Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1669-1676.doi: 10.13229/j.cnki.jdxbgxb20190523

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Effect of welding energy on performance of Cu/Ti joints obtained by ultrasonic welding

Xiao-yan GU(),Cheng-long SUI,Xing DI,Zheng-yu MENG,Kai-xuan ZHU,Chang-chun CHU   

  1. College of Materials Science and Engineering，Jilin University，Changchun 130022, China
  • Received:2019-05-27 Online:2020-09-01 Published:2020-09-16

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Abstract:

The high-power ultrasonic spot welding machine was used to successfully weld T2 pure Cu and Ti6Al4V dissimilar metals. The effects of different welding energies on the interface temperature, cross-sectional macroscopic morphology, interface formation and mechanical properties of the joints were analyzed. It is shown that with the increase in welding energy, the peak temperature and high temperature residence time increase, the indentation depth increases gradually, the joint interface is flat and no intermetallic compounds appear, There is a diffusion layer with a maximum thickness of 2 μm at the interface. The tensile shear force gradually increases with the bonded area, and the maximum shear force is 2322 N. The joint fractures along the interface of the Cu side of the base material, and the fracture mode changes from brittle fracture to ductile-brittle mixed fracture. The stress analysis of the interface under different welding energies was carried out by using ABAQUS finite element numerical simulation software. The interface forming mechanism of Cu/Ti ultrasonic welded joints was systematically expounded.

Key words: materials synthesis and processing technology, ultrasonic welding, Cu/Ti dissimilar metal, welding energy, interfacial stress distribution

CLC Number: 

  • TG453

Fig.1

Ultrasonic metal welding machine and detailed knurl pattern of sonotrode and its dimension"

Fig.2

Rmocouple thermometer and temperature measuring position"

Fig.3

Schematic diagram of shear test fixture"

Fig.4

Thermal cycling curves at different welding energy"

Fig.5

Macro profiles of joint under different welding energy"

Fig.6

Microstructure of joints under different welding energy"

Fig.7

Stress distribution of joints in interface at different welding energy"

Fig.8

Results of EDS line scan analysis under different welding energy"

Fig.9

X?ray diffraction analysis of interface under 3000 J welding energy"

Fig.10

Shear force of joints at different welding energy"

Fig.11

Macroscopic fracture surface morphology of joints at different welding energy"

Fig.12

Fracture morphology of Cu side joints under different welding energy"

Fig.13

Surface scan of titanium side fracture at different welding energy"

Fig.14

X-ray diffraction analysis of fractures at 3000 J energy"

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