殷钢厚板材料激光焊接技术实验研究

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1、大连理工大学硕士学位论文殷钢厚板材料激光焊接技术实验研究姓名：尹波申请学位级别：硕士专业：机械制造及其自动化指导教师：吴东江20090601殷钢J孕扳材料激光焊接技术实验研究ExperimentalstudyonLaserWeldingofThicklnvar36AlloyPlateAbstractInlaserweldingprocess，becauseofitshighenergydensity，itcouldformabigratiowhichpenetrationdepthtopenetrationwidth．Addedtheweldingline

2、hasasmallheataffectzoneandaperfectappearance，laserweldinghasbeenmoreandmorepopularinweldfield．Invar36alloyisatypicalalloywithverylowthermalexpansioncoefficientunderroomtemperature．ItCanbeappliedtOmakethepartofhi曲precisiondeviceswhichthedimensionneverchangeswithtemperature，theshado

3、w—maskofLED，liquefiedgastankers，ocean—goingliquefiednaturalgaspipelinesandcompositemoldsintheaerospace．Especially，Invar36alloyiswidelyusedinlithographymachinesinrecentyears．TheresearchofInvar36alloyweldingtechniqueisincreasinglyconcernedrecently．LaserweldingInvar36alloyisanewlywel

4、dingtechnique，andlaserweldinghastheadvantageofhi曲precisionandlowheataffectzone．TheresearchonlaserweldingofInvar36alloyhassignificanttheoryandapplicationvalues．InthispaperaninvestigationaboutlaserweldingofthickInvar36alloyplateexperimentswascarriedoutbasedonlaserdeeppenetrationweld

5、ingtheorywithmillisecondpulseNd：YAGlaser，andtheweldingtemperaturefieldWassimulated．Thetheoryoflaserdeeppenetrationweldingandtheformoflaserweldingkeyholewasdiscussedinthispaper．Andthelaserprocessingparameters，whichpreparedforthefollowinglaserweldingexperiments，weredeterminedafterho

6、wtheweldqualitieswasinfluencedbytheprocessingparameterswasanalyzed．TheexperimentWascarriedoutonthethicknessof2mmInvar36alloyplatebyone—wayexperimentsmethod．Theinfluenceoftheparameters，includinglaserpower，pulseenergy，pulseduration，weldingspeedanddefocusingdistance，onthequalityandsu

7、rfacemorphologyoftheweldinglinewereinvesti．gatedandtheexperimentalresultswereanalyzedcombinedwiththetheoryoflaserdeeppene僦ionwelding．Themicrostructure，grainsizeandphase，chemicalcompositionandmechanicalpropertiesofthebuttweldjointsandmatrixweretestedbymetaloscope，X—raydiffractomete

8、r，energyspectrum，microhardnessand