Apparatus for measuring internal metal stress

Details Apparatus for measuring internal metal stress Apparatus for measuring internal metal stress

1979-06-13

1980-12-23

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204195C, 204195R, G01N 2702

Patent

active

042408920

ABSTRACT:
An apparatus and procedure for measuring internal metal stress and determining the effectiveness of metal stress-relief treatments. More specifically, an apparatus and procedure for determining the effectiveness of metal stress-relief by heat treatment in the heat-affected zone surrounding a metal weld. The apparatus comprises an electrical half-cell and a unique bridge system designed to provide intimate physical contact between the electrical half-cell and a metal surface. The apparatus permits a metal to half-cell electrical potential measurement to be made at various locations upon the metal surface. The electrical potential measurements provide a means of evaluating the efficiency of a stress-relief treatment in reducing internal stress within a metal.

REFERENCES:
patent: 2183531 (1939-12-01), Allison
patent: 2531747 (1950-11-01), Stearn
patent: 3705089 (1972-12-01), Grubb
patent: 3975681 (1976-08-01), Angelini et al.
patent: 4006063 (1977-02-01), Ensanian

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