What is a characteristic feature of a bell-and-spigot joint in piping systems?

A bell-and-spigot joint is designed specifically to facilitate the expansion and contraction of pipes within a piping system. This feature is critical because as temperature changes, materials can expand or contract, potentially leading to stress and damage within the connections. The bell-and-spigot design allows the spigot end of one pipe to fit into the bell end of another, creating a flexible connection that can absorb some movement without compromising the integrity of the joint.

The other options do not align with the fundamental characteristics of a bell-and-spigot joint. While welding techniques are important for various types of joints, they are not relevant to bell-and-spigot joints, which typically rely on mechanical fitting rather than welding. The joint is not specifically designed for easy removal; rather, it aims to create a secure and tight seal that can handle various forces. Lastly, bell-and-spigot joints are used primarily for fluid transport in pipelines, not for electrical connections, which would typically utilize different types of joints and connectors.