SIST EN IEC 60974-14:2019

Arc welding equipment - Part 14: Calibration, validation and consistency testing (IEC 60974-14:2018)

IEC 60974-14:2018(E) specifies requirements for the verification of arc welding and external monitoring equipment. This document also serves for practical implementation of the verification procedure for arc welding equipment.
This document can be applied at the time of installation and any other times or intervals the user deems appropriate to ensure the equipment is capable of operating to the manufacturer’s specification or other specifications deemed applicable by the user.

Lichtbogenschweißeinrichtungen - Teil 14: Kalibrierung, Validierung und Konsistenzprüfung (IEC 60974-14:2018)

Matériel de soudage à l'arc - Partie 14: Étalonnage, validation et essais de consistance (IEC 60974-14:2018)

L'IEC 60974-14:2018 spécifie les exigences en matière de vérification du matériel de soudage à l'arc et du matériel de surveillance extérieur. Le présent document assure également la mise en œuvre pratique de la procédure de vérification du matériel de soudage à l’arc.
Il peut être appliqué au moment de l'installation et à d'autres moments ou intervalles que l'utilisateur juge pertinents pour permettre au matériel de fonctionner selon les spécifications du fabricant ou selon d'autres spécifications qu'il aura jugées applicables.
La présente version bilingue (2020-06) correspond à la version anglaise monolingue publiée en 2018-10.
La version française de cette norme n'a pas été soumise au vote.

Oprema za obločno varjenje - 14. del: Umerjanje, validacija in preskušanje skladnosti (IEC 60974-14:2018)

Ta del standarda IEC 60974 določa zahteve za VERIFIKACIJO opreme za obločno varjenje in zunanji nadzor. Ta dokument se uporablja tudi za praktično izvajanje postopka VERIFIKACIJE opreme za obločno varjenje.
Ta dokument je mogoče uporabiti v času namestitve in v vseh drugih časovnih presledkih ali intervalih, ki jih določi uporabnik, ki želi zagotoviti, da oprema obratuje v skladu s proizvajalčevimi specifikacijami ali drugimi uporabniško določenimi specifikacijami.
Ta dokument se ne uporablja za:
– plazemske sisteme, ki se uporabljajo za rezanje in dolbenje;
– naprave za obločne udare in stabilizacijo;
– opremo za obločno varjenje, izdelano v skladu s standardom IEC 60974-6.
OPOMBA 1: Druge komponente v varilnih sistemih, kot so npr. roboti, naprave za obračanje, plinske konzole itd., ravno tako vplivajo na rezultat varjenja in jih je mogoče po potrebi verificirati. Dodatne informacije so navedene v standardu ISO 17662.
OPOMBA 2: Redni pregledi in preskušanje opreme za obločno varjenje so zajeti v standardu IEC 60974-4.
Ta dokument velja za uporabnika, servisno delavnico ali proizvajalca. Dokument je mogoče uporabiti – samostojno;
– v povezavi z navodili proizvajalca; ali
– kot podlago za enakovreden postopek VERIFIKACIJE, ki ga je za določeno opremo pripravil proizvajalec.

General Information

• Status: Published
• Publication Date: 06-Dec-2018
• ICS: 25.160.30 - Welding equipment
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Dec-2018
• Due Date: 09-Feb-2019
• Completion Date: 07-Dec-2018
• Ref Project: EN IEC 60974-14:2018 - Arc welding equipment - Part 14: Calibration, validation and consistency testing

Relations

• Replaces: SIST EN 50504:2009 - Validation of arc welding equipment
• Effective Date: 04-Dec-2018
• Corrected By: SIST EN IEC 60974-14:2019/AC:2022 - Arc welding equipment - Part 14: Calibration, validation and consistency testing (IEC 60974-14:2018/COR1:2022)
• Effective Date: 08-Feb-2022
• Revised: SIST EN 50504:2009 - Validation of arc welding equipment
• Effective Date: 18-Oct-2016

Overview

EN IEC 60974-14:2018 - Arc welding equipment Part 14 - defines requirements and practical procedures for the calibration, validation and consistency testing (verification) of arc welding equipment and external monitoring devices. The standard applies at installation and at any subsequent intervals deemed appropriate by the user to confirm equipment operates to the manufacturer’s specifications or other applicable requirements. It is intended as a practical implementation guide within the IEC 60974 series for verification of welding power sources, wire feeders and associated monitoring equipment.

Key topics and technical requirements

• Scope and terminology: Aligns verification and validation terms with ISO/IEC guidance and places wire feeding equipment into the main part of the document.
• Verification methods: Flow charts and procedures for selecting appropriate verification approaches for different power-source types and output modes.
• Calibration of displayed values: Procedures for verifying the accuracy of instrument displays (readings shown to the operator).
• Validation and consistency testing of set values: Methods to confirm that set/target parameters (current, voltage, wire feed speed, pulse/synergic controls) are produced consistently by the equipment.
• Test equipment and setup: Requirements for reference instruments, test loads, filters (e.g., high-frequency measurement considerations), and typical test configurations.
• Measurement formation and averaging: Guidance on arithmetic mean, rectified values and RMS as used in measured-value processing.
• Special topics: Slope, pulse and synergic control verification, pulsed MIG and TIG-specific precautions.
• Personnel, safety and reporting: Qualifications for testing personnel, safety precautions during verification, frequency recommendations, marking and sample verification reports (annexes provide templates).

Practical applications

• Commissioning new welding systems to ensure they meet manufacturer or project specifications.
• Periodic verification as part of maintenance, quality control or calibration programs in manufacturing and fabrication shops.
• Supporting welding quality management systems and contract compliance (used alongside ISO 17662).
• Calibration and test laboratories performing traceable checks on welding power sources and wire feeders.
• Field service and R&D groups that validate equipment performance after repair, upgrade or reconfiguration.

Who should use this standard

• Welding engineers and supervisors
• Quality managers and inspectors in fabrication and manufacturing
• Calibration laboratories and technical service providers
• OEMs and equipment manufacturers for product verification guidance
• Health & safety teams responsible for electrical and welding equipment safety

Related standards

• IEC/EN 60974 series (general arc welding equipment standards; see IEC 60974-1 for power sources)
• ISO 17662 (welding quality management - referenced for quality processes)
• Supersedes EN 50504:2008 (now replaced by EN IEC 60974-14:2018)

Keywords: EN IEC 60974-14:2018, arc welding equipment, calibration, validation, consistency testing, verification, welding power sources, wire feeder, welding equipment calibration, IEC 60974.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2019
1DGRPHãþD
SIST EN 50504:2009
2SUHPD]DREORþQRYDUMHQMHGHO8PHUMDQMHYDOLGDFLMDLQSUHVNXãDQMH
VNODGQRVWL,(&
Arc welding equipment - Part 14: Calibration, validation and consistency testing (IEC
60974-14:2018)
Lichtbogenschweißeinrichtungen - Teil 14: Kalibrierung, Validierung und
Konsistenzprüfung (IEC 60974-14:2018)
Matériel de soudage à l'arc - Partie 14: Étalonnage, validation et essais de consistance
(IEC 60974-14:2018)
Ta slovenski standard je istoveten z: EN IEC 60974-14:2018
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60974-14

NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2018
ICS 25.160.30 Supersedes EN 50504:2008
English Version
Arc welding equipment - Part 14: Calibration, validation and
consistency testing
(IEC 60974-14:2018)
Matériel de soudage à l'arc - Partie 14: Étalonnage, Lichtbogenschweißeinrichtungen - Teil 14: Kalibrierung,
validation et essais de consistance Validierung und Konsistenzprüfung
(IEC 60974-14:2018) (IEC 60974-14:2018)
This European Standard was approved by CENELEC on 2018-11-23. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60974-14:2018 E

European foreword
The text of document 26/661/FDIS, future edition 1 of IEC 60974-14, prepared by IEC/TC 26 "Electric
welding" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-08-23
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-11-23
document have to be withdrawn
This document supersedes EN 50504:2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60974-14:2018 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60974-4 NOTE Harmonized as EN 60974-4
IEC 60974-5 NOTE Harmonized as EN 60974-5
IEC 60974-6 NOTE Harmonized as EN 60974-6
IEC 60974-9 NOTE Harmonized as EN IEC 60974-9
ISO 17662 NOTE Harmonized as EN ISO 17662

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60974-1 2017 Arc welding equipment - Part 1: Welding power EN IEC 60974-1 2018
sources
IEC 60974-14 ®
Edition 1.0 2018-10
INTERNATIONAL
STANDARD
Arc welding equipment –
Part 14: Calibration, validation and consistency testing

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.160.30 ISBN 978-2-8322-6165-1

– 2 – IEC 60974-14:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Safety precautions . 9
5 Testing personnel . 9
6 VERIFICATION accuracies – permitted deviations . 9
7 Arc welding power sources . 11
7.1 Selection related to CALIBRATION, VALIDATION or CONSISTENCY TESTING of
process-relevant parameters . 11
7.1.1 VERIFICATION method . 11
7.1.2 Special features for AC determination of welding power source output
mode for VERIFICATION . 12
7.2 Testing equipment and test setup . 14
7.2.1 Test setup . 14
7.2.2 Reference instruments . 14
7.2.3 Test load . 15
7.2.4 Conventional load test values . 15
7.3 CALIBRATION, VALIDATION and CONSISTENCY TESTING procedure . 16
7.3.1 General . 16
7.3.2 CALIBRATION of DISPLAYED VALUE reading . 16
7.3.3 VALIDATION of SET VALUES . 17
7.3.4 CONSISTENCY TEST of SET VALUES . 17
8 Wire feeder . 17
8.1 General . 17
8.2 Requirements for VERIFICATION . 18
8.3 Method . 18
9 Frequency of VERIFICATION . 18
10 Marking and VERIFICATION report . 19
10.1 Marking . 19
10.2 VERIFICATION report . 19
Annex A (informative) Diagrams of VERIFICATION accuracies . 20
A.1 CALIBRATION accuracies of DISPLAYED VALUES . 20
A.2 VALIDATION accuracies of SET VALUES . 20
Annex B (informative) Measured value formation . 22
B.1 General . 22
B.2 Averaging of measurement values . 22
B.2.1 Arithmetic mean. 22
B.2.2 Arithmetic rectified value . 22
B.2.3 Root mean square (effective value) . 23
Annex C (informative) Slope, pulse and synergic controls . 24
C.1 VERIFICATION accuracy . 24
C.2 Requirements for VERIFICATION . 24
C.3 Method . 25
C.4 Pulsed MIG and synergic controls . 25

IEC 60974-14:2018 © IEC 2018 – 3 –
Annex D (informative) Precautions to be taken with TIG welding equipment. 26
Annex E (informative) Samples of VERIFICATION reports. 27
E.1 Sample of CALIBRATION report . 27
E.2 Sample of VALIDATION report . 28
E.3 Sample of CONSISTENCY TEST report . 29
Bibliography . 30

Figure 1 – Determination of VERIFICATION method. 12
Figure 2 – Determination of VERIFICATION based on power source type . 13
Figure 3 – Test setup example . 14
Figure 4 – Example 10 kHz filter with reference voltmeter . 15
Figure A.1 – Diagrams of CALIBRATION accuracies . 20
Figure A.2 – Diagrams of VALIDATION accuracies . 21

Table 1 – CALIBRATION accuracies of DISPLAYED VALUES . 10
Table 2 – VALIDATION accuracies of SET VALUES . 10

– 4 – IEC 60974-14:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 14: CALIBRATION, VALIDATION and CONSISTENCY TESTING

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60974-14 has been prepared by IEC technical committee TC 26:
Electric welding.
The text of this International Standard is based on the following documents:
FDIS Report on voting
26/661/FDIS 26/666/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

IEC 60974-14:2018 © IEC 2018 – 5 –
In this standard, the following print types are used:
– terms used throughout this standard which have been defined in clause 3: SMALL ROMAN
CAPITALS.
A list of all parts of the IEC 60974 series can be found, under the general title Arc welding
equipment, on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

– 6 – IEC 60974-14:2018 © IEC 2018
INTRODUCTION
This document is the first international edition for CALIBRATION, VALIDATION and CONSISTENCY
TESTING of arc welding equipment. It is based on the European Standard EN 50504:2008 and
will replace it. A brief history helps to understand the origin and development of this
document.
In Great Britain, BS 7570:1992, Code of practice for the validation of arc welding equipment,
was published and it became the equivalent European pre-standard ENV 50184:1996
(withdrawn).
The revised second edition of BS 7570 was published in 2000 and was later replaced by the
equivalent EN 50504:2008.
For quality management in the field of welding, this document should be used in conjunction
with ISO 17662.
The significant changes in respect to EN 50504:2008 are the following:
– terms VERIFICATION and VALIDATION aligned to ISO/IEC Guide 99:2007;
– wire feed equipment moved from the annex to main part of the document;
– new preferred requirement for digital instrument CALIBRATION with fixed tolerance values;
– flow charts for determination of VERIFICATION methods and sample reports added;
– EN 50504:2008 Annex E Validation of ancillary components in a welding system and
Annex F Voltage drops in the welding circuit deleted.

IEC 60974-14:2018 © IEC 2018 – 7 –
ARC WELDING EQUIPMENT –
Part 14: CALIBRATION, VALIDATION and CONSISTENCY TESTING

1 Scope
This part of IEC 60974 specifies requirements for the VERIFICATION of arc welding and external
monitoring equipment. This document also serves for practical implementation of the
VERIFICATION procedure for arc welding equipment.
This document can be applied at the time of installation and any other times or intervals the
user deems appropriate to ensure the equipment is capable of operating to the manufacturer’s
specification or other specifications deemed applicable by the user.
This document is not applicable to
– plasma systems used for cutting and gouging;
– arc striking and stabilizing devices;
– arc welding equipment designed in accordance with IEC 60974-6.
NOTE 1 Other components in welding systems such as for example robots, turning devices, gas consoles, etc.
also have influence on the welding result and can be verified, if necessary. Additional information can be found in
ISO 17662.
NOTE 2 Periodic inspection and testing for arc welding equipment is covered in IEC 60974-4.
This document is applicable for the user, service shop or manufacturer. It can be used
– stand alone;
– in conjunction with manufacturer’s instructions; or
– as the basis for an equivalent VERIFICATION procedure written by the manufacturer for
specific equipment.
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.
IEC 60974-1:2017, Arc welding equipment – Part 1: Welding power sources
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 http://www.iso.org/obp

– 8 – IEC 60974-14:2018 © IEC 2018
3.1
displayed value
measured value by internal instrument and shown at the equipment
Note 1 to entry: In some cases, the same display can be used for both SET VALUES and measured values. In such
cases the DISPLAYED VALUE is usually visible during welding.
3.2
set value
value chosen and set by the operator or by an automatic system
[SOURCE: IEC 60050-811:2017, 811-11-34, modified – Reference to motor vehicle and
driver removed.]
3.3
reference value
measurement value obtained by the reference instrument and used as a basis for comparison
with values of the same kind
3.4
expert
competent person
skilled person
person who can judge the work assigned and recognize possible hazards on the basis of
professional training, knowledge, experience and knowledge of the relevant equipment
Note 1 to entry: Several years of practice in the relevant technical field can be taken into consideration in
assessment of professional training.
[SOURCE: IEC 60050-851:2008, 851-11-10]
3.5
verification
operations for the purpose of demonstrating that an item of welding equipment or a welding
system conforms to the operating parameters for that welding equipment or system
3.6
calibration
set of operations which establishes, by reference to standards, the relationship which exists,
under specified conditions, between a DISPLAYED VALUE and a REFERENCE VALUE
[SOURCE: IEC 60050-311:2001, 311-01-09, modified – Notes removed and terms
"DISPLAYED VALUE" and "REFERENCE VALUE" used.]
3.7
validation
operations for the purpose of demonstrating that a SET VALUE meets the REFERENCE VALUE
(within specified limits)
3.8
consistency test
test to determine the repeatability of the equipment output over a period of time
3.9
standard grade
equipment verified to meet the accuracy for indication and meters required by IEC 60974-1 or
IEC 60974-5
IEC 60974-14:2018 © IEC 2018 – 9 –
3.10
precision grade
equipment verified to a higher level of accuracy for indication and meters than required by
IEC 60974-1 or IEC 60974-5
4 Safety precautions
VERIFICATION requirements and procedures for power sources depend on the type of welding
power source, i.e. whether these are power sources with "drooping characteristic" or with "flat
characteristic".
NOTE Drooping characteristic is related to MMA/TIG welding (typically constant current) and flat characteristic is
related to MIG/MAG/FCAW welding (typically constant voltage).
The output of a power source with flat characteristic should not be short-circuited, because a
very high current can result. A load resistance shall be used.
Care should be taken that testing instruments are not damaged. See Annex D.
For tungsten inert gas (TIG) equipment, the arc striking and stabilizing device shall be
switched off or be deactivated by other means. See Annex D.
If verifying with an arc, follow all local and national safety regulation and safety precautions
specified by the manufacturer.
5 Testing personnel
Welding equipment shall be tested by an EXPERT with suitable qualifications, corresponding
experience and sufficient training in welding and measurement technology, with knowledge of
electrical hazards that may occur and the required protective measures.
6 VERIFICATION accuracies – permitted deviations
For welding equipment that measures and displays current, voltage and/or wire feed speed
(DISPLAYED VALUE), the CALIBRATION accuracies given in Table 1 shall be used for the tests.
Current and voltage CALIBRATION are performed according to 7.3.2. For wire feed speed,
instructions in 8.3 apply.
– 10 – IEC 60974-14:2018 © IEC 2018
Table 1 – CALIBRATION accuracies of DISPLAYED VALUES
Measurement Type of STANDARD PRECISION Reference
measuring GRADE GRADE
instrument
Analog ± 2,5 % ± 1 % from upper range value of instrument
Current
of highest rated value for welding current
Digital ± 2,5 % ± 1 %
according to rating plate
Analog ± 2,5 % ± 1 % from upper range value of instrument
± 1,5 V ± 0,6 V preferred method
Voltage
or or or
Digital
± 2,5 % ± 1 % of rated no-load voltage (U ) or according
to manufacturer's specifications
of maximum setting
± 2,5 %
below 25 % of maximum setting
Analog or
± 10 % of REFERENCE VALUE
Digital
between 25 % and 100 % of maximum
setting
Wire feed
speed
of maximum setting
± 2,5 %
below 40 % of maximum setting
Analog or
of REFERENCE VALUE
Digital
± 6,25 %
between 40 % and 100 % of maximum
setting
For welding equipment that uses SET VALUES for current, voltage and/or wire feed speed
classified in physical units (e.g. V, A) VALIDATION accuracies given in Table 2 shall be used for
the tests. Current and voltage VALIDATION are performed according to 7.3.3. For wire feed
speed instructions in 8.3 apply.
NOTE For example a manual metal arc (MMA) typically has only a current SET VALUE.
Table 2 – VALIDATION accuracies of SET VALUES
SET VALUE Grade Accuracy Reference VALIDATION range
± 2,5 % of highest SET VALUE below 25 % of highest SET VALUE
Standard
± 10 % of REFERENCE VALUE 25 % to 100 % of highest SET VALUE
Current
± 1 % of highest SET VALUE below 40 % of highest SET VALUE
Precision
± 2,5 % of REFERENCE VALUE 40 % to 100 % of highest SET VALUE
± 2,5 % of highest SET VALUE below 25 % of highest SET VALUE
Standard
± 10 % of REFERENCE VALUE 25 % to 100 % of highest SET VALUE
Voltage
± 2 % of highest SET VALUE below 40 % of highest SET VALUE
Precision
± 5 % of REFERENCE VALUE 40 % to 100 % of highest SET VALUE
± 2,5 % of highest setting below 25 % of highest setting
Standard
± 10 % of REFERENCE VALUE between 25 % and 100 % of highest
setting
Wire feed
speed
± 2,5 % of highest setting below 40 % of highest setting
Precision
± 6,25 % of REFERENCE VALUE between 40 % and 100 % of highest
setting
See Annex A for diagrams of VERIFICATION accuracies established in Table 1 and Table 2.

IEC 60974-14:2018 © IEC 2018 – 11 –
7 Arc welding power sources
7.1 Selection related to CALIBRATION, VALIDATION or CONSISTENCY TESTING of process-
relevant parameters
7.1.1 VERIFICATION method
Key parameters shall be verified. In general, these include current, voltage and wire feed
speed.
The current wave shape shall be considered (see C.1). VERIFICATION is preferred in DC mode.
Consult manufacturer for further specifications.
NOTE 1 Key parameters can be listed in a welding procedure specification (WPS).
Depending on the design of the welding equipment to be tested, either CALIBRATION,
VALIDATION or CONSISTENCY TESTING shall be carried out (see Figure 1).
The DISPLAYED VALUE and REFERENCE VALUE measurements shall be taken at the same time or
in a steady state output condition.
NOTE 2 The selection of voltage or current control mode helps to achieve steady state output conditions. Some
welding power sources have control functions that can influence the measurements. Consult relevant manual or
manufacturer.
– 12 – IEC 60974-14:2018 © IEC 2018
Consult with the user to determine the parameters (e.g.
WPS) to be verified and the required accuracy grade.
Test each required and available parameter.
These are in general: current, voltage and wire feed speed
yes
DISPLAYED
calibrate DISPLAYED VALUE
7.3.2 CALIBRATION
VALUE
(against REFERENCE VALUE)
available?
no
SET VALUE yes
validate SET VALUE
7.3.3 VALIDATION
in absolute
(against REFERENCE VALUE)
scaling?
no
yes
SET VALUE
check consistency of SET VALUE
7.3.4 CONSISTENCY
in arbitrary
TEST
(against REFERENCE VALUE)
units?
no
VERIFICATION not possible document all results
IEC
Figure 1 – Determination of VERIFICATION method
NOTE 3 Minimum requirements are shown. For equipment with a DISPLAYED VALUE, it is sufficient to perform
CALIBRATION since the measured value is the most important VERIFICATION method. The user can perform additional
VERIFICATION such as VALIDATION and CONSISTENCY TESTING.
7.1.2 Special features for AC determination of welding power source output mode for
VERIFICATION
For power sources capable of AC and DC output modes, it is sufficient to verify them in DC
mode (see Figure 2).
IEC 60974-14:2018 © IEC 2018 – 13 –
Determination of VERIFICATION
procedure
type of only AC
only DC
welding power welding power
welding power
source source
source
AC and DC welding power
source or polarity switching
devices
specify
Is a single DC
no
DC+ and DC-
polarity sufficient
for
for
VERIFICATION
VERIFICATION?
...