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Method for judging inclusion group flaws in flat metal plate by using double-crystal straight probe

A flat metal, straight probe technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as clear instructions, and achieve the effects of improving accuracy, lowering personnel training costs, and reducing difficulty

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

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Problems solved by technology

Consult the relevant European and American ultrasonic testing standards, and there is no clear description of the relevant content

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  • Method for judging inclusion group flaws in flat metal plate by using double-crystal straight probe

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Embodiment Construction

[0019] Below in conjunction with embodiment the present invention is described in further detail:

[0020] A method for judging inclusion group defects in flat metal plates with dual-crystal straight probes, suitable for the detection of internal inclusion groups on flat metal plates with a thickness of more than 6mm by using a type A pulse reflection ultrasonic flaw detector, and also applicable to conventional The 5Pφ20F10 dual-crystal straight probe detects the internal inclusion group on the flat metal plate with a thickness of more than 6mm, including the following steps:

[0021] (1) Choose to use 5Pφ20F10 dual crystal straight probe:

[0022] (2) Choose to use the flaw detector within the verification period to adjust the instrument;

[0023] (3) After finding the defect, adjust the detection sensitivity to see the peak profile of the defect wave;

[0024] (4) When judging whether the waveform satisfies the following conditions, if so, it can be judged that the defect...

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Abstract

The invention discloses a method for judging inclusion group flaws in a flat metal plate by using a double-crystal straight probe and belongs to the technical field of mechanical engineering raw material ultrasonic testing. An ultrasonic flaw detector provided with a 5P[Phi]20F10 double-crystal straight probe is selected to perform flaw detection. After a flaw position is found out, an image on the display screen of the ultrasonic flaw detector is observed. It can be judged that the flaw is a inclusion group when the image satisfies the following conditions that: flaw waves F and first-time bottom surface echoes B1 exist simultaneously, and the wave height of the flaw waves F is not higher than the wave height of the first-time bottom surface echoes B1; the flaw waves F are located at a position of 1 / 4 or 3 / 4 of the thickness of the plate; and the waveforms of the flaw waves F are cluster-like, and the flaw waves F have a plurality of peaks on the vertical sonic path distance of the instrument, and the peaks are jagged. With the method of the invention adopted, whether an inclusion group group flaw exists in the flat metal plate can be accurately judged, and therefore, the severityof the internal flaw of the plate can be clearly known, and the loss of raw materials and existing energy sources can be reduced.

Description

technical field [0001] The invention relates to the technical field of ultrasonic detection of mechanical engineering raw materials, in particular to a method for testing and judging internal defects of plates. Background technique [0002] At present, the ultrasonic detection of hot-rolled flat metal sheets is carried out with dual crystal straight probes, but the internal defects are only defined, quantified and rated, and the judgment rules for various defects are not introduced in detail. The understanding of the actual impact of defects is not comprehensive enough. In actual use, after flame cutting, welding and other processing for unqualified plates found by ultrasonic testing, some can achieve the intended purpose of use, while some will be along the thickness of the plate. The direct cracking in the direction will eventually lead to the scrapping of the workpiece. The reason for the above phenomenon may be that the specific types of internal defects of the material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
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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