SIST EN ISO 11970:2007

SLOVENSKI STANDARD
SIST EN ISO 11970:2007
01-december-2007
Popis in odobritev varilnih postopkov za proizvodno varjenje jeklenih ulitkov (ISO
11970:2001)
Specification and approval of welding procedures for production welding of steel castings
(ISO 11970:2001)
Schweißverfahrensprüfung für das Produktionsschweißen von Stahlguss (ISO
11970:2001)
Descriptif et qualification d'un mode opératoire de soudage pour le soudage de
production sur aciers moulés (ISO 11970:2001)
Ta slovenski standard je istoveten z: EN ISO 11970:2007
ICS:
25.160.10 Varilni postopki in varjenje Welding processes
77.140.80 Železni in jekleni ulitki Iron and steel castings
SIST EN ISO 11970:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN ISO 11970
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2007
ICS 25.160.10; 77.140.80

English Version
Specification and approval of welding procedures for production
welding of steel castings (ISO 11970:2001)
Descriptif et qualification d'un mode opératoire de soudage Anforderungen und Anerkennung von Schweißverfahren für
pour le soudage de production sur aciers moulés (ISO das Produktionsschweißen von Stahlguss (ISO
11970:2001) 11970:2001)
This European Standard was approved by CEN on 24 June 2007.
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 CEN Management Centre 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 CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11970:2007: E
worldwide for CEN national Members.

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EN ISO 11970:2007 (E)






Foreword



The text of ISO 11970:2001 has been prepared by Technical Committee ISO/TC 17 "Steel” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO
11970:2007 by Technical Committee ECISS/TC 31 "Steel castings", the secretariat of which is
held by AFNOR.

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 January 2008, and conflicting national
standards shall be withdrawn at the latest by January 2008.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United
Kingdom.


Endorsement notice

The text of ISO 11970:2001 has been approved by CEN as EN ISO 11970:2007 without any
modifications.

2

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INTERNATIONAL ISO
STANDARD 11970
First edition
2001-01-15
Specification and approval of welding
procedures for production welding of steel
castings
Descriptif et qualification d'un mode opératoire de soudage pour le
soudage de production sur aciers moulés
Reference number
ISO 11970:2001(E)
©
ISO 2001

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ISO 11970:2001(E)
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ii © ISO 2001 – All rights reserved

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ISO 11970:2001(E)
Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Preliminary welding procedure specification (pWPS) .2
5 Welding procedure test.3
6 Test piece .3
7 Examination and testing .5
8 Range of approval.8
9 Welding procedure approval record (WPAR) .12
Annex A (informative) Welding procedure approval — Record form (WPAR) welding procedure
approval — Test certificate.13
Annex B (normative) Details of weld test .14
© ISO 2001 – All rights reserved iii

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ISO 11970:2001(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards 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 organizations, 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 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 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.
Annex B forms a normative part of this International Standard. Annex A is for information only.
iv © ISO 2001 – All rights reserved

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ISO 11970:2001(E)
Introduction
All welding procedure approvals for production welding of steel castings shall be in accordance with this
International Standard from the date of 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.
© ISO 2001 – All rights reserved v

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INTERNATIONAL STANDARD ISO 11970:2001(E)
Specification and approval of welding procedures for production
welding of steel castings
1 Scope
This International Standard specifies how a welding procedure specification (WPS) for production welding of steel
castings 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 Standard 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 agreement 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, chemical analyses, ferrite determination in austenitic stainless steels,
elongation, Charpy “V” impact tests, radiography, etc.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For 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. For
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 welding 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.
1)
ISO 4992:— , Steel castings — Ultrasonic inspection.
ISO 4993:1987, Steel castings — Radiographic inspection.
1) To be published.
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ISO 11970:2001(E)
2)
ISO 5817:— , Welding — Fusion-welded joints in 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 method.
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.
3)
ISO 9692-1:— , Welding and allied processes — Recommendations for 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 procedures for metallic materials — Part 2: Welding
procedure specification for arc welding.
3 Terms 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 during 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 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
4 Preliminary welding procedure specification (pWPS)
A preliminary welding procedure specification shall be prepared. It shall 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)
2 © ISO 2001 – All rights reserved

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ISO 11970:2001(E)
5 Welding procedure test
The making and testing of test pieces representing 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. Additional welders shall be qualified in
accordance with 7.6.
6 Test piece
6.1 General
The test piece shall be in accordance with that shown in Figure 1.
6.2 Shape 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
and/or retesting specimens (in accordance with 7.5).
6.3 Welding 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 dimensions 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 examiner (or test body). When the examiner (or test body) is not specified in the purchase
order the manufacturer may appoint a suitable examiner.
© ISO 2001 – All rights reserved 3

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ISO 11970:2001(E)
Dimensions in millimetres
a) Plate
b) Tube
Key
1 Discard
2 Inspection length
NOTE The dimensions shown are for information only and may be adjusted to meet production and testing requirements.
a
c=3tW 150 mm.
b
b =6tW 350 mm.
c
tW 15 mm.
d
t W 0,5t.
1
e
a =5mm to15mm or�=5° to 20°.
f
Edge preparation and fit-up as detailed in the preliminary Welding Procedure Specification (pWPS).
g
eW 150 mm.
h
d = outside diameter.
Figure 1 — Test piece
4 © ISO 2001 – All rights reserved

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ISO 11970:2001(E)
7 Examination and testing
7.1 Extent of testing
The examination and testing includes both non-destructive examination (NDE) and destructive testing (DT) which
shall be in accordance with the requirements of Table 1.
Table 1 — Examination and testing of the test pieces
Type of test Extent
Visual 100 %
a b
100 %
Radiographic or ultrasonic
c
100 %
Surface crack detection
1specimen
Transverse tensile test
d
2sets
Impact test
if required by the purchase order or by the relevant application standard
Hardness test
if required by the purchase o
...