7022铝合金搅拌摩擦焊接全过程温度场的数值模拟

Numerical Simulation of Temperature Field in the Full Friction Stir Welding Process for 7022 Aluminum Alloy

基于对搅拌摩擦焊接过程的划分以及相对应的热输入模型,建立了焊接全过程的温度场有限元分析模型;通过求解得到了搅拌头旋转压入阶段、初始焊接阶段、准稳态焊接阶段和焊接结束4个阶段的温度场分布,并进行了试验验证。结果表明:模拟得到的温度结果和通过热电偶法测得的温度结果比较吻合。

FEM analysis model of temperature field was built up based on the division of friction stir welding process and the corresponding heat input model. Through solving the established model, temperature field distributions of these four stages including the tool inserting welding, the initial welding, the stable welding and the end-up welding stage were obtained. And verification of FEM model was carried out by thermal couple test. Results show the simulation results of temperature were accorded with the experimental results basically.