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Miller MIG Machine Support

Millermatic 255

Industrial inverter MIG, pulsed MIG, and flux-cored machine with Auto-Line input, Auto-Set Elite setup, program memory, MDX-250 AccuLock S gun support, and spool gun or push-pull aluminum paths.

MIG (GMAW)Pulsed MIG (GMAW-P)Flux-cored (FCAW) Industrial
Millermatic 255

Processes

MIG (GMAW), Pulsed MIG (GMAW-P), Flux-cored (FCAW)

Welding range

20 - 350 A

Input power

Auto-Line 208 - 240 V, single-phase, 50/60 Hz

Wire feed speed

50 - 800 ipm (1.3 - 20.3 m/min.)

Weight

84 lb. (38 kg) machine only; 148 lb. (67 kg) with running gear

Class

Industrial

Feature Highlights

7-Inch Color LCD Setup

Large interface with quick-access Auto-Set and Pulse buttons, soft keys, setup images, and full troubleshooting descriptions.

Auto-Set Elite

Predefined MIG and pulsed MIG settings let operators select wire, gas, wire diameter, and material thickness, then fine-tune as needed.

Program Mode

Favorite weld settings can be saved and recalled for repeat jobs and consistent operator setup.

Pulsed MIG Capability

Pulsed MIG support reduces heat input and spatter, improving control on aluminum, stainless, thin material, and out-of-position work.

Auto-Gun Detect

The machine switches faster between MIG, push-pull, and spool guns by automatically adjusting voltage, wire speed, and timers.

EZ-Latch Running Gear

Optional single and dual cylinder running gear lets the machine detach from the cart for portability while keeping accessory storage available.

Machine Packages

Stock numberCatalog package
907734 Auto-Line 208 - 240 V, 50/60 Hz power source
951766 Auto-Line 208 - 240 V, 50/60 Hz with EZ-Latch single cylinder running gear

Compatible Accessories

EZ-Latch Single Cylinder Running Gear

301449 Running gear with single cylinder rack and storage compartment; latches secure the machine to the cart.

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EZ-Latch Dual Cylinder Running Gear

951769 Dual cylinder running gear with elevated gun and cable rack for cable storage.

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EZ-Latch Dual Cylinder Rack with Elevated Gun and Cable Rack

301481 Converts the EZ-Latch single cylinder running gear into a dual cylinder rack; included with the EZ-Latch dual cylinder running gear.

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Protective Cover

301521 Machine cover with side pocket.

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Argon/Mixed Gas Regulator and Gas Hose

195050 Regulator and gas hose accessory listed on the Millermatic 255 ordering table.

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Millermatic 255 V-Grooved Drive Roll Kits

204579 / 087131 / 079594 / 079595 / 079596 Solid-wire drive roll kits for .024, .030, .030/.035, .035, and .045 in. wire.

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Millermatic 255 V-Knurled Drive Roll Kits

079606 / 079607 / 079608 Flux-cored or difficult-to-feed wire drive roll kits for .035, .045, and .052 in. wire.

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Millermatic 255 U-Grooved Drive Roll Kits

044749 / 079599 Aluminum wire drive roll kits for .035 and .047 in. wire.

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Compatible Guns / Torches

MDX-250 MIG Gun with AccuLock S Consumables

1770041 / 1770042 / 1770043 10 ft., 12 ft., and 15 ft. 250-amp MDX-250 gun options for .035/.045 in. wire; 1770043 is the standard included length.

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MDX-250 MIG Gun with AccuLock MDX Consumables

1770035 / 1770036 / 1770037 Optional 250-amp MDX-250 gun path for .030/.035 in. wire.

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Spoolmatic 15A Spool Gun

195156 15 ft. air-cooled one-pound aluminum spool gun rated 200 A at 100 percent duty cycle.

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Spoolmatic 30A Spool Gun

130831 30 ft. air-cooled one-pound aluminum spool gun rated 200 A at 100 percent duty cycle.

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Spoolmate 200 Spool Gun

300497 20 ft. spool gun rated 160 A at 60 percent duty cycle for .030 - .035 in. aluminum wire and .023 - .035 in. steel/stainless wire.

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Optional Spoolmate 200 Head Tubes

300591 / 300592 / 243385 45-degree head tube, 9 in. extension head tube, and 5 in. head tube options for Spoolmate 200.

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XR-Aluma-Pro Push-Pull Guns

301568 / 301569 15 ft. and 25 ft. air-cooled gooseneck-style push-pull guns for .030 - .047 in. aluminum wire, rated 300 A at 100 percent duty cycle.

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XR-Aluma-Pro Lite Push-Pull Gun

300948 25 ft. air-cooled gooseneck-style push-pull gun for .030 - .047 in. aluminum wire, rated 175 A at 60 percent duty cycle.

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XR-Pistol-Pro Push-Pull Guns

300782 / 300783 15 ft. and 25 ft. air-cooled pistol-grip push-pull guns for .030 - .047 in. aluminum wire, rated 200 A at 100 percent duty cycle.

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Push-Pull Aluminum Drive Roll and Accessory Kits

195311 / 195313 Accessory kits for .035 and .047 in. aluminum that include Millermatic U-grooved drive rolls, nylon wire guides, and contact tips.

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Full machine details

Welding Output

  • 230 A at 25.5 VDC, 60% duty cycle

Wire Capacity

  • Solid/stainless: .023 - .045 in. (0.6 - 1.2 mm)
  • Aluminum: .035 - .047 in. (0.9 - 1.2 mm)
  • Flux-cored: .030 - .045 in. (0.8 - 1.2 mm)
  • Silicon bronze: .030 - .035 in. (0.8 - 0.9 mm)

Material Capacity

  • Mild steel: 24 ga. (0.6 mm) to 1/2 in. (13 mm)
  • Aluminum: 18 ga. (1.2 mm) to 1/2 in. (13 mm)

Included With This Machine

  • Power source with 10 ft. (3 m) industrial power cord
  • 15 ft. (4.6 m) 250-amp MDX-250 MIG gun with Bernard AccuLock S consumables for .035/.045 in. wire
  • 10 ft. (3 m) work cable with clamp and 50 mm Dinse-style connector
  • Flow gauge regulator and gas hose for argon or Ar/CO2 mix
  • .035/.045 in. reversible drive rolls
  • Extra contact tips
  • Material thickness gauge
  • EZ-Latch single cylinder running gear and chain to secure gas cylinder included with package 951766

Dimensions

Machine only: H: 19.24 in. (489 mm), W: 13.75 in. (349 mm), D: 24.25 in. (616 mm). With running gear: H: 32 in. (813 mm), W: 13.75 in. (349 mm), D: 45 in. (1143 mm)

Source: Miller Electric Millermatic 255 Spec Sheet, Issued April 2024, index DC/12.8. Product relationships on this page are kept separate from Amazon monetization data. Amazon buy buttons appear only after the product match, manufacturer, package quantity, and compatibility are verified.

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