www bzfxw com BRITISH STANDARD BS EN 26847 1994 ISO 6847 1985 Covered electrodes for manual metal arc welding — Deposition of a weld metal pad for chemical analysis The European Standard EN 6847 1994[.]
Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BRITISH STANDARD Covered electrodes for manual metal arc welding — Deposition of a weld metal pad for chemical analysis The European Standard EN 6847:1994 has the status of a British Standard UDC 621.791.042.4:543.05 BS EN 26847:1994 ISO 6847:1985 BS EN 26847:1994 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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: 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 May 1994 © BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference WEE/39 Draft announced in BSI News, May 1993 ISBN 580 22300 Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y France Association franỗaise de normalisation Germany Deutsches Institut für Normung e.V Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugs da Qualidade Spain Asociación Espola de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd No Date Comments BS EN 26847:1994 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Contents Cooperating organizations National foreword Foreword Scope and field of application Backing plate Conditions of deposition Weld pad size Sampling Analysis of weld pad National annex NA (informative) Committees responsible Figure — Sampling method Table Table Table © BSI 11-1999 Page Inside front cover ii 3 4 Inside back cover 4 i BS EN 26847:1994 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 26847:1994 Covered electrodes for manual metal arc welding — Deposition of a weld metal pad for chemical analysis, published by the European Committee for Standardization (CEN) which endorses ISO 6847:1985 Covered electrodes for manual metal arc welding — Deposition of a weld metal pad for chemical analysis published by the International Organization for Standardization (ISO) EN 26847:1994 was produced as a result of international discussion in which the UK took an active part A British Standard does not purport to include all the necessary provisions of a contract Users of British 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 to 4, an inside back cover 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 ii © BSI 11-1999 EUROPEAN STANDARD EN 26847 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI NORME EUROPÉENNE February 1994 EUROPÄISCHE NORM UDC 621.791.042.4:543.05 Descriptors: Welding, electric welding, arc welding, covered electrodes, weld metal, chemical analysis English version Covered electrodes for manual metal arc welding — Deposition of a weld metal pad for chemical analysis (ISO 6847:1985) Electrodes enrobées pour soudage manuel l’arc — Exécution d’un dépot de métal fondu en vue de l’analyse chimique (ISO 6847:1985) Umhüllte Stabelektroden für das Lichtbogenhandschweißen — Auftragung von Schweißgut zur Bestimmung der chemischen Zusammemsetzung (ISO 6847:1985) ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ This European Standard was approved by CEN on 1994-02-04 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 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 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 status 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 CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1994 Copyright reserved to CEN members Ref No EN 26847:1994 E Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 26847:1994 Foreword This European Standard based on the International Standard Covered electrodes for manual metal arc welding — Deposition of a weld metal pad for chemical analysis (ISO 6847:1985) has been submitted to the Unique Acceptance Procedure in accordance with resolution BTS C48/1992 taken by BTS “Engineering” The result of the Unique Acceptance Procedure was positive 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 August 1994, and conflicting national standards shall be withdrawn at the latest by August 1994 In accordance with the 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 and United Kingdom ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 11-1999 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 26847:1994 Scope and field of application 3.3 Welding equipment This International Standard defines the procedure to be used for depositing weld metal by fusing covered metal electrodes with diameters ranging from 1,6 to 6,3 mm, and specifies the procedure for the chemical analysis of the weld pad thus obtained, whatever the nature of the deposited metal This analysis may be carried out either on chips taken by milling or using spectrographic methods The method of deposition specified in this International Standard shall be referred to in case of dispute The welding equipment shall have characteristics in conformity with the instructions for use of the electrodes The open-circuit voltage of a.c welding equipment shall not be less than that specified by the manufacturer when the electrodes are used on a.c NOTE It may possibly be extended to electrodes with diameters greater than 6,3 mm Backing plate 2.1 Nature The backing plate shall be made from steel having a composition similar to that of the deposited metal or from a weldable carbon-manganese structural steel with a carbon content of less than 0,20 % (m/m) 2.2 Dimensions The minimum dimensions of the backing plate are given in Table Table If the electrodes have to be dried, baking shall be carried out in accordance with the method specified by the manufacturer The electrode shall be entirely melted except for the usual stub of 40 to 50 mm, including the bare section The arc length shall always be maintained as short as possible inasmuch as it remains stable without visible extinguishing The width of each bead shall range from 1,5 to 2,5 times the diameter of the electrode core It shall be obtained without weaving, at normal welding speed The current intensity shall be equal to the mean value recommended for welding in the flat position or, if not specified, it shall correspond to 70 % of the maximum current value indicated by the manufacturer ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Electrode diameter Plate size (min.) mm mm 1,6 – – 2,5 – 3,2 – – 55 × 55 × 10 6,3 3.4 Electrode melting 65 × 65 × 10 2.3 Surface condition The surface of the backing plate onto which the weld metal is to be deposited shall be previously cleaned by grinding in order to remove any remaining rust, scale, grease or paint Conditions of deposition 3.1 Type of current and polarity The weld metal shall be deposited using the type of current (and, if appropriate, the polarity) indicated by the manufacturer for the electrodes concerned If the manufacturer leaves the choice between alternating current (a.c.) and direct current (d.c.), alternating current shall be chosen 3.5 Deposition of weld metal After each pass, the deposited metal shall be cooled by immersion in 10 l of water for about 30 s, the depth of immersion being at least 10 cm The slag shall be removed after the execution of each pass The following layer shall be deposited after drying After each cooling operation, the test piece shall be placed in front of the welder in the opposite direction so as to make the end of deposition of the previous layer coincide with the beginning of deposition of the following layer The metal shall be deposited in successive layers by juxtaposing rectilinear layers, the width and length of which are defined in this International Standard The building-up shall continue until the weld pad size indicated in clause is obtained 3.2 Welding position The weld metal shall be deposited in the flat position © BSI 11-1999 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 26847:1994 Weld pad size Table The minimum dimensions of the weld pad, made up of at least eight layers, are given in Table Table Electrode diameter Weld pad minimum dimensions mm mm 1,6 – and 2,5 30 × 30 × 13 3,2 – and 40 × 40 × 16 6,3 55 × 55 × 20 Sampling The surface oxide film shall be removed by grinding or milling the sampling zone The minimum milling distance (dimension A in the Figure or at least four layers) from the plate surface, as a function of the diameter of the electrode core, shall be in accordance with the values indicated in Table Minimum milling distance A from the plate surface Electrode diameter mm 1,6 – and 2,5 mm 3,2 – and 10 6,3 12 Analysis of weld pad 6.1 The chip sampling for the analysis shall be carried out by dry milling slantwise in relation to the plate surface, so as to obtain, in a minimum time, a sampling of all the upper layers of the weld pad over their whole length 6.2 If spectral methods are used for analyses, the plane obtained by machining the weld pad shall be used, in accordance with the specifications laid down in clause At least three impacts shall be performed, distributed on a diagonal of the inclined plane The results shall correspond to the averaged value of the three impact readings ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Figure — Sampling method © BSI 11-1999 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 26847:1994 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 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 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 (BEAMA Ltd.) Process Plant Association Stainless Steel Wire Industry Association Welding Institute Welding Manufacturers’ Association (BEAMA Ltd.) Coopted member ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 11-1999 Licensed Copy: Blind Login, Messier Dowty France, Wed Dec 06 05:44:43 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 26847:1994 ISO 6847:1985 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001 In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: 020 8996 7111 Fax: 020 8996 7048 Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained BSI 389 Chiswick High Road London W4 4AL If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070