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Thus, the temperature of the soldering iron core is automatically maintained in the operating range without using a sensor or electronic control.

When the temperature drops to a certain value, the ferromagnetic properties of the coating are restored again, core heating starts again. When the temperature reaches the required value, the ferromagnetic coating no longer has magnetic properties, as a result of which the core no longer heats up. In this material, the coil forms a magnetic field, from which a current is induced to heat the soldering iron core. The tip is made of a coating of ferromagnetic material. In this device, the rod is heated by an induction coil. They have their advantages: fast heating, increased service life (if you take care of it), a wide range of power and temperature. Such heaters are recognized as more advanced. It heats up from the voltage applied to its contacts. There are also designs of soldering irons, in which the heater is ceramic, in the form of a rod. In more advanced designs, nichrome is built into insulators, which reduce heat loss, increase heat transfer. It is wound on a casing made of insulating material. Simple soldering irons have a nichrome spiral in their design. Electric soldering irons with a nichrome heater have several different designs. The temperature sensor is made on the principle of a thermocouple.