What must not be done to pipe ends when preparing them?

When preparing pipe ends for joining, it is crucial that the ends are not undercut. Undercutting refers to the process where a portion of the pipe end is removed or reduced in thickness, which can compromise the quality and integrity of the joint. A proper joint requires that the surface of the pipe end maintains its original thickness to support a strong bond, whether it be through welding, soldering, or another joining method.

Undercutting can lead to weak spots in the joint, increasing the likelihood of leaks or failures over time. Therefore, ensuring that pipe ends are free from any undercuts is essential for maintaining structural integrity and ensuring the reliability of plumbing, heating, and cooling systems.

Cleaning, chamfering, and polishing the pipe ends are standard practices to prepare them for effective joining, as these processes help create a smooth surface that enhances the capability of achieving a secure connection.