Method and apparatus for marking an article following flaw detec

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material

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73629, 118 9, 118308, 427191, G01R 3312

Patent

active

041278151

ABSTRACT:
An eddy current flaw detection apparatus which is particularly adapted for inspecting articles at elevated temperatures. A plurality of detectors are supported about at least a portion of a workpiece path of travel to detect and locate flaws in workpieces. A non-magnetic, metallic shield is between the detectors and the workpiece path. A cooling medium is applied to the heat shield to protect the detectors from the heat of a hot workpiece. The cooling medium is also used to purge foreign matter from the assembly.
In one embodiment an exciter and detector assembly is disclosed which is constructed as an integral unit encapsulated within moisture-impervious material. In this embodiment, the assembly is movable relative to the workpiece path.
In another embodiment, the detectors and the exciter surround the workpiece path.
Metallic powder is sprayed on a hot workpiece to mark the location of detected flaws. The heat of the article fuses the marking metal powder in place on the hot workpiece.

REFERENCES:
patent: 3208868 (1965-09-01), Strobel et al.
patent: 3372054 (1968-03-01), Wishnie et al.
patent: 3418567 (1968-12-01), Mandula et al.
patent: 3720533 (1973-03-01), Gallagher
patent: 3897990 (1975-08-01), Bjerke
patent: 3996398 (1976-12-01), Manfredi
Godshall et al., Eddy Current Inspection of Pipe at 2150.degree. F.; ASME Publication #66-Pet-36; pp. 1-9.

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