EN ISO 18278-3:2017

SLOVENSKI STANDARD
01-marec-2018
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Resistance welding - Weldability - Part 3: Evaluation procedures for weldability in spot
weld bonding (ISO 18278-3:2017)
Widerstandsschweißen - Schweißeignung - Teil 3: Verfahren zum Bewerten der Eignung
für das Widerstandspunktschweißkleben (ISO 18278-3:2017)
Soudage par résistance - Soudabilité - Partie 3: Méthodes d'évaluation de l'aptitude au
soudocollage par points (ISO 18278-3:2017)
Ta slovenski standard je istoveten z: EN ISO 18278-3:2017
ICS:
25.160.10 Varilni postopki in varjenje Welding processes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 18278-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 25.160.40
English Version
Resistance welding - Weldability - Part 3: Evaluation
procedures for weldability in spot weld bonding (ISO
18278-3:2017)
Soudage par résistance - Soudabilité - Partie 3: Widerstandsschweißen - Schweißeignung - Teil 3:
Méthodes d'évaluation de l'aptitude au soudocollage Verfahren zum Bewerten der Eignung für das
par points (ISO 18278-3:2017) Widerstandspunktschweißkleben (ISO 18278-3:2017)
This European Standard was approved by CEN on 4 June 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18278-3:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 18278-3:2017) 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 March 2018, and conflicting national standards shall
be withdrawn at the latest by March 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 18278-3:2017 has been approved by CEN as EN ISO 18278-3:2017 without any
modification.
INTERNATIONAL ISO
STANDARD 18278-3
First edition
2017-08
Resistance welding — Weldability —
Part 3:
Evaluation procedures for weldability
in spot weld bonding
Soudage par résistance — Soudabilité —
Partie 3: Méthodes d’évaluation de l’aptitude au soudocollage par
points
Reference number
ISO 18278-3:2017(E)
©
ISO 2017
ISO 18278-3:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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the requester.
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copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 18278-3:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Weld bonding equipment . 2
4.1 General . 2
4.2 Adhesive dispensing equipment . 2
4.3 Storage chamber . 2
4.4 Electrodes . 2
4.5 Welding current . 2
4.6 Mechanical settings . 2
4.7 Measurement of parameters . 2
4.7.1 Temperature . 2
4.7.2 Amount of adhesive applied . 2
4.7.3 Welding current and electrode force . 3
4.7.4 Electrode cooling water flow rate . 3
4.8 Measurement of results . 3
4.8.1 Weld diameter . 3
4.8.2 Detection of expulsion . 3
5 Assembly preparation . 3
6 Preliminary adjustments . 4
6.1 Electrode alignment . 4
6.2 Electrode conditioning . 4
7 Determination of the welding current range . 5
7.1 Test specimens . 5
7.2 Welding parameters . 5
7.3 Test procedure . 5
7.4 Current range criteria . 5
7.5 Three sheet and multiple stack-ups . 6
8 Estimation of electrode life . 6
8.1 Test specimens . 6
8.2 Welding parameters . 6
8.3 Procedure . 6
8.4 Test criteria, interpretation of results . 7
9 Test report . 7
9.1 General . 7
9.2 Welding current range . 8
9.3 Electrode life . 8
Annex A (informative) Electrode alignment . 9
Annex B (informative) Specimens with current shunt .11
Annex C (informative) Specific conditions for steel sheet customer qualification .13
Annex D (informative) Specimens for destructive testing .16
Annex E (informative) Example of a test report for welding current range .18
Annex F (informative) Example of a test report for electrode life test.19
Bibliography .20
ISO 18278-3:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .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.
A list of all parts in the ISO 18278 series can be found on the ISO website.
Requests for official interpretations of any aspect of this document should be directed to the Secretariat
of ISO/TC 44/SC 6 via your national standards body. A complete listing of these bodies can be found at
www .iso .org.
iv © ISO 2017 – All rights reserved

ISO 18278-3:2017(E)
Introduction
This document describes procedures for evaluating the weldability of weld bonding using the resistance
spot welding process by determining the welding current range and electrode life.
These procedures can be used to evaluate the following:
a) the effect of electrode material, shape, dimensions and electrode cooling;
b) the effect of material types and thicknesses and coatings being welded;
c) the effect of welding conditions;
d) the effect of welding equipment;
e) the effect of adhesive on welding.
INTERNATIONAL STANDARD ISO 18278-3:2017(E)
Resistance welding — Weldability —
Part 3:
Evaluation procedures for weldability in spot weld bonding
1 Scope
This document specifies procedures for the determination of the acceptable welding current range and
the electrode life for spot weld bonding using resistance spot welding with adhesive bonding.
This document is applicable for the evaluation of the weldability of prepared assemblies of uncoated
and coated metal sheets with individual thicknesses from 0,4 mm to 6,0 mm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 669, Resistance welding — Resistance welding equipment — Mechanical and electrical requirements
ISO 5182, Resistance welding — Materials for electrodes and ancillary equipment
ISO 5821, Resistance welding — Spot welding electrode caps
ISO 14373, Resistance welding — Procedure for spot welding of uncoated and coated low carbon steels
ISO 17677-1, Resistance welding — Vocabulary — Part 1: Spot, projection and seam welding
ISO 18278-1:2015, Resistance welding — Weldability — Part 1: General requirements for the evaluation of
weldability for resistance spot, seam and projection welding of metallic materials
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 669, ISO 14373, ISO 17677-1
and ISO 18278-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
spot weld bonding
resistance spot welding through an adhesive or sealant
3.2
substrate
material upon the surface of which an adhesive is spread for weld bonding
3.3
prepared assembly
set of components (substrates and adhesives) positioned prior to welding
ISO 18278-3:2017(E)
3.4
wearing sheet
sheet which is used to produce electrode wear through continuous spot welding
4 Weld bonding equipment
4.1 General
Methods to characterize resistance welding equipment can be found in ISO 669.
The mass and friction of the movable electrode assembly can be determined in accordance with
ISO 18278-1.
4.2 Adhesive dispensing equipment
The adhesive dispensing equipment shall be defined by agreement between the contracting parties.
4.3 Storage chamber
The storage chamber shall have a temperature regulation system that is sufficient to maintain the
properties of the adhesive or sealant, as required by the manufacturer of the adhesive or sealant.
4.4 Electrodes
The electrode materials shall be as defined in ISO 5182. Their geometry shall be defined according to
ISO 5821.
4.5 Welding current
The type of welding current used (alternating current or direct current) shall be specified before
testing and recorded. Constant current control settings shall be used.
When using AC resistance welding equipment, it shall be set so that welding current is not less than
30 % of R.M.S. value at full conduction angle.
4.6 Mechanical settings
The mechanical settings shall be chosen to limit the impact of the electrode meeting the sheet.
To limit the impact of the electrode an electrode approach speed of 0,15 m/s is recommended and/or
the peak force should be less than 150 % of the nominal electrode force.
The machine squeeze time should be of sufficient duration to overcome electrode bounce effects and
machine inertia so as to allow the electrode force to build up to the required value before the welding
current is initiated.
4.7 Measurement of parameters
4.7.1 Temperature
The ambient temperature shall be measured.
4.7.2 Amount of adhesive applied
Measurement of the amount of adhesive applied shall be carried out as defined by the contracting
parties.
2 © ISO 2017 – All rights reserved

ISO 18278-3:2017(E)
For example, measurements can be performed using a calliper gauge, scale magnifier or by relative
weighing.
4.7.3 Welding current and electrode force
Measurement of welding current and electrode force shall be in accordance with ISO 18278-1:2015, 5.3.
4.7.4 Electrode cooling water flow rate
Since water cooling significantly influences electrode life, the inlet water temperature should be
maintained at 20 °C and shall not exceed 30 °C. A separate water supply should be used for each
ele
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