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Dry UT by guided shear horizontal using EMAT's

 
: Salzburger, H.-J.; Hübschen, G.; Niese, F.

International Committee for Non-Destructive Testing -ICNDT-; Canadian Institute for NDE:
16th World Conference on Nondestructive Testing 2004. CD of proceedings : Palais des Congrès, Montreal, Canada, August 30 - September 3, 2004
Montreal: Events International Meeting Planners, 2004
pp.TS3.24.1
World Conference on Nondestructive Testing (WCNDT) <16, 2004, Montreal>
English
Conference Paper
Fraunhofer IZFP ()
shear horizontal wave; ultrasonic testing

Abstract
Ultrasonic Testing (UT) is still concentrated on the 'classical' wave modes generated by piezoelectric probes. Other wave modes as the Shear Horizontal (SH) waves and the wide class of guided waves offer new solutions for UT not yet widely used due to the lack of availability of appropriate probes and equipments. EMAT's are the most far developed ultrasonic probes for UT using SH-waves and guided waves. Despite their limitations (efficiency, lift off-effect, frequency range etc.) they have the big advantage to perform dry UT. This contribution will present new solutions for UT of metallic parts using guided Shear Horizontal waves: for the in-line inspection for defects and weld geometry of butt welds, for crack inspection in gas pipelines, for screening UT for hidden corrosion in tubular goods, for long range inspection of pipes and for the inspection of multilayered aircraft components. The latest developments of the probe design are shortly reported. The equipments and their integration in production lines as well for in-service application are shown together with examples of inspection results during their practical applications.

: http://publica.fraunhofer.de/documents/N-27384.html