Classification of electric soldering irons and certain safety measures
The electric soldering iron is an artifact for electronics enthusiasts. The welding of components determines the quality of the product, and the welding technology is the basic link to ensure the quality of welding, product quality and reliability. For example, internal heating electric soldering iron, external heating electric soldering iron, constant temperature electric soldering iron, tin suction electric soldering iron, etc.
Internal heating type electric soldering iron: It is composed of connecting rod, handle, spring clip, soldering iron core, soldering iron tip and so on. The soldering iron core of the electric soldering iron is placed in the soldering iron head, which is made of a nickel-chromium resistance wire wound around a porcelain tube.
External heating type electric soldering iron: Its soldering iron head is located in the soldering iron core, and it is made of copper alloy material with good thermal conductivity copper as the matrix. The soldering iron tip is retractable, if you want a higher temperature, shorten the soldering iron tip, otherwise, lengthen the soldering iron tip.
Constant temperature electric soldering iron: a magnet thermostat is placed in its soldering iron head 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-absorbing soldering iron: It is a desoldering tool that integrates a piston-type tin suction device and an electric soldering iron, which is flexible and convenient to use and has a wide range of applications.
Before using the electric soldering iron, it is best to measure the resistance of the power plug to judge whether the electric 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. If the resistance is zero, it means that there is a short circuit inside the soldering iron, and if the resistance is infinite, it means that there is an open circuit inside the soldering iron.
Some practices before using the electric soldering iron
When using a new soldering iron for the first time, ensure that the tip of the soldering iron is bright, heat and melt the solder while dipping in rosin and contact the solder wire several times, and evenly coat the tip of the soldering iron with a layer of solder. The purpose of this is not only to facilitate subsequent use, but also to prevent oxidation of the tip of the soldering iron. For the treatment of the old electric soldering iron before use, because it has been used for a long time, there will be a layer of oxide on the surface of the soldering iron tip, which makes the soldering iron tip not easy to eat tin. Therefore, the oxide on the surface of the soldering iron tip can only be removed with fine sandpaper or a file to make the surface bright. Then install a new electric soldering iron treatment method, and evenly coat the surface of the soldering iron head with a layer of solder.
Oxygen has nothing to do with the heating of the electric soldering iron. The electric soldering iron heats and melts the solder wire through alternating current. What the questioner said may be that the electric soldering iron does not eat tin, that is because the electric soldering iron is energized for too long and not used, this will accelerate the oxidation of the soldering iron core and burn it, shortening its service life. At the same time, it will also cause the tip of the soldering iron to be oxidized or burned to death by heating for a long time. Therefore, the electric soldering iron no longer eats tin. In the process of not eating tin, an oxidation reaction occurs, and the substance reacts chemically with oxygen, in which oxygen provides oxygen. Under normal circumstances, it is slowly oxidized, but the energized time is too long, and the temperature rises sharply, which provides reaction conditions for the oxidation reaction and accelerates the oxidation speed of the soldering iron tip and soldering iron core of the electric soldering iron.
