Ultrasonic method of inspecting spot welds

Details Ultrasonic method of inspecting spot welds Ultrasonic method of inspecting spot welds

1979-11-30

1981-05-05

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73612, G01N 2900

Patent

active

042651190

ABSTRACT:
To obtain a measure of the size of a spot weld nugget, the weld is scanned with an ultrasonic beam of about 20 megahertz frequency. The ultrasonic signal transmitted through the part is analyzed to determine the presence of the part and the presence of a weld. The detected signal is gated to pass a portion of the signal which has been multiply reflected through the weld region to a bandpass filter which passes frequencies that are selectively attenuated by a weld nugget much more than the surface bond or stick zone surrounding the nugget so that the energy content of the filtered signal is used to determine the presence of nugget material at any point during the scan. A chart recorder controlled according to the energy content of the filtered signal produces a characteristic signature for each weld which distinguishes between the extent of the stick zone and the nugget of each weld so that the weld nugget size is readily determined.

REFERENCES:
patent: 3554029 (1971-01-01), Deininger, Jr.
patent: 3791199 (1974-02-01), Toth et al.
patent: 4158308 (1979-06-01), Sharpe et al.

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