Welding process of electronic components in SMT chip processing

Welding process of electronic components in SMT chip processing

Soldering is an important process in the assembly process of electronic products. The quality of welding directly affects the performance of electronic circuits and electronic devices. Excellent welding quality for electricalThe circuit provides good stability and reliability. Poor soldering methods will cause damage to components, bring great difficulties to the test, and sometimes leave hidden dangers, affecting the reliability of electronic equipment.sex. The following is an introduction to SMT chip processing. Welding process of electronic components.

The welding process of electronic components in SMT chip processing is generally divided into three categories: contact welding, fusion welding and brazing.

1. Contact welding: During the welding process, pressure must be applied to the weldment to heat or not) to complete the welding method. Such as ultrasonic welding, pulse welding, friction welding, etc.

2. Fusion welding: Fusion welding refers to the method of heating the weldment joint to a 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 with a lower melting point than the welded part as the solder, and heats the welded part and the solder to a temperature higher than the melting point of the solder but lower than the melting point of the welded part.

The state solder wets the object to be soldered, and diffuses with the object to be soldered to realize the connection.

Brazing can be divided into brazing and soldering according to the melting point of the solder used. Soldering using solder with a melting point higher than 4500C is called brazing; using solder with a melting point lower than 4500CThe welding is called soft soldering. The so-called "soldering" in the installation of electronic products is a kind of soldering, which mainly uses low melting point alloy materials such as tin and lead as solder, so it is commonly known as "soldering".Soldering"

Welding mechanism: The welding of electronic circuits seems to be simple, and it seems to be just the combination process of molten solder and the metal to be welded (base metal), but the microscopic mechanism is very complicated, which involves related knowledge such as physics, chemistry, materials science, and electricity. Familiar with the basic theory of welding, can know all kinds of problems in welding, deal with it easily,Thereby improving the welding quality of the solder joints.