BS EN ISO 14175-2008 Welding consumables - Gases and gas mixtures for fusion welding and allied processes《焊接消耗品 氧炔焊及有关工艺用气体和混合气体》.pdf

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1、BRITISH STANDARDBS EN ISO 14175:2008Welding consumables Gases and gas mixtures for fusion welding and allied processesICS 25.160.20; 71.100.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g

2、60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 14175:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2008 BSI 2008ISBN 978 0 580 55179 6National forewordThis British Standard is the UK implementation of EN ISO 14175:2008. It

3、 supersedes BS EN 439:1994 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee WEE/39, Welding consumables.A list of organizations represented on this committee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 th

4、e necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 14175March 2008ICS

5、 25.160.20; 71.100.20 Supersedes EN 439:1994 English VersionWelding consumables - Gases and gas mixtures for fusionwelding and allied processes (ISO 14175:2008)Produits consommables pour le soudage - Gaz etmlanges gazeux pour le soudage par fusion et lestechniques connexes (ISO 14175:2008)Schweizust

6、ze - Gase und Mischgase fr dasLichtbogenschweien und verwandte Prozesse (ISO14175:2008)This European Standard was approved by CEN on 7 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of

7、 a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A versio

8、n in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark

9、, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUR

10、OPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 14175:2008: EForeword This document (EN ISO 14175:2008) has been prepared by Technical Committ

11、ee ISO/TC 44 “Welding and allied processes“ in collaboration with Technical Committee CEN/TC 121 “Welding” 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 the latest by

12、September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. 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 all suc

13、h patent rights. This document supersedes EN 439:1994. 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fran

14、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 14175:2008 has been approved by CEN as a EN ISO 14175

15、:2008 without any modification. ) EN ISO 14175:2008(E) BS EN ISO 14175:2008ISO 14175:2008(E) iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carr

16、ied 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, also take part in the work.

17、ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Internat

18、ional Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the e

19、lements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 14175 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 3, Welding consumables. This second edition cancels an

20、d replaces the first edition (ISO 14175:1997) which has been technically revised. 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 which can be found at w

21、ww.iso.org. BS EN ISO 14175:2008blank1Welding consumables Gases and gas mixtures for fusion welding and allied processes 1 Scope This International Standard specifies requirements for the classification of gases and gas mixtures used in fusion welding and allied processes including, but not limited

22、to: tungsten arc welding (Process 141); gas-shielded metal arc welding (Process 13); plasma arc welding (Process 15); plasma arc cutting (Process 83); laser welding (Process 52); laser cutting (Process 84); arc braze welding (Process 972). NOTE Process numbers are in accordance with ISO 4063. The pu

23、rpose of this International Standard is to classify and designate shielding, backing, process and assist gases in accordance with their chemical properties and metallurgical behaviour as the basis for correct selection by the user and to simplify the possible qualification procedures. Gas purities a

24、nd mixing tolerances are specified as delivered by the supplier (manufacturer) and not at the point of use. Gases or gas mixtures may be supplied in either liquid or gaseous form, but when used for welding and allied processes, the gases are always used in the gaseous form. Fuel gases, such as acety

25、lene, natural gas, propane, etc., and resonator gases, as used in gas lasers, are not covered by this International Standard. Transportation and handling of gases and containers shall be in accordance with local, national and regional standards and regulations as required. 2 Normative references The

26、 following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 31-0:1992, Quantities and units Part 0: General

27、principles ISO 14175:2008(E) BS EN ISO 14175:2008ISO 14175:2008(E) 2 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 base gas major or only component of a pure or mixed gas 3.2 classification number of this International Standard, followed by

28、 the symbol for the gas or gas mixture (main group and sub-group) 3.3 component gaseous substance that is essential to the performance of the gas mixture EXAMPLE In a mixture containing 11 % of CO2in argon, CO2is considered a component while argon is the base gas. 3.4 container vessel used for the s

29、hipment and/or storage of pure or mixed gases in a gaseous or liquid state 3.5 designation classification plus the symbols for all chemical components plus the nominal composition in volume percent NOTE Symbols for chemical components are given in 5.2. EXAMPLE A mixture of argon containing 11 % CO2i

30、s designated as ISO 14175-M20-ArC-11. 3.6 impurity gaseous substance with chemical composition different from the base gas, component or gas mixture 3.7 mixture gas consisting of two or more components 3.8 nominal value percentage value of a component, quoted by the manufacturer or supplier, which c

31、orresponds to the general composition given by the designation 3.9 symbol main-group and sub-group of a gas mixture NOTE Symbols are given in Table 2 (see also 5.1). EXAMPLE The symbol for a mixture of argon containing 11 % CO2is M20. BS EN ISO 14175:2008ISO 14175:2008(E) 34 Properties of gases 4.1

32、General Relevant physical and chemical properties of the gases considered in this International Standard are given in Table 1. Table 1 Properties of gas components Density a (air = 1,293) Relative density ato air Type of gas Chemical symbol kg/m3Boiling point at 0,101 MPa C Reactivity during welding

33、 Argon Ar 1,784 1,380 185,9 Inert Helium He 0,178 0,138 268,9 Inert Carbon dioxide CO21,977 1,529 78,5 bOxidizing Oxygen O21,429 1,105 183,0 Oxidizing Nitrogen N21,251 0,968 195,8 Low reactive c Hydrogen H20,090 0,070 252,8 Reducing aSpecified at 0 C and 0,101 MPa (1,013 bar). bSublimation temperatu

34、re (solid to gas transition temperature). cThe behaviour of nitrogen varies with different materials and applications. Possible influences must be considered by the user. 4.2 Rounding-off procedure For purposes of determining compliance with the requirements of this International Standard, the actua

35、l test values obtained shall be subjected to the rounding-off rules of ISO 31-0:1992, Annex B, Rule A. If the measured values are obtained by equipment calibrated in units other than those of this International Standard, the measured values shall be converted to the units of this International Stand

36、ard before rounding off. If an average value is to be compared to the requirements of this International Standard, rounding off shall be done only after calculating the average. In the case where the testing standard cited in the normative references of this International Standard contains instructi

37、ons for rounding off that conflict with the instructions of this International Standard, the rounding-off requirements of the testing standard shall apply. The rounded-off results shall fulfill the requirements of the appropriate table for the classification under test. 5 Classification and designat

38、ion 5.1 Classification 5.1.1 General Gases and gas mixtures shall be classified by the number of this International Standard, followed by the symbol for the gas in accordance with Table 2. NOTE The classification is based on the reactivity of the gas or gas mixture. BS EN ISO 14175:2008ISO 14175:200

39、8(E) 4 5.1.2 Main group The letter codes and numbers used for the main groups are: I: inert gases and inert gas mixtures; M1, M2 and M3: oxidising mixtures containing oxygen and/or carbon dioxide; C: highly oxidising gas and highly oxidising mixtures; R: reducing gas mixtures; N: low reactive gas or

40、 reducing gas mixtures, containing nitrogen; O: oxygen; Z: gas mixtures containing components not listed or mixtures outside the composition ranges listed in Table 2. 5.1.3 Sub-group The main groups, except Z, are divided into sub-groups based on the presence and level of different components having

41、 an influence on the reactivity (see Table 2). The values indicated in Table 2 are nominal values. 5.1.4 Classification examples EXAMPLE 1 For a gas mixture containing 6 % carbon dioxide, 4 % oxygen in argon: Classification: ISO 14175 M25 EXAMPLE 2 For a gas mixture containing 30 % helium in argon:

42、Classification: ISO 14175 I3 EXAMPLE 3 For a gas mixture containing 5 % hydrogen in argon: Classification: ISO 14175 R1 EXAMPLE 4 For a gas mixture containing 0,05 % of oxygen in argon: Classification: ISO 14175 Z 5.2 Designation 5.2.1 General Gases and gas mixtures are designated by the classificat

43、ion (see 5.1) and the symbols of their chemical components as below, followed by the corresponding nominal composition in volume percent: Ar: argon C: carbon dioxide H: hydrogen N: nitrogen BS EN ISO 14175:2008ISO 14175:2008(E) 5 O: oxygen He: helium The base gas symbol shall be followed by the symb

44、ols for the other components in decreasing order of percent, followed by the nominal composition values, in volume percent, which are separated by a dash. 5.2.2 Designation examples EXAMPLE 1 For a gas mixture containing 6 % carbon dioxide, 4 % oxygen in argon: Classification: ISO 14175 M25 Designat

45、ion: ISO 14175 M25 ArCO 6/4 EXAMPLE 2 For a gas mixture containing 30 % helium in argon: Classification: ISO 14175 I3 Designation: ISO 14175 I3 ArHe 30 EXAMPLE 3 For a gas mixture containing 5 % hydrogen in argon: Classification: ISO 14175 R1 Designation: ISO 14175 R1 ArH 5 EXAMPLE 4 For a gas mixtu

46、re containing 7,5 % argon, 2,5 % carbon dioxide in helium: Classification: ISO 14175 M12 Designation: ISO 14175 M12 HeArC 7,5/2,5 For gas mixtures containing components listed, but outside the ranges in Table 2, the letter Z prefixes the symbol for the base gas and symbols for components as above, f

47、ollowed by the nominal composition values, in volume percent, which are separated by a dash. EXAMPLE 5 For a gas mixture containing 0,05 % of oxygen in argon: Classification: ISO 14175 Z Designation: ISO 14175 Z ArO 0,05 For gas mixtures containing components not listed in Table 2, the letter Z pref

48、ixes the symbol for the base gas and symbols for components as above, but with a plus sign preceding the unlisted component, followed by the nominal composition values, in volume percent, which are separated by a dash. EXAMPLE 6 For a gas mixture containing 0,05 % of xenon, chemical symbol Xe, in ar

49、gon: Classification: ISO 14175 Z Designation: ISO 14175 Z Ar+Xe 0,05 BS EN ISO 14175:2008ISO 14175:2008(E) 6 Table 2 Classification of process gases for fusion welding and allied processes Symbol Components in nominal percentage of volume Oxidizing Inert Reducing Low reactivity Main group Sub-group CO2O2Ar He H2N2I 1 100 2 100 3 balance 0,5 u He u 95 M1 1 0,5 u CO2u 5 balance a0,5 u H2u 5 2 0,5 u CO2u 5 balance a3 0,5 u O2u 3 balance a4 0,5 u CO2u 5 0,5