Expansion Joint Fabrication Made Easy…. Metal Bellows Options
Bellows Design and Mfg. supplies metal bellows to expansion joint fabricators. In addition, we offer assistance with welding techniques, cost saving possibilities and time saving options. We can create bellows with features such as banded necks, resistance welded necks, and expanded necks to help your welders achieve success. If you require large dimension bellows, we can craft the equipment you need up to a diameter of 144”. also furnishes expanded to size flow liners, shroud cover kits, and vanstone stub ends. Browse the different bellows options for fabricators below.
Large Diameter Metal Bellows
With modular tooling, can manufacture large diameter metal bellows to fit your exact specifications. We are fully equipped to craft bellows up to a diameter of 144”. As with the smaller bellows, we can also make the larger diameters with multi-ply construction for increased cycle life and movement capability. High temperature T-321 stainless steel is our standard material of construction but T-316, T304, T309, T310, Hastelloy X, Hastelloy C276, Inconel 625 and other alloys can also be used in any of our metal bellows designs. To ensure that you get the large diameter metal bellows available, Bellows designs and manufactures ALL metal bellows in accordance with EJMA 10th edition.
Banded Necks
Reinforcing neck bands can be provided on the inside or outside of the bellows tangent. The band is used as a welding aid as well as reinforcement. The neck band functions as a heat sink for thin bellows materials and dramatically speeds up the welding process.
Resistance Welded Necks
Resistance welding, also known as roll seam welding, is a process of overlapping machine spot welds. Bellows offers this process on multi-ply bellows to join all of the plies together at the end of the necks thus making welding almost fool proof for the customer. Resistance welding can be done with or without a reinforcing band depending on the bellows ply thickness.
Expanded Necks
offers precision neck expansion on all of our single ply and multi-ply bellows. As experienced fabricators know, a better fit means easier and faster welding. When the neck fits tightly to the flange or pipe it is being welded to, the chances for leaks are greatly reduced.
Fitted Flow Liners
Flow liners can be ordered with the bellows and expanded to fit into the bellows neck. This method utilizes the flow liner as a weld band / welding aid. Fitted flow liners are a time saver because the bellows attachment and the liner attachment are done as one weld.
Weld-In Flow Liners
Weld in liners are designed to weld to the flange or pipe after the bellows attachment weld is made. Each flow liner is precision expanded for a tight fit thus reducing the weld time. Bellows offers single step expansion for standard clearance and double step expansion for larger clearances needed for lateral offset.
Fitted Vanstone Stub Ends
Vanstone stub ends are an economical way to make flanges floating, allowing them to rotate for precise bolt hole alignment. Bellows manufactures vanstones in a variety of alloys and thicknesses, and like liners they can be expanded to fit the bellows neck. Just remove the vanstone from the bellows, add the flange and re-install to weld. Vanstone stub ends are available in both single flare and our unique double flare design.
