Why the electrode sticks and how to stop it

An electrode freezes into the joint when the arc cannot deliver enough energy to keep the tip molten. There are five reasons for that, and they are worth checking in order of how often they are the cause.

1. Current too low

The commonest reason by a wide margin. Below roughly 30 A per millimetre of core diameter the arc will not sustain itself: the tip touches, cools, and welds itself to the plate.

Add 10 A and try again. If the arc settles and the bead flattens out, that was it. The starting figure for your diameter, position and coating comes from the current calculator.

2. A poor return connection

The clamp on painted, rusty, galvanised or oily steel makes a resistive contact, and the voltage disappears there instead of at the arc. Symptom: the machine reads the right current but the arc feels weak, and the clamp is warm after ten minutes.

Grind a patch of bare metal for the clamp, and clamp onto the workpiece itself rather than onto a bench that is only touching it. A clamp on a bench that happens to be under the job is a connection through two more contact resistances.

3. Cable too thin or too long

A long, undersized lead drops the voltage before it reaches the arc. Thirty metres of 25 mm² at 200 A loses several volts, and a stick arc has only about 25 to spare. The symptom is unmistakable: the machine welds fine on the bench and sticks at the far end of the extension.

4. Damp electrodes

A basic electrode that has taken up moisture strikes badly, crackles irregularly and sticks. Baking at 300–350 °C for two hours fixes it; a heated quiver stops it happening again. Rutile electrodes are much less sensitive — see electrode coating types.

5. Striking technique

Two methods, and both need the same thing: movement. Scratch — draw the tip across the plate like a match and lift immediately to about one electrode diameter. Tap — touch and lift straight away. What sticks the electrode is holding it still against the plate, which is exactly what a beginner does while waiting to see if the arc started.

Also: on some machines an arc-force or hot-start control exists precisely for this. Turning arc force up increases the current briefly when the arc shortens, which burns the tip free instead of letting it freeze.

Working through it

1. Add 10 A. Most cases end here.
2. Look at the return clamp and where it is attached.
3. Feel the cable and connectors after a few minutes — warm means resistance.
4. Try a fresh electrode from a sealed packet.
5. Check the arc force setting if the machine has one.

Updated: 14 August 2026