Theinitial step towards a nondestructive technique that estimates grain orientation in an anisotropic weld is presented in this paper.\nThe purpose is to aid future forward simulations of ultrasonic NDT of this kind of weld to achieve a better result. A forward model\nthat consists of a weld model, a transmitter model, a receiver model, and a 2D ray tracing algorithm is introduced. An inversion\nbased on a multiobjective genetic algorithm is also presented. Experiments are conducted for both P and SV waves in order to\ncollect enough data used in the inversion. Calculation is conducted to fulfill the estimation with both the synthetic data and the\nexperimental data. Concluding remarks are presented at the end of the paper.
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