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Ultrasonic time of flight diffraction (TOFD)-based offline defect judgment method

A discrimination method and defect technology, applied in the direction of processing the detection response signal, etc., can solve the problems of large error, long period, and the diagnosis result is greatly affected by human factors, and achieve the effect of effective identification and precise positioning and improvement of image resolution.

Inactive Publication Date: 2012-03-28
JIANGSU SUPERVISION & INSPECTION INST FOR PROD QUALITY
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing ultrasonic TOFD detection defects need to rely on manual discrimination, resulting in long cycle, large errors, and the diagnosis results are greatly affected by human factors. Ultrasonic TOFD off-line discrimination method of size

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  • Ultrasonic time of flight diffraction (TOFD)-based offline defect judgment method
  • Ultrasonic time of flight diffraction (TOFD)-based offline defect judgment method
  • Ultrasonic time of flight diffraction (TOFD)-based offline defect judgment method

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0052] Such as figure 1 -4 shown.

[0053] A welding defect ultrasonic detection off-line discrimination method, it comprises the following steps:

[0054] First, use the ultrasonic detector to perform D-scan on the object to be detected, obtain the through wave, bottom echo and A-scan signal of the object to be detected, and synthesize and generate a D-scan image;

[0055] Secondly, the combination of image processing and through-peak search is used to accurately locate the through-wave and bottom echo, complete the computer calibration of the ultrasonic atlas, and obtain the plate thickness value of the tested object;

[0056] Third, use peak calibration and differential algorithms to straighten and eliminate straight-through waves with aliased near-surface defects;

[0057] Fourth, using synthetic aperture aggregation technology, beam sharpeni...

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Abstract

The invention discloses an ultrasonic time of flight diffraction (TOFD)-based offline defect judgment method, which is characterized by comprising the following steps of: 1, scanning a body to be detected by using an ultrasonic detector to acquire lateral waves, bottom echoes and A scanning signals of the body to be detected, and synthesizing to obtain a B / D scanned picture; 2, accurately positioning the lateral waves and the bottom echoes by using an image processing and lateral peak search combined method to complete computer calibration of an ultrasonic atlas so as to obtain a plate thickness value of the body to be detected; 3, straightening and eliminating lateral waves with overlapped near surface defects by using peak calibration and a difference algorithm; and 4, performing wave beam sharpening and image enhancement treatment on a B scanned picture by using a synthetic aperture convergence technology to obtain an accurate position of a weld defect. By the method, near surface and internal defects can be effectively identified and accurately positioned, and the method can be widely applied to the field of ultrasonic nondestructive detection.

Description

technical field [0001] The invention relates to an ultrasonic nondestructive testing technology, in particular to an off-line processing method for ultrasonically detected defects, in particular to an off-line identification method for ultrasonic TOFD defects. Background technique [0002] As we all know, ultrasonic diffraction time-of-flight detection technology (Time of Flight Diffraction, TOFD) can more accurately characterize the position, length, height and shape of weld defects in medium and thick plates. Therefore, this technology is widely used in nuclear industry, electric power, bearing It has broad application prospects in engineering fields such as compression equipment, railways, and bridges. Although TOFD technology has long been out of the laboratory, its research has never stopped. There are still many problems to be improved in the analysis of TOFD patterns, including the positioning and quantitative description of welding defects. [0003] First of all, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44
Inventor 朱宇宏王燕陈华斌姚强
Owner JIANGSU SUPERVISION & INSPECTION INST FOR PROD QUALITY
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