ta15钛合金激光焊接温度场的测量与焊缝特征分析

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1、(2)Whilelaserpowerkeepthesame，themaximumtemperatureinsurfacetemperaturefieldincreasealongwithdecreasingofweldingspeed；themaximumtemperatureinbacktemperaturefieldchangedirregularwhenweldingspeeddecreases．(3)Whilelaserpowerkeepthesame，therelationshipofsurfacethermalcyclingcharacterparametersandheat

2、inputasfollowing：(a)thetimeabovefreezingpointincreasesalongwiththeincreasingofheatinput；(b)theaverageheatingrateofmoltenpooldecreaseswhiletheheatinputincreases；(c)meaveragecoolingrateof800～500。Cand800～300。Cdecreaseswhiletheheatinputincreases，and∞c．8／5ismuchlargerthan∞c．8／3．(4)Thermalimagesofmolte

3、npoolCanbegotbymeansofhigh—speedcameramonitoring，afteranalysisandcalculation，thethree-dimensionalweldingtemperaturefieldcanberestructed．(5)Whenheatinputislarge，heat-affectzoneisrelativelywide，grainsrefinesgraduallyinthedirectionalongfusionlinetobasemetal，heat—affectzoneofphrasetransitionisobvious

4、；whenheatinputissmall，heat-affectzoneisrelativelynarrow，itisdifficulttoidentifyheat．affectzoneofphrasetransition．Sheetismoresensitivetoheatinputthanthick．Whenheatinputincreases，thelikelihoodofweldingdefectsincreases，andasheatinputincreases，itispronetodiscoverdefects，whileHeasshieldinggas．Keywords

5、：laserwelding，titaniumalloy，real—timemonitoring，temperaturefield，weldshapingV目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯IAbstract．⋯．．．⋯．⋯．⋯⋯⋯．⋯．⋯⋯．．．⋯⋯．⋯．⋯．⋯⋯．⋯．⋯．．⋯．⋯．⋯⋯⋯．⋯⋯⋯．．⋯．⋯．⋯⋯．⋯⋯III第1章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1概述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．2激光焊接技术国内外研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1

6、1．2．1激光器发展现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．2．2激光在焊接中的应用现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．2．3激光深熔焊机理⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．3钛合金激光焊接研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯31．4激光焊接质量实时监测技术发展现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯41．5激光焊接温度场的国内外研究现状⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯51．6论文的研究目标和主要内容⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯6第2章激光焊接过程监测试验材料、设备及研究方案⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．82．1试验材料⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯

7、⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯82．2试验仪器与设备⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯82．2．1激光焊接设备系统⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．92．2．2高速摄像系统⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．92．2．3红外热像系统⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯102．2．4光学试验台⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯122．2．5激光焊接熔池分析和计算相关软件⋯⋯⋯⋯⋯