Microstructure and Mechanical Properties of an Ultrasonic Spot-Welded Aluminum-to-Aluminum Joint: Response to Interlayer Thickness

作者：Ni, Zeng-Lei^*; Ye, Fu-Xing

来源：Materials, 2019, 12(3): 369.

DOI：10.3390/ma12030369

• aluminum
• ultrasonic spot welding
• particle interlayer thickness
• mechanical property

To enhance the mechanical strength of an ultrasonic spot-welded Al/Al joint, an Al 2219 particle interlayer was placed between the two Al sheets during the ultrasonic spot welding process. The effects of the interlayer thickness on the microstructure and mechanical performances of the joints were systematically investigated. The results showed that, the optimum thickness of the Al 2219 particle interlayer was 10 m, which was beneficial to enhance the weld interface temperature up to 402 degrees C. The bonding interface of Al/Al 2219 with a wave-like shape was sound, and no significant diffusion layer occurred. The peak lap shear tensile strength (similar to 84.8 MPa) was obtained, which was 36% higher than that (similar to 67.3 MPa) for the joint without the Al 2219 particle interlayer. The strengthening mechanism is caused by the increase of plastic deformation and contact areas in the weld interface.

• 出版日期2019-2-1
• 单位天津大学