If you melt copper metal and tin metal pieces together, to make a bullion ingot bar, is that bronze now?
Many different mixtures have been used to create what is called bronze. 88% copper and 12% tin Commercial bronze: 90% copper and 10% zinc. Architectural bronze: 57% copper, 3% lead and 40% zinc. Bismuth bronze: 52% copper, 30% nickel, 12% zinc, 5% lead 1% bismuth. Basically bronze is a mixture of two or more metals with copper usually as the main ingredient much like common brass.
Melting the metals together is a tricky operation because tin has a very low melting point (about 500F as I recall) and brass melts at over 1900F. Just starting to heat a mixture will tend to burn out the tin before the copper melts. Either the copper has to be melted with protection from oxidation and bits of tin stirred in or the whole has to be heated very quickly (and cooled) as with inductive heating with oxygen held off.
