Which are the materials generally employed as solder in soldering operation in elections.

1. The question asks about the materials generally employed as solder in electronics soldering operations. 2. Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. 3. In electronics, the most common type of solder (especially traditionally, before lead-free regulations became widespread) is an alloy of lead (Pb) and tin (Sn). 4. The ratio varies (e.g., 60% tin / 40% lead, or 63% tin / 37% lead - eutectic solder), offering desirable properties like a low melting point and good flow. 5. Iron and aluminium are not typically used as the primary components of electronic solder.