Metal bellows expansion joint, also known as expansion joint, is composed of metal bellows and components, mainly to ensure the safe operation of the pipeline. Metal bellows expansion joint is a flexible thin-walled transverse bellows device with expansion function. Metal bellows expansion joint has the functions of pressure resistance, sealing, corrosion resistance, temperature resistance, impact resistance, vibration and noise reduction. Metal bellows expansion joint can reduce the deformation of the pipeline and improve the service life of the pipeline.