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EX300 Multi-Operator Paks

EX300 Multi-Operator Multiprocess Welder PakEX300 Multi-Operator Welding Paks

Top Features

  • Compact, Highly Portable Inverter Design
  • Arc Force Control, Adaptive Hot Start
  • Digital Meters for Preset Welding Output
  • Lift-Arc for TIG Starts, Process Selector Switch
  • Available in 4Pak and 8Pak Configurations
  • Processes: Stick (SMAW), TIG (GTAW), Pulsed TIG, MIG (GMAW), Pulsed MIG, Multiprocess, Multioperator

Available in 4Pak, 6Pak and 8Pak configurations, these multioperator welders are easily maneuvered around most jobsites when mounted on the optional wheel kit. Excellent stick welding performance with up to 400 DC amps per arc combined with the features of a high-end MIG machine make this a very versatile system.

Product Details


Individual Module Specifications
DC Amperage Range: 5 - 400 A
Maximum OCV: 90 VDC
Rated CC Output: 300 A at 32 VDC, 60% duty cycle, 3 Phase
DC Voltage Range: 10 - 35 V
4Pak Specifications
Weight: 700 lb (320 kg)
Dimensions: H: 54.5" (1384 mm) W: 31.5" (800 mm) D: 32" (813 mm)
6Pak Specifications
Weight: 1050 lb (480 kg)
Dimensions: H: 76.5" (1943 mm) W: 31.5" (800 mm) D: 32" (813 mm)


Stick (SMAW)


Pulsed TIG
  • Pulsed TIG (GTAW-P) with optional controls

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

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

  • Multiprocess


    Additional Features

    Excellent performance for most welding processes including pulse MIG and TIG with optional Optima and Intellitig-4 controls. Available with either 208-230/460 V or 460/575 V input connections. The 4Pak requires a 60 amp service and the 6Pak a 100 amp service with either 460 or 575 volt, 3 phase power.


    • 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
    • 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
    Wheel kit

    Related Equipment
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    All Multi-Operator Paks

    EX300 Multi-Operator Paks

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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.