Alloy bellows combine strength and elasticity
A
NiCoForm product story
Edited by the Engineeringtalk editorial team
Feb 16, 2005
Engineers in need of large bellows with a thin, leak-tight and highly elastic wall have a new option - electroformed nickel-cobalt alloy bellows.
Electroformed bellows have been traditionally used in precision applications where small diameters (less then 25mm outside diameter) and thin walls are essential.
Larger bellows are often produced by welding or hydroforming, but this limits their wall thickness to greater than about 127um and affects the components' performance as both processes compromise the materials mechanical properties.
With NiCoForm's development of the high strength NiColoy electroforming process, engineers in need of large bellows with a thin, leak-tight and highly elastic wall have a new option - electroformed nickel-cobalt alloy bellows.
Not only are they virtually stress-free while possessing high strength and elasticity, these components can be seamlessly joined to various components (such as flanges, manifolds, hubs etc) made out of conventional (steel, brass, copper) as well as exotic (titanium, Invar, Covar etc) materials.
A recently completed 8in outside diameter electroformed NiColoy bellows with integral stainless steel flanges withstands 6.9bar internal pressure with a wall thickness slightly under 152um.
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