JPS61292053A - Ultrasonic flaw detecting method - Google Patents

Abstract

PURPOSE:To performs the automatic flaw detection of an object part in its thickness direction easily with high precision without moving a probe by using a composite type probe and transmitting and receiving an ultrasonic wave on electronic time-division basis. CONSTITUTION:The composite ultrasonic wave transmitting probe 5 which has vibrators 3-3''' arrayed on one side of the weld zone 2 of an extremely thick plate 1 and the composite type ultrasonic wave receiving probe 7 which has vibrators 6-6''' arrayed are arranged. Further, the probe 5 and receiver 7 move along the weld zone synchronously. A channel selector 8 sets the ultrasonic wave generation order and operation time of the respective vibrators 3-3''' by dividing the time electronically and when an ultrasonic wave is sent in order from the vibrator 3, it is received by the vibrator 6''' of the rear receiving probe 7 and inputted to the channel selector 8. The input signal is inputted as a waveform signal to an ultrasonic flaw detector 10 and displayed as a waveform of one thickness-directional scan.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an ultrasonic flaw detection method for welds, etc., using a composite oblique ultrasonic probe.

[Prior art] As shown in Fig. 3, an ultrasonic transmitter a and an ultrasonic receiver S, both of which have a constant input angle, are arranged in tandem on one side of the weld C, and the 6 The ultrasonic transmitter a and the receiver are moved to inspect the weld C in the thickness direction to detect weld defects.

[Problems to be Solved by the Invention] However, the operation of moving the ultrasonic transceivers a and b while transmitting and receiving them is difficult and requires skill, so the reliability of the test results is somewhat lacking.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides a composite ultrasonic transmitting probe in which a plurality of transducers having a predetermined input angle are arranged at a predetermined interval. A probe and a composite ultrasonic reception probe in which multiple receivers are arranged at required intervals,
Each transducer and each receiver are arranged in a straight line on one side of the part to be tested, and ultrasonic waves are sequentially transmitted from the plurality of transducers and received by the corresponding receivers to measure the thickness of the part to be tested. The flaws are now detected in the direction.

1 action] Ultrasonic waves are injected into the part to be inspected such as a welded part from one transducer of the composite ultrasonic transmitting probe, and are reflected by the corresponding receiver of the composite layer acoustic wave receiving probe. , the refracted ultrasonic waves are received, and the ultrasonic wave passage section is inspected for flaws.

Next, ultrasonic waves are input from the adjacent transducer and received by the corresponding receiver. When ultrasonic waves are sequentially applied from adjacent transducers and received by the corresponding receivers, the part to be tested is tested for flaws in the thickness direction.

Therefore, ultrasonic flaw detection can be performed automatically and with high precision without moving the ultrasonic probe.

"Example] Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a very thick plate 1
On one side of the butt welded part 20, there is a composite ultrasonic transmitter in which a plurality of transducers 3.3', 3'', 3'' of the same type having a predetermined input angle are arranged in a case 4 at required intervals. The contactor 5 is arranged so that the arrangement direction of each vibrator is perpendicular to the welding line direction, and the same type of vibrators 6.6', 6'',
A plurality of composite ultrasonic wave receiving probes 7 arranged in the same manner as the transmitting probes 5 are placed in the composite ultrasonic transmitter 5 so that each transducer 3 and 6 are positioned in a straight line. anti-weld part 2
It is placed on the side.

Further, the pair of composite ultrasonic transmitting probe 5 and receiver 7 can be moved synchronously along the welding part 2.

In channel selector 8, each transducer 3.3'
, 3'', 3''' ultrasonic generation order and operation time are set by electronic time division, and the flaw detection cable 9
When ultrasonic waves are injected in order from the transducer 3 via the
', and the signal is input to the channel selector 8 via the flaw detection cable 9.

The signals sequentially input to the channel selector 8 are output as waveform signals to the ultrasonic flaw detector 10, and displayed on the ultrasonic flaw detector 10 as a waveform for one scan in the thickness direction. A gate analog output signal is outputted from the ultrasonic flaw detector 10 to a pen oscilloscope 11 and recorded.

When the recording for the thickness direction scan is completed, a movement pulse signal is output from the pen oscillograph 11 to the operation controller 12, and a motor drive signal is sent from the operation controller 12 to the drive device, and the drive device moves the pair of The composite ultrasonic transmitting probe 5 and the receiving probe 7 are moved a predetermined distance.

Again, ultrasonic waves are applied in order from the vibrator 3 to the vibrator 3'' and scanned in the thickness direction in the same manner as above.

In this way, ultrasonic flaw detection is performed over the entire length of the butt weld 2 of the extremely thick plate 1.

It should be noted that the ultrasonic flaw detection method of the present invention is not limited to the above-mentioned embodiments, and the number of transducers may be a plurality and can be determined as appropriate depending on the thickness of the part to be tested. Of course, various changes can be made without departing from the gist of the present invention, such as the order in which the signals are transmitted can be determined arbitrarily, and the method can also be used for flaw detection of stress concentration parts other than welded parts.

[Effects of the Invention] As explained above, according to the ultrasonic flaw detection method of the present invention,
Using a composite transmitting and receiving probe with multiple transducers arranged, ultrasound is transmitted and received by electronic time division, so the ultrasound can be transmitted and received without moving the probe. It exhibits various excellent effects such as being able to easily and accurately detect flaws in the thickness direction of the flaw-detected part.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an embodiment of the method of the present invention, Fig. 2 is a control block diagram of the method shown in Fig. 1, and Fig. 3 is an explanatory diagram showing an example of the conventional ultrasonic flaw detection method. . 2 is a butt weld, 3.3', 3'', 3'''
, 6.6', 6". 6"' is a transducer, 5 is a composite ultrasonic wave transmission probe, 7 is a composite layer acoustic wave reception probe, 8 is a channel selector, and 10 is a The ultrasonic flaw detector, 11, indicates a pen oscillograph. Patent application Human Ishikawajima Harima Heavy Industries Co., Ltd. Hekyo N To - Concave Knee ■ ＼ , -2υN 1' ℃Kobese sitting

Claims (1)

[Claims] 1) A composite ultrasound transmitting probe in which a plurality of transducers having a predetermined input angle are arranged at a required interval, and a composite ultrasound receiving probe in which a plurality of receivers are arranged at a required interval. , each transducer and each receiver are arranged in a straight line on one side of the part to be tested, and ultrasonic waves are sequentially transmitted from the plurality of transducers and received by the corresponding receivers. An ultrasonic flaw detection method characterized by detecting flaws in the thickness direction.