WELDED STATE MONITORING DEVICE AND METHOD

摘要

A welded state monitoring device and method for monitoring on-line the state of an electric-resistance welded pipe, such as the welded state, or the butted state, more correctly than conventional. A mirror (23) provided at a one-end portion in a case (21) receives light emitted from a welded portion (5) of a cylindrical steel sheet (1) sideways through heat-resistance glass (22) to project the image of the welded portion (5) toward a relay lens (24) provided to the root-end portion in a relay lens unit (13). The relay lens (24) transmits the image of the welded portion (5) to a converter lens (12), and the converter lens (12) forms the image onto the imaging surface of a CCD camera (11). Therefore, the welded portion (5) can be imaged sideways with a resolution corresponding to the resolution of the CCD camera (11), and information on the welded portion (5) can be collected on-line more correctly than conventional.