B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
B21C 37/20 (2006.01) B21C 37/15 (2006.01) F22B 37/12 (2006.01)
Patent
CA 2667860
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.
Hainsworth John
Mohn Walter R.
Tanzosh James M.
Watson George B.
Zeigler Douglas D.
Babcock & Wilcox Power Generation Group Inc.
Ridout & Maybee Llp
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