What is the purpose of flux in welding?

In welding, the primary purpose of flux is to prevent the formation of new oxidation by creating a protective barrier around the molten weld pool. When metals are heated, they can react with oxygen and moisture in the air, which can lead to oxidation and contamination of the weld. Flux helps to cover the area being welded, displacing harmful elements and preventing them from interfering with the bonding process of the metals. This results in a cleaner and stronger weld joint.

While other roles are associated with various welding processes, such as providing additional heat or stabilizing the flame, they do not capture the main function of flux as effectively as its role in oxidation prevention. Ensuring that the weld area is free from oxidation is crucial for achieving a high-quality weld, making the use of flux essential in many welding operations.