Quote:
Originally Posted by sanddrag
Anyhow, I switched over to the purple colored E3 tungstens (I think they're called) and it's a big difference. Real smooth buttery arc.
The only issue I'm having with these tungstens is that the arc wants to dance around a bit when starting, until you really punch it in with the pedal.
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I was wondering what was in a
purple electrode; I haven't seen those before. Turns out it's tungsten with 1.5% lanthanum oxide and small quantities of zirconium and yttrium oxides. I like the ceriated (grey) electrodes for 6061 aluminum with an AC inverter welder, and certainly prefer them to pure tungsten (green). Have you ever used those, and can you compare them?
(More information on inverter welders and electrode selection
here.)