Effects of Ultrasonic Vibration on the Welding Process of Friction Stir Welding

Abstract:

Based on the understanding of Friction Stir Welding (FSW) and the effect of ultrasound, the purpose of the paper is trying to find the effective access to reduce the welding resistance and improve the quality of weld during FSW. The best vibration point was first determined through the vibration test system. Then, the thermal cycling, three-force and torque were tested by using paperless recorder and mechanical sensor in heat-power test bench for 4mm thick AZ31 magnesium alloy. The results showed that the periodic vibration took place at the weld under the excitation of ultrasonic vibration, and the frequency of this vibration was as same as the frequency of ultrasonic vibration. The best tracking distance of ultrasonic vibration was 40 mm, and its optimal incident angle was 45°. By applying ultrasonic vibration to FSW, the forward resistance, the axial force and the torque of the tool can be significantly reduced. In addition, the distribution of temperature field was basically consistent with the two conditions, presenting “asymmetrical, non-linear” distribution characteristic. The heating effect of ultrasonic vibration was not obvious, but it was able to make the temperature field of the welding seam become more uniform.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 710-715
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.710
• Online since: March 2016
• Authors: Ye Liu, Sheng Lu*
• Keywords: FSW, Thermal Cycling, Three-Axis Force, Three-Dimensional Asymmetric, Torque, Ultrasonic Vibration

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