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Thom, I dont know details on the square wave, but the "stick" feature of my econotig will weld heavy stuff (even in tig mode it will weld fairly thick stuff, but being aircooled, it will get too hot to hold if tig welding at high amperage for long continuous periods). I have welded 1/4" steel many times in tig mode without issue as long as it is just a couple inch long stitches at a time.
There are some sweet small compact wave tig welders on the market today at reasonable prices, but they do not work for aluminum. The ones I am talking about will weld nearly paper thin steel and stainless steel superbly, but they do not have the AC high frequency mode for aluminum FWIW.
I guess what I am saying is that if the majority of your welding is 1/4" or less, the tig will do it all with excellant weld quality yet still allow you
to occasionally weld small amounts of heavy stuff in tig mode or large quantities of heavy stuff in stick mode.
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