OPERATION MONITORING DEVICE, METHOD AND PROGRAM FOR HIGH-FREQUENCY RESISTANCE WELDING AND INDUCTION HEATED WELDING OF ELECTRIC RESISTANCE WELDED STEEL PIPE

Title:

OPERATION MONITORING DEVICE, METHOD AND PROGRAM FOR HIGH-FREQUENCY RESISTANCE WELDING AND INDUCTION HEATED WELDING OF ELECTRIC RESISTANCE WELDED STEEL PIPE

Document Type and Number:

WIPO Patent Application WO/2018/092492

Kind Code:

A1

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.

Inventors:

HASEGAWA NOBORU (JP)
HAMATANI HIDEKI (JP)
MIURA TAKAO (JP)
KARUBE YOSHIFUMI (JP)
YAMAMOTO KAZUTO (JP)

Application Number:

PCT/JP2017/037591

Publication Date:

May 24, 2018

Filing Date:

October 17, 2017

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B21C37/08; B21C51/00; B23K13/00; G01N21/892

Foreign References:

JP2011000642A	2011-01-06
JP2015217420A	2015-12-07
JPH0740061A	1995-02-10
JP2000271637A	2000-10-03

Other References: