Improvements in the Microstructure and Mechanical Properties of Aluminium Alloys Using Ultrasonic-Assisted Laser Welding

Welding high-strength aluminium alloys is generally a delicate operation due to the degradation of mechanical properties in thermally affected zone (TAZ) and presence porosities molten metal. Furthermore, contain compounds that solidify before rest base alloy, therefore acting as stress concentration points lead phenomenon hot cracking. This paper investigates process applying ultrasonic vibrations pool alloy AA6082 improve both its microstructure properties. We analysed conventional ultrasonic-assisted laser welding processes assess sonication effect band 20–40 kHz. Destructive nondestructive tests were used compare ultrasonically processed samples baseline samples. achieved 26% increase tensile weld yield strengths welds plates via power irradiation under optimum variable values during welding. It estimated ultrasound intensity melt, using maximum 160 W from pair 28 kHz transducers, was 35.5 W/cm2 spatial average 142 at antinodes. Cavitation activity significant sometimes main contributor improvements quality.