Classification of electric soldering irons and some practices before using them
The soldering iron is an artifact for electronics enthusiasts. The welding of components determines product quality. Welding technology is the basic link to ensure welding quality, product quality and reliability. For example, internal heating soldering iron, external heating soldering iron, constant temperature soldering iron, soldering iron, etc. are used.
Internal heating electric soldering iron: It consists of connecting rod, handle, spring clip, soldering iron core, soldering iron head, etc. The soldering iron core of the electric soldering iron is placed in the soldering iron head, which is made of nickel-chromium resistance wire wrapped around a porcelain tube.
External heating electric soldering iron: Its soldering iron head is located in the soldering iron core and is made of copper alloy material with good thermal conductivity. The soldering iron head is retractable. If you want the temperature to be higher, make the soldering iron head shorter. Otherwise, make the soldering iron head longer.
Constant temperature electric soldering iron: Its soldering iron head is equipped with a magnet-type temperature controller for controlling the power-on time. If the soldering temperature is not high and the soldering time is not long, a constant temperature electric soldering iron can be used.
Soldering iron: It is a desoldering tool that combines a piston type desoldering device and an electric soldering iron. It is flexible and convenient to use and has a wide range of applications.
Before using the 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. If the resistance is zero or infinite, it cannot be used. If the resistance is zero, it means there is a short circuit inside the soldering iron; if the resistance is infinite, it means there is an open circuit inside the soldering iron.
Some tips before using a soldering iron
When using a new soldering iron for the first time, make sure the soldering iron tip is bright, apply electricity to heat and melt the solder, dip it in rosin, and touch the soldering wire multiple times to evenly coat the soldering iron tip with a layer of solder. The purpose of this is not only to facilitate subsequent use, but also to prevent oxidation of the soldering iron tip. Regarding the treatment of old electric soldering irons before use, after long-term use, there will be a layer of oxide on the surface of the soldering iron tip, making it difficult for the soldering iron tip to eat tin. So the only way to remove the oxide on the surface of the soldering iron tip is with fine sandpaper or a file to make the surface bright. Then install a new soldering iron and apply a layer of solder evenly on the surface of the soldering iron tip.
Oxygen actually has nothing to do with the heating of the soldering iron. The soldering iron heats and melts the solder wire through alternating current. The questioner may be saying that the soldering iron does not eat tin. That is because the soldering iron is powered on for too long and not used. This will accelerate the oxidation of the soldering iron core and cause it to burn out, shortening its service life. At the same time, it will also cause the soldering iron tip to be oxidized or burned due to prolonged heating. Therefore, the soldering iron no longer eats tin. In the process of not eating tin, an oxidation reaction occurs, and a chemical reaction occurs between substances and oxygen, in which oxygen provides oxygen. Under normal circumstances, it oxidizes slowly, but if the power is applied for too long, the temperature rises sharply, which provides reaction conditions for the oxidation reaction and accelerates the oxidation rate of the soldering iron tip and core.
