Measuring and testing – Moisture content or absorption characteristic of material
Patent
1975-08-18
1977-02-15
Goldstein, Herbert
Measuring and testing
Moisture content or absorption characteristic of material
G01N 2900
Patent
active
040076318
ABSTRACT:
Spot welds are evaluated using stress-wave emission techniques by measuring the stress-wave energy emitted from the weld area during n time intervals of the weld cycle, where n.gtoreq.4. Each of the time intervals corresponds to a different aspect of the weld cycle such as, for example, the initiation of heating, the separate solid-to-liquid phase transformation in each of the articles being welded, material combination within the weld nugget, cooling stresses occurring during resolidification, and post-weld cracking. The energy values obtained for each of the time interval can be compared with predetermined acceptable energy value ranges for corresponding ones of the intervals and/or compared with predetermined ratio values between two or more of the obtained interval values to determine the quality of a weld.
REFERENCES:
patent: 3713127 (1973-01-01), Keledy et al.
patent: 3782183 (1974-01-01), O'Connor et al.
patent: 3822586 (1974-07-01), Pollock
Jolly "The Application of Acoustic Emission to In-Process Inspection of Welds" in Materials Evaluation vol. 28, No. 6 6/70 pp. 135-139 and 144.
Beattie et al. "The Measurement of Energy in Acoustic Emission " in Rev. Sci. Instruments vol. 45, No. 3 March 74 pp. 352-357.
Saifi Mansoor Ali
Vahaviolos Sotirios John
Goldstein Herbert
Kirk D. J.
Pfeifle E. W.
Western Electric Company Inc.
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