Grain morphology and texture of welds significantly affect the properties of the corresponding joint. It is very important to determine how heat and grain growth during welding correlate. Our studies involved both experiments and multi-scale numerical modeling. The laser welding temperature distribution was studied by the macroscopic finite element method. The grain growth and morphology evolution under different heat input conditions were calculated by the Monte Carlo method at the mesoscale. The relationship between heat flow distribution and grain orientation was established. Results of electron backscattered diffraction (EBSD) were compared to those obtained by numerical modeling. The welding heat input affected the heat flow distribution and the shape of the molten pool, which, in turn, influenced grain morphology and crystal orientation.

焊缝的晶粒形态和织构会明显影响相应接头的性能。确定焊接过程中热量和晶粒的增长如何相关非常重要。我们的研究涉及实验和多尺度数值建模。用宏观有限元方法研究了激光焊接温度分布。通过蒙特卡罗方法在中尺度上计算了不同热输入条件下的晶粒长大和形貌演变。建立了热流分布与晶粒取向的关系。将电子背散射衍射（EBSD）的结果与通过数值模型获得的结果进行了比较。焊接热输入影响热流分布和熔池形状，进而影响晶粒形态和晶体取向。