1. Ferrofluidic Seal (Preferred for High Vacuum)
Typical applications:
High-vacuum systems such as electron beam welding and precision vacuum welding.
Characteristics:
Supports both rotational and linear motion
Extremely low leak rate, suitable for systems using diffusion pumps
Long service life with low friction and minimal particle generation
Limitations:
Not suitable for high-temperature environments
Sensitive to metal dust or debris, which can affect sealing performance
2. Bellows Seal (For Linear Motion Only)
Typical applications:
Welding cantilevers that move only in linear directions (e.g., vertical or horizontal extension).
Characteristics:
Hermetic sealing with virtually zero leakage
Excellent temperature and dust resistance
Simple structure and highly reliable
Limitations:
Allows linear motion only; cannot accommodate rotation
Stroke length is limited by the bellows design
3. Packing Seal / O-Ring Seal (Low Vacuum or Atmospheric Side)
Typical applications:
Rough vacuum systems or welding equipment that does not require high vacuum.
Characteristics:
Low cost and easy replacement
Widely used in non-critical sealing positions
Limitations:
Subject to wear and particle generation
Not suitable for high-vacuum environments
Can increase the risk of contamination, especially in systems using diffusion pumps
