Influence of Welding Materials of Duplex Current Feeding MIG Welding

Abstract

The duplex current feeding metal inert gas (DCF-MIG) welding which has two current feeding points was developed. This DCF-MIG process is able to control the welding current and wire feeding speed independently by additional feeding current from the secondary tip below the conventional MIG tip. In the past DCF-MIG studies, only the studies using the steel or SUS welding wire material were reported. In this study, the influence of welding wire materials of DCF-MIG was investigated. As a result, the electrical conductivity of welding wire materials was found to have influence on the quantity of Joule heating between current feeding points. However, in the DCF-MIG with low electrical conductivity material, the average of primary current greatly decreases as the increase of the secondary current, consequently the total current of DCF-MIG was suppressed. It was found that there was the optimum value of electrical conductivity of welding material to obtain enough effects of DCF-MIG.