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FX450 Multi-Operator Paks

Top Features

  • Multiprocess Capability
  • Variable Arc Control, Selectable Hot Start
  • Bright Digital Amp and Volt Meters - Easy to Monitor Even in Sunlight
  • Available in 4Pak and 6Pak Configurations
  • Processes: Stick (SMAW), TIG (GTAW), MIG (GMAW), Multiprocess, Air Carbon Arc Cutting, Flux-Cored (FCAW)

The FX450 is much lighter, smaller and takes up less floor space than a conventional multiprocess machine. The durable case has an IP23 enclosure rating which ensures it can withstand extreme field environments. This model is also Desert Duty Rated for extreme temperature operation up to 131° F (55° C).

Product Details


Input Voltage: 380/460/575/3/50/60
DC Amperage Range: 10 - 500 A
Maximum OCV: 60 VDC
Rated CC Output: 450 A at 38 VDC, 60% duty cycle
400 A at 36 VDC, 100% duty cycle
DC Voltage Range: 10 - 45 V
Weight: 125 lb (56.8 kg)
Dimensions: H: 18.8" (477 mm) W: 14" (356 mm) D: 26.5" (673 mm)
4Pak Specifications
Dimensions: H: 54.5" (1384 mm) W: 44.5" (800 mm) D: 32.0" (813 mm)
6Pak Specifications
Dimensions: H: 54.5" (1384 mm) W: 66.8" (1697 mm) D: 32.0" (813 mm)


Stick (SMAW)




Air Carbon Arc Cutting

Flux-Cored (FCAW)

Additional Features


  • Flexible Multi-Process Capability – Including stick, Touch Start TIG (DC), MIG, flux-cored welding and carbon arc gouging with up to a 3/8 in. (9.5 mm) carbon
  • Faster Arc Response means smoother arc action and more consistent bead appearance
  • Low Power Consumption results in daily operational cost savings
  • Enhanced Portability – Typically 50% less weight, size and footprint
  • Simple Operation – The user interface is designed with the operator in mind. Set up is easy for even the most novice welder
  • Bright Digital Amp and Volt Meters – Easy to monitor, even in sunlight, and presettable for precise procedure control
  • Compact, Durable Case – Tough IP23 enclosure rating ensures the Flextec™ 450 will withstand extreme field environments
  • Selectable Hot Start – Turn it off for thin material or flip it on to get the extra starting amperage you need for thick rusty or dirty material
  • Variable Arc Control – In stick mode, vary the arc force to obtain the “soft” or “crisp” arc you want as conditions require. In CV modes, vary the pinch or inductance to control spatter, fluidity and bead appearance
  • Full-Featured Remote Control Capability – Use a foot pedal or hand control to remotely vary output up to 100 ft. (30.5 m) away
  • Desert Duty Rated – Welding outputs are rated for extreme temperature operation up to 55°C

Options, Accessories and Related Equipment

Remote control
Shop-type undercarriage

Related Equipment
LN25 PRO-Extreme wirefeeder (115 volt wirefeeders are not supported)

FX450 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.