What is the primary purpose of using flux in soldering?

The primary purpose of using flux in soldering is to chemically clean the surfaces. Flux helps to remove oxidation and impurities from the metal surfaces that are being joined, ensuring that the solder can flow easily and bond effectively. Without proper cleaning, oxidation can prevent the solder from adhering to the surfaces, leading to weak or faulty joints. By promoting a clean surface, flux enhances the ability of the solder to make a strong, reliable connection between components, which is critical for the longevity and integrity of the joint. Therefore, recognizing the importance of flux in preparing the metal surfaces is essential in pipe fitting and soldering processes.