对板厚3mm的6061-T4铝合金T型接头进行搅拌摩擦焊接研究并具体讨论了旋转速率(ω)及焊接速率(ν)对焊接缺陷及力学性能的影响.结果表明:对给定的夹具形式和搅拌工具,当ν不变时焊缝前进侧筋板圆角过渡处容易产生随ω/ν增大而减小的隧道缺陷,后退侧圆角区易出现清晰的“Z”连接线；壁板出现两个随ω增大而扩大的软化区域,而壁板焊缝中心的硬度随ω增大而升高；T型接头筋板焊缝热力影响区同样被软化,其硬度较母材降低17.0％；局部组织软件是造成所有接头沿壁板方向加载抗拉强度下降的重要原因,其最高抗拉强度只达到母材的73.8％,隧道缺陷是引起ω=1008r/min筋板方向强度降低的主要原因,而ω=1541r/min和ω=2256r/min筋板方向强度降低主要归结于T型接头中热力影响区组织的软化,其中当ω/ν=1541/218 r/mm时,沿T接筋板方向抗拉强度最高可达到母材的83.5％.
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