Classification of electric soldering irons and some practices before use
Electric soldering iron is a divine tool for electronic enthusiasts, and the welding of components determines product quality. Welding technology is a fundamental link to ensure welding quality, product quality, and reliability. For example, internally heated electric soldering irons, externally heated electric soldering irons, constant temperature electric soldering irons, tin absorbing electric soldering irons, etc.
Internally heated electric soldering iron: composed of a connecting rod, handle, spring clip, soldering iron core, soldering iron head, etc. The soldering iron core of the electric soldering iron is placed inside the soldering iron head, which is made of nickel chromium resistance wire wrapped around a porcelain tube.
Externally heated electric soldering iron: Its soldering iron head is located inside the soldering iron core and is made of copper alloy material with good thermal conductivity as the substrate. The soldering iron head is retractable. If you want a higher temperature, make the soldering iron head shorter, and vice versa, make the soldering iron head longer.
Thermostatic electric soldering iron: Its soldering iron head is equipped with a magnetic thermostat for controlling the power on time. If the welding temperature is not high and the welding time is not long, a constant temperature electric soldering iron can be used.
Tin suction electric soldering iron: It is a soldering tool that integrates a piston type tin suction device and an electric soldering iron, making it flexible and convenient to use, with a wide range of applications.
Before using an electric soldering iron, it is best to measure the resistance of the power plug to determine whether the soldering iron can be used. If the resistance is several thousand ohms, it can be used, but if the resistance is zero or infinite, it cannot be used. A zero resistance indicates a short circuit inside the soldering iron, and an infinite resistance indicates an open circuit inside the soldering iron.
Some practices before using electric soldering irons
When using a new electric soldering iron for the first time, ensure that the head of the soldering iron is bright, heat and melt the soldering tin while dipping it in rosin and repeatedly contact the soldering wire, and evenly coat the head with a layer of soldering tin. The purpose of doing so is not only to facilitate subsequent use, but also to prevent oxidation of the soldering iron head. For the treatment of old electric soldering irons before use, due to their long-term use, there will be a layer of oxide on the surface of the soldering iron head, which makes it difficult for the soldering iron head to eat tin. So only by removing the oxide on the surface of the soldering iron head with fine sandpaper or a file, can the surface become shiny. Then install a new electric soldering iron treatment method and evenly coat the surface of the soldering iron head with a layer of welding.
Oxygen is actually not related to the heating of an electric soldering iron, which heats and melts the solder wire through alternating current. The questioner may be saying that the electric soldering iron does not eat tin, which is because the electric soldering iron is energized for a long time and not used, which will accelerate the oxidation of the soldering iron core and burn it out, shortening its service life. At the same time, it can also cause the soldering iron head to oxidize or burn out after prolonged heating. Therefore, the electric soldering iron no longer eats tin. During the process of not eating tin, an oxidation reaction occurs, where the substance undergoes a chemical reaction with oxygen, which provides oxygen. Under normal circumstances, it is slowly oxidized, but can be energized for too long and the temperature rises sharply, providing reaction conditions for the oxidation reaction and accelerating the oxidation rate of the soldering iron head and core.
