Buttweld reducing tee fittings have smaller sized tube on the branch port. Reducing tees are a common component of vacuum piping systems and are used to provide a reduced sized 90 degree branch.
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buttweld-reducing-tee-fittings - Drawings
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Specifications
Component Type
Buttweld Reducing Tee Fitting
Series
Series 23
Material
304 Stainless Steel
Features
Buttweld Component Construction
Butt weld vacuum fittings and components are constructed of 304 or 304L welded, drawn, and annealed stainless steel tubing. For most vacuum process applications, this provides the best combination of the following critical features:
Low outgassing under vacuum
Chemically resistant
Consistent leak free welding
Minimized corrosion concentration points
Cost consistent with the above requirements
Buttweld components are fabricated using pulled port and 100% penetration TIG weld techniques. All welded components are leak free, carefully cleaned for high vacuum use and then packaged to remain clean until the time of installation.
Recommended Welding Techniques
Butt weld fittings are designed to be welded using internal (socket type) welding and external buttwelding. The most commonly used type of weld for high vacuum applications is a Tungsten Inert Gas (TIG) fusion weld, preferably without filler rod. For the best results, remove vacuum components from packaging in clean conditions during installation. Use clean gloves to handle the components and equipment in the absence of any fibers, fingerprint oils, or other greases.
General hints for good vacuum welds include:
Always start with clean and properly weld prepped components.
For internal welds, minimize warping by using only enough heat for 60-75% penetration.
For external buttwelds, make sure they are 100% penetration with no internal cracks or crevices.
Do not weld internally then externally around the entire circumference of the fittings
Make sure there is little or no gap between pieces to be welded
Ensure that all surfaces affected by the heat of the weld, especially the vacuum side, are purged properly with inert gas.
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