In the article "Preparing for Aluminum GTAW" by Frank Armao, what are the author's recommendations for preparing aluminum base metal for welding ?
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You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?

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