What is one of the main reasons for using flux in welding?

One of the primary functions of flux in welding is to improve the quality of the weld joint. Flux serves several important roles during the welding process. It helps to eliminate impurities from the base metals and the filler material by creating a protective barrier that prevents oxidation. This ability to remove oxides and contaminants ensures a cleaner, stronger bond between the materials being joined, leading to a more durable weld.

Additionally, flux can help regulate the cooling and solidification of the weld pool, resulting in a finer microstructure in the weld metal. This leads to improved mechanical properties, such as strength and ductility, enhancing the overall integrity of the weld joint. Therefore, using flux is essential for achieving high-quality welds that meet required performance standards.