| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic powder flaw detection method capable of obtaining good visibility, even if the surface of an inspection target is discolored by the effect of the time elapse or heat treatment after welding, to enhance the detection accuracy of flaws, in non-fluorescent type magnetic powder flaw detection to which a black magnetic powder is applied. SOLUTION: The black magnetic powder is used as a magnetic powder and, before the magnetic powder is scattered over the surface of the inspection target 1, the inspection target 1 is coated with coating 3, having a color brighter than the surface color of the inspection target 1. The coating 3, preferably, is white color. COPYRIGHT: (C)2008,JPO&INPIT
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