Communications: electrical – Systems – Call station
Patent
1976-03-15
1977-05-17
Caldwell, John W.
Communications: electrical
Systems
Call station
73 69, 310 81, 228 1R, G08B 2100, G01N 2904
Patent
active
040245225
ABSTRACT:
A system for flaw detection during a continuous welding process uses a transducer to provide a signal burst for each acoustic burst from an article being welded. The signal burst is amplified and filtered to pass frequencies between about 100 and about 550 KHz. The ring-down counter counts signals of the filtered signal burst. The first signal of the filtered signal burst initiates a timing circuit that times out to provide a reset pulse to reset the ring-down counter. If the decimal count exceeds 100 but does not exceed 1000, the ring-down counter operates circuitry to provide a latched signal to an output of a flip-flop to enable a gate before the counter is reset by the reset pulse of the timing circuit. That reset pulse is also provided to the gate to provide at its output a pulse representing one filtered signal burst having more than 100 and no more than 1000 signals during the timing operation. The pulses from the gate are inputs to a pulse counter in the counter mode and a retriggerable monostable multivibrator that, if not retriggered by the next pulse before a predetermined time, resets another flip-flop and resets the pulse counter. If the pulse counter counts a predetermined number of pulses before it is reset, it sets that another flip-flop to provide a signal to an alarm device that turns on a light indicating that there is a weld flaw.
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patent: 3212695 (1965-10-01), MacGregor
patent: 3302277 (1967-02-01), Pruden et al.
patent: 3406272 (1968-10-01), Ehrlich
patent: 3573781 (1971-04-01), Shoh
patent: 3708648 (1973-01-01), Croucher et al.
patent: 3784079 (1974-01-01), Spanjer
patent: 3815812 (1974-06-01), Tauern
patent: 3827619 (1974-08-01), Cusick et al.
Chin Fay K.
Clark Robert N.
Prine David W.
Caldwell John W.
Gard, Inc.
Myer Daniel
White Claron N.
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