Method and apparatus for determining the acceptability of a weld

Details Method and apparatus for determining the acceptability of a weld Method and apparatus for determining the acceptability of a weld

1977-07-05

1978-05-02

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

040868176

ABSTRACT:
Stress wave emission signals emanating from a weld during an AC welding operation are detected during (1) the time when the AC power is on, (2) the post weld time period, and (3) during each half-cycle of the AC weld when the absolute magnitude of the current is decaying. The stress wave emission signals are counted in each of these periods and compared to predetermined ranges of values to determine the acceptability of the weld.

REFERENCES:
patent: 3824377 (1974-07-01), Notvest
patent: 3965726 (1976-06-01), Vahaviolos
patent: 4007631 (1977-02-01), Saifi et al.

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