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1、焊接工艺参数（Weldingprocessparameter）SelectionofweldingprocessparametersHttp://www.scutde.net/t14courses/1412-efmdljiaif/gangjiegou/9.HTMTheweldingparametersofmanualarcweldingincludeweldingroddiameter,weldingcurrent,arcvoltage,weldinglayernumber,powersupplytypeandpolarity.1.electr
2、odediameterThechoiceofelectrodediametermainlydependsonthethicknessofweldment,theformofjoint,thepositionofweldandthelevelofwelding.Ingeneral,thediameteroftheelectrodecanbeselectedaccordingtothethicknessoftheweldmentaccordingtotable6-4,andtheelectrodewithlargerdiameterisprefer
3、red.Inaddition,intheflat,largediameter;welding,theelectrodediameterislessthan5mm;horizontalweldingandoverheadwelding,withadiameterofnotmorethan4mm;groovemultilayerwelding,inordertopreventthedefectsoflackofpenetration,thefirstweldingseamshouldadopt3.2mmdiameterelectrode.Table
4、6-4relationshipbetweenweldingroddiameterandweldmentthicknessmmWeldmentthicknessLessthanorequalto23~45~12>12ElectrodediameterTwoThreepointtwo4~5Morethan152.weldingcurrentTheweldingcurrentistoolargeortoosmallwillaffecttheweldingquality,sothechoiceshouldbebasedontheelectrodetyp
5、e,diameter,thickness,weldingjoints,weldlocationandotherfactorstoconsider,theelectrodediameterandweldpositionisthekey.Intheweldingofthegeneralsteelstructure,therelationshipbetweentheweldingcurrentandthediameteroftheelectrodecanbeselectedbythefollowingempiricalformula:I=10d2(6
6、-1)TypeI-weldingcurrent(A);D-electrodediameter(mm).Inaddition,welding,weldingcurrentshouldbehigherthanthesmall15%~20%;horizontalweldingandoverheadwelding,weldingcurrentshouldbehigherthanthecurrent10%to15%.3.arcvoltageThearcvoltageisdeterminedbytheweldingcurrentaccordingtothe
7、characteristicsofthepowersupply.Inaddition,arcvoltageisalsorelatedtothelengthofarc.Thearclengthishigherthanthearcvoltage,andthearcvoltageislowwhenthearcisshort.Generally,thearclengthislessthanorequaltothediameteroftheweldingrod,thatis,shortarcwelding.Intheuseofacidweldingele
8、ctrode,inordertopreheatpartsorreducethepooltemperature,sometimesalsoslightl
