Designation:A1065/A1065M−15StandardSpecificationforCold-FormedElectric-Fusion(Arc)WeldedHigh-StrengthLow–AlloyStructuralTubinginShapes,with50ksi[345MPa]MinimumYieldPoint1ThisstandardisissuedunderthefixeddesignationA1065/A1065M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThisspecificationcoversthreeTypesandtwoGradesofcoldformedelectric-fusion(arc)weldedhigh-strengthlow-alloysteeltubingof50ksi[345MPa]minimumyieldpointforuseinweldedorboltedconstructionofbuildingsandforgeneralstructuralpurposes.1.2Thistubingisproducedinsquareandrectangularsizeswithaperipheryof200in.[500cm]orlessandaspecifiedwallthicknessof1.00in.[25mm]orless.Tubesarejoinedbytwolongitudinalelectric-fusion(arc)welds.Circumferentialweldsaredisallowed.SizesoutsideofthoselistedinTables4and5maybeorderedprovidedallotherrequirementsofthespeci-ficationaremet.Typicallengthsare15to50ft.[5to15m].NOTE1—Productsmanufacturedtothisspecificationmaynotbesuitableforthoseapplicationssuchasdynamicallyloadedelementsinweldedstructures,etc.wherelow-temperaturetoughnesspropertiesmaybeimportant.(SeeSupplementaryRequirementS1.)1.3ThisspecificationcoversthefollowingTypes:1.3.1Type1—Weldedwithbacking,backingleftintheproduct,1.3.2Type2—Weldedwithbacking,backingremoved,1.3.3Type3—Weldedwithoutbacking.1.4TubingisavailableinGrades50[345]and50W[345W].Grade50[345]ismanufacturedfromhigh-strengthlow-alloysteel.Grade50W[345W]ismanufacturedfromhigh-strengthlow-alloysteelwithenhancedatmosphericcor-rosionresistance.(See10.1.2)TheGradesmaynotbeinter-changedwithoutapprovalofthepurchaser.ASTMSpecifica-tionsforplatethatmaybeappliedtoGrade50[345]and50W[345W]arelistedinReferenceDocumentsandinTable1.1.5Thisspecificationisexpressedinbothinch-poundunitsandinSIunits;however,unlessthepurchaseorderorcontractspecifiestheapplica...
