Welding process of electronic components in mounting processing
Welding process is an important process in the assembly process of electronic products. The quality of soldering directly affects the performance of electronic circuits and electronic devices. Excellent soldering quality can provide good stability and reliability for the circuit. Poor soldering methods can lead to component damage, which brings great difficulties to the test, and sometimes leaves hidden dangers and affects the reliability of electronic equipment.
As the complexity of electronic products increases, more and more components are used. Some electronic products (especially some large electronic devices) use hundreds of thousands of components, and the quantity of solder joints is tens of thousands. A bad solder joint in the chip processing will affect the reliability of the entire product. Welding quality is the key to the quality of electronic products. Therefore, mastering the skills of skilled welding operations is very important for the production of first-line technicians.
Welding is generally divided into three categories: contact welding, fusion welding and brazing.
1,Contact welding: During the welding process, the welding must be applied with pressure (heated or not heated) to complete the welding. Such as ultrasonic welding, pulse welding, friction welding, etc.
2,Fusion welding: Fusion welding refers to the method of heating the weldment joint to the molten state during the welding process and completing the welding without applying pressure. Such as arc welding, gas welding, etc.
3,Brazing: Brazing uses a metal material that is lower than the melting point of the soldered part as a solder, and heats the soldering piece and the solder to a temperature higher than the melting point of the solder and lower than the melting point of the soldered material, and is wetted by the liquid solder. And interdiffuse with the object to be welded to achieve the connection.
Brazing can be divided into brazing and soldering depending on the melting point of the solder used. Welds using solder with a melting point higher than 4500C are called brazing; solders with a melting point of solder below 4500C are used. The so-called “welding” in the installation process of electronic products is a kind of soldering, which mainly uses low-melting alloy materials such as tin and lead as solder, so it is commonly called “soldering”.
The mechanism of welding: The soldering of electronic circuits seems to be simple. It seems to be only the process of combining molten solder with the metal to be soldered (base metal), but the microscopic mechanism is very complicated. It involves physics, chemistry, and materials science, electrical and other related knowledge. Familiar with the basic theory of welding, in order to be able to deal with all kinds of problems in the welding, to improve the welding quality of the welding joints.
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