Which method is NOT commonly used for joining pipes?

Welding is not commonly used for joining pipes in residential plumbing systems. While welding is an effective method for joining metal components, it requires specialized equipment and skills, making it less practical for plumbing applications compared to other methods.

On the other hand, soldering is frequently used, particularly for copper pipes. It involves melting a filler metal to create a strong, leak-proof joint. Solvent welding is widely employed with PVC and other plastic pipes, utilizing a chemical solvent to bond the materials together. Mechanical fittings are also popular, as they allow for easy assembly and disassembly using clamps or threads without the need for heat or adhesives. These methods are favored in plumbing for their efficiency, effectiveness, and ease of execution.