Classification of soldering irons and some practices to follow before using them
Soldering iron is an electronic enthusiasts of a magic weapon, components of the welding determines the quality of the product, welding technology is to ensure the quality of welding, product quality and reliability of the basic link. For example, with the endothermic soldering iron, external hot soldering iron, thermostatic soldering iron, tin-absorbing soldering iron and so on.
Endothermic soldering iron: by the connecting rod, handle, spring clip, iron core, iron head and other components. And the iron core of the soldering iron is placed in the iron head, which is made of nickel-chromium resistance wire wrapped around the porcelain tube.
External heat type soldering iron: its iron head is located in the iron core, with good thermal conductivity of copper as the substrate of copper alloy material and made. The iron head can be telescopic, if you want a high temperature, the iron head will be adjusted to shorten the point, and vice versa, will be adjusted to the iron head longer.
Constant temperature soldering iron: its soldering iron head placed inside the magnet type thermostat, for the control of the energization time. If the welding temperature is not high, the welding time is not long, then use the constant temperature soldering iron.
Suction tin soldering iron: it will piston type tin sucker and soldering iron dissolved in one of the desoldering tools, flexible and convenient to use, wide range of application.
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 a few thousand ohms available, if the resistance is zero or infinity, it can not be used. Zero resistance indicates that there is a short circuit inside the soldering iron, and infinite resistance indicates that there is a broken circuit inside the soldering iron.
Some practices before using the soldering iron
For the initial use of the new soldering iron, to ensure that the head of the soldering iron bright, energized heating melted solder while dipped in rosin and many times in contact with the solder wire, the head of the soldering iron evenly coated with a layer of solder. The purpose of doing so, not only to facilitate the subsequent use, but also to prevent the soldering iron head oxidation. For the old soldering iron processing before use, because it has been used for a long time, the surface of the iron head will have a layer of oxides, resulting in the iron head is not easy to eat tin. So only the oxides on the surface of the soldering iron head with fine sandpaper or file to remove, so that its surface becomes bright. Then install a new soldering iron treatment, the soldering iron head surface evenly plated with a layer of solder.
Oxygen in fact has nothing to do with the soldering iron heating, the soldering iron through the alternating current and heating melting solder wire. And the questioner said may be the soldering iron does not eat tin, that is, because the soldering iron is powered for too long and do not use, in this case will accelerate the soldering iron core oxidation and burn off, shorten its service life. At the same time, it will also lead to the soldering iron head for a long time heating and oxidation or burned. Therefore, the soldering iron no longer eat tin. In this process of not eating tin there is an oxidation reaction, the substance and oxygen chemical reaction, in which oxygen provides oxygen. Under normal circumstances is slow oxidation, can be energized for too long, the temperature rises sharply, which gives the oxidation reaction provides the reaction conditions, accelerating the oxidation speed of the soldering iron iron head and the soldering iron core.
