Influence of the tip angle – Tungsten electrodes

Influence of the tip angle – Tungsten electrodes


The influence of the tip angle on the puddle,
the heat penetration and the arc stability. It is often thought that a pointed tip
creates a smaller puddle, But in reality, with a tip of 30 degrees, you’ll
have a larger puddle than with a tip of 60 degrees. The reason for this is that an electron
always leaves the material perpendicularly. This means that the arc gets wider
with a 30 degree tip, and the electron has to travel
a longer distance. A characteristic of an electron is that
the longer it travels, the more energy it loses. At a 60 degree tip, the distance travelled is shorter
and so the electron will have more energy when it reaches the workpiece. The puddle is smaller, the arc stability is better,
and the heat penetration is deeper. From now on you know that this is not true, and this is what really happens.

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