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Miller Big Blue 450 Duo CST (Mitsubishi) 907477

Part Numbers: 907477
UPCs: 715959555524
1 Review

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Miller Big Blue 450 Duo CST (Mitsubishi) 907477
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Welding type:





Engine Driven

Engine Driven

Material type:

Mild Steel

Mild Steel

Stainless Steel

Stainless Steel



  • Multi-Process
  • Multi-Phase
  • Engine Driven
  • 3-Year Warranty

Miller Big Blue 450 Duo CST (Mitsubishi) #907477

The Big Blue 450 Duo CST is a durable, compact, fuel-efficient diesel welder/generator. The 450 can provide two simultaneous arcs while remaining economical and effective for operators. 

Big Blue 450 Duo CST Features:

Multi-function Fuel Gauge - Clear fuel level, engine hours, and customizable oil change reminders. The engine has an automatic shut down feature to prevent further damage in the case of high coolant temperature, low oil pressure, or low fuel level.

Heavy-Duty Low-Speed Mitsubishi S4L2 Industrial Diesel Engine - The Mitsubishi S4L2 is designed to run for 10,000 hours before any major overhaul is necessary. Backed by worldwide and world-class support and service.

Adaptive Hot Start™ For Stick Arc Starts - Automatically increases the output of a weld should the start require it.  Prevents the electrode from sticking and creating an inclusion.

Superior Stick Arc Performance - Even on difficult-to-run electrodes like E6010

Remote Amperage Control - Provided through a 14-pin receptacle in front of the machine.  This permits the use of standard and wireless remote amperage control devices.

Quiet Operation - At just 72.2 decibels at 23 feet (7 m), it's quieter than the vast majority of other single-operator models, improving job site communication and safety.

High Efficiency - Three-Phase, rotating-field generator requires less fuel and horsepower to operate.

Vandalism Lockout Kit -  Lockable hinged steel panel protects front control panels and ignition switch.

See our line of quality welding equipment and welding machine accessories or view our full selection of quality welding machines.

Big Blue 450 Duo CST Processes:

  • Air Carbon Arc Cutting and Gouging (CAC-A)
  • Stick (SMAW)

Miller Big Blue 450 Duo (Mitsubishi) Specifications:

Industries Interests Construction
Maintenance and Repair - Field Operations
Pipe Fabrication / Construction
Work / Service Trucks
Carbon Diameter 3/16 in (4.8 mm)
Cold Weather Starting Aids Glow Plugs
Current Type DC
Engine Brand Mitsubishi
Engine Compliance T4F
Engine Idle Speed 1800 RPM
Portability Lift Eye (Standard)
Trailer (Optional)
Engine Weld Speed 1800 RPM
Fuel Tank Size 11.5 Gallon
Net Height 32 in
Fuel Type Diesel
Net Length 56 in
Horsepower 24.7 hp
Max Open Circuit Voltage 77 VDC
Net Weight 1064 lbs
Weldable Metals Steel
Stainless Steel
Net Width 26.25 in
Rated Output Separate (Dual Outputs) 175 A at 27 V, 100% duty cycle
Paralleled (Single Output) 350 A at 27 V, 100% duty cycle
Single Phase Generator Continuous Power 10000 W
Warranty Engine Warranties
Miller's True Blue Warranty
Sound Rating 72.2 dB
Three Phase Generator Continuous Power 12000 W
Amperage Range 5 - 450


Height: 34.00 Inches
Width: 28.00 Inches
Length: 58.00 Inches
Weight: 1114 Lb(s) 0 Oz

Manufacturer Reviews

By: RobOn2ndShift
I've been using this machine on job for about 6 months. I am a professional UA pipe welder at a refinery. We have been using this machine to weld 6010 roots with 7018 fill and caps, and tig for chrome and stainless. The idea of 2 arcs from one machine is why the boss decided on this machine. The Good: This machine will start faster than any other machine on a cold North Dakota morning than any other machine on the job. Fairly quiet = low speed diesel. Two guys can roll this machine on flat ground when its on the optional trailer. Does a good job on 6010 up hand roots. This machine is producing X-ray quality welds. The So So: My biggest complaint is the inverter welders that they use in this machine. I find that 7018 on these CST 280 is lacking. Miller says there is a hot start built in but I don't see it. Caps using the CST 280 are not as smooth as most machines I use. When using 1/8 rod or bigger in position sticking the rod becomes alot worse if set to XX18 Smooth. To counter act that I have to set it to XX18 Stiff. This makes the bead more choppy looking. Overall I would say that the CSTs are average industrial machines. Decent all around but not great. The Bad: The inverters used in this machine run around 10 amps hotter than most. There is not a digital display for amps. The difference for 5 amps on the dial seems to be just turning the dial a hair. And not a big one! We have been given 14 pin remotes as of lately and this helps dial in the heat a little better. Other Stuff: Millers website advertises this machine as having 3 phase but as far as I can tell this is all internal to power the 2 inverter welding power supplies. On the current job we also have a XMT 350 and another separate CST 280. The XMT runs great and is one of the standards that I judge most inverter machines. The separate CST runs the same as I described above. This machine will work for 90 percent of the welders out there. Just not my favorite.

Product Questions and Answers

Q - Can the Miller Big Blue 450 Duo CST (Mitsubishi) run wire feed machines? A - It is not recommended to run a voltage sense wire off of the Miller Big Blue 450 Duo CST (Mitsubishi).
Q - What battery is used to start the Miller Big Blue 450 Duo CST (Mitsubishi)? A - BCI 35 or 55 will work.

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