First single- or three-phase power Millermatic that's optimized to weld aluminum. Perfect for fabrication, manufacturing, maintenance and repair.


Superior aluminum performance. Direct connection for Miller 10-pin XR-Aluma-Pro™ and XR™ Pistol Grip air-cooled push-pull guns. With Auto Gun Detect, simply pull the trigger for the gun to be used and you’re ready to weld.

Note: Not compatible with standard MIG guns.


NEW! True torque feed motor push-pull design provides continuous push force to the wire while the gun motor controls the speed at the gun. The motors work together to provide accurate and positive wire feed speed without wire shaving or deformation.


Synergic pulsed welding mode offers the simplicity of single-knob control. The machine will select the correct pulse power based on the wire feed speed (WFS) set by the operator.


NEW! Synergic MIG provides communication between power source, feeder and gun. As wire speed increases/decreases, the arc voltage also increases/decreases to maintain a constant welding arc.


NEW! Trigger schedule select (SCHD) allows the operator to select the alternative schedule by quickly tapping the gun trigger when not welding. Useful when switching between two welding parameters is needed.


NEW! Trigger hold allows the operator to release the trigger while making long continuous welds, reducing hand and finger fatigue.


NEW! Jog and purge allow operator to jog the wire, or purge gas lines and preset gas pressure at the regulator before welding.


Fan-On-Demand™ cooling only operates when needed, reducing power consumption and contaminants inside the unit.


Special features

• Run-in adjustment for better starts

• Built-in two-minute spot timer

• Pre-flow and post-flow adjustment

• View actual welding amperage/voltage during welding, and five seconds after arc has shutoff

• SharpArc™ controls welding arc cone width in pulsed MIG welding mode

• Inductance control customizes weld output characteristics in MIG welding mode



  • Power source
  • 25-ft. (7.6 m), 300 A gun for .030–.047 in. (0.8–1.2 mm) aluminum (#300 001)
  • 10-ft. (3 m) industrial power cord (without plug)
  • 10-ft. (3 m) work cable with clamp
  • Factory-installed gas solenoid
  • Smith® Argon mix regulator/flow gauge with hose
  • Factory-installed, low-mounted running gear/cylinder rack
  • .035 and .047-in. (0.9 and 1.2 mm) U-groove aluminum drive rolls



    Industries Interests Racing / Customizing / Restoring
    Farm and Ranch
    Boat / Yacht
    DIY / Home Hobbyist
    Weldable Metals Aluminum
    Input Voltage 208 V 
    220/230/240 V 
    460/480 V 
    Input Phase 1- and 3-Phase
    Input Hz 60 Hz
    Input Amperage 15 A
    Current Type DC
    Rated Output 300 Amps at 32 VDC, 60% duty cycle, 60Hz, 1- or 3-Phase 
    Max Open Circuit Voltage 72 VDC
    Amperage Range 25 A - 400 A
    Wire Feed Speed 1.3 m/min - 20 m/min
    50 IPM - 20 m/min
    1.3 m/min - 800 IPM
    50 IPM - 800 IPM
    Wire Diameter Aluminum 0.035 in 0.047 in
    Aluminum 0.9 mm 1.2 mm
    Spool Size 12 in (305 mm)
    Net Width 19 in
    Net Height 34 in
    Net Length 41 in
    Net Weight 181 lbs
    Warranty 3 Years 
    Miller's True Blue Warranty
    Portability Running Gear / Cart (Standard)
    Weld Output CV



    Millermatic® 350P MIG Welder Aluminum Push-Pull Gun 25ft XR-Alumna-Pro 1/3 Phase

    SKU: 951452




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      Phone: 305-888-6292


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