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1、Reference number ISO 11970:2001(E) ISO 2001 INTERNATIONAL STANDARD ISO 11970 First edition 2001-01-15 Specification and approval of welding procedures for production welding of steel castings Descriptif et qualification dun mode opratoire de soudage pour le soudage de production sur aciers mouls ISO
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5、n below. ISO 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member
6、body in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2001 All rights reserved -,-,- ISO 11970:2001(E) ISO 2001 All rights reservediii ContentsPag
7、e Foreword.iv Introduction.v 1Scope 1 2Normative references1 3Terms and definitions .2 4Preliminary welding procedure specification (pWPS).2 5Welding procedure test.3 6Test piece .3 7Examination and testing .5 8Range of approval8 9Welding procedure approval record (WPAR) .12 Annex A (informative) We
8、lding procedure approval Record form (WPAR) welding procedure approval Test certificate.13 Annex B (normative) Details of weld test .14 -,-,- ISO 11970:2001(E) iv ISO 2001 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national stan
9、dards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International org
10、anizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given
11、 in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility
12、 that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 11970 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 11, Steel castings. A
13、nnex B forms a normative part of this International Standard. Annex A is for information only. ISO 11970:2001(E) ISO 2001 All rights reservedv Introduction All welding procedure approvals for production welding of steel castings shall be in accordance with this International Standard from the date o
14、f its issue. Previous procedure approvals that conform to the range of approval of clause 8 are valid under this International Standard. Where additional tests have to be carried out to complete the approval it is only necessary to perform the additional tests to the requirements of clauses 6 and 7.
15、 -,-,- -,-,- INTERNATIONAL STANDARDISO 11970:2001(E) ISO 2001 All rights reserved1 Specification and approval of welding procedures for production welding of steel castings 1Scope This International Standard specifies how a welding procedure specification (WPS) for production welding of steel castin
16、gs is approved, It defines the conditions for the execution of welding procedure approval tests and the limits of validity of an approved welding procedure for all practical welding operations within the range of essential variables. Tests shall be carried out in accordance with this International S
17、tandard unless additional tests are specified by the purchaser or by agreement between the contracting parties. This International Standard applies to the arc welding of steel castings. The principles of this International Standard may be applied to other fusion welding processes subject to agreemen
18、t between the contracting parties. In the case of specific service, material or manufacturing conditions, more comprehensive tests may be specified by the purchaser, than are specified by this International Standard, in order to gain more information, e.g. longitudinal weld tensile tests, bend tests
19、, chemical analyses, ferrite determination in austenitic stainless steels, elongation, Charpy “V” impact tests, radiography, etc. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. Fo
20、r dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Fo
21、r undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 148:1983, Steel Charpy impact test (V-notch). ISO 857-1:1998, Welding and allied processes Vocabulary Part 1: Metal weldin
22、g processes. ISO 4969:1980, Steel Macroscopic examination by etching with strong mineral acids. ISO 4986:1992, Steel castings Magnetic particle inspection. ISO 4987:1992. Steel castings Penetrant inspection. ISO 4992:1), Steel castings Ultrasonic inspection. ISO 4993:1987, Steel castings Radiographi
23、c inspection. 1)To be published. ISO 11970:2001(E) 2 ISO 2001 All rights reserved ISO 5817:2), Welding Fusion-welded jointsin steel, nickel, titanium and their alloys(beam welding excluded) Quality levels for imperfections. ISO 6507-1:1997, Metallic materials Vickers hardness test Part 1: Test metho
24、d. ISO 6892:1998, Metallic Materials Tensile testing at ambient temperature. ISO 6947:1990, Welds Working positions Definition of angles of slope and rotation. ISO 9606-1:1994, Approval testing of welders Fusion welding Part 1: Steels. ISO 9692-1:3), Welding and allied processes Recommendations for
25、joint preparation Part 1: Manual metal- arc welding, gas-shielded metal-arc welding and gas welding of steels. ISO 9956-1:1995, Specification and approval of welding procedures for metallic materials Part 1: General rules for fusion welding. ISO 9956-2:1995, Specification and approval of welding pro
26、cedures for metallic materials Part 2: Welding procedure specification for arc welding. 3Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 857-1 and ISO 9956-1 as well as the following apply. 3.1 production welding any welding carried out d
27、uring manufacturing before final delivery to the purchaser including joint welding of castings and finishing welding 3.1.1 joint welding welding used to weld cast components together or weld cast components to wrought steels in order to obtain an integral unit 3.1.2 finishing welding welding carried
28、 out in order to ensure the agreed quality of the casting 3.2 repair welding any welding carried out after delivery to the end user, i.e. after the casting has been in service 4Preliminary welding procedure specification (pWPS) A preliminary welding procedure specification shall be prepared. It shal
29、l specify the range of all the relevant parameters according to ISO 9956-2. 2)To be published. (Revision of ISO 5817:1992) 3)To be published. (Partial revision of ISO 9692:1992) -,-,- ISO 11970:2001(E) ISO 2001 All rights reserved3 5Welding procedure test The making and testing of test pieces repres
30、enting the type and the position of welding used in production shall be in accordance with clauses 6 and 7. The welder who undertakes the welding procedure test satisfactorily in accordance with this International Standard is approved for the appropriate range of approval according to ISO 9606-1. Ad
31、ditional welders shall be qualified in accordance with 7.6. 6Test piece 6.1General The test piece shall be in accordance with that shown in Figure 1. 6.2Shape and dimensions of test piece Additional test pieces, or longer test pieces than the minimum size may be prepared in order to allow for extra
32、and/or retesting specimens (in accordance with 7.5). 6.3Welding of test piece The preparation and welding of the test piece shall be carried out in accordance with the relevant pWPS. Angular tolerances may be agreed between the contracting parties or by the relevant application standard. The dimensi
33、ons and shape of the groove shall be in accordance with ISO 9692-1. If tack welds are to be fused into the final joint they shall be included in the test piece. Unless otherwise specified in the purchase order or contract review, welding and testing of the test piece(s) shall be witnessed by an exam
34、iner (or test body). When the examiner (or test body) is not specified in the purchase order the manufacturer may appoint a suitable examiner. -,-,- ISO 11970:2001(E) 4 ISO 2001 All rights reserved Dimensions in millimetres a) Plate b) Tube Key 1Discard 2Inspection length NOTEThe dimensions shown ar
35、e for information only and may be adjusted to meet production and testing requirements. a c = 3t W 150 mm. b b = 6t W 350 mm. c t W 15 mm. d t1W 0,5t. e a = 5 mm to 15 mm or ? = 5 to 20. f Edge preparation and fit-up as detailed in the preliminary Welding Procedure Specification (pWPS). g e W 150 mm
36、. h d = outside diameter. Figure 1 Test piece -,-,- ISO 11970:2001(E) ISO 2001 All rights reserved5 7Examination and testing 7.1Extent of testing The examination and testing includes both non-destructive examination (NDE) and destructive testing (DT) which shall be in accordance with the requirement
37、s of Table 1. Table 1 Examination and testing of the test pieces Type of testExtent Visual Radiographicaor ultrasonic b Surface crack detection c Transverse tensile test Impact test d Hardness test Macro-examination Micro-examination Bend tests Corrosion tests Additional tests 100 % 100 % 100 % 1 sp
38、ecimen 2 sets if required by the purchase order or by the relevant application standard if required by the purchase order or by the relevant application standard if required by the purchase order or by the relevant application standard if required by the purchase order or by the relevant application
39、 standard if required by the purchase order or by the relevant application standard if required by the purchase order or by the relevant application standard a Radiographic testing shall be carried out in accordance with ISO 4993. b Ultrasonic testing shall be carried out in accordance with ISO 4992
40、. c Magnetic particle testing in accordance with ISO 4986 or, dye penetrant in accordance with ISO 4987. d Impact V-notch tests are only required when the parent metal requires impact testing The same number of tests are required in the weld metal and HAZ. All tests shall be carried out after any re
41、quired post weld heat treatment. 7.2Location and cutting of test pieces Location and cutting of test pieces shall be in accordance with Figure 2. Test pieces shall be taken after non-destructive examination (NDE) has given satisfactory results. 7.3Non-destructive examination The quality requirements
42、 of the HAZ shall be in accordance with the requirements for the parent metal. The acceptance requirements of the weld deposit shall comply with level C of ISO 5817:1982 except for excess weld metal and excessive convexity for which level D shall apply. Standards for acceptance criteria relating to
43、NDE methods shall be used for the evaluation of imperfections. -,-,- ISO 11970:2001(E) 6 ISO 2001 All rights reserved Dimensions in millimetres Key 1Discard a Area 1 for: 1 tensile specimen b Area 2 for: Impact and additional test specimens if required c Area 3 for: 1 macro/micro test specimen 1 har
44、dness test specimen a) Plate Key 1Top for fixed pipe a Area 1 for: 1 tensile specimen 1 root and 1 face or 2 side bend specimens b Area 2 for: impact and additional test specimens if required c Area 3 for: 1 tensile specimen 1 root and 1 face or 2 side bend specimens d Area 4 for: 1 macro test speci
45、men 1 hardness test specimen 2 side bend specimens b) Tube Figure 2 Location of test specimens -,-,- ISO 11970:2001(E) ISO 2001 All rights reserved7 7.4Destructive test 7.4.1Transverse (to weld groove) tensile test Specimens and testing for transverse tensile testing shall be in accordance with ISO
46、6892. The results of the tensile tests shall correspond to the specified values for the parent metal. If the specimen breaks outside of the weld or fusion line, the result is acceptable if the strength is not more than 5 % below the minimum tensile strength of the parent metal piece. 7.4.2Macro-exam
47、ination If macro examination is required the test specimen shall be prepared and etched on one side to clearly reveal the fusion line, the HAZ and the build up of runs, in accordance with ISO 4969. Unaffected parent metal shall be included in the macro-examination. The acceptance levels stated in 7.
48、3 shall apply. 7.4.3Micro-examination If micro-examination is required the test specimen shall be prepared and etched on one side to clearly reveal the fusion line, the structure of the weld and the HAZ. The acceptance level is to be agreed between the supplier and customer or application standard. 7.4.4Impact testing If impact testing is required the sets of test specimens shall be taken in accor