Can you change a soldering iron to a small degree fish heating rod

No. Heating rod can not be changed to a soldering iron. If the heating rod needs to be soldered, then the melting point of the soldering support material must be higher than the maximum temperature of the heating rod work. Solder wire melting temperature is only a few dozen to more than a hundred degrees can be, while the working temperature of the heating rod can reach hundreds of thousands of degrees of temperature, so that the heating rod can not be welded with solder wire.