Bimetal Al/SS Tube & Pipe Fittings

Atlas bimetallic transition fittings enable the direct coupling of dissimilar metal tubes and pipes. The fittings are used in cryogenic lines, aerospace and other thermal transfer applications where contrasting heat transfer is needed. 

Engineered to withstand typical welding temperatures and bonded to minimize porosity and maximize strength, the fittings are suitable for use in Ultra High Vacuum (UHV). They are also used in nonmagnetic and nuclear applications where the properties of one metal must be reliably switched to that of another. 

Bonds of some custom materials are suitable for operation with liquid helium but a minimum wall thickness of 0.30” must be maintained. Please consult with Atlas engineering for specific guidance.

Applications:

• Cryogenics feed lines
• Ultra-high vacuum
• Aerospace
• Energy
• Oil and gas
• Nuclear environments
• Non-magnetic environments

Features & Specifications 

• Available in all standard sizes, wall thicknesses, and schedules 
• Standard tube fitting sizes: 0.25”, 0.375”, 0.5”, 0.75”, 1”, 1.25”, 1.5”, 2”, 2.5”, 3” 4” (DN6 to DN100)
• Custom sizes and materials available

Materials

• Standard: Al/SS (Aluminum 6061 / 316L Stainless)
• Custom options (contact us for more information): 
• Al/Ti (Aluminum 6061/ Titanium CP Gr2)
• Al/Cu (Aluminum 6061/ C101 Copper)
• Ti/SS (Titanium CP Gr2/ 316L Stainless)
• Cu/SS (C101 Copper/ 316L Stainless)

Weld Configurations:

• Butt weld prep
• Socket weld prep
• Male weld prep

Pipe Schedule Configurations:

• Schedule 10
• Schedule 40
• Schedule 80

Environmental

• Vacuum Rated to 1 x 10-9 Torr (all bonds are vacuum tested) 
• Pressure testing and certification up to 400 psi is available

Thermal

• Bakeout Temperature: 300°C 
• Peak Temperature: 300°C (during weld-up)
• Operational Temperature Al/SS -200°C to 250°C, custom options - 4000K to 250°C (depending on metal combination) 

Mechanical - Bonded Interface

• Tensile: 15,00psi (103MPa)
• Shear: 10,000psi (69MPa)