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Method for judging structural segregated band flaws in flat metal plate by using single-crystal straight probe

A technology of flat metal and straight probes, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, material analysis, and use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc. It can solve problems such as no clear white spots and crack identification methods, and achieve Improves reliability predictability, avoids cracking, provides efficiency and accuracy effects

Active Publication Date: 2019-05-21
HEBEI PUYANG IRON & STEEL
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

5.3.9.2 of the current NB / T47013.3-2015 standard only points out that "during the inspection process, if the inspector confirms that there are defects such as white spots and cracks in the plate, it should be rated as level IV", which does not clearly state How to identify defects such as points and cracks

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  • Method for judging structural segregated band flaws in flat metal plate by using single-crystal straight probe
  • Method for judging structural segregated band flaws in flat metal plate by using single-crystal straight probe
  • Method for judging structural segregated band flaws in flat metal plate by using single-crystal straight probe

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with embodiments:

[0029] The method of single crystal straight probe to judge the internal structure segregation defects of flat metal plates is to use the A-type pulse reflection ultrasonic flaw detector, and use the single crystal straight probe to detect the hot-rolled flat steel plate. According to the size of the defect in the hot-rolled flat steel plate, Types and different types of defects have different ultrasonic reciprocating sound pressure transmittances, which can be directly distinguished by comparing the respective echo heights on the oscilloscope screen, mainly by comparing the first defect echo F1 with the first bottom echo B1 The height of the wave crest is used to qualitatively determine whether the defect is a segregation zone of metal structure. Such as figure 1 , 2 As shown, the judgment of defects needs to meet the following conditions at the same time:

[0030] a. The fir...

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Abstract

The invention discloses a method for judging structural segregated band flaws in a flat metal plate by using a single-crystal straight probe and belongs to the field of ultrasonic flaw detection. According to the method, an ultrasonic flaw detector with a single-crystal straight probe is adopted to perform flaw detection on a hot rolled flat steel plate; the height of the peak of first-time flaw echoes F1 is compared with the height of the peak of first-time bottom surface echoes B1, so that discontinuity inside the steel plate can be defined accurately, and whether metal structural segregatedband flaws exist in the steel plate can be judged.

Description

Technical field [0001] The invention relates to the field of ultrasonic flaw detection, in particular to a method for judging metal structure segregation band defects by using a single crystal straight probe, which is used for flaw detection of hot-rolled flat steel plates. Background technique [0002] Currently, single crystal straight probes are used for ultrasonic testing of hot-rolled flat steel plates, and only the internal defects can be judged, quantified and graded. In actual use, after flame cutting and welding are performed on the unqualified plates found in ultrasonic testing, some can achieve the intended use purpose, and some will directly crack along 1 / 2 the thickness of the plate, that is to say Layer”, which eventually leads to scrapping of the artifact. Checking the relevant European and American ultrasonic testing standards, there is no clear description of the severity of the internal defects of the board. The current NB / T47013.3-2015 standard 5.3.9.2 only p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/22
Inventor 岳土民陈建超王智聪卢凤飞刘明生
Owner HEBEI PUYANG IRON & STEEL
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