Yeah,
I was teasing you, just a little, not trying to actually blame.
But, now I think I notice that you're stating that you're using the Argon/CO2 C25 mix of gas with the 255EXT TIG, that you use for the Cigweld MIG unit, rather that 100% Argon to TIG weld with the 255EXT.
If that's the case, that's your problem.
Get some 100% Argon for both TIG welding steel on DCEN and also for welding aluminum on AC.
Easy peasy!
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