Arc Behavior and Droplet Transfer Process of VP CMT

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Abstract
Cold metal transfer (CMT) is widely used in thin sheets welding, owing to its low heat input and freedom of spatter. An evolutionary technology, called CMT Adv, combines CMT and variable polarity (VP) process. Arc behavior analysis and droplet transfer analysis were performed by image capture system synchronized with current and voltage sensor. Checker calibration method was used to get dimensions of droplets. The results show that motion of filler wire, current and voltage waveform and droplet transfer of VP CMT (CMT Adv) are coordinated to maintain welding stability. And through precise energy control, droplets of same dimensions can be got in EP and EN period, which are similar to diameter of filler wire. To from droplets with same dimensions, lower power was supplied and melt efficiency is higher in EN period.

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