defects of the stairs 210 may be formed in the same size or different sizes, respectively.

In addition, the stepped reference specimen 200a may form a flat plane portion 220 without forming a staircase, and a plurality of flat bottom holes 221 of artificial defects may be formed in the plane portion 220 at regular intervals, respectively. have.

The flat bottom holes 221 of the plurality of artificial defects of the flat part 220 may be formed in the same size or different sizes.

S100: Reference Specimen Preparation Step
S110: reference sample input step
S120: reference specimen ultrasonic phase
S130: acquiring reference specimen test information
S140: step of storing the specimen test information
S200: step of providing the information to be inspected
S210: Uploading the Standard Test Specimen Curve
S220: Projection Ultrasonic Sound Velocity Selection Step
S230: Ultrasonic flaw detection stage
S240: step of obtaining the flaw detection information
S300: defect determination step
S310: Creating a flaw detection curve
S320: Curve Comparison Step
100: ultrasonic flaw detection device
200: reference specimen
300: ultrasonic flaw detector
400: information storage and display unit

Claims (16)

A reference specimen ultrasonic flaw detection step of ultrasonic flaw detection by projecting an ultrasonic sound velocity set on a reference specimen having a plurality of artificial defects by using a flaw probe of an ultrasonic flaw detector;
After the ultrasonic wave reaches the reference specimen, the reflected wave information reflected from the surface of the reference specimen, the artificial defect and the opposing surface facing the surface of the reference specimen is received, and the flaw detection information of the reference specimen is obtained from the ultrasonic flaw detection controller. Acquiring the specimen test information acquisition step
A reference specimen inspection information storage step of storing a flaw detection curve representing the flaw detection characteristics of the surface of the reference specimen, the artificial defect and the opposing surface through the reference specimen flaw information, and storing the ultrasonic sound velocity information projected on the reference specimen;
After the ultrasonic flaw detection of the reference specimen is completed, the ultrasonic flaw detection step of projecting the ultrasonic wave by projecting ultrasonic sound velocity to the target flaw to the ultrasonic flaw detection using the flaw probe of the ultrasonic flaw detection device,
After the ultrasonic wave reaches the to-be-detected material, the reflected wave information reflected from the surface of the to-be-tested material, the set height and the opposite surface facing the surface of the to-be-tested material is received, and the flaw detection information of the to-be-tested material is detected by the said The flaw detection material flaw detection information acquisition step acquired by a control part, and
A defect determination step of determining whether the flaw is defective by comparing the flaw detection information acquired in the flaw detection information acquisition step with the flaw detection information obtained in the step of storing the flaw detection information.
Including,
In the step of storing the reference specimen flaw information, a reference surface echo curve, a reference defect echo curve, and a reference bottom echo curve are generated in relation to the reference ultrasonic sound velocity and the projection distance reflected from the surface of the reference specimen, the artificial defect, and the opposite surface, respectively. And storing a reference specimen flaw characteristic curve file for storing as a file in the information storage.
The defect determination step,
An object to produce an object surface echo curve, an object height echo curve, and an object bottom echo curve in relation to the projection ultrasonic sound velocity reflected from the surface, the set height, and the opposing surface, respectively, and the projection distance, respectively Rescanning curve creation step, and
A curve comparing step of comparing the specimen surface echo curve, the specimen height echo curve, and the specimen bottom echo curve with the reference surface echo curve, the reference defect echo curve, and the reference bottom echo curve That includes, ultrasonic flaw detection method. The method of claim 1,
Before the ultrasonic flaw detection step, comprising a reference specimen preparation step of preparing a reference specimen having the same alloying component and the same size and thickness as the target material to be ultrasonic flaw detection. The method of claim 2,
Between the reference specimen preparation step and the ultrasonic flaw detection step, the ultrasonic flaw detection method comprising the step of injecting the reference specimen in the lower direction of the ultrasonic flaw detection apparatus along the direction of the test specimen. delete The method of claim 1,
The storing of the reference specimen flaw detection information includes displaying a reference specimen flaw characteristic curve file for displaying the reference surface echo curve, the reference defect echo curve, and the reference bottom echo curve in a file on an information display unit. Flaw detection method. The method of claim 5,
When the input of the flaw detection material into the ultrasonic flaw detection device, the flaw detection material information providing step of providing the component information and thickness information of the flaw detection material from the information storage and display to the ultrasonic flaw detection control unit, ultrasonic flaw detection Way. The method of claim 6,
When the alloying component and thickness information of the test specimen are input to the information storage and display unit, the standard specimen flaw characteristic curve uploading selects and uploads a flaw characteristic curve file of the reference specimen corresponding to the alloy component and thickness information of the test specimen. Ultrasonic flaw detection method comprising the step. The method of claim 7, wherein
And a projection ultrasonic sound velocity selection step of selecting the reference ultrasonic sound velocity determined in the reference ultrasonic sound velocity determination step as the projection ultrasonic sound velocity of the target material after performing the reference specimen flaw characteristic curve uploading step. delete The method of claim 8,
And the reference surface echo curve, the reference defect echo curve, and the reference bottom echo curve are uploaded in the reference specimen flaw characteristic curve uploading step. The method of claim 10,
The curve comparing step is to determine the defect of the specimen, when at least one or more bends in the specimen height echo curve is generated or a waveform out of the curve is formed, the ultrasonic flaw detection method. The method according to any one of claims 1 to 3, 5 to 8, 10 and 11,
The reference specimen is provided with a plurality of flat holes of artificial defects in the form of circular grooves from opposite surfaces,
The flat bottom hole of the plurality of artificial defects is formed in a different height from the opposite surface of the reference specimen, the ultrasonic flaw detection method. The method of claim 12,
The flat bottom hole of the plurality of artificial defects are formed in a plurality along the four corners of the reference specimen or the diagonal of the reference specimen, the ultrasonic flaw detection method. The method according to any one of claims 1 to 3, 5 to 8, 10 and 11,
The reference specimen is manufactured in a step shape having a plurality of stepped portions formed in a set width, thickness, and length,
Ultrasonic flaw detection method is to form a flat bottom hole of the artificial defect in each of the plurality of steps. The method of claim 14,
The area in which the plurality of stepped portions are formed, when the plurality of flaw detection probes are arranged in the ultrasonic flaw detection apparatus, the ultrasonic flaw detection method is formed to be equal to or larger than the size of the portion of the ultrasonic wave of each one probe. The method according to any one of claims 1 to 3, 5 to 8, 10 and 11,
The flaw detection material is a high manganese steel thick plate, the ultrasonic flaw detection method.

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