Evaluation of metal weld-zone by using Poisson’s ratio distribution

Poisson’s ratio has not received much attention because of its narrow range of measured values and difficulties in measurement. In previous work, genuine non-destructive evaluation method of characterizing weld-zone using Poisson’s ratio distribution was proposed. The method was to use immersion ultrasonic testing for measuring longitudinal and transverse wave speeds simultaneously. In present work, scanning results by focused transducer and normal transducer are compared. Focused transducer shows improved performance. We also compare the results by Poisson’s ratio scanning and direct Vickers hardness test.