Soldering

—The act or proce of forming joints upon or between metallic surfaces, by means of a fusible alloy or solder, whose melting point ‘is lower than that of the metals sought to be united. After careful cleansing, a flux is applied to prevent oxidation while heated,a suitable quantity of solder is fused on the joint, by a heated copper bit or by the blow pipe flame, according as to whether soft or hard solder is employed. The soft solder easily follows the track of the iron, along the heated parts, by surface tension, but the hard solder requires more careful preparation and manipulation.