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

Big Blue® 800 Duo Air Pak™ Truck Mount Spec w/Wireless Interface Control

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

Truck Mount Spec, Wireless Interface Control

Wireless Interface Control

Base Model

Truck Mount Spec

Get Total Control — Where You Work: Wireless Interface Control


What's Included

  • 2 Wireless Interface Control remotes
Heavy-Duty Low-Speed T4F and T4i Industrial Diesel Engines
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.
Wireless Interface Control
Get full control of your machine in the palm of your hand, from wherever you are on the jobsite, so you can work hassle free. With wireless interface control, you can: 
  • Change welding processes
  • Adjust parameters
  • Select and save preset programs
  • Turn the machine on/off
  • View service reminders 
  • And more! 
Extend time between fill ups and maintenance intervals while eliminating the need to go back to your machine to make adjustments.
  Learn More
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.
Truck Mount Spec
Critical controls are located within easy reach for a ground-based operator when the machine is mounted on the bed of a large-body truck.
ArcReach® Technology
ArcReach technology uses existing weld cables to communicate process adjustment commands back to the engine-driven welder. With an ArcReach system, amperage & voltage are conveniently located at the operator's fingertips - not back at the power source.   Learn More
Dynamic DIG™
Unlike conventional DIG that provides a preset amount of short-clearing current, Miller’s proprietary Dynamic DIG works on a time-based algorithm that automatically adjusts the amount of current required to clear a short. What does this mean? A smoother more consistent arc that can be tailored to match application, material, fit-up, and welder technique.   Learn More
Industrial USB Port
Quickly upload the latest software and download machine log files to retrieve in-depth information such as diagnostics and machine statistics.   Learn More
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.
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.
ArcReach Heater Compatibility
Take charge of your field preheat and bakeout applications up to 600 degrees Fahrenheit (315°C). This system uses induction heating to generate heat in workpieces, so welders can do their own preheating quickly and safely. A part of the ArcReach technology platform, the ArcReach Heater is an accessory for select ArcReach welding power sources.   Learn More

Not Included

  • Weld leads



Regulated Metal Deposition (RMD)

General Specifications

Title Big Blue® 800 Duo Air Pak™ Truck Mount Spec w/Wireless Interface Control
Industries Interests Construction and Fabrication
Amperage 20 A - 800 A
Weldable Metals Stainless Steel
Rated Carbon Diameter 1/2 in (12.7 mm)
Current Type DC
Max Open Circuit Voltage 85 VDC
Portability Fork Pockets
Lift Eye (Standard)
Cold Weather Starting Aids Engine Block Heater
Glow Plugs
Engine Brand Deutz
Engine Compliance T4F
Engine Idle Speed 1350 RPM
Engine Weld Speed 1800 RPM
Fuel Tank Size 25 gal.
Fuel Type Diesel
Horsepower 65.7 hp
Weld Output CC/CV
Rated Output Separate (dual outputs, each side): CC/DC - 400 A at 36 V; CV/DC - 400 A at 34 V / Paralleled (combined):CC/DC - 700 A at 44 V, 800 A at 38 V; CV/DC - 750 A at 40 V, 800 A at 38 V
Single Phase Auxiliary Continuous Power 12000 W
Single Phase Auxiliary Peak Power 15000 W
Sound Rating Idle: 71.3 dB / Weld: 78.9 dB
Three Phase Auxiliary Continuous Power 20000 W
Three Phase Auxiliary Peak Power 27000 W
Compressor Brand Ingersoll Rand Screw-Type
Compressor Free Air Delivery 60 cfm (1.70 m3/min.)
Compressor Working Pressure 100 psig
Compressor Duty Cycle 100%
Compressor Automatic Shutdown Oil temperature
Applications Mobile Fabrication & MRO
Process Pipe
Net Width 28.5 in
Net Height 46 in
Net Length 69.5 in
Net Weight 2095 lbs




Operator carbon arc gouges on a beam on an outdoor jobsite
Illustration of a technician airing up tires on a service truck with a crane
Operator grinds on a piece of equipment on the jobsite