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Ultrasonic Multiple-Beam Technique for Detecting Cracks in Bimetallic or Coarse-Grained Materials

Abstract: 

A reliable ultrasonic method for testing inner diameter cladded pipe adjacent to welds comprising use of multiple beams, bands and pulses in addition to pulseshaping and beamforming, spectral and directional averaging, as well as spatial filtering and pattern recognition. An automated inspection mode aims short shear-wave pulses from different source locations and different beam orientations to detect signals characteristic of defects. A manual confirmation mode aims both longitudinal waves and shear waves at the suspected defect and analyzes the detected returned pulses by an associated pulse pattern recognition method.

Patent Number: 
4,435,984
Date Of Issue: 
03/13/1984
Inventors: 

George J. Gruber