True or False: When brazing with a copper tube and wrought copper fittings, fluxing is optional.

When brazing with copper tube and wrought copper fittings, the use of flux is indeed essential, making the statement that fluxing is optional incorrect. Flux serves several important functions in the brazing process. It helps to clean the metal surfaces by removing oxides and impurities, which allows for better adhesion between the brazing filler material and the base metals. Also, it prevents oxidation during the heating process, which is crucial for achieving a strong joint.

In the absence of flux, the strength and durability of the brazed joint could be compromised due to potential gaps or weak points created by the presence of oxides. Therefore, it is always recommended to use flux when brazing copper regardless of the application. This ensures a proper bond and contributes to the overall integrity of the work.