Soldering copper tubing may seem like a big deal, but it’s actually rather simple and easy enough for the average homeowner to get the deal done. The first thing you want to do is make sure that the plastic tubing cannot easily be moved when soldering. This means getting yourself a vise that can hold on the copper tubing without damaging it.
Use a Brillo pad to rube the exterior of the copper tubing. This will facilitate a better depth for fitting. You can your copper to be bright and shiny so therefore you need to remove oxides that can discolor the copper.
Copper tubing to soldered also should be clean inside. When you have finished cleaning the interior of the copper tubing, it’s time to apply flux. If you don’t know what flux is, don’t worry because by the time you finish soldering the copper tubing you most definitely will know what flux is. Oh, all right: flux is a substance that dissolves non-metallic oxide film on surfaces to be solder. If you don’t use flux, you’ll face problems with corrosion. Apply flux to the end of the tube using your fingers. Slide the fitting over the tube and give it a twist to ensure that you spread the flux evenly. Make sure you do not remove the fitting. Now it’s time for the fun part.
Light up your soldering torch and heat the tube and the fitting until the flux starts to bubble up. Give the edges of the fitting a touch with the wire solder. The solder should melt instantly around the joint if the heat is adequate. If the heat is not adequate for immediate melting, you should reheat the fitting and the tube. Wipe away the excess solder with a rag and rub the joint with that Brillo pad. Wrap the joint with a moistened rag before soldering other joints. This will prevent the first joint from melting as the heat spreads toward it while you are soldering other joints.
A really good tip when you are soldering copper pipe is to make sure that any existing pipes have been drained of water before you solder. Any water that exists inside the pipe can create steam that will foster an atmosphere in which the solder simply does not take. Avoid wasting your time if you can, but if you do run into trouble with steam, open a faucet close to allow the steam to pass through safely.