Method non-destructively identifying different kinds of rolled s

Details Method non-destructively identifying different kinds of rolled s Method non-destructively identifying different kinds of rolled s

1983-12-30

1986-01-28

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

G01R 2714

Patent

active

045674272

ABSTRACT:
A method of non-destructively identifying different kinds of rolled steel for structural purposes is disclosed, which is based on a synchronous detection process using a minute AC signal current. Four terminal probes arranged in a row and spaced apart at a precisely uniform pitch are held urged against a measuring surface of steel under test. The signal current is passed through the steel via the opposite end terminal probes. A potential difference is detected between the other two terminal probes. A resistivity corresponding to the detected potential difference is determined, and a corresponding value of silicon content in the steel is determined. The kind of steel is identified according to the determined silicon content.

REFERENCES:
patent: 2094234 (1937-09-01), Drain, Jr.
patent: 3308418 (1967-02-01), Rose
patent: 3611125 (1971-10-01), Press
patent: 4335350 (1982-06-01), Chen

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