Method for selecting and utilizing natural flaw rod as flaw detection test sample
A natural, bar technology, applied in the field of non-destructive testing of flaw detection samples, to achieve the effect of saving costs, high reliability of detection accuracy, and significant economic benefits
Inactive Publication Date: 2018-06-19
SHIJIAZHUANG IRON & STEEL
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Problems solved by technology
[0009] The technical problem to be solved by the present invention is to provide a method for selecting and using natural flawed rods as flaw detection samples. In this method, round steel rods with natural defects can be selected and used instead of artificially defective round steel rods as a detection comparison test. In this way, natural defects can be used to dynamically test the equipment, which can more accurately reflect the accuracy of the flaw detection equipment, make the detection accuracy more reliable, improve the quality of detection, and meet customer requirements
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[0033] The present invention is based on the detection accuracy setting provided by the flaw detection equipment manufacturer to detect the bar. When the round steel has a defect alarm signal, and the defect signal has just alarmed, the bar with the defect is retained and determined as the first sample 1; According to this method, another bar that has just alarmed is retained, and it is determined as the second sample 4, and the alarm amplitude and defect length of the first sample 1 and the second sample 4 are consistent. Then the defect 2 of the first sample was positioned, sawed and analyzed at high magnification, the depth 7 and length of the defect 2 of the first sample were measured, and the microscopic image of the defect 2 of the first sample was obtained. Then compare the defect depth 7 of the first sample with the precision set by the flaw detection equipment to determine the difference between the two depths. Then the second sample 4 is tested, and the accuracy of t...
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Abstract
The invention provides a method for selecting and utilizing a natural flaw rod as a flaw detection test sample and belongs to the technical field of nondestructive testing flaw detection test samples.An unprocessed natural flaw round steel rod is used for replacing a manually-processed flaw round steel rod and is used as a flaw detection comparing test sample. According to the technical scheme, the same flaw signal is used for comparing, and two flaws with a consistent equivalent signal are used as the same size; then one natural flaw is subjected to high-power measurement, so as to determinea real size of the natural flaw; the size is determined to be a standard precision sample rod of the sample rod, so that the aim of replacing manual flaws is realized. According to the method provided by the invention, the natural flaw is used for carrying out a dynamic test on equipment, the precision of flaw detection equipment is more accurately reflected and the detection precision stabilityis higher; meanwhile, the cost of surface flaw processing is saved. When finishing line eddy current testing equipment of certain steel enterprises utilizes a natural sample rod to carry out the dynamic test on the precision, the detection sensitivity is reduced by 3db and the flaw detection comprehensive yield is improved by 8 percent; quality objections of consumers are not caused due to misseddetection.
Description
technical field [0001] The invention relates to a method for using an unprocessed naturally flawed round steel bar instead of a manually processed round steel bar as a comparison sample for flaw detection, and belongs to the technical field of nondestructive testing flaw detection samples. Background technique [0002] The test and evaluation of comprehensive performance indicators such as detection accuracy, end blind area, and signal-to-noise ratio of round steel on-line surface flaw detection equipment are tested and evaluated by using standard samples with artificial defects of known size and position. [0003] The production and use process of artificial defect standard samples are as follows: [0004] 1. Select the round steel base material without surface defects, without bumps on the surface, the depth of natural defects is not greater than 0.1mm, the flatness is 2mm / m, and there is no iron oxide scale on the surface. [0005] 2. Use a special engraving machine to e...
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IPC IPC(8): G01N1/28
CPCG01N1/28G01N2001/2893
Inventor 周立波阎岩华祺年刘建培常鹏飞王会庆袁贝李竹军宋宽郭华鹏
Owner SHIJIAZHUANG IRON & STEEL