Why Metal Bellows Expansion Joints Are Essential for Industrial Piping A metal bellows expansion joint is a flexible metallic component installed within a piping system to absorb dimensional changes caused by temperature swings, pressure fluctuations, or mechanical vibration. The bellows itself is typically made from thin-walled, corrugated metal that can compress, extend, or flex laterally without transferring stress to the rest of the pipeline. https://afsjoints.livejournal.com/2394.html?newpost=1