Glossary
Press, shrink, and cryogenic fittings

autofrettage ; autofrettage

The technique of applying an internal hydrostatic pressure in excess of the elastic limit at the bore to a single- or multi-block cylindrical tube or enclosure, causing plastic flow in an annular zone, in order to create a radial pressure between this zone and the elastically deformed zone which acts in a similar way to a shrink-fit pressure.

wedging ; wedging

The process used to create the clamping; it can be either press-fitting (to force the core into the shrink disc by means of a press), hot-fitting (to expand the shrink disc by heating in an oven, in a hot oil bath or by induction), or cold-fitting (to shrink the core to be shrunk by cooling with liquid air or liquid nitrogen), or even a combination of two of these processes.

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