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D502K 5+20 Diesel Engine Welder

D502K 5+20 diesel welder

Top Features

  • Portable DC CC CV Welding
  • Built to Red-D-Arc Extreme-Duty Specifications
  • Kubota V3300-B 49 HP Liquid-Cooled Diesel Engine
  • 20,000 Watts of 3-Phase 240 VAC Auxiliary Power
  • Processes: Stick (SMAW), TIG (GTAW), MIG (GMAW), Air Carbon Arc Cutting, Flux-Cored (FCAW)

The three phase rotating field generator produces a constant DC weld output and has enough power for gouging carbons of up to 3/8" . Easy to use control panel with a 5 position range switch and a fine control potentiometer expedites process set-up and switching.

Product Details


DC Amperage Range: 20 - 600 A
Maximum OCV: 95
Rated CC Output: 500 A at 40 VDC 100% duty cycle
600 A at 44 VDC, 40% duty cycle
DC Voltage Range: 14 - 40 V
Auxiliary Power:
5,500 watts Peak, 4,000 watts Continuous, 33.3/16.6 A, 120/240 VAC
Auxiliary Power:
(not welding)
Single-Phase: 12,000 watts, 50 A, 120/240 VAC, 60 Hz or
Three-Phase: 20,000 watts, 48 A, 240 VAC, 60 Hz
Fuel Capacity: 25 gallons (95 L)
Weight: 1,808 lb (820 kg)
Dimensions: H: 50" (1270 mm) W: 30.75" (781 mm) L: 69.5" (1765 mm)


Stick (SMAW)



Air Carbon Arc Cutting

Flux-Cored (FCAW)

Additional Features

The D502K 5+20 is a 500 amp @ 100% duty cycle, constant current, constant voltage, DC, diesel engine-driven welding machine with an available 20,000 watts 240 VAC auxiliary power. Its three-phase rotating field generator produces a smooth DC weld output and has enough power for gouging with up to 3/8" carbons. A simplified control panel provides easy process set-up and includes a five-position Amperage Control switch, a potentiometer-type Voltage/Amperage Adjust Control for fine-control, and a six-position Process/Contactor Control switch. Remote contactor control, as well as remote amperage and voltage control, are via a 14-pin receptacle mounted on the front control panel.


  • 25 gallon (95 litre) fuel tank
  • Body constructed of 304 brushed stainless steel sheet metal for enhanced durability
  • 15-stage process epoxy-electrocoated fully-enclosed base (e-coat)
  • Rugged, simple control panel
  • Remote oil drain and easy-access fuel drain
  • Low oil pressure and temperature safety shutdown
  • Standard front-panel mounted Engine hour meter, Fuel gauge, Battery ammeter and Engine temperature gauge
  • 120 V 20 A GFCI receptacle, 240 V 20 A twistlock receptacle, 120/240 V 50 A receptacle, 240 V 48 A 3-phase connection

Options, Accessories and Related Equipment

Remote control
Current/voltage control
Polarity reversing/AC switch for AC-TIG welding
20,000 watts auxiliary
Extreme-Duty protective frame
Construction trailer

Related Equipment
129 340 RHC-14 remote control
043 955 LDR-14
195 095

D502K 5+20 Diesel Engine Welder

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Airgas, an Air Liquide company, is a leading U.S. supplier of industrial, medical and specialty gases, as well as hardgoods and related products; one of the largest U.S. suppliers of safety products; and a leading supplier of ammonia products and process chemicals.