JPH044220Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to an angle probe for ultrasonic flaw detection.
In particular, the present invention relates to an improvement in an angle probe for ultrasonic flaw detection, which is suitable for use in ultrasonic flaw detection of flaws in tubular materials to be inspected.

[Conventional technology]

Generally, when inspecting flaws etc. on a tubular material to be inspected using ultrasonic waves, defects in the tube axis direction (hereinafter referred to as L flaws) and defects in the tube circumferential direction (hereinafter referred to as T flaws) are detected. The oblique flaw detection and the vertical flaw detection for detecting so-called double-crack defects and measuring the tube thickness are carried out singly or in combination. Among these methods, when performing the above-mentioned oblique angle flaw detection, it is customary to arrange the probes as shown in FIGS. 1 and 2 for flaw detection. That is, FIG. 1 shows how the probes are arranged mainly for the purpose of detecting L flaws, and the probe 10
The ultrasonic beam 14 transmitted from the transducer 12 of
is configured to propagate in the circumferential direction X of the material 16 to be inspected. On the other hand, FIG. 2 shows how the probes are arranged mainly for the purpose of detecting T flaws, and the ultrasonic beam 14 transmitted from the transducer 12 of the probe 10 is The beam propagates in the tube axis direction Y. Generally, one of the characteristics of ultrasonic flaw detection is sharp directivity, so the ultrasonic beam 14
In L flaw detection, in which the ultrasonic beam 14 is propagated in the tube axis direction, the defect is almost parallel to the tube axis direction Y, and in T flaw detection, in which the ultrasonic beam 14 is propagated in the tube axis direction Y, the defect is almost parallel to the tube circumferential direction X. Each defect can be detected.

[Problem that the idea aims to solve]

However, among the natural defects that occur in the inspected material 16, there are many that are inclined to some extent with respect to the tube circumferential direction X or the tube axis direction Y. However, in the case of flaw detection equipment equipped with conventional probes,
There has been a problem in that it is extremely difficult to detect defects that are inclined to some extent with respect to the circumferential direction X or the tube axis direction Y due to the sharp directivity. To solve this problem, a large number of probes are arranged on the material to be inspected at equal pitches and shifted at angles, so that the incident direction of the ultrasonic beam emitted from the transducer of each probe is slightly shifted. By doing so, it is possible to ensure that even a defect that is tilted at a certain angle can be detected by the ultrasonic beam irradiated from one of the plurality of probes. However, arranging a large number of probes at equal intervals at different angles not only complicates the setup, but also makes the entire flaw detection device extremely large, which is unfavorable from an economical and maintenance standpoint. There is a problem with becoming. The present invention was developed in view of the above-mentioned conventional problems, and uses ultrasonic waves that can detect various defects such as L scratches, tilted scratches, and T scratches without arranging a large number of probes. The purpose of this invention is to provide an angle probe for flaw detection.

[Means to solve the problem]

The present invention provides an angle probe for ultrasonic flaw detection, including an ultrasonic propagating body having a conical surface or a part of a conical surface whose axis is perpendicular to the surface of the material to be inspected;
A plurality of ultrasonic beams are juxtaposed in the circumferential direction on the conical surface of the ultrasonic propagator, and the irradiation direction of each ultrasonic beam is directed toward a fixed point where the axis of the conical surface intersects with the surface of the material to be inspected. The above object has been achieved by including a vibrator.

[Effect]

In the present invention, a single probe is equipped with multiple transducers, and the ultrasonic beam from each transducer is directed at a specific point on the material to be inspected from multiple directions at the same incident angle. Therefore, it is possible to easily obtain ultrasonic beams that are incident on the inspected material from various directions without arranging a large number of probes.

【Example】

Embodiments of the present invention will be described in detail below based on the drawings. In this first embodiment, as shown in FIGS. 3 and 4, an ultrasonic propagation body (acoustic delay material) 20 is provided with a conical surface 22 such that an axis C is perpendicular to the surface of a material 16 to be inspected. are juxtaposed in the circumferential direction Z on the conical surface 22 of the ultrasonic propagation body 20, and the irradiation direction of each of the ultrasonic beams 28a to 28p (only 28e and 28m are shown) is aligned with the axis C of the conical surface 22. 16 vibrators 24a to 24p which are directed toward a fixed point P where the cross section intersects with the surface of the material 16 to be inspected. Therefore, the conical surface 22 of the ultrasonic propagator 20 allows the ultrasonic beams 28a to 28p transmitted from each of the transducers 24a to 24p to maintain a predetermined incident angle θi.
It is processed so that it can pass through the same fixed incident point P. Further, each of the vibrators 24a to 24p is arranged at equal intervals of 22.5° on this conical surface. Note that the configuration of each of the transducers 24a to 24p and the method for fixing the transducers 24a to 24p to the ultrasonic propagation body 20 are the same as conventional methods. Next, the operation of this first embodiment will be explained. Ultrasonic beam 28 from each transducer 24a to 24p
When transmitting a to 28p, each ultrasonic beam 28a
.about.28p pass through the same fixed incident point P, respectively. Since this fixed point P is provided on the axis C of the conical surface 22, each of the ultrasonic beams 28a to 28p
will pass through the fixed point P at the same angle of incidence θi. As a result, the ultrasonic beams 28a to 28p transmitted from the respective transducers 24a to 24p enter the tubular inspected material 16 at fixed incident angles θi. Therefore, by sequentially exciting the transducers 24a to 24p, the ultrasonic beams 28a to 28p are sequentially transmitted radially into the inspected material 16 centering on the fixed incident point P, and the L flaws and T flaws are eliminated. Of course,
Even if the defect has various inclinations with respect to the tube circumferential direction X or the tube axis direction Y, any ultrasonic beam 2
8a to 28p. Next, FIG. 5 and FIG. 6 show a second embodiment of the present invention. This second embodiment includes an ultrasonic propagator 30 having a part (1/4 in the illustrated example) of a conical surface, and a circumferential direction Z on (a part of) the conical surface 32 of the ultrasonic propagator 30.
and each ultrasonic beam 38a
- 38e (only 38e is shown) irradiation direction is directed toward a fixed point Q where an axis C passing through the center of the conical surface 32 intersects with the surface of the inspected material 16. It is something that In the figure, 40 is a sound absorbing material. Even in this embodiment, each vibrator 34a to 34
Ultrasonic beams 38a to 38e transmitted from e
pass through the same fixed point of incidence Q at the same angle of incidence θj, and by sequentially exciting the transducers 34a to 34e, the ultrasonic beams 38a to 38e radiate from the fixed point of incidence Q to the inspected material 16. It will be injected into the Therefore, the angle probe shown in this second embodiment is
4 pieces of inspected material 16 with their arrangement directions different by 90°
By arranging it on the top, not only L scratches and T scratches can be removed in the tube circumferential direction X or tube axial direction Y as in the first embodiment.
It is also possible to detect defects with various slopes. In the first and second embodiments, the vibrators 24a to 24p and 34a to 34e are arranged at equal pitches of 22.5 degrees, but depending on the quality required, it is not always necessary to arrange them at equal pitches. Alternatively, even if they are arranged at equal pitches, they may be arranged at other pitches, such as 45°, 30°, 18°, 15°, etc. Furthermore, in the first and second embodiments, the detectable range of one probe was set to 360° and 90°, respectively, but this could be changed to, for example, 180° or 120°.
You may also set it to . In this case,
If it is set to an appropriate divisor of 360°, a rational arrangement can be made when performing flaw detection in the entire circumferential direction in combination.

[Effects of the invention] As explained above, the present invention has the excellent effect of allowing ultrasonic beams to be incident on the inspected material from various directions just by attaching one probe. is obtained. As a result, it is possible to omit the process of arranging a large number of probes according to the number of incident directions, which not only saves time and effort for setting up, but also allows the flaw detection device itself to be miniaturized, which is economical and Good maintenance results can be obtained.

[Brief explanation of drawings]

Figures 1A and B are front and side views when performing ultrasonic flaw detection for L flaws using a conventional probe, and Figures 2A and B are for ultrasonic flaw detection for T flaws using a conventional probe. FIG. 3 is a plan view showing an embodiment of the bevel probe for ultrasonic flaw detection according to the present invention, and FIG.
The figure is a sectional view along the line of Fig. 3, and Fig. 5 is a sectional view taken along the line of Fig. 3.
A plan view corresponding to FIG. 3 showing a second embodiment of the present invention,
FIG. 6 is a sectional view taken along the - line in FIG. 5. 20, 30... Ultrasonic propagator, 22, 32...
Conical surface, 24a to 24p, 34a to 34e... Vibrator, 26, 36... Bottom surface, 28a to 28p, 3
8a to 38e...Ultrasonic beam, X...tube circumferential direction, Y...tube axial direction, C...cone axis.

Claims (1)

[Claims for Utility Model Registration] An ultrasonic propagator having a conical surface or a part of a conical surface whose axis is perpendicular to the surface of a material to be inspected; A plurality of transducers are arranged in parallel in the same direction, and the irradiation direction of each ultrasonic beam is directed toward a fixed point where the axis of the conical surface intersects with the surface of the material to be inspected. Angle angle probe for ultrasonic flaw detection.