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너트 프로젝션용접 품질 모니터링을 위한 전문가 시스템의 개발
김진우(J.W. Kim),임성룡(S.R. Lim),박찬우(C.W. Park),이광원(K.W. Lee),조상명(S.M. Cho) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
It has been very significant for car manufacturers to develop the quality assurance technology because of the application of PL(Product Liability). In the present study, during the nut resistance projection welding the current and voltage signal could be monitored to evaluate the welding quality. At the same time, dynamic resistance pattern could be obtained by the application of Ohm's law. Appling the dynamic resistance slopes to be defined as the differencial of the dynamic resistance by the proper time, process unstable factors such as initial contact, initial heat input and force followability could be evaluated. And the square sum of welding voltage and the end resistance could be used to evaluate total heat input and nugget growth. By setting up the algorithm to evaluate the various unstable conditions, the Expert System could be developed for the quality monitoring of the nut projection welding(M8)