An electric soldering iron is a kind of electric heating device.
Electricity can generate a high temperature of about 250 ℃. During the soldering process, an electric soldering iron is actually a process of heat conduction. When it comes into contact with the soldering surface, the heat on the soldering iron tip is transferred to the solder, which absorbs the heat and melts, flowing and forming a bright and round solder joint under surface tension. In the process of welding heat conduction, due to the fact that metals are good conductors of heat, heat transfer is fast. During the melting process of solder, due to the heat loss of the soldering iron tip, its temperature decreases to some extent. If the solder joint area is large, it needs to absorb more heat to make the solder on it reach the melting point. If the volume of the soldering iron tip is small and stores less heat, the temperature drops quickly. Due to the small power of the soldering iron core, the heat generated cannot replenish the lost heat. At this time, the most obvious phenomenon is that the solder does not melt or melts incompletely. In this case, we need to use a high-power soldering iron for welding. On the contrary, if the welded part is small, we do not need to use a high-power soldering iron; If using a high-power soldering iron, be sure to pay attention to the soldering time, otherwise excessive heat can easily cause damage to the circuit board through which the current flows, resulting in the printed copper foil falling off. There is no specific quantitative requirement for the appropriate power of a soldering iron, and the long-term work experience accumulated by maintenance personnel is the best way to choose a soldering iron that suits oneself.
