Welding skills of electric soldering iron in the maintenance and production process
Welding work is essential in the maintenance and production process. It not only requires the components to be fixed on the circuit board, but also requires the solder joints to be firm and smooth. Therefore, the quality of welding technology directly affects the success of electronic production. Therefore, welding technology is a basic skill that every electronic production enthusiast must master. Now, let's introduce the key points of welding:
1. The selection of electric soldering iron The power of an electric soldering iron should be determined by the size of the solder joint. The area of the solder joint is large, and the heat dissipation speed of the solder joint is also fast. Therefore, the power of the chosen electric soldering iron should also be higher. The power of a general electric soldering iron includes 20W25W30W35W50W, and so on. Choosing a power of around 30W is more appropriate. After prolonged use, a layer of oxide will form on the tip of an electric soldering iron, making it difficult for it to eat tin. In this case, you can use a file to remove the oxide layer, turn on the soldering iron, and when the tip is slightly hot, insert rosin and apply solder to continue using it. Newly purchased electric soldering irons must also be tinned before use.
2. Low melting point solder wire and non corrosive flux, such as rosin, should be used for soldering and flux. Industrial solder and corrosive acidic solder oil should not be used. It is best to use solder wire containing rosin, which is very convenient to use.
3. Welding method: The components must be cleaned and tinned. During storage, electronic components may have a layer of oxide film attached to the 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 enamel) before welding. After the above treatment, the components are easy to solder firmly and are not prone to false soldering.
The temperature and time of welding should be such that the temperature of the electric soldering iron is higher than the temperature of the soldering tin, but it should not be too high. It is better for the soldering iron head to come into contact with rosin and smoke just now. 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 solder joint is rough, it is easy to cause virtual soldering. Conversely, if the welding time is too long, the solder is prone to flow, and it is easy to cause overheating and damage to the components.
The amount of solder on the solder joint should not be too small. If it is too small, the soldering will not be firm and the mechanical strength will be poor. And too much can easily cause a lot of appearance and internal disconnection.
Soldering should just submerge all the pins of the components on the solder joint, and the outline should be vaguely visible.
Pay attention to the position of the soldering iron and welding points. Beginners generally move the electric soldering iron back and forth or squeeze it forcefully at the welding point. This method is incorrect. The correct method is to use the tinned surface of an electric soldering iron to contact the welding point, which has a large heat transfer area and a fast welding speed.
4. Inspection after welding: After welding, it is necessary to check for any solder leaks, solder joints, or short circuits in components caused by solder flow. Virtual soldering is difficult to detect, so you can use tweezers to clamp the component pins and gently pull them. If any shaking is found, it should be repaired immediately
