- 1). Clean the outside of the fittings with fine emery paper. Clean the interior of fittings with a small, round wire brush. Clean them until they shine. Remove grease, dirt or oxidation. Solder will not stick to dirty pipes.
- 2). Apply a thin coating of flux to the joints to be soldered and fit them together in the position you want them. Make sure they slide easily into position and fit properly.
- 3). Light your torch and adjust the flame to about 1.5 inches.
- 4). Heat your coupling with the torch for about 8 to 10 seconds. Move the torch around the fitting to heat it evenly.
- 5). Touch the solder to the joint at the top or the highest point. When the joint is hot enough, the solder will "sweat" into the joint all by itself, in a process called capillary action. Do not try to melt the solder with the torch. If the solder does not melt at first, keep heating the coupling until it does.
- 6). When solder strarts to drip out of the bottom of the joint, pull away the torch and solder and quickly wipe the joint clean with a rag. Be careful because the pipe will be very hot.
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