Which of the following is necessary to ensure a proper fit for silver brazing?

Ensuring a proper fit for silver brazing primarily involves measuring and determining the clearance between the parts to be joined. This is crucial because a correct fit allows the filler material to flow properly into the joint during the brazing process, promoting a strong and effective bond. If the clearance is too small, there may not be enough space for the filler material, which can lead to inadequate penetration and strength. Conversely, if the clearance is too large, the filler may not adequately fill the gap, resulting in weaknesses.

While cleaning surfaces, applying flux, and adjusting the flame are important steps in the brazing process, none of them directly address the compatibility and fitting of the parts being joined. Proper measurement and fit set the foundation for all subsequent steps in brazing to ensure that the joint will function effectively.