What is flux used for when soldering copper pipe?

Helps solder flow and bond to the metal.

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  1. Seals threads on a fitting
  2. Helps solder flow and bond to the metal ✔
  3. Cools the pipe after heating

Why: Flux cleans the metal and helps solder flow into the joint for a strong bond.

Huh, didn't know that: Flux cleans the metal and helps solder flow into the joint for a strong bond.

The dad joke
Flux helps solder go with the flow.
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References

Answer: Helps solder flow and bond to the metal. Flux cleans the metal and helps solder flow into the joint for a strong bond.

  1. Scouting America: Plumbing www.scouting.org/merit-badges/plumbing
    Identify and explain the following terms: washer, retaining nut, plunger (rubber force cup), solder, flux, elbow, tee, nipple, coupling, plug, union, trap
    Checked 2026-11-07.

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