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Big Blue 450 Duo CST

The Big Blue 450 Duo CST is a rugged, compact, fuel-efficient diesel welder/generator that provides two superior arcs in one economical package.

Superior Stick arc performance
even on the difficult-to-run electrodes like E6010.

450 duo CST Adaptive Hot Start™ for Stick arc starts automatically increases the output amperage at the start of a weld should the start require it.Prevents the electrode from sticking and creating an inclusion.

Lift-Arc™ start provides TIG arc starting without the use of high frequency.

Remote amperage control provided through 14-pin receptacle on front of the machine. This permits use of standard remote amperage control devices.

Vandalism lockout kit. Lockable hinged steel panel protects front control panels and ignition switch.

Meter maintenance displays. Hour meter function.Oil change interval.High coolant temperature and low oil pressure shutdowns.Low fuel shutdown —engine shutsdown before system runs out of fuel,making restarts easy

Quiet operation. At just 72.2 decibels at 23 feet (7 m), it's quieter than most single-operator models, improving jobsite communication and safety.

Thermal overload protection prevents machine damage if the duty cycle is exceeded or airflow is blocked.

High efficiency. Three-phase, rotating-field generator requires less fuel and horsepower to operate.


Weld Mode/Process Output Mode Weld Output Range Weld Output Rated at 122° F (50° C) Max.Open-Circuit Voltage Generator Power Output Rated at 122 F (50° C) Sound Levels at Rated Output,23 ft. (7 m) Dimensions Weight(without fuel)*
CC/DC(Stick/TIG) Separate (dual outputs) 5–225 A (each side)5–280 A (one side only) USA Model:175 A, 27 VDC, 100% duty cycle International Model:200 A, 28 VDC, 100% duty cycle 77 3-phase: 12,000 watts, 240 VAC, 60 Hz continuous
1-Phase: 10,000 watts,120/240 VAC, 60 Hz continuous
72.2 dB (97 Lwa) H: 32 in. (813 mm)
W: 26.25 in. (667 mm)
D: 56 in. (1422 mm)
Net: 1064 lb. (483 kg)
Ship: 1114 lb. (505 kg)
Paralleled(combined) 10–450 A USA Model:350 A, 27 VDC, 100% duty cycle International Model:400 A, 28 VDC, 100% duty cycle

Performance Data

450 duo CST-1

Function Guide

450 duo CST-2
  • 1. Output Light
  • 2. On/Off Switch
  • 3. Weld Process Selector Switch
  • 4. Overtemp Ligh
  • 5. Amperage Adjustment Control (5–280 Amps)
450 duo CST-3
  • 6. Standard 14-pin Receptaclefor simple connection of remote controls and wire feeders. It features Auto Remote Sense™ which automatically switches from panel to remote amperage/voltage (A/V) control with remote connected. Eliminates confusion of the panel/remote A/V switch.
  • 7. Negative (–) Weld Output Terminal
  • 8. Glow Plugs assist in cold weather starting.
  • 9. Meter Maintenance Displaysshow fuel level, engine hours, oil change interval and high temp/low pressure/low fuel shutdown information.
  • 10. Engine Control Switchis used to start and stop the engine and select power range.
  • 11. 120/240 V, 50 A, AC Receptacle
  • 12. 120 and 240 V Circuit Breakers
  • 13. 120 V, 20 A, AC Receptacles with Ground Faul
450 duo CST-4
  • 14. 120 V, 20 A, AC Receptacles with Ground Fault
  • 15. 240 V Earth Leakage Circuit Breaker
  • 16. 120 V Circuit Breakers
  • 17. 120 V/16 A and 240 V/16 A, AC Receptacles

What Makes Miller® Industrial Engine Drives So [TOUGH]

Rigorous Testing for Tough, Real-World Conditions

To prove our machines go to the limit, Miller industrial engine drives are put to the test in very extreme environmental conditions. 450 duo CST-5 Airborne dust and sand
Critical components are exposed to abusive airborne particles in a special testing chamber for weeks, helping make sure they'll operate while facing extreme levels of dirt, dust or sand on the jobsite.
Humidity and corrosion
Inside our Houston testing room, critical components are subjected to extended moisture and corrosive salt exposure to ensure they'll run even when exposed to humid climates, corrosive coastal environments, and driving rain.
Temperature extremes
Miller industrial engine drives are tested to ensure performance in scorching heat. All Miller engine-driven machines are weld rated at 104 degrees Fahrenheit, but actual tests are conducted up to 122 degrees Fahrenheit to assure peak performance
Jobsite/over-the-road abuse
Miller industrial engine drives are shaken for hours on transportation bed simulators,subjected to severe vibration, and test-dropped and jerked to ensure they'll withstand the stresses that can shut down competitive machines
Continuous operation
Miller industrial engine drives run day and night, in all weather conditions, to assure they'll perform without interruption in the field.

450 duo CST-6

Why Industrial Engine Drive Customers Choose Miller

The ultimate test of Miller reliability is how it performs in the field. Read stories demonstrating our superior reliability at MillerWelds.com.

Typical Installations

Electrode Hot

Stick (SMAW) Basic Equipment

450 duo CST-7

Note: Illustration at right shows single arc installation. For dual arc installations, two sets of cables, two remote controls and two electrode holders are needed

Lift-Arc™ TIG (GTAW) Basic Equipment

450 duo CST-8

Note: Illustration at right shows single arc installation. For dual arc installations, two sets of cables and two TIG torches are needed

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