Inspection requirements after soldering iron
1. Inspection before welding
Components must be cleaned and tinned. Electronic components are in storage. Due to the effect of air oxidation, a layer of oxide film is attached to the component pins, and there are other dirt. Before welding, the oxide film can be scraped off with a knife, and a layer should be applied immediately. Solder (commonly known as enamel), and then solder.
After the above treatment, the components are easy to weld firmly, and the phenomenon of virtual welding is not easy to occur.
2. Welding temperature and welding time
When soldering, it is necessary to make the temperature of the electric soldering iron higher than the temperature of the solder, but not too high. It is better that the soldering iron tip contacts the rosin and just smokes.
Master the welding time well. If the welding time is too short, the temperature of the solder joints is too low, the solder joints will not melt sufficiently, and the solder joints will be rough and easy to cause false welding; if the welding time is too long, the solder will flow easily, which will easily cause the components to overheat and damage the components.
3. The amount of tin on the soldering point
The amount of solder on the soldering point should not be too small, if it is too small, the welding will not be strong, and the mechanical strength will be too poor. Too much will easily cause a lot of appearance and no connection inside.
The solder should just submerge all the component leads on the soldering point, and the outline should be faintly visible.
4. Pay attention to the position of the soldering iron and soldering points
For novices, when soldering, generally move the soldering iron back and forth or squeeze hard at the soldering place, which is the wrong soldering method. The correct method: use the tin-coated surface of the electric soldering iron to touch the soldering point, the heat transfer area is large, and the welding speed is fast.
5. Inspection after welding
After soldering, it is necessary to check whether there are missing soldering, virtual soldering, and component short circuits caused by solder flow. False soldering is generally not easy to find. You can use tweezers to hold the component pins and pull it gently. When shaking is found, the soldering should be repaired immediately.
