Processes
Stick (SMAW), DC TIG (GTAW), Air carbon arc cutting and gouging (CAC-A)
Miller Stick / Engine-Drive Support
Big Blue 450 Duo CST
Dual-operator diesel engine-driven stick/TIG welder with two CST-style outputs for field productivity.
Stick (SMAW)DC TIG (GTAW)Air carbon arc cutting and gouging (CAC-A)
Heavy industrial dual-operator diesel engine-drive
Welding range
Separate outputs: 5 - 225 A each side. Single side: 5 - 280 A. Paralleled: 10 - 450 A.
Engine
Mitsubishi S4L2 diesel, 24.7 hp at 1,800 rpm
Auxiliary power
Single-phase. Peak: 10,500 W. Continuous: 8,900 W.
Weight
1,064 lb. (483 kg)
Class
Heavy industrial dual-operator diesel engine-drive
Machine Packages
| Stock number | Catalog package |
|---|---|
| 907866 | Mitsubishi |
Welding Output
- Separate: 175 A at 27 V each side, 100% duty cycle
- Paralleled: 350 A at 34 V, 100% duty cycle
Key Support Notes
- Two separate outputs with Tweco-style receptacles
- Simple process select for E6010 and E7018 stick electrodes
- Vandalism lockout kit protects control panels
- Dual-operator productivity
Accessories and Process Paths
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Full KVA Adapter Cord
300517 Full KVA adapter cord listed for Bobcat, Trailblazer, and Big Blue engine-drive models.
Support path pendingAmazon link: Needs verification.
Full KVA Plug Kit
119172 Single-phase 120/240 V, 50 A plug kit listed for Bobcat, Trailblazer, and Big Blue models.
Support path pendingAmazon link: Needs verification.
Protective Cover
195301 Protective cover for Big Blue 400 Pro, Big Blue 400 PipePro, and Big Blue 450 Duo CST.
Support path pendingAmazon link: Needs verification.
HWY-Mid Frame Trailer
Trailer path listed for Bobcat, Trailblazer, Big Blue 400 Pro, Big Blue 400 PipePro, and Big Blue 450 Duo CST.
Support path pendingDimensions
H: 32 in. / 37 in. to top of exhaust, W: 26.25 in., D: 56 in.
Source: Miller Electric 2026 Full-line Catalog, catalog page 87, literature ED/5.8. Machine and accessory relationships are source-backed catalog references. Amazon purchase links stay separate and only appear after independent product verification.