Millermatic® 255 MIG & Pulsed MIG Welder 208 - 240 V | MillerWelds

Millermatic® 255 MIG/Pulsed MIG Welder - 208/240V

907734
MIG, Pulsed MIG and flux cored 208/240 V welder that welds from 24 gauge – ½ in. mild steel.
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Machine Only
907734

Single Cylinder Running Gear Package
951766

Spec Sheet (English)
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Features

What's Included

  • 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.
Auto-Line™ Technology
For portability and reliability this inverter power supply allows for any single-phase input voltage hookup (208–240 V) with no manual linking, providing convenience in any job setting. Ideal solution for dirty or unreliable power.
Versatility
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.

Not Included

  • 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)

Specifications

Processes

Aluminum Welding
Flux Cored (FCAW)
MIG (GMAW)

General Specifications

Title Millermatic® 255 MIG/Pulsed MIG Welder - 208/240V
Industries Interests Auto Repair
Boat / Yacht
Commercial Truck and Trailer
Education / Training
Fabrication
Farm and Ranch
Maintenance and Repair - Field Operations
Maintenance and Repair - In Plant
Manufacturing
Metal Art
Racing / Customizing / Restoring
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
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
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

Accessories

EZ-LATCH SINGLE CYLINDER RUNNING GEAR for Millermatic® 255/355 and Multimatic® 235/255

EZ-Latch™ design, latches machine to running gear to easily move machine and gas cylinder around work cell or simply rotate latches to disengage machine from running gear for easy portability. Eliminates the need to use lift-truck to load machine into a vehicle to get to remote site.
Package;EZ-Latch™ Dual Cylinder Running Gear With CBL Holder

Running gear with a dual cylinder rack and storage compartment. Latches secure machine to cart. Simply rotate latches to disengage machine from cart for easy portability. Dual cylinder rack which allows operator to easily store two gas cylinders. Includes elevated gun and cable rack to keep cables off the floor and tangle free.
EZ-Latch™ Dual Cylinder Rack with Elevated Gun and Cable Rack

Converts an EZ-Latch single cylinder running gear into a dual cylinder rack to easily store two gas cylinders. Gun and cable rack keeps cables off the floor and tangle free.
MDX™-250 MIG Welding Gun, 10ft, .035-.045 wire, AccuLock™ S Consumables

250A rated output. Next-level advancements include a comfortable new handle with rubber overmolding and rear swivel, optimized wire-feed path for reliable performance, and simplified maintenance.

Consumables

AccuLock™ S Contact Tip for 0.023" (0.6mm) Wire (Bernard bag, 10 per pkg) $17.40

For use with MDX-250 MIG Guns and Bernard BTB MIG Guns. Pair with AccuLock S Diffuser, Nozzles and AccuLock Liners and Power Pin Caps.
AccuLock™ S Contact Tip for 0.030" (0.8mm) Wire (Bernard bag, 10 per pkg) $17.40

For use with MDX-250 MIG Guns and Bernard BTB MIG Guns. Pair with AccuLock S Diffuser, Nozzles and AccuLock Liners and Power Pin Caps.
AccuLock™ S Contact Tip for 0.035" (0.9mm) Wire (Bernard bag, 10 per pkg) $17.40

For use with MDX-250 MIG Guns and Bernard BTB MIG Guns. Pair with AccuLock S Diffuser, Nozzles and AccuLock Liners and Power Pin Caps.
AccuLock™ S Contact Tip for 0.039" (1.0mm) Wire (Bernard bag, 10 per pkg) $17.40

For use with MDX-250 MIG Guns and Bernard BTB MIG Guns. Pair with AccuLock S Diffuser, Nozzles and AccuLock Liners and Power Pin Caps.

Resources

Literature

MDX MIG Gun Consumables & Machines Compatibility Chart

Videos

How to Change Nozzle, Tip, Diffuser, and Liner with Set Screw for MDX™ MIG Guns
Follow some simple step-by-step instructions to change AccuLock™ consumables on MDX™ MIG guns and gain an optimal wire...
How to Reinstall a Trimmed Liner for MDX™ MIG Guns with Set Screw Power Pin Cap
When the power pin cap is removed from a MDX™ MIG gun, the liner can retract and appear too short to lock into place....
Powerful and Accessible Millermatic 255 MIG Welder
“It’s making you a better welder without you even knowing it,” says Josh Welton about the Millermatic 255 MIG welder. See...

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Question & Answers