Electric heating – Metal heating – By arc
Patent
1985-08-22
1986-12-30
Paschall, M. H.
Electric heating
Metal heating
By arc
219121LB, 219121LZ, 228103, 2504921, 73 24, 73607, B23K 2600
Patent
active
046330577
ABSTRACT:
A laser welder fault detector system, including a microphone and an associated electronic circuit operatively connected to a solenoid actuated ink jet, is provided to detect the formation of defective welds by an intermittently energized laser and to spray ink on sheets of metal being welded to mark the location of the defective welds. Defective welds are detected by acoustic signals generated during the welding process and picked up by the microphone, the amplitude of the signals, when defective welds are being formed, being relatively low compared to those generated when normal welds are being produced. The electronic components of the system compare the acoustic signals generated during the welding process with a reference signal characteristic of the formation of a normal weld. If the comparison is not favorable, indicating that a faulty weld has been produced, and the electronic circuit detects that the laser is energized and moving relative to the sheets being welded, the solenoid of the ink jet is activated to mark the metal sheets at the location of the defective weld.
REFERENCES:
patent: 4419562 (1983-12-01), Jon et al.
patent: 4543486 (1985-09-01), Rose
Curry Stephen J.
Falcigno Ralph
Struzek Kenneth
Wilson Craig A.
Avco Corporation
Frederick M. E.
Paschall M. H.
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