Metallic materials - Method of test for the determination of quasistatic fracture toughness of welds (ISO 15653:2018)

ISO 15653:2018 specifies methods for determining fracture toughness in terms of stress intensity factor (K), crack tip opening displacement or CTOD (δ) and experimental equivalent of the J-integral for welds in metallic materials (J).
ISO 15653:2018 complements ISO 12135, which covers all aspects of fracture toughness testing of parent metal and which needs to be used in conjunction with this document. This document describes methods for determining point values of fracture toughness. It should not be considered a way of obtaining a valid R-curve (resistance-to-crack-extension curve). However, the specimen preparation methods described in this document could be usefully employed when determining R-curves for welds. The methods use fatigue precracked specimens which have been notched, after welding, in a specific target area in the weld. Methods are described to evaluate the suitability of a weld for notch placement within the target area, which is either within the weld metal or within the weld heat-affected zone (HAZ), and then, where appropriate, to evaluate the effectiveness of the fatigue crack in sampling these areas.

Metallische Werkstoffe - Prüfverfahren zur Bestimmung der quasistatischen Bruchzähigkeit von Schweißnähten (ISO 15653:2018)

Diese Internationale Norm legt Verfahren zur Bestimmung der Bruchzähigkeit mit dem K–Konzept (Spannungsintensitätsfaktor), dem CTOD-Konzept (Rissspitzenöffnungsverschiebung, δ) und dem J Integralkonzept (experimentelles Äquivalent für das J-Integral) für Schweißungen an metallischen Werkstoffen fest.
Diese Internationale Norm ist ein Zusatz zu ISO 12135, die alle Aspekte der Bruchzähigkeitsprüfung von Grundwerkstoffen abdeckt und in Verbindung mit diesem Dokument verwendet werden muss. Diese Internationale Norm beschreibt Verfahren für die Bestimmung von Einzelwerten der Bruchzähigkeit. Sie sollte nicht zur Bestimmung einer R-Kurve (Risswiderstandskurve) herangezogen werden. Dies betrifft nicht die in dieser Internationalen Norm beschriebene Methodik zur Probenpräparation, die auch bei der Bestimmung von R-Kurven von Schweißungen hilfreich eingesetzt werden könnte. Im vorliegenden Verfahren werden Proben mit Ermüdungsrissen verwendet, die nach dem Schweißen in einen definierten Bereich der Schweißnaht eingebracht werden. Dabei handelt es sich entweder um das Schweißgut oder die Wärmeeinflusszone (WEZ) der Schweißnaht. Es wird eine Methodik beschrieben, die die Effektivität der realisierten Kerblage für Ermüdungsrisseinbringung und Prüfung nachweist.

Matériaux métalliques - Méthode d'essai pour la détermination de la ténacité quasi statique à la rupture des soudures (ISO 15653:2018)

ISO 15653:2018 spécifie des méthodes permettant de déterminer la ténacité à la rupture en termes de facteur d'intensité de contrainte (K), d'écartement à fond de fissure, CTOD (δ) et d'équivalent expérimental de l'intégrale pour les soudures dans les matériaux métalliques (J).
ISO 15653:2018 complète l'ISO 12135, qui couvre tous les aspects des essais de ténacité à la rupture du métal de base et qui doit être utilisée conjointement avec le présent document. Ce document décrit des méthodes de détermination des valeurs ponctuelles de la ténacité à la rupture. Elle ne doit pas être considérée comme étant une méthode permettant d'obtenir une courbe R valide (résistance à la propagation de fissure). Cependant, les méthodes de préparation des éprouvettes décrites dans la présente Norme internationale peuvent être employées utilement lors de la détermination des courbes R pour les soudures. La présente méthode utilise des éprouvettes préfissurées par fatigue qui ont été entaillées, après soudage, dans une surface cible spécifique de la soudure. Les méthodes sont décrites pour évaluer l'adaptabilité d'une soudure à l'emplacement des entailles dans la surface cible qui se trouve soit dans la zone fondue soit dans la zone de soudure affectée thermiquement (ZAT) puis, en cas de besoin, pour évaluer l'efficacité de la fissuration par fatigue lors de la traversée de ces surfaces.

Kovinski materiali - Preskusna metoda za ugotavljanje kvazistatične lomne žilavosti zvarnih spojev (ISO 15653:2018)

Ta dokument določa metode za ugotavljanje lomne žilavosti glede na koeficient lomne žilavosti (K), premik vrha odprtja razpoke ali CTOD (δ) ter preskusni ekvivalent integrala J zvarnih spojev v kovinskih materialih (J).
Ta dokument dopolnjuje standard ISO 12135, ki obravnava vse vidike preskušanja lomne žilavosti glavne kovine in ga je treba uporabljati skupaj s tem dokumentom. Ta dokument opisuje metode za ugotavljanje točkovnih vrednosti lomne žilavosti. Ne sme se ga upoštevati kot način pridobivanja veljavne krivulje R (krivulja odpornosti na raztezanje razpoke). Vendar bi lahko metode za pripravo preskušancev, opisane v tem dokumentu, uporabili pri ugotavljanju krivulj R za zvarne spoje. Pri metodah se uporabljajo utrujeni napokani preskušanci, ki so po varjenju bili zarezani na določenem ciljnem mestu zvarnega spoja. Opisane so metode za oceno primernosti izvedbe zareze na ciljnem mestu zvarnega spoja, ki je na zvarni kovini ali območju, na katerega vpliva toplota (HAZ), in nato oceno učinkovitosti utrujene razpoke pri vzorčenju teh območij, kjer je to ustrezno.

General Information

Status
Published
Publication Date
30-Jan-2018
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
31-Jan-2018
Completion Date
31-Jan-2018

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SLOVENSKI STANDARD
SIST EN ISO 15653:2018
01-oktober-2018
1DGRPHãþD
SIST EN ISO 15653:2011
.RYLQVNLPDWHULDOL3UHVNXVQDPHWRGD]DXJRWDYOMDQMHNYD]LVWDWLþQHORPQH
åLODYRVWL]YDUQLKVSRMHY ,62

Metallic materials - Method of test for the determination of quasistatic fracture toughness

of welds (ISO 15653:2018)
Metallische Werkstoffe - Prüfverfahren zur Bestimmung der quasistatischen
Bruchzähigkeit von Schweißnähten (ISO 15653:2018)

Matériaux métalliques - Méthode d'essai pour la détermination de la ténacité quasi

statique à la rupture des soudures (ISO 15653:2018)
Ta slovenski standard je istoveten z: EN ISO 15653:2018
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
SIST EN ISO 15653:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 15653:2018
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SIST EN ISO 15653:2018
EN ISO 15653
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2018
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN ISO 15653:2010
English Version
Metallic materials - Method of test for the determination of
quasistatic fracture toughness of welds (ISO 15653:2018)

Matériaux métalliques - Méthode d'essai pour la Metallische Werkstoffe - Prüfverfahren zur

détermination de la ténacité quasi statique à la rupture Bestimmung der quasistatischen Bruchzähigkeit von

des soudures (ISO 15653:2018) Schweißverbindungen (ISO 15653:2018)
This European Standard was approved by CEN on 10 November 2017.

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-CENELEC 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-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15653:2018 E

worldwide for CEN national Members.
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SIST EN ISO 15653:2018
EN ISO 15653:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 15653:2018
EN ISO 15653:2018 (E)
European foreword

This document (EN ISO 15653:2018) has been prepared by Technical Committee ISO/TC 164

"Mechanical testing of metals" in collaboration with Technical Committee CEN/TC 121 “Welding and

allied processes” the secretariat of which is held by DIN.

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 July 2018, and conflicting national standards shall be

withdrawn at the latest by July 2018.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 15653:2010.

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,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 15653:2018 has been approved by CEN as EN ISO 15653:2018 without any modification.

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SIST EN ISO 15653:2018
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SIST EN ISO 15653:2018
INTERNATIONAL ISO
STANDARD 15653
Second edition
2018-01
Metallic materials — Method of test
for the determination of quasistatic
fracture toughness of welds
Matériaux métalliques — Méthode d'essai pour la détermination de la
ténacité quasi statique à la rupture des soudures
Reference number
ISO 15653:2018(E)
ISO 2018
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SIST EN ISO 15653:2018
ISO 15653:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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SIST EN ISO 15653:2018
ISO 15653:2018(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and units ............................................................................................................................................................................................... 3

5 Principle ........................................................................................................................................................................................................................ 3

6 Choice of specimen design, specimen orientation and notch location ........................................................4

6.1 Classification of target area for notching ......................................................................................................................... 4

6.2 Specimen design .................................................................................................................................................................................... 4

6.3 Specimen and crack plane orientation ............................................................................................................................... 4

7 Pre-machining metallography................................................................................................................................................................ 8

7.1 Microstructural assessment of macrosections ............................................................................................................ 8

7.2 Additional requirements for heat-affected zone tests .......................................................................................... 9

8 Machining..................................................................................................................................................................................................................... 9

8.1 Tolerances on specimen dimensions ................................................................................................................................... 9

8.2 Notch placement for through-thickness notched specimens ......................................................................10

8.3 Notch placement for surface-notched specimens..................................................................................................10

8.4 Notch machining .................................................................................................................................................................................11

9 Specimen preparation .................................................................................................................................................................................16

9.1 Fatigue precracking .........................................................................................................................................................................16

9.2 Side grooving .........................................................................................................................................................................................16

10 Test apparatus, requirements and test procedure ........................................................................................................16

11 Post-test metallography .............................................................................................................................................................................16

11.1 General ........................................................................................................................................................................................................16

11.2 Through-thickness notched specimens ..........................................................................................................................17

11.2.1 Sectioning ............................................................................................................................................................................17

11.2.2 Assessment ........................................................................................................................................................................17

11.3 Surface-notched specimens ......................................................................................................................................................17

11.3.1 Sectioning ............................................................................................................................................................................17

11.3.2 Assessment ........................................................................................................................................................................17

11.4 Assessment of pop-in .....................................................................................................................................................................17

12 Post-test analysis ...............................................................................................................................................................................................20

12.1 Choice of tensile properties ......................................................................................................................................................20

12.2 Determination of fracture toughness ...............................................................................................................................21

12.2.1 K ................................................................................................................................................................................................

Ic 21

12.2.2 δ ................................................................................................................................................................................................... 21

12.2.3 J .................................................................................................................................................................................................... 22

12.2.4 Shallow-notched bend specimen ....................................................................................................................22

12.3 Qualification requirements .......................................................................................................................................................23

12.3.1 General...................................................................................................................................................................................23

12.3.2 Weld-width-to-crack-ligament ratio ............................................................................................................23

12.3.3 Crack front straightness .........................................................................................................................................23

12.3.4 Symbols used to identify fracture toughness values ......................................................................25

12.3.5 Through-thickness notched specimens ....................................................................................................25

12.3.6 Surface-notched specimens .................................................................................................................................25

13 Test report ................................................................................................................................................................................................................26

Annex A (informative) Examples of notch locations .........................................................................................................................27

Annex B (informative) Examples of pre-test and post-test metallography ...............................................................29

© ISO 2018 – All rights reserved iii
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SIST EN ISO 15653:2018
ISO 15653:2018(E)

Annex C (informative) Residual-stress modification and precracking technique .............................................31

Annex D (normative) Assessment of pop-in ..............................................................................................................................................35

Annex E (informative) Shallow-notched bend specimen testing..........................................................................................42

Bibliography .............................................................................................................................................................................................................................45

iv © ISO 2018 – All rights reserved
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SIST EN ISO 15653:2018
ISO 15653:2018(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.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals,

Subcommittee SC 4, Toughness testing — Fracture (F), Pendulum (P), Tear (T).

This second edition of ISO 15653 cancels and replaces the first edition (ISO 15653:2010), which has

been technically revised.
The main changes compared to the previous edition are as follows:

— new formulae for the calculation of single-point determination of CTOD (12.2.2) have been added;

— introduction for reverse bending in C.3 has been added;
— assessment of pop-in in D.1 has been clarified;

— new formula for the calculation for single-point determination of CTOD in shallow notched specimens

in E.4 has been added.
© ISO 2018 – All rights reserved v
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SIST EN ISO 15653:2018
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SIST EN ISO 15653:2018
INTERNATIONAL STANDARD ISO 15653:2018(E)
Metallic materials — Method of test for the determination
of quasistatic fracture toughness of welds
1 Scope

This document specifies methods for determining fracture toughness in terms of stress intensity factor

(K), crack tip opening displacement or CTOD (δ) and experimental equivalent of the J-integral for welds

in metallic materials (J).

This document complements ISO 12135, which covers all aspects of fracture toughness testing of parent

metal and which needs to be used in conjunction with this document. This document describes methods

for determining point values of fracture toughness. It should not be considered a way of obtaining a valid

R-curve (resistance-to-crack-extension curve). However, the specimen preparation methods described

in this document could be usefully employed when determining R-curves for welds. The methods use

fatigue precracked specimens which have been notched, after welding, in a specific target area in the

weld. Methods are described to evaluate the suitability of a weld for notch placement within the target

area, which is either within the weld metal or within the weld heat-affected zone (HAZ), and then, where

appropriate, to evaluate the effectiveness of the fatigue crack in sampling these areas.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 12135:2016, Metallic materials — Unified method of test for the determination of quasistatic fracture

toughness
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12135 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
stretch zone width
SZW

increase in crack length associated with crack tip blunting, i.e. prior to the onset of unstable crack

extension, pop-in ( 3.3) or slow stable crack extension, and occurring in the same plane as the fatigue

precrack
3.2
target area
intended fatigue crack tip position within the weld metal (3.7) or HAZ (3.9)
3.3
pop-in

abrupt discontinuity in the force versus displacement record, featured as a sudden increase in

displacement and, generally, a sudden decrease in force, subsequent to which displacement and force

increase to above their values at the initiation of the discontinuity
© ISO 2018 – All rights reserved 1
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SIST EN ISO 15653:2018
ISO 15653:2018(E)
3.4
local compression

controlled compression applied to specimens in the thickness direction on the unnotched ligament

prior to fatigue cracking using hardened steel platens
Note 1 to entry: See Annex C.
3.5
welding

operation in which two or more parts are united by means of heat, friction, pressure or all three of

these, in such a way that there is continuity in the nature of the metal between these parts

Note 1 to entry: Filler metal, the melting temperature of which is of the same order as that of the parent metal,

may or may not be used.
3.6
weld
union of pieces of metal made by welding (3.5)
3.7
weld metal
all metal melted during the making of a weld (3.6) and retained in the weld
3.8
parent metal
metal to be joined by welding (3.5)
3.9
heat-affected zone
HAZ

zone in the parent metal that is metallurgically affected by the heat of welding (3.5)

3.10
fusion line

junction between the weld metal (3.7) and the parent metal (3.8) heat-affected zone

3.11
weld positional

target position for the fatigue crack tip, defined with respect to a reference line

Note 1 to entry: See Figure A.1 for examples.
3.12
specific microstructure
target microstructure for the fatigue crack tip
Note 1 to entry: See Figure A.2 for examples.
3.13
specimen blank

specimen prepared from weld metal (3.7) plus parent metal (3.8) prior to notching

3.14
post-weld heat treatment

heat treatment applied after welding (3.5) for the purpose of reducing residual stresses or modifying

weld (3.6) properties
2 © ISO 2018 – All rights reserved
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SIST EN ISO 15653:2018
ISO 15653:2018(E)
4 Symbols and units

For the purposes of this document, the symbols and units given in Table 1 apply in addition to those in

ISO 12135.
Table 1 — Symbols and units
Symbol Unit Designation
d , d mm Lengths of microstructural features associated with pop-in.
1 2

h mm Effective weld width, defined as shortest distance between fatigue crack tip and

weld fusion line within the central 75 % of the thickness (see Figures 13 and 14).

HV10 Vickers hardness using 10 kg force.
N Normal to welding direction.
P Parallel to welding direction.
Q Weld thickness direction.

R MPa 0,2 % offset yield strength of parent metal at the temperature of the fracture test.

p0,2b

R MPa 0,2 % offset yield strength of weld metal at the temperature of the fracture test.

p0,2w
R MPa Tensile strength of parent metal at the temperature of the fracture test.
R MPa Tensile strength of weld metal at the temperature of the fracture test.
s mm Distance between crack tip and target area measured in the crack plane
(see Figure 12).
s mm Distance between crack tip and target area measured perpendicular to the
crack plane (see Figure 12).
V mm Crack mouth opening displacement at notch edge in bend specimen and that at
load line in compact specimen.
V mm Displacement measured by clip gauge mounted on knife edges.
V mm Displacement measured with the double clip gauge arrangement described
in E.3 and illustrated in Figure E.1.
V mm Displacement measured with the double clip gauge arrangement described
in E.3 and illustrated in Figure E.1.
X Direction parallel to primary grain flow of parent metal.
Y Direction transverse to primary grain flow and to thickness of parent metal.
Z Direction through thickness of parent metal.

Δa mm Maximum length of brittle crack extension (beyond SZW; see 3.1) associated with

pop
pop-in.

λ mm Length of specific microstructure measured in pre-test or post-test metallography

(see Figure B.2).
5 Principle

This document specifies procedures for the determination of fracture toughness on notched-plus-

fatigue-cracked specimens taken from welds. It pertains to situations where the fatigue crack tip is

a) located in relation to a weld feature of interest, referred to as “weld positional” (WP), and

b) specifically located within a microstructure of interest, referred to as “specific microstructure” (SM).

Metallographic examination of the weld is used to confirm that the target weld feature and/or

microstructure is indeed present at the crack tip and in sufficient quantity for testing.

Specimen geometry and notch orientation are chosen, and a fatigue crack then extended from the

specimen's notch tip into the target weld feature or microstructure by applying a controlled alternating

force to the specimen. The purpose of the test is to determine weld fracture toughness in the absence

of significant residual welding stresses. To achieve this and to produce a straight-fronted fatigue crack,

© ISO 2018 – All rights reserved 3
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SIST EN ISO 15653:2018
ISO 15653:2018(E)

modifications to the fatigue precracking procedure may be required. These modifications are usually

necessary when testing as-welded or partially stress-relieved welds.

The fracture toughness test is performed and evaluated in accordance with ISO 12135, but subject to

additional requirements of this test method regarding post-test analysis (see 12.2.1, 12.2.2 and 12.2.3)

and qualification (see 12.3).

Post-test metallography is often required to make certain that the crack tip was located in the target

weld feature and/or microstructure and to determine the significance of pop-ins.
The sequence of operations is summarized in Figure 1.
6 Choice of specimen design, specimen orientation and notch location
6.1 Classification of target area for notching

A specimen selected for weld positional (WP) testing is intended to test a defined weld region with

respect to a reference position (e.g. the weld metal centreline).

A specimen selected for specific microstructure (SM) testing is intended to sample a specific

microstructure along the whole or part of the crack front length within the central 75 % of the specimen

thickness.
NOTE Some examples of WP and SM notch locations are given in Annex A.

WP weld metal centreline notch locations sampling predominantly grain-refined regions may give

misleading (overly high) values of fracture toughness for misaligned two-pass and parallel multi-pass

welds. For these welds, it is recommended that the SM notch locations shown in Figures A.2 d) and e),

respectively, be used.
6.2 Specimen design

Specimen design shall be of compact or single-edge-notched bend configuration as defined in

ISO 12135 and may be plain-sided or side-grooved. Bend specimens notched into the plate thickness

(see Figures 2, 3 and 4, parent metal specimens XY and YX and weld metal specimens NP and PN) are

referred to as through-thickness notched specimens, while those notched into the planar surface of the

plate (see Figures 2, 3 and 4, parent metal specimens XZ and YZ and weld metal specimens NQ and PQ)

are referred to as surface-notched specimens.

NOTE Tolerances on weld specimen dimensions are less stringent than those for testing parent metal

(see 8.1).

Test specimens shall have the dimension B or W (see Figure 5) equal to the full thickness of the parent

metal adjacent to the weld to be tested (excluding weld overfill).

Testing of sub-sized (i.e. B or W < full thickness in directions Q for weld and Z for parent metal in

Figures 2, 3 and 4) and/or side-grooved specimens is permitted, but shall be properly identified as such

in the test report. Results from sub-sized and/or side-grooved specimens may differ from those from

full-thickness specimens owing to size effects and/or different microstructural regions being tested.

6.3 Specimen and crack plane orientation

Specimen and crack plane orientation relative to the weld and parent metal working directions shall be

defined using the identification system described in Figures 2, 3 and 4.
4 © ISO 2018 – All rights reserved
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SIST EN ISO 15653:2018
ISO 15653:2018(E)
Choose target area
Choose specimen size
and geometry
Choose notch
orientation
Speciic
microstructure, SM
Weld positional, WP
Pre-test
metallography
Yes Can SM be No
tested?
Prepare blank
Mark notch location
Notch
Modify
Yes
residual stesses
Choose Annex C
procedures
Fatigue pr
...

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