J0406-2-1 Simulation of ultrasonic wave propagation in dissimilar metal welding part with image based EFIT

Abstract

The ultrasonic testing (UT) for an austenitic steel with welds is difficult due to the acoustic anisotropy and local heterogeneity. The ultrasonic wave in the austenitic steel is skewed along crystallographic directions and scattered by weld boundaries. For reliable UT, a straightforward simulation tool to predict the wave propagation is desired. Here a combined method of elasto-dynamic finite integration technique (EFIT) and digital image processing is developed as a wave simulation tool for UT. In our simulation, a picture of the surface of the steel bar with a V-groove weld is scanned and fed into the image based EFIT modeling. An example of a two dimensional simulation of a phased array UT in an austenitic steel bar is demonstrated.