Dense continuous oxide layers of semi-solid Al6061 complicate joints; therefore, ultrasound is introduced to break the continuous oxide layer. In this study, stacked semi-solid Al6061 samples were compressed with the application of ultrasound at the semi-solid metal formation temperature. The distribution of oxide layer and the shear strength near the bonding surface were used to analyze the connection effect of the interface. Results indicate that the continuous oxide layer can be broken by ultrasound and bonding strength can be improved. Compared with the sample simply processed with thermo-compression, the ultrasound-affected sample (100-ms working cycle, 10-ms operation period in each cycle, and 2.4-kW operation power) shows a 310% increase from 10.1 to 41.4 MPa in shear strength of the interface between semi-solid samples and a 29.7% reduction from 0.976 to 0.685 in oxide continuity degree. The results of this study can be applied in the additive manufacturing of semi-solid Al6061.

半固态 Al6061 致密的连续氧化层使接头复杂化；因此，引入超声波来破坏连续的氧化层。在这项研究中，堆叠的半固态 Al6061 样品在半固态金属形成温度下使用超声波进行压缩。通过氧化层的分布和结合面附近的剪切强度来分析界面的连接效果。结果表明，超声可以破坏连续的氧化层，提高结合强度。与简单热压处理的样品相比，超声影响样品（100 ms工作周期，每个周期10 ms运行周期，2.4 kW运行功率）在10.1至41.4 MPa的时间内增加了310％。半固体样品与 29. 之间界面的剪切强度。氧化物连续性从 0.976 降低至 0.685，降低 7%。该研究结果可用于半固态Al6061的增材制造。