bs 288 - 2

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BRITISH STANDARD BS EN288-2 : 1992

IncorporatingAmendment A1, notissued separately

The European Standard EN 288-2 : 1992, with the incorporation of itsamendment A1, has the status of a British Standard

ICS 25.160.10

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

Specification and approval ofwelding procedures formetallic materials

Part 2. Welding procedure specificationfor arc welding

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BS EN 288-2 : 1992/A1 : 1997 Issue 2, November 1997

This British Standard, havingbeen prepared under thedirection of the EngineeringSector Board, was publishedunder the authority of theStandards Board and comes intoeffect on1 May 1992

BSI 1997

The following BSI referencesrelate to the work on thisstandard:Committee reference WEE/36Draft for comment 89/70002 DC

ISBN 0 580 28115 9

Amendments issued since publication

Amd. No. Date Text affected

9735 November1997

Indicated in the margin by a sideline

Committees responsible for thisBritish Standard

The preparation of this British Standard was entrusted to Technical CommitteeWEE/36, Approval testing of welding procedures and welders, upon which thefollowing bodies were represented:

AEA Technology

Association of Consulting Scientists

British Constructional Steelwork Association Ltd.

British Iron and Steel Producers' Association

British Nuclear Fuels plc

British Railways Board

British Stainless Steel Association

Castings Technology International

Electricity Association

General Municipal Boilermaker and Allied Trades Union

Health and Safety Executive

Heating and Ventilating Contractors' Association

Lloyd's Register of Shipping

Ministry of Defence

Power Generation Contractors' Association (PGCA (BEAMA Ltd.))

Process Plant Association

Railway Industry Association

Safety Assessment Federation Ltd.

Welding Institute

Welding Manufacturers' Association (BEAMA Ltd.)

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BSI 1997 i

Issue 2, November 1997 BS EN 288-2 : 1992/A1 : 1997

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National foreword

This Part of BS EN 288 has been prepared by Technical Committee WEE/36, and is theEnglish language version of EN 288-2 : 1992 Specification and approval of weldingprocedures for metallic materials Part 2: Welding procedure specification for the arcwelding, incorporating amendment A1, published by the European Committee forStandardization (CEN).

EN 288-2 and amendment A1 were produced as a result of international discussions inwhich the UK took an active part.

Cross-references

The British Standards which implement international or European publicationsreferred to in this document may be found in the BSI Standards Catalogue under thesection entitled `International Standards Correspondence Index', or using the `Find'facility of the BSI Standards Electronic Catalogue.

Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the ENtitle page, pages 2 to 6, an inside back cover and a back cover.

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CENEuropean Committee for Standardization

ComiteÂ EuropeÂen de Normalisation

EuropaÈisches Komitee fuÈ r Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

1997 Copyright reserved to CEN membersRef. No. EN 288-2 : 1992 + A1 : 1997 E

EUROPEAN STANDARD EN 288-2

NORME EUROPEÂ ENNE February 1992

EUROPAÈ ISCHE NORM + A1June 1997

UDC 621.791.76(032.1)669

Descriptors: Welding, arc welding, metals, procedure, approval, definitions, specification

English version

Specification and approval of welding procedures for metallicmaterials Ð Part 2: Welding procedure specification for arc welding

(includes amendment A1: 1997)

Descriptif et qualification d'un mode opeÂratoire desoudage sur les mateÂriaux meÂtalliques ÐPartie 2: Descriptif d'un mode opeÂratoire desoudage pour la soudage aÁ l'arc(inclut l'amendment A1 : 1997)

Anforderung und Anerkennung vonSchweiûverfahren fuÈr metallische Werkstoffe ÐTeil 2: Schweiûanweisung fuÈr dasLichtbogenschweiûen(enthaÈlt AÈ nderung A1 : 1997)

This European Standard was approved by CEN on 1992-02-21. Amendment A1 wasapproved on 1996-12-11. CEN members are bound to comply with theCEN/CENELEC Internal Regulations which stipulate the conditions for giving thisEuropean Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standardsmay 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 aCEN member into its own language and notified to the Central Secretariat has thesame 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.

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Issue 2, November 1997EN 288-2 : 1992/A1 : 1997

BSI 1997

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Foreword

This standard has been prepared by Working Group 1,Specification and approval of welding procedures formetallic materials of CEN/TC 121, Welding.

For this standard, ISO/TC 44/SC10 N 176 wasconsidered and used as a basis. However, alterationswere necessary due to the consideration of experienceand updated knowledge.

In accordance with the Common CEN/CENELECRules, the following countries are bound to implementthis European Standard: Austria, Belgium, Denmark,Finland, France, Germany, Greece, Iceland, Ireland,Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and United Kingdom.

Foreword of Amendment A1

This Amendment EN 288-2 : 1992/A1 : 1997 toEN 288-2 : 1992 has been prepared by TechnicalCommittee CEN/TC 121, Welding, the secretariat ofwhich is held by DS.

This Amendment to the European Standard EN 288-2 :1992 shall be given the status of a national standard,either by publication of an identical text or byendorsement, at the latest by December 1997, andconflicting national standards shall be withdrawn atthe latest by December 1997.

According to the CEN/CENELEC Internal Regulations,the national standards organizations of the followingcountries are bound to implement this EuropeanStandard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland,Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and the United Kingdom.

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Contents

Page

Foreword 2

Foreword of amendment A1 2

1 Scope 3

2 Normative references 3

3 Definitions 3

4 Technical contents of weldingprocedure specification (WPS) 3

4.1 General 3

4.2 Related to the manufacturer 3

4.3 Related to the parent metal 3

4.4 Common to all welding procedures 3

4.5 Specific to a group of weldingprocesses 4

Annex A (informative) Manufacturer'swelding procedure specification (WPS) 5

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1 ScopeThis standard specifies requirements for the content ofwelding procedure specifications for arc weldingprocesses. The principles of this standard may be alsoapplied to other fusion welding processes subject toagreement between the contracting parties.

Variables listed in this standard are those influencingthe metallurgy, mechanical properties and the geometryof the assembly.

2 Normative referencesThis standard incorporates by dated or undatedreference, provisions from other publications. Thesenormative references are cited at the appropriateplaces in the text and the publications are listedhereafter. For dated references, subsequentamendments to or revisions of any of thesepublications apply to this standard only whenincorporated in it by amendment or revision. Forundated references the latest edition of the publicationreferred to applies.

EN 288-1 Specification and approval ofwelding procedures for metallicmaterials Ð Part 1: General rulesfor fusion welding

EN 439 Welding consumables Ð Shieldinggases for arc welding and cutting

EN 24063 Welding, brazing, soldering andbraze welding of metals ÐNomenclature of processes andreference numbers for symbolicrepresentation on drawings(ISO 4063 : 1990)

EN 26848 Tungsten electrodes for inert gasshielded arc welding and forplasma cutting and welding ÐCodification (ISO 6848 : 1984)

EN ISO 6947 Welds Ð Working positions ÐDefinitions of angles of slope androtation (ISO 6947: 1990)

3 DefinitionsFor the purpose of this standard, the definitions givenin EN 288-1 apply.

4 Technical contents of weldingprocedure specification (WPS)

4.1 General

The welding procedure specification (WPS) shall givedetails of how a welding operation is to be performedand shall contain all relevant information about thewelding work.

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Welding procedure specifications may cover a certainrange of thickness of the joined parts and may alsocover a range of parent metals and even filler metals.Some manufacturers may prefer additionally to preparework instructions for each specific job as part ofdetailed production planning.

Information listed in 4.2 to 4.5 is adequate for mostwelding procedures. For some applications it may benecessary to supplement or reduce the list. Therelevant information shall be specified in the WPS.

Ranges and tolerances, according to the manufacturer'sexperience, shall be specified where appropriate.

An example of the WPS format is shown in annex A.

4.2 Related to the manufacturer

4.2.1 Identification of the manufacturer

4.2.2 Identification of the WPS

4.2.3 Reference to the Welding ProcedureApproval Record (WPAR) or other documents asrequired

4.3 Related to the parent metal

4.3.1 Parent metal type

± Identification of material, preferably by referenceto an appropriate standard.

A WPS may cover a group of materials.

4.3.2 Material dimensions

± The thickness ranges of the joint.

± Outside diameter ranges for pipes.

4.4 Common to all welding procedures

4.4.1 Welding process

± Welding process(es) used shall be designated inaccordance with EN 24063.

4.4.2 Joint design

± Sketch of the joint design showing configurationand dimensions.

Details may be given by reference to an appropriatestandard on joint design.

± Weld run sequence shall be given on the sketch ifessential for the properties of the weld.

4.4.3 Welding position

± Applicable welding positions shall be specified inaccordance with EN ISO 6947.

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Issue 2, November 1997EN 288-2 : 1992/A1 : 1997

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4.4.4 Groove or edge preparation

± Groove cleaning, degreasing, jigging and tackwelding.

± The methods to be used.

4.4.5 Welding technique

± No weaving

± Weaving:

a) For manual welding max. width of the run.

b) For mechanized welding max. weaving oramplitude, frequency and dwell time of oscillation.

± Torch, electrode and/or wire angle.

4.4.6 Back gouging

± The method to be used.

4.4.7 Backing

± The method and type of backing, material anddimensions.

± For gas backing apply 4.5.3 to 4.5.5.

4.4.8 Welding consumable, designation

± Designation, manufacturer and trade name.

4.4.9 Welding consumable, dimensions

± Diameter of electrode/wire or width and thicknessof strip electrode.

4.4.10 Filler metal and flux, handling

± If a filler metal or flux is to be dried or treatedbefore use, this shall be specified. Reference to anappropriate standard is permitted.

4.4.11 Electrical parameters

± Type of current (AC or DC) and polarity.

± Pulse welding: Pulse time, pulse current, pulsefrequency, background current and backgroundvoltage to be specified.

± Current range.

± Arc voltage range.

4.4.12 Mechanized welding

± Travel speed range.

± Wire feed speed range.

NOTE. Applied to 4.4.11 and 4.4.12. If the equipment does notpermit control of one of those variables, the machine settingsshall be specified instead. The range of application for the WPSshall then be limited to equipment of that particular type.

4.4.13 Preheat temperature

± The nominal temperature applied at the start ofthe welding process.

± If pre-heating is not required the lowest workpiece temperature immediately prior to welding.

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4.4.14 Interpass temperature

± Maximum interpass temperature.

4.4.15 Post-weld heat-treatment

± For any post-weld heat-treatment, or ageing, theprocedure or reference to be made to a separatepost-weld heat-treatment or ageing specification.

4.4.16 Shielding gas

Designation in accordance with EN 439, manufacturerand trade name.

4.5 Specific to a group of welding processes

4.5.1 Process group 11 (metal-arc weldingwithout gas protection)

± For process 111 the run-out length of electrodeconsumed.

4.5.2 Process group 12 (submerged arc welding)

± For multiple electrode systems the number andconfiguration of wire electrodes and electricalconnnections.

± Distance contact tube/work piece: the distancefrom contact tip nozzle to the surface of theworkpiece for mechanized welding.

± Flux: designation, manufacturer and trade name.

± Additional filler metal.

4.5.3 Process group 13 (gas-shielded metal arcwelding)

± Gas flow rate and nozzle diameter.

± Number of wire electrodes.

± Additional filler metal.

± Distance contact tube/work piece: the distancefrom contact tip nozzle to the surface of theworkpiece for mechanized welding.

4.5.4 Process group 14 (gas-shielded weldingwith non-consumable electrode)

± For tungsten electrode, the diameter, anddesignation in accordance with EN 26848.

± Gas flow rate and nozzle diameter.

4.5.5 Process group 15 (plasma arc welding)

± Plasma gas parameters, e.g. type, nozzle diameter,flow rate.

± Shielding gas flow rate and nozzle diameter.

± Type of torch.

± Plasma current.

± Distance contact tube/work piece.

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Issue 2, November 1997 Page 5EN 288-2 : 1992/A1 : 1997

BSI 1997

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Annex A (informative)

Manufacturers welding procedure specification (WPS)

Location: Examiner or examining body:

Manufacturer's Welding Procedure

Reference No.:

WPAR No.: Method of Preparation and Cleaning:

Parent Material Specification:

Manufacturer:

Welding Process: Material Thickness (mm)

Joint Type Outside Diameter (mm)

Welding Preparation Details (Sketch)1) Welding Position

Joint Design Welding Sequences

Welding Details

Run Process Size ofFiller Metal

CurrentA

VoltageV

Type ofcurrent/Polarity

Wire FeedSpeed

Run-outlength/travelspeed1)

Heatinput1)

Designation of welding consumables and trade name:

Any Special Baking or Drying:

Gas/Flux: shielding Other information1):

backing e.g. weaving (maximum width of run):

Gas Flow Rate: shielding Oscillation: amplitude, frequency, dwell time:

backing Pulse welding details:

Tungsten Electrode Type/Size: Distance contact tube/work piece:

Details of Back Gouging/Backing: Plasma welding details

Preheat Temperature: Torch angle:

Interpass Temperature:

Post-Weld Heat Treatment and/or Ageing:

Time, Temperature, Method:

Heating and Cooling Rates1):

Manufacturer Examiner or examining body

Name, date and signature Name, date and signature

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BSI 1997

BS EN 288-2 : 1992/A1 : 1997

List of references

See national foreword.

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bs 288 - 2

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