A defect detection method and device

A detection method and defect technology, which is applied to measuring devices, instruments, and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems of low accuracy of detection methods, and achieve the effect of solving low accuracy and improving accuracy

Active Publication Date: 2021-03-30
CRRC YANGTZE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a defect detection method and device to solve or at least partially solve the technical problem of low accuracy of the detection method in the prior art

Method used

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  • A defect detection method and device
  • A defect detection method and device
  • A defect detection method and device

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Experimental program
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Embodiment 1

[0091] This embodiment provides a defect detection method, such as figure 1 As shown, the method includes:

[0092] First, step S101 is executed: multiple artificial defect echoes formed by ultrasonic waves on the reference test block are obtained.

[0093] Specifically, ultrasound is a sound wave with a frequency higher than 20,000 Hz. It has good directionality and strong penetrating ability. The lower limit of ultrasonic frequency is greater than the upper limit of human hearing. Ultrasonic testing is an important testing method in the field of nondestructive testing. In a specific implementation process, the defect echo can be obtained by reflecting the pulse emitted by the ultrasonic probe in the reference test block, wherein the artificial defect can be obtained by machine processing or manual production. Multiple artificial flaw echoes can be obtained on one reference test block or on different reference test blocks. In order to facilitate detection, different artifi...

Embodiment 3

[0189] Based on the same inventive concept, Embodiment 3 of the present invention provides a computer-readable storage medium 500, please refer to Figure 5 , on which a computer program 511 is stored, and the method in Embodiment 1 is implemented when the program is executed.

[0190] For example, the above program is configured to perform the following steps:

[0191] Obtain multiple artificial defect echoes formed by ultrasonic waves on the reference test block;

[0192] Obtaining the natural defect echo formed by the ultrasonic wave on the block to be tested;

[0193] A target artificial defect echo having the same height and the same sound path as the natural defect echo is determined from the plurality of artificial defect echoes, and the size of the target artificial defect echo is used as the natural defect echo the size of the wave;

[0194] obtaining a transmission correction value of the ultrasonic wave between the reference test block and the block to be tested;...

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Abstract

The embodiment of the invention provides a defect detecting method and device. The method comprises the following steps: acquiring a plurality of artificial defect echoes formed by an ultrasonic waveon a reference block; acquiring a natural defect echo formed by the ultrasonic wave on a block to be tested; determining a target artificial defect echo having the same height and the same sound pathas the natural defect echo from the plurality of artificial defect echoes, wherein the size of the target artificial defect echo is taken as that of the natural defect echo; acquiring a transmission correction value of the ultrasonic wave between the reference block and the block to be tested; and correcting the size of the natural defect echo based on the transmission correction value to obtain the corrected size of the natural defect echo. The method solves the technical problem that a detection method in the prior art is not accurate.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a method and device for detecting defects. Background technique [0002] In the ultrasonic testing of non-destructive testing, the quantitative detection of discontinuities or defects in the workpiece is usually the equivalent test block comparison method, that is, the natural defect echo in the workpiece is compared with the artificial defect echo on the test block. Quantitative detection of workpiece defects. [0003] In the prior art, a series of test blocks containing artificial defects (such as flat-bottomed holes) with different sound paths and different sizes are usually processed. When a defect is detected, the echo of the natural defect in the workpiece to be tested is compared with the test block. When comparing the echoes of the artificial defects in the same sound path, when the height of the natural defect echo at the same sound path is equal to that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/11G01N29/30
CPCG01N29/04G01N29/041G01N29/048G01N29/11G01N29/30G01N2291/015G01N2291/023G01N2291/044
Inventor 尹利尤永洪林先海于涛路凤铃王芬薛海黄春雨
Owner CRRC YANGTZE CO LTD
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