Welding Guns

Magnum® PRO 400 Water Cooled - K4521-2

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Top Features

  • Rated at 100% Duty Cycle.
  • Industrial Grade Construction.
  • Premium Tip Performance
  • Expendables Built for High Heat
  • OverMolded Handle Design


MIG, Pulsed MIG, Flux-Cored

Wire Diameter Range

.035-5/64 (0.9-2.0)


Equipment Details

The Magnum PRO Water-Cooled Welding Guns are built to tackle high-heat applications while maintaining operator comfort.

  • 100% Duty Cycle – The 400A and 500A guns run at 100% duty cycle using 90/10 mixed gas, making them ideal for high heat applications
  • Premium Tip Performance – The large diameter and mass of the Magnum PRO Copper Plus contact tips help disperse heat and keep the tips cooler, expanding their life
  • Expendables Built for High Heat – The 500A water-cooled gooseneck design keeps the nozzle cool in high-heat applications
  • OverMolded Handle Design – The soft rubber over molding enhances comfort and allows for an easier grip of the gun
Duty Cycle at Rated Amperage 100%
Rated Amperage
  • 400
Gun Type
  • Handheld
Wire Diameter .035-5/64 (0.9-2.0)
  • Water cooled