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Miller Millermatic 255 is well renowned  MIG (Metal Inert Gas) welding machine model, manufactured in USA, and used extensively in fabrication, automotive repair, and the construction industry.

MIllermatic 255 ensures superior weld consistency by using Advanced Inverter technology and synergic control technology, coupled with an Auto set feature where the machine sets the optimal welding parameters.

The machine comes with 3 Years International Warranty

Easy to use machine to increase efficiency and productivity for the light manufacturing and fabrication users. Color screen featuring Auto-Set Elite and Pulsed MIG. This all-in-one welder connects to 208 or 240 volt input power. Welds up to 1/2” aluminum, stainless and mild steel.


  • Power source with 10 ft. (3 m) power cord
  • 15 ft. (4.5 m) 250-amp MDX™-250 MIG gun w/ Bernard® AccuLock™ S consumables for .035/.045 in. (0.9/1.2 mm) wire
  • 10 ft. (3 m) work cable and clamp and 50mm 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

Easy-to-understand interface
7-inch color LCD display ensures proper machine setup and parameter selection, reducing setup time and increasing weld time.

Pulsed MIG welding delivers higher quality
Lower heat input for less distortion on thin materials, less spatter minimizes post weld grinding and rework allowing more welding time. Perform welding applications that couldn’t be done in the past.

Auto-Set™ Elite
offers predefined weld settings to increase ease of use and ensure that the job is done right for operators of all skill levels.

Program mode allows easy save and recall of favorite weld settings.
Deliver more productivity, consistent quality by welders of all skill levels by using prequalified weld settings. Minimize supervisor need to intervene.

Capabilities include MIG, pulsed MIG and flux-cored welding.

MDX-250 MIG Gun w/ AccuLock™ S consumables
AccuLock liner loads from the front and locks at the front and back to insure proper alignment for flawless wire feed path. New rubber overmold and ball -and-socket handle design improves grip and reduces welder fatigue. New Industrial Bernard AccuLock™ S contact tips provide superior Spray and Pulsed MIG arc performance.

Portability – Machine only weighs 84 lb.
Weight is reduced by more than 50 percent compared to the Millermatic 252.

Optional EZ-Latch™ running gear
Operators no longer need to use lift truck to load machine and running gear into the truck. Latches secure machine to running gear. Simply loosen the latch retaining knob and rotate latches to disengage machine from running gear for easy portability.

Generator Compatible
The Millermatic 255 will be able to operate and provide full output when powered by generators with 12000 Watt (12K) output or higher. Limited output will occur when used with smaller generators.


  • Shielding gas and safety equipment not included.
  • Shielding gas (for welding with solid wire [GMAW])
  • Welding wire
  • Push-Pull Gun (for welding aluminum)
  • Spool Gun (for welding aluminum)
  • Flux cored drive rolls (for welding with flux cored wire [FCAW])
  • Personal safety products (helmet, gloves)


Flux Cored (FCAW)


Title Millermatic® 255 MIG/Pulsed MIG Welder – 208/240V
Industries Interests Racing
Farm and Ranch
Auto Repair
Welding Education and Training
Amperage 20 A – 350 A
Material Thickness Aluminum 18 ga. (1.2 mm) – 1/2 in. (12.7 mm)
Mild Steel 24 ga. (0.5 mm) – 1/2 in. (12.7 mm)
Weldable Metals Aluminum
Stainless Steel
Input Voltage 208 V
220/230/240 V
Input Phase 1-Phase
Input Hz 50/60 Hz
Input Amperage 31.4
Current Type DC
Rated Output 230 A at 25.5 V, 60% duty cycle
Max Open Circuit Voltage 87 VDC
Wire Feed Speed 1.3 m/min – 20 m/min
50 IPM – 800 IPM
Wire Diameter Aluminum 0.035 in. – 0.047 in.
Aluminum 0.9 mm. – 1.2 mm.
Stainless 0.023 in. – 0.045 in.
Stainless 0.6 mm. – 1.2 mm.
Solid Steel 0.6 mm. – 1.2 mm.
Solid Steel 0.023 in. – 0.045 in.
Flux Cored 0.03 in. – 0.045 in.
Flux Cored 0.8 mm. – 1.2 mm.
Silicon Bronze 0.030 in. – 0.035 in.
Silicon Bronze 0.8 mm – 0.9 mm.
Spool Size 12 in (305 mm)
Portability Handle(s)
Running Gear / Cart (Optional)
Weld Output CV
Applications Aluminum Welding
Mobile Fabrication & MRO
Net Width 13.75 in
Net Height 19.25 in
Net Length 26.25 in
Net Weight 84 lbs
Warranty 3 Years
Miller’s True Blue Warranty

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