ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Ultrasonic pre-cladding and soldering for composite connecting of copper-aluminum bimetallic bearings
Received date: 2024-08-03
Revised date: 2024-08-31
Accepted date: 2024-10-09
Online published: 2024-11-07
Supported by
Study on Process Technology of Bimetallic Connection of Copper-Aluminum Bearings(（KJ）HFQT2305GCB001)
The Zn-6Al solder was used separately to ultrasonically pre-clad the aluminum alloy matrix and the copper alloy bushing surfaces to be connected. The connection of the bearing was achieved by secondary soldering after hot assembly. The interface microstructure of aluminum alloy and copper alloy after pre-cladding a solder layer as well as the microstructure of the joints after the secondary soldering were characterized and analyzed by scanning electron microscopy and energy spectrometry. Meanwhile， the effects of soldering holding time on the microstructure and mechanical properties of joints were investigated. The differences in the mechanical properties of the joints under two methods of ultrasonic pre-cladding and then soldering and direct ultrasonic-assisted soldering were comparatively investigated. Furthermore， the bonding rate of bearing specimens fabricated by ultrasonic pre-cladding and soldering composite connections was tested using a 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 holding time. When the soldering holding 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 using direct ultrasound-assisted soldering method， the shear strength of the joints initially increase and then decrease as the ultrasonic time increases. 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 shear strength of the joints was lower than the joints obtained by ultrasonic pre-cladding and then soldering. 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.
Na SONG , Jing LIU , Juhong QIE , Wei QIANG , Zhuolin LI , Suliu YI , Haoran WANG . Ultrasonic pre-cladding and soldering for composite connecting of copper-aluminum bimetallic bearings[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(8) : 431038 -431038 . DOI: 10.7527/S1000-6893.2024.31038
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