Big Blue® 450 Duo CST™

Big Blue® 450 Duo CST™


The Big Blue 450 Duo CST is a rugged, compact, fuel efficient diesel welder/generator that provides 2 superior arcs in one economical package.


Multi-function Fuel Gauge
Displays fuel level and engine hours, and can be customized to set oil change interval reminders. In the case of high coolant temperature, low oil pressure, or low fuel level, the engine will shut down to prevent damage, or make restarting easier.
Remote Amperage Control
Provided through 14-pin receptacle on front of the machine. This permits use of standard and wireless remote amperage control devices.

Heavy-Duty Low-Speed Mitsubishi S4L2 Industrial Diesel Engine
Used in industrial applications around the world, the S4L2 is designed to run 10,000 hours before major overhaul. Backed by worldwide support and service.


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.


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.


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 the difficult-to-run electrodes like E6010


General Specifications

TitleBig Blue® 450 Duo CST™ (Mitsubishi)
Industries InterestsInfrastructure
Maintenance and Repair - Field Operations
Pipe Fabrication / Construction
Cold Weather Starting AidsGlow Plugs
Engine BrandMitsubishi
Engine ComplianceT4F
Engine Idle Speed1800 RPM
Engine Weld Speed1800 RPM
Fuel Tank Size11.5 gal.
Fuel TypeDiesel
Horsepower24.7 hp
Weldable MetalsStainless Steel
Rated OutputSeparate (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
Sound Rating72.2
Three Phase Generator
Continuous Power
12000 W
Rated Carbon Diameter3/16 in (4.8 mm)
Current TypeDC
Max Open Circuit Voltage77 VDC
Amperage RangeAmperage Min Max 5 - 450
PortabilityLift Eye (Standard)
Trailer (Optional)
Weld OutputCC
Net Width26.25 in
Net Height32 in
Net Length56 in
Net Weight1064 lbs