Abstract
This paper investigated the effect of pulsed power ultrasonic on the appearance, microstructure and mechanical properties of aluminum alloy using self-developed pulsed power ultrasonic wave assisted gas metal arc welding (PU-GMAW) device. The feature of the method was to combine arc and pulsed power ultrasonic field coaxially. The results indicated that, compared with conventional GMAW, the weld penetration of PU-GMAW was much increased and the melting area increased by around 49%. Further, weld melting area enlarged as pulse frequency increased. The average hardness of the weld metal of PU-GMAW was about 15 HV higher than that of GMAW. At the end, the mechanism of melting area enlargement and weld penetration enhancement was discussed, which was attributed to the increase of the welding heat input.
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