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1、南京理工大學(xué)碩士學(xué)位論文鎂合金熔化極氣體保護(hù)焊焊接工藝與性能分析研究姓名:劉珍良申請學(xué)位級別:碩士專業(yè):材料加工工程指導(dǎo)教師:王克鴻20100625AbstractButtweldingexperimentson4mmwroughtmagnesiumalloyhavebeendonebyMIG、)~reldingprocessinthisthesisTheexperimentadoptsthemethodofpulseMIGweldin

2、gwithSinglewiretoanalysehowtheweldingparameterssuchascurrentandvoltage、行equency、backgroundcurrent、peakcurrentandweldingspeedinfluencethesizeofweldingseamExperimentshavebeendonebychoosingproperweldingparameterscombination

3、onpulseMIGweldingwithsinglewirewecangetgoodshapeofweldingseamInthecaseofchoosingsquaregrooveandnogapwelding,wecallgetone—sideweldingwithbackfonnationOnthebesttechnicalcondition,theaveragestrengthofthejointCallreach237MPa

4、anditis93%ashardasthatofthebasemetalontllebasisofthis,comparedwithpulseMIGweldingwithsinglewire,ifadoptingtandemMIGweldingandincreasing90%averagecurrent,wecallraise143%weldingspeedandfurtherimprovethequalityofweldingFore

5、xample,wecangetstableweldingcurrent,littlespattergoodweldingseam,averagearrangingrootpenetration,andsmallweldingdeformationOntheoptimumtechnicalconditiontheaveragestrengthofthejointcanreach240MPaanditis93%ashardasthatoft

6、hebaSemetalTbtlle4mmwroughtmagnesiumalloybyMIGwelding,thebestweldingtechniquesarethefollowing:whenadoptingpulseMIGweldingwithsinglewire,thecurrentis160A,thevoltageis244Vandtheweldingspeedis70cm/min;whenadoptingtandemMIGw

7、elding。thecurrentofthefirstwireis159Aandthevoltageis22OV,thecurrentofthesecondwireis51Aandthevoltageis236vandtheweldingspeedis170cm/minTheexperimentresultsshowthatwithincertainwirefeedrate,theadjustingrangeofweldingcurre

8、ntandweldingspeedisverynarrowandithasagreateffectonthesizeofweldingseamTheweldingcurrenthasadirecteffectonthestabilityoftheweldingprocess,buttheweldingspeedhasalittleeffectontheweldingprocessandhasallobviouseffectonthequ

9、alityofweldingTheregulatingrangeof1jrequency、backgroundcurrentandpeakcUrrentisfairlywideanditproducesalittleimpactonthesizeofweldingseamandthestabilityoftheweldingCOtlrseItismainlyprimarya(Mg)phaseintheweldingseamareaand

10、theprecipitated丫(Mgl7A112)phaseismainlydistributedoverthecrystalboundaryThehardnessofweldingse鋤isalittlehigherthanthatofbasemetal,andthehardnessofHAZisalittlelowerthanthatofbaSemetalThenearareaofmeltinglineistheweakparto

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