Liccoln WPHB - Section 10 (Welding Copper and Copper Alloys)

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1、Section10WELDINGCOPPERANDCOPPERALLOYSSECTION10.1WELDINGCOPPERANDCOPPERALLOYSPageWeldabilityofCopperAlloys...........10.1·1WeldingCopperandItsAlloyswithManualShieldedMetalArcElectrodes........10.1-1WeldingCopperandCopperAlloysbytheGasMetal-ArcProcess...............10.1-5WeldingCopperandCo

2、pperAlloysbytheGasTungsten-ArcProcess............10.1-6WeldinCopperandCopperAlloysbytheCarbon-ArcProcess.................10.1-710.1-1WeldingCopperandCopperAlloysCopper,oneofthebestmetalsforconductingatmospheredoweldsinoxygen-freecopperexhibitheatandelectricity,isalsofairlyreactivechemica

3、lly,significantimprovementsinqualityoverweldsinparticularlyinrespecttooxygen.Yet,itisproducedelectrolyticcopper.andsoldinoneofthepurestformsofanycommercialTheaffinityofcopperforoxygenisonlyonemetal.Ordinarytough-pitchorelectrolyticcopperofseveralcharacteristicsthatmakeweldingdifficult.is

4、99.9+%pure,withabout0.05%copperoxideEventhoughcoppermeltsatamuchlowertemperaturedistributedthroughoutthemetalasacopper-oxidethansteel(1980'Fversus2775'F),ittakeslongereutectic.Duringwelding,themigrationofcoppertomeltasectionofcopperthananequivalentoxidetothegrainboundariestendstocauselos

5、ssectionofsteelwiththeelectricarc.Thisresultsofductilityoftheotherwisehighlyductilematerial.fromthehighthermalconductivityofcopper-Theabsorptionofcarbonmonoxideandhydrogenaboutfivetimesthatofsteel.Whenweldingcopper,attemperaturesabove1300'F,withresultantreactionthemetaladjacenttothewelda

6、readrawsawaywithcopperoxidetoformcarbondioxideandwaterheataboutasfastasitisintroduced.Notuntilthevapor,alsocomplicatestheweldingofcopperbyadjacentmetalisadequatelyheateddoesthespotcausinginternalcrackingandembrittlement.Asbeingweldedreachthemeltingpoint.ThehighindicatedinTable10-1-Applic

7、abilityofFourthermalconductivityofcopper,thus,usuallymakesWeldingProcessestoCopperandItsAlloys,onlypreheatingnecessarywhenwelding.poortofairweldqualityisobtainablewiththeCopperalsohasahighercoefficientofexpansionmanualshieldedmetal-arcelectrode,gasmetal-arc,thansteel.This