Edge-Welded Metal Bellows
Edge-Welded Metal Bellows are special type of metal bellows. It is formed by multiple stamped thin metal diaphragms that are alternately welded at their inner and outer edges, creating a unified, flexible, and tubular assembly.
Core Features and Advantages
Compared to other types of bellows, edge-welded bellows offer:
- Ultra-Long Fatigue Life: Uniform stress distribution across the convolutions allows them to withstand an extremely high number of reciprocating cycles (capable of reaching millions to tens of millions).
- Precise Elastic Characteristics: Stiffness and elasticity are very stable, providing accurate force-displacement relationships.
- Zero-Leakage Absolute Sealing: The all-metal welded construction achieves complete sealing, eliminating any risk of leakage.
- Resistance to Extreme Environments: Ability to use different metal materials (e.g., stainless steel, Hastelloy, Inconel) to withstand high temperatures, cryogenic temperatures, corrosion, and radiation.
- High Stability: Its effective length remains almost unchanged during compression and extension, making it particularly suitable for applications requiring precise axial movement.
Main Application Areas
Based on the above features, the core applications of edge-welded metal bellows are primarily focused on areas requiring the transmission of motion into a sealed space or demanding long-life, zero-leakage sealing in harsh environments.
- Ultra-High Vacuum Systems: Serve as movable flexible connectors for linking components requiring relative movement (e.g., between turbomolecular pumps and chambers), maintaining the system's ultimate vacuum.
- Synchrotron Radiation, Particle Accelerators: Used in beamlines and vacuum systems to compensate for installation errors and thermal displacement.
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