Step 9 · Cool and Clean the Finished Joint

After the solder has filled the joint, set the torch aside and allow the joint to cool undisturbed for several minutes. Do not move or bump the pipe. Quenching the hot joint with a wet rag can cause a stress fracture in the solder, creating a pinhole leak. Once the joint has air-cooled and is no longer hot to the touch, use a damp rag to wipe away all flux residue from the exterior of the pipe and fitting. Flux is an acid and will corrode the copper over time if not removed, leading to green staining and potential pipe failure.

Tools and Materials

TRIMACO 14 in. x 17 in. Microfiber Wonder Rags (50-pack) 83650WaterAMEREX 2-A:10-B:C 5 lbs. ABC Dry Chemical Fire Extinguisher B500TNexgrill Heat Resistant Grilling Gloves with Silicone Grip 530-0025NMCR Safety BearKat Safety Glasses MCSCRWBK110