Pulsed MIG system optimizes aluminum welding Miller Electric's Millermatic 350P all-in-one MIG/Pulse MIG welder, combined with the 25-ft. air-cooled XR-Aluma-Pro gun, provides superior 4000- and 5000-series aluminum feeding and welding performance. The 350P also has wire-specific programs that maintain the optimal peak, background and pulse width parameters to extend tip life and increase the time between tip replacement. The system comes with reversible .035"-3/64" u-groove drive rolls and a Teflon intermediate guide.