Method and an arrangement for inspecting the surface of steel st

Details Method and an arrangement for inspecting the surface of steel st Method and an arrangement for inspecting the surface of steel st

1983-01-26

1985-08-13

Godici, Nicholas P.

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164150, 324203, 324228, B22D 200

Patent

active

045344051

ABSTRACT:
There is disclosed a method and arrangement for inspecting the surface of steel stock having a temperature above the Curie point. In order to detect, with a great certainty and accuracy, defects in the hot steel stock, with a loss of energy for cooling the steel stock for inspection and subsequently reheating it for further processing being avoided, only a thin surface layer of the steel stock is intensively cooled on the surface to be inspected, to a temperature below the Curie point. The core of the steel remains hot. Immediately thereafter, a magnetic or electromagnetic field is induced in the cooled surface layer and disturbances in the induced field caused by defects in the steel stock are detected and recorded by pick-ups.

REFERENCES:
patent: 2970256 (1961-01-01), Sazynski
patent: 3512401 (1970-05-01), Thalmann
patent: 4408160 (1983-10-01), King et al.
Godshall et al., Eddy Current Inspection of Pipe At 2150 Deg. F., American Society of Mechanical Engineers (Exrs. search room 324-224).

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