Bimetallic Transition Joints
Join Contrasting Metals
Prefabricated, non-separable, metallurgically bonded joints for field butt welding of dissimilar metal piping components
Overview
The Transition Joint is a prefabricated, non-separable, metallurgically bonded joint used for field butt welding of dissimilar metal piping components which are not weldable to each other.
Typical metals include aluminum to stainless steel for cryogenic applications, providing a reliable solution where direct welding between dissimilar metals is not feasible.
Technical Specifications
Over 40 years of proven manufacturing experience with comprehensive size and pressure ranges
Pipe Sizes
1/2" to 36" diameter
Temperature Range
Down to -320°F (-196°C)
Pressure Range
Full vacuum to 6,000+ psi
Manufacturing Experience
Over 40 years
Standards
ASME/ANSI, ASME B31.3, ASME Sec. IX
Bond Type
Metallurgically bonded
Proven Reliability
Manufactured for over 40 years with extensive application experience
TUBE TURNS® Transition Joints have been manufactured for over 40 years in pipe sizes ranging from 1/2" to 36" diameter and have been produced from a variety of stainless steels and aluminum alloys.
They are used to join stainless piping to aluminum piping for cryogenic services down to minus 320° F and are installed in heat exchangers, liquefied gas storage tanks and transfer lines.
They are used in many applications for pressures ranging from full vacuum to in excess of 6,000 psi, providing reliable performance across extreme operating conditions.
Stainless Steel Grades
Aluminum Alloys
Rugged Construction
Advanced metallurgical bonding technology for maximum reliability
The construction of these Transition Joints utilizes flanges and lap joint stub ends in accordance with ASME/ANSI dimensions that are proven to be reliable in all service conditions.
These components are continuously seal welded to a bimetallic ring to provide a leak-proof joint. This bimetallic ring consists of a layer of type 304 stainless steel and a layer of 1100 aluminum joined together by pressure welding to produce a strong, ductile solid-phase bond.
The flanges are then bolted together and the bolts tightened to a predetermined torque. The bolts and nuts are then tack welded to provide a non-separable unit.
These joints are constructed in accordance with ASME B31.3 Chemical Plant and Petroleum Refinery Piping and ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications.
Two Designs Available
To meet the varied requirements of the cryogenic industry, TUBE TURNS® offers two types of aluminum/stainless steel Transition Joints
Type "T"
Aluminum and stainless steel flanges
Key Benefits:
- More economical for high strength aluminum alloys
- Ideal for 6061-T6 systems
- Cost-effective solution
Applications:
- High strength aluminum systems
- 6061-T6 alloy applications
- Standard pressure applications
Type "K"
All stainless steel flanges with aluminum stub end
Key Benefits:
- More economical for higher pressure systems
- Better for lower strength alloys
- Enhanced durability
Applications:
- Higher pressure systems
- 3003 and 5083 alloy systems
- Critical pressure applications
The Type "T" design is generally more economical for systems using high strength aluminum alloys such as 6061-T6, whereas the Type "K" design is usually more economical for higher pressure systems utilizing lower strength alloys such as 3003 and 5083.
Applications
Trusted across critical industries for cryogenic and high-pressure applications
Heat Exchangers
Liquefied Gas Storage Tanks
Transfer Lines
Cryogenic Systems
Pressure Vessels
Chemical Processing
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