Applying Flux – How to Get Rid of Toilet Water Hammering Part 4
We've covered the importance of dry pipes and clean surfaces for successful copper soldering. Now, let's introduce another crucial element: flux.
Flux is a chemical compound that plays a vital role in achieving strong, leak-free solder joints. Even with meticulously cleaned pipes, flux is essential for optimizing the soldering process.
Here's how flux contributes to successful copper soldering:
1. Removes Remaining Oxides: Despite thorough brushing, some microscopic oxide layers may persist on the copper surface. Flux acts as a cleaning agent, dissolving these remaining oxides at elevated temperatures. This ensures pristine copper for the solder to bond with.
2. Improves Wetting: Flux reduces the surface tension of the molten solder. This allows the solder to spread more easily and evenly over the copper, creating a stronger bond and preventing voids or gaps in the joint.
3. Prevents Oxidation During Heating: As you heat the copper with a torch, flux creates a protective barrier that prevents further oxidation from occurring. This ensures a clean and oxide-free surface throughout the soldering process.
4. Enhances Capillary Action: Flux improves the capillary action of the molten solder, drawing it into the joint and ensuring complete filling of the gap between the pipe and fitting. This results in a stronger, more reliable connection.
Types of Flux
Acid-based flux: Used for general plumbing with copper pipes.
Rosin-based flux: Typically used for electrical work, not suitable for plumbing.
Water-soluble flux: Easy to clean up after soldering.
How to Apply Flux
Apply to both surfaces: Apply a thin, even layer of flux to both the pipe and the fitting where they will be joined.
Don't over-apply: A little goes a long way. Too much flux can hinder the soldering process and create a messy cleanup.
Heat the joint: Heat the joint evenly until the flux melts and becomes shiny. This indicates the copper is ready for the solder.
