Abstract
In this paper, a receiver model for ultrasonic ray tracing simulation is described. This is a complementary part of an existing simulation model and is the next step towards a numerical solution to the inverse problem and thus a NDT methodology for characterization of the dendrite orientation in a weld. The establishment of the receiver model is based on the electromechanical reciprocity principle. A concise retrospect of the weld model and the 2D model is made. The reciprocity principle is applied in an original way to handle the model problem including the back wall. Experimental qualitative validations for both P and SV waves on a specific weld are also made for C-scans included in this paper. Two different cases are studied. The first is a direct incidence of an ultrasonic ray towards the weld, and the second is a reflection from the back surface in the base material followed by an incidence to the weld. Even though mode-converted rays are excluded in the simulations, both the P and SV probe-models show the same behavior as the experimental results. The qualitative validation though reveals that it even if a thorough time-gating of received information would enable exclusion of mode-conversion in the model, inaccuracy of experimental results is affecting the evaluation of the weld model.
Highlights
In-service inspection of components that includes welds in austenitic stainless steel and Inconel metal has revealed systematic faults that are due to unpredictable paths of the ultrasound in the welded material
How to cite this paper: Liu, Q., Persson, G. and Wirdelius, H. (2014) A Receiver Model for Ultrasonic Ray Tracing in an Inhomogeneous Anisotropic Weld
Mode conversion is neglected in this 2D ray tracing model, which means that only waves of a single type are followed continuously
Summary
In-service inspection of components that includes welds in austenitic stainless steel and Inconel metal has revealed systematic faults that are due to unpredictable paths of the ultrasound in the welded material These welds exhibit highly anisotropic behavior and involve inhomogeneous ultrasonic properties. (2014) A Receiver Model for Ultrasonic Ray Tracing in an Inhomogeneous Anisotropic Weld. Well defined anisotropy in the simulated volume is prerequisite in order to make simulations of the forward problem, i.e. ultrasonic inspection of an anisotropic weld The framework of such an initiative consists of a weld model, a forward 2D ray tracing model, experiments and an inverse problem solver. Gueudre et al [14] have created a model by considering the welding process In their models, the grain’s orientation at different positions is decided by several parameters such as the chamfer geometry, the number of passes and the diameter of electrodes.
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