False soldering of electric soldering iron and its prevention and control methods
When welding, ensure that each solder joint is firmly welded and has good contact. The solder joints should be bright, smooth, and free of burrs, with a moderate amount of tin. Tin and the solder should fuse firmly and there should be no false soldering. The so-called virtual soldering refers to the situation where only a small amount of solder is stuck at the solder joint, causing poor contact and intermittent disconnection. To avoid virtual welding, the following points should be noted:
(1) Ensure the cleanliness of the metal surface
If there are rust stains, dirt, or oxides on the surface of the solder joint or solder joint, it should be scraped with a knife or sandpaper before welding until bright metal is exposed before tin plating can be applied to the surface of the solder joint or solder joint.
(2) Mastering temperature
In order to ensure appropriate temperature, a soldering iron with appropriate power should be selected based on the size of the components, and attention should be paid to controlling the heating time. If a low-power soldering iron is used to weld large components or ground wires on a metal substrate, it is easy to form virtual soldering.
When the soldering iron head is pressed with solder at the welding point, if there is no solder left or very little solder left at the soldered area after removing the soldering iron, it indicates that the heating time is too short, the temperature is not enough, or the soldered object is too dirty; If the solder flows down before removing the soldering iron, it indicates that the heating time is too long and the temperature is too high.
(3) Apply an appropriate amount of tin
Determine the amount of solder to be dipped into the soldering iron based on the size of the required solder joint, ensuring that the solder is sufficient to wrap around the object being soldered, forming a suitable and smooth solder joint. If not enough tin is added at once, it can be added again, but the soldering iron must be removed after the previous tin has been melted together.
(4) Choose appropriate soldering flux
The function of flux is to improve the fluidity of the solder, prevent oxidation of the welding surface, and provide welding assistance and protection. When soldering electronic components, solder paste should be avoided as much as possible. A better flux is rosin alcohol solution. When welding, just drop a little on the welded area.
