Process of Heat-assisted Ultrasonic Additive Manufacturing of T2 Cu Foil
SANG Jian1, WANG Bo1,2,3, ZHU Xunming2, ZHANG Hongtao1,3, WANG Yunfeng2, JIN Wei1,2, GAO Binglu1,2,3, CHANG Qing1, HE Peng1
1 College of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209; 2 Weihai Wanfeng Magnesium S &T Development Co., Ltd., Weihai 264209; 3 Shandong Institute of Shipbuilding Technology, Weihai 264209
Abstract: The ultrasonic generator of 5 kW high power with double transducer push-pull roll welding head was used to make the ultrasonic incremental manufacturing of T2 Cu foil, and the external thermal field was provided by auxiliary heating device to make the heat distribution optimized in welding process. The influence of interface temperature on microstructure, mechanical pro-perties and fracture morphology of ultrasonic welding samples under different heating temperature and different welding pressure was investigated. The result implied that the solid phase bonding strength of the ultrasonic lap welding sample was best when the heating temperature was 100 ℃, which was 24.420 N/mm, and it increased first and then decreased with the increase of the interfacial temperature. At the same time, the plastic deformation in high frequency and dynamic recrystallization happened in the metal of ultraso-nic welding combined interface, and it appeared whirlpool and occlusion in the interface. The analysis of the peel interface morphology discovered that all the fracture mode of good bonding region are quasi-cleavage fracture.
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