Step 9 · Cool and Clean the Joint
Allow the joint to cool undisturbed for several minutes. Do not move or stress the joint while the solder is solidifying. Quenching the joint with water can stress the metal and cause a hairline fracture, leading to a leak. Once the joint has air-cooled enough to be safely touched, use a damp rag to wipe away any remaining flux residue from the outside of the pipe and fitting. This is important because flux is acidic and can cause corrosion over time.