A novel approach for the reconstruction of an equivalent volumetric heat source from a known weld pool shape is proposed. It is based on previously obtained weld pool geometries from a steady-state thermo-fluid dynamics simulation. Hereby, the weld pool dimensions are obtained under consideration of the most crucial physical phenomena, such as phase transformations, thermo-capillary convection, natural convection, and temperature-dependent material properties. The algorithm provides a time and calibration efficient way for the reproduction of the weld pool shape by local Lame curves. By adjusting their parameters, the identification of the finite elements located within the weld pool is enabled. The heat input due to the equivalent heat source is assured by replacing the detected nodes' temperature by the melting temperature. The model offers variable parameters making it flexible and adaptable for a wide range of workpiece thicknesses and materials and allows for the investigation of transient thermal ef...

中文翻译：

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用于评估锁孔模式焊接工艺中 3D 温度分布的 Lamé 曲线近似

提出了一种从已知熔池形状重建等效体积热源的新方法。它基于先前从稳态热流体动力学模拟中获得的焊池几何形状。因此，在考虑最关键的物理现象（例如相变、热毛细管对流、自然对流和与温度相关的材料特性）的情况下获得焊池尺寸。该算法为通过局部 Lame 曲线再现熔池形状提供了一种时间和校准有效的方法。通过调整它们的参数，可以识别位于熔池内的有限元。通过用熔化温度代替检测到的节点的温度来确保由等效热源引起的热量输入。