Electric heating – Metal heating – For bonding with pressure
Patent
1974-12-18
1984-05-08
Shaw, C. C.
Electric heating
Metal heating
For bonding with pressure
219111, 2191171, B23K 1124
Patent
active
044476981
ABSTRACT:
A monitoring and control system for use in conjunction with a pulse 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 tmeperature of the weld and thus control the size of the weld nugget. The monitoring control system is utilized in conjunction with a standard pulse welding control system, which standard system provides a series of heat impulses followed by a series of cool impulses, 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 temperature of the weld has not been sufficiently elevated, the number of impulses in the cool portion of the cycle, and thus the cool time, is reduced until the weld meets the set standards. On the other hand, if the temperature exceeds the standard, the number of heat impulses, and thus the heat time, is reduced.
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Drake Charles J.
Van Sikle Truman T.
Kelsey Hayes Company
Shaw C. C.
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