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界面波在堆焊层超声波测厚上的应用.docx

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界面波在堆焊层超声波测厚上的应用 Introduction Ultrasonicthicknessmeasurementisawidelyusednon-destructivetestingmethodintheindustry.Ithasbeenextensivelyusedinweldinspection,corrosionmonitoring,andindustrialprocesscontrol.Inrecentyears,interfacewaveshavebeenproposedasausefultoolforultrasonicthicknessmeasurementofwelds.Interfacewavesaretheguidedultrasonicwavesthatpropagatealongtheinterfacebetweentwomaterials.Whentheinterfaceoftwomaterialsisperpendiculartothedirectionoftheultrasonicbeam,thenonlytheinterfacewaveisexcitedandpropagated.Inthispaper,wewilldiscusstheuseofinterfacewavesforultrasonicthicknessmeasurementinwelds. Background Ultrasonicthicknessmeasurementisacommonnon-destructivetestingmethodusedintheindustry.Theconventionalultrasonicpulse-echomethodiswidelyusedforthicknessmeasurement.Thismethodisbasedonthemeasurementofthetimedelaybetweenthetransmittedandreceivedultrasonicsignals.However,thismethodhaslimitationsinweldinspectionduetothepresenceofmultipleechoes.Inwelds,theultrasonicwavesundergosignificantcouplingwiththeweldedmaterials,leadingtostrongbackscatteringandmultiplereflections.Thesemultipleechoesmakeitdifficulttoaccuratelymeasurethethicknessofthewelds. Interfacewaveshavebeenproposedasanalternativetoovercometheselimitations.Interfacewavesareguidedultrasonicwavesthatpropagatealongtheinterfacebetweentwomaterials.Interfacewavesareexcitedbyawedgetransducerwhichisplacedattheedgeoftheinterface.Whentheinterfaceoftwomaterialsisperpendiculartothedirectionoftheultrasonicbeam,thenonlytheinterfacewaveisexcitedandpropagated.Thischaracteristicofinterfacewavesmakesthemsuitableforthemeasurementofthethicknessofwelds. Application Theuseofinterfacewavesforultrasonicthicknessmeasurementinweldshasbeenextensivelystudiedinrecentyears.Interfacewaveshavebeenshowntoprovideaccuratethicknessmeasurements,eveninthepresenceofmultipleechoes.Moreover,interfacewavesaresensitivetochangesintheweldthicknessandcanbeusedtodetectdefectssuchascorrosion,erosion,andcracks. Interfacewaveshavebeensuccessfullyusedinthem