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The term "soldering" is defined in DIN 8505:
"Soldering is a method of connecting metallic materials using an additional melting metal, if necessary with the assistance of a flux and/or protective gas. The melting temperature of solder must lie beneath the minimum melting temperature of the base metals being connected. These base metals shall be tinned without melting themselves."
Soft solders commonly used on electronic equipment are to DIN 1707. Solder for copper and silver are tin lead and have a melting range 178-215° C, depending on the composition of the alloy. For soldering metallic materials the flux is defined by DIN 8511, P.2. Tests are explained in DIN 8526.