Study on piezoelectric actuator based GMAW welding decoupling control method and its mechanism

The piezoelectric actuator based welding stick return mechanism combined with DSP coring control system was adopted to research the effect of extra force on droplet transfer. With high-speed shooting on welding process, the effects of different parameters on droplet transfer were studied. The results indicated that extra separating force was applied to droplet by using of piezoelectric actuator based welding stick return mechanism, and the droplet transfer was realized. The longer the return time, the greater the welding current, the bigger the wire feeding speed, and the easier the realization of droplet transfer. There was almost no spatter during the welding process; droplet transfer was realized with non-short circuiting transfer at low current.