激光焊接原理与实践应用.ppt

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1、激光焊接LasersWeldingGirishP.Kelkar,Ph.D.激光LASER受激辐射式光频放大器的英文第一个字母的缩写LightAmplificationbyStimulationofEmittedRadiation参考资料References激光的工业应用-J.F.ReadyIndustrialApplicationsofLasers,J.F.Ready激光焊接，W.W.DuleyLaserWelding,W.W.Duley激光加工，W.M.SteenLaserMaterialsProcessing,W.M.SteenAWS焊接手册，1-4A

2、WSWeldingHandbooks,1-4激光加工手册-美国激光协会出版HandbookofLaserMaterialsProcessingPublishedbytheLaserInstituteofAmerica公开的相关文献Publishedliterature请记住…..Remember…..学习需要积极的参与Learningrequiresactiveparticipation不耻下问Feelfreetoaskquestions无所顾及地提出个人不同见解Donothesitatetopresentdifferentviewpoints光Light

3、光是一种电磁辐射Lightiselectro-magneticradiation我们听不到.Wavesthatyoucannothear可见光的波长在0.4-0.7微米之间。Visiblefrom0.4-0.7micronwavelength波长小于0.4微米是紫外线和X光Below0.4–ultraviolettox-rays波长大于700nm的光为红外线和微波。Above0.7–infra-redtomicrowaves0.40.7µmµmVisibleGammax-rayUVIRMicrowaveTVRadio0.01µm0.001µmYAG1µm光

4、的吸收和颜色AbsorptionandColor物体的颜色来源于它反射的光的波长Colorofanobject(wavelengththatitreflects)颜色和光的波长是相关联的。Colorisassociatedwithparticularwavelength黑色和白色代表着什么？Whatisthemeaningofblackorwhitecolor?黑色表面吸收了YAG光，而白色在反射了大部分光。BlacksurfacewillabsorbYAGlightwhilewhitewillreflectmostofit我们为什么需要激光？Whydow

5、eneedLasers?材料加工需要吸收很强的光。Absorptionformaterialsprocessingrequiresveryintenselight高强度的光可以通过激光聚焦成光束获得。Intensitycanbegeneratedbyfocusingabeamoflaserlight普通光不能聚焦成很高的能量密度（或足够小的点）Ordinarylightdoesnotfocusdowntoahighenoughpowerdensity(orsmallenoughspotsize)手持放大镜可以把太阳光聚焦让纸燃烧但是不能把金属融化Hand-

6、heldlenscanfocussunlighttosetfiretopaperbutnotenoughtomeltmetalLightandLasers单频的（单波长）Monochromatic(singlewavelength)校准的（平行光）Collimated(parallel)激光LaserLight普通光OrdinaryLight很多波长Manywavelengths不平行NotparallelLightandLasers激光LaserLight普通光OrdinaryLight激光的聚焦FocusingofLasers激光LaserLight普

7、通光OrdinaryLight单频（单波长）和校准（平行）的光可以聚焦成很小的焦点Monochromatic(singlewavelength)andCollimated(parallel)lightcanbefocusedtoaverysmallspot激光的种类TypesofLasers激光能量传输LaserPowerDelivery连续波ContinuousWave(CW)脉冲PulsedQ-开关Q-switched激光频率LaserFrequencies基频和倍频Fundamentalandmultiples连续光纤激光ContinuousWave

8、FiberLasers激光在光纤中产生Laserlightiscr