Seamless NiColoy® Bellows and Assemblies

Metal bellows are produced by rolling, welding, hydroforming and electroforming, but only electroformed bellows feature seamless construction and isotropic  properties, unaffected by the heat of welding or the strains of cold working.

Bellows are electroformed by electroplating metal onto a conductive mandrel (model) of the desired configuration. Mandrels are often machined out of Aluminum, which allows them to be chemically dissolved after electroforming, leaving behind a stress-free bellows, as shown in the illustration on the right.

Produced since the 1950-ies, Nickel bellows had a limited operating range of up to 175 °C (350°F). Such bellows, therefore, could not be reliably brazed or welded.  Additionally, to overcome the porosity of thin (<50 micron/.002") Nickel electrodeposits, a Copper lamina usually had to be plated halfway through the Nickel wall to assure the bellows' airtightness.

NiCoForm's goal, since inception, was an electroformable material free from the limitations of electrodeposited Nickel. The result was NiColoy^®, a trademarked family of Nickel-based engineering electrodeposits. Possessing improved mechanical and thermal properties, these alloys can be used over a wider temperature range (cryogenic up to 350 °C/660 ºF), and withstand higher stresses and strains without permanent deformation. NiColoy® bellows can be electrojoined, soldered, welded and brazed. Freedom from stress assures the material's reliable performance in extension, compression, bending and rotation. Non-porous and corrosion resistant, NiColoy® bellows require no Copper lamina to be Helium leakproof.
Today, electroformed NiColoy® bellows successfully replace their electrodeposited Nickel counterparts across the board, and are the only choice where the improved performance and greater consistency of NiColoy® are essential.

• NiCoForm's advanced mass-electroforming technology produces bellows with otherwise unattainable part-to-part consistency and reliable performance in extension, compression, bending and rotation
• NiColoy^® bellows can be produced with walls as thin as 0.0004” (10 µm), and diameters as low as 0.03” (0.75 mm) - much smaller than possible with alternate methods - making them ideal for precision sensing applications. On the opposite end of the spectrum lie electroformed bellows 10” (250 mm) in diameter and 25” (625 mm) long
• When specified, Copper, Silver, Gold, Rhodium and other coatings further increase the bellows' corrosion resistance  and improve their contact performance in electronics
  
• Leak testing of bellows is performed by helium mass spectrometry up to 10^-9 ccHe/sec
• NiColoy^® bellows can be hermetically attached to mating components by welding, brazing, soldering, electrojoining, and the use of adhesives

Whether you are supporting an existing product or develop a new application, our experts can help you design, optimize, prototype and manufacture your bellows in a timely, efficient and cost-effective fashion.

Please enter your project parameters into the form here, so we can assist with your bellows design.

At NiCoForm, there is no need to choose from a standard line of components - we custom engineer bellows to your specifications