4.6 Article

Concurrent influence of ultrasonic vibration and controlled pulse current on plasma arc behaviors

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Summary: The ultrasonic vibration-assisted plasma arc welding technique can completely penetrate 8 mm thick stainless steel plates in a single pass with higher welding speed or lower peak welding current in controlled pulse keyhole mode. By continuously adjusting the welding current waveform in closed-loop strategy, successful achievement of one-pulse-one-open keyhole mode with lower welding heat input was possible. Due to the reduction of heat input and further constriction of plasma arc under the action of ultrasonic vibration, the weld was narrowed and the depth-width ratio was raised.

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