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12VS Extreme-Duty with EX300

12VS Extreme-Duty with EX30012VS Extreme-Duty with EX300

Top Features

  • Designed for High-Amperage Applications
  • 12VS Operates on Arc Voltage
  • Excellent Performance for Most Welding Processes
  • Processes: MIG (GMAW), Wirefeeders, Flux-Cored (FCAW)

Improved contactor and overall duty cycle for high-amperage applications (425 A at 60%). Trigger hold, wire jog, and gas purge are all located on the front panel. Excellent performance for most welding processes including pulse MIG and TIG with optional Optima and Intellitig-4 controls.

Product Details


12VS Extreme-Duty Wirefeeder
Wire feed speed: 50 - 780 IPM (1.3 - 19.8 m/min)
Welding Circuit Rating: 425 A at 60% Duty Cycle
Input Power: OCV and arc voltage 14 to 48 VDC
Max OCV: 110 VDC
Wire Diameters: .023 - 5/64" solid, .030 - 5/64" flux-cored
Maximum Spool Size: 45 lb (20.4 kg), 12" (305 mm)
Weight: 35 lb (15.9 kg)
Dimensions: H: 21" (533 mm) W: 9" (229 mm) D: 15.5" (394 mm)
EX300 Power Source
DC Amperage Range: 5 - 400 A
Maximum OCV: 90 VDC
Rated CC Output: 300 A at 32 VDC, 60% duty cycle, 3 Phase
225 A at 29 VDC, 60% duty cycle, 1 Phase
DC Voltage Range: 10 - 35 V
Shielding gas, welding wire and other consumables sold separately




Flux-Cored (FCAW)

Additional Features

EX300 Features

  • 400 amps maximum output, 300 amps at 60% duty cycle
  • Multiprocess power source combines the advantages of inverter-based design with the built-in features of a high end MIG machine
  • At only 76 lb (34.5 kg) the EX300 offers the portability that allows you to take it anywhere it's needed
  • Operates off of single or three phase power
  • Extreme Duty™ construction protects internal components and ensures reliable operation, even in the most abusive working conditions
  • NEMA Class 1 Rating
  • Wind tunnel technology protects electrical components from contamination, significantly improving reliability
  • Dual digital volt and amp meters for presetting weld output
  • Protective cover for control panel
  • Fan-on-demand operates the cooling system when needed for improved efficiency
  • Dig/arc force control gives variable additional amperage during low voltage (short arc length) conditions
  • Adaptive hot start eliminates electrode sticking at arc start
  • Lift-arc for TIG starting without the use of high frequency
  • Auto-Link circuitry sets the power source to the primary voltage being applied
  • International style weld cable connections for quick and easy disconnects
  • Process selector switch for quick and easy process changing
  • Line voltage compensation for constant output regardless of input power fluctuations
  • 3 year warranty

All Product Resources

Options, Accessories and Related Equipment

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12VS Extreme-Duty with EX300

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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.