Edge Welded Bellows for Seal, Anti-Vibration, Large Movement

• Customization: Available
• Material: Stainless Steel
• Temperature Classification: Medium Temperature Piping
• MPa Classfication: Low Pressure Piping
• Standard: ASTM, GB, API, DIN, JIS
• Medium: Gas
• Cross-Section Shape: Round
• Connection Type: Welding
• Diameter: DN100
• Transport Package: Steel Frame, Pallet, Wooden Box
• Specification: DN6-100
• Trademark: ZhiXing
• Origin: China
• Package Size: 10.00cm * 10.00cm * 5.00cm
• Package Gross Weight: 1.000kg

Product Description

Edge welded metal bellows are formed by microscopically welding the interior diameters of individual, stamped metal diaphragms into two-piece convolutions, then welding a series of those convolutions together on the outer diameters to form a welded bellows core. The bellows core can then be microscopically welded to end fittings corresponding to the final application.

We manufacture standard and custom edge-welded bellows that are designed to support critical applications. We offer:

• Proprietary stamping, cleaning and welding techniques for exceptional strength and consistency
• Individually inspecting diaphragms for the highest quality to ensure welds are the strongest and leak-tight
• Special handling to protect against contamination of the materials
• Deep penetrations and consistent weld bead geometry to ensure a leak-tight joint that can withstand high cycle applications
• Engineered for optimal performance with an internal vacuum or external pressure
• Optional heat treating to strengthen the material
• Helium leak testing to industry standards (1×10-9 for stainless steel material) to ensure the assembly is completely sealed.
• Lower leak rates are available as required

Our edge-welded metal bellows are typically manufactured from sheet stock. We offer various materials of construction to suit your application including:

• Stainless Steel (316L, 304L, 347)
• Inconel ( 625, 718)
• Hastelloy•(276C / Haynes 242)
• Titanium ( Grades 1 - 4) (ASTM_B265)

The steps of edge welded metal bellows production are similar regardless of the manufacturer. The individual processes conducted within those steps are unique to the manufacturer's design and in most cases, are proprietary.
In general, the process follows these steps:

1)Diaphragm plates (male and female) are stamped from rolls of foil stock.

2)These plates are ultrasonically cleaned and dried to remove oils and any other debris before they are sent to welding. This ensures the plates are optimally prepped for the next stage of production.

3)A bellows core is a series of convolutions which are created by welding one male diaphragm and one female diaphragm together on the inside diameter (ID). To create a bellows core, this process is repeated for multiple convolutions, and then those convolutions are welded together on the outer diameters (OD). At the point of OD welding, removable spacers and a welding arbor can be used to keep the core's convolutions stable and uniformly spaced. In the welding room, the most common types of bellows welding are Tungsten Inert Gas (TIG) or Plasma.

4)Once the welded unit of convolutions (bellows core) is complete, it is welded to end fittings to complete the final bellows assembly. It is then tested to check for any leakage at the weld points. The test is performed using water or gas, depending on the application specifications. If the final assembly receives an inserted face, the bellows unit is also tested after insertion to ensure a leak-tight seal.

 

Welded bellows have specific advantages, including:

• High strength with the ability to withstand high pressures
• Wide operating temperature range
• Precise design and performance characteristics
• Low spring rate (the amount of force required to compress the bellows a given distance)
• Low stress in critical areas
• Allow for optimal plate shape design―nesting ripple
• Only one moving part
• Static secondary seal

Edge-Welded Bellows Applications

Bellows Accumulators

Bellows Actuators

Lifter Bellows

Mechanical Feedthroughs

Mechanical Seals

Vibration Dampeners

Volume Compensators