Stick out in welding is the length of wire or electrode extending beyond the contact tip of your welding gun before it reaches the arc. In MIG and flux-core welding, this distance typically ranges from 3/8 inch to 3/4 inch for solid wire, though some flux-core electrodes call for as much as 3.5 inches. It might seem like a minor detail, but even a 1/8-inch change in stick out can shift your amperage enough to affect penetration, spatter, and overall weld quality.
How Stick Out Works Electrically
When welding current leaves the copper contact tip and enters the wire electrode, it encounters significantly more electrical resistance. The longer the wire extends past that contact tip, the more resistance builds up along its length. This is a straightforward application of Ohm’s law: more resistance in the circuit means the wire heats up more before it ever reaches the weld puddle.
On a constant voltage (CV) power source, which is what most MIG and flux-core welders use, the machine holds voltage steady and lets amperage fluctuate. So when you increase your stick out without changing wire feed speed, amperage drops. When you shorten your stick out, amperage climbs. This relationship is surprisingly sensitive. With a .072-inch flux-core wire at moderate settings, moving from minimum to maximum stick out can swing amperage by roughly 50 amps. That’s a massive change from what looks like a small adjustment at the gun.
The arc length itself stays relatively constant on a CV machine because the power source compensates automatically. What changes is how much energy reaches the workpiece. Lower amperage from excessive stick out means less penetration into the base metal, while a stick out that’s too short can drive amperage high enough to burn through thin material or create excessive spatter.
Recommended Stick Out by Process
MIG Welding (GMAW)
For solid MIG wire, stick out ranges are fairly tight. Small diameter wires like 0.030-inch typically call for 3/8 to 1/2 inch of stick out. Larger wires around 1/16 inch perform best at 5/8 to 3/4 inch. The goal is keeping enough wire exposed to maintain a stable arc without losing so much amperage that you sacrifice fusion into the joint.
Gas-Shielded Flux Core (FCAW-G)
Flux-core wires used with external shielding gas work within a narrow stick out window, usually 1/2 to 1-1/4 inches. Going beyond 1-1/4 inches risks shielding gas coverage problems at the weld puddle, which can introduce porosity (tiny gas pockets trapped in the weld).
Self-Shielded Flux Core (FCAW-S)
Self-shielded flux-core electrodes are the outlier. Their recommended stick out ranges from 3/4 inch to as long as 3.5 inches, depending on the specific wire. This isn’t just a tolerance. It’s a design feature. The flux inside these wires needs to be preheated before it combusts in the arc, and the electrical resistance heating that occurs along a longer stick out accomplishes exactly that. This stick out difference is actually the biggest operational distinction between gas-shielded and self-shielded flux-core electrodes.
TIG Welding (GTAW)
TIG welding uses a non-consumable tungsten electrode, so “stick out” here refers to how far the tungsten extends past the ceramic cup or nozzle. The general guideline is three times the tungsten’s diameter, with a maximum of six times the diameter in draft-free environments. A gas lens, which creates a more uniform and extended shielding gas flow, allows you to safely push the tungsten out farther for better visibility and access in tight joints. Without a gas lens, excessive tungsten extension starves the weld of shielding gas coverage.
What Happens When Stick Out Is Too Long
The most immediate consequence is a drop in welding current. Since less energy reaches the base metal, you get shallower penetration and a weld that may sit on top of the joint rather than fusing deeply into it. This can look acceptable on the surface while hiding a lack-of-fusion defect underneath.
Excessive stick out also moves the weld puddle farther from the gas nozzle, which weakens shielding gas coverage. Atmospheric contamination causes porosity, visible as small holes on the weld surface or, worse, hidden inside the bead. To compensate for the greater voltage drop across a longer electrode, welders often increase the machine’s voltage setting, but this only partially offsets the problem and can introduce its own instability.
The wire itself becomes harder to control at longer extensions. It can wobble or wander, especially with thinner diameters, making it difficult to place the arc precisely where you need it.
What Happens When Stick Out Is Too Short
A stick out that’s too short drives amperage up, sometimes dramatically. The extra current increases heat input into the weld, which can cause burn-through on thinner materials and create a wider, flatter bead profile than intended. Higher current also tends to produce more spatter, sending molten metal droplets onto the surrounding base material and inside the nozzle.
Holding the gun too close to the work also puts the contact tip and nozzle in the direct path of radiant heat and spatter buildup. Over time, this accelerates wear on consumables and can cause the wire to feed erratically as spatter accumulates inside the tip. In MIG welding, spatter buildup inside the nozzle can restrict gas flow and create the same porosity issues you’d see from excessive stick out.
Keeping Stick Out Consistent
Consistency matters more than hitting a perfect number. A welder who holds 1/2-inch stick out throughout an entire pass will produce a more uniform bead than one who drifts between 3/8 and 3/4 inch, because every change in distance translates to a change in amperage and heat input. The weld bead width, penetration depth, and reinforcement height all shift in real time as stick out varies.
One practical trick is to use the nozzle as a visual reference. On most MIG guns, the contact tip is recessed a known distance inside the nozzle. If you keep the nozzle a consistent height above the workpiece, your stick out stays steady by default. Some welders rest the nozzle lightly on the joint for short tack welds to lock in the distance, though this isn’t practical for longer passes where you need freedom of movement.
For flux-core welding at longer stick out distances, the wire is more visible and easier to gauge visually, but the margin for error is also wider. Paying attention to the sound of the arc helps here. A steady, consistent crackling or hissing indicates stable stick out. A sputtering or popping sound usually signals that the distance is fluctuating too much or that your parameters need adjustment to match the stick out you’re actually running.