Based on the high-speed photography, the effect of phase relations on droplet transfer and welding seam was analyzed. To each TCGMAW (Twin-wire Co-pool Gas-shielded Metal Arc Welding) torch at four-wire welding robot, under the descriptive welding parameters, when the phase relation of the front wire and the back wire was alternate, the arcs of the two wires had no effect on each other basically; the welding seam shaped very well. When the phase relation was synchronized, the arcs attracted each other and the two arcs centralized to the middle of the two wires; the humping bead was formed. When the phase relation was random, now and then the arcs synchronized and attracted each other, and at times the arcs changed alternately and had no effect on each other; the appearance quality of the welding seam was moderate.
In order to enhance ships' security and stable energy efficiency,there are new challenges about the means on power quality assessment improvement of marine electric system. This paper analyzed the importance to the ship’s safety for quality of electricity,and discussed present situations about the question of poor power quality in marine electric system; moreover,especially proposed reasonable means on power quality assessment and more effective and practical means on improvement of marine electric system,through massive studies the experiment repeatedly using the mature control theory and computer simulation technology,as well as instance of three-phase harmonic filter for controlling harmonic distortion,based on the Matlab simulation software to establish the 12 pulse (AC - DC) converter simulation model; finally emphasized the future research directions and prospects of the electric utilization and marine engineering technology development.These important means may promote energy conservation and reliability enhancement to more deeply research on power quality assessment improvement of marine electric system.
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