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Metal Casting Technologies : Whos who September 2011
The fourth and the last step involved the developer application. Non-aqueous developer was applied by an aeroso spray to thoroughly drying the sample surface. Then the teste surfaces were tested by visual inspection and taking pictures f those surface for more investigation. Testing samples using ultrasonic testing. The initial step in the ultrasonic testing is to prepare the sample for testing by grinding its surface to have very smooth surface roughness up to 600 mesh. This step is necessary to make the movement of the testing probe on the tested surface very easy and smooth. The first step of ultrasonic testing (UT) is calibrating the testing instrument to make sure that readings are free of bias errors. Then the instrument settings are input, and the requirements of the test are set (Vl=6300, rang=20mm). The UT probe is inspected on the smooth surface of the sample part with 5Mhs frequency as shown in Figure 1. The probe is then scanned over the sample. Defects are shown as peaks in the frequency domain. As number of peaks is getting larger as number of defects are getting more. Short peaks indicates sample with close defects to the surface than peaks with bigger amplitudes. To compare the nine samples of different solidification rates, two locations were chosen on the samples These two locations are shown in Figure 2. Results of the nine samples are shown in Figures 3 and 4. Figure 1: UT probe testing using 5Mhs frequency Figure 2: The two locations where all the nine samples are tested by UT o ol dd fo or p pff s. e Foundry Investment Diecasting Offices: www.synchro32.com email@example.com +44 (0) 845 370 3232 ERP Cast Metal Specific Oct 9th- 12th Booth #113 30thOct -- 1stNov Booth#12 QueenstownNZ
Whos who September 2012