Theadjustmentoftheworkingvoltageoftheweldingmachine,inadditiontotheprimary220/380voltageconversion,thesecondarycoilalsohastapconversionvoltage,atthesametime,thereisalsotheadjustablecoretoadjusttheinputoftheironcore,themorethemagneticcircuit,themoreitenters.Thelowertheweldingvoltage.Theelectrodeusedinmanualarcweldingismadeupofcoatingandcore.Duringwelding,theelectrodeactsasanelectrode,ontheonehand,itactsasaninductivecurrentandignitesanarc,whichproducesac***tantandstablearcbetweentheelectrodeandthebasicmetaltoprovidethenecessaryheatformeltingwelding.Ontheotherhand,theelectrodeisaddedtotheweldasthefillingmetal,andbecomesthemaincomponentoftheweldmetal.Therefore,thecompositionofelectrodeandthequalityofelectrodewilldirectlyaffectthechemicalcomposition,mechanicalpropertiesandphysicalpropertiesofweldmetal.Inaddition,theweldingrodhasgreatinfluenceonthestabilityofweldingprocess,weldappearancequality,weldingproductivityandsoon.)