POSITION DETECTION DEVICE FOR SEAM PORTION AND HEATED PORTION IN WELDED STEEL PIPE, MANUFACTURING EQUIPPMENT OF WELDED STEEL PIPE, POSITION DETECTION METHOD FOR SEAM PORTION AND HEATED PORTION IN WELDED STEEL PIPE, MANUFACTURING METHOD OF WELDED STEEL PIPE, AND QUALITY CONTROL METHOD FOR WELDED STEEL PIPE

摘要

This position detection device for a seam portion and a heated portion in a welded steel pipe detects the position of a seam portion and the position of a heated portion in a welded steel pipe and is provided with: a light source that irradiates the seam portion and heated portion with light with a first wavelength region; an imaging device that images the seam portion and heated portion irradiated with light by the light source; and an image processing device that processes the image captured by the imaging device and detects the positions of the seam portion and heated portion, wherein the imaging device has a first channel in which light with a first wavelength region can be received and a second channel in which light with a second wavelength region, corresponding to light emitted from the heated portion, can be received.