Millermatic® 140


All-in-one wire welding package welds 24 gauge - 3/16 in (0.8 - 4.8 mm) mild steel.

General Information: 
  • NEW! Smooth-StartT patent-pending technology provides a smooth, spatter-free start. -The best starting machine in the small MIG category. No more pop-gun starts or spatter to clean up.
  • Infinite voltage control with manual on/off wire feed speed tracking provides broader operating range with finer control by automatically increasing or decreasing wire feed speed when voltage is adjusted. (Unit shipped with wire feed speed tracking set to "off.")
  • Durable cast aluminum feedhead incorporates dual groove quick-change drive roll and spring-loaded tension arm with calibrated tension knob, all designed to make setup easier and faster.
  • Thermal Overload Protection shuts down the unit and activates over- temperature light if airflow is blocked or duty cycle is exceeded. Automatically resets when fault is corrected and unit cools.
  • "Tip Saver" short circuit protection shuts down output when tip is shorted to the work. Extends contact tip life and protects internal components from damage. Trigger reset permits quick reset at torch rather than unit.
  • Standard Built-in solid-state contactor circuit makes wire electrically "cold" until trigger is pulled. Makes unit safer, and is easier to position torch to work before starting to weld.
  • Easy access to output studs provides convenient polarity changeover when switching from solid or flux cored wires.
  • Self-resetting motor protection circuit eliminates the need to find and replace fuses
  • Uses 4 or 8 in (102 or 203 mm) spools and can be set up to weld with wire sizes .024 - .030 in (0.6 - 0.8 mm) mild/stainless steel and .030 - .035 (0.8 - 0.9 mm) flux cored.
Standard Accessories: 
  • 10 ft (3m) M-10 Miller MIG gun
  • 10 ft (3 m) work cable with clamp
  • Factory-installed gas solenoid valve
  • Smith® Argon and AR/CO2 mix regulator/flow gauge and gas hose
  • 6 ft (1.8 m) power cord and plug
  • Two contact tips for .024 in (0.6 mm) wire and two contact tips for .030 in (0.8 mm) wire
  • Spool of Hobart® .024 in (0.6 mm) solid wire
  • Information/settings chart
  • Material thickness gauge


  • Requires 1-Phase Power 115 V, 20 Amps 60Hz
  • Rated Output

  • 90A at 18 VDC, 20% duty cycle
  • Welding Amperage Range

  • 30 - 140 Amps
  • Wire Speed

  • 30 - 140 Amps
  • Net Weight

  • 60lb (27.3kg)