Abstract
Triple-wire gas indirect arc (TW-GIA) welding is a new type of welding method. In the TW-GIA welding process, the workpiece is not connected to the power source, and the arc is built between the three wires. In this essay, the arc stability and bead forming of the high-speed TW-GIA welding are studied under a new wire arrangement. Results show that with the increasing of the welding currents, the range of voltage and current fluctuations are reduced during the welding process, and the arc stability is improved. The reason is that increasing current can stabilize the droplet transfer. Since the arc is built between the welding wires, the influence of welding speed on the arc stability of TW-GIA welding is limited. Compared with traditional gas metal arc welding, TW-GIA welding has the characteristics of high deposition rate and low dilution rate, which is helpful for increasing welding speed. The welding speed of 2 mm-thickness steel plate can reach 2.8 m/min by using TW-GIA welding.
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