JPS613059A - Determination of flaw position for ultrasonic flaw - Google Patents

Abstract

PURPOSE:To enable the setting of a scanner at random with respect to the weld line of work along with a higher flaw detection accuracy and working efficiency, by automatically taking-in the flaw detection data and position data to automatically figure out the position of a flaw by a computation processing. CONSTITUTION:The incident point P of a probe is matched with the first reference point A on the weld line of work to take in position coordinates on the X and Y axes and the angle theta of oscillation with zero as reference point on the scale. Then, the position coordinates on the X and Y axes are taken in by matching the incident point with the second reference point B on the weld line to determine the set angle alpha of a scanner itself with respect to the weld line from these and the position coordinates of the reference point A. Based on the angle alpha, the position coordinates N(X1, Y1) of the incident point of the probe at the position of a flaw detected are determined with the weld line as reference. In this manner, the horizontal distance L between the incident point of the probe and the flaw position Q is determined from the preset oblique angle phi of the probe and the beam course W to the flaw to figure out the position coordinates (X2, Y2) of the flaw position Q with respect to the weld line by the formula, wherein X0 and Y0 represent position coordinates of the probe on the X and Y axes at the flaw position with the scanner as reference.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flaw position indexing method in ultrasonic flaw detection in which the position of a flaw existing in a welded part of a material to be inspected is calculated by moving and scanning a probe.

[Prior art and its problems]

Generally, in ultrasonic flaw detection, a probe is run in a zigzag pattern along the welded part of the test material, the signal from this probe is displayed on a CRT on a flaw detector, and the echo image of ( The defect is determined from the echo height and beam path.
, while moving the probe, find the starting point and end point of the flaw and measure it with a tape measure to find out the total length of the flaw, and then find the highest point of the echo of the flaw, Qj t.
- Find it by swinging the probe, read the height of the echo at that time, read all seven beam paths, measure the probe position with an IRk measure, record it, and record the recorded content of the probe position and beam level. The flaws are located on the gold side by calculation based on the thickness of the material to be inspected.

However, with the above-mentioned conventional flaw position indexing means in ultrasonic flaw detection, it is difficult to read the flaw detector displayed on a CRT by a skilled person, and the personal reading error is very large. It is easy to cause calculation errors, and as a result, there are various problems such as low flaw detection accuracy and poor workability.

In addition, conventionally, as disclosed in, for example, Japanese Patent No. 48-40495, ultrasonic flaw detection can be carried out fully automatically by moving a probe parallel to the welded part of the test material. There is a well-known scanning device that can measure all the defect positions by scanning, but in this type of device, it is necessary to install the scanning device parallel to the weld line on all the materials to be inspected, and the positioning is expensive. There are disadvantages such as the need for precision.

[Purpose of the invention]

This invention was made under the above circumstances, and its purpose is to automatically import flaw detection data and position data using a probe for a welded part of a material to be inspected, and to Based on various data of the probe, the number of scratches is
It is an object of the present invention to provide a complete method for determining flaw positions in ultrasonic flaw detection, which performs fully automatic calculation processing and is capable of randomly placing a scanning device on a material to be inspected.

[Structure and effects of the invention]

The purpose mentioned above? In order to achieve this, the present invention provides a probe that is movable in the axial direction and attached to the Y-axis frame that is movable in the axial direction of the X-axis frame that is installed along the weld line of the material to be tested. It is equipped with a scanning device held in a swingable manner, and records flaw detection data and position data from the probe of the scanning device in a storage medium of a data recording device, and also records data information recorded in the storage medium in a data processing device. In the ultrasonic flaw detection means, which performs data analysis processing by inputting data separately to the Take the head oscillation angle as a scale reference point of O, and then align the incident point of the probe from the first reference point to a second reference point, which is an arbitrary point on the welding line, and adjust its X axis. - Incorporate the Y-axis position coordinates and use the position coordinates of the first reference point to determine the installation angle of the scanning device itself with respect to the weld line, and determine the entire weld line reference at the defect detection position based on the installation angle of the scanning device. In addition to finding the positional coordinates of the incident point of the probe that has been set to It has a configuration in which the position coordinate of the incident point of the probe with respect to the weld line is 1, and the deviation [1] can be determined from the swing angle and the w-line distance between the plane and the scratch position. It is now possible to fully automatically determine the flaw location at the # contact part of the material to be inspected, which improves flaw detection accuracy and work efficiency, and also prevents the trap and scanning device from being placed non-parallel to the weld line of the material to be inspected. We can expect great effects such as being able to install it in a safe condition.

[Embodiments of the invention]

EMBODIMENT OF THE INVENTION Hereinafter, this invention will be described in detail based on an embodiment fully illustrated.

As shown in FIG. 1, reference numeral 1 in the figure is an ultrasonic flaw detection data storage device, which outputs a beam to an ultrasonic flaw detector 2 at the same time as displaying it on a CRT based on a flaw detection signal on a test material G by a scanning device, which will be described later. Captures flaw detection data such as path length and echo height, and position data such as the X-axis, Y-axis and swing angle of the probe, and records these various data on a storage medium such as a cassette tape or floppy disc. In addition, the flaw detection data and position data recorded on this storage medium are input to the data processing device 3, analyzed, and automatically classified into flaw positions or equal numbers, etc., and printed out. ing.

As shown in FIG. 2, the above-mentioned scanning device 4 is configured to
An X-axis frame 5 installed in the left-right direction along the welding line T'-T, and a Y-axis frame 7 straightly connected to a guide rail 6 provided along the axial direction of the X-axis frame 5 The base end 7aVi of this Y-axis frame 7
,, is movable left and right via guide rollers 8, 8 that engage with the guide rail 6. A slide rail 9 is disposed on the Y-axis frame 7 in the front-rear direction along the axial direction, and the slide rail 9 includes a slider 1.
A probe holder 12 is movably attached via a support arm 11 fixed at 0, and the support arm 11 is attached to a first support arm 12 which is horizontally rotatable with respect to the vertical plane of the specimen G. The holder 12 is pivotally supported by a link 110 so as to be swingable left and right, and a second link 111 which is movable up and down about the central axis of the slide rail 9 is pivoted to the first link 110. This allows the holder 12 to swing freely in the front, rear, left, right, and up and down directions. Further, the holder 12 includes a probe 1.
3 is removably attached, and the probe 13 is attached to the operating rod 14.
It can swing freely in the horizontal direction with respect to the flaw detection surface of the material G to be inspected.

That is, the scanning device 4 scans position data such as the movable position of the Y-axis frame 7 with respect to the X-axis frame 5, the movable position of the probe 13 with respect to the Y-axis frame 7, and the swing angle θ of the probe 13, and the specimen material. Back and forth scanning, left and right scanning, 1 swinging scan, pendulum scanning, zigzag scanning, parallel scanning and diagonal parallel scanning in order to import flaw detection data such as beam path length W and echo height E at the defect detection position of G into the data recording device 1. It makes it possible to do everything.

Next, the flaw detection scanning means and flaw position indexing means by the scanning device 4 will be explained in detail with reference to FIGS. 3 to 6.

The incident point P'l of the probe 13 is placed on the rotation axis of the operating rod 14 of the holder 12 without interfering with it! (d) Scanning device 4 mounted in a matching manner.
is placed on the test material G as shown in FIG. At this time, the X-axis frame 5 is positioned in a random state non-parallel to the welding line TT of the test material G. next,
As shown in the flowchart in FIG. After setting the merging angle θ to the 0 degree scale (STI), set the Y-axis/Y@ position coordinates of point A to fcA (0, 0) and set the scale and single point (Sr2). Next, the incident point P of the probe 130 is aligned with a second reference point which is an arbitrary point B on the entire welding line TT, that is, an appropriate point in the length range of the X-axis frame 5 (Sr
3) After acquiring the coordinates (XB, YB) of the Y-axis and Y-axis (Sr1), flaw detection is started by manually scanning the probe 13 in a zigzag pattern (Sr1).

At this time, an ultrasonic pulse is emitted from the ultrasonic flaw detector 2 through the probe 13 into the interior of the material G to be tested at a predetermined oblique angle (refraction angle) φ (Sr1), and the material G to be welded is welded. Defects within the department (wj
) is converted into an electrical signal through the probe 13 and returned to the ultrasonic flaw detector 2.
1) Analyze the flaw with the ultrasonic flaw detector 2 and display it on the CRT, and output all the flaw detection data such as the beam path W and echo height E to the data recording device 5T8).
Make a complete judgment as to whether the flaw detection data is a valid flaw or not (
Sr9).

If the flaw is not a valid flaw, the process returns to Sr1 and the above-mentioned operations are repeated, while if it is determined to be a valid flaw, the flaw detection data W and E and the X-axis frame 5 in the scanning device 4 are processed. The position data f such as the position coordinates N (Xo, Yo) of the Y-axis and Y-axis on the Y-axis frame 7 and the swing angle θ are imported into the recording device 1 (ST
IO). Next, it is determined whether or not the welding has been performed over the entire area of the test material G (5TII), and if it has not been completed, the process returns to Sr1, and if it has been completed, it is recorded in the data recording device. The loaded flaw detection data and position data are recorded on a storage medium such as a cassette tape or a floppy disc (ST12).

In this way, the flaw detection data and position data of the test material G recorded at the flaw detection site are separately input to the data processing device 3 for analysis processing. As shown in the flowchart, first, the beam path length W based on the flaw detection data and the oblique angle φ monitor of the probe 13 inputted in advance are used to calculate the deviation [ from the incident point P of the probe 13, as shown in FIG. Find the straight line distance on the plane at Q-1 (ST13); L = Wo sinφ −] W0 ° beam path,
φ, oblique angle where: W, = WxV/2 W: 5T
Beam path length [μs] read in step 10 = sound speed (m/s) Next, the scanning device f is determined based on the position data at points A and B.
Installation angle α with respect to welding line T-T on test material G at t4
(ST14); = /770]ζ;' K: Distance between points A and B. Furthermore, the installation angle α and position data N(X
, , Y, ) Welding from VC @ T - T (Position coordinates N (XI, Yl) of the incident point P of the probe 13 based on 5 standards
After w is determined (SrI2); From the straight line distance ri, find the flaw size 1i1Q(X,Y) that satisfies the following formula:
(ST16), Yl = (Yo −Xo ・−α)・■α−L■(θ
-α) ゛This is what you print out.

By the way, in determining the flaw depth df, as shown in Fig. 6, in addition to the straight line distance on the plane from the incident point P of the probe 13 found in 5T13 to the flaw position Q1, we also calculate the distance from the skip point to the skip point. Find the distance Ll; L, = t,
(L/L+) If the value of this skip multiple S is an odd number, d-t, (
S+1)-W(1(2)φ Also, when the skip multiple S is an even number, it is obtained from the formula d=Woamφ-t, -8.

Therefore, according to the configuration according to the present invention described above, A
The installation angle α of the scanning device 4 is calculated by setting two reference points on the welding line T-T consisting of points and points B, and based on this installation angle α, the position coordinates are determined based on the welding line T-Tt. Since the scanning device 4 can be installed randomly on the material G to be inspected, the installation work can be done easily, and since the moving parts adopt a linear traveling motion, Calculation formulas using trigonometric functions can be simplified, and calculation processing can be performed quickly.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the overall configuration of an ultrasonic flaw detection system using a scanning device according to the present invention, Fig. 2 is an overall view of the scanning device, and Fig. 3 is a state in which the scanning device is installed on a material to be inspected. FIG. 4 is a flowchart showing the flaw detection operation, FIG. 5 is a flowchart showing flaw position indexing means, and FIG. 6 is an explanatory diagram showing the flaw detection position coordinates of the probe. FIG. 3 is an explanatory diagram showing a relationship between an incident point and a flaw position. 1...Data recording device, 2...Ultrasonic flaw detector, 3...
- Data processing device, 4... Scanning device, 5... X-axis frame, 7... Y-axis frame, 13... Probe, G.
...Test material, T-T...Welding line, A...First reference point, B...Second reference point, P...Incidence point, Q...
Flaw position, (Xo, Yo)... positional coordinates of the probe with respect to the scanning device, (Xl. Yl)... positional coordinates of the probe with respect to the weld line,
α... Installation angle of the scanning device with respect to the welding line, θ...
Probe swing angle, φ...probe oblique angle (refraction angle),
L: Straight line distance on a plane from the point of incidence of the probe to the flaw,

Claims (1)

[Scope of Claims] A probe is attached to a Y-axis frame that is movable in the axial direction of an X-axis frame that is installed along the welding line of the material to be inspected, and the probe is movable in the axial direction and can be oscillated. Equipped with a scanning device that can be held freely, flaw detection data and position data from the probe of the scanning device are recorded on a storage medium of a data recording device, and the data information recorded on the storage medium is separately input to a data processing device. In an ultrasonic flaw detection means that performs data analysis processing, the incident point P of the probe is aligned with the first reference point A on the weld line of the test material, and the position coordinates of the X-axis and Y-axis and the swing angle are determined. Take it as a scale reference point where θ is 0, and then align the incident point of the probe from the first reference point A to the second reference point B, which is an arbitrary point on the welding line, and adjust its X-axis and Y-axis. The installation angle α of the scanning device itself with respect to the weld line is obtained by taking in the position coordinates of the first reference point A, and the weld line at the defect detection position is referenced based on the installation angle α of the scanning device. The position coordinates N(X_
1, Y_1), and the direct distance L on the plane from the incident point of the probe to the scratch position Q using the preset probe oblique angle φ and the beam path length W to the scratch. A flaw position indexing method in ultrasonic flaw detection characterized in that the position coordinates (X_2, Y_2) of position Q with respect to the weld line satisfy the following formula: X_2=Lsin(θ-α)+(Y_0- X_0・ta
nα)・sinα+X_0/cosα Y_2=(Y_0−X_0−tanα)・cosα−L
cos(θ-α) However, (X_0, Y_0): X-axis and Y-axis position coordinates based on the scanning device of the probe at the scratch position