Abstract
AC GMA welding was carried out by using an inverter controlled welder which consists of a primary inverter to control the output level and a secondary inverter to control the polarity.The polarity of the base current in conventional synergic DC pulse welding was changed from electrode positive (EP) to electrode negative (EN), and one cycle one droplet transfer was achieved, in which a droplet transferred from the tip of the electrode wire to the molten pool synchronizing with the AC frequency.But a bigger droplet than that in the synergic DC pulse GMAW was formed in the synergic AC GMA welding. Arc stability and droplet transfer were much affected by the property of the electrode wire.
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