2024铝合金板搅拌摩擦焊接塑性材料流动的可视化检测与数值模拟

摘要

Thin copper sheets as marker material were embedded into weld path of 2024 aluminium alloy plates and their final position after friction stir welding was examined by metallographic techniques.Referring to the visualized material flow patterns,a three-dimensional model was developed to conduct the numerical simulation of the temperature profile and plastic material flow in friction stir welding.The calculated velocity contour of plastic flow in close proximity of the tool is generally consistent with the visualized results.As the tool rotation speed increases at a constant tool travel speed,the material flow near the pin gets stronger.The predicted shape and size of the weld nugget zone match with the experimentally measured ones.%将薄铜片作为标示材料镶嵌于2024铝合金板中,经搅拌摩擦焊接焊后,用金相法观察其最终位置.参考材料流动的可视化实验结果,建立搅拌摩擦焊传热与材料流动的三维数值分析模型.搅拌针附近塑性材料流动速度分布模式的计算结果与可视化实验结果基本一致.当焊接速度一定时,随搅拌针旋转速度的提高,搅拌针附近塑性材料流动加剧.焊核区形状与尺寸的计算结果与实测数据吻合.