采用异种铝合金交替排列的方法,研究了搅拌摩擦焊接过程中材料的变形和流动行为.结果表明:采用垂直焊缝交替排列的焊缝表面形成了两套弧纹,其中粗大弧纹是由于在焊接方向上两种铝合金交替排列而产生的周期性变化所致;受焊速和转速的影响,材料在前进侧流动剧烈且混合均匀,而后退侧因材料流动较弱仍与母材保持连续分布状态;由于材料塑性变形程度的差异,在轴肩影响区、搅拌针影响区和母材之间形成了明显的分界面.
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