Miller Big Blue Air Pak

A complete mobile welding, air and power workshop for on-site maintenance and fabrication.

Welder/Generator/Air Compressor

Provides a go anywhere solution for field jobs requiring welding, gouging or cutting, compressed air and AC auxiliary power generation.

The Vault

Ultimate control board reliability. 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.

Ultra-Reliable Industrial Rotary Screw Air Compressor

Belt-driven with automatic belt tensioner with a life expectancy of 30,000 hours.

Independent Compressor Controls

On/off switch for applications not requiring compressed air. At idle speed will produce 100 PSI at 40 CFM.

Enclosed Robust Case Design

Protects internal components from impact and allows air flow to cool and prolong the life of the engine. Also reduces sound levels.

Weatherproof Lexan® Nameplate

Resists cracking and fading, and is color-coded for ease of operation.

Low Maintenance

Easy single-side access to engine and 500 hour oil changes for both engine and compressor.

Quiet Operator

At only 70 dB (95 Lwa) when idle, 79 dB (104 Lwa) at maximum output. Improves work site communications.


Automatically enhances Stick welding, especially on pipe, by focusing the arc and preventing the electrode from going out.

Heavy Duty Low-Speed Industrial Turbocharged Diesel Engine

Provides ample power at high altitudes.

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.

Hot Start™

Provides positive Stick electrode starts to make it easy to start all types of electrodes.

Low OCV – Voltage Reduction Device

Provides open circuit voltage below 35 Volts for increased operator safety.

Independent Generator Power

4000 watts of continuous output for lighting and power tools, even while welding at 500 Amps.

Auxiliary Power*

  • 2 X 15 Amp Sockets.
  • RCD.

*Generator auxiliary power is 60Hz, and intended for operating equipment associated with welding, such as angle grinders, drills  and floodlights. Some Australian 50Hz equipment incorporating induction motors, such as pumps, fans, air compressors, refrigeration or air-conditioners, may not operate correctly and could be damaged. Refer to appliance supplier or manufacturer to confirm suitability.

Technical Data

Welding Mode:  CC/CV/DC

Amp/Volt Range: 20 - 7500 A

Rated Output: 600 A at 44V, 400% Duty cycle, 550A at 42V 60% Duty cycle, 500A at 40 V 100% Duty cycle

Generator Power: Peak 5 500 Watts, Continuous: 4 000 Watts, 17 A, 240 VAC 60 Hz

Dimensions (mm): H 1092  W: 724 D: 1654

Weight (without Fuel): 876 kg

Applications and Processes


Railroad Maintenance

Mining Maintenance

Maintenance and Repair Rigs


Submerged Arc


Flux Cored


DC Stick

Air Compressor

Air Carbon Arc