TIG Welders

Invertig 221 AC/DC Single Voltage (220V) Water-Cooled

Product # 601042

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Arctic Chill Water-Cooler (220V), 12.5' 20 Series Water-Cooled TIG Torch, 12.5' Foot Pedal, 10' Ground Clamp, Flowmeter, 6' Gas Hose, 2-Gallons of Coolant, Complimentary EDGE Welding Consumable Kit

Does Not Include:
Welding Cart, Gas Bottle, Tungsten, Filler Rod

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The Invertig 221 AC/DC Inverter TIG Welder allows you to produce welds with all types of metals! We increased the maximum welding current by 10% to a full 220 amps of rugged welding power. We also put the machine on a diet—the Invertig 221 weighs in at only 54 lbs. so it's easy to take right to the job! 

We packed the Invertig 221 with features many of our competitors don't even offer at twice the price! The Invertig 221 is the only welder in its class with independent AC amperage adjustment, which gives you precise control over the heat input to both the work piece and the tungsten by allowing you to separately adjust the electrode negative and the electrode positive amperage.

Conventional transformer TIG welders have a fixed AC frequency of 60 Hz (the same as your household current) and use a pure tungsten electrode which forms a ball when welding AC. The Invertig 221 offers you the ability to adjust the AC frequency from 20 Hz to 200 Hz—the higher AC frequency gives you a more focused arc with greater arc control. With an inverter, running a higher AC frequency, say in the 150 Hz to 200 Hz range, allows you to use Ceriated, Lanthanated, or Thoriated tungsten sharpened to a point, which:

1. Allows the arc to jump from a point instead of a ball, which provides unparalleled arc stability and reduces arc wandering.
2. Produces a more focused arc, which results in a narrower bead and makes it much easier to weld inside corners.
3. Minimizes the heat affected zone as the heat is more concentrated, which makes it easier for both the novice and professional to weld thin materials.

The Invertig 221 also gives you precise control over the AC balance (from 10 to 90%) so you can control the arc cleaning action.

Furthermore, the Invertig 221 makes an excellent DC welder. The smooth, stable arc coupled with the 221's high speed DC pulse makes intricate work on mild steel, stainless steel, Inconel, and titanium a breeze. High speed DC pulse focuses the DC arc much like the AC balance focuses the AC arc and results in more control and less arc wandering. With a pulse rate of up to 999 PPS, there isn't a job out there that the 221 can't handle.

Control of the arc is the foundation of better welds and precise results. With independent AC amperage adjustment, adjustable AC frequency, adjustable AC balance, and high speed DC pulse, the Invertig 221 gives you arc control like you never experienced before.

The Invertig 221 allows you to store up to 64 separate welding programs. Say you find a setting you really like for welding aluminum radiator tanks to cores—AC On, HF On, Max Current @ 180 amps, AC balance @ 65%, AC frequency @ 180 Hz, EP @ 60%, Pulse Frequency @ 1 Hz, Peak Time @ 80%, and Background Current @ 30%. Simply store the program and recall the program when you have another tank to core job. Assigning banks of memory slots to multiple welders allows the welders to access their personal settings in a job shop environment.

Conventional arc welding is simple with the Invertig 221. Using the Stick Mode in conjunction with the foot pedal allows you to vary the welding amperage. Perfect when doing pipe welding!

Select the touch start mode for welding aluminum or any other material without High Frequency. This is important if your application takes you near sensitive electronic equipment, such as on site repairs in a hospital or when repairing aluminum vehicles with on-board computers.

The advanced technology found in the Invertig 221 allows you to produce professional quality welds—quickly, easily, and affordable—with all types of metal. Every Invertig 221 comes with our 30-Day Money Back Guarantee. We are so sure you will love your Invertig 221 that you can try it in your own shop for 30 days. If for any reason you don't like it, we will take it back no questions asked. Further, we back he Invertig 221 with a 3-year warranty.

Plastic water tank eliminates coolant contamination due to electrolysis or chemical reactions. All units are plumbed with copper tubing and reinforced hose. New extended life pump features a direct drive power system reducing maintenance and vibration. No external plumbing is required because of closed loop water system. Self priming pump. Easy change pump Strong rigid construction designed to support power unit. Compact design. The dimensions of this water cooler are 12" L x 14W x 9H and it weighs 40 lbs dry. 

The standard Invertig 221 AC/DC single voltage (220V) water-cooled package includes the following items:

♦ Invertig 221 AC/DC Single Voltage (220V) Power Source
♦ 220V Arctic Chill Water-Cooler
♦ 12.5' 20 Series Rigid Neck Water-Cooled TIG Torch*
♦ 12.5' Foot Pedal*
♦ Flowmeter
♦ Gas Hose
♦ 2-Gallons of Coolant
♦ EDGE Consumable sample kit if in stock
♦ 10' Ground Cable and Clamp Assembly*

*Upgrade options available, via drop down boxes above, for additional charges.

Input Voltage 220V (208 to 240V)
Welding Current Single-Phase 4 to 220A
Single-Phase Rated Output 20% @ 220A
230V Single-Phase Input Amps @ Rated Load 36A
Welding Modes Stick
TIG Spot
TIG Reset
Programmable Memories 64
Asymmetric Arc Yes
AC Frequency (Hz) 20 to 200
AC Balance (%) 10 to 90
Pre-Flow (Seconds) 0.1 to 2.0
Post-Flow (Seconds) 0.1 to 30.0
Initial Amps (%) 10 to 90
Final Amps (%) 10 to 90
Slope Up (Seconds) 0.1 to 2.0
Slope Down (Seconds) 0.1 to 2.0
Spot Time (Seconds) 0.1 to 10.0
Wave Forms Square
EN Amperage (%) 10 to 90
EP Amperage (%) 10 to 90
Duty-Cycle (TIG) 20% @ 220A
60% @ 165A
100% @ 145A
Duty-Cycle (Stick) 25% @ 200A
60% @ 155A
100% @ 140A
Dimensions (Length x Width x Height) 19-3/4" x 7-1/2" x 15-3/4"
Weight 40 Lbs.
Pulse Parameters
Pulses/Second (PPS) Stick AC & DC
Pulses/Second (PPS) TIG AC
Pulses/Second (PPS) TIG DC
Peak Time (%)
Background Amps (%)

0.4 to 5.0
0.4 to 10.0
0.4 to 999
10 to 90
10 to 90

CA Prop 65 - For Residents of California
Warning: Welding and cutting equipment, accessories, and fumes can expose you to chemicals, including Chromium (Hexavalent Compounds), Lead, and Nickel, which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.
Customer Reviews
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Filter Reviews:
Leonard B.
United States United States

New 221.

The machine works great. That's why I bought a second one to put him in the shop and on my other truck. Thanks for your great service.

Scott V.
United States United States

Nice Welding Rig

This machine replaced my old reliable Lincoln square wave 350. i just finished a 10 point roll cage with my new invertig 221 and it does everything well. took a little bit to figure it out setting it up, called the service line on a saturday afternoon and someone promptly called me back,, great service.

Jason C.
United States United States

It's a great machine.

Great machine. Everyone who uses it who actually knows what they are doing loves it.

United States United States

Portable and Powerful

I have been with the largest petroleum transport company in Illinois (aluminum tankers) for close to 40 years. Always purchased Blue and Red with reliable results. After some research I decided to purchase the HTP Invertig 221ac/dc (water cooled) for personal use. I was pleased with the simplicity once I understood all it's functions. With good prep, for me 1/4" + aluminum is a cake walk and steel is exceptionally smooth as well. I just ordered the new Invertig 301 ac/dc for the shop to give us a bit more punch. The choice of three wave forms and the pulse stick fetcher sold me. Thanks to all at USA weld!

Matt M.
United States United States

This is the second one I’ve bought. They are awesome machines.

The welder is awesome I wish I didnt mess up and got the 25 ft leads I wanted