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[Will]

I have welded with both the HH175 and the MM175. The Hobart has taps, and the Miller is infinitely adjustable. Both weld fine. I would buy the 210 if it has the right capacity for you and don't worry about the 7 taps. The HH175 only has 4 taps, and it works fine for me.

[Will]

TIG

Here is a site that explains the reccommended use for each type of TIG electrode:
http://www.diamondground.com/diamond...nmaterial.html...

[Will]

electrodes

I thought the 2%thoriated were for DC only....Are you saying that they can be used on aluminum and AC? I have always used pure tungsten on aluminum and AC.