2A14-T6铝合金搅拌摩擦焊温度场及黏流层数值模拟分析

摘要

针对2A14铝合金搅拌摩擦焊过程,基于CEL数值模拟方法,采用Pressure Independ Multiyield Material模型,进行了不同搅拌头旋转速度与焊接速度条件下温度场有限元模拟分析.根据温度场分布分析了不同工艺条件下搅拌头前端黏流层厚度变化规律.依据搅拌摩擦焊过程中流变层工艺要求与黏流层模拟厚度,预测了不同工艺条件下的焊接质量,进而提出了2A14铝合金搅拌摩擦焊工艺参数控制准则.%Basing on the CEL numerical simulation method, adopted by Pressure Independ Multiyield Material model, the welding temperature field for friction stir welding (FSW) process of 2A14 aluminum alloy at different rotating speeds and welding speeds was simulated by finite element method. According to the temperature distributions, the varia-tion rule of pre-molten viscousness layer at the front of the rotating tool was analyzed. Compared the requirement of rheo-logical layer with simulated thickness of pre-molten viscousness layer, joint quality under different welding parameters was predicted. Therefore, the reference of process parameters selection for 2A14 aluminum alloy FSW was proposed.