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

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Atlas bimetallic transition couplings are robust, metallurgical 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). They are used in thousands of cryogenic, ultra high vacuum (UHV), and industrial applications worldwide.


Applications:

Our bimetallic couplings enable the high thermal conductivity of one metal (aluminum or copper) to directly transition to a poor thermal conducting metal such as stainless or titanium. Consequently they are used extensively in cryogenics as cryogen liquid or gas lines, or other thermal transfer applications where contrasting heat transfer is needed. They are also used in nonmagnetic or nuclear applications where the properties of one metal must be reliably switched to that of another.

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

Bonding Process:

Our all-welded bimetallic joints are fully metallurgical. They are explosive bonded using with a propriety low diffusion method that minimizes porosity 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 for low, medium, and high (<300, <600, and

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:

  • SCH4040 (pipe schedule

Pressure Test Certification:

  • L (Low pressure)

Specifications Environmental

  • Vacuum Rated to 1×10-9 Torr All bonds are vacuum tested
  • Peak Temperature: 300°C
  • Operational Temperature from 4K to 250°C (depending on the metal combination)


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-BW0037-Q
Add
3/8" DN 10 Not Qualified .625" .25" .625" 1.50" TTBI-AS-BW0037-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-W
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-MW0037-Q
Add
3/8" DN 10 Not Qualified .625" .25" .625" 1.50" 0.37" .40" 0.10" TTBI-AS-MW0037-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-SW0037-Q
Add
3/8" DN 10 Not Qualified .625" .25" .625" 1.50" 0.38" .40" .20" TTBI-AS-SW0037-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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