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

Big Blue 800 Duo Pro (Deutz)

A complete multi-process & multi-operator welder/generator that delivers two independent pipe quality arcs in one complete package. Upgrade to the SF model to unlock advanced RMD® & Pulsed MIG processes with the FieldPro™ Smart Feeder.
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What's Included

  • Digital preset weld meters, automatic idle, 120V block heater, and vandalism lockout (Protects control panel and receptacles).
Multi-Arc Welding
One dependable engine—two independent arcs with up to 400 amps each. Or plug in additional inverters for a true multi-operator 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. Multi-operator welding has never been easier or more versatile.
Infinite Arc Control
Allows the arc characteristics to be changed for specific applications in Stick, TIG, MIG and FCAW.
Heavy-Duty Low-Speed Deutz TD2.9 L4 Tier 4 Final Industrial Diesel Engine
The cleanest, greenest diesel power available. Utilizes Diesel Oxidation Catalyst (DOC) technology to keep the air clean with NO exhaust after treatment maintenance.
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.
Increased Efficiency
More arcs and better fuel economy equal increased profits for your business. Estimated savings are 34 percent with a dual-operator unit versus two single-operator units.
Low OCV Stick (VRD)
Reduces the open-circuit voltage to 15 volts when the welding power source is not in use. This feature increases operator safety without compromising arc starts.
Standard Features
All models include digital preset weld meters, automatic idle, 120V block heater, and vandalism lockout (protects control panel and receptacles).



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

General Specifications

Title Big Blue 800 Duo Pro (Deutz)
Industries Interests Construction
Cross Country Pipeline
Maintenance and Repair - Field Operations
Pipe Fabrication / Construction
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 1869 lbs
Weldable Metals Stainless Steel
Mild Steel
Net Width 28.5 in
Rated Output Separate (Dual Outputs) 400 A at 36 V, 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