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首页> 外文会议>European Conference Non-Destructive Testing >Ultrasonic Wave Propagation in Dissimilar Metal Welds - Application of a Ray-Based Model and Comparison with Experimental Results
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Ultrasonic Wave Propagation in Dissimilar Metal Welds - Application of a Ray-Based Model and Comparison with Experimental Results

机译：不同金属焊缝中超声波传播 - 基于射线的模型应用与实验结果

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Dissimilar Metal Welds (DMW) made of nickel based alloys are widely present in some nuclear power plants at the intersection between the main pipe lines and large components such as the pressure vessel, steam generators and pressurizers. Ultrasonic NonDestructive Testing techniques (NDT) are used in order to maintain the integrity of the primary circuit and detect defects such as Stress Corrosion Cracking (SCC). Nevertheless, disturbances such as beam splitting and skewing may occur due to the anisotropic and inhomogeneous properties of the welding material. These disturbances affect the detection, localization and sizing of possible weld discontinuities. Numerical simulation tools can help to understand these physical phenomena and optimize ultrasonic NDT. A novel ray tracing algorithm has been recently developed in the CIVA platform in order to evaluate the propagation of elastic waves in anisotropic and inhomogeneous media. Based on the solving of two systems of linear ordinary differential equations of the first order, this model allows the evaluation of the ray trajectories and the travel-time, and the computation of the amplitude along a ray tube and in its vicinity. In this approach, the considered medium has to be represented by a smooth description of the elastic properties. This paper presents the work made as part of a collaborative program between CRIEPI and CEA. The ray-based model has been evaluated on a DMW mock-up described thanks to a smooth description of the crystallographic orientation of its constitutive grains. Simulated results of the transmitted beam and the detection of notches located in the weld and the buttering have been compared to experimental measurements performed on this mock-up with phased-array probes.
机译：由镍基合金制成的不同金属焊接（DMW）广泛存在于主要管道线和压力容器，蒸汽发生器和压力机的大型部件之间的一些核电站。使用超声波非破坏性测试技术（NDT）以维持初级回路的完整性，并检测诸如应力腐蚀裂缝（SCC）的缺陷。然而，由于焊接材料的各向异性和不均匀性能，可能发生诸如光束分裂和偏斜的扰动。这些扰动会影响可能的焊接不连续性的检测，定位和尺寸。数值模拟工具可以帮助了解这些物理现象并优化超声波NDT。最近在Civa平台中开发了一种新的射线跟踪算法，以评估弹性波在各向异性和不均匀介质中的传播。基于求解第一阶的两个线性常微分方程系统，该模型允许评估光线轨迹和行进时间，以及沿线管和其附近的幅度计算幅度。在这种方法中，所考虑的介质必须通过弹性特性的平滑描述来表示。本文展示了作为CRIEPI和CEA之间的协作计划的一部分所做的工作。由于其组成颗粒的结晶取向的光滑描述，已经在描述的基于射线模型上描述的DMW模型。将透射光束的模拟结果和位于焊缝中的凹口检测和抛出的凹口与通过相控阵探针对该模拟进行的实验测量进行了比较。

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