SIST EN ISO 22826:2021
(Main)Destructive tests on welds in metallic materials - Hardness testing of narrow joints welded by laser and electron beam (Vickers and Knoop hardness tests) (ISO 22826:2005)
Destructive tests on welds in metallic materials - Hardness testing of narrow joints welded by laser and electron beam (Vickers and Knoop hardness tests) (ISO 22826:2005)
ISO 22826:2005 specifies the requirements for hardness testing of transverse sections of narrow laser and electron beam welded joints in metallic materials. It covers Vickers and Knoop hardness tests in accordance with ISO 6507-1 and ISO 4545, respectively, with test forces of 0,098 N to just under 98 N (HV 0,01 to just under HV 10) for the Vickers hardness test and test forces up to and including 9,8 N (just under HK 1) for the Knoop hardness test.
It is applicable to welds made with or without filler wire. It may not be applicable to the testing of wider hybrid laser/arc welds.
Zerstörende Prüfung von Schweißungen an metallischen Werkstoffen - Härteprüfung an durch Laser- und Elektrostrahleschweißung hergestellten Schweißungen (Vickers und Knoop Härteprüfung) (ISO 22826:2005)
Essais destructifs des soudures sur matériaux métalliques - Essais de dureté sur joints étroits soudés par faisceau d'électrons et faisceau laser (Essais de dureté Vickers et Knoop) (ISO 22826:2005)
L'ISO 22826 spécifie les exigences relatives aux essais de dureté sur coupes transversales de soudures étroites de matériaux métalliques réalisées en soudage par faisceau laser et par faisceau d'électrons. Elle couvre les essais de dureté Vickers et Knoop conformément à l'ISO 6507-1 et à l'ISO 4545, respectivement, avec des forces d'essai de 0,098 N jusqu'à juste en dessous de 98 N (HV 0,01 à juste en dessous de HV 10) pour ce qui concerne la dureté Vickers et des forces d'essai inférieures ou égales à 9,8 N (en dessous de HK 1) pour l'essai Knoop.
L'ISO 22826 s'applique aux soudures réalisées avec ou sans fil d'apport. Elle peut ne pas être applicable pour les essais sur des soudures plus larges réalisées par soudage hybride laser/arc.
Porušitveno preskušanje zvarnih spojev na kovinskih materialih - Preskušanje trdote zvarnih spojev, zvarjenih z laserskim žarkom in elektronskim snopom (preskus trdote po Vickersu in Knoopu) (ISO 22826:2005)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 22826:2021
01-maj-2021
Porušitveno preskušanje zvarnih spojev na kovinskih materialih - Preskušanje
trdote zvarnih spojev, zvarjenih z laserskim žarkom in elektronskim snopom
(preskus trdote po Vickersu in Knoopu) (ISO 22826:2005)
Destructive tests on welds in metallic materials - Hardness testing of narrow joints
welded by laser and electron beam (Vickers and Knoop hardness tests) (ISO
22826:2005)
Zerstörende Prüfung von Schweißungen an metallischen Werkstoffen - Härteprüfung an
durch Laser- und Elektrostrahleschweißung hergestellten Schweißungen (Vickers und
Knoop Härteprüfung) (ISO 22826:2005)
Essais destructifs des soudures sur matériaux métalliques - Essais de dureté sur joints
étroits soudés par faisceau d'électrons et faisceau laser (Essais de dureté Vickers et
Knoop) (ISO 22826:2005)
Ta slovenski standard je istoveten z: EN ISO 22826:2021
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
SIST EN ISO 22826:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 22826:2021
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SIST EN ISO 22826:2021
EN ISO 22826
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 25.160.40
English Version
Destructive tests on welds in metallic materials - Hardness
testing of narrow joints welded by laser and electron beam
(Vickers and Knoop hardness tests) (ISO 22826:2005)
Essais destructifs des soudures sur matériaux Zerstörende Prüfung von Schweißungen an
métalliques - Essais de dureté sur joints étroits soudés metallischen Werkstoffen - Härteprüfung an durch
par faisceau d'électrons et faisceau laser (Essais de Laser- und Elektrostrahleschweißung hergestellten
dureté Vickers et Knoop) (ISO 22826:2005) Schweißungen (Vickers und Knoop Härteprüfung) (ISO
22826:2005)
This European Standard was approved by CEN on 15 February 2021.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22826:2021 E
worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 22826:2021
EN ISO 22826:2021 (E)
Contents Page
European foreword . 3
2
---------------------- Page: 4 ----------------------
SIST EN ISO 22826:2021
EN ISO 22826:2021 (E)
European foreword
The text of ISO 22826:2005 has been prepared by Technical Committee ISO/TC 44 "Welding and allied
processes” of the International Organization for Standardization (ISO) and has been taken over as
EN ISO 22826:2021 by 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 September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
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.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 22826:2005 has been approved by CEN as EN ISO 22826:2021 without any modification.
3
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SIST EN ISO 22826:2021
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SIST EN ISO 22826:2021
INTERNATIONAL ISO
STANDARD 22826
First edition
2005-09-01
Destructive tests on welds in metallic
materials — Hardness testing of narrow
joints welded by laser and electron beam
(Vickers and Knoop hardness tests)
Essais destructifs des soudures sur matériaux métalliques — Essais de
dureté sur joints étroits soudés par faisceau d'électrons et faisceau
laser (Essais de dureté Vickers et Knoop)
Reference number
ISO 22826:2005(E)
©
ISO 2005
---------------------- Page: 7 ----------------------
SIST EN ISO 22826:2021
ISO 22826:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2005
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
ISO's member 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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2005 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 22826:2021
ISO 22826:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 General. 2
4 Symbols and abbreviated terms . 2
5 Preparation of test specimens . 3
6 Test procedure . 3
6.1 General. 3
6.2 Type of test. 3
6.3 Test location requirements. 4
6.4 Individual indentation (type E test). 6
6.5 Rows of indentations (type R test). 8
7 Test results. 11
8 Test report . 11
Annex A (informative) Selection of test force . 12
Annex B (informative) Example of a test report format for type E hardness test. 14
Annex C (informative) Example of a test report format for type R hardness test . 15
Bibliography . 16
© ISO 2005 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 22826:2021
ISO 22826:2005(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 22826 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 5, Testing and inspection of welds.
iv © ISO 2005 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 22826:2021
ISO 22826:2005(E)
Introduction
Requests for official interpretation of any aspect of this International Standard should be directed to the
Secretariat of ISO/TC 44/SC 5 via your national standards body. A complete listing of these bodies can be
found at www.iso.org
© ISO 2005 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 22826:2021
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SIST EN ISO 22826:2021
INTERNATIONAL STANDARD ISO 22826:2005(E)
Destructive tests on welds in metallic materials — Hardness
testing of narrow joints welded by laser and electron beam
(Vickers and Knoop hardness tests)
1 Scope
This International Standard specifies the requirements for hardness testing of transverse sections of narrow
laser and electron beam welded joints in metallic materials. It covers Vickers and Knoop hardness tests in
accordance with ISO 6507-1 and ISO 4545, respectively, with test forces of 0,098 N to just under 98 N
(HV 0,01 to just under HV 10) for the Vickers hardness test and test forces up to and including 9,8 N (just
under HK 1) for the Knoop hardness test.
This International Standard is applicable to welds made with or without filler wire. It may not be applicable to
the testing of wider hybrid laser/arc welds.
International Standards for hardness testing of welds without a narrow profile are ISO 9015-1 and ISO 9015-2.
2 Normative references
The following referenced documents are indispensable for the application 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 4545, Metallic materials — Hardness test — Knoop test
ISO 4546, Metallic materials — Hardness test — Verification of Knoop hardness testing machines
ISO 4547, Metallic materials — Hardness test — Calibration of standardized blocks to be used for Knoop
hardness testing machines
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
1)
ISO 6507-2:— , Metallic materials — Vickers hardness test — Part 2: Verification and calibration of testing
machines
2)
ISO 6507-3:— , Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks
ISO 10250, Metallic materials — Hardness testing — Tables of Knoop hardness values for use in tests made
on flat surfaces
ISO/TR 16060, Destructive tests on welds in metallic materials — Etchants for macroscopic and microscopic
examination
1) To be published. (Revision of ISO 6507-2:1997)
2) To be published. (Revision of ISO 6507-3:1997)
© ISO 2005 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 22826:2021
ISO 22826:2005(E)
3 General
Hardness testing shall be carried out in accordance with ISO 6507-1, ISO 6507-2 and ISO 6507-3 for the
Vickers hardness test, and ISO 4545, ISO 4546 and ISO 4547 for the Knoop hardness test.
Testing is carried out to determine the range of hardness values in the parent metal (both parent metals for
dissimilar-metal joints), the heat-affected zone and the weld metal. This can be achieved by carrying out
hardness tests as either individual indentations or groups of indentations (type E test) or as rows of
indentations (type R test).
Testing should preferably be carried out at a temperature of (23 ± 5) °C. If the test is carried out at a
temperature outside this range, it shall be noted in the test report.
Microhardness testing results are affected by vibrations, therefore testing shall be carried out in a vibration-
free location.
4 Symbols and abbreviated terms
For the purposes of this International Standard, the abbreviations given in Table 1 apply.
Table 1 — Symbols and abbreviated terms
Symbol Meaning Unit
HAZ Heat-affected zone —
E Individual indentation —
R Row of indentations —
a
HV Vickers hardness
b
HK Knoop hardness
L Distance between the centre points of the mm
indentations
M Recommended distance between the centre points of mm
the indentations in R
W Distance between the centre points of the mm
indentations in heat-affected zone and fusion line
d Diagonal length of the indentation in a Vickers mm
V
hardness test
d Long diagonal length of the indentation in a Knoop mm
KL
hardness test
d Short diagonal length of the indentation in a Knoop mm
KS
hardness test
h Weld penetration depth mm
t Thickness of test specimen mm
a
See ISO 6507-1.
b
See ISO 4545 and ISO 10250.
2 © ISO 2005 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 22826:2021
ISO 22826:2005(E)
5 Preparation of test specimens
Test specimens shall be prepared in accordance with ISO 6507-1 or ISO 4545.
A cross-section of the test piece shall be taken by mechanical cutting, usually transverse to the welded joint.
This operation and the subsequent preparation of the surface shall be carried out without heating to a
temperature high enough to cause softening or hardening of the surface.
The surface to be tested shall be properly prepared and preferably etched in accordance with ISO/TR 16060,
so that accurate measurements of the diagonal length of indentations can be obtained in the different zones of
the welded joint.
6 Test procedure
6.1 General
Figure 1 shows typical areas for the location of groups of indentations. Numbers 1 and 2 refer to the weld
metal, numbers 3 to 6 refer to the heat-affected zone (HAZ), and numbers 7 and 8 refer
...
SLOVENSKI STANDARD
oSIST prEN ISO 22826:2020
01-november-2020
Porušitveno preskušanje zvarnih spojev na kovinskih materialih - Preskušanje
trdote zvarnih spojev, zvarjenih z laserskim žarkom in elektronskim snopom
(preskus trdote po Vickersu in Knoopu) (ISO 22826:2005)
Destructive tests on welds in metallic materials - Hardness testing of narrow joints
welded by laser and electron beam (Vickers and Knoop hardness tests) (ISO
22826:2005)
Zerstörende Prüfung von Schweißungen an metallischen Werkstoffen - Härteprüfung an
durch Laser- und Elektronenstrahlen hergestellte Schweißungen (Vickers und Knoop
Härteprüfung) (ISO 22826:2005)
Essais destructifs des soudures sur matériaux métalliques - Essais de dureté sur joints
étroits soudés par faisceau d'électrons et faisceau laser (Essais de dureté Vickers et
Knoop) (ISO 22826:2005)
Ta slovenski standard je istoveten z: prEN ISO 22826
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
oSIST prEN ISO 22826:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 22826:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 22826:2020
INTERNATIONAL ISO
STANDARD 22826
First edition
2005-09-01
Destructive tests on welds in metallic
materials — Hardness testing of narrow
joints welded by laser and electron beam
(Vickers and Knoop hardness tests)
Essais destructifs des soudures sur matériaux métalliques — Essais de
dureté sur joints étroits soudés par faisceau d'électrons et faisceau
laser (Essais de dureté Vickers et Knoop)
Reference number
ISO 22826:2005(E)
©
ISO 2005
---------------------- Page: 3 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2005
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
ISO's member 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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2005 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 General. 2
4 Symbols and abbreviated terms . 2
5 Preparation of test specimens . 3
6 Test procedure . 3
6.1 General. 3
6.2 Type of test. 3
6.3 Test location requirements. 4
6.4 Individual indentation (type E test). 6
6.5 Rows of indentations (type R test). 8
7 Test results. 11
8 Test report . 11
Annex A (informative) Selection of test force . 12
Annex B (informative) Example of a test report format for type E hardness test. 14
Annex C (informative) Example of a test report format for type R hardness test . 15
Bibliography . 16
© ISO 2005 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(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 2.
The main task of technical committees is to prepare International Standards. 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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 22826 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 5, Testing and inspection of welds.
iv © ISO 2005 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
Introduction
Requests for official interpretation of any aspect of this International Standard should be directed to the
Secretariat of ISO/TC 44/SC 5 via your national standards body. A complete listing of these bodies can be
found at www.iso.org
© ISO 2005 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 22826:2020
---------------------- Page: 8 ----------------------
oSIST prEN ISO 22826:2020
INTERNATIONAL STANDARD ISO 22826:2005(E)
Destructive tests on welds in metallic materials — Hardness
testing of narrow joints welded by laser and electron beam
(Vickers and Knoop hardness tests)
1 Scope
This International Standard specifies the requirements for hardness testing of transverse sections of narrow
laser and electron beam welded joints in metallic materials. It covers Vickers and Knoop hardness tests in
accordance with ISO 6507-1 and ISO 4545, respectively, with test forces of 0,098 N to just under 98 N
(HV 0,01 to just under HV 10) for the Vickers hardness test and test forces up to and including 9,8 N (just
under HK 1) for the Knoop hardness test.
This International Standard is applicable to welds made with or without filler wire. It may not be applicable to
the testing of wider hybrid laser/arc welds.
International Standards for hardness testing of welds without a narrow profile are ISO 9015-1 and ISO 9015-2.
2 Normative references
The following referenced documents are indispensable for the application 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 4545, Metallic materials — Hardness test — Knoop test
ISO 4546, Metallic materials — Hardness test — Verification of Knoop hardness testing machines
ISO 4547, Metallic materials — Hardness test — Calibration of standardized blocks to be used for Knoop
hardness testing machines
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
1)
ISO 6507-2:— , Metallic materials — Vickers hardness test — Part 2: Verification and calibration of testing
machines
2)
ISO 6507-3:— , Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks
ISO 10250, Metallic materials — Hardness testing — Tables of Knoop hardness values for use in tests made
on flat surfaces
ISO/TR 16060, Destructive tests on welds in metallic materials — Etchants for macroscopic and microscopic
examination
1) To be published. (Revision of ISO 6507-2:1997)
2) To be published. (Revision of ISO 6507-3:1997)
© ISO 2005 – All rights reserved 1
---------------------- Page: 9 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
3 General
Hardness testing shall be carried out in accordance with ISO 6507-1, ISO 6507-2 and ISO 6507-3 for the
Vickers hardness test, and ISO 4545, ISO 4546 and ISO 4547 for the Knoop hardness test.
Testing is carried out to determine the range of hardness values in the parent metal (both parent metals for
dissimilar-metal joints), the heat-affected zone and the weld metal. This can be achieved by carrying out
hardness tests as either individual indentations or groups of indentations (type E test) or as rows of
indentations (type R test).
Testing should preferably be carried out at a temperature of (23 ± 5) °C. If the test is carried out at a
temperature outside this range, it shall be noted in the test report.
Microhardness testing results are affected by vibrations, therefore testing shall be carried out in a vibration-
free location.
4 Symbols and abbreviated terms
For the purposes of this International Standard, the abbreviations given in Table 1 apply.
Table 1 — Symbols and abbreviated terms
Symbol Meaning Unit
HAZ Heat-affected zone —
E Individual indentation —
R Row of indentations —
a
HV Vickers hardness
b
HK Knoop hardness
L Distance between the centre points of the mm
indentations
M Recommended distance between the centre points of mm
the indentations in R
W Distance between the centre points of the mm
indentations in heat-affected zone and fusion line
d Diagonal length of the indentation in a Vickers mm
V
hardness test
d Long diagonal length of the indentation in a Knoop mm
KL
hardness test
d Short diagonal length of the indentation in a Knoop mm
KS
hardness test
h Weld penetration depth mm
t Thickness of test specimen mm
a
See ISO 6507-1.
b
See ISO 4545 and ISO 10250.
2 © ISO 2005 – All rights reserved
---------------------- Page: 10 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
5 Preparation of test specimens
Test specimens shall be prepared in accordance with ISO 6507-1 or ISO 4545.
A cross-section of the test piece shall be taken by mechanical cutting, usually transverse to the welded joint.
This operation and the subsequent preparation of the surface shall be carried out without heating to a
temperature high enough to cause softening or hardening of the surface.
The surface to be tested shall be properly prepared and preferably etched in accordance with ISO/TR 16060,
so that accurate measurements of the diagonal length of indentations can be obtained in the different zones of
the welded joint.
6 Test procedure
6.1 General
Figure 1 shows typical areas for the location of groups of indentations. Numbers 1 and 2 refer to the weld
metal, numbers 3 to 6 refer to the heat-affected zone (HAZ), and numbers 7 and 8 refer to the parent metal.
Key
1, 2 weld metal
3, 4, 5, 6 heat-affected zone (HAZ)
7, 8 parent metal
a
Centre of the weld metal.
b
Fusion line.
Figure 1 — Location of group indentations for Vickers and Knoop hardness testing
When the type of welded joint is different from those shown in the examples, a test procedure appropriate to
the type of joint shall be carried out.
6.2 Type of test
Type E or type R tests shall be carried out with the indentations located in accordance with Figures 2 and 3 for
type E tests and Figures 4 and 5 for type R tests. The type of test shall be at the discretion of the test operator
unless otherwise specified. The type of test used shall be recorded.
© ISO 2005 – All rights reserved 3
---------------------- Page: 11 ----------------------
oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
6.3 Test location requirements
When the parent metal thickness, t, or the penetration depth, h, is 4 mm or less, the indentations in the weld
metal and HAZ shall be located in a line at the centre of the plate thickness, i.e. at t/2, or at the mid-point of
the penetration depth, i.e. at h/2, as shown in Figures 2a) and 2c).
When t or h is greater than 4 mm, the indentations shall be located in a line at a distance within 2 mm of the
top surface and back surface (or the bottom part of the penetration) as shown in Figures 2b) and 2d). In the
case of double fillet welds with full joint penetration, the indentation shall also be located at the centre part of
overlapped fusion zone as shown in Figure 2d).
Dimensions in millimetres
a) Location of indentations — Penetration depth h u 4 mm
b) Location of indentations — Penetration depth h > 4 mm
4 © ISO 2005 – All rights reserved
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oSIST prEN ISO 22826:2020
ISO 22826:2005(E)
c) Location of indentations — Penetration depth h or t u 4 mm
d) Location of indentations — Penetration depth h or t > 4 mm
Key
1, 2 weld metal
3, 4, 5, 6 heat-affected zone (HAZ)
7, 8 parent metal
a
Centre of the weld metal.
b
Fusion line.
F
...
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