Laser irradiating torch

摘要

A laser irradiating torch device is used to apply corrosion resistant coating or other coatings to an inner surface of small diameter piping. The torch device consists basically of a torch body disposed in the rearward end of the torch device; a revolving torch head disposed in the forward end of the torch device which revolves around the central axis of the torch device; and a driving device to rotate the torch head disposed in the rearward end. A laser beam generated outside the torch device is transmitted to the torch head in an optical fiber disposed, longitudinally through the central axis, and the focal point of the laser beam can be adjusted with a lens system whose location can be adjusted in the axial direction. The transmitted laser beam is reflected radially out of the torch device with a reflection mirror, and the lens system is adjusted so that the laser beam is focused near the inner surface of the piping. When the torch device is inserted in the piping, a centering device aligns the torch body and the torch head centrally within the piping so that the revolving axis of the torch device coincides with the central axis of the piping. When the torch head is rotated and the laser beam turned on, the inner wall surfaces of the piping is heated uniformly to produce a coating of excellent consistency, thus producing a coating having superior corrosion resistant properties.