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1、BRITISH STANDARD BS EN 439:1994 Welding consumables Shielding gases for arc welding and cutting The European Standard EN 439:1994 has the status of a British Standard UDC 621.791.04-403:621.791.754 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c)
2、 BSI BS EN 439:1994 This British Standard, having been prepared under the direction of the Welding Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 December 1994 BSI 02-1999 The following BSI references relate to the work on this standa
3、rd: Committee reference WEE/39 Draft for comment 91/70924 DC ISBN 0 580 23240 9 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: AustriaO
4、esterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute
5、 of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Nor
6、malizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Un
7、controlled Copy, (c) BSI BS EN 439:1994 BSI 02-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 4393 National annex NA (informative) Committees responsibleInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:
8、00 2006, Uncontrolled Copy, (c) BSI BS EN 439:1994 ii BSI 02-1999 National foreword This British Standard has been prepared under the direction of the Welding Standards Policy Committee and is the English language version of EN 439:1994 Welding consumables Shielding gases for arc welding and cutting
9、, published by the European Committee for Standardization (CEN). National annex NA gives the constitution of the committees responsible for UK participation in the preparation of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of Britis
10、h Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 6, an inside back cove
11、r and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPE
12、AN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 439 August l994 UDC 621.791.04-403:621.791.754 Descriptors: Welding, arc welding, gas shielded gases, gas mixtures, classifications, designation, chemical properties English version Welding consumables Shielding gases for arc welding and cutting Produit
13、s consommables pour le soudage Gaz de protection pour le soudage et le coupage larc Schweizustze Schutzgase zum Lichtbogenschweien und Schneiden This European Standard was approved by CEN on 1994-08-17. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the con
14、ditions 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 application to the Central Secretariat or to any CEN member. This European Standard exists in thre
15、e 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Aus
16、tria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: r
17、ue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 439:1994 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 439:1994 BSI 02-1999 2 Foreword This European Standard was prepared by the Technical Committe
18、e CEN/TC 121, Welding, the secretariat of which is held by DS. 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 February 1995, and conflicting national standards shall be withdrawn at the latest by
19、 February 1995. According to the Common CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard. Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland
20、 and United Kingdom. Contents Page Foreword2 1Scope3 2Properties of gases3 3Classification of shielding gases3 4Designation3 5Tolerances of mixtures3 6Purities and dew point3 7Forms of supply3 7.1Gas cylinders4 7.2Liquid4 8Shielding gas identification4 Figure 1 Cylinder pressure-temperature diagram
21、for argon (II) at constant cylinder6 Table 1 Properties of gases4 Table 2 Classification of shielding gases for are welding and cutting5 Table 3 Identification numbers for gases in groups R and M containing helium6 Table 4 Purities and dew points of gases and gas mixtures6 Licensed Copy: sheffieldun
22、 sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 439:1994 BSI 02-19993 1 Scope This standard is applicable to gas shielded arc welding and cutting processes with gases and gas mixtures defined within. Applications include, but are not limited to: tungsten inert gas
23、 (TIG) welding; metal active gas (MAG) welding; metal inert gas (MIG) welding; plasma arc welding (PAW); plasma arc cutting (PAC); back shielding. The purpose of this standard is to classify shielding gases in accordance to their chemical properties as a base for the approval of shielding gas and fi
24、ller wire combinations. Gas purities and mixing tolerances are also specified. 2 Properties of gases The physical and chemical properties are listed in Table 1. 3 Classification of shielding gases Table 2 classifies into groups the various component/composition combinations of shielding gases accord
25、ing to their reaction behaviour. The symbols used for classification groups are: Where components not listed in Table 2 are added to one of these classifications it is designated as a special gas mixture and carries the prefix S. Details of the S designation are given in clause 4. 4 Designation Shie
26、lding gases are designated by the term “shielding gases”, the number of this standard, group and identification number according to Table 2. Example 1: A gas mixture containing 30 % helium, and balance argon is designated: Shielding gas EN 439 13 Example 2: A gas mixture containing 10 % carbon dioxi
27、de, 3 % oxygen and balance argon is designated: Shielding gas EN 439 M24 If argon is partly replaced by helium, the helium content is designated by an additional identification number, see Table 3. This identification number is added in brackets as a suffix. Example 3: A gas mixture M21 containing 2
28、5 % helium is designated: Shielding gas EN 439 M21 (1) Special gases shall be designated by the prefix S followed by the base gas or mixture symbol as in Table 2, followed by the percent concentration by volume and chemical formula of the additional gases. S (designation) + % chemical symbol Example
29、 4: A special gas mixture containing 10 % carbon dioxide, 3 % oxygen and balance argon, designation M24, but also containing 2,5 % neon is designated: Shielding gas EN 439 S M24 + 2,5Ne 5 Tolerances of mixtures For component concentrations up to 5 % by volume the permissible deviation shall not exce
30、ed 0,5 % by volume from the specified value. For component concentrations of between 5 % by volume and 50 % by volume the concentration shall not vary by more than 10 % of the specified value. 6 Purities and dew point The minimum purities and maximum dew points of gases as delivered in cylinders or
31、insulated tanks, are specified in Table 4 according to their classifications in Table 2. Purities and dew points for special gas mixtures shall correspond to the base gases or gas mixtures used, as specified in Table 4. For some materials, e.g. titanium and tantalum, gases of higher purities may be
32、required and specifications can be agreed between the user and the supplier. The users gas supply system should be designed and maintained such that the purity as delivered is maintained up to the point of use. 7 Forms of supply Shielding gases are supplied in the gaseous or liquid state either as s
33、ingle gas or gas mixture. Where gas mixtures are prepared on site from individual gases, the mixing system shall be designed and maintained such that the tolerance and the purity specified in clauses 5 and 6 can be achieved and maintained. R: reducing gas mixtures; I: inert gases and inert mixtures;
34、 M: oxidizing mixtures containing oxygen, carbon dioxide or both; C: highly oxidizing gas and highly oxidizing mixtures; F: unreactive gas or reducing gas mixtures. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 439:1994 4 BSI 02-1999 7.
35、1 Gas cylinders With the exception of carbon dioxide, all the gases and gas mixtures listed in Table 2 are fully in the gaseous state when supplied in gas cylinders. The gas cylinders for the gases listed in Table 2 are filled to a stated volume and pressure as indicated by the supplier. The actual
36、pressure will vary with the ambient temperature, e.g. the pressure of argon (I1) will vary as in Figure 1. Suitable regulators shall be fitted to the gas cylinder before use. 7.2 Liquid Liquefied gases will be supplied as low temperature (cryogenic) liquids in insulated tanks or, in the case of carb
37、on dioxide, as a liquid at ambient temperature in gas cylinders. Before use liquified gases supplies have to be converted into the gaseous state. In order to produce gas mixtures from liquified gases, the liquids have to be converted to the gaseous state prior to mixing. Argon-oxygen mixtures can al
38、so be stored pre-mixed as a liquid without using a mixer for the supply. NOTEIn plasma arc cutting, gas mixing can take place inside the machine from individual gases or gas mixtures. 8 Shielding gas identification The designation of the shielding gas according to clause 4 has to be provided with or
39、 without the term “shielding gases”. Table 1 Properties of gases Type of gasChemical symbol Specified at 0 C and 1,013 bar (0,101 MPa)Boiling point at 1,013 bar Reaction behaviour during welding Density (air = 1,293) Relative density to air kg/m3C ArgonAr1,7841,380 185,9Inert HeliumHe0,1780,138 268,
40、9Inert Carbon dioxideCO21,9771,529 78,5aOxidizing OxygenO21,4291,105 183,0Oxidizing NitrogenN21,2510,968 195,8Unreactiveb HydrogenH20,0900,070 252,8Reducing a Sublimation temperature (solid to gas transition temperature). b The behaviour of nitrogen varies with different materials. Possible negative
41、 influences shall be considered. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 439:1994 BSI 02-19995 Table 2 Classification of shielding gases for arc welding and cutting Symbola Components in percent volumeTypical applicationsRemarks G
42、roupIdentification No. OxidizingInertReducingUnreactive CO2O2ArHeH2N2 R1Balance2 ) 0 to 15TIG plasma arc welding, plasma arc cutting, back shielding 2Balance2 ) 15 to 35Reducing I1100MIG, TIG, plasma arc welding, back shielding 2100Inert 3Balance to 95 M11 0 to 5Balance2 ) 0 to 5Slightly oxidizing 2
43、 0 to 5Balance2 ) 3 0 to 3Balance2 ) 4 0 to 5 0 to 3Balance2 ) M21 5 to 25Balance2 ) MAG 2 3 to 10Balance2 ) 3 0 to 5 3 to 10Balance2 ) 4 5 to 25 0 to 8Balance2 ) M31 25 to 50Balance2 ) 2 10 to 15Balance2 ) 3 5 to 50 8 to 15Balance2 ) C1100More pronounced oxidation2Balance 0 to 30 F1100Plasma arc cu
44、tting, back shielding Unreactive 0 to 50 2BalanceReducing a Where components not listed are added to one of the groups in this table, the gas mixture is designated as special gas mixture and carries the prefix S. Details of the S designation are given in clause 4. 2) Argon may be replaced by up to 9
45、5 % helium. The helium content is designated by an additional identification number, see clause 4, and is given in Table 3. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 439:1994 6 BSI 02-1999 Table 3 Identification numbers for gases in
46、 groups R and M containing helium Table 4 Purities and dew points of gases and gas mixtures Identification numberHelium content in volume % (1) 0 to 33 (2) 33 to 66 (3) 66 to 95 Groupa PurityDew point at 1,013 bar Moisture % by vol min.C max.p.p.m. max. R99,95 5040 I99,99 5040 M199,70 5040 M299,70 4
47、480 M399,70 40120 C99,70 35200 F99,50 5040 Oxygen99,50 35200 Hydrogen99,50 5040 a Data for oxygen and hydrogen have been included in this table. Figure 1 Cylinder pressure-temperature diagram for argon (I1) at constant cylinder content Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:53
48、GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 439:1994 BSI 02-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Welding Standards Policy Committee (WEE/-) to Technical Committee WEE/39 upo
49、n which the following bodies were represented: Aluminium Federation Associated Offices Technical Committee Association of Welding Distributors British Association for Brazing and Soldering British Compressed Gases Association British Constructional Steelwork Association Ltd. British Steel Industry Electricity Association Engineering Equipment and Materials Users Association Lloyds Register of Shipping Magnesium Industry Council Power Generation Contractors Association PGC
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