JPS60102555A - Ultrasonic flaw detection apparatus - Google Patents

Abstract

PURPOSE:To easily estimate the position of a flaw, by transmitting and receiving a plurality of angles of refraction by a probe due to a multi-channel system and displaying the peak distribution of reflected echos to the same polar coordinates. CONSTITUTION:A probe of a multi-channel system is placed to the surface of an arranged pipe and driven so as to scan the same. For example, the multi-channel system is constituted of three channels and ultrasonic pulse beams are transmitted from the probe at angles of refraction of 0 deg., 45 deg. and 60 deg. from a scanning position in order to perform vertical flaw detection and oblique angle flaw detection while the receiving signals from the arranged pipe are digitalized to be received and stored in a memory circuit. In the next step, these signals are inputted to an operation circuit and signals of channels different in angle of refraction are operated to discriminate the position of a flaw to fabricate polar coordinates. The polar coordinates display flaw echos a0, a45, a60 on concentric circles d1, d2, d3 at every channel refraction angles 0 deg., 45 deg., 60 deg.. Therefore, the flaw detection echo peak distribution of the flaw can be displayed by polar coordinates constituted of concentric multiple circles and comparison becomes easy and the estimation of the position of the flaw, especially, at the welded part of the arranged pipe becomes easy.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an ultrasonic device, and particularly relates to an ultrasonic flaw detection device k that can display the echo height of a reflected pulse detected by a multi-channel probe on the same polar coordinates. .

[A view of the invention]

Conventional ultrasonic flaw detection equipment uses vertical probes and oblique angle probes to detect flaws at refraction angles of 0°, 45°, 60°, etc.
The echo height distribution was plotted on each polar coordinate.

This /ζ has the disadvantage that it takes a lot of time to plot each polar coordinate and that it is not easy to compare each other.

[Purpose of the invention]

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide an ultrasonic probe that can display the echo height distribution of reflected pulses received at multiple refraction angles using a multi-channel probe on the same polar coordinates. The goal is to provide equipment.

[Summary of the invention]

The present invention is to display the echo height distribution in an arbitrary cross section parallel to the weld line of a pipe welded part in polar coordinates composed of N8 multiple circles for each refraction angle. The above objective is achieved by displaying the echo height distribution in polar coordinates.

[Kimei no Fire 7A! 1 Example] Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. Figure 1 is a block diagram showing the overall structure of an embodiment of an ultra-H wave detector by IJJ. be. A probe 11 is a scanning camera (not shown) mounted on the surface.

The dynamic system moves them in the (X,,Y) direction while maintaining mutual control. The wave transmitting/receiving circuit 10 is searchable! , l + ultrasonic wave generation fljlll bamboo in child 11 (1 (Ill ) and probe PJh
The received signal received by the child 11 is received 4n (L?, ). In addition, in general, it is a J-wave pulsed beam (more than 1゛u) and a reflected pulsed beam. The wave transmitting/receiving circuit lOt detects the reflected pulse beam, and the digitalization circuit 14 converts the wave output into a digital signal. The data memory 15 can also store the position (X, Y) of the position detector 13, the reflected pulse 1 of the Larntalizing circuit 14, and flaw detection conditions such as the refraction angle and propagation velocity of the ultrasonic wave. The probe position 1t(x, y), the wave height value and the propagation time of the reflected pulse 11 are sequentially arrayed and stored.

The arithmetic processor 16 selectively takes in the data stored in the data memory 15, automatically locates the defect position, and outputs the results to a display device.

Hereinafter, the process of storing position information, etc. in the data memory 15 and displaying the results will be described in detail.

Figure 2 shows how the probe 11 is scanned at each scanning line L+ on the piping surface.
+ Lx +...L+... During this movement, the ultrasonic beam is transmitted and received at each transmission and reception position on each line L. As for the position information, the circumferential direction of the pipe is set as X, and the axial direction is set as y. In this case, data as shown in FIG. 3 is formed in the data memory 15.

Figure 3 shows position detection illusion 13. The storage status of online information captured via the digitization circuit 14 is shown. Third
Figure (a) is formed for each scanning position (HN#Tif
,! p, Figure-ru shows the scanning position (Xt, Y+) and a portion of the scanning position (x+*Yz). It is assumed that the probe 11 adopts a multi-channel system and supports three channels.

The 3 channels are a channel for detecting directly below the scanning position (θ-=θ°), a channel for performing oblique flaw detection at 45° from the scanning position (θ-45°), and a channel for performing oblique flaw detection at 60° from the scanning position. It is a Nayannel (θ-60°) that performs the following. However, in Figure 3, instead of θ=00° θ=45° and θ-600, θ-θ! , θ−θ2. It is generalized as θ−θ3. ↑1j' information area Ai'l 1, Ai'12,
Ai'13 is an area for storing the wave height value A and the propagation time Il+ at the wave transmitting/receiving position. Also, ni is each II'! Indicates the number of data in the information area. Figure 3 (b) shows information line area A.
This shows the detailed configuration of TII, and shows four sets of wave heights and propagation times (All, Tll.

(A12.T12), (A13.T13).

Take in (Al 4. '1' 14 ) and store -C
There is. , Fig. 3 (c) is an example of information A'l'12, and three sets of wave height values and propagation times? 1: Shown. Fourth
The figure shows a flowchart 1 of processing centered on the arithmetic processor 16.
・Not shown.

In the flow 100, as shown in FIG. 5, an arbitrary position YL parallel to the pipe welding line W and a display range width in the pipe axis direction y are set.

Flow 101 is a wave height 1 direct A from the foul pulse information area,
Propagation time +1'l, the probe position (Xtyl is taken out of the bladder, and the defect position (X, Y, Z) is calculated in flow 102. Figure 6 shows the details of the defect position @ elevation. .The path length tI from the time distribution 1. to the defect f1 at the only child position (Xt + Y+) is determined by the equation (1). ■ is the propagation speed of the object 12 to be inspected.

t,=V-t,...(1) Furthermore, the path length 1 determined by equation (1). and the defect f from the refraction angle θ
The coordinates (XI, Yl, Zl) of , are determined by equations (2) to (4).

X1=Xl...(2) Yl-=alsinθ+Y+-(3) Zl=t1co
Sθ − (4) Coordinates (xi, yi) of defect f determined above.

Flow 10 to determine whether it is a polar coordinate display range from Zl+
Do it in 3. When formula (5) is satisfied, it is within the display range.

Yb: Y+ law Any position in the force direction AY sleeve inward direction display 1ota 4 104, 105, 106 respectively, fat refraction angle Q O1 refraction angle 45°. The echo height AI of the defect fl is plotted on polar coordinates with a refraction angle of 60°. The polar coordinate display is not shown in Fig. 7. The circle d shows a refraction angle of 0°, the circle d2 shows a refraction angle of 45°r, and the circle d3 shows a refraction angle of 60°, and the echo height is 0% on each line.

The circle d is a scale, and the circumference of the pipe is 1ijl X00
.

~360° is shown. Echo height a of the bending angle of the defect f1. + a45 + allo makes it easy to compare each other, and it is clear that there is a defect f+.

〔Effect of the invention〕

According to the present invention, the echo height distribution of flaw detection at each refraction angle can be expressed in the same diagram, and the time for creating the coordinate display (i41 f17i) is reduced. The distribution ratio axis can be used to easily estimate defect locations.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 is a diagram showing the scanning procedure for flaw detection, and Fig. 3 (A), (
mouth). (C) is a table diagram in the memory, Figure m34 is a flowchart of processing, Figure 495 is a diagram explaining parameter settings, Figure 6 is a diagram explaining defect position calculation, and Figure 7 is a diagram showing an example of displaying polar coordinates. IO...Transmitter/receiver, 1st...probe, 12...branch inspection object, 13...position detector, 14...digitization circuit, 15...data memory, 16... Arithmetic processor, 17...Display 1st entry 20th entry 40 Foil 5[] 2 6th day 1st page continued 0 Inventor Hide Tani - 3-chome Saiwaimachi, Hitachi City In-house

Claims (1)

[Claims] 1. Emit an ultrasonic pulse beam to an object to be inspected via a probe, receive a reflected pulse from a reflector existing inside the object, and determine the propagation time and waveform of the reflected pulse. Locate the reflector position from the high value and probe position. In an ultrasonic flaw detection device capable of displaying the orientation results, etc., it is possible to display the distribution of echo height in an arbitrary cross section parallel to the weld line of a pipe welded part for each refraction angle on polar coordinates consisting of an N8 multi-ice circle. Features of ultrasonic flaw detection equipment. 2. In claim 1, for polar coordinates consisting of triple circles, the refraction angles are 0°, 45°, and 45° from the inner circle, respectively.
An ultrasonic flaw detection device characterized by displaying in polar coordinates the distribution of echo heights corresponding to the three-force deflection angle on an arbitrary i1i plane divided by 60 degrees.