Welding method of electric soldering iron, inspection requirements after soldering with electric soldering iron
1. Inspection before welding
Components must be clean and tin-plated. When electronic components are being stored, due to the oxidation of air, there will be an oxide film on the component pins, as well as other dirt. Before welding, you can use a knife to scrape off the oxide film and immediately apply a layer of it. Solder (commonly known as tin enamel), and then solder.
After the above treatment, the components are easily soldered firmly and the phenomenon of false soldering is less likely to occur.
2. Welding temperature and welding time
When welding, the temperature of the soldering iron needs to be higher than the temperature of the solder, but not too high. It is better for the soldering iron tip to just smoke when it touches the rosin.
Master the welding time. If the welding time is too short, the temperature of the solder joint is too low, the solder joint is insufficiently melted, and the solder joint is rough, which may easily cause false soldering. If the welding time is too long, the solder will flow easily, causing overheating and damage to the components.
3. The number of tinned solder joints
The amount of solder on the soldering point cannot be too small. If it is too small, the welding will not be strong and the mechanical strength will be too poor. If there are too many, it will easily result in a lot of appearance but not connected internally.
The solder should just immerse all the component pins on the soldering point, and the outline should be vaguely visible.
4. Pay attention to the position of the soldering iron and soldering points.
For novices, when welding, they generally move the soldering iron back and forth over the welding point or squeeze it hard. This is a wrong welding method. The correct method: Use the tin-lined surface of the electric soldering iron to contact the soldering point. The heat transfer area is large and the soldering speed is fast.
5. Inspection after welding
After welding, it is necessary to check whether there are any missing solders, weak solders, and component short circuits caused by solder flow. Welding is generally not easy to detect. You can use tweezers to hold the component pins and pull gently. When shaking is found, repair the soldering immediately.
