SIST EN ISO 17657-2:2007

SLOVENSKI STANDARD
01-september-2007
Uporovno varjenje - Merjenje jakosti varilnega toka pri uporovnem varjenju - 2.
del: Ampermeter z merilno tuljavo (ISO 17657-2:2005)
Resistance welding - Welding current measurement for resistance welding - Part 2:
Welding current meter with current sensing coil (ISO 17657-2:2005)
Widerstandsschweißen - Schweißstrommessung für das Widerstandsschweißen - Teil 2:
Schweißstrommessgeräte mit Strommessspule (ISO 17657-2:2005)
Soudage par résistance - Mesurage des courants en soudage par résistance - Partie 2:
Amperemetre avec tore de mesure de courant (ISO 17657-2:2005)
Ta slovenski standard je istoveten z: EN ISO 17657-2:2007
ICS:
25.160.10 Varilni postopki in varjenje Welding processes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 17657-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2007
ICS 25.160.10
English Version
Resistance welding - Welding current measurement for
resistance welding - Part 2: Welding current meter with current
sensing coil (ISO 17657-2:2005)
Soudage par résistance - Mesurage des courants en Widerstandsschweißen - Schweißstrommessung für das
soudage par résistance - Partie 2: Ampèremètre avec tore Widerstandsschweißen - Teil 2: Schweißstrommessgeräte
de mesure de courant (ISO 17657-2:2005) mit Strommessspule (ISO 17657-2:2005)
This European Standard was approved by CEN on 19 May 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, 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
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17657-2:2007: E
worldwide for CEN national Members.

Foreword
The text of ISO 17657-2:2005 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
17657-2:2007 by Technical Committee CEN/TC 121 "Welding", 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 December 2007, and conflicting national standards shall be withdrawn
at the latest by December 2007.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 17657-2:2005 has been approved by CEN as a EN ISO 17657-2:2007 without any
modification.
INTERNATIONAL ISO
STANDARD 17657-2
First edition
2005-09-15
Resistance welding — Welding current
measurement for resistance welding —
Part 2:
Welding current meter with current
sensing coil
Soudage par résistance — Mesurage des courants en soudage par
résistance —
Partie 2: Ampèremètre avec tore de mesure de courant

Reference number
ISO 17657-2:2005(E)
©
ISO 2005
ISO 17657-2:2005(E)
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ii © ISO 2005 – All rights reserved

ISO 17657-2:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 Physical environment and operating conditions . 2
5 Classification of welding current meters with their current sensing coil, and designation
of product . 2
5.1 Classes of welding current meter with current sensing coil . 2
5.2 Designation of product. 3
6 Requirements for welding current meter with current sensing coil. 3
6.1 Welding current meter. 3
6.2 Current sensing coil. 3
6.3 Welding current meter with its current sensing coil.4
6.4 Integrator. 4
6.5 Data processing unit . 4
6.6 Display unit and output ports. 4
6.7 Minimum and maximum duration of welding current. 4
6.8 Maximum measuring current. 5
6.9 Minimum measuring current . 5
6.10 Phase-controlled current. 5
6.11 Minimum time for current measurement. 5
6.12 Fluctuation of supply voltage. 5
6.13 Mechanical strength of current sensing coil . 5
6.14 Setting position error of current sensing coil . 5
6.15 Influence of ambient temperature . 5
6.16 Test. 6
6.16.1 Type test. 6
6.16.2 Acceptance test. 6
7 Test procedures. 6
7.1 Maximum measuring current. 6
7.2 Minimum measuring current . 6
7.3 Phase-controlled current. 7
7.4 Minimum time for current measurement. 7
7.5 Fluctuation of supply voltage. 7
7.6 Thermal test. 8
8 Marking. 8
Annex A (normative) Definition of indicated measuring time and its indicated current value. 9
A.1 Indicated measuring time . 9
A.2 Welding current value for the indicated measuring time . 10
Annex B (informative) Set-up of a current sensing coil and construction of welding current
meters . 11

ISO 17657-2:2005(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 17657-2 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 6, Resistance welding.
ISO 17657 consists of the following parts, under the general title Resistance welding — Welding current
measurement for resistance welding:
 Part 1: Guidelines for measurement
 Part 2: Welding current meter with current sensing coil
 Part 3: Current sensing coil
 Part 4: Calibration system
 Part 5: Verification of welding current measuring system
iv © ISO 2005 – All rights reserved

ISO 17657-2:2005(E)
Introduction
Requests for official interpretations of any aspect of this part of ISO 17657 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 http://www.iso.org.
INTERNATIONAL STANDARD ISO 17657-2:2005(E)

Resistance welding — Welding current measurement for
resistance welding —
Part 2:
Welding current meter with current sensing coil
1 Scope
This part of ISO 17657 specifies a welding current meter with a current sensing coil to measure the weld time
and the r.m.s. value of the welding current during a certain interval using single-phase alternating current of
frequency of 50 Hz or 60 Hz, or direct current.
This part of ISO 17657 is applicable for a welding current measuring system, with a display or calibrated
output port, which may be connected to a welding controller.
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 669, Resistance welding — Resistance welding equipment — Mechanical and electrical requirements
ISO 17657-1:2005, Resistance welding — Welding current measurement for resistance welding — Part 1:
Guidelines for measurement
ISO 17657-3:2005, Resistance welding — Welding current measurement for resistance welding — Part 3:
Current sensing coil
ISO 17657-4:2005, Resistance welding — Welding current measurement for resistance welding — Part 4:
Calibration system
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 669 and the following apply.
3.1
minimum measuring time
minimum settable value of the measuring time
See Figure A.1.
3.2
maximum measuring time
maximum settable value of the measuring time, which will depend on the types of component making up the
welding current meter
See Figure A.1.
ISO 17657-2:2005(E)
3.3
indicated measuring time
duration of measuring time, from start time to finish time, while the welding current is flowing
NOTE Normally the start and finish times for measuring current flow are automatically set. If the start time is set at
zero or at a value greater than zero, and the finish time is set at a smaller value than the weld time, as shown in Figure A.1,
then the welding current is calculated for the measuring duration between the start time and the finish time.
3.4
automatic zero level correction
device that allows removal of the effect of zero drift of output when direct welding current measurement is
incorporated
3.5
drift
amount of shift in the zero position
3.6
measuring accuracy
scatter limit of indicated or output values permissible, which is indicated against the full scale value
4 Physical environment and operating conditions
Unless otherwise specified, the welding current meter shall be capable of operating under the following
conditions without any adverse effect on its accuracy:
 at an ambient air temperature between of +5 °C and +40 °C;
 in relative humidity up to 95 %;
 at altitudes up to 1 000 m above mean sea level;
 where gas, fine dust, oil mist, spatters, etc. are included in the air such as those caused by ordinary arc or
spot welding work.
When the operating conditions deviate from those specified above, an agreement shall be made between the
manufacturer and the purchaser.
5 Classification of welding current meters with their current sensing coil, and
designation of product
5.1 Classes of welding current meter with current sensing coil
Welding current meters with their current sensing coil are classified as
...