"Porous metallicmaterialswithcellularstructurescombinemanyphysicalandfunctionalcharacteristics. This mixtureofdifferentpropertiesmakesthesematerialsveryattractiveforthedevelopmentof advancedapplications,whichareespeciallyimportantinthebiomedical,structuralandfunctional engineering, andelectrochemical fields. Becauseoftheircellularstructure,unconventionalprocessingis becoming increasinglyimportantforpromotingtheindustrialapplicationsofthesematerials. In thiswork,theweldingofopen-cellCu60Zn40 [wt%] foamsusinga1kWcontinuous-wave fibre laser wasinvestigated.Duringweldingtestsperformedinthebead-on-plateconfiguration, adeteriora- tion ofthecellularstructurewasobserved,withpoorevidenceforthejoiningofsurfaces.Incontrast, tests performedinthelap-jointconfiguration resultedinsuccessfulweldingusinga1-mm-thickplateof the samematerialasthefoams.Theeffectoftheprocessspeedonthegeometricalcharacteristicsofthe transversesectionofthejointswasstudied,andtheheat-affectedzonewasevaluatedviaahardness test. Finally,acompositionalanalysisoftheweldbeadwasperformedusingascanningelectron microscope coupledwithanenergydispersivespectrometer. The resultsofthisstudyindicatethatweldingprocessesusinga fibre lasercanbeutilisedtojoinCu- based foams.Weldbeadsinthelap-jointconfiguration wereachievedduetothethinplatematerial filling theporevoids."

Laser beam welding of CuZn open-cell foams

BIFFI, CARLO ALBERTO;COLOMBO, DANIELE;TUISSI, AUSONIO
2014

Abstract

"Porous metallicmaterialswithcellularstructurescombinemanyphysicalandfunctionalcharacteristics. This mixtureofdifferentpropertiesmakesthesematerialsveryattractiveforthedevelopmentof advancedapplications,whichareespeciallyimportantinthebiomedical,structuralandfunctional engineering, andelectrochemical fields. Becauseoftheircellularstructure,unconventionalprocessingis becoming increasinglyimportantforpromotingtheindustrialapplicationsofthesematerials. In thiswork,theweldingofopen-cellCu60Zn40 [wt%] foamsusinga1kWcontinuous-wave fibre laser wasinvestigated.Duringweldingtestsperformedinthebead-on-plateconfiguration, adeteriora- tion ofthecellularstructurewasobserved,withpoorevidenceforthejoiningofsurfaces.Incontrast, tests performedinthelap-jointconfiguration resultedinsuccessfulweldingusinga1-mm-thickplateof the samematerialasthefoams.Theeffectoftheprocessspeedonthegeometricalcharacteristicsofthe transversesectionofthejointswasstudied,andtheheat-affectedzonewasevaluatedviaahardness test. Finally,acompositionalanalysisoftheweldbeadwasperformedusingascanningelectron microscope coupledwithanenergydispersivespectrometer. The resultsofthisstudyindicatethatweldingprocessesusinga fibre lasercanbeutilisedtojoinCu- based foams.Weldbeadsinthelap-jointconfiguration wereachievedduetothethinplatematerial filling theporevoids."
Joining; Laser; Metallic foam; Electronic, Optical and Magnetic Materials; Electrical and Electronic Engineering; Atomic and Molecular Physics, and Optics; Mechanical Engineering
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/968955
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