Electric heating – Metal heating – For bonding with pressure
Patent
1974-12-18
1977-01-04
Truhe, J. V.
Electric heating
Metal heating
For bonding with pressure
2351511, B23K 1124
Patent
active
040015408
ABSTRACT:
A monitoring and control system for use in conjunction with a pulsation type welder which utilizes a computer to calculate the impedance characteristics of a weld and compare these characteristics to a preselected set of characteristics to determine if a quality weld has been made. The system then controls the heat and cool time to increase or decrease the temperature of the weld and thus control the size of the weld nugget. The monitoring control system is utilized in conjunction with a standard pulsation welding control system, which standard system provides a series of heat impulses each followed by a cool interval, this cycle being repeated for a preselected number of cycles. The monitoring and control system senses the voltage and current in the welding load and feeds this data to a computer which, in turn, calculates the impedance of the weld. This calculation is then compared to a predetermined set of standards which are evolved as a result of processing a preselected number of previous welds, and corrections are made to assure the weld quality. If the weld is not developing sufficiently, the number of cycles in the cool portion of the impulse, and thus, the cool time, is reduced until the weld meets the set standards. On the other hand, if the weld exceeds the standard, the number of heat cycles, and thus the heat time, is reduced.
REFERENCES:
patent: 2817747 (1957-12-01), Devonshire et al.
patent: 2848595 (1958-08-01), Van Sciver
patent: 3569785 (1971-03-01), Durbeck
patent: 3588438 (1971-06-01), Vanderheist
patent: 3888405 (1975-06-01), Jones et al.
Drake Charles J.
Farrow John F.
Kelsey-Hayes Company
Shaw Clifford C.
Truhe J. V.
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