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Miller Big Blue 400 Pro (Mitsubishi) Diesel Welder - 907733


Designed with the professional in mind, the Big Blue 400 Pro is the best for ease of use, reliability and fuel economy.


Gtin 00715959649513 SKU: 907733 Categories: , ,

Miller Big Blue 400 Pro 907733



The Miller Big Blue 400 Pro with Mitsubishi S4L2 engine is a low speed, EPA compliant compact diesel welder that is ideal for construction, piping and fleet use. It packs up to 400 amps of welding output at 100% duty cycle and provides 12,000 peak watts of auxiliary power. It is capable of carbon arc gouging using up to 1/4″ diameter carbons. When paired with the appropriate wire feeder, it can perform MIG, and flux-cored welding operations.



The Big Blue 400 Pro industrial diesel engine driven welder outperforms competitive machines and comes with the best service and parts support where it matters most, in the harshest real world conditions.



  • MIG (GMAW)
  • Stick (SMAW)
  • Flux Cored (FCAW)
  • Air Plasma Cutting and Gouging (PAC) with Optional Spectrum Models
  • Air Carbon Arc Cutting and Gouging (CAC-A) – capable 1/4″ carbons, rated 3/16″ carbons


Mechanical Contractors
Structural Steelwork


  • Superior Arc Performance
    Four preset DIG settings (Stick)
    Hot Start™ (Stick)
    Lift-Arc™ TIG with Auto-Stop™ and Crater-out
    MIG/FCAW arc performance


  • Ultra-adaptive arc control – Unlike conventional DIG that provides a preset amount of short-clearing current, Miller-exclusive Dynamic DIG technology works on a time-based algorithm that automatically adjusts the amount of current required to clear a short. Delivers a smoother more consistent arc that can be tailored to match application, material, fit-up and welder technique.
  • Simple-to-Set Controls Requires no elaborate procedure – just select process and weld!
  • Thermal Overload Protection Prevents machine damage if the duty cycle is exceeded or airflow is blocked.
  • Mitsubishi SL4L2 four-cylinder diesel engine. Designed to operate over 10,000 hours before the first basic overhaul. Backed by worldwide support and service.
  • Quiet at only 72.1 dba (97 Lwa) at 23 ft at maximum output. Improves work site communication.
  • The Vault-ultimate control board reliability. Hardened solid-state control technology, housed in a sealed vault. The vault’s sealed connections are made through watertight plugs that make these components impenetrable to dust and moisture.
  • Meter Maintenance Displays
    Fuel gauge
    Hour meter function
    Oil change interval
    High coolant temperature and low oil pressure shutdowns
    Low fuel shutdown – engine shuts down before system runs out of fuel, making restarts easy.
  • Auto Remote Sense™ (ARS) Detects if a remote control is plugged into the 14-pin receptacle and eliminates confusion of a remote/panel switch.
  • Other Standard Features
    Digital preset weld meters
    Output contactor control
    Automatic idle
    120 V block heaterSpecs


Air Carbon Arc Cutting and Gouging (CAC-A)
Flux Cored (FCAW)
Stick (SMAW)


Title Big Blue® 400 Pro (Mitsubishi)
Industries Interests Construction
Maintenance and Repair – Field Operations
Mechanical Contracting
Pipe Fabrication / Construction
Cold Weather Starting Aids Engine Block Heater
Glow Plugs
Engine Brand Mitsubishi
Engine Compliance T4F
Engine Idle Speed 1500 RPM
Engine Weld Speed 1800 RPM
Fuel Tank Size 11.5 Gallons
Fuel Type Diesel
Horsepower 24.7 hp
Weldable Metals Stainless Steel
Rated Output 400 A at 24 V, 100% Duty Cycle,350 A at 27 V, 100% Duty Cycle,300 A at 32 V, !00% Duty Cycle
Single Phase Generator Continuous Power 10000 W
Single Phase Generator Peak Power 12000 W
Sound Rating Idle: 68.7 dB, Weld: 72.1
Rated Carbon Diameter 1/4 in (6.4 mm)
Current Type DC
Max Open Circuit Voltage 85 VDC
Amperage Range Amperage Min Max 20 – 400
Portability Lift Eye (Standard)
Trailer (Optional)
Weld Output CC / CV
Net Width 26.25 in
Net Height 32 in
Net Length 56 in
Net Weight 993 lbs
Warranty 3 Years
Miller’s True Blue Warranty


  • Weld leads
Gtin 00715959649513 SKU: 907733 Categories: , ,
Weight 993 lbs
Dimensions 56 × 26.25 × 32 in
Download Big Blue 400 Pro Spec Sheet (Requires Adobe Acrobat Reader)
Download Big Blue 400 Pro Spec Sheet (Requires Adobe Acrobat Reader)

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