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Ultrasonic sampling phased array testing as a replacement for X-ray testing of weld joints in ship construction
Miscellaneous problems in maritime navigation, transport and shipping : Marine navigation and safety of sea transportation; TransNav 2011Symposium held at the Gdynia Maritime University, 15.-17.06.2011, Gdynia, Poland
Boca Raton, Fla.: CRC Press, 2011
ISBN: 978-0-203-15704-6 (eBook)
|International Navigational Symposium on Marine Navigation and Safety of Sea Transportation (TransNav) <9, 2011, Gdynia>|
|Fraunhofer IZFP ()|
| x-ray; ultrasonic testing; sampling phased array|
According to European Standard EN 1712 ultrasonic testing of thin-walled welded joints is mandatory for wall thicknesses of more than 8 mm only. Any thinner components do have to undergo X-ray inspection. Besides various advantages of X-ray testing viz. high sensitivity to smallest inclusions, high acceptance in the ship building sector and "automatic" documentation of inspection results, there are also several deficiencies (like radiation protection issues, inspection time expenditure etc.) creating a reasonable request for more cost-effective alternatives. Sampling Phased Array technology introduced by Fraunhofer-IZFP provides significant improvement of flaw detectability also in thin-walled welded joints due to its tomographic approach in processing of signals ob-tained by ultrasonic phased array transducers. It allows high-quality imaging of welded joints and detection of relevant material flaws. Real-time ultrasonic imaging with tomographic quality offers a greatalternative to X-ray testing with respect to inspection speed and modern documentation of inspection results. The basic principles of Sampling Phased Array are presented in the paper and several application results ob-tained on welded joints of marine objects are presented.