When welding electronic circuit components, the main function of flux is to help remove oxides, sulfides, oil and other pollutants on the metal surface, so that the solder can be better wetted and spread, thereby improving the reliability and quality of welding.
Specifically, flux can play the following roles:
1. Remove oxides from the metal surface: The metal surface is easily oxidized in the air, forming an oxide film, which will affect the wetting and spreading of the solder. The chemicals in the flux can react with the oxides on the metal surface and break them down into gases or soluble substances, thereby clearing the oxides from the metal surface and allowing the solder to wet and spread better.
2. Reduce the surface tension of the solder: The surface tension of the solder affects its ability to wet and spread. Chemicals in flux reduce the surface tension of the solder, making it easier to wet and spread.
3. Protect metal surface: During the welding process, flux can protect the metal surface from harmful substances such as oxygen and moisture in the air, thereby maintaining its good electrical and thermal conductivity.
4. Increase the fluidity of solder: Flux can make the solder flow better, thereby better filling the gaps and grooves on the metal surface, improving the reliability and quality of welding.
In short, when welding electronic circuit components, the role of flux is very important. It can improve the reliability and quality of welding and ensure the performance and life of electronic products.