A inodcl was dcvelopcd to prcdict thc wcld pool shapc in pulscd Nd:YAG lascr welds of aluiiiinuin alloy 5754. Tlic inodcl utilizcd ncural nctwork analysis to rclatc tlic wcld proccss conditions to four pool shape par,lmctcrs: pciictration. width. width at half-pcnctriition. and cross-scctional i i m. Tiic iiiodcl dcvelopmcnt involvcd tlic idcntification of tlie input (proccss) variables, tlie desired output (sliape) variablcs. and tlic optiinnl neuraldictyo~k $ccl@gyc:: ?The lattcr was influcnccd by tlic numb~~f-acfined=Idputs;andJoulputs as ivcll as tlic ainount of &?la that ?ysgvailable for training tlie nctwork. Aftcr appropriate training, ilid%cst":det?&& was identificd and was uscd to prcdict tlie weld shape., &routine to convert tlic shapc parainctcrs into prcdictcd ~tcld~-pr~fiEg;was also dcvclopcd. This routiiic was bascd on tlic actual csperimcntal weld profilcs and did not iinposc an artificial analytical function to dcscribe tlic wcld profilc. Tlic ncural nctwork iiiodcl was testcd on cspcriinciitiil wclds. Tlie iiiodcl prcdictions wcre csccllcnt. It was found that tlic prcdictcd shapes \\ere witliin tlie espcrimcntal wriatioiis t1i:it wcrc found along the lcngtli of tlic welds (due to the pulscd nature of the wcld powcr) and tlie rcproducibility of welds IiIiidC under noiiiiniilly identical conditions.
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