JP2978708B2 - Composite angle beam probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bevel probe for use in ultrasonic testing of welds between steel plates and steel pipes.

[0002]

2. Description of the Related Art FIG. 5 shows a piping technique (P8, October 1990).
FIG. 1 is a diagram showing a structure of a conventional angle beam probe described in P. 1 to P87). In the figure, reference numerals 1a to 1f denote a plurality of transmitting / receiving vibrators, 2a to 2f wedges, 3 a sound absorbing material,
Reference numeral 4 denotes a test object, 5 denotes a boundary surface between the respective wedges 2a to 2f, 6 denotes an ultrasonic wave propagating in the test object, and 7 denotes an ultrasonic wave propagating in the wedge.

[0003] The conventional angle beam probe is a method of detecting and transmitting ultrasonic waves with the same transducers 1a to 1f, and the ultrasonic waves transmitted from one transducer 1b pass through a wedge 2b. The ultrasonic wave 6 reaches the surface of the test object 4 and is divided into an ultrasonic wave 6 propagating into the test object 4 on the surface of the test object 4 and an ultrasonic wave 7 reflected and transmitted again to the wedge 2b. The ultrasonic waves 7 propagating in the wedge 2b are reflected multiple times in the wedge 2b or propagate zigzag in the wedge 2b. On the other hand, the ultrasonic waves 6 propagating into the test body 4 are transmitted from the transducers 1a to 1b by making the arrangement interval of the transducers 1a to 1f narrower than a predetermined beam width.
, And a relatively uniform and wide beam characteristic corresponding to the number of arrangements can be obtained.

[0004]

Since the conventional angle beam probe transmits and receives ultrasonic waves by one search method, the wedge 2a
The ultrasonic wave 7 propagating in a zigzag manner in the area 2f is generated behind the surface echo to increase the dead zone, and the wedge 2
It is necessary to increase the length of the wedges 2a to 2f in order to make the position of the second multiple reflection wave generated in a to 2f appear behind the maximum measurement distance of the test piece 4, which causes a decrease in sensitivity and There was a problem that led to an increase in the size of the probe. In addition, there is a problem in that the reliability of the test result when used as an automatic flaw detector decreases because no vibrator for the acoustic coupling monitor is provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to reduce the level of generation of surface echo to reduce the dead zone, and the wedge length does not depend on the thickness of the test specimen. The purpose is to get.

[0006]

The compound angle beam probe according to the present invention has a transmission wedge and a reception wedge, and an acoustic wave is provided between the transmission wedge and the reception wedge. A shield plate is provided, and the plurality of transmitting transducers fixed to the transmitting wedge and the plurality of receiving transducers fixed to the receiving wedge are arranged in a zigzag manner.

[0007] Further, a connector is provided in one-to-one correspondence with the number of transducers so that each of the plurality of transmission transducers and the plurality of reception transducers can be individually transmitted and received.

Further, a transmission vibrator for monitoring acoustic coupling is provided in front of the transmission wedge.

[0009]

The composite angle beam probe constructed as described above has a transmission wedge and a reception wedge, and the transmission wedge and the reception wedge are acoustically separated by an acoustic shielding plate. Since the surface echo level can be reduced, the dead zone can be reduced, and multiple reflected waves of the wedge are not easily generated, so that the wedge length can be determined without being affected by the thickness of the test sample. Since it has a vibrator for an acoustic coupling monitor, high reliability in an automatic flaw detection test can be secured.

[0010]

【Example】

Embodiment 1 FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a top view, FIG. 3 is a side view, and FIG. 4 is an ultrasonic beam profile. In the figure, 8 is a transmission wedge, 9 is a reception wedge, 10a and 10b are transmission vibrators, 11a to 1
1c is a receiving transducer, 12 is an acoustic shielding plate, 13 is a transmitting transducer for acoustic coupling monitoring, 14a to 14f are connectors, and 15a to 15d are ultrasonic beam profiles.

In the composite type oblique probe configured as described above, the upper part of the transmitting wedge 8 is used to fix the plurality of transmitting transducers 10a and 10b to the surface of the test piece 4 at a predetermined angle. And has an integral structure with no boundary surface between the respective vibrators 10a and 10b. Therefore, no ultrasonic wave propagating zigzag in the wedge 8 is generated. The receiving wedge 9 has the same structure as the transmitting wedge, and has a plurality of receiving vibrators 11a to 1d.
The arrangement of 1c is arranged so as to be staggered with respect to the transmitting transducer. An acoustic shielding plate made of a cork material or the like is provided between the transmission wedge 8 and the reception wedge.

Also, in the composite type oblique probe constructed as described above, the connectors 14a to 14f for connecting the transducers 10a, 10b, 11a to 11c to the transceiver in a one-to-one correspondence. Is provided, it is possible to adjust with the transceiver even when there is a sensitivity difference between the respective transducers 10a, 10b, 11a to 11c, and uniform characteristics can be obtained as the ultrasonic beam profiles 15a to 15d. it can.

In the composite type oblique probe configured as described above, the receiving transducer 11a is provided in front of the transmitting wedge 8.
11c is provided with an acoustic coupling monitoring vibrator 13 at an angle opposite to 11c. Ultrasonic waves generated from the acoustic monitoring vibrator 13 bounce on the bottom surface of the test piece 4 and are received by any of the receiving vibrators 11a to 11c. Can be received at

[0014]

Since the present invention is configured as described above, it has the following effects.

Since the transmission wedge and the reception wedge are divided by an acoustic shielding plate and there is no boundary surface between the respective vibrators, the surface echo level can be reduced, and the wedge is unnecessary behind the surface echo. A probe with a small dead zone that does not generate any reflected waves can be configured.

The number of transmitting transducers and receiving transducers is one to one.
Therefore, it is possible to easily correct the sensitivity variation occurring in the probe alone, to make the sound pressure distribution of the ultrasonic beam profile uniform, and to improve the reproducibility of defect detection.

Since the oscillator for monitoring the acoustic coupling is provided, the reliability of the test result in the automatic flaw detection test can be ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a top view showing the embodiment of the present invention.

FIG. 3 is a side view showing an embodiment of the present invention.

FIG. 4 is an ultrasonic beam profile diagram according to the present invention.

FIG. 5 is a view showing a conventional angle beam probe.

[Explanation of symbols]

 Reference Signs List 8 wedge for transmission 9 wedge for reception 10 transducer for transmission 11 transducer for reception 12 acoustic shield plate 13 transducer for acoustic coupling monitor 14 connector 15 ultrasonic beam profile

Continuation of the front page (72) Inventor Yoji Tanaka 325 Kamimachiya, Kamakura-shi Kamakura Works, Mitsubishi Electric Corporation (58) Field surveyed (Int. Cl. ⁶ , DB name) G01N 29/00-29/28

Claims (3)

(57) [Claims] 1. An oblique probe for obliquely propagating a transverse wave in a test body, comprising: two or more transmitting oscillators;
A transmitting wedge for arranging the transmitting oscillator at a predetermined angle with respect to the surface of the test piece, and maintaining a constant interval between the plurality of transmitting oscillators, and a plurality of receiving wedges of three or more. A vibrator and the receiving vibrator are arranged at a predetermined angle with respect to the surface of the test sample, and the receiving vibrator is arranged in a staggered manner with the transmitting vibrator in the arrangement direction of the transmitting vibrator. A composite angle beam probe comprising a wedge and an acoustic shielding plate made of a cork material or the like provided on a boundary surface between the transmission wedge and the reception wedge. 2. The composite angle beam probe according to claim 1, wherein the transmitter and the receiver have a one-to-one correspondence with the number of transducers so that each of the transmission transducer and the reception transducer can be transmitted and received independently. Composite angle beam probe characterized by having a connector for connection with the probe. 3. The composite angle beam probe according to claim 1, wherein an ultrasonic wave is applied to one of the plurality of receiving transducers in front of the transmitting wedge even if the thickness of the test piece changes. A compound angle beam probe comprising an acoustic coupling monitor vibrator so that the probe always propagates through the specimen.