Inspection requirements for electric soldering iron after welding
1. Inspection before welding
Components must be cleaned and tinned. During storage, electronic components may have a layer of oxide film attached to their pins due to air oxidation, as well as other dirt. Before welding, a small knife can be used to scrape off the oxide film and immediately apply a layer of solder (commonly known as tin lining) before welding.
After the above treatment, the components are easy to solder firmly and are not prone to false soldering.
2. Welding temperature and welding time
When welding, it is necessary to make the temperature of the electric soldering iron higher than the temperature of the soldering tin, but not too high. It is better to make the soldering iron tip come into contact with the rosin and smoke just now.
Master the welding time well. If the welding time is too short, the temperature of the solder joint is too low, the melting of the solder joint is not sufficient, and the roughness of the solder joint can easily cause false welding; If the welding time is too long, the solder is prone to flow, which can cause overheating and damage to the components.
3. Number of tin applied to welding points
The amount of solder on the welding point should not be too small, as it is too small and the welding is not firm, and the mechanical strength is also too poor. Too much can easily cause a large appearance and internal disconnection.
Solder should just immerse all the component pins on the soldering point, and the contour should be faintly visible.
4. Pay attention to the position of soldering iron and welding points
For beginners, it is generally the wrong welding method to move the electric soldering iron back and forth or squeeze it forcefully during welding. The correct method is to use the tin coated surface of an electric soldering iron to contact the welding point, which has a large heat transfer area and fast welding speed.
5. Inspection after welding
After the welding is completed, it is necessary to check for solder leaks, faulty soldering, and short circuits of components caused by solder flow. False soldering is generally not easy to detect. You can use tweezers to clamp the component pins and gently pull them. When shaking is found, it should be repaired immediately.
