creased. The typical solidification structure consisted of equiaxed grains in the center of welds and the grains were significantly refined by the pulsed ultrasonic treatment. 3. Welding with a more constrained arc and stronger acoustic field could reduce the number density of coarse second-phase particles (S-phase) and produce a higher energy density distribution of electron beam acting on aluminum alloys, but would not result in stronger gasification burning of the Zn element than with the conventional arc. It is generally thought that the ultrasonic streaming plays a pronounced effect on the redistribution of strengthening elements. 4. The joint properties of PU-GMAW were better than that of the other two welding processes, and tensile properties ranking was PU-GMAW > U-GMAW > GMAW, which was attributed to the deeper and larger dimples. The average microhardness of the fusion zones corresponded to GMAW, U-GMAW, and PU-GMAW were about 65, 70, and 80% of the BM, respectively. 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