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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 756 : 1996 The Euro
2、pean Standard EN 756 : 1995 has the status of a British Standard ICS 25.160.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Welding consumables Wire electrodes and wire-flux combinations for submerged arc welding of non alloy and fine grain steels Classification Licensed Co
3、py: sheffieldun sheffieldun, na, Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 August 1996 BSI 1996 T
4、he following BSI references relate to the work on this standard: Committee reference WEE/39 Draft for comment 92/76973 DC ISBN 0 580 25760 6 BS EN 756 : 1996 Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British
5、 Standard was entrusted to Technical Committee WEE/39, Welding consumables, upon 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 Associa
6、tion British Constructional Steelwork Association Ltd. British Iron and Steel Producers Association Electricity Association Engineering Equipment and Materials Users Association Lloyds Register of Shipping Magnesium Industry Council Power Generation Contractors Association (PGCA (BEAMA Ltd.) Process
7、 Plant Association Stainless Steel Wire Industry Association Welding Institute Welding Manufacturers Association (BEAMA Ltd.) Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 756 : 1996 BSI 1996i Contents Page Committees responsibleInsi
8、de front cover National forewordii EN foreword2 Text of EN 7563 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 1996 BS EN 756 : 1996 National foreword This British Standard has been prepared by Technical Committee WEE/39 and is the E
9、nglish language version of EN 756 : 1995 Welding consumables Wire electrodes and wire-flux combinations for submerged arc welding of non alloy and fine grain steels Classification published by the European Committee for Standardization (CEN). EN 756 was produced as a result of international discussi
10、ons in which the United Kingdom took an active part. BS EN 756 : 1996 partially supersedes BS 4165 : 1984 which will be withdrawn upon publication of BS EN 760. Compliance with a British Standard does not of itself confer immunity from legal obligations. Licensed Copy: sheffieldun sheffieldun, na, T
11、ue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by
12、any means reserved in all countries to CEN and its members Ref. No. EN 756 : 1995 E EUROPEAN STANDARDEN 756 NORME EUROPE ENNE EUROPA ISCHE NORM October 1995 ICS 25.160.20 Descriptors: Arc welding, welding fluxes, welding electrodes, scale: corrosion, alloy steels, unalloyed steels, manganese steels,
13、 classifications, symbols, mechanical tests, chemical composition English version Welding consumables Wire electrodes and wire-flux combinations for submerged arc welding of non alloy and fine grain steels Classification Produits consommables pour le soudage Fils-e lectrodes et couples fils-flux pou
14、r le soudage a larc sous flux des aciers non allie s et a grains fins Classification Schweizusa tze Drahtelektroden und Draht-Pulver-Kombinationen zum Unterpulverschweien von unlegierten Sta hlen und Feinkornsta hlen Einteilung This European Standard was approved by CEN on 1995-08-27. CEN members ar
15、e 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 application to
16、the Central Secretariat 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 Central Secretariat has the same st
17、atus as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na,
18、Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 756: 1995 BSI 1996 Foreword This European Standard was prepared by the Technical Committee CEN/TC 121, Welding, of which the secretariat is held by DS. This European Standard shall be given the status of a national standard, ei
19、ther by publication of an identical text or by endorsement, at the latest by April 1996, and conflicting national standards shall be withdrawn at the latest by April 1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austri
20、a, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword2 0Introduction3 1Scope3 2Normative references3 3Classification3 4Symbols and requirements3 4.1Symbol for the p
21、roduct/process3 4.2Symbol for tensile properties3 4.3Symbol for impact properties of all-weld metal or two-run welded joint4 4.4Symbol for type of welding flux4 4.5Symbol for the chemical composition of wire electrodes4 5Mechanical tests5 5.1Multi-run technique5 5.2Two-run technique6 6Chemical analy
22、sis6 7Technical delivery conditions6 8Designation6 Annex A(informative) Bibliography7 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 756: 1995 BSI 1996 0 Introduction This standard proposes a classification in order to designate w
23、ire electrodes by chemical analyses and wire-flux combinations in terms of the yield strength, tensile strength and elongation of the all-weld metal. The ratio of yield to tensile strength of weld metal is generally higher than that of parent material. Users should note that matching weld metal yiel
24、d strength to parent material yield strength will not necessarily ensure that the weld metal tensile strength matches that of the parent material. Where the application requires matching tensile strength, therefore, selection of the consumable should be made by reference to column 3 of table 1. Alth
25、ough combinations of wires and fluxes supplied by individual companies may have the same grading, the individual wires and fluxes from different companies are not interchangeable unless verified according to this standard. It should be noted that the mechanical properties of all-weld metal test spec
26、imens used to classify the wire-flux combinations will vary from those obtained in production joints because of differences in welding procedures such as electrode size and parent material composition. 1 Scope This standard specifies requirements for classification of wire-flux combinations and all-
27、weld metal in the as-welded condition for submerged arc welding of non-alloy and fine grain steels with a minimum yield strength of up to 500 N/mm2. One flux may be classified with different wire electrodes. The wire electrode is also classified separately based on its chemical composition. Fluxes f
28、or the single-run and two-run techniques are classified on the basis of the two-run technique. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and
29、the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. prE
30、N 759Welding consumables Technical delivery conditions for welding filler metals Type of product, dimensions, tolerances and marking prEN 760Welding consumables Fluxes for submerged arc welding Classification prEN1258Welding Measurement of preheating temperature, interpass temperature and preheat ma
31、intenance temperature during welding prEN 1597-1Welding consumables Testing for classification Part 1 : Test assembly for all-weld metal test specimens in steel, nickel and nickel alloys prEN 1597-2Welding consumables Testing for classification Part 2 : Preparation of test assembly for single and tw
32、o run technique test specimens in steel ISO 31-0 : 1992 Quantities and units Part 0 : General principles 3 Classification The classification includes all-weld metal properties obtained with a manufacturers specific wire-flux combination as given below. A wire electrode may be separately classified w
33、ith the symbol for its chemical composition in table 5. The classification is divided into five parts: 1) the first part gives a symbol indicating the product/process to be identified; 2) the second part gives a symbol indicating the strength and elongation of all-weld metal for multi-run technique
34、or the strength of the parent material used in classification for the two-run technique; 3) the third part gives a symbol indicating the impact properties of all-weld metal or welded joint; 4) the fourth part gives a symbol indicating the type of flux used; 5) the fifth part gives a symbol indicatin
35、g the chemical composition of the wire electrode used. 4 Symbols and requirements 4.1 Symbol for the product/process The symbol for a wire electrode and/or a wire-flux combination used in the submerged arc welding process shall be the letter S. 4.2 Symbol for tensile properties 4.2.1 Multi-run techn
36、ique The symbol in table 1 indicates yield strength, tensile strength and elongation of the all-weld metal in the as-welded condition determined in accordance with 5.1. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 756: 1995 BSI
37、1996 Table 1. Symbol for tensile properties by multi-run technique SymbolMinimum yield strength1) Tensile strength Minimum elongation2) N/mm2N/mm2% 35355440 to 57022 38380470 to 60020 42420500 to 64020 46460530 to 68020 50500560 to 72018 1) For yield strength the lower yield (ReL) shall be used when
38、 yielding occurs, otherwise the 0,2 % proof strength (Rp0,2) shall be used. 2) Gauge length is equal to five times the specimen diameter. 4.2.2 Two-run technique The symbol indicates strength of the welded joint in relation to strength of the parent material used in two-run welding tests satisfactor
39、ily completed in accordance with 5.2. Table 2. Symbol for tensile properties by two-run technique SymbolMinimum parent material yield strength Minimum tensile strength of the welded joint N/mm2N/mm2 2T275370 3T355470 4T420520 5T500600 4.3 Symbol for impact properties of all-weld metal or two-run wel
40、ded joint The symbol in table 3 indicates the temperature at which an average impact energy of 47 J is achieved under the conditions given in clause 5. Three specimens shall be tested. Only one individual value may be lower than 47 J but not lower than 32 J. When a wire-flux combination has been cla
41、ssified for a certain temperature, it automatically covers any higher temperature in table 3. Table 3. Symbol for impact properties of all-weld metal or two-run welded joint SymbolTemperature for minimum average impact energy of 47 J C ZNo requirements A+20 00 2220 3230 4240 5250 6260 7270 8280 4.4
42、Symbol for type of welding flux The symbol in table 4 indicates type of welding flux as described in EN 760. Table 4. Symbol for type of welding flux Type of fluxSymbol Manganese-silicateMS Calcium-silicateCS Zirconium-silicateZS Rutile-silicateRS Aluminate-rutileAR Aluminate-basicAB Aluminate-silic
43、ateAS Aluminate-fluoride basicAF Fluoride-basicFB Any other typeZ 4.5 Symbol for the chemical composition of wire electrodes The symbol in table 5 indicates the chemical composition of the wire electrode and includes an indication of characteristic alloying elements. The chemical composition of the
44、weld metal is dependent on the chemical composition of the wire electrode and the metallurgical behaviour of the flux (see EN 760). Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 05:34:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 756: 1995 BSI 1996 Table 5. Chemical composition of
45、 wire electrodes for submerged arc welding, percentage by mass SymbolChemical composition(%) (m/m)1)2)3) CSiMnPSMoNiCr S0Any other agreed composition S10,05 to 0,150,150,35 to 0,600,0250,0250,150,150,15 S20,07 to 0,150,150,80 to 1,300,0250,0250,150,150,15 S30,07 to 0,150,151,30 to 1,75 0,0250,0250,1
46、50,150,15 S40,07 to 0,150,151,75 to 2,25 0,0250,0250,150,150,15 S1Si0,07 to 0,150,15 to 0,400,35 to 0,600,0250,0250,150,150,15 S2Si0,07 to 0,150,15 to 0,400,80 to 1,300,0250,0250,150,150,15 S2Si20,07 to 0,150,40 to 0,600,80 to 1,300,0250,0250,150,150,15 S3Si0,07 to 0,150,15 to 0,401,30 to 1,85 0,025
47、0,0250,150,150,15 S4Si0,07 to 0,150,15 to 0,401,85 to 2,25 0,0250,0250,150,150,15 S1Mo0,05 to 0,150,05 to 0,250,35 to 0,600,0250,0250,45 to 0,650,150,15 S2Mo0,07 to 0,150,05 to 0,250,80 to 1,300,0250,0250,45 to 0,650,150,15 S3Mo0,07 to 0,150,05 to 0,251,30 to 1,75 0,0250,0250,45 to 0,650,150,15 S4Mo
48、0,07 to 0,150,05 to 0,251,75 to 2,25 0,0250,0250,45 to 0,650,150,15 S2Ni10,07 to 0,150,05 to 0,250,80 to 1,300,0200,0200,150,80 to 1,200,15 S2Ni1,50,07 to 0,150,05 to 0,250,80 to 1,300,0200,0200,151,20 to 1,80 0,15 S2Ni20,07 to 0,150,05 to 0,250,80 to 1,300,0200,0200,151,80 to 2,40 0,15 S2Ni30,07 to
49、 0,150,05 to 0,250,80 to 1,300,0200,0200,152,80 to 3,70 0,15 S2Ni1Mo0,07 to 0,150,05 to 0,250,80 to 1,300,0200,0200,45 to 0,650,80 to 1,200,20 S3Ni1,50,07 to 0,150,05 to 0,251,30 to 1,70 0,0200,0200,151,20 to 1,80 0,20 S3Ni1Mo0,07 to 0,150,05 to 0,251,30 to 1,80 0,0200,0200,45 to 0,650,80 to 1,200,20 S3Ni1,5Mo0,07 to 0,150,05 to 0,251,20 to 1,800,0200,0200,30 to 0,501,20 to 1,800,20 1) Finished product chemical composition, Cu inclusive of copper coating # 0,30 %, Al # 0,030 %. 2) Single values shown in the table ar