US 2020/0038929 A1 · APPARATUS, METHOD, AND PROGRAM FOR MONITORING OPERATION OF HIGH FREQUENCY RESISTANCE WELDING AND INDUCTION HEATING WELDING OF ELECTRIC RESISTANCE WELDED STEEL PIPE

Abstract

The objective of the present invention is to enable accurate detection of a mismatch during electric resistance welding. This operation monitoring device for high-frequency resistance welding and induction heated welding of an electric resistance welded steel pipe, in which a strip-shaped metal sheet is continuously formed into a cylindrical shape by means of a group of rollers while being conveyed from an upstream side to a downstream side, and in which the two edge portions, in the circumferential direction, of the metal sheet, which are caused to converge into a V-shape, are caused to melt by the application of heat and are caused to abut one another, is characterized by being provided with a means for detecting a mismatch by recognizing a non-uniformity between light-emitting regions of a metal part, on both sides, in the circumferential direction, of the abutting position on an outer surface or an inner surface of the metal plate, on the basis of an image of a region including a V-convergence location, which is a location at which the two edge portions in the circumferential direction converge into said V-shape, and said metal part which is caused to flow out onto the surface of the metal plate by means of an electromagnetic force downstream of the V-convergence location, wherein said image is captured by means of an image capturing device from an outer surface side or an inner surface side of the metal plate that has been formed into said cylindrical shape.

Claims21

Dependent claims

An apparatus for monitoring an operation of high frequency resistance welding and induction heating welding of an electric resistance welded steel pipe where a strip of metal plate is continuously formed into a tubular shape by a group of rolls while being conveyed from an upstream side to a downstream side and two end parts of said metal plate in its circumferential direction made to converge to a V-shape are heated to melt and made to abut against each other, characterized in that

said apparatus detects misalignment by obtaining a grasp of unevenness of light emitting regions of metal parts at two sides in the circumferential direction at abutting positions at an outside surface or inside surface of said metal plate based on an image, captured by an imaging device from the outside surface side or inside surface side of said metal plate being formed into the tubular shape, of a region including a V-convergence portion where said two end parts in the circumferential direction converge to a V-shape and said metal parts flowing out to the surface of said metal plate by electromagnetic force at a downstream side from said V-convergence portion.

A method for monitoring an operation of high frequency resistance welding and induction heating welding of an electric resistance welded steel pipe continuously forming a strip of metal plate into a tubular shape by a group of rolls while conveying the strip of metal plate from an upstream side to a downstream side and heating two end parts of said metal plate in its circumferential direction made to converge to a V-shape to melt and making the two end parts of said metal plate abut against each other, characterized in that:

said method comprises capturing an image, by an imaging device from an outside surface side or inside surface side of said metal plate being formed into the tubular shape, of a region including a V-convergence portion where said two end parts in the circumferential direction converge to a V-shape and metal parts flowing out to the surface of said metal plate by electromagnetic force at a downstream side from said V-convergence portion, and detecting misalignment by obtaining a grasp of unevenness of light emitting regions of said metal part at two sides in the circumferential direction at abutting positions at the outside surface or inside surface of said metal plate based on said image.

A program for monitoring an operation of high frequency resistance welding and induction heating welding of an electric resistance welded steel pipe continuously forming a strip of metal plate into a tubular shape by a group of rolls while conveying the strip of metal plate from an upstream side to a downstream side and heating two end parts of said metal plate in its circumferential direction made to converge to a V-shape to melt and making two end parts of said metal plate abut against each other, characterized in that:

said program makes a computer run processing for detecting misalignment by obtaining a grasp of unevenness of light emitting regions of metal parts at two sides in the circumferential direction at abutting positions at an outside surface or inside surface of said metal plate based on an image, captured by an imaging device from the outside surface side or inside surface side of said metal plate being formed into the tubular shape, of a region including a V-convergence portion where said two end parts in the circumferential direction converge to a V-shape and said metal parts flowing out to the surface of said metal plate by electromagnetic force at a downstream side from said V-convergence portion.

Dependencies are inferred from the claim text.

Apparatus, method, and program for monitoring operation of high frequency resistance welding and induction heating welding of electric resistance welded steel pipe

Life of this patent

Apparatus, method, and program for monitoring operation of high frequency resistance welding and induction heating welding of electric resistance welded steel pipe

Life of this patent

Abstract

Claims21