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Household plumbing used to be mostly made of cast-iron. But now, carpenters use many types of metals and plastics for piping, including brass, copper, galvanized steel, acrylonitrile butadiene styrene, chlorinated polyvinyl chloride, polybutylene, and polyvinyl chloride. Joining these pipes underneath, and through you home, allows water to run to and from your home.

One of the most common types of piping is copper. If you are doing any home repairs, you will need to know how to solder copper pipe. Here are steps to get the job done.

1. Clean inside the pipe.

The first thing you need to do is make sure the pipe fitting is clean and clear. Take a small wire brush, or an emery cloth, and brush the inside until it shines.

2. Clean outside the pipe.

Next, clean the outside of the pipe, the piece of pipe that will go into the fitting. You can use the same emery cloth you did for the fitting pipe. Hold one side of the pipe, and clean the surface. Make sure you do not re-touch the clean portions.

3. Apply paste.

Now take a brush, and apply the paste flux on the outside of the pipe. Brush on a thin coating all around the pipe.

4. Insert pipe.

Then, take the pipe and place it into the fitting. Give the joint a half turn to spread the paste around. Then, wipe off any excess.

5. Heat joint.

Take a propane torch, and set it for a soft flame. Put the torch near the joined area, and move it around. Continue this until the pipe gets hot enough to melt; then turn it off.

6. Solder joint.

Touch the solder to the joint and move it around until a thin bead of solder forms around the entire joint rim. Do not apply too much, and wipe off the excess. Now you have a pipe, ready to use.

7. Repeat.

Most likely the joint has two sides. You will need to repeat steps one through six with another piece of pipe. Do this as many times as needed to get the desired shape or length you need.