采用Zn-6Al钎料,利用超声分别对铝合金基体和铜合金衬套待连接表面预熔覆钎料层，在热装配后进行二次钎焊，实现了轴承组件的连接。通过扫描电子显微镜及能谱仪对预熔覆钎料后的铝合金、铜合金界面微观组织以及不同二次钎焊时间后的钎焊接头界面组织进行了表征和分析，并探究了钎焊时间对接头力学性能的影响。对比研究了超声预熔覆-钎焊复合连接与直接超声辅助钎焊连接两种方法下接头力学性能差异。此外对通过超声预熔覆-钎焊复合连接制作的轴承试样，使用水浸超声C扫描系统检测接头焊合率。结果表明，预熔覆后的Al/Zn-6Al、Cu/Zn-6Al界面结合良好，且二次钎焊后形成了无明显缺陷、界面结合良好的Cu/Zn-6Al/Al接头。随着二次钎焊时间增加，接头抗剪强度下降，当钎焊时间为30 s时，接头最大强度达到135.8 MPa，断裂发生在接头组织中的CuZn5相处。然而，利用直接超声辅助钎焊连接时，随着超声时间增加，接头抗剪强度先升后降的趋势。当超声作用时间4 s时，接头最大强度达到65.9 MPa，断裂位置位于Cu5Zn8相与CuZn5相交界处。对比于超声预熔覆-钎焊复合连接的接头，其接头抗剪强度较低。此外经检测，通过超声预熔覆-钎焊复合连接的轴承试样的端面焊合率约为99.3%，孔内焊合率约为99.5%，且无贯穿性缺陷。

The bearing assembly was connected using the Zn-6Al solder, which was clad on the surface of the aluminum alloy matrix and copper alloy bushing by ultrasonic, respectively, and then soldered after hot assembly. After pre-cladding and soldering, the interfacial microstructure of aluminum and copper alloy was characterized by a scanning electron micro-scope and energy spectrometer. With different secondary soldering times, the interface microstructure of joints was ana-lyzed, and the effect of soldering time on the mechanical properties of joints was investigated. The differences in the me-chanical properties of the joints under two methods of ultrasonic pre-cladding and then soldering and direct ultrasonic-assisted soldering were investigated comparatively. In addition, the bearing specimens fabricated based on this method were tested for bonding ratio by the water immersion ultrasonic C-scan system. The results indicated good bonding of the Al/Zn-6Al interface and Cu/Zn-6Al interface after pre-cladding, and the Cu/Zn-6Al/Al joints with no obvious defects formed after secondary soldering. The shear strength of the joint decreased with the increase of the secondary soldering time. When the soldering time was 30 s, the maximum strength of the joint reached 135.8 MPa, with fracture occurring in the CuZn5 phase of the joint. However, when joining using direct ultrasound-assisted soldering method, the shear strength of the joints tended to increase and then decrease with increasing ultrasound time. When the ultrasonic action time was 4 s, the maximum strength of the joint reached 65.9 MPa, with the fracture location located at the junction of the Cu5Zn8 phase and the CuZn5 phase. The joint shear strength was lower in comparison to the joints that were ultrasonically pre-cladded and then soldered. In addition, the bearing specimens connected by ultrasonic pre-cladding and then soldering had a weldability of about 99.3% on the end faces and 99.5% in the holes, with no penetrating defects.