感应加热消除不锈钢管焊接应力数值模拟林涛，陈怀宁，刘英(1．中国科学院金属研究所，辽宁沈阳110016；2．中国水利水电一局安装分局，吉林吉林130062)摘要：利用温差产生的协调形变解决小直径不锈钢管道焊接接头应力腐蚀问题是一种快捷而有效的方法，虽然采用火焰加热形成的温差可以得到一定的消除应力效果，但可控性差，不利于现场实施。提出一种新的温差形成技术——感应加热处理。利用有限元数值模拟，对直径100mm的不锈钢小径管环缝焊接接头的残余应力及感应加热法消除焊接应力效果进行了研究，得到了线圈位置、加热频率、加热电流、加热时间等工艺参数对消除焊接应力效果的影响规律以及最佳工艺参数的选取原则。结果表明，感应加热法弥补了火焰加热法的不足，在焊缝内表面获得压应力的同时，可以将加热区的新增应力控制在母材屈服强度的一半以内。关键词：感应加热；不锈钢小径管；消除焊接残余应力；温差协调形变法中图分类号：TG457．6文献标识码：A文章编号：1001—4837(2009)05-0038—06doi：10．3969／j．issn．1001—4837．2009．05．007SimulationofRelievingWeldingResidualStressesintheGirth——weldStainlessSteelTubebyInductionHeatingMethodLINTao，CHENHuai—ning。LIUYing(InstituteofMetalResearch，ChineseAcademyofSciences，Shenyang110016，China；2．SinohydroBu—reauico．，Ltd．，Jilin130062，China)Abstract：Thestresscorrosioncrackinginweldedstainlesssteeltubeswithsmall—diameterismainlyre-latedtotheweldingresidualstressesinthegirth—weld．Aquickandeffectivewaytofixtheproblemisthecompatibledeformationmethodfromtemperature—diffefence．Theweldingresidualstressesintubescanberelievedtosomeextentbyusingtheflameheatingprocesswhichproducesatemperaturediffer’ence，buttheprocessisnotconvenientappliedtoindustrybecauseofitspoorcontrollablefeature．Anewtemperature—differenceformationtechnology—inductionheatingtreatmentwaspresentedhere．ByFEMana1sis，weldingresidualstressesandtheprocessofinductionheatingforstressreliefweresimulatedonlo0mmdiameteroftube．Itindicatestheeffectsofsomefactorssuchasthelocationofheatingcoil，heat—ingfrequency，heatingcurrentandheatingtimeOilthestressrelief．Thechoosingprincipleoftheoptimalparameterwasalsoprop0sed．Theresultsshowthattheinductionheatingmethodmayeffectivelycovertheshortageoftheflameheatingmethod．Apartfromrapidandconvenient，thecompressivestressesmaybeobtainedontheinnersurfaceofthegirth—weldaslowertensileresidualstresses(notmorethan1／2yieldstrength)existedintheheatingarea．Keywords：inductionheating；small—diameterstainlesssteelrelievingweldingresidualstresses；·38·第26卷第5期压力容器第198期te