In order to make the joints of copper pipes leak-proof, you need to “sweat” the pipe. This process consists of thoroughly cleaning the pipes, then exposing them to a heating element, like a blowtorch. When attempting this, be sure to wear gloves and hang flame protectors over exposed wood or textiles. Using a blow torch, heat the joints thoroughly, then press the joint to encourage the seal. Next, melt a solder to the joint. If done correctly, the joint will now be leak-proof.
Key Takeaways:
- Examine inside all cut copper pipes to ensure that the burr (a ridge of copper shards caused by the saw where the cut was made) has been removed, to allow unimpeded water flow once the joints are sweated.
- Don insulated work gloves for protection against the acid in the flux. Apply a thin, even layer of tinning or plumbing flux to the newly cleaned sections of the exterior and interior of the copper pipes with an acid or flux brush.
- Wearing your insulated gloves, push the connecting pieces together until fully sealed (or as far as they’ll go). Twist the copper pipes slightly to distribute flux evenly inside the joint. Wipe off excess flux with a clean rag.
“For DIYers eager to take on plumbing tasks, one of the most important skills to master is how to sweat copper pipe—a process commonly referred to as soldering—in order to achieve leak-proof joints.”
