Which of the following is NOT a function of flux during welding?

In the context of welding, flux serves several important functions that enhance the welding process. One of the primary roles of flux is to break up oxides present on the surface of the metals being joined and facilitate their removal by allowing them to float to the top of the weld pool. This ensures a cleaner weld interface.

Another critical function of flux is to promote wetting action, which allows the molten filler metal to spread more uniformly across the surfaces being welded, contributing to better fusion of the materials.

Furthermore, flux prevents oxidation during the welding process by providing a protective barrier between the molten weld pool and the atmosphere. This is crucial because oxidation can weaken the weld and lead to defects.

However, enhancing weld strength is not a direct function of flux. While a clean and well-wetted weld can contribute to overall weld quality and strength, the flux itself does not inherently increase strength; rather, it ensures the conditions are optimal for a strong weld to be formed. Therefore, while enhancements in weld strength may result from using flux, it is not a function of flux in itself.