How to Braze a Copper Pipe
If you need to braze a copper pipe, you can do the job yourself and don't need to call a handyman. The job is not a complicated or difficult one, with the right tools, materials and this set of instructions, you will be able to do the job yourself and save some money.
Step 1 – Preparing
The chemicals used in the process of brazing a copper pipe could be harmful to your skin. Use gloves to protect your hands.
Clean the pipe to remove existing dirt and other residue. It is best to use a chemical agent. This will easily rid the pipes of unwanted materials. After scraping the dirt off, make sure to wipe the surface clean. Be sure there are no chemicals that are left behind.
Step 2 – Sandpaper the Surface
Take the sandpaper and smooth the area you want to braze. Sandpaper the cut edges of your pipe and clean off the surplus copper particles from the pipe.
The interior of the fitting needs to be roughened up. You can use a brush, preferably a wire brush to do this and when you are done, use a rag to clean the fitting and get rid of all the dust.
Step 3 – Applying Flux
Flux has to be applied on the interior of the fitting. A flux is a chemical agent which helps to remove oxidation on the copper pipe while brazing. Use a normal paint brush for this purpose. The flux has to be coated on the ends of the copper pipe as well.
The coupling has to be inserted at the end of the copper pipe. Apply some flux to the place where both the pieces are joined.
Step 4 – Ignite the Acetylene Torch
Ignite the acetylene torch and let it burn for a couple of seconds, reduce the flame when you start the brazing process. Heat the surface evenly and quickly to get a good bond.
Move the torch lightly at the point where the flux is applied. The flame must be evenly applied to the surface, keep moving the flame in order to avoid burns or holes on the fitting.
Step 5 – Applying Solder
Apply sufficient heat to cause the solder to flow easily. Hold the solder to the hot copper pipe as it will melt and bond the copper pipes together. Ensure the solder goes around the copper pipe completely and should also flow into the spaces in the interior as well as exterior of the pipe.
After placing the solder, allow the pipe to cool. Do not attempt on trying to dry it with external agents. Let the pipe cool on its own. Once the pipe has cooled down, you can clean the surplus flux off with some warm water and a wire brush.