Vacuum Technology Know How - Triumf

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Figure 6.7: Conflat ® flange connection
Glass connections
Vacuum systems for glass technology applications employ a glass or ground-in connection,
which is used only in connection with small nominal diameters. The connections, consisting
of the a tapered male ground joint and the corresponding female ground joint, are held together
by the ambient air pressure and are sealed with vacuum grease.
Portfolio
Pfeiffer Vacuum offers all popular standard flanges and other connection elements.
6.4 Non-detachable connections
Non-detachable connections in vacuum technology are achieved by welding, brazing or fusing,
or by metalizing or sintering with subsequent brazing. In recent years, vacuum-resistant
adhesives have also come into use to join components for applications that do not involve
UHV technology. The selected connection technology must be appropriately designed for
the major requirements with respect to mechanical strength, temperature and alternating
thermal loads, as well as the required gas-tightness. Material pairings such as metal-to-metal,
glass-to-glass, glass-to-metal, metal-to-ceramic and glass-to-ceramic are being used more or
less frequently in vacuum technology. Metals are most often joined by means of welding
and brazing. In glass equipment, the individual glass components are joined through fusion.
Non-detachable joints between metal and glass that are produced by fusing or metalizing
and fusing are less frequent, and joints between metal and ceramic, which are produced
by metalizing or sintering, are also less frequent.
Welded connections
In vacuum equipment, components of plain and stainless steel are usually welded together
for vessels and joints. In addition, it is also possible to weld aluminum components together.
To ensure that the welds that are produced are vacuum-tight, it is necessary to use proper
materials that are free of cracks and voids, and whose surfaces are smooth and free of grease.
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