The present investigation is concerned with high‐cycle axial fatigue testing of a 2‐mm AA6060‐T6 hybrid metal extrusion & bonding (HYB) butt weld produced in the solid state using AA6082 filler metal addition. The results complement the three‐point bend testing and the tensile testing done in two previous studies. In this study, optical microscope and scanning electron microscope examinations have been carried out to reveal the joint macro/microstructure and document possible surface and root defects deemed to affect fatigue life. In the as‐welded condition, the HYB weld suffers from surface irregularities at the weld face and ‘kissing’ bond formation in the root region. Despite of this, the subsequent testing shows that the fatigue properties exceed those reported for comparable AA6082‐T6 gas metal arc butt welds and matching those reported for corresponding high‐strength laser beam and friction stir weldments.

中文翻译：

---

混合金属挤压与粘接制成的AA6060-T6对接焊缝的疲劳性能

本研究涉及使用添加的AA6082填充金属以固态生产的2毫米AA6060-T6混合金属挤压和粘结（HYB）对接焊缝的高循环轴向疲劳测试。该结果补充了先前两项研究中进行的三点弯曲测试和拉伸测试。在这项研究中，进行了光学显微镜和扫描电子显微镜检查，以揭示关节的宏观/微观结构，并记录可能影响疲劳寿命的可能的表面和根部缺陷。在焊接状态下，HYB焊缝在焊缝表面会出现表面不平整，在根部会形成“吻合”键。尽管这样，