1、BSI Standards PublicationBS EN ISO 6848:2015Arc welding and cutting Nonconsumable tungsten electrodes ClassificationBS EN ISO 6848:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 6848:2015. It supersedes BS EN ISO 6848:2004 which is withdrawn.The UK par
2、ticipation in its preparation was entrusted to Technical Committee WEE/39, Welding consumables.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsi
3、ble for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 83848 4 ICS 25.160.20 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standar
4、ds Policy and Strategy Committee on 30 September 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6848 September 2015 ICS 25.160.20 Supersedes EN ISO 6848:2004English Version Arc welding and cutting - Nonconsumabl
5、e tungsten electrodes - Classification (ISO 6848:2015) Soudage et coupage larc - lectrodes non consommables en tungstne - Classification (ISO 6848:2015) Lichtbogenschweien und -schneiden - Wolframelektrode - Einteilung (ISO 6848:2015) This European Standard was approved by CEN on 11 December 2015. C
6、EN 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 bibliographical references concerning such national standards may be obtained on ap
7、plication 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 responsibility of a CEN member into its own language and notified to the CEN-CENELEC
8、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 Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L
9、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Ma
10、rnix 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 EBS EN ISO 6848:2015EN ISO 6848:2015 (E) 3 European foreword This document (EN ISO 6848:2015) has been prepared by Technical Committee ISO/
11、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 the status of a national standard, either by publication of an identical text or by endorsement, at
12、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 subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or a
13、ll 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 supports essential requirements of EU Directive(s). According to the CEN-CENELEC Internal Regulations
14、, 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L
15、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 6848:2015 has been approved by CEN as EN ISO 6848:2015 without any modification. BS EN ISO 6848:2015I
16、SO 6848:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Classification 14 Symbols and requirements 14.1 Symbol for the product/process 14.2 Symbol for the chemical composition . 15 Chemical analysis . 16 Retests . 17 Marking 28 Standard sizes and tolerances 38.1 Electrode diamet
17、ers . 38.2 Electrode lengths 49 Electrode shape and condition 59.1 Electrode straightness 59.2 Electrode finish . 59.3 Electrode quality . 510 Rounding procedure . 511 Marking and packaging . 511.1 Marking . 511.2 Packaging . 612 Classification examples . 6Annex A (informative) Conditions of use . 7
18、 ISO 2015 All rights reserved iiiContents PageBS EN ISO 6848:2015ISO 6848:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
19、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, also take part in the work. ISO collaborates
20、 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. In particular the different approval crite
21、ria 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 elements of this document may be the subject of
22、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 received (see www.iso.org/patents).Any trade name u
23、sed 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 adherence to the WTO principles in the Technical B
24、arriers 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 second edition (ISO 6848:2004), which has been
25、technically revised.iv ISO 2015 All rights reservedBS EN ISO 6848:2015ISO 6848:2015(E)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 hydrogen welding. In contrast
26、 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 electrodes are classified acco
27、rding 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 www.iso.org. ISO 2015 All r
28、ights reserved vBS EN ISO 6848:2015BS EN ISO 6848:2015Arc welding and cutting Nonconsumable tungsten electrodes Classification1 ScopeThis International Standard specifies requirements for classification of nonconsumable tungsten electrodes for inert gas shielded arc welding, and for plasma welding,
29、cutting and thermal spraying.Information on conditions of use of these 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 th
30、e edition cited applies. For undated references, the latest edition of 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 requirem
31、ents4.1 Symbol for the product/processThe symbol for gas shielded tungsten 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 indicatin
32、g the nominal mass percent of the oxide additive multiplied by 10. If 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. A
33、ny analytical technique may be used but, in cases of dispute, reference 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
34、from the original test specimen or from a new test specimen. For chemical 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 meet
35、ing the requirements of this specification for that classification.INTERNATIONAL STANDARD ISO 6848:2015(E) ISO 2015 All rights reserved 1BS EN ISO 6848:2015ISO 6848:2015(E)In the event that, during preparation or after completion of any test, it is clearly determined that prescribed or proper proced
36、ures were not followed in preparing the test specimen or test specimen(s), or in conducting the tests, the test shall be considered 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, fo
37、llowing proper prescribed procedures. In this case, the requirement for doubling the number of test specimens does not apply.7 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
38、of the electrode in accordance with Table 1.The width of the colour rings shall be at least 3 mm. Alternatively, tungsten electrodes 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 lengt
39、h, as manufactured, packaging shall be marked in accordance with Clause 11.Table 1 Chemical composition requirements for tungsten electrodesClassifica-tion symbolChemical composition requirementsColour code,RGB colour value and col-our sampleaOxide addition Impurities, mass percentTungsten, mass per
40、centPrincipal oxideMass percentWP None 0,1 max. BalanceGreen#008000WCe20 CeO21,8 to 2,2 0,1 max. BalanceGrey#808080WLa10 La2O30,8 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. Balance
41、Yellow#FFFF00aRGB colour values and colour samples can be found at: https:/ not listed in this table are symbolized by the letters 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.2 ISO 2015 All rights
42、reservedBS EN ISO 6848:2015ISO 6848:2015(E)Classifica-tion symbolChemical composition requirementsColour code,RGB colour value and col-our sampleaOxide addition Impurities, mass percentTungsten, mass percentPrincipal oxideMass percentWTh20 ThO21,7 to 2,2 0,1 max. BalanceRed#FF0000WTh30 ThO22,8 to 3,
43、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 all additions and their nominal quantity0,1 max. BalanceAny colour or combination of colours not already used in this International Sta
44、ndardaRGB colour values and colour samples can be found at: https:/ not listed in this table are symbolized by the letters 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.8 Standard sizes and tolerance
45、s8.1 Electrode diametersStandard electrode diameters and tolerances are given in Table 2. Other diameters and tolerances may be as agreed between supplier and purchaser.Electrodes should fit through ring gages sized for their maximum allowable diameter in accordance with Table 2.Table 1 (continued)
46、ISO 2015 All rights reserved 3BS EN ISO 6848:2015ISO 6848:2015(E)Table 2 Standard electrode diameters and tolerancesNominal Diameter mmTolerance mm0,25 0,020,30 0,020,50 0,051,0 0,051,5 0,051,6 0,052,0 0,052,4 0,12,5 0,13,0 0,13,2 0,14,0 0,14,8 0,15,0 0,16,3 0,16,4 0,18,0 0,110,0 0,18.2 Electrode le
47、ngthsStandard electrode lengths and tolerances are given in Table 3. Other lengths and tolerances may be as agreed between supplier and purchaser.Table 3 Standard electrode lengths and tolerancesNominal length mmTolerance mm50 1,575+1025,150+14175+16300+18450+18600+1134 ISO 2015 All rights reservedB
48、S EN ISO 6848:2015ISO 6848:2015(E)9 Electrode shape and condition9.1 Electrode straightnessElectrode straightness shall not vary by more than 0,5 mm over a length of 100 mm.For shorter electrodes, the electrode straightness shall not vary by more than 0,13 mm over a length of 50 mm.9.2 Electrode fin
49、ishElectrodes shall be supplied with a ground finish. The ground finish designates that the electrode has been cleaned of impurities after it has been centreless ground to a uniform size. It shall be supplied with a bright, polished surface. The average surface roughness, measured longitudinally, shall not exceed 0,8 m Ra.9.3 Electrode qualityThe electrode surface shall be free of exces
