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Miller Big Blue® 400 PipePro® (Mitsubishi) #907703001

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$18,657.45 $24,168.00 Reduced Price You Save $5,510.55
Product Number: 907703001
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Miller Big Blue® 400 PipePro® (Mitsubishi) #907703001

Heavy-Duty Low-Speed Mitsubishi S4L2 Industrial Diesel Engine

The S4L2 is designed to run 10,000 hours before any major overhaul is necessary. Backed by worldwide support and service.

All painted sheet metal is pretreated with a zinc-rich primer to provide extra protection against rust & corrosion (comparable to stainless steel).

ArcReach® Technology

Exclusive ArcReach technology uses existing weld cables to communicate process adjustment commands back to the welder generator. With an ArcReach system, amperage & voltage are conveniently located at the operator's fingertips - not back at the power source.

All Day Consistency

Unlike traditional DC style generators that have a hard time maintaining a consistent output due to daily fluctuations in ambient temperature, the advanced controls on the PipePro stabilize and keep output right where you set it.

Industrial USB Port

Quickly upload the latest software and download machine log files to retrieve in-depth information such as diagnostics and machine statistics.

Dynamic DIG

Unlike conventional DIG that provides a preset amount of short-clearing current, Miller’s proprietary Dynamic DIG works on a time-based algorithm that automatically adjusts the amount of current required to clear a short. What does this mean? A smoother more consistent arc that can be tailored to match application, material, fit-up, and welder technique.

Line-X® Top Cover

Workbench tough top cover provides superior impact, corrosion, and abrasion protection to ensure your machine works longer, even in the most rugged environments.

Designed for the Welding Rig

The Big Blue 400 PipePro is the smallest, lightest and most powerful welder in its class. This means less wear & tear on the truck chassis, more room and capacity for equipment, and greater visibility out the rear window of the truck.

Wireless Remote Compatible

Eliminate pesky control cords and remote boxes through the use of Miller's wireless hand control (#300430). Easily control welding output up to 300 ft. away from the Big Blue without ever having to make a trip back to the truck. Wireless Antenna Kit recommended (#300749).

Other Standard Features

Output contactor control, Digital Meters with SunVision™, automatic idle, thermal overload protection, and 120-volt engine block heater.


  • ArcReach® Remote Control Technology Learn More
  • Line-X® Top Cover
  • Lift-Off Service Door
  • Engine Coolant Temperature Gauge


Shop all Miller welding machines, welding machine accessories, and used welders & equipment for great deals and affordable prices.


  • Air Carbon Arc Cutting and Gouging (CAC-A)
  • Flux Cored (FCAW)
  • MIG (GMAW)
  • Pulsed MIG (GMAW-P)
  • RMD
  • Stick (SMAW)


Title Big Blue® 400 PipePro® (Mitsubishi)
Industries Interests Cross Country Pipeline
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 gal.
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, 100% 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 dB dB
Carbon Diameter 1/4 in (6.4 mm)
Current Type DC
Max Open Circuit Voltage 85 VDC
Amperage Range 20 - 400
Net Width 26.25 in
Net Height 32 in
Net Length 56 in
Net Weight 993 lbs
Warranty Engine Warranties 
Miller's True Blue Warranty
Portability Lift Eye (Standard)
Trailer (Optional)
Weld Output CC / CV


Height: 34.00 Inches
Width: 28.00 Inches
Length: 58.00 Inches
Weight: 1052 Lb(s) 0 Oz

Product Questions and Answers

Q - How is this different from the Big Blue 400 Pro? A - The Pipe Pro is optimized for pipe welding and designed to maintain constant output for pipe welding despite daily use or changes in environment.
Q - What engine does it have? A - The Miller Big Blue 400 Pipe Pro (Mitsubishi) has a Mitsubishi S4L2 four-cylinder diesel engine.

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