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Standard Tube and Pipe Bimetallic (Al/SS) Transition Couplings

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Atlas bimetallic transition couplings are robust, metallurgically-bonded dissimilar metal joints used to weld dissimilar metal tubes or pipes. These high strength joints are reliable and engineered to withstand typical welding temperatures. They are hermetic and suitable for use in Ultra High Vacuum (UHV) and are used in thousands of cryogenic and industrial applications worldwide.

Applications:

Our bimetallic couplings enable the direct coupling of dissimilar metal tubes and pipes with different thermal conductivities (e.g. copper to stainless steel). These fittings are used extensively in cryogenic lines and other thermal transfer applications where contrasting heat transfer is needed. They are also used in nonmagnetic and nuclear applications where the properties of one metal must be reliably switched to that of another.

For robust, demountable hermetic transitions for aluminum, copper or titanium, see our ATCR fittings page and our Bimetallic Atlas CF flange pages.

Bonding Process:

Due to our use of proprietary interlayers in our explosion welding process, our bimetallic joints are fully metallurgically compatible. They are bonded with a low-diffusion method that minimizes porosity and maximizes strength.

Our bimetal tube and pipe transition couplings are available in all standard sizes, wall thicknesses, and schedules ranging from ⅜” to 40″ diameter (DN10 to DN750). Pressure testing and certification up to 400 psi is offered.

Available Materials Combinations:

  • AS (Aluminum 6061/(interlayers: Titanium /Copper)/ 316L Stainless)
  • AT (Aluminum 6061/ Titanium CP Gr2)
  • AC (Aluminum 6061/ C101 Copper)
  • TS (Titanium CP Gr. 2/ 316L Stainless)
  • CS (C101 Copper/ 316L Stainless)

Nearly any combination of metals are available. Ask us for more information!

Weld Configuration:

  • BW (Butt weld prep)
  • SW (Socket weld prep)
  • MW (Male weld prep)

Pipe Schedule Configurations:

  • Schedule 10
  • Schedule 40
  • Schedule 80

Pressure Test Certification:

  • N (not pressure tested or certified)
  • Q (pressure tested and certified to 400 psi)

Specifications Environmental

  • Vacuum Rated to 1 x 10-9 Torr (all bonds are vacuum tested)

Thermal

  • Bakeout Temperature: 300°C
  • Operational Temperature from 4K to 250°C (depending on the metal combination)

Diagrams & Variations

Size Size Code Pressure OD (D) ID (A) Shank OD (B) Length (C) Part Number Files Actions
1/4" DN 6 Not Qualified .375" .125" .375" 1.50" TTBI-AS-BW0025-N
Add
1/4" DN 6 Qualified .375" .125" .375" 1.50" TTBI-AS-BW0025-Q
Add
3/8" DN 10 Qualified .625" .25" .625" 1.50" TTBI-AS-BW0038-Q
Add
3/8" DN 10 Not Qualified .625" .25" .625" 1.50" TTBI-AS-BW0038-N
Add
1/2" DN 12 Qualified .625" .375" .625" 1.50" TTBI-AS-BW0050-Q
Add
1/2" DN 15 Not Qualified .625" .375" .625" 1.50" TTBI-AS-BW0050-N
Add
3/4" DN 19 Qualified .91" .625" .91" 1.50" TTBI-AS-BW0075-Q
Add
3/4" DN 19 Not Qualified .91" .625" .91" 1.50" TTBI-AS-BW0075-N
Add
1" DN 25 Qualified 1.25" .75" 1.25" 1.50" TTBI-AS-BW0100-Q
Add
1" DN 25 Not Qualified 1.25" .75" 1.25" 1.50" TTBI-AS-BW0100-N
Add
1 1/4" DN 32 Qualified 1.50" 1.00" 1.50" 1.50" TTBI-AS-BW0125-Q
Add
1 1/4" DN 32 Not Qualified 1.50" 1.00" 1.50" 1.50" TTBI-AS-BW0125-N
Add
1 1/2" DN 40 Qualified 1.75" 1.25" 1.85" 1.50" TTBI-AS-BW0150-Q
Add
1 1/2" DN 40 Not Qualified 1.75" 1.25" 1.85" 1.50" TTBI-AS-BW0150-N
Add
2" DN 50 Qualified 2.25" 1.75" 2.55" 1.50" TTBI-AS-BW0200-Q
Add
2" DN 50 Not Qualified 2.25" 1.75" 2.55" 1.50" TTBI-AS-BW0200-N
Add
2 1/2" DN 63 Qualified 2.75" 2.25" 3.25" 1.50" TTBI-AS-BW0250-Q
Add
2 1/2" DN 63 Not Qualified 2.75" 2.25" 3.25" 1.50" TTBI-AS-BW0250-N
Add
3" DN 80 Qualified 3.25" 2.75" 4.00" 1.50" TTBI-AS-BW0300-Q
Add
3" DN 80 Not Qualified 3.25" 2.75" 4.00" 1.50" TTBI-AS-BW0300-N
Add
4" DN 100 Qualified 4.25" 3.75" 5.45" 1.50" TTBI-AS-BW0400-Q
Add
4" DN 100 Not Qualified 4.25" 3.75" 5.45" 1.50" TTBI-AS-BW0400-N
Add
Size Size Code Pressure OD (D) ID (A) Shank OD (B) Length (C) Tube OD (G) Al Tube Length (E) SS Tube Length (F) Part Number Files Actions
1/4" DN 6 Qualified .375" .125" .375" 1.50" 0.24" .40" 0.10" TTBI-AS-MW0025-Q
Add
1/4" DN 6 Not Qualified .375" .125" .375" 1.50" 0.24" .40" 0.10" TTBI-AS-MW0025-N
Add
3/8" DN 10 Qualified .625" .25" .625" 1.50" 0.37" .40" 0.10" TTBI-AS-MW0038-Q
Add
3/8" DN 10 Not Qualified .625" .25" .625" 1.50" 0.37" .40" 0.10" TTBI-AS-MW0038-N
Add
1/2" DN 12 Qualified .625" .375" .625" 1.50" 0.49" .40" 0.10" TTBI-AS-MW0050-Q
Add
1/2" DN 15 Not Qualified .625" .375" .625" 1.50" 0.49" .40" 0.10" TTBI-AS-MW0050-N
Add
3/4" DN 19 Qualified .91" .625" .91" 1.50" 0.74" .40" 0.10" TTBI-AS-MW0075-Q
Add
3/4" DN 19 Not Qualified .91" .625" .91" 1.50" 0.74" .40" 0.10" TTBI-AS-MW0075-N
Add
1" DN 25 Qualified 1.25" .75" 1.25" 1.50" 0.99" .40" 0.10" TTBI-AS-MW0100-Q
Add
1" DN 25 Not Qualified 1.25" .75" 1.25" 1.50" 0.99" .40" 0.10" TTBI-AS-MW0100-N
Add
1 1/4" DN 32 Qualified 1.50" 1.00" 1.50" 1.50" 1.24" .40" 0.10" TTBI-AS-MW0125-Q
Add
1 1/4" DN 32 Not Qualified 1.50" 1.00" 1.50" 1.50" 1.24" .40" 0.10" TTBI-AS-MW0125-N
Add
1 1/2" DN 40 Qualified 1.75" 1.25" 1.85" 1.50" 1.49" .40" 0.10" TTBI-AS-MW0150-Q
Add
1 1/2" DN 40 Not Qualified 1.75" 1.25" 1.85" 1.50" 1.49" .40" 0.10" TTBI-AS-MW0150-N
Add
2" DN 50 Qualified 2.25" 1.75" 2.55" 1.50" 1.99" .40" 0.08" TTBI-AS-MW0200-Q
Add
2" DN 50 Not Qualified 2.25" 1.75" 2.55" 1.50" 1.99" .40" 0.08" TTBI-AS-MW0200-N
Add
2 1/2" DN 63 Qualified 2.75" 2.25" 3.25" 1.50" 2.49" .40" 0.08" TTBI-AS-MW0250-Q
Add
2 1/2" DN 63 Not Qualified 2.75" 2.25" 3.25" 1.50" 2.49" .40" 0.08" TTBI-AS-MW0250-N
Add
3" DN 80 Qualified 3.25" 2.75" 4.00" 1.50" 2.99" .40" 0.08" TTBI-AS-MW0300-Q
Add
3" DN 80 Not Qualified 3.25" 2.75" 4.00" 1.50" 2.99" .40" 0.08" TTBI-AS-MW0300-N
Add
4" DN 100 Qualified 4.25" 3.75" 5.45" 1.50" 3.99" .40" 0.08" TTBI-AS-MW0400-Q
Add
4" DN 100 Not Qualified 4.25" 3.75" 5.45" 1.50" 3.99" .40" 0.08" TTBI-AS-MW0400-N
Add
Size Size Code Pressure OD (D) ID (A) Shank OD (B) Length (C) Socket ID (G) Al Socket Depth (E) SS Socket Depth (F) Part Number Files Actions
1/4" DN 6 Qualified .375" .125" .375" 1.50" 0.26" .40" .20" TTBI-AS-SW0025-Q
Add
1/4" DN 6 Not Qualified .375" .125" .375" 1.50" 0.26" .40" .20" TTBI-AS-SW0025-N
Add
3/8" DN 10 Qualified .625" .25" .625" 1.50" 0.38" .40" .20" TTBI-AS-SW0038-Q
Add
3/8" DN 10 Not Qualified .625" .25" .625" 1.50" 0.38" .40" .20" TTBI-AS-SW0038-N
Add
1/2" DN 12 Qualified .625" .375" .625" 1.50" 0.51" .40" .20" TTBI-AS-SW0050-Q
Add
1/2" DN 15 Not Qualified .625" .375" .625" 1.50" 0.51" .40" .20" TTBI-AS-SW0050-N
Add
3/4" DN 19 Qualified .91" .625" .91" 1.50" 0.76" .40" .20" TTBI-AS-SW0075-Q
Add
3/4" DN 19 Not Qualified .91" .625" .91" 1.50" 0.76" .40" .20" TTBI-AS-SW0075-N
Add
1" DN 25 Qualified 1.25" .75" 1.25" 1.50" 1.01" .40" .20" TTBI-AS-SW0100-Q
Add
1" DN 25 Not Qualified 1.25" .75" 1.25" 1.50" 1.01" .40" .20" TTBI-AS-SW0100-N
Add
1 1/4" DN 32 Qualified 1.50" 1.00" 1.50" 1.50" 1.26" .40" .20" TTBI-AS-SW0125-Q
Add
1 1/4" DN 32 Not Qualified 1.50" 1.00" 1.50" 1.50" 1.26" .40" .20" TTBI-AS-SW0125-N
Add
1 1/2" DN 40 Qualified 1.75" 1.25" 1.85" 1.50" 1.51" .40" .20" TTBI-AS-SW0150-Q
Add
1 1/2" DN 40 Not Qualified 1.75" 1.25" 1.85" 1.50" 1.51" .40" .20" TTBI-AS-SW0150-N
Add
2" DN 50 Qualified 2.25" 1.75" 2.55" 1.50" 2.01" .40" .20" TTBI-AS-SW0200-Q
Add
2" DN 50 Not Qualified 2.25" 1.75" 2.55" 1.50" 2.01" .40" .20" TTBI-AS-SW0200-N
Add
2 1/2" DN 63 Qualified 2.75" 2.25" 3.25" 1.50" 2.51" .40" .20" TTBI-AS-SW0250-Q
Add
2 1/2" DN 63 Not Qualified 2.75" 2.25" 3.25" 1.50" 2.51" .40" .20" TTBI-AS-SW0250-N
Add
3" DN 80 Qualified 3.25" 2.75" 4.00" 1.50" 3.01" .40" .20" TTBI-AS-SW0300-Q
Add
3" DN 80 Not Qualified 3.25" 2.75" 4.00" 1.50" 3.01" .40" .20" TTBI-AS-SW0300-N
Add
4" DN 100 Qualified 4.25" 3.75" 5.45" 1.50" 4.01" .40" .20" TTBI-AS-SW0400-Q
Add
4" DN 100 Not Qualified 4.25" 3.75" 5.45" 1.50" 4.01" .40" .20" TTBI-AS-SW0400-N
Add

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