Does Tungsten Size Always Matter?

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This video shows some differences in the arc plume when using different size tungsten electrodes.
Some textbooks will tell you to use the smallest size electrode possible.
But maybe there is more to it.
Using a small diameter tungsten makes the electrode get much hotter and seems to affect the arc plume quite a bit.
I was surprised to see a more confined arc using a 1/8" tungsten.

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