Big Blue® 400 PipePro® (Mitsubishi)

Big Blue® 400 PipePro® (Mitsubishi)

Next-generation, rugged, low-speed diesel welder/generator designed for the transmission pipeline contractor.

Mitsubishi Blue

Mitsubishi Stainless

CAT Blue

CAT Stainless


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.
HD Powder Coat
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.   Learn More
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.   Learn More
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.   Learn More
Line-X® Top Cover
Workbench tough top cover provides superior impact, corrosion and abrasion protection.
Designed for the Welding Rig
The Big Blue 400 PipePro is the smallest, lightest and most powerful welder in it’s 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.
Other Standard Features
  • Output contactor control
  • Digital Meters with SunVision™
  • Automatic idle
  • Thermal overload protection
  • 120-volt engine block heater

Not Included

  • Weld leads


Product Literature


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

General Specifications

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
Rated Carbon Diameter 1/4 in (6.4 mm)
Current Type DC
Max Open Circuit Voltage 85 VDC
Amperage Range 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
Engine Warranties
Miller's True Blue Warranty




Reviews & Ratings

Question & Answers