简介：Manyapplicationsofultrasonic-assistedmethodswereusedduringmetalsolidification,buttheycouldnotbeintroducedintoweldpool.Inthispaper,awayofultrasonicassistedTIGweldingisintroduced.Bydirectlyimposedultrasonicvibrationonweldingarc,thevibrationinteractswitharcplasmaandpassestotheweldpool.Measurementresultsshowthatarcpressureissignificantlyincreasedwiththeultrasonicvibrationandthearcpressuredistributionmodelsarechanged.Bead-on-plateweldingtestsonSUS304confirmthatthistechnologycaninfluencethestyleofmetalmeltingandincreaseweldpenetrationdepth.

简介：Crackopeningdisplacement(COD)wasappliedtocharacterizethefractureinitiationofthetoughhighdensitypolyethylene.Normalsinglesidenotchedthree-pointbendspecimensandsilicarubberreplicatechniqueswereusedtostudythecharacteristicCODofhigh-densitypolyethylenepipeanditsbutt-fusionjointsincludingtheweldfusionzoneandheataffectedzoneatdifferenttemperaturefrom-78℃to20℃.TestingresultsshowthatthecharacteristicCODappearstodependonthestructuralfeaturesthataredeterminedbyweldingprocessandthetestingtemperature.Asthetemperatureislowered,thecharacteristicCODofallzonesstudieddecreases.Becausetheweldingprocesssignificantlychangessomestructuralfeatureofthematerial,characteristicCODoftheweldfusionzoneisthesmallestoneamongthoseofthethreezones.TheresultscanbeusedfortheengineeringdesignandfailureanalysisofHDPEpipe.

简介：金属涂的cenospheres广泛地在工业被使用了。不同涂层方法导致不同典型金属电影。由化学涂层的cenosphere上的金属电影不看起来很光滑，展出积累的金属和表面上的大头针洞并且离开某点uncoated。同时，金属电影紧没被吸收到cenospheres上并且是容易的开脱皮。然而，磁控管劈啪作响准备的金属电影是紧缩的，光滑并且在大头针洞外面。这部电影有好亲密关系到cenosphere表面。甚至当cenosphere被压碎时，如此的电影不用它分开。两个都，金属电影给一样的XRD模式，显示金属的水晶结构由这二个方法拍摄是一样。化学涂层是一个复杂过程并且有害环境，而是它适合极其细小的粉末涂层(粒子尺寸能是不到2)。磁控管劈啪作响的方法是环境的友好并且快速工作，但是这个方法要求特殊设计的设备并且不为极其细小的粉末工作。如果粒子尺寸是不到30，涂层过程是难的继续。

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简介：Theeffectofnonmetallicinclusionsinthedropletofthestainlesssteelcoveredelectrodeontheporositywasresearched.Theresultshowsthatthenonmetallicinclusionsinthedropletarespherical,theircompositionisdifferentfromtheoneofslagandtheinclusionshavethecharacterof"innerformation".Whentheratioofrutiletoilmeniteinthecoatedmaterialisincreased,thedropletbecomescoarse,thecontentofnonmetallicinclusioninthedropletdecreases,andtheporositysensitivityintheweldmetalalsodecreases.Whentheratiooffledspartoilmeniteinthecoatedmaterialisincreased,thedropletbecomesfine,thecontentofnonmetallicinclusioninthedropletincreases,andtheporositysensitivityintheweldmetalincreases.WhentheratioofFe2O3toilmeniteinthecoatedmaterialisincreased,thedropletbecomesfine,thecontentofnonmetallicinclusiondecreases,whiletheporositysensitivitydoesnotreduce.

简介：Changesoftheaveragebrightnessandnon-uniformityofdarkoutputimages,andqualityofpicturescapturedundernaturallightingforthecolorCMOSdigitalimagesensorsirradiatedatdifferentelectrondoseshavebeenstudiedincomparisontothosefromtheγ-irradiatedsensors.Fortheelectron-irradiatedsensors,thenon-uniformityincreasesobviouslyandasmallbrightregiononthedarkimageappearsatthedoseof0.4kGy.Theaveragebrightnessincreasesat0.4kGy,increasessharplyat0.5kGy.Thepictureisveryblurryonlyat0.6kGy,showingthesensorundergoessevereperformancedegradation.ElectronradiationdamageismuchmoreseverethanγradiationdamagefortheCMOSimagesensors.Apossibleexplanationispresentedinthispaper.

简介：在典型周期的装载下面的near-alpha钛合金的疲劳行为上的试验性的调查被执行模仿装载在引擎片上使用的状态的服务。低周期的疲劳(LCF)测试的轴的控制压力的紧张紧张在最大的压力和压力比率的一个范围上被执行。旋转弯曲测试用一个装载步的过程被进行揭示高周期的疲劳(HCF)限制压力。周期的弄软效果在这材料被观察，并且紧张ratcheting在900装载的最大的LCF显然发生?MPa。LCF抵抗被发现依赖于装载的最大值和压力比率。为1的HCF限制压力?NA被货车derWaals力量鰨?鰨主要地管理？？

简介：Al-Cu-Mg-Ag-Zr合金的微观结构和性质上的打断的多步老化的效果被学习由张力，坚硬，电的电导率测试和传播电子显微镜学(TEM)。打断的多步老化与一步舞老化相比推迟了山峰老化时间并且当增加时，保留了T6脾气合金的象那些的坚硬，电的传导性，最终的张力的力量(UTS)，收益力量(YS)和延伸的一样的层次破裂坚韧尤其是。阶段和一些阶段在160硥瑡?在一步舞老化的过程同时猛抛并且成长????????湡楤慤???ì