The knowledge of grain growth directions makes it possible to describe the material anisotropy, which helps to ensure the ultrasonic testing of welded assemblies and the assessment of their mechanical integrity. Here, we study multipass welds made of 316 L stainless steel manufactured by a Gas Tungsten Arc Welding (GTAW) process. We have developed a specific model to predict the grain growth directions using a phenomenological solidification model relevant for GTAW welds. This new model follows the philosophy of the MINA model, developed since 2000 and which predicts the grain growth directions for Shielded Metal Arc Welding (SMAW) multipass welds, taking into account information from the welding notebook and macrograph analysis. Unlike the MINA model, the new model does not require measurement of the remelting parameters on macrographs, which can be complex to perform. These parameters are calculated from the measurement of dimensions on associated beads on plate. In this paper, the development of this new model is presented and the results are shown.

中文翻译：

---

预测 GTAW 焊缝宏观结构的真实模型，用于模拟超声波无损检测

晶粒生长方向的知识使得描述材料各向异性成为可能，这有助于确保焊接组件的超声波检测及其机械完整性的评估。在这里，我们研究了采用气体钨极电弧焊 (GTAW) 工艺制造的 316 L 不锈钢制成的多道焊缝。我们开发了一个特定的模型来使用与 GTAW 焊缝相关的现象凝固模型来预测晶粒生长方向。这个新模型遵循自 2000 年以来开发的 MINA 模型的理念，该模型预测了屏蔽金属电弧焊 (SMAW) 多道焊的晶粒生长方向，同时考虑了焊接笔记本和宏观照片分析中的信息。与 MINA 模型不同，新模型不需要在宏观照片上测量重熔参数，执行起来可能很复杂。这些参数是通过测量板上相关珠子的尺寸来计算的。在本文中，介绍了这种新模型的开发并显示了结果。