What is one of the functions of flux in a welding scenario?

In welding, flux serves several essential functions, and one of its primary roles is to break up oxides and float them to the top of the joint. Oxides can form on the surface of metals being welded, which can impede proper fusion and lead to weak welds. The flux creates a protective environment that helps to eliminate these impurities by chemically reacting with them, thus ensuring a cleaner weld joint.

This process helps achieve a strong bond between the metal pieces being joined, as it facilitates better penetration and adhesion of the molten filler material. This is critical because any contaminants that are not removed can lead to defects such as porosity or cracks in the weld, significantly affecting the structural integrity of the finished product.

Other functions of flux include providing a protective barrier against atmospheric gases and controlling the cooling rate of the weld, which are important but secondary to its role in managing oxides during the welding process.