JPS6047957A - Ultrasonic flaw detection apparatus - Google Patents

Abstract

PURPOSE:To make it possible to accurately perform ultrasonic flaw detection from the inside of a pipe by the movement of a probe to the axial direction, by arranging plural sets of ultrasonic probe groups, each of which constituted by radially arranging a plurality of ultrasonic probes, so as to respectively arrange all of said probe groups to the circumferential direction in different phase difference. CONSTITUTION:Each of Two sets of probe groups 2, 3 inserted into a pipe 1 to be inspected form a set wherein four ultrasonic probes 4 are arranged so as to mutually provide a phase angle of 90 deg. and transmits an ultrasonic wave to the pipe 1 to be inspected through water 5. In this case, two sets of the probe groups 2, 3 each comprising four ultrasonic probes 4 are arranged to the circumferential direction so as to mutually form a phase angle of 45 deg. and both of them are connected by a cable 6 which is, in turn, connected to an ultrasonic flaw detector. When the probe groups 2, 3 are arranged as mentioned above and moved to the axial direction, ultrasonic waves are transmitted to the circumferential direction so as to form 45 deg.-angle intervals as the result of this arrangement. That is, the ultrasonic flaw detection of the pipe 1 to be inspected can be performed in such a state that the inner circumference of said pipe 1 is divided into twelve sections.

Description

[Detailed description of the invention] Concerning improvements to ultrasonic flaw detection equipment.

In order to perform ultrasonic flaw detection on relatively small-diameter pipes such as boiler steel pipes from the inner surface of the pipe, conventionally, one ultrasonic probe is rotated, or multiple ultrasonic probes are moved circumferentially. It is being considered to arrange them in However, there are problems with rotating the ultrasonic probe, such as miniaturization of the drive motor and interference with ultrasonic flaw detection due to noise generated by the motor, and the need to arrange multiple ultrasonic probes in the circumferential direction. However, due to the size limitations of the ultrasound probe. Because it is technically difficult to arrange a large number of them, there were problems such as the fact that ultrasonic waves could not be transmitted in the circumferential direction, which meant that there were some areas where ultrasonic flaw detection could not be performed.

The present invention is. In order to eliminate these drawbacks of conventional devices, we aim to provide an ultrasonic flaw detection device that can perform ultrasonic flaw detection over the entire circumference of a pipe.
In a device that performs ultrasonic flaw detection from the inner surface of an object, a group of ultrasonic probes are arranged radially at a fixed angle to the circumferential direction of the object.

A plurality of ultrasonic probes are arranged in the axial direction within the subject via cables, and all adjacent ultrasound probe groups are arranged with different phase differences in the circumferential direction. We propose an ultrasonic flaw detection device.

Therefore, in the ultrasonic flaw detection apparatus of the present invention, by arranging each probe as described above, ultrasonic waves can be generated all around the tube by moving the probe in the axial direction without rotating the probe. It is possible to perform flaw detection effectively and accurately from the inside of the tube.

An embodiment of the present invention will be described with reference to the drawings.

In the perspective view of FIG. 1 and the sectional view of FIG.

The two probe groups 2 and 3 inserted into the tube to be inspected 1 each consist of four ultrasonic probes 4 arranged at a phase angle of 90 degrees, and are exposed to water through water 5. Ultrasonic waves are transmitted to the test tube 1.

Two sets of probe groups 2 and 3 each consisting of four ultrasonic probes 4 are arranged in the circumferential direction with a phase angle of 45 to each other, and both are connected by a cable 6. is connected to an ultrasonic flaw detector (not shown).

When the probe groups 2 and 3 are arranged in this way and moved in the axial direction, the result is that ultrasonic waves are emitted at angles of 45 degrees with respect to the circumferential direction. . Furthermore, although not shown, when another probe group is arranged with the phase angle of the previous two probe groups 2, 3 and 225, ultrasonic waves are emitted in the circumferential direction with a phase angle of 2250. That is, the inner circumference of the tube 1 to be inspected is divided into 12 parts for ultrasonic flaw detection.

For relatively small-diameter pipes such as boiler steel pipes, considering the dimensions of the ultrasonic transducer, it is not possible to perform ultrasonic flaw detection over the entire circumference of the test pipe by dividing the circumference of the pipe into 12. This is almost the same as the actual value, and there is no problem in practical use. In addition, it provides a technology that allows ultrasonic flaw detection of tubes at a relatively low cost without the need for special measures such as rotating each probe 4, and is extremely useful for measuring the thickness of boiler steel pipes and detecting flaws. demonstrate.

[Brief explanation of drawings]

FIG. 1 is a shotgun diagram of an embodiment of the ultrasonic flaw detection apparatus of the present invention, and FIG. 2 is a sectional view taken along line II--II in FIG. 1. 1: Test tube, 2, 3: Probe group, 4: Probe, 6: Cable. 1M Figure 2, j 4

Claims (1)

[Claims] In an apparatus for ultrasonic flaw detection from the inner surface of a specimen, a plurality of ultrasonic probes are arranged radially at a constant angle with respect to the circumferential direction of the specimen, and a group of 7'c1 ultrasonic probes is used. A plurality of ultrasonic probes are arranged in the axial direction inside the subject via cables, and all adjacent ultrasonic probe groups are arranged with different phase differences in the circumferential direction. ? Ultrasonic flaw detection equipment.