Abstract
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.
Highlights
Aluminum-lithium alloy has been widely used in the aviation, aerospace, automobile and ship industries because of its excellent mechanical performance, high specific strength and corrosion resistance
Solórzano et al joined the 2091 Al-Li alloy with tungsten inert gas (TIG) welding and investigated the effect of TIG welding on the mechanical behavior of 2090 Al-Li alloy [1]
The results showed that porosity redistribution by TIG dressing is due to fluid flow during the remelting of the weld pool and only weld pores less than 300 μm in size are redistributed or removed [5]
Summary
Aluminum-lithium alloy has been widely used in the aviation, aerospace, automobile and ship industries because of its excellent mechanical performance, high specific strength and corrosion resistance. The results showed that porosity redistribution by TIG dressing is due to fluid flow during the remelting of the weld pool and only weld pores less than 300 μm in size are redistributed or removed [5]. Zhu et al investigated the characteristics and formation mechanism of sidewall pores in narrow-gap gas metal arc welding of 5083 Al alloy. Some of the reports on ultrasonic degassing in the casting field have been found so far and the results suggest that the ultrasound could decrease the number of pores for the casting [10,11]. Ultrasonic degassing technology in TIG welding is introduced and the weld pore behavior of Al-Li alloy was investigated for the ultrasonic-assisted TIG welding method.
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