Miller Millermatic 255 Auto-Line Pulsed MIG Welder, 250A, 208-575V, 907964
The Miller Millermatic 255 Auto-Line is a 250-amp inverter pulsed MIG welder for MIG, flux-cored and pulsed MIG welding in light manufacturing and fabrication. Auto-Line accepts any single-phase input from 208 to 575 V with no manual linking, so the machine can move between facilities with different line voltages and copes with dirty or unreliable power.
Setup runs through a 7-inch color LCD, where Auto-Set Elite supplies predefined weld settings for operators of every skill level and program mode saves and recalls favorite settings. Pulsed MIG lowers heat input to reduce distortion on thin material, and the reduced spatter means less grinding and rework after welding. At 84 lb for the machine alone, this inverter MIG welder weighs more than 50 percent less than the Millermatic 252.
The machine can be mounted on EZ-Latch running gear to roll around the work area, and loosening the retaining knob and rotating the latches frees it for work cells and confined spaces. The package includes a 15 ft (4.5 m) Miller MDX 250 MIG gun that takes .035/.045 in. wire and Bernard AccuLock S consumables, a 10 ft power cord, a work cable and clamp with a 50 mm Dinse-style connector, a flow gauge regulator and gas hose, extra contact tips, reversible drive rolls and a material thickness gauge.
Highlights
Auto-Line input: any single-phase supply from 208 to 575 V, no manual linking
250-amp inverter for MIG, pulsed MIG and flux-cored welding
7-inch color LCD with Auto-Set Elite predefined settings and a program mode
Machine alone weighs 84 lb and can mount on EZ-Latch running gear
Includes a 15 ft (4.5 m) Miller MDX 250 gun and .035/.045 in. (0.9/1.2 mm) drive rolls
Specifications
Brand | Miller |
Manufacturer part number | 907964 |
Processes | MIG, pulsed MIG, flux-cored |
Output class | 250-amp inverter |
Input voltage | 208-575 V, single-phase (Auto-Line) |
Display | 7-inch color LCD |
Weight | 84 lb (machine only) |
Power cord | 10 ft (3 m) |
MIG gun | 15 ft (4.5 m) Miller MDX 250 |
Drive rolls | .035/.045 in. (0.9/1.2 mm), reversible |
Work cable | 10 ft (3 m) with clamp and 50 mm Dinse-style connector |
Gas equipment | Flow gauge regulator and gas hose for argon or AR/CO2 mix |
What's in the box
Power source with 10 ft (3 m) power cord
15 ft (4.5 m) Miller MDX 250 MIG gun for .035/.045 in. (0.9/1.2 mm) wire (accepts Bernard AccuLock S consumables)
10 ft (3 m) work cable and clamp with 50 mm Dinse-style connector
Flow gauge regulator and gas hose for argon or AR/CO2 mix
Extra contact tips
.035/.045 in. (0.9/1.2 mm) reversible drive rolls
Material thickness gauge
Good to know
Check the input power (voltage, phase and amperage) against your supply before you order.



