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EX425 Inverter Welder and Pak

Top Features

  • 350 Amps Output at 34 VDC, 60% Duty Cycle
  • Lightweight, Compact, Portable
  • Available in 4Pak and 6Pak Multioperator Configuration
  • Processes: MIG (GMAW), Stick (SMAW), TIG (GTAW)

350 amp at 60% duty cycle, constant current/constant voltage, DC inverter welder. Standard features include Auto-Line, Ammeter and Voltmeter, adjustable Arc Control, full Remote Control capability and Extreme-Duty construction.

Product Details


Rated Output: Single-Phase Input Power: 300 A at 32 VDC, 60% duty cycle
Three-Phase Input Power: 350 A at 34 VDC, 60% duty cycle
Voltage Range in CV Mode: 10 - 38 V
Amperage Range in CC Mode: 5 - 425 A
Max. Open-Circuit Voltage: 75 VDC
Weight: EX425: 80lb (36.3kg)
EX425 4Pak: 700lb (320kg)
EX425 8Pak: 1400lb (640kg)
Dimensions (H x W x D): EX425: 17" (432mm) x 12.5" (318mm) x 24" (610mm)
EX425 4Pak: 54.5" (1384mm) x 31.5" (800mm) x 32" (813mm)
EX425 8Pak: 54.5" (1384mm) x 63" (1600mm) x 32" (813mm)
Input Power:
EX425: 208-575/1/3/50/60
EX425 4Pak: 460/575/3/50/60
EX425 8Pak: 460/575/3/50/60
Product specifications and availability may vary by country



Stick (SMAW)


Additional Features

Wind tunnel technology protects electrical components and PC boards from contamination. Fan-On-Demand cooling system operates only when needed reducing noise, energy use and amount of contaminates pulled through the machine. Lift-Arc allows TIG starting without the use of high-frequency. Adaptive Hot Start increases the output amperage at the start of the weld if necessary, eliminating electrode sticking. Line voltage compensation keeps power constant even if power varies by +/- 10%. Process selector switch reduces the number of control setup combinations without reducing any features. Dual digital meters are included. 115 VAC auxiliary power.

Voltage Input
Individual Units: Auto-Line Power Management Technology allows for operation with any type of primary power from 208 to 575 VAC, single- or three-phase, 50 or 60 hertz, with no manual linking required - ideal for dirty or unreliable input power. 4Pak and 8Pak Multioperator units include DP120 Panels and operate with 460/575/3/60 input power.


  • CC/CV welding processes with full remote-control capability
  • Auto Remote Sense enables unit to automatically use remote control if connected to remote control receptacle
  • Potentiometer-type remote control
  • Exceptional electrical efficiency (87.24% efficiency at 400A)
  • Power factor of .95 enables smaller fuses/breakers and primary wiring
  • Selectable Low-OCV Stick mode reduces open circuit voltage to nearly 15 volts when welding power source is not in use
  • Extreme-Duty environmental protection with ultra-tough, poly carbonate-blended control panel cover
  • Tweco style output terminals
  • Wind Tunnel Technology protects electrical components and PC boards from contamination
  • Line Voltage Compensation keeps welding output constant with power variations of +/- 10%
  • CSA certified to both U.S. and Canadian Standards for welding equipment

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EX425 Inverter Welder and Pak

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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.