Patent ID: 11906593
Assignee: KEYSIGHT TECHNOLOGIES, INC.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 14:
15. A method of testing a structural integrity of a metal joint, comprising:
measuring a resistance of the metal joint to obtain a baseline impedance of the metal joint;
applying stress to the metal joint;
measuring a resistance of the metal joint during application of the stress to the metal joint using a four-terminal (4T) sensing method by separate pairs of current-carrying electrodes and voltage-sensing electrodes to obtain a stressed resistance of the weld;
determining a measured difference between the baseline resistance of the metal joint and the stressed resistance of the metal joint; and
comparing the measured difference to a threshold value, wherein a test result is a lack structural integrity when the measure difference exceeds the threshold value, wherein the measured and baseline resistances are respectively obtained from a real part of a measured complex impedance of the metal joint under stress and a real part of a measured complex impedance of the metal joint not under stress.