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 Wysłany: Sob 5:45, 15 Sty 2011 Temat postu: ugg italia P-wave plate and defect detection metho |
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P-wave plate and defect detection method to determine wave painting discussion
Various echo how the relative position will be a small defect in the direction of plate thickness on the location decision. When a small flaw right in the middle of plate thickness, the defect wave wave and the end location of the multiple echoes as shown in Figure 1 (b) shows that the defects in the even echoes (such as F., F,[link widoczny dla zalogowanych], F. ... ... ) will return the end of wave B, B,[link widoczny dla zalogowanych], B. ... ... Overlap; when small defects in the middle of plate thickness depends on, in the end of each wave should be at least twice before the defect wave; when small defects in the middle of plate thickness on the lower, in the end of each wave defect wave once before, but the increase in the number of echoes, the end of wave front in a two defects occur wave phenomenon. Figure 2. Actual operation, a small defect on the plate is the case, to determine which is the defect wave wave,[link widoczny dla zalogowanych], which is the end of a wave wave, once you have bit the end of wave (c) small defects in the plate ring 2 position, the detection of different waveforms circles indicate 32 No. 5 May 2008 1O NDT NDTVo1.32NO. 5October. 2008 Cuan Juan barrier is to shake the mouse to avoid the guillotine in the Po Kui Hong h. Kai Zhang Ning Exhibition Red - (1. Shanghai Baosteel Industrial Testing Company, Shanghai 201900, China; 2. Institute of Materials Science and Engineering, Tongji University, Shanghai 200092, China) Abstract: The leakage of the factory took over the mill spindle to detect security analysis to ultrasonic testing cracks dedicated track development process, monitoring the safety to take over the special structure of the welding quality, accurate and reliable data to guide the weld repair and the repair process with the crack detection scarf patch until 3 months after the normal maintenance of the replacement of the parts. This case can be confirmed by ultrasonic detection technology to track security flaws to take over the crack is a suitable, accurate and efficient method. Keywords: crack; ultrasonic testing; waveform; amplitude Key words: TG115.28 Document code: B Article ID :1671 -4423 (2008) 05-40-031 Introduction to Security took over the key components of the spindle mill ( Figure 1), the factory took over the spindle end face leakage security, when no spare parts available for replacement. Taking into account the cut-off will be a huge loss, the relevant departments to make a \key times, based on accurate and reliable data, the plant took over the fast on the smooth conduct of the scarf patch repair 3 times, so that the parts continue to be used for three months, until the normal maintenance of the replacement of new equipment, spare parts. Security took over the new parts shown in Figure 2. A former times the safety loop 1 mill spindle position to take over security took over the new parts in Figure 2 to take over the structural safety of 2 to take over security from the inside and outside the tube welded components made of 35CrMo forgings, took over the outer diameter of 1530mm. The wall thickness of about 14mm, the outer cylinder home features, identify the bottom echo and multiple echoes, we can easily determine the defect wave. If necessary, move the probe plate defect-free area,[link widoczny dla zalogowanych], to help determine the location of the end of wave. Figure 3 is testing some teaching materials in the description sheet is drawn when the superposition effect diagram. Based on the above analysis, the figure of the painting there is also wrong. Defect wave should appear in what position, it should be considered in a small defects in the plate depending on the specific location, not shown, as defects in both wave and the end of wave phase,[link widoczny dla zalogowanych], the location is relatively fixed. Superposition effect of circle 3 produces a waveform diagram when the total thickness in the <20mn2 plate testing, due to superposition effects occur, the general requirements under F. Evaluate the defect wave, which is to reduce the impact of near-field zone. However, in practice, F. May not appear in the icon location. Therefore, I believe that this sentence should be interpreted as: according to the end of wave B and the B. Defects between the first wave of an evaluation, not necessarily according to F. For defect evaluation. But this is not very strong operational, while the location of near-field region depends on the frequency of the probe, the chip size and specimen speed of sound. Of the total thickness <20mm plate in the case of variable depth defects, according to F: to evaluate the defect wave, it is impossible to reduce the impact of near-field region, so I suggest in this case, a better approach is to using other methods such as double crystal probe and flood wave detection method to accurately assess the plate in the defect. The situation in other industries, there are also some materials have a certain universality, I believe that the time may be in order to facilitate the preparation of drawings, ignoring the difference with the actual situation. So I hope that during training, the instructor can give students the correct interpretation, in order to correctly understand and master the relevant student knowledge, and better detection performance of duties to ensure the test quality.
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