What is a common method of joining copper pipes?

Soldering or crimping is a common and effective method for joining copper pipes, making it the correct choice.

Soldering involves melting a filler metal, usually consisting of a tin-lead or lead-free alloy, to bond the copper pipes together. This creates a strong watertight seal that is ideal for plumbing applications. The process of soldering involves cleaning the surfaces of the copper pipe, applying flux to prevent oxidation, and then heating the joint with a torch before adding the solder.

Crimping, on the other hand, is a mechanical method that involves using a crimping tool to deform a fitting over the pipe, creating a secure and reliable connection without the need for heat. This method is especially popular in situations where soldering might be impractical or when working in tight spaces.

Both methods are widely accepted and used among professionals in the field, catering to various installation scenarios and preferences. In contrast, welding is generally not used for copper pipes due to the high temperatures involved, which can damage the metal. Screwing involves threaded connections, which are not as common for copper pipes, and gluing is typically used for plastic piping systems rather than metals like copper.