Electric heating – Metal heating – By arc
Patent
1997-03-03
2000-10-10
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
B23K 2636
Patent
active
061304042
ABSTRACT:
A method for preparing a multi-layer tube, useful prior to endforming for brakeline connections, comprises the steps of forming a metal tube having an outer surface and an end and bonding a corrosion resistant layer to the metal tube outer surface. A surface treatment layer is bonded to the corrosion resistant layer. A first polymeric layer is extruded onto the metal tube, such that it bonds to the surface treatment layer; and a second polymeric layer is extruded onto the metal tube, such that it bonds to the first polymeric layer. The method further comprises the step of vaporizing and removing at least a portion of the first and second polymeric layers from an area adjacent the end by rotating an axially defocused, generally elliptical cross-sectionally shaped laser beam 360.degree. about the area, while leaving the corrosion resistant layer intact.
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Campagna Guido M.
McDaniel James D.
Evans Geoffrey S.
ITT Automotive Inc.
Van Winkle Peter H.
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