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BS EN 288-9-1999 金属材料焊接工艺规范和认可 第9部分:陆地和近海供料管道的现场焊接对接接缝的焊接工艺试验.pdf

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BS EN 288-9-1999 金属材料焊接工艺规范和认可 第9部分:陆地和近海供料管道的现场焊接对接接缝的焊接工艺试验.pdf

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BRITISH STANDARD SapmprpaopetcrceeoirfdviiaucalarlsetoiÐsof fnwoaernlmddientgallic Part 9: Welding procedure test for pipeline welding on land and offshore site butt welding of transmission pipelines 金属材料焊接工艺规范和认可   第 9部分:陆地和近海供料管道的现场 焊接对接接缝的焊接工艺试验 The European Standard EN 288-9:1999 has the status of a British Standard ICS 25.160.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| BS EN 288-9:1999 BS EN 288-9:1999 National foreword This British Standard is the English language version of EN 288-9:1999. The UK participation in its preparation was entrusted by Technical Committee WEE/21, Pipework welding, to Subcommittee WEE/21/7, Field welding, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. 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, the EN title page, pages 2 to 19 and a back cover. The BSI copyright notice displayed throughout this document indicates when the document was last issued. This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 1999 Amendments issued since publication Amd. No. Date Comments © BSI 08-1999 ISBN 0 580 32580 6 EUROPEAN STANDARD NORME EUROPE ENNE EUROPAÈ ISCHE NORM EN 288-9 March 1999 ICS 25.160.10 English version Specification and approval of welding procedures for metallic materials Ð Part 9: Welding procedure test for pipeline welding on land and offshore site butt welding of transmission pipelines Descriptif et qualification d'un mode opeÂratoire de soudage pour les mateÂriaux meÂtalliques Ð Partie 9: Epreuve de qualification d'un mode opeÂratoire de soudage pour le soudage bout a bout de canalisations de transport sur site, sur terre et en mer Anforderung und Anerkennung von Schweiûverfahren fuÈ r metallische Werkstoffe Ð Teil 9: SchweiûverfahrenspruÈ fung fuÈ r baustellengeschweiûte StumpfnaÈhte von Versorgungsrohrleitungen an Land und Offshore This European Standard was approved by CEN on 3 March 1999. 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comite EuropeÂen de Normalisation EuropaÈisches Komitee fuÈ r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 288-9:1999 E Page 2 EN 288-9:1999 Foreword This European Standard has been prepared by Technical Committee 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 September 1999, and conflicting national standards shall be withdrawn at the latest by September 1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Foreword Introduction 1 Scope 2 Normative references 3 Definitions 3.1 repair 3.2 full penetration repair 3.3 internal repair 3.4 make 4 Preliminary welding procedure specification (pWPS) 5 Welding procedure test 6 Test piece 6.1 General 6.2 Shape and dimensions of test pieces 6.3 Welding of test pieces 7 Examination and testing 7.1 Extent of testing 7.2 Location and cutting of test specimens 7.3 Non-destructive examination 7.4 Destructive tests 7.5 Re-testing 8 Range of approval 8.1 General 8.2 Related to the manufacturer 8.3 Related to the material 8.4 Common to all welding procedures 8.5 Specific to processes 8.6 Period of validity 9 Wedling procedure approval record (WPAR) Annex A (normative) Repairs Annex B (informative) A-deviations Annex C (informative) Welding procedure approval record form Page 2 3 3 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 6 6 11 12 12 12 12 13 14 14 14 15 16 17 © BSI 08-1999 Page 3 EN 288-9:1999 Introduction 2 Normative references All new welding procedure approvals are in This European Standard incorporates by dated or accordance with this standard from the date of its issue. undated reference, provisions from other publications. These normative references are cited at the However, this standard does not invalidate previous appropriate places in the text and the publications are welding procedure approvals made to former national listed hereafter. For dated references, subsequent standards or specification, providing the intent of the technical requirements is satisfied and the previous procedure approvals are relevant to the application and production work on which they are employed. 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 Also, where additional tests are carried out to make referred to applies. the welding procedure approval technically equivalent, the additional tests are made on a test piece which should be made in accordance with this standard. Consideration of previous procedure approvals to former national standards or specifications should be made at the time of the enquiry or contract stage and agreed between the contracting parties. EN 288-1, Specification and approval of welding procedures for metallic materials Ð Part 1: General rules for fusion welding. EN 288-2, Specification and approval of welding procedures for metallic materials Ð Part 2: Welding procedure specification for arc welding. EN 439, Welding consumables Ð Shielding gases for 1 Scope arc welding and cutting. This standard specifies how a welding procedure EN 760, Welding consumables Ð Fluxes for submerged specification is approved by welding procedure tests arc welding Ð Classification. for on land and offshore site butt welding of transmission pipelines under normal atmospheric conditions. EN 875, Destructive tests on welds in metallic materials Ð Impact tests Ð Test specimen location, notch orientation and examination. www.bzfxw.com Tests are carried out in accordance with this standard unless additional tests (e.g. CTOD tests and all weld metal tensile tests) are specified by the relevant EN 895, Destructive tests on welds in metallic material Ð Tranverse tensile test. application standard or contract when these apply. EN 970, Non-destructive examination of welds Ð This standard defines the conditions for the execution Visual examination. of welding procedure approval tests and the limits of EN 1043-1, Destructive test on weld in metallic validity of an approved welding procedure for all materials Ð Hardness testing Ð Part 1: Hardness practical welding operations within the range of test on arc welded joints. variables listed in clause 8. EN 1290, Non-destructive examination of welds Ð It applies to the arc welding of steels of groups 1, 2 and 3 according to CR 12187. The principles of this standard can be applied to other fusion welding processes subject to agreement between the contracting parties. Magnetic particle examination of welds. EN 1321, Destructive test on welds in metallic materials Ð Macroscopic and microscopic examination of welds. The requirements for welding procedure specification EN 1435, Non-destructive examination of welds Ð and qualification for hyperbaric and ªwetº welding are Radiographic examination of welded joints. not covered by this supplementary standard. EN 1714, Non-destructive examination of welds Ð Arc welding is covered by the following processes in Ultrasonic examination of welded joints. accordance with EN 24063: EN ISO 6947, Welds Ð Working positions Ð 111 Ð metal-arc welding with covered electrode; Definitions of angles of slope and rotation. (ISO 6947:1993) 114 Ð flux-cored wire metal-arc welding without gas shield; EN 10045-1, Metallic materials Ð Charpy impact test Ð Part 1: Test method. 121 Ð submerged arc welding with wire electrode; EN 24063, Welding, brazing, soldering and braze welding of metals Ð Nomenclature of processes 131 Ð metal-arc inert gas welding, MIG-welding; and reference numbers for symbolic representation 135 Ð metal-arc active gas welding, MAG-welding; 136 Ð flux-cored wire metal-arc welding with active gas shield; on drawings. (ISO 4063:1990) EN ISO 6520-1:1998, Welding and applied processes Ð Classification of geometric imperfections in metallic 141 Ð tungsten inert gas arc welding, materials Ð Part 1: Fusion welding. TIG-welding. (ISO 6520-1:1998) Other fusion welding processes by agreement e.g. metal cored wire arc welding. CR 12187, Welding Ð Guidelines for a grouping system of materials for welding purposes. © BSI 08-1999 Page 4 EN 288-9:1999 3 Definitions For the purposes of this standard, the definitions listed below and in EN 288-1 apply. 3.1 repair any operation which involves welding to rectify the weld, outside the normal welding cycle 3.2 full penetration repair welded repair through the whole thickness of the qualification joint 3.3 internal repair welded repair carried out from the inside surface or the root side of a weld, after excavation and repreparation, using either a single or a multi-pass weld deposition sequence 3.4 make specific trade or brand name of the consumable, but not its designation 4 Preliminary welding procedure specification (pWPS) The preliminary welding procedure specification shall be prepared in accordance with EN 288-2. It shall specify the range for all relevant parameters including the following additional items: Ð steel grade and supply conditions (N, TM, QT steels); Ð number and location of welders; Ð time lapse between start of root pass and start of hot pass; Ð partially completed joint: number of runs before the joint is permitted to cool to ambient temperature; Ð type of line up clamp; Ð time of clamp removal; Ð number of runs completed before lowering off or barge move up; Ð preheating method; Ð method to control cooling. 5 Welding procedure test The making and testing of test pieces representing the type of welding used in production shall be carried out in accordance with clauses 6 and 7 of this standard. When a welding procedure is to be qualified and approved for pipe-reeling, the proposed welding procedures shall include relevant previously documented strain ageing data and/or any additional tests specified. NOTE These tests can include representative strain cycles and accelerated ageing typically for 1 h at 1008 C. Where data regarding pipe material performance/weldability exist, these data shall be considered when selecting suitable welding parameters and conditions for incorporating into the pWPS. Where such data do not exist it can be necessary to carry out preliminary welding trials to establish these data. The welder who undertakes the welding procedure test satisfactorily in accordance with this standard can be approved, by agreement between the contracting parties, for welding on site within the ranges covered by the approved welding procedure specification. 6 Test piece 6.1 General The welded assembly to which the welding procedure will relate in production shall be represented by making a standardized test piece or pieces, as specified in 6.2. 6.2 Shape and dimensions of test pieces Test welds shall be made between whole pipe lengths (if agreed between the contracting parties the length could be reduced to a minimum of one diameter) under simulated site conditions (this may include the application of installation strains). Welding shall follow the pWPS, with removal of line-up clamps, lowering www.bzfxw.com off, partial completion and recommencement where applicable. 6.3 Welding of test pieces Preparation and welding of test pieces shall be carried out in accordance with the pWPS, and under the general conditions of production welding which they shall represent. Welding positions and limitations for the angle of slope and rotation of test piece shall be in accordance with EN ISO 6947 (see also 8.4.2). If tack welds are to be fused into the final joint they shall be included in the test piece. Welding and testing of the test pieces shall be witnessed by an examiner or examining body. 7 Examination and testing 7.1 Extent of testing The testing includes both non-destructive examination (NDE) and destructive testing which shall be carried out in accordance with the requirements of Table 1. When Charpy impact tests are specified for welds exceeding 20 mm thick, they are required at two different thickness locations (see 7.4.3). Repairs outside essential variables need full approval in accordance with annex A. 7.2 Location and cutting of test specimens The location of test specimens shall be in accordance with Figures 1 and 2. Test specimens shall be taken after non-destructive examination (NDE) has shown satisfactory results. It is permitted to take the test specimens from locations avoiding areas showing acceptable imperfections. © BSI 08-1999 Page 5 EN 288-9:1999 Table 1 Ð Examination and testing of the test pieces Test piece Type of test Extent of testing Butt-weld Visual examination (EN 970) 100% Radiographic examination (EN 1435) or Ultrasonic examination (EN 1714) 100 % Surface crack detection 100 % Transverse tensile test (EN 895) 2 test specimens Impact test (EN 875) 2 or 4 sets Hardness test (EN 1043-1) required Macro-examination (EN 1321) 1 test specimen NOTE 1 Magnetic particle examination according to EN 1290. NOTE 2 1 set in the weld metal and 1 set in the HAZ at each location. See also 7.4.3. NOTE 3 Not required for parent metals in ferritic steels with Rm # 430 N/mm2 (Re # 275 N/mm2). Note Ð Ð 1 Ð 2 3 Ð www.bzfxw.com Figure 1 Ð Location of test specimens for a butt-weld in pipe Ð Upwards welding © BSI 08-1999 Page 6 EN 288-9:1999 Figure 2 Ð Location of test specimens for a butt-weld in pipe Ð Downwards welding 7.3 Non-destructive examination 7.3.1 Method After any required post-weld heat treatment and prior to the cutting of test specimens, all test pieces shall be examined visually and non-destructively in accordance with 7.1. For non-post-weld heat treated test pieces, account should be taken of the materials susceptibility to hydrogen induced cracking and consequently the NDE should be delayed. The NDE delay shall be 24 h, unless agreed by the contracting parties or by the relevant application standard. 7.3.2 Acceptance levels A welding procedure is approved if the imperfections in the test piece are within the specified limits given in Table 2. 7.4 Destructive tests For welds carried out by cellulosic coated electrodes, a degassing heat treatment of 250 8C of up to 16 h can be carried out, if necessary according to special requirements. 7.4.1 Transverse tensile testing Tests specimens and testing for transverse tensile testing for butt joints shall be in accordance with EN 895. For pipes > 50 mm outside diameter, the weld reinforcement shall be removed on both faces to give the test specimen a thickness equal to wall thickness of the pipe. Transverse tensile test is acceptable if the test specimen breaks in the parent material or when it breaks in the weld metal with a tensile strength equal to or greater than the specified minimum tensile strength of pipe material. www.bzfxw.com 7.4.2 Macro-examination Test specimens and testing for macro examination shall be in accordance with EN 1321. The acceptance levels stated in 7.3.2 shall apply. 7.4.3 Impact testing In the absence of an application standard, impact testing is required for pipes with specified impact properties and wall thicknesses t $ 12 mm. Test specimens shall be taken and prepared in accordance with EN 10045-1 in such a way that the axis of the notch is perpendicular to the pipe surface. Test specimens and testing for impact test shall be in accordance with this standard for position and temperature of testing, and with EN 875 for dimensions and testing. For weld metal, test specimen type VWT0 and for HAZ specimen type VHT0 shall be used (see Figure 3). From each specified position, each set shall be comprised of three test specimens. Test specimens with Charpy V-notch shall be used and sampled from 1 mm to 2 mm below the inner surface of the pipe and transverse to the weld. When the pipe wall thickness exceeds 20 mm, two more sets are required, in the same circumferential locations, but taken within 1 mm to 2 mm of the outside surface of the pipe. Test temperature and absorbed energy shall be in accordance with the specified design requirements for the complete product, provided the requirements laid down by the application standard are met. © BSI 08-1999 Page 7 EN 288-9:1999 Table 2 Ð Limits for imperfections Imperfection designation EN ISO 6520-1: 1998 reference Limits for imperfections Cracks 100 Not permitted Gas pore Uniformly distributed porosity Linear porosity Elongated cavity Surface pore 2011 Individual gas pores or uniformly distributed 2012 porosity shall be unacceptable when any of 2014 the following conditions exists: 2016 2017 a) the size of an individal pore exceeds 3 mm; b) the size of an individal pore exceeds 25 % of the thinner of the nominal wall thickness joined; c) the total area, when projected radially through the weld shall not exceed 2 % of the projected weld area in the radiograph, consisting of the length of the weld affected by the porosity, with a minimum length of 150 mm multiplied by the maximum width of the weld. Localized (clustered) porosity 2013 Ð Clustered porosity that occurs in any pass except the finish pass shall comply with the criteria of gas pores. Ð Clustered porosity that occurs in the www.bzfxw.com finish pass shall be unacceptable when any of the following conditions exists: a) the diameter of the clustered porosity exceeds 13 mm; b) the aggregate length of clustered porosity in any continuous 300 mm length of weld exceeds 13 mm; c) an individual pore within a clustered porosity exceeds 2 mm in size. Elongated cavity 2015 Unacceptable in the root pass when any of the following conditions exists: a) the length of an individual indication exceeds 50 mm; b) the aggregate length of the elongated cavities in any continuous 300 mm length of weld exceeds 50 mm; c) the aggregate length of the elongated cavities exceeds 15 % of the weld length. Crater pipe 2024 Unacceptable when the maximum length exceeds 2 mm or 30 % of the wall thickness, whichever is the smaller. © BSI 08-1999 Page 8 EN 288-9:1999 Table 2 Ð Limits for imperfections (continued) Imperfection designation EN ISO 6520-1: 1998 reference Limits for imperfections Slag inclusion: Ð linear Ð isolated 301 Unacceptable when any of the following 3011 conditions exists: 3012 a) the length of a linear slag inclusion exceeds 50 mm; NOTE Parallel linear indications separated by approximately the width of the root run (wagon tracks) should be considered as single indications unless the width of either of them exceeds 0,8 mm. In that case, they should be considered as separate indications. b) the aggregate length of linear slag inclusions in any continuous 300 mm length of weld exceeds 50 mm; c) the width of a linear slag inclusion exceeds 1,6 mm; d) the aggregate length of isolated slag inclusions in any continuous 300 mm length of weld exceeds 50 mm; e) the width of an isolated slag inclusion exceeds 3 mm or 50 % of the wall thickness, whichever is less; www.bzfxw.com f) more than four isolated slag inclusions with the maximum width of 3 mm are present in any continuous 300 mm length of weld; g) the aggregate length of linear and isolated slag inclusions exceeds 15 % of the weld length. Metallic inclusions: Ð tungsten Ð copper 304 Unacceptable when any of the following 3041 conditions exists: 3042 a) the size of a copper or tungsten inclusion exceeds 3 mm or 50 % of the wall thickness, whichever is the smaller; b) the aggregate length of copper or tungsten inclusions exceeds 12 mm in any continuous 300 mm length of weld or more than four such inclusions are present in any continuous 300 mm length of weld. Lack of fusion: Ð lack of side wall fusion Ð lack of inter-run fusion 401 Unacceptable when any of the following 4011 conditions exists: 4012 a) the length of an individual indication exceeds 50 mm b) the aggregate length of indications in any continuous 300 mm length of weld exceeds 50 mm; c) the aggregate length of indications exceeds 15 % of the weld length. © BSI 08-1999 Page 9 EN 288-9:1999 Table 2 Ð Limits for imperfections (continued) Imperfection designation EN ISO 6520-1: 1998 reference Limits for imperfections Ð lack of fusion at the root of the weld 4013 Unacceptable, for single sided welds, when any of the following conditions exists: a) the length of an individual indication exceeds 25 mm; b) the aggregate length of indications in any continuous 300 mm length of weld exceeds 25 mm; c) the aggregate length of indications exceeds 8 % of the weld length in any weld less than 300 mm long. Lack of penetration (incomplete penetration) 402 Unacceptable when any of the following conditions exists: a) the length of an individual indication of incomplete penetration exceeds 25 mm; b) the aggregate length of indications of incomplete penetration in any continuous 300 mm length of weld exceeds 25 mm; c) the aggregate length of indications of incomplete penetration exceeds 8 % of the weld length in any weld less than 300 mm long; d) incomplete penetration in double sided welds exceeds 50 mm in total length in any continuous 300 mm of weld length or 15 % of the weld length. Undercut Undercut Shrinkage groove 5011 Unacceptable when any of the following 5012 conditions exists: 5013 a) the aggregate length of undercut, both external and internal, in any continuous 300 mm length of weld exceeds 50 mm; b) the aggregate length of undercut, both external and internal, exceeds 15 % of the weld length. Undercuts shall not be deeper than 1,5 mm or 10 % of the pipe wall thickness, whichever is the smaller. Excess weld metal Excessive penetration 502 Both external and internal reinforcement 504 should not exceed a height of more than 3 mm. © BSI 08-1999 Page 10 EN 288-9:1999 Table 2 Ð Limits for imperfections (continued) Imperfection designation EN ISO 6520-1: 1998 reference Limits for imperfections Linear misalignment 507 Ð Maximum external misalignment permitted: Ð for t # 10 mm : 0,3 t; Ð for 10 mm < t # 20 mm : 3 mm; Ð for t > 20 mm : 0,125 t. Sagging in flat (PA) or overhead (PE) 5092 Burn through 510 Incompletely filled grove 511 Root concavity 515 Accumulation of imperfections Ð Ð Maximum internal misalignment permitted: Ð 1 mm on entire circumference; Ð 2 mm over length D; Ð 2,5 mm over length 1/3 D. Unacceptable. Unacceptable when any of the following conditions exists: a) the maximum dimension exceeds 6 mm and the density of the burn through of the radiographic image exceeds that of the thinnest adjacent parent metal; b) the maximum dimension exceeds the thinner of the nominal wall thicknesses joined, and the density of the burn through of the radiographic image exceeds that of the thinnest adjacent parent metal; c) more than one burn through of any size is present and the density more than one of the radiographic images exceeds that of the thinnest adjacent parent metal. Unacceptable. Root concavity up to 25 % of the total length of weld, is acceptable, provided the density of the radiographic image of the root concavity does not exceed that of the thinnest adjacent parent metal. For areas that exceed the density of the thinnest adjacent parent metal, the criteria for burn through (510) are applicable. Any accumulation of imperfections shall be unacceptable when any of the following conditions exists: a) the aggregate length of indications in any continuous 300 mm length of weld exceeds 50 mm; b) the aggregate length of indications exceeds 15 % of the weld length. © BSI 08-1999 Page 11 EN 288-9:1999 Dimensions in millimetres Figure 3a Ð For all wall thicknesses Figure 3b Ð Additional for wall thicknesses > 20 mm Figure 3 Ð Position of Charpy-V notch test specimens 7.4.4 Hardness testing The hardness testing shall be in accordance with EN 1043-1. The Vickers method HV10 shall be used. The indentation shall be made in the weld, the HAZs and the parent metal with the object of measuring and recording the range of values in the weld joint. This will include rows of indentation one of which shall be 2 mm maximum below each surface. For each row of indentation there shall be a minimum of three individual indentations in each part of the weld, the HAZ (both sides) and the parent metal (both sides). For the HAZ the first indentation shall be placed as close to the fusion line as possible. The results from the hardness test shall meet the requirements given in Table 3. 7.5 Re-testing If the test piece fails to comply with any of the requirements for visual examination or NDE specified in 7.3.2, one further test piece shall be welded and subjected to the same examination. If this additional test piece does not comply with the relevant requirements, the pWPS shall be regarded as not capable of complying with the requirements of this standard without modification. If any test specimen fails to comply with the relevant requirements of 7.4 only due to geometric weld imperfections, two further test specimens shall be obtained for each one that failed. These can be taken from the same test piece if there is sufficient material available or from a new test piece, and shall be subjected to the same test. If either of these additional test specimens does not comply with the relevant requirements, the pWPS shall be regarded as not capable of complying with the requirements of this standard without modification. Table 3 Ð Permitted maximum hardness values HV10 Hardness location Weld metal Root Cap Heat-affected zone Root Cap Sour service, any process: t < 9,5 mm; 250 275 250 275 t $ 9,5 mm. 250 275 250 300 Non-sour service: Ð manual welding with cellulosic electrodes; 275 275 275 325 Ð other welding processes. 275 275 350 350 © BSI 08-1999 Page 12 EN 288-9:1999 8 Range of approval 8.1 General All the conditions of validity stated below shall be met independently of each other. Changes outside of the ranges specified shall require a new welding procedure test. 8.2 Related to the manufacturer An approval of a WPS obtained by a manufacturer is valid in workshops or sites under the same technical and quality control of that manufacturer. 8.3 Related to the material 8.3.1 Parent metal 8.3.1.1 Grouping system Steel grades are grouped in accordance with CR 12187 (groups 1, 2 and 3). A welding procedure test carried out with one of the steel grades of a group covers for steel grades with lower or equal specified minimum yield strength of that group but does not cover steel grades with higher specified minimum yield strength. A change of supply conditions requires a reapproval of the welding procedure test in all cases. In addition a reapproval of the welding procedure test is required, if the ladle analysis differs from that tested by more than the amount defined in Table 4: Ð for group 1.1 steels when CTOD test is required; Ð for groups 1.2 and 1.3 steels when either impact test or CTOD test is required; Ð for groups 2 and 3 steels. Table 4 Ð Qualified ranges of chemical analysis Element Value tested Values qualified Part 1 Carbon Manganese Silicon Any Value tested ±0,04 % Any Value tested ±0,25 % Any Value tested ±0,20 % Sulfur Not over 0,008 % Up to 0,015 % over the value tested Over 9,008 % Not less than 0,009 %, up to 0,015 % over the value tested Phosphorus Carbon equivalent1) Any Up to 0,015 % over value tested Any Value tested 20,06 % or +0,03 %2)3) Part 24) Aluminium(tot) Not over 0,015 % Not less than value tested Over 0,015 % Value tested ±0,030 % but shall be between 0,016 % and 0,060 % Niobium Vanadium Nickel Any Value tested 20,02 % or +0,01 % Any Value tested ±0,03 % Any Value tested ±0,10 % Copper Any Value tested 20,20 % or +0,10 % Chromium Any Value tested 20,10 % or +0,05 % Molybdenum Titanium Any Value tested 20,10 % or +0,05 % Any Value tested ±0,005 % Part 35) Nitrogen Any Value tested +0,004 % Calcium Not over 0,004 % Not over 0,004 % Over 0,004 % Not over value tested 1) Carbon equivalent = % C + % Mn/6 + (% Cr + % Mo + % V)/5 + (% Ni + % Cu)/15. 2) The client may specify a lower maximum for sour service. 3) For steels of carbon equivalent $ 0,4 % increase preheat can be needed 4) The ªvalues qualifiedº limits in this part apply only where impact testing is required, or where the material tested has a carbon equivalent exceeding 0,43 % 5) Measurement of elements of this part is not required unless CTOD testing is required and the material tested has a carbon equivalent exceeding 0,40 %. © BSI 08-1999 Page 13 EN 288-9:1999 8.3.2 Parent metal thickness and pipe diameter 8.3.2.1 Thickness The approval of a welding procedure test on thickness t shall include approval for thicknesses in the following ranges given in Table 5, provided this does not conflict with the impact test requirements of 7.4.3. 8.3.2.2 Pipe diameter The approval of a welding procedure test on outside diameter D shall include approval for diameters in the range 0,5 D to 2 D. 8.4 Common to all welding procedures 8.4.1 Welding process The approval is valid only for the welding process used in the welding procedure test. In a multi-process procedure the approval is only valid for the order used in the welding procedure test. 8.4.2 Welding positions The range of approval for welding position is ±258 of the position tested, except for position PA according to EN ISO 6947 which is qualified by position PF or PG. 8.4.3 Type of joint Any change in joint configuration outside tolerances specified in the WPS requires a reapproval of the welding procedure test. 8.4.4 Filler metal designation Where the filler metal designation is based on tensile or yield strengths the approval of one filler metal shall approve the others within the same specified group except where impact properties are required to be demonstrated. Where the filler metal designation is based on chemical composition the approval of one filler metal shall approve others within the same specified chemical group. A change of type of coating or flux e.g. basic/rutile/cellulosic shall entail reapproval of the welding procedure. 8.4.5 Filler metal make When impact testing is required, the approval given is only applicable to the specific make used in the welding procedure test. It is permissible to change the specific make of filler metal to another with the same compulsory part of the classification when an additional test piece is welded. This test piece shall be welded using the identical welding parameters as the original weld procedure test and only weld metal impact test specimens shall be tested. NOTE This provision does not apply to solid wire and rods with the same classification and nominal chemical compositions. 8.4.6 Type of current The approval given is the type of current (a.c., d.c., pulsed current) and the polarity used in the welding procedure test. 8.4.7 Heat input The requirements of this clause only apply when the control of heat input is specified. When impact requirements apply, the upper limit of heat input approved is 15 % greater than that used in the welding procedure test. The lower limit of heat input approved is 15 % lower than that used in the welding procedure test. 8.4.8 Preheat temperature The lower limit of approval is the preheat temperature used in the welding procedure test. 8.4.9 Interpass temperature The upper limit of approval is the interpass temperature used in the welding procedure test and shall not exceed 250 8C. 8.4.10 Post-heating When post-heating is carried out as a part of the WPS, the time and the temperature of the post-heating shall be not less than those reached in the welding procedure test. 8.4.11 Post-weld heat-treatment Addition or deletion of post-weld heat-treatment is not permitted. The temperature range approved is the holding temperature used in the welding procedure test ±20 8C unless otherwise specified. Where required, heating rates, cooling rates and holding time shall be related to the production assembly. 8.4.12 Removal of line up clamp The line up clamp shall not be removed when the length of weld (in % of circumference) or number of runs is less than that reached in the welding procedure test. Table 5 Ð Range of approval for thickness Thickness of the test piece t Steel Re # 275 N/mm2 3 < t # 12 3 to 2 t 12 < t # 100 0,5 t to 2 t (max. 150) Range of approval Steel 275 < Re # 360 N/mm2 0,8 t to 1,5 t 0,8 t to 1,5 t Dimensions in millimetres Steel Re = 360 N/mm2 0,8 t to 1,25 t 0,8 t to 1,25 t © BSI 08-1999 Page 14 EN 288-9:1999 8.4.13 Time interval The requirements of this clause shall only apply when cellulosic electrodes are used. The approval given is restricted to time lapses not exceeding that recorded in the welding procedure test. 8.4.14 Number of welders The approval given is restricted to the minimum number of root run and hot pass welders used in the welding procedure test. The number of welders used for filling passes can be different but shall at least be equal to that recorded in the welding procedure test. 8.4.15 Partially completed joint The approval given is restricted to welds which have at least as many runs deposited before cooling below preheat temperature as recorded in the welding procedure test. 8.5 Specific to processes 8.5.1 Processes 111 and 114 The approval given is for the diameter of electrode used in the welding procedure test plus or minus one electrode diameter size for each run, with the exception of the two first layer and the capping layer on single sided without backing butt-welds for which no size change is permissible. 8.5.2 Process 121 The approval given is restricted to the wire system and wire diameters used in the welding procedure test (e.g. single-wire or multiple-wire system). The approval given for the flux is restricted to the make and classification according to EN 760 used for the procedure welding test. 8.5.3 Processes 131, 135 and 136 The approval given to the face and/or back shielding gas is restricted to the type of gas (nominal composition) according to EN 439 used in the welding procedure test. The approval given is restricted to the wire system used in the welding procedure test (e.g. single-wire or multiple-wire system). 8.5.4 Process 141 The approval given to the face and/or back shielding gas is restricted to the type of gas (nominal composition) according to EN 439 used in the welding procedure test. A test made without back shielding gas covers welding back shielding gas. 8.5.5 Face shielding gas flow rate For processes 131, 135, 136, and 141 the face shielding gas flow rate shall not change by more than 10 %. 8.6 Period of validity The period of use of a WPAR is unlimited. 9 Welding procedure approval record (WPAR) The welding procedure approval record (WPAR) is a statement of the results of assessing each test piece including re-tests. The relevant items listed for the WPS in EN 288-2 shall be included, together with details of any features that would be rejectable by the requirements of clause 7. If no rejectable features or unacceptable test results are found, a WPAR detailing the welding procedure test piece results is approved and shall be signed and dated by the examiner or examining body. A WPAR-format shall be used to record details for the welding procedure and the test results, in order to facilitate uniform presentation and assessment of the data. An example of the WPAR-format is shown in annex C. © BSI 08-1999 Page 15 EN 288-9:1999 Annex A (normative) Repairs Before beginning production, the contractor shall qualify the weld repair procedure applicable to groups 2 and 3 steels according to CR 12187. For a joint made in accordance with 6.3, and which has been or is subsequently shown to be as satisfactory, in accordance with Table 1, the procedures shall include two types of repair: Ð a full penetration repair; Ð an internal repair if the pipe diameter allows it. The groove for the repairs shall be made in the axis of the weld, and located according to Figures A.1 and A.2. NOTE Rotation of the pipe is permissible to avoid overlap with the main weld procedure testing. The testings shall be carried out in accordance with 7.3 and 7.4. Figure A.1 Ð Location of type of repairs Ð Upwards welding Figure A.2 Ð Location of type of repairs Ð Composite welding (root pass upwards, filling downwards) © BSI 08-1999 Page 16 EN 288-9:1999 Annex B (informative) A-deviations A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the competence of the CEN/CENELEC member. This European Standard falls under Directive 97/23. NOTE (from CEN/CENELEC Internal Regulations Part 2:1994, 3.1.9): Where standards fall under EU Directives, it is the view of the Commission of the European Communities (OJ No C 59, 9.3.1982) that the effect of the decision of the Court of Justice in case 815/79 Cremonini/Vrankovich (European Court Reports 1980, p. 3583) is that compliance with A-deviations is no longer mandatory and that the free movement of products complying with such a standard should not be restricted within the EU except under the safeguard procedure provided for the relevant Directive. A-deviations in an EFTA country are valid instead of the relevant provisions of the European Standard in that country until they have been removed. Clause A-deviation SWEDEN 7.3.2 According to Ordinance AFS 1994:39 concerning ªPressure Vesselsº issued by the National Swedish Board of Occupational Safety and Health, chapter 4, sections 6, 11 and 12, the clauses which cause the request of A-deviations are the following: In Table 2, for linear misalignment (507), change the limits given by the following ones: Ð maximum external misalignment permitted: Ð for t # 5 mm : 0,5 t, max. 1 mm; Ð for 5 mm < t # 10 mm : 0,2 t; Ð for t > 10 mm : 0,1 t, max. 4 mm. Ð maximum internal misalignment permitted: Ð for t # 5 mm : 0,5 t, max. 1 mm; Ð for t > 5 mm : 0,05(t-5) + 1, max. 2 mm. © BSI 08-1999 Page 17 EN 288-9:1999 Annex C (informative) Welding procedure approval record form Welding procedure approval Ð Test certificate (WPAR) Manufacturer's welding procedure Reference no.: Manufacturer: Address: Code/testing standard: Date of welding: Examiner or examining body: Reference no.: Extent of approval Welding process: Joint type: Parent metal(s) Supply conditions: Metal thickness (mm): Outside diameter (mm): Filler metal type: Shielding gas/flux: Type of welding current: Welding positions: Preheat: Post-weld heat treatment and/or ageing: Other information: Ð Time lapse between start of root pass and start of hot pass: Certified that test welds prepared, welded and tested satisfactorily in accordance with the requirements of the code/testing standard indicated above. Location Date of issue Examiner or examining body Name, date and signature © BSI 08-1999 Page 18 EN 288-9:1999 Test results Manufacturer's welding procedure Reference no.: Visual examination: Magnetic particle examination*: Examiner or examining body: Reference no.: Radiographic examination*: Ultrasonic examination*: Temperature: Tensile tests Type/no. Requirement Re Rm A % on Z% N/mm2 N/mm2 Fracture location Remarks Macro examination: Impact test* Notch location/direction Type: Temperature 8C Size: Values 123 Average Requirement: Remarks Hardness tests* Location of measurements (Sketch*) Type/load Parent metal: HAZ: Weld metal: Other tests: Remarks: Tests carried out in accordance with the requirements of: Laboratory report reference no.: Test results were acceptable/not acceptable (Delete as appropriate) Test carried out in the presence of: Name date and signature Examiner or examining body * If required. © BSI 08-1999 Page 19 EN 288-9:1999 Detail of weld test Location: Manufacturer's welding procedure Reference no.: WPAR no.: Manufacturer: Welder's name: Welding process: Joint type: Weld preparation details (Sketch)*: Joint design Examiner or examining body Method of preparation and cleaning; Parent material specification: Material thickness (mm): Outside diameter (mm): Welding position: Welding sequences Welding details Run Process Size of filler metal Current A Voltage V Type of current/ polarity Wire feed Run out length/ travel speed* Heat input* Filler metal designation and trade name: Any special backing or drying: Gas/flux: shielding: backing: Gas flow rate Ð shielding: backing: Tungsten electrode type/size: Details of back gouging/backing: Preheat temperature: Interpass temperature: Post-weld heat treatment and/or ageing: Time, temperature, method: Heating and cooling rates*: Manufacturer Name, date and signature * If required. © BSI 08-1999 Other information*: e.g.: weaving (maximum width of run): Oscillation: amplitude, frequency, dwell time: Pulse welding details: Stand off distance: Torch angle: Examiner or examining body Name, date and signature BS EN 288-9:1999 BSI 389 Chiswick High Road London W4 4AL BSI Ð British Standards Institution ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| BSI is the independent national body responsible for preparing British Standards. 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