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Northern Industrial Welders ST80i Inverter-Based Stick Welder with TIG Option — 115 Volt, 20 – 90 Amp
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Northern Industrial Welders ST80i Inverter-Based Stick Welder with TIG Option — 115 Volt, 20 – 90 Amp

Item# 25494

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Product Summary


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The ST80i inverter-based stick welder with TIG option from Northern Industrial Welders features powerful 115V inverter technology that can be used almost anywhere. The inverter-based system offers increased power output from a smaller transformer, resulting in an extremely lightweight system that weighs about 50% less than comparably powered traditional models. It even includes a shoulder strap for ultimate portability. This versatile welder works as hard as you do, handling mild steel, stainless steel, cast iron and hard surfacing.

What's Included

  • (1) ST80i Inverter Stick/TIG Welder
  • (1) Welding cable with electrode holder
  • (1) Ground cable and clamp
Easy to Use

Easy to Use - Ready for Action

Everything You Need, Right Out of the Box

This handy unit includes the ST80i inverter stick/TIG welder, a welding cable with electrode holder and a ground cable and clamp, so you can unpack it, set it up and start welding right away.

Powered by Standard Household Current

The ST-80i operates off a standard 120V, 20A electrical circuit. No need to re-wire or find a special outlet, this workhorse uses the same electrical circuit that is common in almost every house and garage.

Easy Starting and Smooth Stick Welding

With its built-in hot start arc starting system, this welder helps get the stick electrode started fast. And once it's started, this welder with inverter power source puts out a nice, smooth DC arc. Arc thrust and anti-stick features also chip in to make operation extra easy.

Tough, Capable and Versatile

Welds a Variety of Materials

An arc welder that can only handle one kind of metal can really limit your capabilities. That's why you'll appreciate the versatility of the ST80i — it works as hard as you do, allowing you to weld mild steel, stainless steel, cast iron and hard surfacing.

Handles a Wide Range of Electrodes

The versatile ST-80i works well with a wide variety of stick electrodes in sizes that range from 1/16in. to 3/32in. diameter.

Ready to Tackle the Tough Projects

When it comes to hard work, this welder has some strong capabilities, welding up to 1/8in. steel in a single pass. Need to weld thicker materials? Try using multiple passes to accomplish that tough welding task.

On-the-Spot Infinite Amperage Control

Dial up the exact amperage you need. The adjustable amperage control offers you the flexibility of outputs from 20–75, and 90+ peak to match your project.

TIG-Ready Design

The ST-80i is also a good option for light duty DC TIG welding repair. The optional TIG torch (Item# 20462 – sold separately) is available for lift starts on mild and stainless steel materials. Add the optional TIG torch (Item# 20462 – sold separately) for touch start DC TIG welding on steel and stainless steel. The optional Argon/CO2 regulator/flow gauge (Item# 42664 – sold separately) is also highly recommend for use with TIG welding.

Tough, Capable and Versatile
Safety Matters

Safety Matters

No Overheating

Whether you're welding on a hot day or trying to complete an extensive welding project, the thermal overload protection ensures that your welder will stay safe no matter how hard you run it. A built-in thermostat prevents the unit from overheating, delaying welding power until the unit has sufficiently cooled.

Stays Safely Grounded

To further protect the user against improper usage, the ST80i requires a ground clamp to be properly secured before the unit will operate. If the ground clamp comes loose, the unit safely and immediately shuts down.

Use it Anywhere

Ultra Portable

This welder may be a heavy hitter, but it certainly is not heavy in weight. Advanced inverter technology is used to create more output in a lighter package. The welder itself weighs in at less than 9 lbs.

Performance on the Go

Enjoy the freedom to stick weld on the fly. The included shoulder strap makes this unit easy and comfortable to carry from job to job. A quick-connect electrode and quick-connect ground cable also make this unit quick and easy to set up and take back down.

Detail Work on Your Prized Possessions

If you’re looking to restore that prized old car or take care of your own body work, the excellent ARC characteristics ensure quality welds. And the TIG welding option gives you the chance for even cleaner, more refined welds. So no matter how delicate or how tough the project may be, you’ll be able to weld with confidence.

Use it Anywhere
Limited Warranty

Weld with Confidence

Expert Answers Are Available

Northern Tool + Equipment is here to help you succeed. Our field trained, dedicated team of welding experts is ready to help — call or email and you’ll get a prompt response.

The Northern Industrial Welders Advantage

The Northern Industrial Welders ST80i is built to last and perform. But to give you extra peace of mind, we stand behind our product with a 1-year limited warranty.

Guaranteed Satisfaction

Shop in complete confidence, knowing that Northern Tool + Equipment protects your investment and is ready to provide you with the assistance and helpful resources you need.

High-Quality Replacement Parts — Always Available

Replacement parts are stocked at our Northern Tool + Equipment warehouse and ready to ship.

Features + Benefits

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Features for Northern Industrial Welders ST80i Inverter-Based Stick Welder with TIG Option — 115 Volt, 20 – 90 Amp
  • Increased power in a super lightweight package for exceptional portability
  • The inverter system easily turns fluctuations in input power to consistent output for better welds
  • Requires less input amperage, reducing the overall input power requirement by about 25% when compared to traditional transformer welders
  • Welds with 1/16in., 5/64in. or 3/32in. electrodes
  • Smooth DC inverter arc, hot start and anti-stick features for easy operation
  • Amperage output: 20 - 75, 90+ peak
  • Optional TIG torch (Item# 20462 – sold separately) available for lift start on mild and stainless steel materials
  • Includes shoulder strap for portability

Key Specs

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Item#25494
Ship Weight14.0 lbs
Welding ProcessesStick, TIG
Welding Amperage Range20 - 90 AC
PhaseSingle
Volts115
Amps90
Duty Cycle20% @ 75A
Range SelectionInfinite
Amperage Adjustments20–75
Electrode Size (in.)1/16, 5/64, 3/32
Welds Up To (in.)1/8
Weldable MetalsMild steel, stainless steel, cast iron, hard surfacing
Electrode Cable Length (ft.)10
Clamp Cable Length (ft.)6 1/2
Power Cord (ft.)5
Dimensions L x W x H (in.)12 x 5 x 9

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
1 year Limited Warranty

Protect your purchase beyond the manufacturer's warranty
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Extended Warranty Replacement Plan
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Welding Processes Stick, TIG Stick welding Stick welding Stick welding Stick welding
Welding Amperage Range 20 - 90 AC 65 - 200 AC 30 - 205 AC 40 - 225 AC / 30 - 125 DC 40 - 235 AC / 30 - 150 DC
Phase
Single - Single Single Single
Volts
115 230 230 230 230
Amps
90 65–200 30-205 225 AC / 125 DC 30–235 AC/30–160 DC
Duty Cycle
20% @ 75A 180A at 10% 20% @ 165A, 100% @ 90A 20% @ 225A, 25V 20% @ 225A, 100% @ 100A, 20% @ 150A, 100% @ 60A
Range Selection Infinite Infinite Single 30 - 225 High/Low AC DCEN/DCEP
Amperage Adjustments 20–75 65-200 Accu-Set infinite current control; 1A increments 30 - 225 Accu-Set infinite current control; 1A increments
Electrode Size (in.) 1/16, 5/64, 3/32 1/16–5/32 1/16–5/32 3/16 to 5/32 1/16–5/32
Welds Up To (in.) 1/8 3/8 - - 1/2 in a single pass
Weldable Metals Mild steel, stainless steel, cast iron, hard surfacing Steel, stainless steel, cast iron, hard surfacing Steel, stainless steel, cast iron Carbon, low alloy, stainless steel, cast iron Steel, stainless steel, cast iron
Electrode Cable Length (ft.) 10 10 15 10 15
Clamp Cable Length (ft.) 6 1/2 6 1/2 10 10 10
Power Cord (ft.) 5 8 5 6 5
Dimensions L x W x H (in.)
12 x 5 x 9 16 x 11 x 15 12 3/4 x 17 1/2 x 18 3/4 12 x 17 1/4 x 24 12 3/4 in. x 17 1/2 x 18 3/4