Just to jump on the bandwagon, I use 20 mule team out of the box. It works very well on most everything from Wrought Iron to the tool steels I use. I lately started adding a small amount of Boric Acid to the Borax, because I started playing with Meteorites, and the high nickel needed a little help.
What I find amusing is comments from people that, from my talking to them in other contexts, I know have never welded, but seem to think they know more about how to do many things better than those of us that do those things regularly. Its a sad fact of the Internet I am afraid, as it makes knowing the real information hard to discern. But as for the matter at hand if I was only allowed one flux, it would be Borax, as its cheap, safe, and it works well for most welds. (look what is used as a flux coating on some welding rods for example)
enough of my ranting, I return you to your regularly scheduled programs.
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