New Welders Rewards! | Earn points on every purchase, unlock exclusive perks, and score serious savings.

Welder Supply Company

Steak Madness

Grill Like a Champion

FREE Gifts $75+

$75
T-Shirt + Stickers
$75.00 T-Shirt + Stickers
$2,250
Omaha Steaks Gold Package
$2,250.00 Omaha Steaks Gold Package
$2,750
Omaha Steaks Grand Package
$2,750.00 Omaha Steaks Grand Package
$3,250
Omaha Steaks Deluxe Package
$3,250.00 Omaha Steaks Deluxe Package
$3,750
Omaha Steaks Premium Package
$3,750.00 Omaha Steaks Premium Package
$4,250
Omaha Steaks Platinum Package
$4,250.00 Omaha Steaks Platinum Package
$4,750
Omaha Steaks Diamond Package
$4,750.00 Omaha Steaks Diamond Package
Free Shipping Over $300
Rewards Program Our Locations Contact Us: 1-844-682-0205
All Categories/ SHOP BY BRAND/ Miller Electric/ Miller Welders/

Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866

Part Number: 907866

Ships Free To Lower 48 States

Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866 Big Blue 450 Duo CST Front 907866 Big Blue 450 Duo CST Panel Closed 907866 Big Blue 450 Duo CST Side Right Open 907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866
Big Blue 450 Duo CST Front 907866
Big Blue 450 Duo CST Panel Closed 907866
Big Blue 450 Duo CST Side Right Open 907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866
Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866

Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866

Part Number: 907866
$32,002.00 + Free Shipping $36,961.00*
SAVE $4,959.00
Login or signup to earn 32002 Welders rewards points.

Welding type:

TIG

TIG

Stick

Stick

Engine Driven

Engine Driven

Material type:

Mild Steel

Mild Steel

Stainless Steel

Stainless Steel

Fuel Type:

Diesel

Diesel

Related Products

Miller Big Blue 400 PipePro (CAT) Engine-Driven Welder w/ Wireless Interface Control #907806001 Miller Electric Big Blue 400 PipePro (CAT) Engine-Driven Welder w/ WIC #907806001
(1)
Save $4,731.00
$30,538.00
$35,269.00
Free Shipping
Miller Big Blue® 400 Pro (Kubota) ArcReach® 907732001 Front View Miller Electric Big Blue® 400 Pro (Kubota) ArcReach #907732001
(1)
5 purchased
Save $3,929.00
$25,359.00
$29,288.00
Free Shipping
Lincoln Electric Ranger 305 LPG Engine Driven Welder (Kohler) One-Pak #K3430-2 Lincoln Electric Lincoln Electric Ranger 305 LPG Engine-Driven Welder (Kohler) One-Pak (K3430-2) 2 purchased
Save $1,031.48
$11,911.52
$12,943.00
Free Shipping
Lincoln Electric Maverick 325X Engine-Driven Welder Ready-Pak® 3 #K3581-1-RP3 Lincoln Electric Maverick 325X Welder/Generator w/ Kubota® Diesel Engine (10,000W) Ready-Pak® 3 #K3581-1-RP3
Save $2,565.52
$23,589.48
$26,155.00
Free Shipping
Miller Bobcat 200 Air Pak Diesel #907760 Miller Electric Miller Bobcat™ 200 Air Pak™ Diesel #907760
(1)
4 purchased
Save $4,120.00
$26,592.00
$30,712.00
Free Shipping
Miller Fusion 185 Welder/Generator w/ 120/240V Electric Start #907781 Miller Electric Miller Fusion® 185 Engine-Driven Stick Welder w/ Electric Start #907781
(2)
4 purchased
Save $1,582.00
$5,910.00
$7,492.00
Free Shipping
Lincoln Electric Ranger 330MPX EFI Engine Driven Welder (Kohler) #K4779-1
$1000 MFR Rebate
Lincoln Electric Ranger® 330MPX™ EFI Welder/Generator w/ Kohler® Gas Engine (10,000W) #K4779-1 1 purchased
$10,689.99
Free Shipping
Lincoln Electric Ranger® Air 260MPX™ Multi-Function Engine Driven Welder/Generator #K5238-1 Lincoln Electric Ranger® Air 260MPX™ Multi-Function Engine Driven Welder/Generator #K5238-1
Save $1,665.20
$15,328.80
$16,994.00
Free Shipping
Miller Trailblazer 330 Airpak Engine Driven Welder #907836 Miller Electric Trailblazer 330 Air Pak Engine-Driven Welder, Excel, Battery Charger #907836
Save $3,016.00
$19,474.00
$22,490.00
Free Shipping
Miller Trailblazer 330 Air Pak Engine Driven Welder, Excel, Battery Charger, Pol. Rev., WIC, Cool/Sep. #907836003 Miller Electric Trailblazer 330 Air Pak Welder/Generator, Excel, Battery Charger, Pol. Rev., WIC, Cool/Sep. #9078360…
Save $3,386.00
$21,854.00
$25,240.00
Free Shipping
Miller Trailblazer® 330 Diesel Engine-Driven Welder w/ Excel™ Power & Polarity Reversing (Kubota) #907849004 Miller Electric Trailblazer® 330 Diesel Engine-Driven Welder w/ Excel™ Power & Polarity Reversing (Kubota) #90784900…
Save $3,548.00
$22,895.00
$26,443.00
Free Shipping
Miller Trailblazer® 330 Engine-Driven Welder (Kohler) EFI w/Excel Power #907832001
$1000 MFR Rebate & Free Cover
Miller Electric Trailblazer® 330 Engine-Driven Welder (Kohler) EFI w/Excel Power #907832001 1 purchased
Save $2,925.00
$10,927.00
$13,852.00
Free Shipping
Lincoln Electric Vantage® 322 Engine-Driven Welder (Kubota®) #K2409-5 for sale online Lincoln Electric Vantage® 322 Welder/Generator w/ Kubota® Diesel Engine (11,000W) #K2409-5 1 purchased
Save $2,494.64
$22,936.36
$25,431.00
Free Shipping
Lincoln Electric Vantage® 322 Welder/Generator w/ Kubota® Diesel Engine (11,000W), Ready-Pak® 3 #K2409-5-RP3
Save $3,050.94
$28,057.06
$31,108.00
Free Shipping
Miller Big Blue® 600 Air Pak™ Truck Mount Spec w/Wireless Interface Control #907750004 Miller Electric Big Blue® 600 Air Pak™ Truck Mount Spec w/Wireless Interface Control #907750004
Save $10,972.00
$70,821.00
$81,793.00
Free Shipping
Big Blue® 800 Duo Air Pak™ Truck Mount w/Wireless Interface Control #907752004 Miller Electric Big Blue® 800 Duo Air Pak™ Truck Mount w/Wireless Interface Control #907752004
Save $11,758.00
$75,895.00
$87,653.00
Free Shipping
Blue Star 185 Welder/Generator #907664 compact and portable Miller Electric Miller Blue Star 185 Engine-Driven Welder/Generator – 6.25 Gal, 907664
(1)
52 purchased
Save $1,598.00
$5,969.00
$7,567.00
Free Shipping
907832006 Miller Trailblazer 330 EFI Excel Power PR WIC with Remote
$1000 MFR Rebate & Free Cover
Miller Electric Trailblazer 330 EFI Engine-Driven Welder, Excel, Polarity Reversal, WIC Remote #907832006 1 purchased
Save $3,512.00
$13,122.00
$16,634.00
Free Shipping
  • Efficiency iconDual Operator Efficiency
  • Diesel en </div> <h2>Dual-Operator Diesel Engine-Driven Welder with Quiet Operation and Fuel Efficiency (450A Output) #907866</h2> <div style=

    The Miller Big Blue® 450 Duo CST™ diesel welder/generator delivers reliable dual-operator capability and exceptional arc performance for industrial multi-operator welding applications. Powered by a 24.7 hp Mitsubishi S4L2 Tier 4 Final diesel engine, this welder supports Stick, DC TIG, and Air Carbon Arc Cutting and Gouging processes.

    Each power source provides 400A at 100% duty cycle for single-operator use or 200A per operator at 100% duty cycle for dual-operator use. With a 13.5-hour runtime at 50% load and a quiet operation of 71 dBA at 23 feet, it is ideal for jobsites that require both power and efficiency.

    Download literature of this machine:

    Spec Sheet - Miller Big Blue® 450 Duo CST
    Miller True Blue 3-year warranty

Processes

  • Stick (SMAW)
  • DC TIG (GTAW) Lift-Arc™
  • Air carbon arc (CAC-A) - Rated: 3/16-inch (4.8 mm) carbons (paralleled)
  • Air plasma cutting and gouging with optional Spectrum® models

Highlights

  • Dual-Operator Capability: Allows two welders to operate independently with full control, providing up to 200 amps per operator at 100% duty cycle.
  • Fuel Efficiency: Delivers a 13.5-hour runtime on a 13-gallon tank at 50% load, reducing refueling downtime and operational costs.
  • Quiet Operation: Operates at 71 dBA at 23 feet, quieter than many single-operator models, improving jobsite communication and reducing noise hazards.
  • Adaptive Hot Start™: Prevents electrode sticking by automatically increasing amperage during arc starts for smoother operation.
  • Auxiliary Power Output: Provides 4,000 watts (120/240V) of continuous single-phase power for jobsite tools and lights.
  • Heavy-Duty Mitsubishi Engine: Designed to run 10,000 hours before major overhaul, ensuring long-term durability and reliability.
  • Vandalism Lockout Kit: Lockable hinged steel panel protects front controls and ignition switch for added security.

What's Included

  • Big Blue® 450 Duo CST™ w/ Tweco®-style connectors

Not included: Weld leads

Industries

  • Structural Steel Fabrication
  • Pipeline Construction
  • Heavy Manufacturing
  • General Construction
  • Maintenance and Repair Operations (MRO)

Miller Big Blue® 450 Duo CST™ #907866 - What's Included

Benefits of the Miller Big Blue® 450 Duo CST™

  • Enhanced Productivity: Dual-operator capability allows two welders to work simultaneously, doubling efficiency on the job site.
  • Superior Arc Performance: Adaptive Hot Start™ ensures consistent arc starts on difficult electrodes like E6010.
  • Versatility: Supports Stick, TIG, and air carbon arc gouging processes for a wide range of applications.
  • Energy Efficiency: Reduced fuel consumption lowers operating costs and increases runtime.
  • Durability: Mitsubishi engine delivers long-term performance with minimal maintenance.
  • Jobsite Safety: Quiet operation improves communication and reduces noise hazards.

Fast, Free Shipping & Easy Returns

Enjoy fast, free shipping on the Miller Big Blue® 450 Duo CST™ Diesel Engine-Driven Welder #907866. If you're not completely satisfied with your purchase, take advantage of our easy returns process. For assistance, contact Welders Supply customer support at 1-844-682-0205.

Explore more welding machines and Miller welding supplies at the best prices online, from Welders Supply.

This product replaces these legacy models:

Specifications - Big Blue® 450 Duo CST™
Processes Air Carbon Arc Cutting and Gouging (CAC-A)
Stick (SMAW)
TIG DC (GTAW-DC)
Ind

SHIPPING DIMENSIONS
Height: 34.00 Inches
Width: 58.00 Inches
Length: 28.00 Inches
Weight: 1064 Lb(s) 0 Oz
  • Spec Sheet - Miller Big Blue® 450 Duo CST