Soldering iron is quite popular hand tool commonly used to solder components with each other. It works on a very basic principle. When we pass current through a high resistant material, heat is generated. We use this heat to melt down a conductor metal also called soldering wire and putting it between two components in order to connect them electrically.A general soldering iron consists of a heating region and an insulated handle. On supplying electrical current to the soldering iron, the heating tip gets heated and with the help of a soldering wire it joins two components.