How does active flux in submerged arc welding function?

Active flux in submerged arc welding serves an essential role by controlling the composition of the weld metal. When the flux is melted during the welding process, it interacts with the molten weld pool and can alter the chemical makeup of the deposited metal. This modification is significant because it allows for adjustments to mechanical properties, such as strength and ductility, and can also aid in preventing oxidation or other potential impurities in the weld metal.

The composition control provided by the active flux is crucial in achieving the desired characteristics for specific applications, enhancing the overall quality and integrity of the weld. By ensuring that the alloying elements and their proportions remain consistent, active flux contributes significantly to the performance of the welded joint.