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1、EUROPEANSTANDARDEN439NORMEEUROPEENNEEUROPAISCHENORMAugust1994UDC621.791.04-403:621.791.754Descriptors:welding,arcwelding,gasshieldedwelded,gases,gazmixtures,classifications,designation,chemicalpropertiesEnglishversionWeldingconsumables-Shieldinggasesf
2、orarcweldingandcuttingProduitsconsommabiespour1esoudage-Gazdeprotectionpourlesoudageetlecoupagea1"arcSchweißzusätze-SchutzgaseLichtbogenschweißenundSchneidenThisEuropeanStandardwasapprovedbyCENon1994-08-17.CENmembersareboundtocomplywiththeCEN/CENELECIn
3、ternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyC
4、ENmember.TheEuropeanStandardsexistinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusastheofficialversions.CENme
5、mbersarethenationalstandardsbodiesofAustria,Belgium,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom.-,CENEuropeanCommitteeforStandardizationComiteEuropeendeNorma
6、lisationEuropäischesKomiteefürNormungCentralSecretariat:ruedeStassart,36B-1050Brussels1994CopyrightreservedtoCENmembersRef.No.EN439:1994EPage2EN439:1994ContentsForeword31Scope'42Propertiesofgases43Classificationofshieldinggases44Designation55Tolerances
7、ofmixtures56Puritiesanddewpoint57Formsofsupply67.1Gascylinders67.2Liquid68Shieldinggasidentification6Page3EN439:1994ForewordThisEuropeanStandardhasbeenpreparedbytheTechnicalCommitteeCEN/TC121"Welding",thesecretariatofwhichisheldbyDS.ThisEuropeanStandard
8、shallbegiventhestatusofaNationalStandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbyFebruary1995,andconflictingnationalstandardsshallbewithdrawn.atthelatestbyFebruary1995.AccordingtotheCEN/CENELECInternalReg
