TIG Welders

Special 40th Anniversary Edition Invertig 221 AC/DC Single Voltage (220V) Water-Cooled

Product # 601042


20 Series Water-Cooled TIG Torch, Amperage Control of Your Choice, Ground Clamp, Flowmeter, 6' Gas Hose, 2-Gallons of Coolant

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

On January 1st, 2021, we will be increasing the price of the water-cooled Invertig 221 AC/DC by $100.00; the new price of the water-cooled Invertig 221 AC/DC will be $3,270.00, without upgrades. Place an order now and beat the price increase!

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 90-Day Money Back Guarantee. We are so sure you will love your Invertig 221 that you can try it in your own shop for 90 days. If for any reason you don't like it, we will take it back no questions asked. Further, we back the Invertig 221 with a 3-year warranty.

When you purchase a water-cooled single voltage Invertig 221, your shipment includes the single voltage (220V) Invertig 221 power source, the single voltage (220V) Arctic Chill water-cooler, a 20 Series water-cooled TIG welding torch (either 12.5' or 25' and with either a rigid, flex, or swivel head), a foot pedal, hand control, or both (either 12.5' or 25'), a 10' or 25' ground cable and clamp assembly, a 6' gas hose, a flowmeter, and 2-gallons of coolant.

Input Voltage 220V (208-240V)
Welding Current 4 to 220 Amps
Single Phase Rated Output 20% @ 220 Amps
230V Single Phase Input Amps @ Rated Load 36 Amps
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% @ 220 Amps
60% @ 165 Amps
100% @ 145 Amps
Duty-Cycle Stick 25% @ 200 Amps
60% @ 155 Amps
100% @ 140 Amps
Dimensions 19-3/4" L x 7-1/2" W x 15-3/4" H
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
5.0 Based on 4 Reviews
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Robert L.
United States United States
Welding at the next level!

I replaced my old GIANT Airco transformer Heliarc with the single voltage Invertig 221 package including the water cooler and accessories, I have had it now for the whole summer with not a single problem yet! Puts a smile on my face every time I turn the power switch on! Easy beautiful welds in aluminum and stainless alike. I can move this unit by hand not like my old one that needed a forklift to move. Never knew Tig could be so much easier! THANK YOU USA WELD!

Brett b.
United States United States
amazing machine

I have had the big names in welders and this welder has some of the best features for the least amount of money great buy love this machine

Mark H.
United States United States
0 problems

Excellent welder. This is our primary tig welder and it has never let us down. The customer service is fantastic (you actually speak with a person).

Stephen R.
United States United States
Overall HtlTP 221

Awesome. I go from 1 inch aluminum AC 200 amps... to rotted steel riding tractor mower decks 80 amps . Flawless. Have taken the whole shooting match on the road and repaired chrome moly Dragster chassis here and there. Very versatile machine. Highly recommend!!! These are from this morning. 1" Aluminum Big Block Ford dry sump mount that needed the boltholes dropped 3/4"

HTP America - USA Weld Invertig 221 AC/DC Single Voltage (220V) Water-Cooled ReviewHTP America - USA Weld Invertig 221 AC/DC Single Voltage (220V) Water-Cooled Review