I know that for welding steel, I am supposed to use 2% thoriated tungsten,(red band), and for welding aluminum, I'm supposed to use pure tungsten(green band). I use 2% thoriated for all my welding, and get excellent results. I have tried pure tungsten on aluminum, but I find no difference. I ball my tungsten on a piece of copper before use on aluminum, and grind to a sharp point for steel. Could someone please tell me why you have to use different tungstens for different materials?? Thanks. Dan B.
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