An ultrasonic methodology to non-destructively estimate the grain orientation in an anisotropic weld

SCeNDT/MMT, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

^a Corresponding author: hakan.wirdelius@chalmers.se

Abstract

The initial step towards a non-destructive technique that estimates grain orientation in an anisotropic weld is presented in this paper. The purpose is to aid future forward simulations of ultrasonic NDT of this kind of weld to achieve a better result. A forward model that consists of a weld model, a transmitter model, a receiver model and a 2D ray tracing algorithm is introduced. An inversion based on a multi-objective genetic algorithm is also presented. Experiments are conducted for both P and SV waves in order to collect enough data used in the inversion. Calculation is conducted to fulfil the estimation with both the synthetic data and the experimental data. Concluding remarks are presented at the end of the paper.