Miller Big Blue® 700X Duo Pro

Availability : in stock

Heavy-duty low-speed industrial diesel engine
is designed to operate over 10,000 hours before the first basic overhaul. Backed by worldwide support and service.
Double the amperage output.
Parallel switch combines both independent outputs to a single side. This provides a safe and easy way to run large electrodes, stud weld or carbon arc gouge
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.
Thermal overload protection prevents machine damage if duty cycle is exceeded or airflow is blocked.
Independent generators provide the flexibility, dependability and reliability you need to get the job done right. Power is available anytime the engine is running, even while welding! Generators provide 20,000 watts continuous power (3-phase) / 12,000 watts continuous power (1-phase).
Low OCV stick (VRD) reduces the open-circuit voltage to 15 volts when the welding power source is not in use. This feature is now built in for increased operator safety without compromising arc start performance.


Stick (SMAW)
Flux-cored (FCAW)
Pulsed MIG (GMAW-P)
Air carbon arc (CAC-A)

Heavy Industrial Applications

Pipe welding
Mechanical contractor


Single weld mode 3/8-inch (9.5 mm) carbons
Dual weld mode 1/4-inch (6.4 mm) carbons

Output Range

Single weld mode CC: 40–800 A, CV: 14–50 V
Dual weld mode CC: 20–400 A, CV: 14–50 V

Max. Open- Circuit Voltage

85 VDC
30 VDC

Generator Power Output Rated at 104°F (40°C)

3-phase: 20 kW continuous
1-phase: 12 kW continuous


H: 43 in. (1,092 mm)
W: 28.5 in. (724 mm)
D: 65.125 in. (1,654 mm)


1,729 lb. (784 kg)

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