What classification do solders fall under due to their composition of two or more metals?

Solders are classified as alloys because they are composed of two or more metals that are blended together to create a material that has specific properties suitable for joining metal parts. An alloy typically possesses a different set of characteristics than the individual metals that comprise it, enhancing attributes like strength, ductility, or melting point to meet the demands of soldering applications.

This classification underlines the importance of the metallic combination in soldering processes, as the resulting alloy can have a melting point that is lower than that of the constituent metals, making it effective for joining purposes without damaging the workpieces. Unlike mixtures, which do not have a homogeneous composition or uniform physical properties, alloys are defined by their consistent structural and compositional characteristics. Compounds and solutions involve different kinds of chemical interactions that do not apply to the physical blending seen in solders.