00:54 Feb-07-2004 High sensibilty inspection of Ni-base forgings
Hello everybody ! I have a little question about the immersion UT inspection of powder metallurgy forgings (Ni base alloys). The required sensibility is FBHØ0.2mm at 80%FSH reject with a detection level at FBHØ0.14mm. - We use calibration block with FBHØ0.4mm in RENE88 or 95. Actually the settings give : - FBHØ0.2mm > 80% (that give a FBHØ0.4mm +12dB sensibility) - FBHØ0.14mm > -6.19dB of 0.2mm (39.2%) - using a -2dB beam diameter that gives a gate level at 31.13% (-2dB of 39.2%)to assume required detection level.
Can we work with FBHØ0.4mm at 80% FSH ? With : - FBHØ0.2mm > 20% - FBHØ0.4mm > 9.8% and a gate level of 7.7% with beam diameter -2dB.
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