Big Blue® 800 Duo Pro Air Pak Engine-Driven Welder - MillerWelds

Big Blue 800 Duo Air Pak (Deutz)

Our most powerful Air Pak offers dual-operator productivity and Multiprocess flexibility. The clean running EPA T4i & T4F compliant engines reduce emissions.
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What's Included

  • 120 V Block Heater
  • Lockout/Tagout Battery Disconnect Switch
  • Vandalism Lockout Kit
Multi-arc Welding
One dependable engine—two independent arcs with up to 400 amps each. Or plug in additional inverters for a true multioperator work platform! Example: Two additional XMTs equals four operators, up to 200 amps each. Premium-quality arcs allow operators to work independently with no arc interaction. Multioperator welding has never been easier or more versatile.
More Power & Increased Efficiency
33 percent increase in rated output equals 800 amps of weld power and 27,000 watts of generator power. More arcs and better fuel economy equal increased profits for your business. Estimated savings are 34 percent with dual-operator unit versus two single-operator units.
Electronic Engine Display
Simultaneously displays fuel level, engine hours, coolant temperature, oil pressure, battery volts, and engine RPM. Also tracks oil change intervals and displays engine diagnostics for quick and easy servicing.
Heavy-Duty Low-Speed Deutz TD2.9 L4 T4F Industrial Diesel Engine
The cleanest, greenest diesel power available. Utilizes Diesel Oxidation Catalyst (DOC) technology to keep the air clean with NO exhaust aftertreatment maintenance.
Air Compressor - Ingersoll Rand
Ultra-reliable industrial rotary screw air compressor. 30,000-hour life expectancy. Independent on/off control for applications not requiring compressed air — allows greater fuel savings and longer compressor service intervals.
The Vault
The vault allows for the ultimate control board reliability in CC/CV models. Hardened solid-state control technology, housed in a sealed vault. The vault's sealed connections are made through watertight plugs that make these components impenetrable to dust and moisture.
Low OCV Stick (VRD)
Reduces the open-circuit voltage to 15 volts when the welding power source is not in use, increasing operator safety without compromising arc starts. Remote Oil Drain Prevents spills and makes servicing engine and compressor oil easy.
Infinite Arc Control
Allows the arc characteristics to be changed for specific applications in Stick, MIG and FCAW Thermal Overload Protection Prevents machine damage if the duty cycle is exceeded or airflow is blocked. Auto Remote Sense™ (ARS) Detects if a remote control is plugged into a 14-pin receptacle and eliminates confusion of a remote/panel switch.
Other Standard Features
Digital preset weld meters, automatic idle, vandalism lockout kit (protects control panel and receptacles), and lockout/tagout battery disconnect switch.



Air Carbon Arc Cutting and Gouging (CAC-A)
Compressed Air
Flux Cored (FCAW)
Stick (SMAW)
Submerged Arc (SAW)

General Specifications

Industries Interests Construction
Maintenance and Repair - Field Operations
Work / Service Trucks
Carbon Diameter 1/2 in (12.7 mm)
Cold Weather Starting Aids Engine Block Heater
Glow Plugs
Current Type DC
Engine Brand Deutz
Engine Compliance T4F
Engine Idle Speed 1350 RPM
Portability Lift Eye (Standard)
Trailer (Optional)
Fork Pockets
Engine Weld Speed 1800 RPM
Fuel Tank Size 25 Gallon
Net Height 46 in
Fuel Type Diesel
Net Length 69.5 in
Horsepower 65.7 hp
Max Open Circuit Voltage 85 VDC
Net Weight 2095 lbs
Weldable Metals Stainless Steel
Mild Steel
Net Width 28.5 in
Rated Output Separate (Dual Outputs) 400 A at 36 VDC, 100% duty cycle
Single Phase Generator Continuous Power 12000 W
Warranty Engine Warranties
Miller's True Blue Warranty
Single Phase Generator Peak Power 15000 W
Sound Rating Idle: 71.3 dB / Weld: 78.9 dB
Three Phase Generator Continuous Power 20000 W
Three Phase Generator Peak Power 27000 W
Amperage Range 20 - 800