Non-destructive testing of sheet product inner surfaces using longtitudinal surface acoustic waves

Abstract

The paper presents experimental investigation results of nondestructive ultrasonic testing using secondary longitudinal surface waves (LSAW II). Analysis of real LSAW signals, generated and received by angle transducers, was performed and causes of lateral interference were investigated, optimal angle transducer constructions were offered. Real angle transducer parameters and levels of LSAW II signals, reflected from artificial defects in duralumin sample, were evaluated. It was concluded by experimental investigations that LSAW II signal magnitude and collateral interference level ratio reaches 24 dB. This gives opportunity to perform sufficiently reliable shell product inner surface nondestructive testing using secondary longitudinal surface waves.