What is the term for the process of expanding tubes into a tube sheet?

The process of expanding tubes into a tube sheet is referred to as rolling. This technique is crucial in the assembly of heat exchangers and condensers, where tubes need to be securely attached to a tube sheet to create a reliable and efficient flow path for fluids. During this process, the tube ends are physically rolled or deformed outward against the tube sheet, resulting in a tight fit that prevents leaks and maintains optimal heat transfer. Rolling ensures a strong mechanical bond, allowing the heat exchanger to operate efficiently under pressure and temperature conditions.

The other terms in the question refer to different processes in metalwork and do not apply to the specific context of expanding tubes into a tube sheet. For example, beading, flaring, and peening refer to various methods of shaping or strengthening metal but do not achieve the same connection as rolling does in this scenario. Therefore, rolling is correctly identified as the term that matches the described process.