How to Unsolder Copper Pipes | eHow
Soldered joints in copper pipe can be undone. Most homes use copper piping in their plumbing systems, built up from multiple sections of pipe. If you develop a leak in a copper pipe, it usually is possible to replace just the piece of pipe that is leaking and leave the sound plumbing around it intact. Soldered joints in copper plumbing may look permanent, but with some basic tools they can be disassembled and repaired relatively easily.