METHOD OF MONITORING MANUFACTURING STATUS OF ELECTRIC RESISTANCE WELDED PIPE, DEVICE FOR MONITORING MANUFACTURING STATUS OF ELECTRIC RESISTANCE WELDED PIPE, AND METHOD OF MANUFACTURING ELECTRIC RESISTANCE WELDED PIPE

摘要

A device 1 for monitoring a manufacturing status of an electric resistance welded pipe monitors the manufacturing status of the electric resistance welded pipe manufactured by shaping a steel strip into a pipe and butt welding both end parts of the steel strip in a width direction along a lengthwise direction. The device 1 includes an imaging unit 3 arranged in a nozzle 2 having an opening 2a opposing a region in which both of the end parts of the steel strip in the width direction are butt welded and shielding the region with inert gas by ejecting the inert gas onto the region through the opening 2a, the imaging unit 3 having a visual field including the region. The device 1 also includes an analyzing unit 4 configured to determine the quality of a butt-welded part based on an image shot by the imaging unit 3.