I assumed you were a welder because of tungsten. Maybe not? Anyways, aluminum is easy enough to weld if you have the tools/skills.... Never actually tried brazing it but maybe it's working for you. As far as grinding, use a sanding disc (I call them Flapper discs). Basically a whole bunch of overlapping pieces of sandpaper made into a disc. They will clog up quick with soft metals like aluminum though. Might need a few.
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