METHOD FOR PRODUCING MULTI-WALLED METALLIC TUBES
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United States of America Patent
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Issued Date -
Mar 12, 2015
app pub date -
Aug 6, 2014
filing date -
Sep 6, 2013
priority date (Note) -
Abandoned
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Abstract
A method for producing a tube (10) from metal, which consists of an inner tube (5) and at least one outer tube (7) surrounding the same, is provided. To create the outer tube (7), a metal strip (2) running in longitudinally is formed around the inner tube (5) moved in its axial direction so as to form a slit tube in such a way that its edges running in the longitudinal direction lie against one another at a slit extending in the longitudinal direction. The slit is welded to complete an outer tube that is closed all around. The inner tube (5) is cooled and the the finished outer tube (7) is reduced in its diameter until it is in contact with the cooled inner tube (5) in at least one reducing stage.
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