Abstract
In order to perform stable pure argon MIG welding, duplex current feeding MIG welding has been developed. In the previous experimental study, higher droplet temperature and deeper weld penetration were obtained in the duplex current feeding MIG welding compared with those of the conventional MIG welding. However, the similar effects are considered to be realized also by the conventional MIG welding with short wire extension through increase in welding current. In this paper, basic characteristics of the duplex current feeding MIG welding were compared with those of the conventional MIG welding with the short wire extension. Consequently, it was found that the duplex current feeding MIG welding achieved the deeper weld penetration without an undercut unlike in the case of the conventional MIG welding with the short wire extension.
