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UT 6dB Drop Defect Thru Wall Sizing 4 года назад


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UT 6dB Drop Defect Thru Wall Sizing

This video demonstrates how to measure the through wall dimension of a center line crack in a weld using an ultrasonic tester. This technique uses the 6dB drop method to size the vertical through wall of a crack. The defect signal is maximized and the transducer is moved in and out to walk the signal up and down until the signal drops by 50% FSH or 6dB. This will detect the crack tips. Equipment: Olympus EPOCH 1000i UT tester, GE 5MHZ, 0.25" diameter transducer with a 60 degree screw on wedge. I work at Central Piedmont Community College in Charlotte, NC. Please visit our website to explore your NDE training needs. Central Piedmont Community College NonDestructive Examination Technology Program https://www.cpcc.edu/programs/nondest... Central Piedmont Community College NonDestructive Examination Technology Program College Catalog http://catalog.cpcc.edu/programsofstu...

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