Final Answer:
A technique for joining copper water pipes is called soldering.
Step-by-step explanation:
Soldering is a widely used technique for joining copper water pipes in plumbing applications. In this process, a filler material, typically a metal alloy with a lower melting point than the pipes, is heated and melted to form a bond between the copper surfaces. The solder wicks into the joint by capillary action, creating a secure and watertight connection. Soldering is chosen for its effectiveness, speed, and relatively simple application.
This technique is common in both residential and commercial plumbing installations. It is crucial to ensure that proper safety measures, such as adequate ventilation and protection against fire hazards, are observed when using the soldering technique in plumbing to maintain the integrity of the joint and overall plumbing system.