What form is the flux used in Submerged Arc Welding?

In Submerged Arc Welding (SAW), the flux is used in powder form. This powdered flux plays a crucial role in the welding process, as it is designed to protect the molten weld pool from atmospheric contamination, thereby preventing oxidation and other undesirable reactions.

When the flux is applied during welding, it forms a slag that covers the molten metal. This slag not only shields the weld from contaminants but also helps to stabilize the arc and regulate the temperature, ensuring a smooth and consistent weld. The specific composition of the flux can also enhance the mechanical properties of the welded joint.

Choosing powdered flux over other forms allows for effective control over the weld quality and characteristics. Liquid flux, solid pellets, and vaporized states are not utilized in SAW due to their inability to provide the necessary protection and stabilization that powdered flux delivers effectively during the high-energy welding process.