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Miller XMT 350 MPa

Miller XMT 350 MPa

Top Features

  • DC CC CV
  • Profile Pulse - TIG Appearance with MIG Simplicity
  • Auto-Line Input Power Management
  • Processes: Stick (SMAW), TIG (GTAW), MIG (GMAW), Pulsed MIG, Air Carbon Arc Cutting, Flux-Cored (FCAW)

The XMT 350 MPa is portable and versatile for applications from jobsites to the factory floor. Built-in pulse programs for manufacturing and fabrication applications that have benefits for standard steels, high-strength steels and aluminum.

Product Details


Product Number: 907366
Voltage Range in CV Mode: 10 - 38 V
Amperage Range in CC Mode: 5 - 425 A
Rated Output: 3 Ph: 350 A at 34 VDC, 60% duty cycle
1 Ph: 300 A at 32 VDC, 60% duty cycle
Amps Input at Rated Output, 60 Hz:
  208V 230V 400V 460V 575V kVA kW
3 Ph   40.4   36.1   20.6   17.8   14.1   14.2   13.6  
1 Ph   60.8   54.6   29.7   24.5   19.9   11.7   11.2  
Max. Open-Circuit Voltage: 75 VDC
Dimensions: H: 17" (432 mm) x W: 12.5" (318 mm) x D: 24" (610 mm)
Net Weight: 80 lb (36.3 kg)


Stick (SMAW)



Pulsed MIG

Air Carbon Arc Cutting
Rated: 1/4-inch carbons
Capable: 5/16-inch carbons
Flux-Cored (FCAW)

Additional Features

XMT 350 MPa expands the process capability of the XMT Series, with built-in Pulsed MIG operation. MPa stands for MIG, Pulse, advanced arc control. The advanced arc control provides:

  • Improved pulsed MIG welding
  • More control over the puddle and weld bead using SharpArc
  • More robust and stable arc at very low arc lengths
  • Reduces heat input
  • Welds on a wider range of material thicknesses

Sharp Arc on the XMT 350 MPa:

  • Can handle virtually any welding job, including those hard-to-weld alloys found at power generation plants and shipbuilding facilities
  • A low setting gives a more fluid puddle and a flatter bead appearance
  • A high setting gives a less fluid puddle and a ropier bead appearance
  • Can be adjusted to help customize the arc for the type of shielding gas being used

Additional features

  • Auto-Line Power Management technology allows for any input voltage hook-up (208-575V) with no manual linking, providing convenience in any job setting. Ideal solution for dirty or unreliable input power
  • 350 amps of welding output at 60% duty cycle enables improved deposition through using larger diameter electrodes common in construction applications
  • Available with Dinse or Tweco-style output connectors
  • Power factor of .95 enables smaller fuses/breakers and primary wiring. Primary amperage draw at rated output is 25% less than the competition
  • Exceptional electrical efficiency. At 400 amps, efficiency is 87.24%, this helps to reduce the utility bill or fuel supply required to weld
  • Inverter arc control technology provides greater puddle control for superior 6010 Stick electrode performance
  • Auto Remote Sense enables unit to automatically use remote control if connected to remote control receptacle
  • Reduced OCV operation - an internal dip switch enables reduced open-circuit voltage Stick welding capability. OCV is typically below 15 volts
  • Process selector switch reduces the number of control setup combinations without reducing any features
  • Large, dual digital meters are easy to view and presettable to ease setting weld output
  • Lightweight, aerospace-grade aluminum case offers protection with the benefit of reduced weight
  • Wind Tunnel Technology™ Internal air flow that protects electrical components and PC boards from dirt, dust, debris... greatly improving reliability
  • LVC Line Voltage Compensation Keeps output of the power source constant regardless of fluctuation in input power ± 10%
  • Fan-On-Demand Internal power source cooling system that only works when needed, keeping internal components cleaner
  • Adaptive Hot Start for Stick Automatically increases output amperage at the start of a weld should the start require it and prevents the electrode from sticking and creating an inclusion
  • Lift-Arc Simply touch the tungsten to the work piece and the arc is initiated instantly and automatically without the use of high frequency
  • Optional 115 VAC auxiliary power provides 10 amps of circuit-breaker-protected power for water circulators, etc

Options, Accessories and Related Equipment

Related Equipment
Miller 74 MPa Plus Wire Feeder

Miller XMT 350 MPa

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Airgas, an Air Liquide company, is the nation's leading single-source supplier of gases, welding and safety products. Known locally nationwide, our distribution network serves more than one million customers of all sizes with a broad offering of top-quality products and unmatched expertise.