When preparing a joint to be soldered, flux is put on which surfaces?

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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 preparing a joint to be soldered, flux is put on which surfaces?

Explanation:
Flux cleans and protects the metal surfaces so solder can wet them and flow into the joint. For a copper tube joint, you want flux on the surfaces that the solder will contact: the outside of the tubing and the inside of the fitting. This setup keeps those surfaces free from oxidation and allows solder to be drawn into the joint by capillary action, creating a solid, watertight seal. If flux isn’t applied to these areas, oxidation can form a barrier to wetting, and the joint may leak or fail to fill properly.

Flux cleans and protects the metal surfaces so solder can wet them and flow into the joint. For a copper tube joint, you want flux on the surfaces that the solder will contact: the outside of the tubing and the inside of the fitting. This setup keeps those surfaces free from oxidation and allows solder to be drawn into the joint by capillary action, creating a solid, watertight seal. If flux isn’t applied to these areas, oxidation can form a barrier to wetting, and the joint may leak or fail to fill properly.

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