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1、焊接工艺参数（Theweldingprocessparameters）ThechoiceoftheweldingparametersHttp://www.scutde.net/t14courses/1412-efmdljiaif/gangjiegou/9.HTMManualelectricarcweldingparametersincludeelectrodediameter,weldingcurrent,arcvoltage,weldinglayers,powertypeandpolarityetc..
2、1.electrodediameterSelectthediameterofelectrodemainlydependsonthethicknessofweldingjointform,weldingpositionandweldingleveletc..Ingeneral,accordingtotable6-4accordingtotheweldingthicknesschoiceofelectrodediameter,andtendtochoosethelargerdiameteroftheelect
3、rode.Inaddition,intheflat,largediameter;welding,theelectrodediameterislessthan5mm;horizontalweldingandoverheadwelding,withadiameterofnotmorethan4mm;groovemultilayerwelding,inordertopreventthedefectsoflackofpenetration,thefirstweldingseamshouldadopt3.2mmdi
4、ameterelectrode.Table6-4mmrelationshipbetweenthediameterofelectrodeandweldingpiecesofthicknessWeldingthicknessLessthanorequalto23~45~12>12ElectrodediameterTwoThreepointtwo4~5Morethan152.weldingcurrentTheweldingcurrentistoolargeortoosmallwillaffecttheweldi
5、ngquality,sothechoiceshouldbebasedontheelectrodetype,diameter,thickness,weldingjoints,weldlocationandotherfactorstoconsider,theelectrodediameterandweldpositionisthekey.Ingeneraltheweldingsteelstructure,weldingcurrentandelectrodediameterrelationshipformula
6、wasselectedfollowingexperienceavailable:I=10d2(6-1)TypeI-weldingcurrent(A);D-electrodediameter(mm).Inaddition,welding,weldingcurrentshouldbehigherthanthesmall15%~20%;horizontalweldingandoverheadwelding,weldingcurrentshouldbehigherthanthecurrent10%to15%.3.
7、arcvoltageAccordingtothecharacteristicsofthepowersupply,weldingcurrentandarcvoltagedecidedbythecorresponding.Inaddition,thearcvoltageandarclength.Longarcarcvoltage,arcshortarcvoltagelow.Generalrequirementsforarclengthislessthanorequaltothediameterofelectr
8、ode,shortarcwelding.Inacidicweldingwhenusedtopreheatthepartsorreducethetemperatureofthemoltenpool,sometimeswillbeslightlyelongatedarcwelding,whichiscalledarcwelding.4.weldinglayersWeldinglayersshouldbeconsidereddepe
