Method and apparatus for the real-time evaluation of welds by em

Details Method and apparatus for the real-time evaluation of welds by em Method and apparatus for the real-time evaluation of welds by em

1975-07-02

1976-06-29

Gill, James J.

Measuring and testing

Moisture content or absorption characteristic of material

G01N 2900

Patent

active

039657264

ABSTRACT:
Spot welds are evaluated using stress-wave emission techniques by detecting and measuring the stress waves emitted from a weld area during a first solid-to-liquid phase transformation period and a second liquid-to-solid phase transformation period of the weld. The stress waves emitted during the first transformation period provide an indication of the weld nugget size, while the stress waves emitted during the second transformation period provides an indication of the amount of post-weld cracking in the weld area. By subtracting the stress-wave energy measured during the second transformation period from the stress-wave energy measured during the first transformation period, an indication of the strength of the weld is obtained.

REFERENCES:
an Article "The Application of Acoustic Emission to In-Process Inspection of Welds" by W. Jolly, from Materials Evaluation, vol. 28, pp. 135-139, 144, June 1970.
"The Measurement of Energy in Acoustic Emission" by Beattie et al, from Review of Scientific Instruments, 3/74 pp. 352-357 (pp. 352-353).
"Acoustic Emission Tests Begin to be Heard" by Hartman from Iron Age, 9/74, pp. 43-45.
"Forecasting Failures with Acoustic Emission" by Herzog, from Machine Design, 6/73, pp. 132-137.

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