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 Wysłany: Pią 13:15, 14 Sty 2011 Temat postu: moncler günstig Online through the eddy current t |
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Online through the eddy current testing the application on the seamless
Eddy current exploration area could end the tube is essentially not the length of the first exploration area (tail) and the human ability to distinguish the distance between work-related injuries. There are two major factors: First, testing speed, and second, the signal maximum and the head and tail injury could significantly distinguish between the signals. On-line eddy current inspection system length is not greater than 16Omm, YB/T4083 standards require no more than 200mm, to meet the requirements. 3.7 Eddy current testing equipment in the stability of long working hours, due to various reasons, all technical parameters are changing, people often call this change to \assessment work on the stability of the equipment is important, it can be measured throughout the working hours of product quality and reliability of detection. Vortex line 2h of continuous work the whole system, the index volatility is less than 2dB,[link widoczny dla zalogowanych], meet the requirements provided by YB/T4083. 4, defect detection and identification of artificial defects of the coil impedance can be seen as the conductivity and geometry of the combined result of two parameters. Therefore, it should be between the direction of the effect of electrical conductivity between the effect and the diameter d effect. Tube defects in the actual testing appear to be random, for defects (such as outside the fold, scarring, concave,[link widoczny dla zalogowanych], tearing, etc.) the location,[link widoczny dla zalogowanych], depth and shape of the defects produced by the combined effects of effect is difficult to theoretical calculations. Detection can only be collected in the actual effects of different defects, showing different results. Table 12003 in 6 months to October a list of unit testing conditions: (sticks) month attained a cell volume / t) failure causes scarring of the concave outer flaw tear off scratch accumulated other 62571903.5O194302161071515583.83l32701350898052772.8310812303907992493333.6O95104101294010109351791.648569130120 340,759,372.75320366114833717 to Angang 6 October in a factory-line eddy current non-conforming product as an example (see Table 1), testing the defects found mainly outside the scarring, concave, tearing, folding outside, scratches. These defects were the most prominent feature was the appearance of points, blocks, and steel have a certain axial angle, intermittent, the radial distribution rules, flaw depth or near the surface of steel lead angle is small, on-line through the eddy current the defect detection system distortion signal generated by a big margin, and the phase angle difference with the noise signal is large (Figure 2), defects easy to drown the signal,[link widoczny dla zalogowanych], the system can easily identify the alarm detection. For some were longitudinal, continuous, smooth transition of plane defects, such as straight, hair pattern, within the fold, the distortion signal is weak vertical scratches, not easy to keep No. 1 Zhang Yong et al: online through the eddy current testing the application on the seamless 39 detection alarm. Eddy current defect sub-elected, due to technical limitations, the qualitative analysis of the defects can not only distinguish defects in the nature of the artificial eye. Anshan Iron Mountain seamless line eddy current inspection system factory defect detection products, the manual inspection defect rate of false positives below 1.5. 9 | i ~ l7U. ',, \ A' circle of 25 concluded in a plant using online through the Anshan Iron and Steel-type eddy current testing system were detected in the past year, over 60,000 steel tube, fluid pipe inspection products, low pressure boiler tubes, oil pipes and other products throughout the the country. Practice has proved that online eddy current testing is an advanced non-destructive testing method, which has a high temperature, fast, online testing and other features,[link widoczny dla zalogowanych], and can be networked, image memory, storage, counting, statistics, printing, seamless steel tube production line to meet the operational requirements for modern production. References: [1] Yang Shiwei. Eddy current nondestructive testing. Liaoning Education Audiovisual Publishing House, 1998 [2] Chen Jin, Ma Dongling. NDT personnel training materials [3] YB/T4083-2000 steel automatic eddy current flaw detection system performance test methods (continued from page 27) a small peak in the pulse envelope to move, to rise gradually from zero to maximum amplitude and then down to zero, the random fluctuation of signal amplitude (≥ ± 6dB). This is a rough irregular oblique incidence reflector waveforms, shown in Figure 5. Transfer music f \ kJ dust Jil;, circle 5 tilt Regulation of incident is not just the wave reflector ■ b5.4 probe wave Ⅳ detect defects in different locations, the screen display a group of intensive Echo, the probe is moved back to wave after another, the peaks and valleys, if distinguished, each separate echo signals show the characteristics of wave I, which is defect-intensive dynamic waveform generated by the reflection, as shown in Figure 6. hlJ ~ t wave 1 stitch degree Kui him: quiet \ / fr: / -] Ll
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