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1、略談特種加工技術(shù)—激光焊接（Onthespecialprocessingtechnologyoflaserwelding）OnthespecialprocessingtechnologyoflaserweldingThisisknownas"thetwenty-firstCenturyuniversaltool",thelaserprocessingtechnology,advancedprocessingtechnologyitisahighlyflexibleandintelligent.Thelaserweldingisone
2、oftheimportantaspectsoftheapplicationoflasermaterialprocessingtechnology,ithasopenedaneweraofwelding.Laserweldinghasbeenwidelyusedinmanufacturingindustry,thefieldofpowdermetallurgy,automobileindustry,electronicindustry,biomedicalandotherfields.Weldingtechnologyintheeco
3、nomicandsocialdevelopmentofourcountryhasplayedanimportantrole,butwiththeprogressofscienceandtechnology,applicationofnewmaterialsandnewtechnology,thetraditionalweldingtechnologyhasbeenunabletomeettheincreasinglyhighrequirementsandconditions,whichmakesthelasermeltingofma
4、terialsscience,mechanics,computerscienceandotherrelatedknowledgeandtechnologytheweldingcameintobeing.WorkingprincipleoflaserweldingLaserweldingishaveexcellentdirectivity,highbrightness,highstrength,highmonochromaticity,highcoherencecharacteristicsoflaserbeamradiationto
5、thesurfaceareaoftheworkpiece,alaserbeampassingthroughthefocusingopticalsystem,thepowerdensityofthelaserfocusis104-107W/cm2,andtheinteractionisthroughthelaserweldingmaterial,inaveryshortperiodthetimetobeweldedtoformahighlyconcentratedheatsource,heatcanbeweldedafterzonem
6、eltingandcoolingcrystallizationformasolidsolderjointandweld.Accordingtothelaserandthedifferentwaysofworking,therearetwokindsoflaserweldingmethod,Apulsedlaserwelding,mainlyforsinglepointandcontinuousfixedmaterialweldingbook,acircularformationofthesolderjointsduringweldi
7、ng;Theotheroneiscontinuouslaserwelding,mainlyforlargethickpiecesofweldingandcutting,formingacontinuousweldweldingprocess.Speakingingeneral,thechoiceofweldingmaterial,laserweldingmachine,workingplatform,isthemainfactoraffectingtheeffectoflaserwelding.Themeltingphenomena
8、intheweldingprocesscanproduceandproduceintensitydependsmainlyonthematerialsurface,laserpowerdensityandpeakpower,goodc
