Everlast PowerMTS 251Si Multi-Process Welder

If you’re the type of person who’s constantly going back and forth between projects and need the ability to weld using different processes, the Everlast PowerMTS 251Si multi-process welder has you covered.

Capable of not only DC MIG, TIG and stick welding, the PowerMTS features synergic MIG mode as well as pulse MIG/TIG, making it the most versatile welder available today. Utilizing an inverter design, the Everlast PowerMTS 251Si is not only powerful, outputting 250 amps, but also surprisingly portable weighing around 80 lbs.

While the Everlast PowerMTS 251Si multi-process welder may not be for everyone, if you’re limited on space or don’t want the hassle of owning and maintaining three separate machines, it could be just what you’re looking for.



  • MIG/TIG/Stick capable
  • DC Pulse TIG, Single Pulse MIG and Synergic MIG modes
  • HF and Lift start for TIG
  • Inverter design
  • User friendly controls
  • 9 channel memory
  • Extremely portable
  • Dual voltage – 120V/240V
  • 12″ and 8″ spool ready
  • Quiet


  • Expensive
  • No plasma cutting

What’s Good?

MIG/TIG/Stick capable

The main reason for considering the Everlast PowerMTS 251si is because of its tremendous ability. In a single compact, lightweight package you get a powerful MIG, TIG and stick welder to satisfy all your metal fabrication needs.

MIG – Capable of outputting 250 amps, the MIG process on this machine is a powerhouse that can weld up to 5/16-inch mild steel. Featuring pulse and synergic MIG options, you can fine tune your setup to your exact specifications for a perfect weld every time.

TIG – With the gun, foot pedal and regulator already included, all you need is gas and you’ll be ready to TIG. This gives you the ability to weld aluminum and ultra-thin metal not suitable for MIG or stick. In addition, the Everlast PowerMTS 251si has the option for high frequency start or lift start for added versatility.

Stick – While it can only output 200 amps of power for stick, it’s still a powerful machine, capable of welding up to 5/32-inch electrodes. Furthermore, the stick mode offers more adjustability than ever with the introduction of hot start intensity and hot start duration controls.

Everlast PowerMTS 251Si

Pulse TIG, Pulse MIG and Synergic MIG modes

Talk about versatility. In addition to being able to weld MIG, TIG and stick the Everlast PowerMTS 251si also has three distinct modes for the MIG and TIG process:

Pulsed TIG – TIG welding with the pulse feature is ideal for welding wafer-thin metals such as aluminum. There are several instances where you would use pulsed TIG including:

Better heat control

Good looking welds

Minimal movement

More speed control

Edge welding

Pulsed MIG – Simply put, pulsed MIG is a non-contact welding process that works by forming a single droplet of molten metal per pulse. Then the current is added to push the droplet across the arc into the puddle. Pulsed MIG is used for:

Cost savings

Spatter and fume reduction

Heat reduction

Increased productivity

Better quality

Synergic MIG – This is the most common type of MIG, the type you probably learned on. Syneric just refers to a machine that, when a single setting is changed, all the other settings change in ‘synergy’ with the one adjustment.

For example: If you only know one parameter, wire thickness, you can input that dimension and all the others (material thickness, speed, etc.) adjust accordingly.

This requires you to know some basic information about what you are welding. But you should know that already.

Everlast PowerMTS 251Si

HF and Lift start for TIG

The TIG function on the Everlast PowerMTS 251Si offers two distinct starting methods: high frequency and lift. Each one has its benefits and drawbacks depending on the work that needs to be done.

High Frequency – Is the most common and best overall option for TIG, especially when welding aluminium. This method works by generating a high-frequency arc between the tungsten and the work piece. This ionizes the air and bridges the gap without having to touch tungsten to metal. Simply put the tungsten near the work, press the pedal and you’re good to go.

The only downside is that you have to be wary of electronics. High-frequency starting will wreak havoc on electronic devices, so make sure your phone is tucked away somewhere else.

Lift Start – Is an option if you can’t, for whatever reason, use HF. It involves dropping the tungsten down to the metal and then quickly bringing it up to draw the arc. Lift start is only used when HF is not an option and is not suitable for aluminum.

Inverter design

The Everlast PowerMTS 251Si is an inverter based welder. Which means that instead of this 3-in-1 welder weighing 900 lbs it weighs a mere 80 lbs – making it the most portable multi-process welder on the market.

In addition to the increased portability, an inverter welder will also save you a ton of money on energy costs and can arguably produce better welds.

Extremely portable

Thanks to its inverter design the Everlast PowerMTS 251Si is a dream if you need to haul your rig around the job site. Weighing less than 80 lbs and measuring around 2-feet in length this unit can be easily carried around by a single person. There is even a hefty handle on  top for added portability.

User friendly controls

You may be looking at the control panel thinking, “that looks complicated.” But it’s actually quite easy to navigate.

This machine was built with ease of use in mind. There are no complex menus to look through, no touch screens to grease up and no complicated features built into the side of the rig. Everything you need is clearly labeled and marked on the front, in a easy-to-read control panel. The buttons are big enough to press with gloves on and the LED indicators can be seen even with a welding helmet so you’ll always know your exact specs before striking an arc.

Everlast PowerMTS 251Si

9 channel memory

One of my favorite features on the Everlast PowerMTS 251Si is the 9-channel memory. This allows you to have up to 9 pre-stored settings for various jobs which makes switching a breeze.

For example if you find yourself both MIG welding 1/8″ mild steel and TIG welding 1/16″ aluminum on a regular basis you can preset the settings for each application and switch between the two with the touch of a button. This can save you a lot of prep time and money in the long run.

Dual voltage – 120V/240V

The Everlast PowerMTS 251Si is capable of running on a standard household 120V outlet for all of your home repair needs. However, there is a limit to the amount of power it can output – 150 amps for MIG/TIG and 125 amps for stick.

That’s where the dual voltage option comes in handy. Using the 240V outlet provides maximum power to the rig, capable of producing 250 amps for MIG/TIG and 200 amps for stick. With such power, there’s not much the Everlast PowerMTS 251Si can’t do.

12″ and 8″ spool ready

As if this rig isn’t adaptable enough, it’s ready to be equipped with either 12″ or 8″ spools of wire. No matter the situation the Everlast PowerMTS 251Si is ready and capable.

Everlast PowerMTS 251Si


Noise level is often overlooked when considering a new welder. A lot of people wear hearing protection anyway so it’s usually not an issue. However, in case you are worried about noise, the Everlast PowerMTS 251Si has very little of it. The inverter design and specifically channeled airflow make sure this welder runs quiet as a mouse.

What’s Bad?


You didn’t think you were going to get a high-quality 3-in-1 welder without paying the price did you? Depending on where you go, this rig will run you upwards of $1500.

As of Summer 2017, Amazon has the best price and free shipping.

No plasma cutting

There are two unique classes of multi-process welders: TIG/Stick/Plasma (TSP) and MIG/TIG/Stick (MTS). This welder is an MTS unit, meaning it has no plasma cutting ability. It’s not really a con but you should be aware of the difference.

Not a ‘big 3 brand’

While it’s not a Lincoln, Miller or Hobart, Everlast is quickly joining the ranks of the best welding products available.

The Verdict – Everlast PowerMTS 251Si

Everlast may not be considered a ‘top brand’ but after reviewing the PowerMTS 251Si there’s no reason why they shouldn’t be.

Complete with MIG, TIG and stick capabilities this unit puts out a whopping 250 amps of power for MIG/TIG and 200 amps for stick. It uses both 120v and 240v power making it the ideal machine for at home and in the shop. In addition, almost everything you need to get started today is included in the box. Just supply the gas and the wire and you’re all set.

If you’re looking for one machine to rule them all and have the budget to match, the Everlast PowerMTS 251Si is the ideal choice.

Specs and Features


Weight: 80 lbs

Size: L25″ x W16″ x H19″

Power Input: 110V/220V

Power Output: 250A

Duty Cycle: 35% @ 250A

Material Thickness: Up to 3/8″

Warranty: 5 year