Why doesn't the soldering iron's soldering wire stick?
Soldering iron is every electronic DIY enthusiasts, home appliance repair personnel necessary tools, in the use of the process of the most common problem is the soldering iron head does not eat tin. For this problem many partners do not know what causes it does not eat tin, and do not know how to repair it.
Introduction and working principle of the soldering iron
Soldering iron mainly by the handle, power cord, heating core, iron head, mica composition (some precision and a variety of temperature control circuits) in accordance with their heating method can be divided into two categories of endothermic and exothermic soldering iron, they correspond to different occasions of use. The reason why it is called endothermic soldering iron, because the endothermic soldering iron iron head is hollow, its heating core in the iron head of the internal hollow, so it is called endothermic soldering iron.
Endothermic soldering iron iron head, the last side of the hollow structure
The external heat type soldering iron soldering iron head is just the opposite of the internal heat type soldering iron, the external heat type soldering iron iron head is solid, generally made of copper material. The heating core of the external hot iron is directly wrapped around the iron head, that is, the iron head is inserted in the interior of the heating core, so it is also known as the external hot iron.
Externally heated soldering iron tip, solid structure
Whether it's an internal or external soldering iron, they all work on the same principle. The power plug of the soldering iron introduces household AC220V into the two ends of the heating core, which is electrified and heats up.
Heat core issued by a small part of the heat dissipated into the surrounding air, most of the heat is still exported to the head of the soldering iron, the head of the soldering iron can reach a temperature of 200-450 degrees, and then can melt the solder for welding.
Why the soldering iron does not stick to the solder
1, the soldering iron is used for a long time, the internal heating core aging or damage, the heat issued can not reach the melting point of the solder, resulting in the soldering iron head does not stick to the solder.
2, the daily use of the process, after the use of the soldering iron does not have a soldering iron head for tin treatment, resulting in the soldering iron head in the high temperature and air oxidation.
Oxidized black soldering iron tip
3, after using the soldering iron, did not do in time to cut off its power supply. The soldering iron is in a high temperature state for a long time, and air oxidation, resulting in non-stick solder.
4, daily welding in pursuit of convenience, the use of acidic flux, flux in the high temperature state makes the soldering iron head oxidation.
5, the iron head itself, the use of some of the material is not good iron head, such as some iron head directly iron, this kind of iron head itself is very easy to oxidize.
