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Pulsed ultrasonic wave is employed to interfere the GMAW process, and the new method is named as pulsed ultrasonic wave-assisted GMAW (PU-GMAW). A controllable periodic ultrasonic resonant field has been established in the arc space, and the periodic ultrasonic radiation force was used to improve the arc energy density and to promote the droplet transfer. It was found that compared with GMAW, under...
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