Selection of electric soldering iron and introduction of soldering methods
When choosing an electric soldering iron, it is generally determined by the size of the soldering point. If the area of the soldering point is large, the heat dissipation speed is also fast. Therefore, the electric soldering iron chosen has a faster heating speed and higher power. We commonly use soldering irons with powers of 20W, 25W, 30W, 35W, 50W, and so on. Choosing a power of around 30W is more suitable. Here, the editor is using a soldering iron stand, which is the kind shown in Figure 1. The heating temperature can be adjusted at any time, which is convenient, but it is inconvenient to carry.
The iron head
After long-term use, the soldering iron tip will generate a layer of oxide, which is not easy to solder. We can file off the oxide layer or scrape it off with a small knife. Then, turn on the soldering iron, heat it slightly, and you can apply rosin. Next, apply soldering tin.
Soldering and soldering flux
When selecting solder, we should use low melting point solder wire and non corrosive flux, such as rosin. Industrial solder and corrosive acidic solder oil should not be used. Of course, there is also a type of solder wire in the market that contains rosin, which is very convenient for us to use.
Attention: The new soldering iron must be coated with rosin when used for the first time.
Tin suction device and cleaning sponge
The purpose of a tin absorber is to remove excess welding wire and disassemble electronic components.
The purpose of the cleaning sponge: When in use, it should be soaked in clean water to remove dirt from the tip of the soldering iron, making it easier to tin. After using the soldering iron, use it to clean the tip.
welding method
Action tips: Heat first and then solder, remove solder first and then remove soldering iron.
During the storage of electronic components, due to the oxidation effect of air, there is a layer of oxide film attached to the pins of the components, as well as other dirt. Before soldering, we need to clean the components and coat them with a layer of tin. That way, the solder joints we weld together are less likely to experience virtual soldering.
Welding temperature and welding time
We should choose a suitable temperature when soldering, which should be higher than the soldering temperature. If it is too high, it is not good. In severe cases, the solder pad will fall off directly. It is better to use a soldering iron tip that has just smoked when it comes into contact with the rosin.
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 solder joint is rough, which can easily cause virtual soldering. Conversely, if the welding time is too long, the solder is easy to flow and the components are prone to overheating and damage.
