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D300K 3+3

D300K 3+3 Diesel Engine WelderD300K 3+3 Mobile Welding Trailer

Top Features

  • DC CC 3kW
  • Five Output Taps and Fine Current Control
  • Built to Red-D-Arc Extreme-Duty Specifications
  • Fuel Efficient V2003BG Kubota Diesel Engine
  • 3,000 Watts AC Auxiliary Power
  • Processes: Stick (SMAW), Air Carbon Arc Cutting, Plasma Arc Cutting, Flux-Cored (FCAW)

The pure DC generator with all copper coils provides excellent welding characteristics. The welder’s choice for pipeline welding and general construction work. Constant speed engine for instant arc starting. The V2003BG Kubota diesel engine provides reliable, efficient operation in even the most severe conditions.

Product Details


DC Amperage Range: 40 - 350 A
Maximum OCV: 98
Rated Output: 300 A at 32 VDC 60% duty cycle
250 A at 30 VDC 100% duty cycle
Auxiliary Power: 3,000 watts, 60 Hz, 15 amps with circuit breaker and GFCI receptacle
Fuel Capacity: 15 gallons (57 L)
Fuel Consumption: 0.44 GPH (1.66 LPH)
Weight: 1,434 lb (650.5 kg)
Dimensions: H: 41" (1041 mm) W: 24" (610 mm)
L: 70.25" (1784 mm)


Stick (SMAW)
Air Carbon Arc Cutting
Plasma Arc Cutting
Flux-Cored (FCAW)

Additional Features

The D300K 3+3 is a 300 amp @ 50% duty cycle, constant current, DC, diesel engine-driven welder with 3,000 watts 120 VAC auxiliary power. Its copper-wound generator provides excellent welding characteristics. Output adjustment is via a 5-position current range selector and a fine-current adjustment control. A remote control receptable for operation with rheostat-type remote controls is standard. A CC/CV model is available which delivers 250 amps @ 100% duty cycle for MIG and flux-cored welding.

Kubota V1903-EBG, liquid-cooled, four cylinder, 26 HP @ 1800 rpm, 113 cu. in. industrial diesel engine is designed for 10,000 hours operation before first basic overhaul. Engine runs at a constant 1800 RPM for longer serviceintervals, long engine-life and low operating-costs. Engine preheat provides excellent cold weather starting (with no ether required). Automatic engine shutdown protection for low oil-pressure is standard.


  • Extreme-DutyTM protective frame
  • Fuel efficient Kubota diesel engine
  • Low engine noise level
  • Engine hourmeter
  • Battery ammeter
  • Engine coolant temperature gauge
  • Standard remote control receptacle
  • 120 VAC, 20 A GFCI duplex receptacle
  • 20 A auxiliary-power circuit breaker
  • Double rubber-sealed armature bearing
  • Self-bleeding fuel system
  • Heavy-duty battery
  • CSA approved

Options, Accessories and Related Equipment

CC/CV model with Wire Feed Module
Construction trailer
240 VAC auxiliary-power receptacle

Related Equipment
LN25 wirefeeder with CV Wirefeed Module option
RC4 remote control

Used Diesel Welders

D300K 3+3

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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.