Patent ID: 8257637
Filing Date: 2012-09-04
Classification: B08B,B23K,Y10T

Abstract:
1. A method for removing a resin layer from an outer circumference of a resin-coated metal tube, the metal tube having an axis, the method comprising: irradiating said resin layer along a desired range parallel to the axis by focusing a laser beam of at least one laser irradiating device into at least one pinpoint without defocusing a sectional shape of said laser beam, rotating at least one of the resin-coated metal tube and the laser irradiating device about the axis of the resin-coated metal tube, and pivoting at least part of the laser irradiating device about a pivot axis angularly aligned to the axis of the resin-coated metal tube while simultaneously performing the rotating of at least one of the resin-coated metal tube and the laser irradiating device about the axis of the resin-coated tube for changing a laser irradiation angle relative to the axis of the resin-coated metal tube so that the laser beam burns out said resin layer in a block shape by scanning the laser beam focused into said pinpoint in a grating shape in a longitudinal direction and in a transverse direction and executing said grating shape scanning operation repeatedly to burn out the resin layer along the desired range, and wherein after said resin layer is burned out by irradiating said resin layer with the laser beam, the method further includes irradiating the resin layer again at a boundary with the metal tube to melt an end portion of said resin layer to seal the resin layer to the metal tube by melting and welding the resin layer to prevent liquid from penetrating between the resin layer and the metal tube.