Resistance welding - Vocabulary - Part 1: Spot, projection and seam welding (ISO 17677-1:2021)

MINOR REVISION

Widerstandsschweißen - Begriffe - Teil 1: Punkt-, Buckel- und Rollennahtschweißen (ISO 17677-1:2021)

Dieses Dokument definiert Begriffe für das Widerstandspunkt-, Buckel- und Rollennahtschweißen.
ANMERKUNG Zusätzlich zu den Begriffen in Englisch und Französisch, zwei der drei offiziellen ISO-Sprachen, enthält dieser Dokument die entsprechenden deutschen Begriffe; diese werden unter der Zuständigkeit der Mitgliedsorganisation für Deutschland (DIN) veröffentlicht. Es können jedoch nur die Begriffe in den offiziellen Sprachen als ISO-Begriffe und ISO-Definitionen angesehen werden.

Soudage par résistance - Vocabulaire - Partie 1: Soudage par points, par bossages et à la molette (ISO 17677-1:2021)

Uporovno varjenje - Slovar - 1. del: Točkovno, bradavično in kolutno varjenje (ISO 17677-1:2021)

General Information

Status
Published
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
10-Mar-2021
Completion Date
10-Mar-2021

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SLOVENSKI STANDARD
SIST EN ISO 17677-1:2021
01-maj-2021
Nadomešča:
SIST EN ISO 17677-1:2019

Uporovno varjenje - Slovar - 1. del: Točkovno, bradavično in kolutno varjenje (ISO

17677-1:2021)

Resistance welding - Vocabulary - Part 1: Spot, projection and seam welding (ISO 17677

-1:2021)

Widerstandsschweißen - Begriffe - Teil 1: Punkt-, Buckel- und Rollennahtschweißen (ISO

17677-1:2021)

Soudage par résistance - Vocabulaire - Partie 1: Soudage par points, par bossages et à

la molette (ISO 17677-1:2021)
Ta slovenski standard je istoveten z: EN ISO 17677-1:2021
ICS:
01.040.25 Izdelavna tehnika (Slovarji) Manufacturing engineering
(Vocabularies)
25.160.10 Varilni postopki in varjenje Welding processes
SIST EN ISO 17677-1:2021 en,fr,de

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

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SIST EN ISO 17677-1:2021
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SIST EN ISO 17677-1:2021
EN ISO 17677-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 01.040.25; 25.160.10 Supersedes EN ISO 17677-1:2019
English Version
Resistance welding - Vocabulary - Part 1: Spot, projection
and seam welding (ISO 17677-1:2021)

Soudage par résistance - Vocabulaire - Partie 1: Widerstandsschweißen - Begriffe - Teil 1: Punkt-,

Soudage par points, par bossages et à la molette (ISO Buckel- und Rollennahtschweißen (ISO 17677-1:2021)

17677-1:2021)
This European Standard was approved by CEN on 28 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 17677-1:2021 E

worldwide for CEN national Members.
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SIST EN ISO 17677-1:2021
EN ISO 17677-1:2021 (E)
Contents Page

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

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SIST EN ISO 17677-1:2021
EN ISO 17677-1:2021 (E)
European foreword

This document (EN ISO 17677-1:2021) has been prepared by Technical Committee ISO/TC 44 "Welding

and allied processes" 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 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.

This document supersedes EN ISO 17677-1:2019.

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 17677-1:2021 has been approved by CEN as EN ISO 17677-1:2021 without any

modification.
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SIST EN ISO 17677-1:2021
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SIST EN ISO 17677-1:2021
INTERNATIONAL ISO
STANDARD 17677-1
NORME
Third edition
Troisième édition
INTERNATIONALE
2021-02
Resistance welding — Vocabulary —
Part 1:
Spot, projection and seam welding
Soudage par résistance —
Vocabulaire —
Partie 1:
Soudage par points, par bossages et à
la molette
Widerstandsschweißen — Begriffe —
Teil 1:
Punkt-, Buckel- und
Rollennahtschweißen
Reference number
Numéro de référence
ISO 17677-1:2021(E/F)
ISO 2021
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E/F)
COPYRIGHT PROTECTED DOCUMENT
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2021

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.

Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en oeuvre, aucune partie de cette

publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,

y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut

être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

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Published in Switzerland
Publié en Suisse
ii © ISO 2021 – All rights reserved/Tous droits réservés
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

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

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

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

3.1 Welding and testing procedures .............................................................................................................................................. 1

3.2 Hardware and tools ............................................................................................................................................................................. 3

3.3 Welding process and parameters............................................................................................................................................ 4

3.4 Measurements and values ............................................................................................................................................................. 9

Bibliography .............................................................................................................................................................................................................................27

© ISO 2021 – All rights reserved iii
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(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 of 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 www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes,

Subcommittee SC 6, Resistance welding and allied mechanical joining, in collaboration with the European

Committee for Standardization (CEN) Technical Committee CEN/TC 121, Welding and allied processes,

in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 17677-1:2019), of which it constitutes a

minor revision. The main changes compared to the previous edition are as follows:

— the terms and definitions of ISO 14329 have been implemented;
— editorial changes have been made.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.

Official interpretations of ISO/TC 44 documents, where they exist, are available from this page: https://

committee .iso .org/ sites/ tc44/ home/ interpretation .html.
iv © ISO 2021 – All rights reserved
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SIST EN ISO 17677-1:2021
INTERNATIONAL STANDARD ISO 17677-1:2021(E)
Resistance welding — Vocabulary —
Part 1:
Spot, projection and seam welding
1 Scope

This document establishes a vocabulary of terms and definitions for resistance spot welding, projection

welding and seam welding.

NOTE In addition to terms used in English and French, two of the three official ISO languages, this document

gives the equivalent terms in German; these are published under the responsibility of the member body for

Germany (DIN). However, only the terms and definitions given in the official languages can be considered as ISO

terms and definitions.
2 Normative references
There are no normative references in this document.
3 Terms and definitions

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 Welding and testing procedures
3.1.1
chisel test

test in which a chisel is driven between the sheets near to adjacent welds until either fracture occurs or

until the metal near the weld yields or bends
3.1.2
cross tension test

tensile test of a resistance welded specimen to determine the mechanical properties and failure mode

of the weld
3.1.3
cross-wire welding
projection welding (3.1.11) of crossed wires or rods
3.1.4
direct welding

resistance welding secondary circuit variant in which welding current and electrode force (3.3.5) are

applied to the workpieces by directly opposed electrodes (3.2.1) and only one weld is made by one

welding operation
Note 1 to entry: See Figure 12 for typical arrangements.
© ISO 2021 – All rights reserved 1
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.1.5
indirect welding

resistance welding secondary circuit variant in which the welding current flows through the workpieces

in locations away from, as well as at, the welds
Note 1 to entry: See Figure 13 for typical arrangements.
3.1.6
multiple impulse welding
welding with more than one impulse

Note 1 to entry: See Figures 4 to 7 for related time and electrode force (3.3.5) diagrams.

3.1.7
multiple spot welding

spot welding in which two or more welds are made simultaneously in one welding operation

Note 1 to entry: Examples are parallel spot welding (3.1.8) and series spot welding (3.1.14).

3.1.8
parallel spot welding

resistance welding secondary circuit variant in which the secondary current is divided in parallel

electrical paths to make two or more welds simultaneously
Note 1 to entry: See Figure 11 a).
3.1.9
peel test

destructive test in which a resistance-welded lap joint is tested by applying a peel force which results in

stresses mainly in the thickness direction of the weld
3.1.10
pillow test

destructive test in which internal pressure is applied in order to test for leaks and the strength of a

seam weld
3.1.11
projection welding

resistance welding in which the resulting welds are localized at predetermined points by projections,

embossments or intersections, concentrating force and current by their geometry

Note 1 to entry: The projections are raised on, or formed from, one or more of the faying surfaces (3.3.16) and

collapse during welding.
3.1.12
resistance spot welding

resistance welding process producing a weld at the faying surfaces (3.3.16) between overlapping parts

by the heat obtained from resistance to the flow of welding current through the workpieces from the

electrodes (3.2.1) serving to concentrate the welding current and pressure at the weld area

3.1.13
seam welding

resistance welding in which force is applied continuously and current is applied continuously or

intermittently to produce a linear weld, the workpieces being between two electrode wheels (3.2.5) or

an electrode wheel and an electrode bar
2 © ISO 2021 – All rights reserved
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.1.14
series spot welding

resistance welding secondary circuit variant in which the secondary current is conducted through the

workpieces and electrodes (3.2.1) in a series electrical path to simultaneously form multiple resistance

spot, seam or projection welds
Note 1 to entry: See Figures 1 and 11 b).
3.1.15
roll spot welding

resistance welding process variant that produces intermittent spot welds using one or more rotating

circular electrodes

Note 1 to entry: The rotation of the electrodes (3.2.1) may or may not be stopped during the making of a weld.

3.1.16
shunt weld
first weld on a series of spot welds, which acts as a shunt
3.1.17
tensile shear test

test in which a lap-welded specimen is subjected to a tensile force with the aim of determining the

mechanical properties of the specimen
3.1.18
stitch welding
spot welding in which successive welds overlap
3.2 Hardware and tools
3.2.1
electrode
resistance welding electrode

component of the electrical circuit that supplies electrical power and applies electrode force (3.3.5) to

the workpiece

EXAMPLE Rotating wheel, rotating roll, bar, cylinder, plate, clamp, chuck, variations thereof.

3.2.1.1
angled electrode
bent electrode

electrode for spot or stitch welding (3.1.18) whose electrode working face (3.2.6) is not normal to the

mounting axis
3.2.1.2
contact electrode

resistance welding electrode (3.2.1) designed to conduct secondary current through a workpiece without

making a weld
3.2.1.3
offset electrode
eccentric electrode

electrode for spot or stitch welding (3.1.18) whose electrode working face (3.2.6) is not concentric with

the axis of the electrode adaptor (3.2.2)
3.2.2
electrode adaptor
shank
device used to attach an electrode (3.2.1) to an electrode holder (3.2.4)
© ISO 2021 – All rights reserved 3
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.2.3
electrode cap
replaceable electrode (3.2.1) tip used in resistance spot welding (3.1.12)
3.2.4
electrode holder
device holding a welding electrode (3.2.1)
3.2.5
electrode wheel
seam welding wheel
rotating resistance welding electrode (3.2.1) of ring or disc shape
3.2.6
electrode working face

end of a resistance welding electrode (3.2.1) in contact

with the workpiece
3.2.7
welding head

device comprising the force generation and guiding system, carrying an electrode holder (3.2.4), platen

or electrode wheel (3.2.5)
3.3 Welding process and parameters
3.3.1
chill time
quench time

period of time between the end of the weld current and the start of post-heat current during which no

current flows and the weld is cooled by the electrodes (3.2.1)
Note 1 to entry: See Figure 5.
3.3.2
cool time
pause time

time interval between successive heat times in multiple impulse welding (3.1.6) or seam welding (3.1.13)

Note 1 to entry: See Figures 4 and 7.
3.3.3
current delay time
time interval between reaching set force and initiation of current flow
Note 1 to entry: See Figure 3.
3.3.4
current-off time

period of time between the cessation of current in one welding cycle (3.3.43) and the beginning of

current in the next one
3.3.5
electrode force
force applied by the electrodes to the workpieces
Note 1 to entry: See welding force (3.3.44).
3.3.6
welding electrode force
electrode force applied during weld time (3.3.40)
4 © ISO 2021 – All rights reserved
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.3.7
forging electrode force
forge force
electrode force applied in the forge force time
3.3.8
dynamic electrode force
electrode force applied during the actual welding cycle (3.3.43)
3.3.9
static electrode force
electrode force with no current flowing and no movement in the welding machine
3.3.10
theoretical electrode force

force, neglecting friction and inertia, available at the electrodes of a resistance welding machine by

virtue of the initial force and the theoretical mechanical properties of the system

3.3.11
electrode force programme
predetermined sequence of changes of force during welding
3.3.12
electrode force and current programme

predetermined sequence of changes of force and current during the welding cycle (3.3.43)

3.3.13
electrode movement during welding

physical displacement of electrodes (3.2.1) due to thermal expansion, shrinkage and indentation

during welding
3.3.14
electrode skidding

lateral movement of the electrodes (3.2.1) relative to the surface of the workpieces during the

welding process
3.3.15
electrode stroke

physical movement of electrodes (3.2.1) in the electrode axis during the welding cycle (3.3.43)

3.3.16
faying surface

mating surface of a workpiece in contact with another workpiece to which it is to be joined

3.3.17
force application time

total time of the application of force by the electrodes (3.2.1) to the workpiece in a welding cycle (3.3.43)

Note 1 to entry: See Figures 3 to 7.
3.3.18
force fall time
time between the start of force decrease to zero force
Note 1 to entry: See Figures 3 to 7.
3.3.19
force maintenance time

time in the welding cycle (3.3.43) during which a force is maintained at a predetermined level, excluding

the force rise time (3.3.20) and force fall time (3.3.18)
Note 1 to entry: See Figures 3 to 7.
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.3.20
force rise time

time between the start of a force increase and the application of the predetermined force

Note 1 to entry: See Figures 3 to 7.
3.3.21
electrode force time
force time
time during which the force is built up and applied
Note 1 to entry: See Figures 3 to 7.
3.3.22
forge time

time of increased force applied during or after the passage of the

welding current
Note 1 to entry: See Figure 6.
3.3.23
head approach time

time of movement of the electrode (3.2.1) from the rest position to contact with the workpiece

Note 1 to entry: See Figures 3 to 7.
3.3.24
head return time
time of electrode return from contact with the workpiece to the rest position
3.3.25
heat-affected zone
HAZ

portion of non-melted parent metal whose microstructure has been affected by the heat of welding

Note 1 to entry: See Figure 2.

[SOURCE: ISO/TR 25901-1:2016, 2.1.2.2, modified — “by the heat of welding” has been added to the

definition and Note 1 to entry has been added.]
3.3.26
heat time

duration of any one impulse in multiple impulse welding (3.1.6) or resistance seam welding (3.1.13)

Note 1 to entry: See Figures 4 to 7.
3.3.27
hold time
duration of electrode force (3.3.5) after cessation of current flow
Note 1 to entry: See Figures 3 to 7.
3.3.28
off-time
force set off-time
time after hold time until next start of working cycle
Note 1 to entry: See actual force off-time (3.3.29).
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.3.29
actual force off-time
actual off-time

measured period of time between two successive welding cycles (3.3.43) when no electrode force (3.3.5)

is being applied to the workpiece
Note 1 to entry: See off-time (3.3.28).
Note 2 to entry: See Figures 3 to 7.
3.3.30
opposing forces

forces tending to separate the electrodes, such as from a mismatch of workpieces, spring back,

sealants, etc.
Note 1 to entry: See welding force (3.3.44).
3.3.31
post-heat time
temper time

time following the chill time (3.3.1) during which a current is passed through the weld for heat treatment

or improvement of weld microstructure
Note 1 to entry: See Figures 5 and 6.
3.3.32
preheat time
duration of preheating current flow applied before the welding current
Note 1 to entry: See Figures 5 and 6.
3.3.33
expulsion
splash
spatter
flash

metal particles expelled between the faying surfaces (3.3.16) of the components or between the

components and electrodes during resistance spot welding (3.1.12), projection welding (3.1.11) or seam

welding (3.1.13)
3.3.34
squeeze time

set time between the initiation of the welding cycle (3.3.43) and first application of current

Note 1 to entry: See actual squeeze time (3.3.35).
Note 2 to entry: See Figures 3 to 7.
3.3.35
actual squeeze time

actual time between the initiation of the welding cycle (3.3.43) and first application of current

Note 1 to entry: See squeeze time (3.3.34).

Note 2 to entry: The time and electrode force (3.3.5) diagrams of Figures 3 to 8 show squeeze time.

3.3.36
time base
time expressed in cycles of the power supply frequency or in milliseconds
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.3.37
upslope

controlled continuous increase of the current from a predetermined value or zero during a set time period

Note 1 to entry: See down slope (3.3.38).
3.3.38
down slope

controlled continuous decrease of the current until a predetermined value or zero is reached during a

set time period
Note 1 to entry: See upslope (3.3.37).
3.3.39
weld contact area

area in the faying surface (3.3.16) through which welding current passes from one component to another

during resistance welding
3.3.40
weld time
duration of continuous flow of welding current
Note 1 to entry: See Figures 3 to 7.
3.3.41
welding current programme
predetermined sequence of changes of current
3.3.42
welding cycle time

time required to complete a welding cycle (3.3.43), excluding the time for positioning the electrodes (3.2.1)

Note 1 to entry: See Figures 3 to 7.
3.3.43
welding cycle

sequence of operations carried out by the machine to make a weld and return the

electrodes (3.2.1) to their initial position
3.3.44
welding force

force acting on the faying surfaces (3.3.16), resulting from the electrode force (3.3.5) and any opposing

forces (3.3.30), e.g. spring back of the workpieces, and the geometry of the parts

3.3.45
welding force programme
predetermined sequence of changes of force
3.3.46
work clearance stroke

physical displacement of electrodes (3.2.1), which allows them to move from one welding position to

the next
Note 1 to entry: See Figure 8.
3.3.47
working cycle time

duration of a succession of operations carried out by a machine or gun for the making of a weld,

including the return to the initial position
Note 1 to entry: See Figures 3 to 7.
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.3.48
working stroke
minimum movement of the electrodes (3.2.1) during the welding cycle (3.3.43)
Note 1 to entry: See Figure 8.
3.3.49
maximum stroke
high lift stroke
retract stroke
maximum electrode (3.2.1) stroke
3.4 Measurements and values
3.4.1
corona bond area

area surrounding the nugget (3.4.11) at the faying surfaces (3.3.16) in which only solid phase bonding

has occurred
3.4.2
corona bond diameter
mean diameter of the corona bond area (3.4.1)
Note 1 to entry: See Figures 2 and 9.
3.4.3
current pass area

area through which current passes from an electrode (3.2.1) to the workpiece, smaller than the electrode

working face (3.2.6) and which varies during the welding operation
3.4.4
duty cycle

percentage of time during a specified period when a power source or its accessories can be operated at

rated output without overheating
()t
Note 1 to entry: X = ×100%
where t is the heat time, and t is the specific period.
on sp
3.4.5
electrode indentation

spot or seam weld depression formed on the surface of workpieces by electrodes (3.2.1)

3.4.6
electrode indentation depth
e , e
u l

maximum depth of the electrode indentation (3.4.5) measured in the direction of the electrode force (3.3.5)

Note 1 to entry: See Figure 2.
3.4.7
electrode indentation diameter
d , d
eu el
diameter of the electrode indentation (3.4.5)
Note 1 to entry: See Figure 2.
Note 2 to entry: If possible the mean value should be used.
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.4.8
electrode life

number of acceptable spot welds or length of weld seam that can be made with an electrode without

any redressing or replacement of the electrode
3.4.9
electrode service life
electrode production life

number of acceptable spot welds or length of weld seam that can be made with an electrode (3.2.1)

before the electrode is no longer useable
3.4.10
electrode misalignment
unintentional offset between the axes of the electrodes (3.2.1)
3.4.11
nugget
zone in spot, projection or seam weld where the metal has been melted
Note 1 to entry: See Figure 2.
3.4.12
nugget penetration
p p
l, u

maximum penetration of the nugget (3.4.11) into the upper or lower workpiece, measured perpendicular

to the faying surface(s) (3.3.16) of the workpieces
Note 1 to entry: See Figure 2.
3.4.13
nugget thickness

maximum thickness of the nugget (3.4.11) in two or more sheets

measured perpendicular to the faying surface(s) (3.3.16) of the workpieces
Note 1 to entry: For two sheets, p = p + p ; see Figure 2.
l u
3.4.14
nugget overlap

length of common area between two adjacent overlapping seam weld nuggets (3.4.11)

Note 1 to entry: See Figure 14.

Note 2 to entry: The area contains the portion of the preceding weld nugget remolten by the succeeding weld.

3.4.15
seam weld width

width of the weld metal in the plane of the faying surfaces (3.3.16) in a direction normal to the

longitudinal axis of the linear seam weld
3.4.16
seam weld nugget length
length of individual weld nugget (3.4.11) in the seam welding (3.1.13) direction
10 © ISO 2021 – All rights reserved
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SIST EN ISO 17677-1:2021
ISO 17677-1:2021(E)
3.4.17
sheet separation

gap between the faying surfaces (3.3.16) measured at a distance of 0,5 d from the edge of the nugget

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