Control on droplet size and metal transfer frequency based on pulsed laser in GMAW

To solve a series of problems existing in the projected droplet transfer of underwater welding such as narrow optional parameter, high input and residual stress, a laser-enhanced GMAW experiment platform including welding multi-information synchronization system was established and related experiment in atmospheric environment was conducted based on the underwater hyperbaric welding test tank in this paper. Result shows that droplet transfer gets rid of dominance of welding current and laser controls GMAW metal transfer actively with the assistance of laser when reasonable irradiation position and duty cycle of pulsed laser is selected. Result of experiment and related analysis laid a solid foundation on the further research of welding process stability control in underwater hyperbaric welding and ocean engineering.