Laser welding welding position detection device and welding position detection method

Abstract

A welding position detecting apparatus for laser beam welding according to the present invention includes an imaging device (5) that captures, at a predetermined time interval, images of an irradiated portion (4) of a welded steel pipe (1) irradiated with a welding laser beam (3), and a surrounding area thereof, of the welding material; an image processing device (6) that identifies a position of the irradiated portion (4) irradiated with the welding laser beam (3) by performing image processing calculating, from two or more images acquired by the imaging device (5), a direction and an amount of parallel movement of points in the images; and a display device (7) that displays the position of the irradiated portion irradiated with the welding laser beam, the position being identified by the image processing device (6).

Description

technical field [0001] The present invention relates to a welding position detection device and a welding position detection method for laser beam welding in which a joint portion (seam) of a welding material is welded using a laser as a concentrated heat source . Background technique [0002] As one of the manufacturing methods of welded steel pipes, there is a manufacturing process of continuously supplying a steel strip or the like, shaping it into a cylindrical shape, joining and welding both edges to manufacture a steel pipe product. As a welding method in this manufacturing process, resistance welding (ERW method) is often used, but in recent years, a laser welding method using a laser as a heat source has been utilized. Laser welding machines, such as semiconductor lasers and fiber lasers, have been developed that have shorter oscillation wavelengths than existing gas oscillation lasers (Gas lasers). , it is difficult to reduce the efficiency due to the plasma gener...

AI Technical Summary

Problems solved by technology

However, in the continuous shaping process of the steel strip, the joint position of the steel strip is likely to change due to the conditions of the production line and heating conditions, etc.

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