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EX300 Multi-Operator Multiprocess Welder EX300 Multi-Operator Welding Paks

Top Features

  • DC CC CV 1kW
  • 300 Amps Output at 32 Volts, 60% Duty Cycle
  • CC/CV DC Inverter Technology
  • Lightweight, Compact, Portable
  • Available in 4Pak or 6Pak Configurations
  • Processes: Stick (SMAW), TIG (GTAW), MIG (GMAW), Pulsed MIG, Multiprocess, Air Carbon Arc Cutting

Excellent performance for most welding processes including pulse MIG, TIG and Stick welding with optional Optima and Intellitig-4 controls. Available with either 208-230/460 V or 460/575 V input connections.

Product Details


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
Voltage Input: 230/1/60 and 208/230/460/3/60
Rated Input Current: Three-Phase, at 300 A, 32 VDC, 60% duty cycle: 30.5 amps at 230 V, 18.9 amps at 460 V, 15.2 amps at 575 V
Single-Phase, at 225 A, 29 VDC, 60% duty cycle: 47.4 amps at 230 V
Weight: 76 lb (34.5 kg)
Dimensions: H: 17" (432 mm) W: 12.5" (318 mm) L: 24" (610 mm)


Stick (SMAW)


  • MIG (GMAW) with voltage sensing and constant speed wirefeeders

  • Pulsed MIG
  • Pulsed MIG (GMAW-P) with optional controls

  • Multiprocess

    Air Carbon Arc Cutting

    Additional 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

    Options, Accessories and Related Equipment

    Remote control
    Water cooler
    Pulse MIG control
    Pulse TIG control
    115 VAC constant speed wirefeeders and spool guns
    4Pak and 8Pak multioperator systems

    Related Equipment
    RC1 remote control
    12 VS wirefeeder
    LN25 wirefeeder
    Coolmate water cooler
    Optima pulse MIG control
    Intellitig-4 pulse TIG control
    Ex300 Multi-Operator Paks
    All Multiprocess Welders

    Be sure to observe proper safety precautions and use the required protective equipment when welding.


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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.