Miller Electric

Limited Availability

Home » Products » Limited Availability » Millermatic® 140 Auto-Set™ MIG Welder

This product is not currently available in all areas, please
check with your local distributor for details.

Millermatic® 140 Auto-Set™ MIG Welder

All-in-one wire welder that welds 24 gauge - 3/16 in. (0.8-4.8mm) mild steel. The simplest Millermatic to set-up and start welding.

Millermatic 140 Auto-Set
  • Millermatic 140 Auto-Set
  • Millermatic 140 Auto-Set Front Panel
  • Millermatic 140 Auto-Set Inside


A breakthrough control that automatically sets your welder to the proper parameters.Auto-Set offers all-in-one MIG minus the guesswork! Simply set the wire diameter, set the material thickness and start welding!

Manual Mode

Gives you the flexibility to manually set the machine when welding aluminum, stainless steel or anytime you want to set your own parameters on mild steel.

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. See how it works.

Standard Built-In Solid-State Contactor Circuit

Makes wire electrically "cold" until trigger is pulled. This makes the unit safer and torch easier to position before starting to weld.


This 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.

Durable Cast Aluminum Drive System

Incorporates dual groove quick-change drive roll and spring-loaded tension arm with calibrated tension knob, all designed to make setup easier and faster.

'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. See how it works.

Easy Access to Output Studs

Provides convenient polarity changeover when switching from solid or flux cored wires.


Stock #

XMT® 350 VS ArcReach™ 907224002

XMT® 450 VS ArcReach™ 907481002

SuitCase® X-TREME™ 8VS ArcReach™ with Bernard® S-Gun™ 951588

SuitCase® X-TREME™ 8VS ArcReach™ with Bernard® Q300 Gun 951584

SuitCase® X-TREME™ 12VS ArcReach™ with Bernard® S-Gun™ 951589

SuitCase® X-TREME™ 12VS ArcReach™ with Bernard® Q300 Gun 951581

Product Literature
Spec Sheet (ENG)
Spec Sheet (SPA)
Spec Sheet (FRE)
ProcessesMIG (GMAW) 
Flux Cored (FCAW) 
Material Type
Max 3/16 in (4.8 mm)
Mild Steel
Min 24 ga (0.8 mm)
Max 14 ga (1.9 mm)
Min 18 ga (1.2 mm)
*Aluminum welding uses optional Spoolmate 100 series spool gun and 4043 Series aluminum wire.
General specificationsInput Power
Requires 1-Phase power
115 V, 20 Amps, 60 Hz
Rated Output
90 Amps at 18 VDC, 20% duty cycle
Welding Amperage Range
30 - 140 Amps
Wire Speed
15 - 390 IPM (1.0 - 12.7 m/min)
Net Weight60lb (27.3kg)
WireDiameter Capacity
.024 - .030 in (0.6 - 0.8 mm) Solid Steel
.024 - .030 in (0.6 - 0.8 mm) Stainless
.030 - .035 in (0.8 - 1.2 mm) Flux Cored
MaxSpoolSize Capacity
8 in (203 mm)
ApplicationsFarm and Ranch 
Field Maintenance and Repair 
Mechanical Contracting 
Metal Art/Sculpture 
Motorsports (car, truck, bike, etc.) 
Welding Projects 
Spool Gun Option SPOOLMATE 100 SERIES See Spool Gun Hook-up Chart

Powerline Financing