A study on resistance welding in steel sheets using

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1、JournalofMaterialsProcessingTechnology101(2000)186±192Astudyonresistanceweldinginsteelsheetsusingatailor-weldedblank(1streport)Evaluationofupsetweldabilityandformability*K.B.Min,K.S.Kim,S.S.KangSchoolofMechanicalEngineering,EngineeringResearchCenterforNetShapeandDieManufacturing,PusanNationalUnivers

2、ity,Pusan609-735,SouthKoreaReceived9October1998AbstractApressformabilityanalysisofweldedpartswasstudiedinthecurrentwork,usingatailor-weldedblank.Forabodypanelproducedbythepressformingofpartsweldedbythetailor-weldedblankmethod,thefollowingconditionsaredemanded:(1)Thestrengthoftheweldedpartsmustbehigh

3、erthanthoseofthebasemetals.(2)Afterthewelding,severeweldingdeformationmustbeavoided.(3)Thepressformabilityoftheweldedpartsissimilartothatofthebasemetals.(4)Thereproductibilityoftheweldingmustbehigh.Therearenumerousweldingmethodssatisfyingtheseconditions,butthepurposeofthisstudyistoinvestigatetheupse

4、tweldabilityandformabilityofaparticularkindofmaterial(SPCC).SPCCsteelsheetshowsgoodweldabilityandformabilityundersomeweldingconditions.Theexperimentalresultsarediscussedbytheevaluationoftheresultsobtainedfromthetensiletest,thehardnesstest,themicrostructureandtheErichsencuptest.Theformabilityofupsetw

5、eldedSPCCsteelsheetasevaluatedbytheErichsencuptestwaslittlelowerthanthatoftheparentmaterial.#2000PublishedbyElsevierScienceS.A.Allrightsreserved.Keywords:Tailor-weldedblank;Upsetweldability;Pressformability;Hardnessdistribution;Erichsencuptest1.Introductionlessthanthatofthecammethod)andthereisalsoth

6、epossibilityof®reandenvironmentalpollution.Further,dustAnupsetweldcanbedoneathighspeedandissuitablepenetrationofthejointpartmustbeeliminatedfortheformassproduction,consideringthequalityandproductiv-promotionofautomation.Thesteelrimisabout3mmthickityoftheweldingzone.Lately,alongwith¯ashwelding,theand

7、200mmwideandhasrelativelylargecross-sectional2advancedautomobileindustriesoftheUSAandJapanhaveareaofabout600mm,sothatithasbeenconsideredtobebeenadoptingtheupsetweldingofatailor-weldedblank.impossiblet