I thought we were discussing an inverter machine too but I see now that there has been no mention of the machine itself.
In the shop I used to work at we switched over to RED electrodes (even for Aluminum) in our Sync 250 years ago... you have to resharpen the electrode fairly often but it still typically beats the GREEN. Well, that is for weld aluminum castings anyway the RED takes WAYYYY more heat.
I have to agree with Greg though I do not like balled tungsten.
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