If you've ever searched how far should tungsten stick out TIG, you probably walked away with a dozen different answers. Someone says 1/8 inch. Another welder says 1/4 inch.
Both can be right. It all depends on your cup, your gas lens, and the joint you're welding.
Our research, plus manufacturer charts and American Welding Society guidance, puts the practical range at 1/8 inch to 1/2 inch for most setups. As of 2026, the common starting point hasn't changed: 1/8 to 3/16 inch with a standard cup, with gas lens setups allowing more reach. Let's walk through how to pick the right number for your exact situation.
Quick Answer
For a standard cup, start at 1/8 to 3/16 inch. With a gas lens, push it to 1/4 inch or more. Need more torch access?
Go longer. Watch for arc wander and porosity. Both mean the stickout is too long for your setup.
Why Stickout Actually Matters
Tungsten stickout is the length of electrode that extends past the face of the cup. It's also called electrode extension. It controls how your shielding gas behaves and how clearly you can see the weld pool.
If you're new to TIG welding, this is the variable that separates clean beads from crusty messes.
The cup directs argon or helium around the tungsten and over the puddle. Keep the electrode short, and the gas cone wraps tightly around the molten metal. Push it too far out, and the gas flow turns turbulent.
It pulls in air, and porosity shows up.
Too long also makes the arc wander. The tip ends up outside the focused part of the gas cone, so the arc moves around instead of staying locked on the puddle. That's especially painful on thin steel or aluminum.
Too short is a different headache. You lose sight of the puddle, and the tungsten sits so close that dipping it is almost inevitable. Heat also builds at the cup, which can damage the collet body.
As of 2026, every manufacturer chart we've reviewed keeps standard cups in the 1/8 to 3/16 inch zone for exactly this reason. The American Welding Society's GTAW guidance covers the same ground.
The Variables That Change Your Stickout
Stickout isn't a one-size-fits-all number. It changes as soon as you swap a cup, change processes, or move to a different joint. These are the variables that matter most.
| Variable | What it does | Your response |
|---|---|---|
| Cup size | Smaller cups produce a tighter gas cone | Keep stickout around 1/8 inch |
| Gas lens | Creates a broader, laminar gas flow | Allows stickout up to 1/2 inch |
| Tungsten diameter | Larger tungsten carries higher amperage | Run a bit more stickout with a larger cup |
| Joint access | Tight spots hide the weld puddle | Extend stickout until you can see |
| Base metal and amperage | High heat pulls more shielding gas | Use a larger cup with a longer stickout |
Tungsten tip angle also plays a role. A sharp point concentrates the arc, but a long taper creates a longer arc column. If you run too much stickout with a needle-like point, the arc gets harder to control.
Truncating the point slightly helps stabilize it.
Joint geometry probably matters more than any other single factor. A tight inside corner on a stainless frame often needs a 3/8 inch stickout just to get the torch into the root. On an open flat plate, you can drop back to 1/8 inch and get better coverage.
If you're welding aluminum on AC, the arc naturally wants a larger cup. That's where the upper stickout range comes into play. The best technique for aluminum still starts with the same gas lens decision.
The Decision Tree: How to Pick Your Starting Stickout
The fastest way to set stickout is to work through four questions.
1. Are you using a gas lens?
No? Standard collet body. Start at 1/8 to 3/16 inch.
Don't push past 1/4 inch, or shielding gas coverage falls apart.
Yes? Start at 1/4 inch. Go to 3/8 or 1/2 inch if the joint demands it.
2. Can you see the weld puddle?
If yes, shorter is better. The tungsten sits out of the way, and the gas cone stays tight.
If no, extend until the torch body clears the obstruction. The moment you can see the puddle, stop.
3. What amperage range are you running?
Under 100A, keep it around 1/8 to 3/16 inch. Tiny arcs need a stable, focused tip.
Over 200A, use a larger cup and gas lens. A 1/4 to 3/8 inch stickout is common there.
4. What did the test bead say?
Arc wandering? Shorten by 1/16 inch at a time. Porosity?
Shorten or raise your gas flow. Repeat dipping? Lengthen slightly or adjust your torch angle.
| Condition | Stickout range |
|---|---|
| Standard cup, low amps, flat joint | 1/8 to 3/16 inch |
| Standard cup, tight corner | 1/8 to 1/4 inch |
| Gas lens, flat plate | 1/4 to 3/8 inch |
| Gas lens, tight joint or pipe root | 3/8 to 1/2 inch |
This decision framework is one reason TIG and MIG feel so different. The same torch geometry rules don't apply.
Standard Collet vs Gas Lens Stickout
Standard collet bodies push gas through the cup in a fairly rough flow. The gas cone is short and turbulent. That's why stickout normally stops at 1/8 or 3/16 inch.
Go longer, and the shielding gas disperses before it reaches the puddle.
Gas lenses solve that with a fine stainless steel mesh. The mesh spreads the gas evenly, creating a longer, laminar flow. That one change allows a much longer electrode extension.
| Setup | Typical stickout | Best for |
|---|---|---|
| Standard collet + cup | 1/8 to 3/16 inch | Flat plate, low amperage, basic torches |
| Gas lens + cup | 1/4 to 1/2 inch | Tight joints, pipe roots, high amperage, aluminum |
The cup and collet do more than hold the electrode. They shape the gas flow around the torch itself. With a standard setup, a 1/4 inch stickout on a small cup can literally suck air into the weld.
A gas lens avoids that.
If you find yourself reaching for a longer stickout, install a gas lens instead of just running your standard cup longer. That's the cleaner fix. Manufacturer diagrams, like the ones in Miller Electric's TIG resources, show how the gas starts spreading before it leaves the cup.
This also matters when you're deciding which process suits your shop. TIG's torch access is one of its best features, and the gas lens is what makes long stickout practical.
