Recent advances in feature extraction techniques being developed for ultrasonic examination of austenitic stainless steel welds

Conference · Tue Aug 01 04:00:00 EDT 1978

DOI:https://doi.org/10.1117/12.956751· OSTI ID:6527284

Mech, S. J.; Emmons, J. S.; Michaels, T. E.

Techniques are described which are being developed to characterize the features found during ultrasonic examination of stainless steel welds which are indicative of defects. Ultrasonic waveforms obtained from both defects and grain boundaries have similar time-domain characteristics. This phenomenon, together with variable signal attenuation and dispersion, is commonly encountered. The problem is to develop feature extraction techniques which will enable the examiner to discriminate realiably between weld defect signals and the other noise. Techniques presented use both time and frequency domain algorithms. The use of these techniques has demonstrated significantly better discrimination than conventional ultrasonic methods.

• Research Organization: Hanford Engineering Development Lab., Richland, WA (USA)
• DOE Contract Number: EY-76-C-14-2170
• OSTI ID: 6527284
• Report Number(s): HEDL-SA-1521; CONF-780829-1
• Country of Publication: United States
• Language: English

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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
220600* -- Nuclear Reactor Technology-- Research
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ACOUSTIC TESTING
ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
EPITHERMAL REACTORS
FAST REACTORS
FFTF REACTOR
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIQUID METAL COOLED REACTORS
MATERIALS TESTING
NONDESTRUCTIVE TESTING
PIPES
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RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SODIUM COOLED REACTORS
STAINLESS STEELS
STEELS
TEST REACTORS
TESTING
ULTRASONIC TESTING
WELDED JOINTS