PowerMTS 251SI

250 amp MIG / TIG / Stick welder
Special Price $1,604.55 Regular Price $1,689.00
In stock
The compact PowerMTS 251Si is one of the fourth generation of digitally controlled multi-process inverter welders from Everlast. Taking our customer's feedback into consideration from previous models, the all new PowerMTS 251SI is designed to be as versatile as ever with not only standard DC MIG, TIG and Stick welding capability but also with Synergic MIG, Pulse MIG, and Pulse TIG welding modes. This new welder is a leader in the compact multi-process welder class as both pulse MIG and pulse TIG features are not available from any other manufacturer. Additionally, the PowerMTS 251Si offers one more distinctive feature: it allows to the operator to choose from a touchless, high frequency start or a lift start in TIG mode. The stick mode offers more adjustability than ever with the addition of hot start intensity and hot start duration controls. If you are worried that these features may complicate the operation of the welder, then don't. The unit was designed with ease of operation in mind. There are no complicated menus to navigate, no touch screens to press and no complicated hidden features which are difficult to access. All controls, including burn back are now located on the panel face right where you can get to them and are grouped according to function, with an easy to understand format. All connections are right on the front of the panel. This includes the connection for the TIG torch which includes the gas connection with a gas solenoid control over pre and post flow. Compare that to the competition where you have to make the TIG connection through the side panels or through special non-standard connections with only a manually operated gas valve on the torch for scratch start or lift start, and you can see how far ahead the PowerMTS 251Si really is. Well, it makes sense when you consider Everlast was one of the first to offer a compact fully featured inverter MTS unit in the North American market. As you've come to expect from Everlast, the PowerMTS 251Si arrives almost ready to weld. It comes with not only the MIG and Stick torch, cables, and regulator it also comes with the TIG package which includes a torch, foot pedal and starter kit of consumables (tungsten not included)...something that costs extra in units offered from the competition. You'll only need to supply the shielding gas, tungsten, and the welding wire/filler metal/welding rods to be up and running.
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You're reviewing:PowerMTS 251SI
New! DC Pulse TIG and Single pulse MIG capability.
New and exclusive! High Frequency and Lift Start TIG mode for added versatility.
Digitally controlled operation in all modes improve control and dependability.
New! Operator friendly panel without complicated hidden menus or adjustments with grouped controls.
Synergic function MIG automatically adjusts wire speed while voltage is increased or decreased. This maintains a preset ratio of volts and amps that can be tweaked manually by user for best operation.
Manual Override of Synergic MIG function allows the user to regain control of at any point to fine tune automatic voltage settings and allows operation in full manual mode if desired.
Weld Aluminum, Stainless, or Steel with Synergic MIG function with wire diameter from .023- .045" (for full range of sizes and flux core use, purchase optional drive rolls).
Exclusive! 9 channel memory function provides easy saving and recall of your favorite settings.
Synergic Spool gun operation capability with optional spool gun. Ideal for welding aluminum.
TIG torch and Foot pedal included for TIG. Regulator included.
Built in gas solenoid and connections for TIG eliminates need for gas valve torch used by competitors
True DC CC/CV Multi-Process design eliminates needing or carrying multiple units for one job.
Compact and light weight design makes the unit extremely portable, ideal for on-site fabrication.
Adjustable Burn-back control keeps the wire energized after wire has stopped feeding to allow the wire to melt back to a desired length without retrimming wire before restarts.
12" and 8" capable (with adapter for 8" rolls) Diameter wire spool capacity maintains portability while maintaining productivity.
Adjustable MIG Wave arc force control manages slope/ inductance and fine tunes arc characteristics.
Adjustable stick Arc Force and New Hot Start controls allows the user to dial in desired Stick welding performance.
TIG Up and Down slope allows the user to control the end of the welding cycle.
2T/4T torch trigger/latch function offers stepped control welding with TIG and MIG.
Adjustable Pre and Post flow for TIG and MIG operation improves over all weld quality.
250 Amps of MIG and TIG power offer more than enough power to get the job done. 200 amps of stick welding power can be used with up to 5/32" welding rods.
Dual Voltage design will operate on 120V or 240V. Output on 120V is limited to 150 amps MIG/TIG/ 125 amps Stick.
12 ft. Everlast 26 Series TIG torch with series 35 DINSE-style connector
10 ft. Series 24 MIG torch with Euro style quick connect fitting
Stick electrode holder with 10 ft. cable and 35 series DINSE-style connector
Work clamp with cable 10 ft. cable and 35 series DINSE-style connector
Spare consumable starter kit (does not include tungsten)
Foot Pedal
Argon Regulator
Digital/Micro-controlled IGBT Inverter
Output /Process Type:
Max Rated MIG Amps:
120V @ 150A
240V @ 250A
Max Rated TIG Amps:
120V @ 150A
240V @ 250A
Max Rated Stick Amps:
120V @ 150A
240V @ 240A
MIG Amps/Volts @ Rated Duty Cycle:
150A/21.5V @ 40% Duty Cycle/40º C
250A/26.5V @ 40% Duty Cycle/40º C

TIG Output Amps/Volts @ Rated Duty Cycle:

150A/16V @ 40% Duty Cycle/40º C
250A/20V@ 40% Duty Cycle/40ºC

Stick Amps/Volts @ Rated Duty Cycle:
120A/24.8V @ 40% Duty Cycle/ 40º C
200A/28V @ 40% Duty Cycle/ 40º C

Max Inrush ( I1MAX ) Amps:
@120V: 36A
@240V: 37A

Maximum Rated (I1EFF ) Input Amps:
@120V: 22.8A
@240V: 23.2A
MIG: 60V
TIG: 60V
Stick: 60V
MIG Output Range:
120V: 30-125A/15.5V-20.3V
240V: 30A-250A/15.5V-26.5V

DC Lift TIG Output Range :
(High Frequency or Lift Start operation)
Stick Output Range:

Variable MIG Inductance/Stick Arc Force Control:
Spool Gun Capable:
Pulse Frequency:
MIG: 20-200Hz
TIG .5-250Hz
Pulse Time On:
TIG: 5-95%
Pulse Volts:
10-90% of MIG Volts
5-95% of TIG Amps
Standard Drive Roll wire size:
Separate wire feeder:
No, self contained
Number of Drive rollers:
Max Wire Feed Speed:
600 IPM
Max Wire Roll Diameter:
8” (up to 12 lb)
Upslope Time:
0- 5 Seconds
Down Slope Time:
0-5 Seconds
Preflow time:
0-5 Seconds
Post Flow Time:
0-10 Seconds
Foot Pedal:
Flux Core:
Yes, Optional
Air Carbon Arc:
2T/4T /Torch latch/Trigger:
Other Features:
High Frequency Start and Lift TIG start in TIG Mode
Pulse TIG
Pulse MIG
Stick Arc force Control
Stick Hot Start Duration Control
Stick Hot Start Intensity Control
Minimum Generator Wattage needed for maximum output on 240V: 8500 W

Minimum Generator Wattage needed for maximum output on 120V: 4500 W

NOTE: Use only with a generator rated by its manufacturer as "clean power" if using with a generator. Consult manufacturer of generator for certification. Everlast does not approve or endorse generator brands or models, however, if the damage to the welder occuring from use with a generator not labeled as producing clean power by its manufacturer is not warrantable. Typically clean power is represented as less than 5% THD.

Appearance and type of accessories and consumables may vary from what is depicted.

Weld up to a maximum of 1/2" single pass* (240v)
Weld up to a maximum of 3/4" multi-pass (240V)
Weld a minimum of 24 gauge (120/240V)
Weld a maximum of 3/16" single pass (120V)
Weld a maximum of 3/8" multi-pass (120V)
* Single pass welds greater than 1/4" are not recommended as a sound welding technique.


Weld up to a maximum of 1/2" single pass (240V)
Weld up to a maximum of 3/4" multi-pass (240V)
Weld a minimum of .015" thick (120/240V)
Weld up to a maximum of 3/16" single pass (120V)
Weld up to a maximum of 3/8" multi-pass (120V)

Weld with a maximum of 3/16" diameter electrode (240V)
Weld with a minimum of 1/16" diameter electrode (120V)
Weld with a maximum of 1/8" electrode (120V)
Maximum electrode thickness is ultimately dependent upon electrode type and electrode manufacturer