| 摘要 |
A method for controlling resistance welding adaptively optimizes a set value of welding current for the next welding operation by inference from monitored signals of the present welding operation. In an embodiment, 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 mapped into compatibility degrees of respective antecedent membership functions. Compatibility degree of conclusion membership function of each control rule is computed from its antecedent membership function compatibility degrees. Then compatibility degree of conclusion membership functions U, S and D is composed. From the composed compatibility degree, an operation value i.e., percent change of set welding current is computed by the center of gravity defuzzification method. Finally, using the percent change, the set value of welding current is corrected. The corrected set welding current is used for the next welding operation.
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