简介:微单VⅠ是面向年轻人的一款极致完美、智能操控、张扬个性、便于存放的绿色交通工具,希望能解决城市年轻人出行的痛点,在城市里年轻人希望拥有一款轻便方便折叠又不占空间的代步工具。更加符合人体工程学的车架角度设计,专为长时间骑行而改进的舒适转把,更加符合电动车刹车力矩的刹把,简单快捷的折叠结构,高度整合的电池托架结构,以及为夜间安全出行缜密设计的灯光系统,
简介:Ionbeamenhanceddeposition(IBED)wasemployedtoincreasethefrettingfatigueresistanceofTi6AI4V.CrNandTiNhardcoatingswereappliedonthebasematerialandshotpeeningwascombinedwiththehardcoatingstostudytheduplexeffectonfrettingfatigueresistance,TheIBEDcoatingsexhibitedagoodbondingstrength.Theydidnotspalloffevenaftershotpeening.However,anoptimumcompositionofCrNshowedbetterfrettingfatigueresistancethanthatofTiNwiththesameprocessingparameters.
简介:InthisstudyweconductedsingleV-groovebuttwelding(GTAW)onthreetypesofheattreatablealuminumalloys2024-T351,6061-T6and7075-T6andcomparedtheangulardistortionlevelsofthethreealuminumalloysatdifferentVeepreparationangleswithorwithoutrestraint.ExperimentalresultsdemonstratedthatwhentheVeepreparationanglewas0°(I-shapedgroove),theangulardistortionleveloftherestrainedweldmentcanexceedthatoftheunrestrainedweldments.Moreover,whentheVeepreparationanglewas45°,60°or90°,therestrainedweldmenthadlowerangulardistortionthantheunrestrainedweldments.ThesingleVeepreparationangle(amountoffillermetal)inbuttweldingaffectedtheangulardistortionoftheweldment.Withoutrestraint,theangulardistortiontendedtoincreasewiththesingleVeepreparationangle.Meanwhile,theangulardistortiontendedtodecreasewhenthesingleVeepreparationanglewas60°.Additionally,arestrainedweldmenthadhighangulardistortionwhenthesingleVeepreparationanglewas0°.Notably,theangulardistortiontendedtoreducewithincreasingsingleVeepreparationangle.Theangulardistortionoftheweldmentwasminimizedatanangleof60°.However,theangulardistortionincreasedwhentheVeepreparationangleexceeded60°.Thehigh-temperatureyieldstrengthofamaterialalsoaffecteditsangulardistortion.Angulardistortionincreasedwithhigh-temperatureyieldstrength.Experimentalresultsalsoshowedthat,fromthestrongesttotheweakest,thehigh-temperatureyieldstrengthofthethreetypesofaluminumalloysfollowedtheorder6061-T6and2024-T351>7075-T6.