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

Status
Published
Public Enquiry End Date
01-Dec-2020
Publication Date
22-Mar-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Mar-2021
Due Date
16-May-2021
Completion Date
23-Mar-2021

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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.
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SIST EN ISO 22826:2021
EN ISO 22826:2021 (E)
Contents Page

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

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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.

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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
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SIST EN ISO 22826:2021
ISO 22826:2005(E)
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© 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,

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ii © ISO 2005 – All rights reserved
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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
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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
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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
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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

ISO 6507-2:— , Metallic materials — Vickers hardness test — Part 2: Verification and calibration of testing

machines

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
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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 —
HV Vickers hardness
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
hardness test
d Long diagonal length of the indentation in a Knoop mm
hardness test
d Short diagonal length of the indentation in a Knoop mm
hardness test
h Weld penetration depth mm
t Thickness of test specimen mm
See ISO 6507-1.
See ISO 4545 and ISO 10250.
2 © ISO 2005 – All rights reserved
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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

...

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