雙絲交—直流脈沖電弧協調控制法研究.pdf

1、天津大學碩士學位論文雙絲交—直流脈沖電弧協調控制法研究姓名：曲丹申請學位級別：碩士專業(yè)：材料加工工程指導教師：李桓20070501ABSTRACTAftermorethanhalfacenturynarrowgrooveweldingexperiencednonGMAWtoGMAWdevelopmentOnthecurrenttechnicallevel，thedoublewiresubmergedarcnarrowgrooveweld

2、ingtechnologyinventedbyHarbinWeldingInstitutewasrecognizedbythemarketThroughtheanalysisforthenarrowgrooveweldingwefoundthatthedoublewiresubmergedarcnarrowgrooveweldingtechnologymentionedabovedidn’tmakethemostoftheinterac

3、tionofthetwoarcsAccordingtoelectromagnetismandweldingarcphysicstheory，iftwoclosearCSareelectrifiedthesamedirectioncurrent，theywillbemutuallyattractive，iftheyareelectrifiedtheoppositedirectioncurrent，theywillbemutuallyrep

4、ulsiveThemagnitudeoftheattractionandtherepulsionisproportionaltotheproductofthetwoarcs，currentinverserationtothedistancebetweenthetwoarcsandalsohasrelativewiththeangleAimedatimprovingthecommonbadfusionofthesidewallinthed

5、oublewirenarrowgroovewelding，thispaperproposedtomakeuseoftheinteractionofthetwoarcsinthedoublewirenarrowgroovewelding，onearcadoptedinverseDCsource，anotheradoptedACsourceResorttotheweldingvoltageexaminecircuitandpulsesyne

6、rgiccontrol，whenthevoltageofDCsourceisthesamedirectionwiththevoltageofACsource，thevoltageisthebasevalue，inreversethevoltageisthepeakvalueSotherepulsionbetweenthetwoarcsisthebiggestwhiletheattractioniSthesmallestTheattrac

7、tionandrepulsionbetweenthetwoarcsarecontrolledinreasonatleastonewirebending，itcanincreasetheefficiencyandalsoimprovethebadfusionofthesidewallThepulsedcontrollerhasbeendesignedbasedontheexistedcontrolleranddevelopedincomb

8、inationwithelectronictechnologyautomationtheoryandMCUtechnologyThecontrollediSaddedtheACweldingvoltageacrosszerocircuittomakesuretheDCweldingvoltagevarietyinphasewiththeACweldingvoltageandtocontroltheattractionandrepulsi

9、onbetweenthetwoarcsDuringtheweldingprocess，photoelectricsignaltestingandanalyzingsystemisappliedforelectricsignalsamplingsuchasweldingcurrent，voltagewaveformandSOonBesides，highspeedphotographisusedinstepofelectricsignals