JP2007212406A - Nondestructive inspection jig and ultrasonic nondestructive inspection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform nondestructive inspection on bend parts of small-diameter pipings in a short time. <P>SOLUTION: A piping fastening part 19 has a pair of mounting devices 17a and 17b connected to each other by a connecting part 16. The pair of mounting devices 17a and 17b are brought into contact with an outer circumferential surface of a piping over a bend part 12 of the piping and fastened to the piping by a fastening band 18. A probe holder holding part 22 holding a probe holder 21 to which a probe 20 is mounted is rotation-freely supported at a rotation supporting part 23 in a probe scanning part 24. The probe scanning part 24 rotates the probe holder holding part 22 in the longitudinal direction of the bend part 12 of the piping to slide the probe 20 in the longitudinal direction of an outer circumferential surface of the bend part 12 of the piping and make the probe 20 perform scanning. A binding part 25 binds the probe scanning part 24 and the piping fastening part 19 in such a way that the rotation supporting part 23 of the probe scanning part 24 may be located at a scanning fulcrum in the longitudinal direction of the bend part 12 of the piping. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a nondestructive inspection jig and an ultrasonic nondestructive inspection apparatus for mounting a probe and scanning the surface of an inspection object to inspect the inspection object from the outside.

  Piping such as a drain line of a power plant has a bend (bent portion) and changes the direction of the fluid flowing through the piping. The pipe bend easily undergoes internal thinning due to erosion / corrosion or the like, and when erosion / corrosion occurs and internal thinning proceeds, internal fluid may leak. Erosion-corrosion is a thinning phenomenon caused by the interaction between erosion due to mechanical action and corrosion due to chemical action, similar to corrosion fatigue. Erosion is a phenomenon in which a surface is mechanically damaged due to repeated collision of a fluid with a material, and a part of the surface is detached. Corrosion refers to all damage chemically received by erosion.

  In order to cope with such a thinning phenomenon caused by erosion / corrosion, thinning control is performed by measuring the wall thickness at a fixed point of the pipe using ultrasonic waves. It is difficult to obtain an accurate flaw detection result because of the curvature shape of the bend portion of the small diameter pipe. In particular, when the bend portion of the small-bore pipe is formed of a socket elbow, the socket elbow has a complicated external shape, and therefore, the fender is hardly flawed. In view of this, usually, the test result of the most recent straight pipe portion is substituted and the thickness reduction of the vent portion is evaluated.

Here, as a means for flaw detection at the elbow of the pipe bend, a trajectory is set on the pipe including the elbow, the moving body is moved along this trajectory, and the flaw detection arm is moved in a direction crossing the trajectory of the moving body. There is one which is arranged and attached so as to be rotatable in a plane perpendicular to the surface to be inspected (see Patent Document 1). This flaw detection apparatus obtains the distance of the probe with reference to the weld line between the straight pipe of the pipe and the elbow, and performs flaw detection while specifying the flaw detection position of the elbow.
JP-A 61-223510

  However, since the apparatus configuration is complicated and the position of the flaw detection arm must be measured in the one of Patent Document 1, it is difficult to flaw the bend portion of the small-diameter pipe, and the flaw detection work takes time. .

  For example, there are many small-diameter pipes in the radiation management area of a nuclear power plant, and it is necessary to manage the thinning of these small-diameter pipes. On the other hand, the measurement of the wall thickness of the pipe as a non-destructive inspection generally performs a so-called fixed point measurement in which a specific measurement point of the pipe is determined in advance and the wall thickness is measured at the measurement point. This is because the working time is shortened by narrowing down the measurement points of the nondestructive inspection. This fixed-point measurement is an inspection method based on the premise that the thickness of the pipe is uniformly reduced. However, this fixed-point measurement cannot cope with a local thinning.

  It is desirable to directly measure the wall thickness of the pipe bend because the pipe bend is more likely to be thin than the straight pipe. When performing non-destructive inspection of the bend part of a small-diameter pipe, the probe is pressed perpendicularly to the surface of the bend part, but the bend part of the small-diameter pipe has a large curvature. Is difficult to press properly against the bend surface. For this reason, transmission / reception of ultrasonic waves by the probe becomes unstable, and it is often difficult to obtain reproducible measurement data with a certain accuracy. Therefore, the thickness of the bend part of the pipe is not measured directly, and the thickness of the straight pipe part downstream of the bend part is measured to control the thinning of the bend part. .

  On the other hand, in the radiation control area of a nuclear power plant, it is necessary to reduce the radiation dose received by workers as much as possible. Therefore, the non-destructive flaw detection work for elbows of small-diameter pipes in the radiation control area can be performed efficiently and in a short time. Have to do.

  An object of the present invention is to provide a non-destructive inspection jig and an ultrasonic non-destructive tool capable of performing a non-destructive inspection with a high degree of accuracy in a short period of time, with ease and for a bend portion of a small diameter pipe. It is to provide a destructive inspection device.

  The nondestructive inspection jig according to the invention of claim 1 is a probe for mounting a probe and a pipe fixing part fixed to a pipe outer peripheral surface at two locations before and after the pipe bend part and fixed by a fixing member. A probe holder holding portion holding a holder is rotatably supported by a rotation support portion, and the probe holder holding portion is rotated in a longitudinal direction of a bend portion of the pipe so that the probe is connected to the pipe. A probe scanning section for sliding and scanning in the longitudinal direction of the outer peripheral surface of the bend section, and a rotation support section of the probe scanning section so as to be a scanning fulcrum position in the longitudinal direction of the bend section of the pipe A coupling unit that couples the probe scanning unit and the pipe fixing unit is provided.

  A nondestructive inspection jig according to a second aspect of the present invention is the probe of the first aspect, wherein the probe holder holding portion is capable of sliding and scanning the probe holder in the circumferential direction of the outer peripheral surface of the pipe. It is comprised so that the said probe holder may be hold | maintained so that it may become.

  A nondestructive inspection jig according to a third aspect of the invention is characterized in that, in the first or second aspect of the invention, a position detector for detecting a moving position of the probe is provided.

The nondestructive inspection jig according to the invention of claim 4 is the invention according to any one of claims 1 to 3, wherein the fixing member is a fixing band for fixing the pipe fixing portion to the outer peripheral surface of the pipe. The ultrasonic nondestructive inspection apparatus according to claim 5 is characterized in that an ultrasonic probe is mounted on the probe holder of the nondestructive inspection jig according to any one of claims 1 to 4. It is characterized by.

  According to the present invention, in the non-destructive inspection of the bend part of the pipe, the pipe fixing part is brought into contact with the outer peripheral surface of the pipe and fixed to the pipe with the fixing member, so that the pipe can be easily fixed to the bend part. Since the probe holder to which the probe is attached is held by the probe holder holding portion and the probe is slid and scanned in the longitudinal direction of the outer peripheral surface of the bend portion of the pipe, nondestructive inspection can be easily performed in a short time.

  In particular, it is possible to easily measure the local thinning of the back-side bent portion and the ventral-side bent portion of a small-bore pipe elbow (especially a socket elbow), which has been conventionally difficult to inspect, in a short time. Further, when the sliding position is detected in the longitudinal direction of the outer peripheral surface of the probe, the thickness information at each flaw detection position can be displayed as an image, so the extent and position of the thinning can be confirmed at a glance.

(First embodiment)
FIG. 1 is a configuration diagram when an ultrasonic nondestructive inspection apparatus in which an ultrasonic probe is mounted on the nondestructive inspection jig according to the first embodiment is applied to a socket elbow, and FIG. 2 is an inspection for nondestructive inspection. FIG. 3 is a structural view of a socket elbow as a target, FIG. 3 is an arrow view seen from the direction of arrow A1 in FIG. 1, and FIG. 4 is an arrow view seen from the direction of arrow B1 in FIG.

  In FIG. 2, it is assumed that the inspection object of the nondestructive inspection in the first embodiment is the socket elbow 11 and the inspection object part is the back side of the socket elbow 11. The socket elbow 11 has a bend portion 12 for changing the flow direction of fluid and a socket portion 13 for connecting to other piping, and the socket portion 13 and the straight pipe portion 14 of other piping are connected by a welded portion 30. Is done. Then, the back side of the bend portion 12 of the socket elbow 11 becomes an inspection target portion, and a probe described later is scanned in the longitudinal direction (arrow S1 direction) on the back side of the bend portion 12 to perform nondestructive inspection. Further, as shown in FIG. 4, a non-destructive inspection is performed by scanning a probe described later in the circumferential direction (arrow S2 direction) of the outer peripheral surface of the bend portion 12.

  As shown in FIG. 1, a nondestructive inspection jig 15 is attached to the outer periphery of the socket elbow 11. The nondestructive inspection jig 15 is a probe with respect to the outer peripheral surface of the pipe fixing portion 19 for fixing to the outer peripheral surface of the socket portion 13 of the socket elbow 11 and the bend portion 12 of the socket elbow 11 which is the inspection target portion. 20 includes a probe scanning unit 24 for scanning 20, and a coupling unit 25 that couples the pipe fixing unit 19 and the probe scanning unit 24.

  The pipe fixing part 19 includes a pair of attachments 17a and 17b that contact the outer peripheral surface of the socket part 13 of the socket elbow 11, a connecting part 16 that connects the pair of attachments 17a and 17b, and a pair of attachments 17a, It is comprised from the fixing member 18 which fixes 17b to piping. That is, the pair of fixtures 17 a and 17 b that are connected to each other by the connecting portion 16 across the bend portion 12 are brought into contact with the outer peripheral surface of the socket portion 13 of the socket elbow 11, and the pair of fixtures 17 a and 17 b are fixed to the fixing member 18. To the socket part 13 of the socket elbow 11. Although FIG. 1 shows a case where a fixing band is used as the fixing member 18, the pair of attachments 17 a and 17 b may be fixed with screws as the fixing member 18.

  The probe scanning unit 24 holds the probe holder 21 for mounting the probe 20 that slides on the outer surface of the bend portion 12 of the socket elbow 11 that is the inspection target part, and the probe holder 21. The probe holder holding part 22 to be rotated and the rotation support part 23 for turning the probe holder holding part 22 are configured.

  The probe scanning unit 24 holds a probe holder 21 for mounting the probe 20 with a probe holder holding unit 22, and rotates the probe holder holding unit 22 with a rotation support unit 23. Support freely. Then, the probe holder holding portion 22 is rotated in the longitudinal direction on the back side of the bend portion 12 (arrow S1 direction), so that the probe 20 is in the longitudinal direction on the back side outer peripheral surface of the bend portion 12 (arrow S1 direction). To slide scan.

  The coupling unit 25 couples the probe scanning unit 24 and the pipe fixing unit 19 so that the rotation support unit 23 of the probe scanning unit 24 is located at the scanning fulcrum position in the longitudinal direction of the bend unit 12. The coupling unit 25 is provided with a rotation position detector 26 that detects the rotation position of the probe holder holding unit 22 of the probe scanning unit 24, and the probe detected by the rotation position detector 26. The rotation position of the child holder holding part 22 is input to the measuring device 27. In addition, a measurement signal measured by the probe 20 is also input to the measuring device 27. The measuring device 27 stores the flaw detection image data to be inspected in association with the rotational position of the probe holder holding unit 22 detected by the rotational position detector 26.

  Since the rotation position of the probe holder holding part 22 is the position of the probe 20 on the outer surface of the vent part 12 of the socket elbow 11 to be inspected, the flaw detection image data to be inspected is the inspection target data. It is expressed as a measurement signal measured by the probe 20 corresponding to each part. Then, it is displayed on the display unit as necessary. Accordingly, since the flaw detection image displayed on the display unit displays the measurement signal measured by the probe 20 corresponding to the flaw detection position, the extent and position of the thinning can be confirmed at a glance.

  Next, as shown in FIG. 3, the probe holder holding portion 22 is formed in a fan shape, and is guided by the guide hole 28 of the fan shape portion so that the probe holder 21 is the outer periphery of the bend portion 12 of the socket elbow 11. Sliding scanning is performed in the circumferential direction of the surface (arrow S2 direction). In this case, although not shown in the figure, a sliding position detector for detecting the sliding position of the probe holder 21 is provided, and the sliding position is input to the measuring device 27 to correspond to the sliding position. The flaw detection image data to be inspected is stored.

  As described above, the position in the circumferential direction (arrow S2 direction) of the outer peripheral surface of the bend portion 12 of the socket elbow 11 is changed to probe in the longitudinal direction (arrow S1 direction) on the back side of the bend portion 12 of the socket elbow 11. Since the child holder holding part 22 can be slid, a nondestructive inspection can be performed on almost the entire region of the bend part 12 of the socket elbow 11.

  FIG. 5 is a cross-sectional view showing a state in which the bend portion 12 on the back side of the socket elbow 11 is not defective, and FIG. It is a data diagram of image data. As shown in FIG. 5, the probe holder holding portion 22 is rotated in the arrow S1 direction from the 0 ° position on the back side of the bend portion 12 of the socket elbow 11 to the 90 ° position. The probe 20 held by the probe holder 21 of the probe holder holding part 22 is bent by the bending part 12 of the socket elbow 11 from the 0 ° position to the 90 ° position as the probe holder holding part 22 rotates. Slide on the outer surface of the back side. The measuring device 27 is measured by the probe 20 as shown in FIG. 6 in association with the rotation position of the probe holder holding portion 22 detected by the rotation position detector 26 of the rotation support portion 23. The measured data is stored as flaw detection image data to be inspected.

  A curve L1 in FIG. 6 is a characteristic curve showing the thickness h of the bend portion 12 at each rotation position (0 ° position to 90 ° position) of the probe holder holding portion 22. The thickness of the bend portion 12 is h1 at the 0 ° position, the thickness h is h2 at the 45 ° position, and the thickness h is h3 at the 90 ° position. As described above, when the bend portion 12 on the back side of the socket elbow 11 is healthy, the thickness of the center portion of the bend portion 12 is the thickest and the thickness h gradually decreases toward both ends. A characteristic curve of the thickness h of the bend portion 12 along the original shape is obtained.

  Next, FIG. 7 is a cross-sectional view showing a state in which the central portion of the bend portion 12 on the back side of the socket elbow 11 is defective, and FIG. 8 is a variable of the rotational position of the probe holder holding portion at the cross-sectional position of FIG. Is a data diagram of flaw detection image data to be inspected. As shown in FIG. 7, consider a case where there is a defective portion 31 at the center of the bend portion 12. That is, consider a case where there is a defective portion 31 with an internal thickness between the rotation angles θ1 and θ2. When the probe holder holding portion 22 is rotated in the arrow S1 direction from the 0 ° position on the back side of the bend portion 12 of the socket elbow 11 to the 90 ° position with respect to the socket elbow 11 having the defective portion 31, A characteristic curve L2 indicating the thickness h of the bend portion 12 as shown in FIG. 8 is obtained. That is, as shown in FIG. 8, the thickness h of the bend portion 12 is the thinnest in the vicinity of the 45 ° position, and the thickness h gradually decreases in the θ1 direction and the θ2 direction around the 45 ° position. A characteristic curve L2 is obtained.

  As described above, since the measurement data measured by the probe 20 is stored in association with the flaw detection position of the probe holder holding unit 22 as flaw detection image data to be inspected, the flaw detection image ensuring reproducibility can be used at a glance. We can confirm thinning. That is, flaw detection can be performed easily and in a short time.

  According to the first embodiment, the pair of fixtures 17 a and 17 b are brought into contact with the outer peripheral surface of the socket portion 13 of the socket elbow 11 and fixed to the socket portion 13 by the fixing member 18. Can be easily fixed to The probe holder 21 to which the probe 20 is attached is held by the probe holder holding portion 22, and the coupling portion 25 is such that the rotation support portion 23 of the probe scanning portion 24 is in the longitudinal direction of the bend portion 12. Since the probe scanning unit 24 and the pipe fixing unit 19 are coupled so as to be the scanning fulcrum position, the probe 20 can be inspected only by sliding and scanning the probe 20 in the longitudinal direction of the outer peripheral surface of the bend unit 12. A nondestructive inspection of the bend unit 12 can be performed. Therefore, nondestructive inspection can be easily performed in a short time.

  Further, the probe holder holding portion 22 can hold the probe holder 21 so that the probe holder 21 can be slidably scanned in the circumferential direction of the outer peripheral surface of the bend portion 12. Nondestructive inspection can be performed on almost the entire region of the portion 12.

(Second Embodiment)
FIG. 9 shows an ultrasonic nondestructive inspection apparatus in which an ultrasonic probe is mounted on the nondestructive inspection jig according to the second embodiment, applied to a BWL (Butt-Welding Type) elbow (butt welding type elbow). FIG. 10 is a structural diagram of a BWL-type elbow that is an inspection object for nondestructive inspection, FIG. 11 is an arrow view seen from the direction of arrow A2 in FIG. 9, and FIG. 12 is a view seen from the direction of arrow B2 in FIG. FIG. In FIG. 9 and FIG. 11, the description of the measuring device 27 is omitted.

  In FIG. 10, the inspection target of the nondestructive inspection in the second embodiment is a BWL-type elbow 29, and the inspection target site is the back side of the bend portion 12 of the BWL-type elbow 29. The BWL-type elbow 29 connects the bend portion 12 that changes the flow direction of the fluid and the straight pipe portion 14 of another pipe by a welded portion 30, and the back side of the bend portion 12 of the BWL-type elbow 29 is a site to be inspected. The probe is scanned in the longitudinal direction (arrow S1 direction) on the back side of the bend portion 12 to perform nondestructive inspection. Further, as shown in FIG. 12, a non-destructive inspection is performed by scanning the probe also in the circumferential direction (arrow S2 direction) of the outer peripheral surface of the bend portion 12.

  This second embodiment is different from the first embodiment shown in FIG. 1 in that the non-destructive inspection jig 15 is mounted on the outer periphery of the BWL type elbow 29 when the socket 13 of the socket elbow 11 is attached. Instead, as shown in FIG. 9, a pair of fixtures 17 a and 17 b are attached to the straight pipe portion 14 of another pipe connected to the BWL-type elbow 29. The same elements as those in FIG.

  In FIG. 9, as in the first embodiment, the nondestructive inspection jig 15 includes a pipe fixing portion 19 for fixing the nondestructive inspection jig 15 to the outer peripheral surface of the pipe, and a BWL that is a part to be inspected. A probe scanning unit 24 for scanning the probe 20 on the outer peripheral surface of the bend unit 12 of the mold elbow 29, and a coupling unit 25 for coupling the pipe fixing unit 19 and the probe scanning unit 24 to each other. Composed.

  The pipe fixing portion 19 includes a pair of fixtures 17a and 17b that contact the outer peripheral surface of the straight pipe portion 14 of another pipe, a connecting portion 16 that couples the pair of fixtures 17a and 17b, and a pair of fixtures 17a. , 17b and fixing members 18a, 18b for fixing to the straight pipe portion 14 of other piping. The fixing members 18a and 18b are provided on the pair of fixtures 17a and 17b, respectively. That is, a pair of fixtures 17a and 17b that are connected to each other by the connecting portion 16 across the bend portion 12 of the pipe are brought into contact with the outer peripheral surface of the pipe, and the pair of fixtures 17a and 17b are piped by the fixing members 18a and 18b. To fix. Although FIG. 9 shows a case where a fixing band is used as the fixing member 18, the pair of attachments 17 a and 17 b may be stopped with screws as the fixing member 18.

  The probe scanning unit 24 includes a probe holder 21 for mounting the probe 20 that slides on the outer surface of the pipe bend 12 that is the inspection target part, and a probe that holds the probe holder 21. The probe holder holding unit 22 and a rotation support unit 23 for rotating the probe holder holding unit 22 are configured.

  The probe scanning unit 24 holds a probe holder 21 for mounting the probe 20 with a probe holder holding unit 22, and rotates the probe holder holding unit 22 with a rotation support unit 23. Support freely. Then, the probe holder holding portion 22 is rotated in the longitudinal direction (arrow S1 direction) on the back side of the bend portion 12 of the BWL-type elbow 29, so that the probe 20 is outer peripheral surface of the bend portion 12 of the BWL-type elbow 29. Slide and scan in the longitudinal direction (arrow S1 direction). The coupling unit 25 couples the probe scanning unit 24 and the pipe fixing unit 19 so that the rotation support unit 23 of the probe scanning unit 24 is located at the scanning fulcrum position in the longitudinal direction of the bend unit 12. Although the description of the measuring device 27 is omitted in FIG. 9, the measuring device 27 is measured by the rotation position of the probe holder holding portion 22 detected by the rotation position detector 26 and the probe 20. A measurement signal is input, and flaw detection image data to be inspected is stored in association with the rotational position of the probe holder holding portion detected by the rotational position detector 26.

  Next, as shown in FIG. 11, the probe holder holding portion 22 is formed in a fan shape in the same manner as in the first embodiment shown in FIG. 3, and is guided by the guide hole 28 of the fan portion. The probe holder 21 is slidably scanned in the circumferential direction (arrow S2 direction) of the outer peripheral surface of the bend 12 of the BWL elbow 29. In this case, although not shown in the figure, a sliding position detector for detecting the sliding position of the probe holder 21 is provided, and the sliding position is input to the measuring device 27 to correspond to the sliding position. The flaw detection image data to be inspected is stored.

  In this way, the position in the circumferential direction (arrow S2 direction) of the outer peripheral surface of the bend portion 12 of the BWL-type elbow 29 is changed, and the longitudinal direction (arrow S1 direction) on the back side of the bend portion 12 of the BWL-type elbow 29 is changed. Since the probe holder holding portion 22 can be slid, a nondestructive inspection can be performed on almost the entire region of the bend portion 12 of the BWL-type elbow 29.

  According to the second embodiment, similarly to the first embodiment, the nondestructive inspection can be easily performed in a short time for the bend portion 12 of the BWL type elbow 29. Further, the probe holder holding part 22 can hold the probe holder 21 so that the probe holder 21 can be slidably scanned in the circumferential direction of the outer peripheral surface of the bend part 12. Nondestructive inspection can be performed on almost the entire area of the bend portion 12.

(Third embodiment)
FIG. 13 shows an ultrasonic nondestructive inspection apparatus in which an ultrasonic probe is mounted on the nondestructive inspection jig according to the third embodiment is applied to a BWL (Butt-Welding Type) type elbow (butt welding type elbow). 14 is a structural diagram of a BWL-type elbow that is an inspection object of nondestructive inspection, FIG. 15 is an arrow view as viewed from the direction of arrow A3 in FIG. 13, and FIG. 16 is a view from the direction of arrow B3 in FIG. FIG. In addition, description of the measuring device 27 is abbreviate | omitted in FIG. 13, FIG.

  In FIG. 14, the inspection target of the nondestructive inspection in the third embodiment is a BWL-type elbow 29, and the inspection target site is the ventral side of the BWL-type elbow 29. The BWL-type elbow 29 connects the bend portion 12 that changes the flow direction of the fluid and the straight pipe portion 14 of another pipe by the welded portion 30, and the abdomen side of the bend portion 12 of the BWL-type elbow 29 is a site to be inspected. The probe is scanned in the longitudinal direction (arrow S11 direction) on the ventral side of the bend portion 12 to perform nondestructive inspection. Further, as shown in FIG. 16, a non-destructive inspection is performed by scanning the probe also in the circumferential direction (direction of arrow S21) of the outer peripheral surface of the bend portion 12.

  This third embodiment is a non-destructive inspection for the abdominal side instead of the back side of the bend portion 12 of the BWL type elbow 29 with respect to the second embodiment shown in FIG. The nondestructive inspection jig 15 is attached to the abdominal side outer peripheral portion of the BWL type elbow 29 instead of the back side outer peripheral portion of the BWL type elbow 29. The same elements as those in FIG. 9 are denoted by the same reference numerals, and redundant descriptions are omitted.

  In FIG. 13, the nondestructive inspection jig 15 includes a pipe fixing portion 19 for fixing the nondestructive inspection jig 15 to the outer peripheral surface of the pipe, and a bend portion 12 of a BWL-type elbow 29 that is an inspection target portion. A probe scanning unit 24 for scanning the probe 20 with respect to the outer peripheral surface of the ventral side, and a coupling unit 25 for coupling the pipe fixing unit 19 and the probe scanning unit 24 are configured.

  The non-destructive inspection jig 15 is attached to the outer peripheral portion of the BWL-type elbow 29 by connecting the pair of fixtures 17a and 17b of the pipe fixing portion 19 connected by the connecting portion 16 to the straight pipe portion 14 of another pipe. Abutting on the outer peripheral surface, the fixing members 18a and 18b are spanned and fixed.

  The probe holder holding part 22 of the probe scanning part 24 is supported by the coupling part 25 by the rotation support part 23 and is arranged on the ventral side of the bend part 12 of the BWL type elbow 29. Then, the probe holder holding portion 22 is rotated in the longitudinal direction (arrow S11 direction) on the ventral side of the bend portion 12 of the BWL-type elbow 29, and the probe 20 is moved to the outer periphery of the bend portion 12 of the BWL-type elbow 29. Sliding scanning is performed in the surface longitudinal direction (arrow S11 direction). Although illustration of the measuring device 27 and the rotational position detector 26 is omitted in FIG. 13, the measuring device 27 includes a probe detected by the rotational position detector 26 attached to the rotational support portion 23. The rotational position of the probe holder holding part 22 and the measurement signal measured by the probe 20 are input.

  Next, as shown in FIG. 15, the probe holder holding portion 22 is formed in a fan shape like the second embodiment shown in FIG. 11, and the probe holder 21 is a probe holder holding portion. Guided by the guide holes 28 of the fan-shaped portion 22, the BWL-type elbow 29 is slidably scanned in the circumferential direction (direction of arrow S 21 in FIG. 16) of the ventral outer peripheral surface of the bend portion 12. In this case, although not shown in the figure, a sliding position detector for detecting the sliding position of the probe holder 21 is provided, and the sliding position is input to the measuring device 27 to correspond to the sliding position. The flaw detection image data to be inspected is stored.

  In this way, by changing the position in the circumferential direction (arrow S21 direction) of the ventral outer peripheral surface of the bend portion 12 of the BWL elbow 29, the longitudinal direction (arrow S11 direction) of the bend portion 12 of the BWL elbow 29 is changed. ), The probe holder holding portion 22 can be slid, so that the non-destructive inspection can be performed on almost the entire area of the bend portion 12 of the BWL-type elbow 29.

  In the third embodiment, the probe holder holding portion 22 is slid in the longitudinal direction (arrow S11 direction) on the ventral side of the bend portion 12 of the BWL-type elbow 29, so that the probe having a sharp tip is provided. 20 is desirable.

  According to the third embodiment, the nondestructive inspection can be easily performed in a short time not only on the back side of the bend portion 12 of the BWL-type elbow 29 but also on the abdominal side. Further, the probe holder holding portion 22 can hold the probe holder 21 so that the probe holder 21 can be slidably scanned in the circumferential direction of the outer peripheral surface of the bend portion 12. Similar to the configuration, the nondestructive inspection can be performed on almost the entire region of the bend portion 12 of the BWL type elbow 29.

The block diagram at the time of applying the ultrasonic nondestructive inspection apparatus which attached the ultrasonic probe to the nondestructive inspection jig concerning the 1st Embodiment of this invention to a socket elbow. The structure figure of the socket elbow which is a test object of the nondestructive inspection in the 1st Embodiment of this invention. The arrow line view seen from arrow A1 direction of FIG. The arrow view seen from the arrow B1 direction of FIG. Sectional drawing of a state with no defect in the back | end bend part of the socket elbow which is a test object of the nondestructive inspection in the 1st Embodiment of this invention. FIG. 6 is a data diagram of flaw detection image data to be inspected with the rotation position of the probe holder holding portion at the cross-sectional position in FIG. 5 as a variable. Sectional drawing of the state which has a defect in the center part of the bend part of the back side of the socket elbow which is the test object of the nondestructive inspection in the 1st Embodiment of this invention. The data figure of the flaw detection image data of the test object which makes the rotation position of the probe holder holding | maintenance part in the cross-sectional position of FIG. 7 a variable. The block diagram at the time of applying the ultrasonic nondestructive inspection apparatus which attached the ultrasonic probe to the nondestructive inspection jig concerning the 2nd Embodiment of this invention to a BWL type elbow. The structure figure of the BWL type elbow which is the inspection object of the nondestructive inspection in the 2nd Embodiment of this invention. The arrow line view seen from the arrow A2 direction of FIG. The arrow line view seen from the arrow B2 direction of FIG. The block diagram at the time of applying the ultrasonic nondestructive inspection apparatus which attached the ultrasonic probe to the nondestructive inspection jig concerning the 3rd Embodiment of this invention to a BWL type elbow. The structure figure of the BWL type elbow which is the inspection object of the nondestructive inspection in the 3rd Embodiment of this invention. FIG. 14 is an arrow view seen from the direction of arrow A3 in FIG. 13. The arrow view seen from the arrow B3 direction of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Socket elbow, 12 ... Bend part, 13 ... Socket part, 14 ... Straight pipe part, 15 ... Nondestructive inspection jig, 16 ... Connection part, 17 ... Fixture, 18 ... Fixing band, 19 ... Pipe fixing part, DESCRIPTION OF SYMBOLS 20 ... Probe, 21 ... Probe holder, 22 ... Probe holder holding part, 23 ... Rotation support part, 24 ... Probe scanning part, 25 ... Coupling part, 26 ... Rotation position detector, 27 ... Measuring device, 28 ... Guide hole, 29 ... BWL type elbow, 30 ... Welded part, 31 ... Defect site

Claims (5)

A pipe fixing part that is in contact with the outer peripheral surface of the pipe at two places before and after the pipe bend part and fixed by a fixing member;
A probe holder holding portion holding a probe holder to which the probe is mounted is rotatably supported by a rotation support portion, and the probe holder holding portion is rotated in the longitudinal direction of the bend portion of the pipe. A probe scanning unit for slidingly scanning the probe in the longitudinal direction of the outer peripheral surface of the bend of the pipe;
A coupling unit that couples the probe scanning unit and the pipe fixing unit such that the rotation support unit of the probe scanning unit is a scanning fulcrum position in the longitudinal direction of the bend unit of the pipe;
A nondestructive inspection jig characterized by comprising:   The probe holder holding portion is configured to hold the probe holder so that the probe holder can slide and scan in the circumferential direction of the outer peripheral surface of the pipe. The nondestructive inspection jig according to claim 1.   The nondestructive inspection jig according to claim 1, further comprising a position detector that detects a moving position of the probe.   The non-destructive inspection jig according to claim 1, wherein the fixing member is a fixing band that fixes the pipe fixing portion to an outer peripheral surface of the pipe. An ultrasonic nondestructive inspection apparatus, wherein an ultrasonic probe is mounted on the probe holder of the nondestructive inspection jig according to claim 1.

Images