Detecting method of weld part of electric welded pipe

Abstract

PURPOSE:To detect a weld part with high accuracy, by irradiating diagonally a laser beam from the upper part in the pipe axial direction, photodetecting the reflected light at an opposite position, and bringing its photodetected image to picture processing. CONSTITUTION:A light source 11 is irradiated diagonally from the upper part of a weld part 8, along the longitudinal direction of an electric welded pipe, and regularly reflected light at the weld part is photodetected by a photodetecting system 12. The weld part is cut by a cutting tool, is in a specular state, and luminance of its reflected light is higher than other part, therefore, it can be detected easily.

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