机械英文论文7.pdf

Availableonlineatwww．sciencedirect．com Transactionsof Direct NonferrousM etals SocietyofChina ELSEv1ER Press Trans．NonferrousMet．Soc．China20(2010)1387—1391 W W W ．tnm sc．cn Mechanicalpropertiesofunderwaterfrictionstirwelded 2219aluminum alloy 静 LIUHui-jie(；~jI会杰)，ZHANGHui-jie(~会杰)，HUANGYong．xian(黄永宪)，YULei(T雷) 静 窘 一蒂 蓥 StateKeyLaboratoryofAdvancedWeldingProductionTechnology， 矿 HarbinInstituteofTechnology，Harbin150001，China S ● ●■● Received15September2009；accepted24December2009 C e n Abstract：Underwaterfriction stirwelding of2219 aluminum alloy was carried outin orderto furtherimprovethe jpint C performancesbyvaryingweldingtemperaturehistory．Theresultsindicatedthatthetensilestrengthoftheipintcanbeimproved e from 324MPaby externalwatercoolingaction innormalto341MPa．However theplasticityoftheipintisdeteriorated．The , underwateripinttendstorfactureattheinterfacebetweentheweldnuggetzoneandthethermalmechanicallyaffectedzoneonthe advancingsideduringtensiletest，whichissignificantlydifferentfrom thenormalipint． Keywords．aluminum alloy；undewr aterfrictionstirwelding；mechanicalproperty impr