ElectroslagStripSurfacingisaweldingprocessdevelopedonthebasisofStripSubmergedArcWelding.Itutilizestheresistanceheatofelectricallyconductivemoltenslagtomeltthebasematerialandtheweldingstrip.Hereisadetailedintroduction:###Principle-First,anarcisignitedbetweentheelectrodeandthebottomoftheweldment.Thearcheatisusedtomeltthefluxtoformaslagpool.Afterthearcextinguishes,theheatsourcetransitionsfromarcheattotheresistanceheatofthemoltenslag.-Themoltenmetal,withahigherdensity,sinkstoformaliquidmetalpool,whilethemoltenslag,withalowerdensity,floatsontopofthepool.Theslagpoolcoversthesurfaceofthemetalpool,protectingitfrombeingcontaminatedbytheatmosphere.-Astheelectrodecontinuouslymelts,theliquidmetalandmoltenslaginthepoolrise.Thelower-partliquidmetal,whichisfartherawayfromtheheatsource,solidifiesintoasurfacinglayerundertheforcedcoolingofthewater-cooledformingjacket.###Characteristics-**Highdepositionrate**:Thedepositionrateisincreasedby60%-80%comparedwithStripSubmergedArcWelding.-**Lowdilutionrate**:Itcanreducethedilutionbyupto50%comparedwithStripSubmergedArcWeldingunderthesameheatinput.-**Fastweldingspeed**:Theweldingspeedisincreasedby50%-200%,resultinginanincreasedcoveragearea.-**Goodqualityofsurfacinglayer**:Thesolidificationrateoftheweldmetalisverylow,whichisconducivetotheescapeofgasporesandreducesporedefects.Theoxygeninthemoltenslagpoolcanescapetothesurface,andthesurfaceofthesurfacinglayermetalisquiteclean.Fromametallurgicalpointofview,thetendencyofhotcrackingandintergranularcorrosionisreduced.-**Highcurrentandcurrentdensity**:Fora60-mm-wideweldingstrip,thecurrentis1000-1250A,andthecorrespondingcurrentdensityis33-42A/mm².High-speedfluxesallowtheweldingcurrenttoexceed2000A,withacorrespondingcurrentdensityof70A/mm².###ProcessParameters-**Electrodeattitude**:Theelectrodeisusuallyperpendiculartotheworkpieceandperpendiculartotheaxisofitsmovement.Rotatingtheelectrodearounditslongitudinalaxistoacertainextentwillresultinanarrowerandthickerweldbead.-**Spacingofcurrentcontact**:Thedistancefromtheloweredgeofthecontactjawstotheworkpiecesurfaceisgenerallyabout30mm.-**Fluxdepth**:Thedepthofthefluxdeterminesthewidthoftheslaglayer.Ifthefluxistooshallow,theslagpoolwillbetooshallow,resultinginincreasedarcingofthestrip.Ifthefluxistoodeep,thefluxwillonlymeltinthemiddle,andtheslagpoolwillbecooledbytheoverlyingflux,leadingtoadecreaseinelectricalconductivityandincreasedarcing.Thenormaldepthis30mm.-**Currentdensity**:Duetotheabsenceofanarc,thepenetrationoftheElectroslagStripSurfacingprocessisveryshallow,whichmeansthatthereislittlemixingofthefillermetalwiththemoltenbasematerial.Therefore,higherpowerlevelscanbeusedcomparedwithStripSubmergedArcWelding.###ApplicationThisprocessismainlyusedinindustriessuchaspetroleum,chemical,pulp,andenvironmentalprotection.Itisusedtodeposithigh-alloycladdingonthesurfaceofnon-alloyorlow-alloybasematerialstoimprovethecorrosion-resistanceandwear-resistanceperformanceofcomponents.Itisparticularlysuitableforthesurfacesurfacingoflarge-areacomponents,suchastheinnersurfacesofpressurevesselsandreactors.