通过7A52铝合金的搅拌摩擦焊试验,分析讨论了其焊接接头特征.试验中有目的地选择了几种不同的工艺规范进行研究.结果表明:焊接接头横截面宏观结构特征表现为焊核区的"洋葱环"和热-机械影响区的塑性流线变形,洋葱环的环间距随着距焊缝中心距离的增大而减小;表面的宏观结构特征表现为半圆环带,环间距与搅拌头旋转速度和焊接速度有关.此外,还讨论了搅拌头旋转速度和焊接速度对焊接接头力学性能影响.接头显微硬度的最低值出现在焊接热影响区而不在焊核区,主要是焊核区经过动态再结晶形成了细小的等轴晶所致.
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