When brazing copper with a phosphorus brazing rod, which condition is avoided by using no flux?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

When brazing copper with a phosphorus brazing rod, which condition is avoided by using no flux?

Explanation:
Fluxless brazing with a phosphorus-containing rod relies on the phosphorus to chemically clean and deoxidize the copper surface as it heats. Copper tends to form oxide films that block wetting and bonding, so normally flux is needed to dissolve those oxides and protect the surface. The phosphorus in the rod acts as a deoxidizer and helps the filler flow and bond without any added flux, meaning the copper surface is kept free of oxide during the process. So, using a phosphorus brazing rod without flux avoids the oxidation of the copper surface.

Fluxless brazing with a phosphorus-containing rod relies on the phosphorus to chemically clean and deoxidize the copper surface as it heats. Copper tends to form oxide films that block wetting and bonding, so normally flux is needed to dissolve those oxides and protect the surface. The phosphorus in the rod acts as a deoxidizer and helps the filler flow and bond without any added flux, meaning the copper surface is kept free of oxide during the process. So, using a phosphorus brazing rod without flux avoids the oxidation of the copper surface.

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