METHOD FOR DETECTING SHAPE OF WELDED STEEL PIPE BUTT-SEAM, METHOD FOR WELDED STEEL PIPE QUALITY CONTROL USING SAID METHOD, AND DEVICE FOR SAME

WIPO Patent Application WO/2018/116510

A1

The present invention provides a method for detecting the shape of a welded steel pipe butt-seam that makes it possible to accurately detect a step at a welded steel pipe butt-seam without requiring a high-speed data processing device or complicated mechanism. A non-contact means 14 is used to scan a butt-seam 12 of a welded steel pipe 10 and shape coordinate data L is obtained that is for a specific detection range including the butt-seam 12 and is laid out on a two-dimensional plane. Coordinates of the following points are selected from the shape coordinate data L: the starting point A and ending point D of the specific detection range, a first selected point B that is positioned between the starting point A and the butt-seam 12, and a second selected point C that is positioned between the butt-seam 12 and the ending point D. A first approximate circle α1 that includes the starting point A, the ending point D, and the first selected point B is calculated, and a second approximate circle α2 that includes the starting point A, the ending point D, and the second selected point C is calculated. The deviation between the obtained first approximate circle α1 and second approximate circle α2 is used as an index for expressing the shape of the butt-seam 12.

JP3856838	Methods and devices for measuring the shape of objects
JP3959223	INSPECTION CONDITIONAL CORRECTION METHOD OF PATTERN INSPECTION SYSTEM, MASK FOR MANUFACTURING SEMICONDUCTOR, PATTERN INSPECTION SYSTEM AND RECORDING MEDIUM

HIRAMOTO TAKAFUMI (JP)
KINO YASUYUKI (JP)
EHARA TERUO (JP)

PCT/JP2017/025746

June 28, 2018

July 14, 2017

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NISSHIN STEEL CO LTD (JP)

G01B11/24; B21C51/00; B23K31/00

JP2004117053A	2004-04-15
JP2008107156A	2008-05-08
JP3046530B2	2000-05-29
US20090272722A1	2009-11-05
JP3046530B2	2000-05-29

See also references of EP 3561445A4

MORI Yoshiaki et al. (JP)

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