Magnetic particle testing equipment for pipes, magnetic particle testing method, manufacturing equipment, manufacturing method, and quality control method.

The magnetic particle testing apparatus optimizes optical element positioning to ensure sufficient ultraviolet light irradiation and clear imaging of small-diameter pipe inner surfaces, addressing interference and signal distinction challenges.

JP2026084229APending Publication Date: 2026-05-21JFE STEEL CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
JFE STEEL CORP
Filing Date
2024-11-11
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing magnetic particle flaw detection technologies face challenges in irradiating the inner surface of small-diameter pipes with sufficient ultraviolet light intensity and capturing defect images without interference, particularly in distinguishing between false patterns and defect signals.

Method used

A magnetic particle testing apparatus and method that positions an optical element to transmit ultraviolet light from a light source and reflect fluorescence to an imaging unit at a predetermined angle, optimizing distances and angles based on pipe diameter and defect magnification ratio to ensure sufficient illumination and clear imaging of the inner surface.

Benefits of technology

Enables effective magnetic particle testing of small-diameter pipes by ensuring sufficient ultraviolet light irradiation and clear defect imaging, reducing interference and improving the distinction between false patterns and defect signals.

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Abstract

To provide a magnetic particle testing apparatus and method for pipes that can irradiate the inner surface of a pipe with ultraviolet light of sufficient intensity, regardless of the existing equipment layout, and capture images usable for magnetic particle testing of the inner surface of the pipe. [Solution] In the magnetic particle flaw detection apparatus for pipes according to the present invention, the optical element is positioned such that the optical axis of the light source reaches the intersection line of the pipe cross-section and the inner surface of the pipe, which is located a first distance away from the end face of the pipe in the direction outward along the pipe axis, a second distance away from the pipe axis in the direction radially of the pipe, and a third distance away from the end face of the pipe in the direction inward along the pipe axis. The second distance is set based on the inner diameter of the pipe, the first distance, the third distance, and the defect magnification ratio, which is the ratio of the apparent defect's length in the pipe axis direction to the actual defect's length in the pipe axis direction.
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