How to Solder Copper Pipe

Soldering copper pipe is an essential technique in plumbing and pipe fitting projects, enabling the secure joining of copper pipes using a filler metal called solder. When executed accurately, a properly soldered joint guarantees a leak-free connection, safeguarding against water damage and potential hazards. This process demands precise measurements and the correct application of flux and heat to establish a robust and enduring bond between the pipes. Keep reading to learn how to properly solder copper pipe.

1. Measure and cut the copper pipe.

First, measure the copper pipe to the desired length and cut using a tube cutter. Make sure the pipe is cut square.

Deburr and clean the outside and inside of the pipe surface using a sand cloth, open mesh cloth, nylon grit pad or tube cleaning brush. Then, clean the inside of the fitting hubs with an Oatey fitting brush.

Note: The joining surfaces must be clean before soldering.

2. Apply flux.

Apply a light coating of Oatey Flux to the pipe end and fitting hub using an acid brush. Make sure to remove any excess product.

Note: Proper fluxing is important because the flux promotes the flow of the filler metal.

3. Connect pipe and fitting hub.

Insert the pipe end into the fitting.

4. Heat pipe joint.

Using a soldering torch, heat the pipe joint evenly until the solder flows.

Note: If close to combustible materials such as wood, use an Oatey Flame Protector.

Feed the wire solder into the joint. When the solder wire has drawn around the entire joint, remove the heat.

Disclaimer: Too much heat and flux will cause excess solder flow or flux to burn out.

5. Allow joint to cool.

When soldering process is complete, allow the joint to cool undisturbed.

Finally, when the joint is cooled down but still warm, remove any flux residual and wipe it clean with a clean and dry rag.