NDTnet - March 1997, Vol.2 No.03

Ultrasonic Applications Highlights - Part 2

For this edition of "the echo 34" a wide range of test problems, processed by Krautkraemer's applicaction laboratory, has been selected. Here the main emphasis is on immersion testing with scan presentation.
This series was first published in the Krautkraemer Company Journal "Echo" beginning with Issue No.32 in 1986. We think that it is still a valuable source and we will continue with excerpts from Issues 33, 34, and 35. The instruments mentioned here are Krautkraemer products, many still in use today. For information on the latest models, please contact Krautkraemer.

UTonline would like to continue this series as a so called
"Readers' UT Applications". We invite readers to submit brief application descriptions to Rolf Diederichs .

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No.Test problem Brief description
Test method (Instrument/probe)
1.Recording of hydrogen induced cracks in steel. Immersion technique, meander scanning, C-scan recording of echo amplitude or time of flight (Microscan, USIP 12).
2. Measurement of crack propagation; tension crack corrosion on aluminum (Al) Immersion technique, water delay is selected so that the focal point is in the crack, C-scan recording on parallel lines (Microscan, USIP 12).
3. Testing diffusion welds on aluminum (Al) or iron (Fe) Immersion technique, meander scanning, C-scan recording of the interface echo (Microscan, USH 100, USIP 12).
4. Examination of the round fillet weld on track roller holders. Immersion technique, meander scanning, C-scan recording of the interface echo (TTWK tank, USIP 12).
Determination of damage caused by impacts on CFRP plates. Immersion technique, meander scanning, C-scan recording of the echo amplitude or time of flight (TTWK tank, USIP 12).
6. Testing the bonding between copper (Cu) and ceramics. Immersion technique, meander scanning, C-scan recording of reference flaw echo or of interface echo (Microscan, USIP 12).
7. Determination of the weld depth on an aluminum radiator. Direct contact with special probe, evaluation of the echo height coming from the remaining gap (USM 3).
8. Testing of spot welds on steel plates. Direct contact with special probe, length evaluation of the echo sequence from the total thickness as well as the amplitude of intermediate echoes (USIP 12, USD 10).
9. Testing of plastic (polyurethane) parts for shrink holes. Water sink, rotating arrangement for parts, evaluation of the echoes coming from shrink holes (USK 7S).
10. Testing fiberglass-reinforced plastic for laminar defects and measurement of the wall thickness.
d           Probe      Instrument
0.5-3   CLF 1, CLF 4   USM 3 S
3-15    H2K, H2N*)     USM 3 S
10-30   G1 N*)         USM 3 S/USL 33
*) with perspex delay line
11. Depth measurement of internal artificial flaws in boiler tubes. In wall thickness measurement of the tube next to the notch and above the notch, an oscilloscope in addition is useful (CL 304).
12. Thickness measurement on plastic foils. Measurement with a special probe in direct contact, display of the difference between the length of the delay path alone and the delay path extended by the foil (CL 304)
13. Ultrasonic Testing of Welds on Chain Spreaders On account of the complicated geometry of the weld an ultrasonic test was not possible with just one probe. Detection was only successful with a "squint" arrangement of two miniature probes (Krautkrämer type K5K, 5 MHz) under 70°. More details
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Echo 34 was edited by U. Huhn, W.-D. Kleinert, R. Krause, H. Neuhaus
The Echo is published free of charge at various intervals and is produced by:
Krautkrämer GmbH Co.
Robert-Bosch-Str. 3
P. 0. Box 13 63 D-50354 Hürth
Phon: +49-2233-6010
Fax: +49-2233-601402
E-Mail: 100656.65@compuserve.com
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© Copyright 1. March 1997 Rolf Diederichs, info@ndt.net
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