Abstract In this study, dissimilar butt joining of 6061 aluminum alloy and commercially pure copper via friction stir welding was performed with varying tool offset value. The mechanical properties were compared using transverse tensile testing. It was found that as the tool offset decreased from a position of 2 mm–0 mm, the ultimate tensile strength of the welded joint increased, and then decreased drastically when the offset was more than 1.6 mm. X-ray tomography results showed that an effective mechanical interlocking structure was formed with a chaotic interface along the joint line. In addition, in-situ tool temperatures measurement showed that the stir zone peak temperature was highly dependent on tool offset.

中文翻译：

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刀具偏置对Al/Cu搅拌摩擦焊接头组织和力学性能的影响

摘要 在这项研究中，6061 铝合金和商业纯铜通过搅拌摩擦焊进行异种对接，并使用不同的刀具偏置值进行对接。使用横向拉伸试验比较机械性能。发现随着刀具偏移量从 2 mm 到 0 mm 的位置减小，焊接接头的极限抗拉强度增加，当偏移量大于 1.6 mm 时急剧下降。X射线断层扫描结果表明，沿关节线形成了具有混沌界面的有效机械互锁结构。此外，现场工具温度测量表明搅拌区峰值温度高度依赖于工具偏移。