The method of judging the segregation zone defect in the internal structure of the flat metal plate by the 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 Improve reliable predictability, rapid characterization, and provide efficiency and accuracy effects
Active Publication Date: 2021-08-17
HEBEI PUYANG IRON & STEEL
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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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[0028] Below in conjunction with embodiment the present invention is described in further detail:
[0029] The single crystal straight probe is used to determine the internal structure segregation zone defects of flat metal plates. The A-type pulse reflection ultrasonic flaw detector is selected, and the single crystal straight probe is used to detect the flaws of hot-rolled flat steel plates. According to the size, The different types of defects and the difference in the transmittance of ultrasonic reciprocating sound pressure can be directly compared and distinguished by 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 peak is used to characterize the defect site and determine whether the defect is a metal structure segregation zone. Such as figure 1 , 2 As shown, the judgment of defects needs to meet the following conditions at the same time:
[0030] a, the first fla...
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Abstract
The invention discloses a method for judging defects of segregation bands in the internal structure of a flat metal plate by a single crystal straight probe, which belongs to the field of ultrasonic flaw detection. An ultrasonic flaw detector with a single crystal straight probe is used to detect flaws in a hot-rolled flat steel plate, and by comparing the defects for the first time The height of the echo F1 and the peak of the first bottom echo B1 accurately characterizes the "discontinuity" inside the steel plate, and judges whether there is a "metal structure segregation zone" defect inside the steel plate.
Description
technical field [0001] The invention relates to the field of ultrasonic flaw detection, in particular to a method for judging metal structure segregation zone defects by using a single crystal straight probe, which is used for flaw detection of hot-rolled flat steel plates. Background technique [0002] At present, ultrasonic testing of hot-rolled flat steel plates with single-crystal straight probes can only determine, quantify and grade internal defects. 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 directly crack along the 1 / 2 of the thickness of the plate, that is, "partition". layer", which eventually leads to the scrapping of the workpiece. Consult the relevant European and American ultrasonic testing standards, and there is no clear description of the severity of the internal defects of the plate. 5.3.9.2 of the current NB / T47013.3-201...
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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