1、December 2015 English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.160.20!%JwT“2398449www.din.d
2、eDIN EN ISO 6848Arc welding and cutting Nonconsumable tungsten electrodes Classification (ISO 6848:2015);English version EN ISO 6848:2015,English translation of DIN EN ISO 6848:2015-12Lichtbogenschweien und -schneiden Wolframelektrode Einteilung (ISO 6848:2015);Englische Fassung EN ISO 6848:2015,Eng
3、lische bersetzung von DIN EN ISO 6848:2015-12Soudage et coupage larc lectrodes non consommables en tungstne Classification (ISO 6848:2015);Version anglaise EN ISO 6848:2015,Traduction anglaise de DIN EN ISO 6848:2015-12SupersedesDIN EN ISO 6848:2005-03www.beuth.deDocument comprises 16 pagesDTranslat
4、ion by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.12.15 DIN EN ISO 6848:2015-12 2 A comma is used as the decimal marker. National foreword This document (EN ISO 6848:2014) has been prepared by Technical Committee ISO/TC 44 “Welding and allied
5、processes” (Secretariat AFNOR, France) in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Schweien und verwandte Verfahren (DIN Standards Committee Welding an
6、d Allied Processes), Working Committee NA 092-00-03 AA Schweizustze (DVS AG W 5). The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 80000-1:2009 DIN EN ISO 80000-1:2013-08 Amendments This standard differs from DIN EN ISO 6848:2005-03 as foll
7、ows: a) requirements for classification symbol WG have been included in Table 1; b) in Table 1, the percentage by mass of impurities has been reduced from 0,5 max. to 0,1 max.; c) except for classification symbol WG, all symbols shall now be written without a space (see Table 1); d) for the colour m
8、arking of electrodes, more than one colour ring and colour combination may now be used (see Clause 7); e) a new Subclause 9.2 “Electrode finish” has been included; f) Clause 9 “Electrode shape and condition” including Subclauses 9.1 “Electrode straightness” (previously 8.3), 9.2 “Electrode finish” (
9、previously 8.4) and 9.3 “Electrode quality” (new) has been introduced; g) Clause 12 “Classification examples” has been introduced; h) Table A.2 “Approximate current ranges depending on the electrode diameter” has been completely revised; i) normative references have been updated. Previous editions D
10、IN 32528: 1977-01 DIN EN 26848: 1991-10 DIN EN ISO 6848: 2005-03 National Annex NA (informative) Bibliography DIN EN ISO 80000-1:2013-08, Quantities and units Part 1: General (ISO 80000-1:2009 + Cor 1:2011)EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6848 September 2015 ICS 25.160.20 Sup
11、ersedes EN ISO 6848:2004English Version Arc welding and cutting - Nonconsumable tungsten electrodes - Classification (ISO 6848:2015) Soudage et coupage larc - lectrodes non consommables en tungstne - Classification (ISO 6848:2015) Lichtbogenschweien und -schneiden - Wolframelektrode - Einteilung (IS
12、O 6848:2015) This European Standard was approved by CEN on 11 December 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibli
13、ographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the respons
14、ibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Repub
15、lic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALI
16、SATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6848:2015 EForeword .4Introduction 51 Scope . 62 Normative references 6
17、3 Classification 64 Symbols and requirements 64.1 Symbol for the product/process 64.2 Symbol for the chemical composition . 65 Chemical analysis . 66 Retests . 67 Marking 78 Standard sizes and tolerances 88.1 Electrode diameters . 88.2 Electrode lengths 99 Electrode shape and condition . 109.1 Elect
18、rode straightness . 109.2 Electrode finish 109.3 Electrode quality 1010 Rounding procedure 1011 Marking and packaging 1011.1 Marking 1011.2 Packaging 1112 Classification examples 11Annex A (informative) Conditions of use 12Contents PageDIN EN ISO 6848:2015-12 EN ISO 6848:2015 (E) 2European foreword
19、.3European foreword This document (EN ISO 6848:2015) has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding and allied processes” the secretariat of which is held by DIN. This European Standard shall be given th
20、e status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2016, and conflicting national standards shall be withdrawn at the latest by March 2016. Attention is drawn to the possibility that some of the elements of this document may be the s
21、ubject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 6848:2004. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and sup
22、ports essential requirements of EU Directive(s). According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, F
23、ormer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 684
24、8:2015 has been approved by CEN as EN ISO 6848:2015 without any modification. DIN EN ISO 6848:2015-12 EN ISO 6848:2015 (E) 3 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internationa
25、l Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO,
26、also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1
27、. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elem
28、ents of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations receive
29、d (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adhere
30、nce to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 44, Welding and allied processes, Subcommittee SC 3, Welding consumables.This third edition cancels and replaces the sec
31、ond edition (ISO 6848:2004), which has been technically revised.DIN EN ISO 6848:2015-12 EN ISO 6848:2015 (E) 4 IntroductionTungsten electrodes are used in a variety of welding and allied processes, including tungsten inert gas welding, plasma arc welding and cutting, plasma spraying, and atomic hydr
32、ogen welding. In contrast to most other welding electrodes, tungsten electrodes are not intended to become part of the weld deposit. Nevertheless, the chemical composition of a tungsten electrode has an important effect on its range of usage in welding and allied processes. Therefore, tungsten elect
33、rodes are classified according to their chemical composition.Requests for official interpretations of any aspect of this International Standard should be directed to the Secretariat of ISO/TC 44/SC 3 via your national standards body. A complete listing of national standards bodies can be found at ww
34、w.iso.org.DIN EN ISO 6848:2015-12 EN ISO 6848:2015 (E) 5 1 ScopeThis International Standard specifies requirements for classification of nonconsumable tungsten electrodes for inert gas shielded arc welding, and for plasma welding, cutting and thermal spraying.Information on conditions of use of thes
35、e electrodes is given in Annex A (informative).2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition o
36、f the referenced document (including any amendments) applies.ISO 80000-1:2009, Quantities and units Part 1: General3 ClassificationClassification of a tungsten electrode is based upon its chemical composition.4 Symbols and requirements4.1 Symbol for the product/processThe symbol for gas shielded tun
37、gsten arc processes is the letter W.4.2 Symbol for the chemical compositionThe symbol for the chemical composition of the tungsten electrode is the chemical symbol(s) for the principal oxide additive(s) followed by digits indicating the nominal mass percent of the oxide additive multiplied by 10. If
38、 there is no additive, the symbol is the letter P. Table 1 lists the composition requirements for the various classifications.5 Chemical analysisChemical analysis shall be performed on specimens of the electrode being classified. Any analytical technique may be used but, in cases of dispute, referen
39、ce shall be made to established published methods.6 RetestsIf any test fails to meet the requirement, that test shall be repeated twice. The results of both retests shall meet the requirements. Specimens for retesting may be taken from the original test specimen or from a new test specimen. For chem
40、ical analysis, retests need only be for those specific elements that failed to meet their test requirement. If the results of one or both retests fail to meet the requirement, the material under test shall be considered as not meeting the requirements of this specification for that classification.DI
41、N EN ISO 6848:2015-12 EN ISO 6848:2015 (E) 6 In the event that, during preparation or after completion of any test, it is clearly determined that prescribed or proper procedures were not followed in preparing the test specimen or test specimen(s), or in conducting the tests, the test shall be consid
42、ered invalid, without regard to whether the test was actually completed, or whether the test results met, or failed to meet, the requirement. That test shall be repeated, following proper prescribed procedures. In this case, the requirement for doubling the number of test specimens does not apply.7
43、MarkingTungsten electrodes 50mm in length and above, as manufactured, shall be marked on the basis of their chemical composition, with one or more colour rings near one end of the electrode in accordance with Table 1.The width of the colour rings shall be at least 3 mm. Alternatively, tungsten elect
44、rodes may have their classification symbols marked on the surface of the electrode near at least one end of the electrode.For tungsten electrodes shorter than 50 mm in length, as manufactured, packaging shall be marked in accordance with Clause 11.Table 1 Chemical composition requirements for tungst
45、en electrodesClassifica-tion symbolChemical composition requirementsColour code,RGB colour value and col-our sampleaOxide addition Impurities, mass percentTungsten, mass percentPrincipal oxideMass percentWP None 0,1 max. BalanceGreen#008000WCe20 CeO21,8 to 2,2 0,1 max. BalanceGrey#808080WLa10 La2O30
46、,8 to 1,2 0,1 max. BalanceBlack#000000WLa15 La2O31,3 to 1,7 0,1 max. BalanceGold#FFD700WLa20 La2O31,8 to 2,2 0,1 max. BalanceBlue#0000FFWTh10 ThO20,8 to 1,2 0,1 max. BalanceYellow#FFFF00aRGB colour values and colour samples can be found at: https:/ not listed in this table are symbolized by the lett
47、ers WG, followed by the chemical symbol(s) and digits for the major oxide additive(s) in accordance with the principle used for the other compositions.DIN EN ISO 6848:2015-12 EN ISO 6848:2015 (E) 7 Classifica-tion symbolChemical composition requirementsColour code,RGB colour value and col-our sample
48、aOxide addition Impurities, mass percentTungsten, mass percentPrincipal oxideMass percentWTh20 ThO21,7 to 2,2 0,1 max. BalanceRed#FF0000WTh30 ThO22,8 to 3,2 0,1 max. BalanceViolet#EE82EEWZr3 ZrO20,15 to 0,50 0,1 max. BalanceBrown#A52A2AWZr8 ZrO20,7 to 0,9 0,1 max. BalanceWhite#FFFFFFWG bThe manufacturer shall identify a
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