How to Solder Brass Plumbing

Brass plumbing, unlike modern PVC, must be soldered with a blow torch in order to make a firm, watertight connection. For most homeowners, it is worth calling a plumber if your brass plumbing requires solder. Soldering brass can be tricky: you must heat the surrounding pipe and fitting to a much higher temperature than other metals. The resulting connection will also be under a fair amount of pressure from the water, which makes a good connection essential. However, if you have some experience soldering and are comfortable tackling this project, knowing how to solder your own brass plumbing can save you significant money.

Keep in mind that you will need a blowtorch, heavy work gloves suitable for soldering and welding, and eye protection. You may want to purchase a few extra sections of pipe and practice your technique before working on the actual plumbing.

Step 1: Wipe the ends that you intend to solder with a rag to remove any surface grime. Then sand the inside and outside of both brass connections with plumber's sandpaper. The surface you uncover should be slightly shinier than the rest of the pipe.

Step 2: Thoroughly coat the areas where the solder will be with flux. Use a brush and be sure that you completely coat all areas with a generous coat.

Step 3: Fit the connection together, checking to make sure that the connection is correct for the plumbing you are installing or repairing.

Step 4: Start soldering by heating the area you intend to solder with the blowtorch. This process should take about 30 seconds. Then press the solder to the pipe, applying solder around the connection.

Step 5: Continue applying solder around the connection until the connection is made and and solder begins to drip. Remove the solder and turn off the blowtorch.

Step 6: Quickly, with your gloved hand holding a rag, remove any drips from the connection. If you have soldered the joint correctly, you should be able to turn on the water immediately. The connection should not drip and should withstand any water pressure in your plumbing system.