SIST EN ISO 18278-2:2005

Resistance welding - Weldability - Part 2: Alternative procedures for the assessment of sheet steels for spot welding (ISO 18278-2:2004)

This European Standard specifies a laboratory test procedure for the determination of the acceptable welding current range and the assessment of electrode life using a multi-spot test with specific conditions.
This standard is applicable for the assessment of the weldability of uncoated and coated sheet steels of thicknesses up to 3 mm.
The test procedure specified in this standard and the results obtained, apply only for the introduction of a new type or batch of material.
Procedures for determining the generic weldability lobe at a constant weld time or electrode force are given in prEN ISO 14327.
The electrode life at constant machine settings is given in EN ISO 8166.

Widerstandsschweißen - Schweißeignung - Teil 2: Alternative Verfahren für das Bewerten von Stahlblechen für das Widerstandspunktschweißen (ISO 18278-2:2004)

Diese Europäische Norm legt Laborprüfverfahren für das Bestimmen des geeigneten Schweißstrombereiches und für das Beurteilen der Standmenge der Elektroden beim Einsatz einer Mehrfachpunktprüfung unter bestimmten Bedingungen fest.
Diese Norm ist anwendbar für das Bewerten der Schweißeignung von unbeschichtete/beschichtete Stähle bis zu 3 mm Dicke.
Die in dieser Norm festgelegten Prüfverfahren und die erhaltenen Ergebnisse sind nur bei der Einführung einer neuen Werkstoffsorte oder eines neuen Loses anzuwenden.
Die Verfahren für das Bestimmen des grundsätzlichen Schweißbereichsdiagramms bei einer konstanten Schweißzeit oder Elektrodenkraft werden in prEN ISO 14327 vorgegeben.
Die Standmenge der Elektroden bei konstanten Maschineneinstellungen ist nach EN ISO 8166 zu bestimmen.

Soudage par résistance - Soudabilité - Partie 2 : Méthodes alternatives d'évaluation des tôles d'acier pour le soudage par points (ISO 18278-2:2004)

La présente Norme Européenne spécifie une méthode d'essai de laboratoire permettant la détermination de la plage de courant acceptable et l'évaluation de la durée de vie des électrodes en utilisant un essai multipoints réalisé dans des conditions spécifiques.
La présente norme est applicable a l'évaluation de la soudabilité des tôles en acier revetu et non revetu d'épaisseur d'une valeur pouvant atteindre 3 mm.
La méthode d'essai spécifiée dans la présente norme et les résultats obtenus s'appliquent seulement pour l'introduction d'un nouveau type de matériau ou pour un nouveau lot matiere.
Les procédures permettant la détermination du domaine de soudabilité générique a temps de soudage constant ou a force de soudage constante sont données dans le prEN ISO 14327.
La durée de vie des électrodes avec des réglages de machine constants est déterminée suivant l'EN ISO 8166.

Elektrouporovno varjenje – Varivost – 2. del: Alternativni postopki za ocenjevanje jeklenih pločevin za točkovno varjenje (ISO 18278-2:2004)

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-2004
• Withdrawal Date: 02-Mar-2016
• ICS: 25.160.10 - Welding processes
• Technical Committee: VAR - Welding
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 02-Mar-2016
• Due Date: 25-Mar-2016
• Completion Date: 03-Mar-2016
• Ref Project: EN ISO 18278-2:2004 - Resistance welding - Weldability - Part 2: Alternative procedures for the assessment of sheet steels for spot welding (ISO 18278-2:2004)

Relations

• Replaced By: SIST EN ISO 18278-2:2016 - Resistance welding - Weldability - Part 2: Evaluation procedures for weldability in spot welding (ISO 18278-2:2016)
• Effective Date: 01-Apr-2016

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 18278-2:2005
01-januar-2005
(OHNWURXSRURYQRYDUMHQMH±9DULYRVW±GHO$OWHUQDWLYQLSRVWRSNL]DRFHQMHYDQMH
MHNOHQLKSORþHYLQ]DWRþNRYQRYDUMHQMH,62
Resistance welding - Weldability - Part 2: Alternative procedures for the assessment of
sheet steels for spot welding (ISO 18278-2:2004)
Widerstandsschweißen - Schweißeignung - Teil 2: Alternative Verfahren für das
Bewerten von Stahlblechen für das Widerstandspunktschweißen (ISO 18278-2:2004)
Soudage par résistance - Soudabilité - Partie 2 : Méthodes alternatives d'évaluation des
tôles d'acier pour le soudage par points (ISO 18278-2:2004)
Ta slovenski standard je istoveten z: EN ISO 18278-2:2004
ICS:
25.160.10 Varilni postopki in varjenje Welding processes
SIST EN ISO 18278-2:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 18278-2:2005

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SIST EN ISO 18278-2:2005
EUROPEAN STANDARD
EN ISO 18278-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 25.160.10
English version
Resistance welding - Weldability - Part 2: Alternative procedures
for the assessment of sheet steels for spot welding (ISO 18278-
2:2004)
Soudage par résistance - Soudabilité - Partie 2 : Méthodes Widerstandsschweißen - Schweißeignung - Teil 2:
alternatives d'évaluation des tôles d'acier pour le soudage Alternative Verfahren für das Bewerten von Stahlblechen
par points (ISO 18278-2:2004) für das Widerstandspunktschweißen (ISO 18278-2:2004)
This European Standard was approved by CEN on 24 June 2004.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18278-2:2004: E
worldwide for CEN national Members.

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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
Contents
page
Foreword.4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 Purpose.7
5 Weld equipment .7
5.1 General.7
5.2 Electrodes.7
5.3 Welding current.8
5.4 Mechanical system .8
5.5 Parameter measurement.8
6 Range of qualification .9
7 Test specimen characteristics .9
7.1 Materials .9
7.2 Assemblies .9
8 Preliminary adjustments .9
8.1 Electrode position check under electrode force used for the test.9
8.2 Electrode conditioning.9
9 Determination of the acceptable welding current range .10
9.1 Test specimens.10
9.2 Welding parameters .10
9.3 Acceptance criteria.10
9.4 Procedure .11
10 Estimation of electrode lifetime N.11
10.1 Essentials of the test.11
10.2 Adjustment of machine settings .11
10.3 Procedure .11
10.4 Test criteria, interpretation of results.12
11 Specific conditions for steel sheet customer qualification.12
11.1 Purpose.12
11.2 Material .12
11.3 Assemblies .13
11.4 Welding parameters .13
11.5 Acceptance criteria.15
12 Test report .15
12.1 General.15
12.2 Available welding current range .15
12.3 Electrode lifetime.16
Annex A (normative)  Profile tolerances and control gauges for electrodes.17
Annex B (normative)  Electrode position check.19
Annex C (normative)  Determination of available welding current range.20
Annex D (informative)  Test specimens for mechanical characterisation.21
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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
Annex E (informative) Test sheet - Available welding current range.23
Annex F (informative) Test sheet - Lifetime of electrodes .24
Bibliography.25


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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
Foreword
This document (EN ISO 18278-2:2004) has been prepared by Technical Committee CEN/TC 121 “Welding”, the
secretariat of which is held by DIN, in collaboration with Technical Committee ISO/TC 44 “Welding and allied
processes”.
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 May 2005, and conflicting national standards shall be withdrawn at the latest by
May 2005.
This standard consists of the following parts:
 Part 1: Assessment of weldability for resistance spot, seam and projection welding of metallic materials;
 Part 2: Alternative procedures for the assessment of sheet steels for spot welding.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
Introduction
This document describes alternative procedures for assessing the weldability of sheet steels by determining the
welding range and electrode life for resistance spot welding.
It supplements generic standards for the assessment of the weldability lobe (EN ISO 14327) and electrode life at
constant machine settings (EN ISO 8166). These procedures can be used to evaluate the following:
a) the effect of electrode material, shape, dimensions and electrode cooling when welding a particular material;
b) the effect of material type and thickness being welded;
c) the effect of welding conditions;
d) the effect of welding equipment type.
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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
1 Scope
This document specifies a laboratory test procedure for the determination of the acceptable welding current range
and the assessment of electrode life using a multi-spot test with specific conditions.
This document is applicable for the assessment of the weldability of uncoated and coated sheet steels of
thicknesses up to 3 mm.
The test procedure specified in this document and the results obtained, apply only for the introduction of a new type
or batch of material.
Procedures for determining the generic weldability lobe at a constant weld time or electrode force are given in
EN ISO 14327.
The electrode life at constant machine settings is given in EN ISO 8166.
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.
EN 22768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications (ISO 2768-1:1989).
EN 22768-2, General tolerances — Part 2: Geometrical tolerances for features without individual tolerance
indications (ISO 2768-2:1989).
EN 25821, Resistance spot welding electrode caps (ISO 5821:1979).
EN ISO 5183-1, Resistance welding equipment — Electrode adaptors, male taper 1:10 — Part 1: Conical fixing,
taper 1:10 (ISO 5183-1:1998).
EN ISO 6520-2, Welding and allied processes — Classification of geometric imperfections in metallic materials —
Part 2: Welding with pressure (ISO 6520-2:2001).
EN ISO 8166, Resistance welding — Procedure for the evaluation of the life of spot welding electrodes using
constant machines settings (ISO 8166:2003).
EN ISO 14272, Specimen dimensions and procedure for cross tension testing resistance spot and embossed
projection welds (ISO 14272:2000).
EN ISO 14327, Resistance welding — Procedures for determining the weldability lobe for resistance spot,
projection and seam welding (ISO 14327:2004).
EN ISO 14329:2003, Resistance welding — Destructive tests of welds — Failure types and geometric
measurements for resistance spot, seam and projection welds (ISO 14329:2003).
EN ISO 18278-1:2004, Resistance welding — Weldability — Part 1: Assessment of weldability for resistance spot,
seam and projection welding of metallic materials (ISO 18278-1:2004).
ISO 669:2000, Resistance welding — Resistance welding equipment — Mechanical and electrical requirements.
ISO 5182, Welding — Materials for resistance welding electrodes and ancillary equipment.
ISO 10447, Welding — Peel and chisel testing of resistance spot, projection and seam welds.
ISO/DIS 14373, Resistance welding — Procedure for spot welding of uncoated and coated low carbon steels.
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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
ISO/DIS 17657-1, Resistance welding — Welding current measurement for resistance welding — Part 1: Guideline
for measurement.
ISO/DIS 17657-2, Resistance welding — Welding current measurement for resistance welding — Part 2: Welding
current meter with current sensing coil.
ISO/DIS 17657-3, Resistance welding — Welding current measurement for resistance welding — Part 3: Current
sensing coil.
ISO/DIS 17657-4, Resistance welding — Welding current measurement for resistance welding — Part 4:
Calibration system.
ISO/DIS 17657-5, Resistance welding — Welding current measurement for resistance welding — Part 5:
Verification of welding current measuring system.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 669:2000, EN ISO 14329:2003 and
EN ISO 18278-1:2004 and the following apply.
3.1
acceptable welding current range
range of R.M.S. values of welding current between lower and upper limits which allows an acceptable weld
diameter
3.2
R.M.S. value
R.M.S. value of an alternating voltage is the square root of the mean value of the square of the voltage values
during a complete cycle
4 Purpose
This procedure allows the determination of the lower and upper limits of the welding current under specific welding
configuration in order to assess the life of the electrode for a given welding current chosen within the acceptable
welding current range, without any redressing of the electrode tips.
NOTE If automatic redressing or current stepping procedures are used, it is necessary to use a modified test and
procedure.
5 Weld equipment
5.1 General
Welding equipment shall be capable of delivering the required welding conditions to carry out the tests as defined
below.
5.2 Electrodes
The electrodes shall be of type A 2/3 material as defined in ISO 5182 unless otherwise specified.
The electrode configuration for these tests shall conform to:
 cap electrodes to be used;
 EN 25821 - G 16 × 20 - (d = 16 mm - l = 20 mm) for sheets with a thickness < 1,3 mm;
1 1
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SIST EN ISO 18278-2:2005
EN ISO 18278-2:2004 (E)
 EN 25821 - G 20 × 22 - (d = 20 mm - l = 22 mm ) for sheets with a thickness ≥ 1,3 mm.
1 1
The geometry shall be checked prior to commencing the test to ensure that tolerances are within ± 0,1 mm of the
range permitted for grade F of EN 22768-1 or EN 22768-2.
A typical gauge for checking electrode geometry is described in Annex A.
The adapter used shall have a cooling bore complying with:
 EN ISO 5183-1 - B 16 x 71 - A 2/3, or
 EN ISO 5183-1 - B 16 x 88 - A 2/3.
5.3 Welding current
Unless otherwise specified, welding current should be single phase AC, its R.M.S. value shall be set and recorded.
The equipment shall be set so that R.M.S. welding current is not less than 70 % of R.M.S. value at full conduction
angle.
5.4 Mechanical system
The electrode force applied by the electrode head assembly shall be chosen to minimize the impact effect of the
electrode meeting the sheet. For example, an electrode approach rate of 0,15 m/s is recommended. The electrode
approach rate measurements shall conform to ISO 669:2000, Annex A.
5.5 Parameter measurement
5.5.1 Welding current
In order to ensure optimum reproducibility and allow comparison of the results obtained from the various tests
previously carried out, the welding current shall be measured with a current measuring system which is regularly
calibrated in accordance with procedures outlined in ISO/DIS 17657-1 to ISO/D
...