Miller Big Blue® 800X Duo™ Air Pak with ArcReach® – Dual Operator Engine-Driven Welder (MR907763-1)

The Miller Big Blue® 800X Duo™ Air Pak with ArcReach® Technology is a powerful, engine-driven welding system designed to deliver maximum output, dual-operator capability, and unmatched jobsite efficiency. Built for heavy-duty industrial applications, this machine combines 700 amps of welding power, 20,000 watts of generator output, and true multi-arc welding capability — all powered by one reliable industrial diesel engine.

Engineered for rail, mining, pipe welding, construction, and maintenance fleets, the Big Blue 800X Duo Air Pak enables multiple operators to weld simultaneously with premium arc quality and zero arc interaction, dramatically improving productivity and profitability.

---

ArcReach® Technology – More Arc-On Time, Less Walking

ArcReach® welding technology allows operators to adjust welding parameters remotely at the weld joint, reducing non-value-added time and improving jobsite safety.

Key Benefits

• Maximises arc-on time and weld quality

• Eliminates unnecessary walks to the power source

• Improves safety on large or cluttered job sites

• Ideal for multi-operator and large-scale operations

---

Unmatched Power & Dual-Operator Performance

More Welding Power

• Up to 700 amps of weld output

• 20,000 watts of peak generator power

True Multi-Arc Welding

• One engine, two independent welding arcs

• Up to 400 amps per operator in dual-operator mode

• Premium arc quality with no arc interference

Expandable Multi-Operator Capability
Add inverter-based power sources (e.g. XMT® multi-process machines) for a true multi-operator platform.

Example Configuration:

• 2 × XMT machines = 4 operators, up to 200 amps each

---

Simple, Flexible Operation

Simple Paralleling Switch

• Instantly switch between single-operator and dual-operator modes

• Single-Operator Mode: Up to 700 amps

• Dual-Operator Mode: Up to 400 amps per side

Auto Remote Sense™

• Standard 14-pin receptacle

• Easy connection for remote controls and wire feeders

---

Advanced Controls & Monitoring

Digital Preset Weld Meters

• Clear, accurate parameter display

SunVision™ Digital Meters

• Exceptional visibility at any angle

• Readable even in direct sunlight

Industrial USB Port

• Upload software updates

• Download machine logs, diagnostics, and performance data

---

Generator & Auxiliary Power Output

Auxiliary Power Configuration

• 1 × 415–380V, 32A socket

• 2 × 240V, 15A sockets

• RCD protection

*Generator auxiliary power is 60Hz and intended for welding-related equipment such as grinders, drills, and lighting. Some 50Hz Australian equipment with induction motors may not be suitable. Always confirm with the equipment manufacturer.

---

Arc Performance & Efficiency

Arc Control

• Improved control for stick and solid wire welding

• Easier tuning for difficult materials and out-of-position welds

Increased Efficiency

• More arcs + better fuel economy = higher profitability

• Estimated 34% fuel savings compared to running two single-operator machines

---

Heavy-Duty Industrial Design

• HD powder coat with zinc-rich primer for superior corrosion resistance

• Low-speed Tier 4i industrial diesel engine

• Designed for harsh environments and fleet use

---

Standard Features

• ArcReach® Technology

• Digital preset weld meters

• Automatic idle control

• Vandalism lockout

---

Welding Processes Supported

• Stick (SMAW)

• RMD®

• Pulsed MIG

• MIG (GMAW)

• Flux-Cored (FCAW)

• DC TIG (GTAW)

• Air Carbon Arc (CAC-A)

---

Ideal Applications

• Railroad Maintenance

• Pipe Welding

• Mining Maintenance

• Mechanical Contracting

• Maintenance & Repair Rigs

• Construction & Infrastructure

---

Product Information

• Model: Big Blue® 800X Duo™ Air Pak

• Technology: ArcReach®

• Weld Output: Up to 700A

• Generator Power: 20,000W Peak

• Engine: Heavy-Duty Low-Speed T4i Industrial Diesel

• Part Number / SKU: MR907763-1