Bsi bs en 26847 1994 (1999) iso 6847 1985

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[.]

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 has the status of a

British Standard

UDC 621.791.042.4:543.05

BS EN 26847:1994

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 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 0 580 22300 0

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:

Belgium Institut belge de normalisation

Finland Suomen Standardisoimisliito, r.y

France Association française 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

Portugal Instituto Portuguès da Qualidade Spain Asociación Española de Normalización y Certificación

Switzerland Association suisse de normalisation United Kingdom British Standards Institution

Amendments issued since publication

© BSI 11-1999 i

Contents

Page

National annex NA (informative) Committees responsible Inside back cover

BS EN 26847:1994

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 2 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

EUROPÄISCHE NORM February 1994

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)

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

EN 26847:1994

© BSI 11-1999

2

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 2 C48/1992 taken

by BTS 2 “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

1 Scope and field of application

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

NOTE It may possibly be extended to electrodes with diameters

greater than 6,3 mm.

2 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 1

Table 1

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

3 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

3.2 Welding position

The weld metal shall be deposited in the flat

position

3.3 Welding equipment

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

3.4 Electrode melting

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

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 4 is obtained.

Electrode diameter Plate size (min.)

1,6 – 2 – 2,5 – 3,2 – 4 – 5 55 × 55 × 10

EN 26847:1994

4 Weld pad size

The minimum dimensions of the weld pad, made up

of at least eight layers, are given in Table 2

Table 2

5 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 3

Table 3

6 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 5 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

Electrode diameter Weld pad minimum

dimensions

Electrode diameter Minimum millingdistance A from

the plate surface

Figure — Sampling method

© BSI 11-1999

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 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

BS EN

26847:1994

ISO 6847:1985

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