Cold soldering with electric soldering iron and its prevention and treatment methods
When welding, it should be ensured that each welding point is firmly welded and has good contact. The solder points should be bright, smooth, and free of burrs, and the amount of solder should be moderate. Tin and the object to be welded should be firmly fused without any virtual welding. The so-called virtual soldering refers to the situation where only a small amount of tin is soldered at the solder joint, resulting in poor contact and intermittent continuity. To avoid virtual soldering, the following points should be noted:
(1) Ensure the cleanliness of metal surfaces
If there are rust stains, dirt, or oxides on the surface of the welded parts and welding points, they should be scraped or sanded with a knife or sandpaper before welding until a bright metal is exposed, and then tin can be plated on the surface of the welded parts or welding points.
(2) Master the temperature
In order to maintain an appropriate temperature, a soldering iron with appropriate power should be selected according to the size of the components, and attention should be paid to controlling the heating time. If a low-power soldering iron is used to solder large components or ground wires on a metal substrate, it is easy to form virtual soldering.
When the soldering iron tip is pressed onto the soldering area with solder, if there is no or very little solder left at the soldering area after removing the soldering iron, it indicates that the heating time is too short, the temperature is not enough, or the object being soldered 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 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, so that the solder can sufficiently wrap around the object being soldered, forming a suitable and smooth solder joint. If there is not enough tin applied at once, it can be replenished, but the soldering iron must be removed after the previous tin is melted together.
(4) Select appropriate soldering flux
The function of soldering flux is to improve the fluidity of solder, prevent oxidation of the welding surface, and play a role in assisting welding and protection. When soldering electronic components, it is advisable to avoid using solder paste as much as possible. A better soldering flux is rosin alcohol solution. When soldering, just drop a little on the welded area.
