A base metal is a metal such as copper, zinc, tin, or lead that is not a precious metal. precious metal. a metal that is not very valuable, such as iron or lead
the metal at and adjacent to the surface to be incorporated in a welded joint that will be fused and which will produce a welded joint through coalescence and interdiffusion with the weld
(1) The metal present in the largest proportion in an alloy; brass, for example, is a copper-base alloy (2) An active metal that readily oxidizes, or that dissolves to form ions (3) The metal to be brazed, cut, soldered, or welded (4) After welding, that part of the metal which was not melted
(1) Any metal other than a precious or noble metal (2) The principal metal of an alloy (3) The principal metal of a piece underlying a coating of another metal Example: Iron (Fe), aluminum (Al), magnesium (Mg), copper (Cu), nickel (Ni), zinc (Zn)