Miller Millermatic 255 Auto-Line Pulsed MIG Welder with Running Gear, 208-575V
The Miller Millermatic 255 Auto-Line Pulsed MIG Welder with Running Gear is a 250-amp inverter welder on running gear, built for flux-cored, MIG and pulsed MIG welding in light manufacturing and fabrication. Auto-Line takes any single-phase input from 208 to 575 V with no manual linking, which suits jobs that move the machine between different line voltages.
Latches secure the welder to the EZ-Latch running gear, and loosening the retaining knob and rotating the latches frees it for a work cell or confined space, while loading the machine and its running gear into a truck needs no lift truck. At 84 lb for the machine alone, it weighs more than 50 percent less than the Millermatic 252, and Auto-Line copes with dirty or unreliable power.
Setup runs through a 7-inch color LCD with Auto-Set Elite predefined weld settings and a program mode that saves favorite settings. Pulsed MIG lowers heat input to reduce distortion on thin material and cuts spatter, so there is less grinding afterward. 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
Running gear included; the welder can be released from it for tight spaces
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, over 50 percent less than the Millermatic 252
Specifications
Brand | Miller |
Manufacturer part number | 951000271 |
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
Running gear
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.




