Electric heating – Metal heating – For bonding with pressure
Patent
1996-11-08
1998-11-10
Mills, Gregory L.
Electric heating
Metal heating
For bonding with pressure
2191171, B23K 1124
Patent
active
058347291
ABSTRACT:
A method for adapting fuzzy reasoning to a change of a working environment of resistance welding without requiring a changing or updating of membership functions, thereby assuring optimal control and satisfactory weld quality. In an embodiment of the present invention, a welding current I and a change of resistance .DELTA.R across welding electrodes are measured during a welding operation. The number of welding operations N involving the welding electrodes is incremented. After the present welding operation, these values of .DELTA.R, I and N are offset by adding offsetting values .delta. .DELTA.R, .delta.I and .delta.N. Degrees of membership of respective antecedent membership functions are computed for the offset values (.DELTA.R+.delta. .DELTA.R), (I+.delta.I) and (N+.delta.N). Degree of membership of conclusion membership function of each control rule is computed from degrees of membership of its antecedent membership functions. Then degrees of membership of conclusion membership functions U, S and D is composed. From the composed degree of membership, an operation value i.e., percent change of preselected welding current is computed by the center-of-gravity defuzzification method. Finally, the preselected value of the welding current is corrected by using the percent change. The corrected preselected welding current is then used for the next welding operation.
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Mills Gregory L.
Miyachi Technos Corporation
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