Method and apparatus for eddy current inspection of hot test pie

Details Method and apparatus for eddy current inspection of hot test pie Method and apparatus for eddy current inspection of hot test pie

1976-11-22

1978-10-31

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With temperature control of material or element of test circuit

324225, 324240, G01R 3312

Patent

active

041237080

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: 2855565 (1958-10-01), Enders
patent: 3303691 (1967-02-01), Beaujard et al.
patent: 3694735 (1972-09-01), Mester
Godshall et al., Eddy Current Inspection of Pipe at 2150 Deg. F., ASME Publication; Sep. 1966; pp. 1-9.
Arnelo et al.; Eddy Current Inspection of Hot Rod; Mat Eval; Nov. 1968; pp. 230-235.
Stumm; W., New Developments in E.C. Testing of Hot Wire, Rod & Tubes; Non-Destructive Testing; Apr. 1971; pp. 101-105.

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