Miller Millermatic® 255 – MIG/Pulsed MIG Welder (208/240V)

The Miller Millermatic® 255 is a high-performance MIG welder engineered for light manufacturing, fabrication, auto repair, and metalworking shops that demand efficiency, versatility, and weld quality. Designed with Auto-Set™ Elite technology, pulsed MIG capabilities, and an intuitive color display, this welder takes the guesswork out of setup and reduces costly rework—boosting productivity across your operation.

Compact yet powerful, the Millermatic® 255 connects to 208V or 240V input power and delivers precise performance on a wide range of materials, including aluminum, stainless steel, and mild steel up to 1/2 inch thick. At just 84 lbs, it’s lightweight enough for portability while packing the welding strength professionals expect.

Key Features

• Auto-Set™ Elite – Automatically sets optimal weld parameters for ease of use and consistency.

• Pulsed MIG Technology – Minimizes spatter, reduces heat input, and delivers cleaner, higher-quality welds.

• User-Friendly Color Display – 7-inch interface allows for quick adjustments and simplified training.

• Dual-Voltage Compatibility – Runs on both 208V and 240V single-phase input power.

• Heavy-Duty Capability – Welds material thicknesses from thin gauge sheet metal up to 1/2" plate.

• Bernard® AccuLock™ S Consumables – Ensure smooth, consistent wire feeding and reduce downtime.

• Portability – At 84 lbs, the Millermatic® 255 is compact enough for shop mobility, with optional running gear for added convenience.

• True Blue® Warranty – Backed by Miller’s industry-leading 3-year warranty.

What’s Included

• Millermatic® 255 Power Source with 10 ft. (3 m) power cord

• 15 ft. (4.5 m) 250-amp MDX™-250 MIG Gun with AccuLock™ S Consumables (.035"/.045" wire)

• 10 ft. (3 m) Work Cable and Clamp with 50 mm Dinse-style Connector

• Flow Gauge Regulator and Gas Hose (Argon or AR/CO₂ mix)

• Extra Contact Tips (.035" & .045")

• Reversible Drive Rolls for .035"/.045" wire

• Material Thickness Gauge

Specifications

• Processes: MIG (GMAW), Pulsed MIG (GMAW-P), Flux-Cored (FCAW)

• Amperage Range: 20 – 350 A

• Rated Output: 230 A at 25.5 V, 60% duty cycle

• Max Open Circuit Voltage: 87 VDC

• Wire Feed Speed: 50 – 800 IPM (1.3 – 20 m/min)

• Wire Diameter Range:

  • Aluminum: 0.035" – 0.047" (0.9 – 1.2 mm)

  • Stainless: 0.023" – 0.045" (0.6 – 1.2 mm)

  • Solid Steel: 0.023" – 0.045" (0.6 – 1.2 mm)

  • Flux-Cored: 0.030" – 0.045" (0.8 – 1.2 mm)

  • Silicon Bronze: 0.030" – 0.035" (0.8 – 0.9 mm)

• Material Thickness: Aluminum 18 ga. – 1/2" | Mild Steel 24 ga. – 1/2"

• Spool Size: 12 in. (305 mm)

• Dimensions: 26.25" L x 13.75" W x 19.25" H

• Weight: 84 lbs

• Input Power: 208/240V single-phase, 50/60 Hz

• Warranty: Miller True Blue® 3-Year Warranty

Applications

• Light Manufacturing & Fabrication

• Custom Auto Repair & Restoration

• Racing & Motorsports

• Farm & Ranch Maintenance

• Welding Education & Training

Why Choose the Millermatic® 255?

The Miller Millermatic® 255 MIG/Pulsed MIG Welder is designed for professionals who need power, precision, and productivity in one compact machine. From fabrication shops to automotive work, it delivers cleaner welds, faster setup, and long-term reliability—backed by Miller’s True Blue® Warranty.