Brazing's a joining process whereby a filler metal or alloy's heated to melting temperature above —or, by the traditional definition in the United States, above —and distributed between two or more close-fitting parts by capillary action. At its liquid temperature, the molten filler metal and flux interacts with a thin layer of the base metal, cooling to form a strong, sealed joint. By definition the melting temperature of the braze alloy's lower (sometimes substantially) than the m… (More on Brazing)