預(yù)拉伸焊接控制鋁合金薄板焊接變形和殘余應(yīng)力.pdf

1、江蘇科技大學(xué)碩士學(xué)位論文預(yù)拉伸焊接控制鋁合金薄板焊接變形和殘余應(yīng)力姓名：章明明申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：李敬勇20050322AbstractiiPretensionweldingcontrolthedisttionresidualstressesofaluminumalloysheetplatesAbstractThedisttionresidualstressesofaluminumisoneofthemaine

2、ffectfactsofwideusinginindustry.Thepretensionstressesarebeusedinthisdissertation.ByusingpretensionweldingAdjustingtheinteriimbalancestressesarousedbytheheatinfectofweldingthepretensionweldingcanultimatelycontrolthefactof

3、arousingthewelddisttionresidualstressesthentheaimofcontrollingdisttionresidualstressesafterweldingcanbegot.Bydesigningaspecialweldinstallationcanbringpretensionstressesisbemadegettheaimofpretensionwelding.Duringthecourse

4、ofweldingusingTIGweldingbasedonchoosingdifferentpretensionparametersintheelasticitydisttionscope.The5A05aluminumplateswith4mmthicknessareweldedunderpretensionstresses.themeasuredataoflongitudinalwrapdisttion、planedisttio

5、nresidualstressesareevaluatedanalyzed.Thefollowingresultshavebeengot.Pretensionweldingcanreduceeffectivelythelongitudinalwarpplanedisttion.Theexperientialresultsshowthatthemaximumreductionrangeoflongitudinalwarpdisttionr

6、each68.8％atthesametimetheplanedisttionreachabout83％.Comparedtotheconventionalweldingtherangeofresidualstressesarebereducedbythepretensionweldingthentheaimofcontrollingtheresidualstressesresidualdisttionarebereachedtoo.Th

7、isdissertationanalysesthemainmechanismofthecontrollingweldingdisttionafterweldresidualstressesbypretensionwelding.Itisconsideredthatpretensionstressesenlargetheplasticdisttionregionunderhightemperaturestatethenreducethep

8、lasticcompressstressunderhightemperature.Duringthelatercoolingcoursethecontaindrawingstressstrengthentheabilityofplasticdrawingstressthelongitudinalplasticdrawingfmedinthecoolingcoursecanmainlyoffseteliminatethecompresss