JPS6086462A - Ultrasonic flaw detecting system - Google Patents

Abstract

PURPOSE:To record appreciation having a correct indication by measuring the plate thickness of a body to be tested during flaw detection scanning and analyzing flaw detection data by using the shape of the body to be tested based upon the plate thickness data. CONSTITUTION:An ultrasonic analyzing diagram 10 outputted on the basis of flaw detection shows an indication detecting position 11 and a reflection source position 12 together with a sectional shape at the position 11. At the input of the shape of the body to be tested, an arm 3 can be vertically moved around an arm supporting point 13, a distance S up to a probe 2, a deviation phi (angle) from the center position of the arm 3 and the vertical moving distance l of the probe in a probe holder 14 are inputted as the data of an external shape 15 to find out external coordinates ZS=2Ssinphi/2+l. As to an inner shape 16, a bottom echo 17 is gated 18 by using the vertical method for ultrasonic flaw detection, plate thickness width is found out from the reciprocated time of the signal and the shape of the body to be tested is plotted by using the inner coordinates ZB=ZS+T and TS. Thus, the appreciation having a correct indication is recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is applicable to flaw detection data? The present invention relates to an ultrasonic flaw detection system that outputs output, and particularly relates to a system suitable for an automatic ultrasonic flaw detection system that combines vertical flaw detection and oblique flaw detection.

[Background of the invention]

Conventional ultrasonic flaw detection systems output data on detected indications and their positions, as well as accompanying plan views, cross-sectional views, wave height development diagrams, etc. Since it was not possible to output an ultrasonic analysis diagram that could be recognized at the same time as the reflection source, there was a drawback that only this part had to be created by humans using a ruler. In addition, the internal shape of the object to be inspected cannot be grasped, only the drawing dimensions are considered correct, and ultrasonic analysis is performed in which changes in shape such as thinning cannot be taken into consideration.

[Purpose of the invention]

The purpose of the present invention is to measure the inner surface shape of an object to be inspected,
By analyzing the ultrasonic flaw detection data based on this shape, it is possible to measure and record correct indications.

[Summary of the invention]

Indications in current ultrasonic flaw detection tests are analyzed and evaluated by humans. In this case, the inner surface shape of the object to be inspected can only be grasped by manual measurement or by drawing.

Kenpo uses the bottom waves of the vertical flaw detection method to perform all automatic drawings, and also outputs the detection position of the indication and the reflection source on the same sheet of paper.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. Signals from a scanning section consisting of a probe 2 that scans the entire outer surface of the object 1 to be inspected, a guide arm 3 for detecting the position, a track 4, and a position detection device 5 are transmitted to the ultrasonic flaw detection bag (Mt6,
The system is such that data transmitted to the signal processing device 7 and processed by the computer 8 is output from the output device 9. The ultrasonic flaw detection data shall include bottom wave data obtained by the vertical flaw detection method for measuring the inner surface shape. The indication detection position 11 and the reflection source position 12 are specified in the ultrasonic analysis diagram 1O outputted by the above-mentioned flaw detection together with the cross-sectional shape at the indication detection position.

FIG. 2 shows a mechanism for taking in gold outside the body to be inspected. The arm 3 must be able to move up and down around the arm fulcrum 13'lr, and the data on the outer surface shape 15 include the distance S1 when the probe is 2 years old, the amount of deviation ψ (angle) from the arm center position, and the probe Vertical movement amount tft of the probe in the holder 14
The external surface position coordinate Zs is determined using the formula (1).

The inner surface shape 16 is determined by applying IEI to the bottom echo 17 using the vertical method of ultrasonic flaw detection, determining the round trip propagation time t'l of the signal, and determining the plate thickness T(r) using the equation (2).

T= Ct/2 ・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・(2) Here, C is the speed of sound in the object to be inspected. Then, the inner surface coordinate ZB is expressed by equation (3).

Z a = Z a + T ・・・・・・・・・・・・
(3) Using the Zs and Zak obtained in this way, the shape of the object to be tested is plotted.

Further, FIG. 3 shows the relationship between the probe refraction angle θ and the outer surface shape of the object to be inspected in an ultrasonic flaw detection test of a welded structure. Since the outer surface of the weld is usually concave due to thermal contraction, the probe 2 near the weld is tilted with respect to the parallel part 19 located away from the weld, and the refraction angle of the probe is θ is
The angle is apparently θ' with respect to the parallel part. θ' is expressed by equation (4) as an angle ψ with respect to the axis 20 parallel to the parallel portion of the probe driving guide arm 3.

θ′=θ−ψ ・・・・・・・・・・・・・・・・・・
・・・・・・・・・(4) This ψ gold guide arm fulcrum 1
By detecting the ultrasonic beam with the rotary encoder 21 placed at 3 and analyzing the ultrasonic beam using θ' at each probe position, the conventional method as shown in FIG. As shown, it is possible to estimate the position of the ultrasonic reflection source more accurately than the analysis of the ultrasonic beam on the assumption that the entire range of the weld is parallel.

〔Effect of the invention〕

According to the present invention, since the external and internal shapes of the object to be inspected can be actually measured, the comprehensive evaluation of the detected indications can be automatically corrected.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of a system according to an embodiment of the present invention and an explanatory diagram of a data output format, Fig. 2 is a mechanism diagram for capturing the shape of an object to be inspected, and Fig. 3 is an external shape 1 of a welded part. ,
FIG. 4 is a conceptual diagram of the surface shape and probe assuming that the outer surface shape of the welded part is parallel to the base metal. l...Object to be inspected, 2...Probe, 3...Guide arm, 4...Trajectory, 5...Position detection device, 6...
Ultrasonic flaw detection device, 7...Signal processing device, 8...Computer, 9...$l Diagram (anchor) 2nd solid (cL), 3

Claims (1)

[Claims] 1. In an ultrasonic flaw detection system consisting of an ultrasonic flaw detection device and a position detection device, the thickness of the inspected object is measured during the flaw detection scan, and the value is memorized so that this thickness data can be used as a basic method. This ultrasonic flaw detection system is characterized by the ability to output all analysis diagrams of ultrasonic flaw detection test data using the tangible shape of the object being tested.