简介：2012年以来,中央每一个关于国企改革的文件出台,每一项重大新闻事件发生,国企改革专家李锦总在第一时间发言,从极为复杂的现象中归纳出合乎逻辑的发展轨迹,指出前景,提出自己的见解与对策。在本文中,他总结了国企改革五年来所走过的路,并提出下一步国企改革的发展趋势。近一个多月来,国企改革显得极为突出,联通混改方案出台,神华国电闪电重组,中铁总动作频频,50亿混改子基金助阵,公司制积极推进,国企改革动作连连。在十九大前国企改革形成突破之势。

简介：Mostoftheinvestigationsregardingfrictionstirwelding(FSW)ofaluminumalloyplateshavebeenlimitedtoabout5to6mmthickplates.InpriorworkconductedthevariousaspectsconcerningtheprocessparametersandtheFSWtoolgeometrywerestudiedutilizingfrictionstirweldingof12mmthickcommercialgradealuminumalloy.Twodifferentsimple-tomanufacturetoolgeometrieswereused.TheeffectofvaryingweldingparametersanddwelltimeofFSWtoolonmechanicalpropertiesandweldqualitywasexamined.Itwasobservedthatinordertoachieveadefectfreeweldingonsuchthickaluminumalloyplates,toolhavingtrapezoidalpingeometrywassuitable.Adequatetensilestrengthandductilitycanbeachievedutilizingacombinationofhightoolrotationalspeedofabout2000r/minandlowspeedofweldingaround28mm/min.Atverylowandhighdwelltimetheductilityofweldedjointsarereducedsignificantly.