Method of forming, inserting and permanently bonding ribs in boiler tubes
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United States of America Patent
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Jan 8, 2013
Issued Date -
N/A
app pub date -
Jun 6, 2008
filing date -
Jun 6, 2008
priority date (Note) -
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Abstract
A method of providing boiler tubes with a variably ribbed interior surface. A suitably dimensioned spindle with a channel having a desired pattern on the exterior surface of the spindle is wrapped by a wire-like member in the channel so as to form thereon a reverse image of the desired, patterned tube ribbing. A brazing metal paste is applied on the exterior surface of the wire-like member and the spindle is inserted into a tube to be ribbed. The wire-like member is released from the spindle to allow the wire-like member to conform to the inner surface of the tube, and the tube is heated to the melting temperature of the brazing metal paste so that the wire-like member bonds to the inner surface of the tube, and the metal tube is then cooled.
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