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The ultrasonic characteristics of high frequency modulated arc and its application in material processing
Authors:Longbiao He  Ping Yang  Luming Li  Minsheng Wu
Institution:1. National Institute of Metrology, Beijing 100013, China;2. Tsinghua University, Beijing 100084, China
Abstract:To solve the difficulty of introducing traditional ultrasonic transducers to welding molten pool, high frequency current is used to modulate plasma arc and ultrasonic wave is excited successfully. The characteristics of the excited ultrasonic field are studied. The results show that the amplitude-frequency response of the ultrasonic emission is flat. The modulating current is the main factor influencing the ultrasonic power and the sound pressure depends on the variation of arc plasma stream force. Experimental study of the welding structure indicates grain refinement by the ultrasonic emission of the modulated arc and the test results showed there should be an energy region for the arc ultrasonic to get best welding joints.
Keywords:High frequency  Modulated arc  Ultrasonic  Welding structure refinement
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