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Metals 2017, 7(2), 53;

Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Author to whom correspondence should be addressed.
Received: 7 January 2017 / Accepted: 8 February 2017 / Published: 10 February 2017
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Ultrasonic‐assisted tungsten inert gas welding was carried out on a thin plate of 2195 Al‐Li alloy, and the characteristics of the weld pores were analyzed in terms of their size and porosity. The effects of welding speed and ultrasonic power on the porosity and size of the pores were investigated. The pores were found to occur primarily adjacent to the surface of the weld. The porosity decreased and the size increased with a decrease in welding speed. The effect of ultrasonic power on the characteristics of the pores was different from that of the welding speed. The porosity and size of the pores decreased and then increased with an increase in ultrasonic power. A relationship was found between the transient cavitation intensity and the characteristics of pores. An increasing transient cavitation intensity results in a decrease in the porosity and size of pores when the transient cavitation intensity is lower. However, it can result in an increase in the porosity and pore size when the transient cavitation intensity further increases. Finally, the influencing mechanism of cavitation on welding pores was discussed. View Full-Text
Keywords: aluminum alloy; ultrasonic power; TIG welding; pore; weld pool aluminum alloy; ultrasonic power; TIG welding; pore; weld pool

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Chen, Q.; Ge, H.; Yang, C.; Lin, S.; Fan, C. Study on Pores in Ultrasonic‐Assisted TIG Weld of Aluminum Alloy. Metals 2017, 7, 53.

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