Joint and joining method for multilayer composite tubing and fittings
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United States of America Patent
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Issued Date -
Apr 23, 2009
app pub date -
Oct 17, 2008
filing date -
Oct 17, 2007
priority date (Note) -
Abandoned
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Abstract
A joining method wherein ends of multilayer composite tubing and/or fittings having at least one middle layer of malleable metal are flared radially outwardly so that exposed ends of the middle layer of malleable metal are directed radially outward and away from a fluid flow path within the tubing and/or fittings. The flared-out ends are then fused using infrared butt welding so that the resulting bead protrusion into the fluid flow path is small enough to be acceptable for use in a high purity water system.
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