JPS60107562A - Ultrasonic flaw detector - Google Patents

Abstract

PURPOSE:To obtain a fine image of a weld penetration bottom part of penetration welding by using a linear array flaw detector, and switching oscillators for the flaw detector successively and scanning the flaw detector. CONSTITUTION:A linear array probe 8 having numbers of oscillators arrayed linearly is held on a self-running carriage 6 which runs on guide rails 5. The carriage 6 is moved in parallel to a weld zone 2 to make a scanning in the running direction, and the operation of respective oscillators of the linear array probe 8 is switched electronically in order to make a scanning at right angles to the running direction. A pulse run-out period and a reflected wave reception period are adjusted for every oscillator of the linear array probe 8 to obtain a desired scanning pattern. For the purpose, delay time is varied in order by a scanning control circuit 10 through a transmission delay circuit 11, pulse generator 12, and transmission switch group 13 to scan on the respective oscillators. On the other hand, the delay time is varied in order by a reception switch group 14, reception delay circuit 15, and adding circuit 16 to multiplex reflected waves received by the respective oscillators and make a scanning.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic flaw detection device that detects the shape of the weld bottom of a corner joint portion that has undergone partial welding and detects the presence or absence of strings.

Bridges and other tonal structures are made of steel plates (as shown in Figure 1).
1) and partially drop weld the corner joint part (2).
) are often used.

Factors contributing to the decrease in fatigue strength and the occurrence of cracks in such corner joints include the shape of the welding welding welding lower part (3) and the presence or absence of grains (4).

Therefore, an ultrasonic flaw detector has conventionally been used to detect the shape of the welded bottom part and the fins.

As a conventional ultrasonic flaw detection device, as shown in Fig. 2,
A vertical ultrasonic probe (7) is held on a self-propelled cart (6) running on a guide rail (5), and the ultrasonic probe (7)
) is reciprocated in a direction (9) that intersects by 1μ with the running direction of the trolley (6), resulting in a rectangular locus (20) as shown in Figure 3 (a) and as shown in Figure 3 (b). A device is known that detects flaws by tracing the locus (21) of a silver waveform. In addition, while the incident ultrasonic wave travels through the partially welded area, it is reflected at the unwelded area, and the reflected wave can be received by the probe (7). A device is also known in which a servo mechanism causes the probe (7) to follow the bottom of the seepage so that the received wave intensity is, for example, 50%.

In such conventional flaw detection equipment, a self-propelled trolley (6)
The probe (7) must be moved in a direction perpendicular to the direction of movement of the probe, and a movement mechanism is required for this purpose.Although flaw detection is performed in a linear manner, the flaw detection speed is slow and flaw detection may occur. Ta.

Therefore, the present invention was devised to solve the problems of such conventional flaw detection equipment, and as shown in Fig. 4, which will be explained in detail based on the drawings,
A linear array probe (8) with a large number of transducers arranged in a line is mounted on a self-propelled trolley (6) that runs on a guide rail (5).
) is held, and scanning in the running direction of the carriage (6) is performed by moving the carriage.Scanning in the direction perpendicular to the running direction of the carriage (6) is carried out by each transducer of the linear array probe (8). This is done by sequentially switching the operations electronically.

In order to obtain a desired scanning pattern by adjusting the pulse sending timing and reflected wave receiving timing for each transducer of the linear array probe (8), a scanning control circuit ( 10), the scanning delay circuit (11), pulse generator (12), and transmission switch group (13) are used to sequentially change and switch the delay time and excite each vibrator to perform scanning. conduct. On the other hand, the receiving switch group (14)
, a reception delay circuit (15), and an addition circuit (16) sequentially change the delay time and combine the reflected waves received by each vibrator to perform scanning.

In addition, a signal (
17) and a control signal from the scanning control circuit (10),
The indicator (18) and the recorder (19) are equipped with a coordinate signal generation circuit (20) that generates a signal related to coordinates such as a deflection voltage or a recording chart feed signal. By configuring this, various formats such as A scope, B scope, and C scope can be taken as the instruction/recording format.

As explained above, according to the ultrasonic flaw detection device of the present invention, since the linear array probe (8) is used,
Linear scanning, in which the transducers are sequentially switched and excited, and deflection scanning, in which the timing of excitation of each transducer is staggered, can be performed, making it possible to obtain fine-grained images. Not only 3) but also grains (4) can be easily found.

[Brief explanation of drawings]

Figure 1 is a perspective view showing a corner joint part of a steel structure with a seepage weld, Figure 2 is a pressure surface view of a conventional ultrasonic flaw detection device, and Figures 3 (a) and (b) are , FIG. 4 is a front view of the ultrasonic flaw detection device of the present invention, and FIG. 5 is a circuit related to the device shown in FIG. 4. This is a block diagram, and the same parts are marked with numbers throughout each figure. Shaved ears 11 times! Procedural amendment (method) % formula % 1. Indication of case 1982 Patent Application No. 214080 2
, Title of the invention Ultrasonic flaw detection device 3, Relationship with the person making the amendment Patent applicant address 10-20 Horinouchi-cho, Yozaki-ku, Yozaki-shi, Kanagawa (
210) 4. Date of amendment order: February 8, 1982 5.
Subject of amendment: Application and drawing 6, contents of amendment: As attached.

Claims (1)

[Scope of Claims] A cart that moves parallel to the welding part, and a linear array probe held by the cart and having a large number of ultrasonic transducers arranged in a direction perpendicular to the traveling direction of the cart. , a pulse generator, an indicator, a recorder, and the pulse output of the L pulse generator is switched and applied to each transducer of the linear array probe, and the pulse output is applied based on the reflected wave generated by each transducer. An ultrasonic flaw detection apparatus characterized by comprising a group of electronic switches for guiding pulse output to the indicator and the indicator, a scanning control circuit, a delay circuit, an addition circuit, and a coordinate signal generation circuit.