2219铝合金厚板搅拌摩擦焊接温度场数值模拟  

Numerical simulation of thermal field of friction stir welded 2219 aluminum alloy thick plate

作　　者：徐韦锋[1] 刘金合[1] 朱宏强[1] 

机构地区：[1]西北工业大学材料学院,西安710072

出　　处：《焊接学报》2010年第2期63-66,78,共5页Transactions of The China Welding Institution

基　　金：中国机械工程学会焊接学会创新思路预研奖学金资助项目

摘　　要：通过已建立的数学模型利用ANSYS软件,对14mm厚2219铝合金搅拌摩擦焊接过程(搅拌头插入阶段和焊接稳定阶段)中的温度场进行数值模拟,并与在焊缝相应位置埋入热电偶检测结果进行对比分析.试验发现,搅拌头插入阶段焊缝的温度变化与焊接速度无关,开始阶段升温速率最大;焊接稳定阶段,沿板厚度方向呈现上宽下窄、上高下低的温度梯度分布趋势.两个阶段都是旋转频率越高,焊缝的峰值温度越高.结果表明,温度场模拟与试验检测结果基本吻合,数学模型正确.By means of an established three-dimensional heat finite element mathematical model and software ANSYS, the temperature distributions of friction stir welding process (the tool inserting and the stable welding stage) on 14 mm thick 2219 aluminum are calculated. Calculated results indicate that in the beginning of the stage, the variations in temperature have nothing to do with the welding speed and the biggest temperature rise rate presents; in the stable welding stage, the temperature gradient presents different distribution along thickness direction of the plate, which is wide and high at the top while narrow and low at the bottom; in both of stages, the more the rotary speed is, the higher the peak temperature of weld is. The temperature field simulation results are basically consistent with experimental results, which come to conclusion that the mathematical model is correct.

关 键 词：搅拌摩擦焊接 2219铝合金 温度场模拟 

分 类 号：TG453[金属学及工艺—焊接]