期刊
MATERIALS
卷 10, 期 2, 页码 -出版社
MDPI AG
DOI: 10.3390/ma10020193
关键词
ultrasonic welding; copper; plastic deformation; wavy interface
类别
资金
- National Natural Science Foundation of China [51175184, 61603103]
- Natural Science Foundation of Guangdong Province [2014A030313616]
- Science and Technology Planning Project of Guangdong Province [2015B010101015]
The effects of welding energy on the mechanical and microstructural characteristics of ultrasonic-welded pure copper plates were investigated. Complex dynamic recrystallization and grain growth occurred inside the weld zone during ultrasonic welding. At a low welding energy, a thin band of straight weld interfaces was observed and had an ultra-fine grain structure. With an increase in welding energy, the weld interface progressively changed from flat to sinusoidal, and eventually turned into a convoluted wavy pattern, bearing similarities to shear instabilities, as observed in fluid dynamics. The lap shear load of the joints initially increased and then remained stable as the welding energy increased. The tensile characteristics of the joints significantly depended on the development of plastic deformation at the interface. The influence of the microstructure on the hardness was also discussed.
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