SIST EN ISO 17279-3:2021
(Main)Welding - Micro joining of second generation high temperature superconductors - Part 3: Test methods for joints (ISO 17279-3:2021)
Welding - Micro joining of second generation high temperature superconductors - Part 3: Test methods for joints (ISO 17279-3:2021)
This document specifies the requirements for the test methods for joint of micro-joining of 2G HTS to
fulfil the requirements of ISO 17279-1 and ISO 17279-2.
This document specifies test methods for determining the capability of joints for the production of the
specified quality. It defines specific test requirements, but does not assign those requirements to any
specific product group.
Schweißen - Mikrofügen von Hochtemperatursupraleitern der 2. Generation - Teil 3: Prüfverfahren von Fügeverbindungen (ISO 17279-3:2021)
Dieses Dokument legt die Anforderungen an die Prüfverfahren für Mikrofügeverbindungen von 2G HTS fest, um die Anforderungen nach ISO 17279 1 und ISO 17279 2 zu erfüllen.
Dieses Dokument legt Prüfverfahren zur Bestimmung des Leistungsvermögens von Fügeverbindungen für die Produktion der festgelegten Qualität fest. Es werden spezifische Prüfanforderungen festgelegt, jedoch ohne Zuordnung für eine bestimmte Produktgruppe.
Soudage - Micro-assemblage des supraconducteurs à haute température de deuxième génération - Partie 3: Méthode d'essai des assemblages (ISO 17279-3:2021)
Le présent document spécifie les exigences pour les méthodes d'essai du micro-assemblage de deuxième génération (2G HTS) pour remplir les exigences des ISO 17279-1 et ISO 17279-2.
Le présent document spécifie les méthodes d'essai pour déterminer la capacité des assemblages pour la production de la qualité indiquée. Elle définit des exigences d'essai spécifiques, mais n'attribue pas ces exigences à un groupe de produits spécifique.
Varjenje - Mikro spajanje visokotemperaturnih superprevodnikov druge generacije - 3. del: Preskusne metode za zvarne spoje (ISO 17279-3:2021)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 17279-3:2021
01-maj-2021
Varjenje - Mikro spajanje visokotemperaturnih superprevodnikov druge generacije
- 3. del: Preskusne metode za zvarne spoje (ISO 17279-3:2021)
Welding - Micro joining of second generation high temperature superconductors - Part 3:
Test methods for joints (ISO 17279-3:2021)
Schweißen - Mikrofügen von Hochtemperatursupraleitern der 2. Generation - Teil 3:
Prüfverfahren von Fügeverbindungen (ISO 17279-3:2021)
Soudage - Micro-assemblage des supraconducteurs à haute température de deuxième
génération - Partie 3: Méthode d'essai des assemblages (ISO 17279-3:2021)
Ta slovenski standard je istoveten z: EN ISO 17279-3:2021
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
SIST EN ISO 17279-3:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN ISO 17279-3:2021
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SIST EN ISO 17279-3:2021
EN ISO 17279-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 25.160.01
English Version
Welding - Micro joining of second generation high
temperature superconductors - Part 3: Test methods for
joints (ISO 17279-3:2021)
Soudage - Micro-assemblage des supraconducteurs à Schweißen - Mikrofügen von
haute température de deuxième génération - Partie 3: Hochtemperatursupraleitern der 2. Generation - Teil 3:
Méthode d'essai des assemblages (ISO 17279-3:2021) Prüfverfahren von Fügeverbindungen (ISO 17279-
3:2021)
This European Standard was approved by CEN on 4 March 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 17279-3:2021 E
worldwide for CEN national Members.
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SIST EN ISO 17279-3:2021
EN ISO 17279-3:2021 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 17279-3:2021
EN ISO 17279-3:2021 (E)
European foreword
This document (EN ISO 17279-3:2021) 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.
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 17279-3:2021 has been approved by CEN as EN ISO 17279-3:2021 without any
modification.
3
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SIST EN ISO 17279-3:2021
---------------------- Page: 6 ----------------------
SIST EN ISO 17279-3:2021
INTERNATIONAL ISO
STANDARD 17279-3
First edition
2021-02
Welding — Micro joining of second
generation high temperature
superconductors —
Part 3:
Test methods for joints
Soudage — Micro-assemblage des supraconducteurs à haute
température de deuxième génération —
Partie 3: Méthode d'essai des assemblages
Reference number
ISO 17279-3:2021(E)
©
ISO 2021
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SIST EN ISO 17279-3:2021
ISO 17279-3:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© 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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 17279-3:2021
ISO 17279-3:2021(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test methods for joint . 1
4.1 General . 1
4.2 Visual testing . 2
4.2.1 General. 2
4.2.2 Qualification of test personnel . 2
4.2.3 Test equipment . 2
4.2.4 Surface condition and preparation . 2
4.2.5 Testing . 2
4.2.6 Acceptance criteria . 2
4.2.7 Test report . 3
4.3 Four-point-probe testing . 3
4.3.1 General. 3
4.3.2 Qualification of test personnel . 3
4.3.3 Test equipment . 3
4.3.4 Surface condition and preparation . 3
4.3.5 Testing . 3
4.3.6 Acceptance criteria . 9
4.3.7 Test report . 9
4.4 Field-decay testing . 9
4.4.1 General. 9
4.4.2 Qualification of test personnel . 9
4.4.3 Test equipment . 9
4.4.4 Surface condition and preparation . 9
4.4.5 Testing . 9
4.4.6 Acceptance criteria .12
4.4.7 Test teport.12
4.5 In-field testing .12
4.5.1 General.12
4.5.2 Qualification of test personnel .12
4.5.3 Test equipment .12
4.5.4 Surface condition and preparation .12
4.5.5 Testing .12
4.5.6 Acceptance criteria .15
4.5.7 Test report .15
4.6 Tensile testing .15
4.6.1 General.15
4.6.2 Qualification of test personnel .15
4.6.3 Test equipment .15
4.6.4 Surface condition and preparation .15
4.6.5 Testing .15
4.6.6 Acceptance criteria .16
4.6.7 Test report .16
4.7 Bend testing .16
4.7.1 General.16
4.7.2 Qualification of test personnel .16
4.7.3 Test equipment .16
4.7.4 Surface condition and preparation .16
4.7.5 Testing .16
© ISO 2021 – All rights reserved iii
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SIST EN ISO 17279-3:2021
ISO 17279-3:2021(E)
4.7.6 Acceptance criteria .17
4.7.7 Test report .17
4.8 Critical magnetic field testing .17
4.8.1 General.17
4.8.2 Qualification of test personnel .17
4.8.3 Test equipment .17
4.8.4 Surface condition and preparation .17
4.8.5 Testing .18
4.8.6 Acceptance criteria .18
4.8.7 Test report .18
4.9 Critical current density distribution testing .18
4.9.1 General.18
4.9.2 Qualification of test personnel .18
4.9.3 Test equipment .19
4.9.4 Surface condition and preparation .19
4.9.5 Testing .19
4.9.6 Acceptance criteria .19
4.9.7 Test report .19
4.10 Microscopic and X-ray diffraction testing .19
4.10.1 General.19
4.10.2 Qualification of test personnel .19
4.10.3 Test equipment .19
4.10.4 Surface condition and preparation .19
4.10.5 Testing .20
4.10.6 Acceptance criteria .20
4.10.7 Reporting .20
Annex A (informative) Report of visual testing results .21
Annex B (informative) Report of four-point-probe testing results .23
Annex C (informative) Report of field-decay testing results .26
Annex D (informative) Report of in-field testing results .29
Annex E (informative) Report of tensile testing results .33
Annex F (informative) Report of bend testing results .36
Annex G (informative) Report of critical magnetic field testing results .39
Annex H (informative) Report of critical current density distribution testing results .41
Annex I (informative) Report of microscopic and X-ray diffraction testing results .43
Bibliography .45
iv © ISO 2021 – All rights reserved
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SIST EN ISO 17279-3:2021
ISO 17279-3:2021(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 10, Quality management in the field of welding, 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).
A list of all parts in the ISO 17279 series can be found on the ISO website.
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.
© ISO 2021 – All rights reserved v
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SIST EN ISO 17279-3:2021
ISO 17279-3:2021(E)
Introduction
The increasing use of second-generation high temperature superconductors (2G HTSs) and invention
of resistance-free joining on 2G HTSs have created the need for the ISO 17279 series in order to ensure
that joining is carried out in the most effective way and that appropriate control is exercised over all
aspects of the operation. ISO standards for micro-joining and joint evaluation procedure are accordingly
essential to get the best and uniform quality of 2G HTS joint.
Superconductor is a material that conducts electricity without resistance and has diamagnetism below
critical temperature (T ), critical magnetic field (B ) and critical current density (J ). Once set in motion,
c c c
electrical current flows forever in a closed loop of superconducting material under diamagnetism.
2G HTS constitutes of multi-layers and total thickness is around 60 μm to 90 μm and the superconducting
layer made from REBa Cu O is only 1 μm to 3 μm thick depending on manufacturer’s specifications.
2 3 7-x
Figure 1 shows schematic drawing of typical multiple layers, and the constituents and thicknesses of
each layer in the 2G HTS.
Dimensions in micro-meters
Key
1 Cu stabilizer t thickness of layer 1
1
2 Ag overlayer t thickness of layer 2
2
3 REBCO-superconducting layer t thickness of layer 3
3
4 buffer stack t thickness of layer 4
4
5 hastelloy®C-276 substrate t thickness of layer 5
5
NOTE Not to scale.
Figure 1 — Typical 2G HTS multi-layers, and the constituents and thicknesses of each layer
vi © ISO 2021 – All rights reserved
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SIST EN ISO 17279-3:2021
ISO 17279-3:2021(E)
Currently soldering, brazing or any filler is applying in superconducting industry as shown in Figure 2,
which shows high electrical resistance at the joint providing fatal flaw in the superconductor.
a) Lap joint b) Bridge joint
Key
1 REBCO-superconducting layer
2 solder
Figure 2 — Soldering to join 2G HTS
However, the ISO 17279 series focuses on the direct autogenous joining of 1 μm to 3 μm thick
superconducting layers of 2G HTSs as shown in Figure 3 without filler metals and recovery of
superconducting properties by oxygenation annealing process, which shows almost none electrical
resistance at the joint.
a) Lap joint b) Bridge joint
Key
1 REBCO-superconducting layer
Figure 3 — Direct autogenous joining of 1 μm to 3 μm thick superconducting layers of 2G HTSs
for superconducting joint
ISO 17279-1 specifies requirements for the qualification of 2G HTS joining procedure. 2G HTS joints
should be capable of performing required electric, magnetic and mechanical properties and free from
serious imperfections in production and in service. To achieve that goal, it is necessary to provide
controls during design and fabrication.
ISO 17279-2 specifies requirements for the qualification of personnel performing welding and testing.
© ISO 2021 – All rights reserved vii
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SIST EN ISO 17279-3:2021
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SIST EN ISO 17279-3:2021
INTERNATIONAL STANDARD ISO 17279-3:2021(E)
Welding — Micro joining of second generation high
temperature superconductors —
Part 3:
Test methods for joints
1 Scope
This document specifies the requirements for the test methods for joint of micro-joining of 2G HTS to
fulfil the requirements of ISO 17279-1 and ISO 17279-2.
This document specifies test methods for determining the capability of joints for the production of the
specified quality. It defines specific test requirements, but does not assign those requirements to any
specific product group.
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 17279-1:2018, Welding — Micro joining of 2nd generation high temperature superconductors — Part 1:
General requirements
...
SLOVENSKI STANDARD
oSIST prEN ISO 17279-3:2020
01-maj-2020
Varjenje - Mikro spajanje visokotemperaturnih superprevodnikov druge generacije
- 3. del: Preskusne metode za zvarne spoje (ISO/DIS 17279-3:2020)
Welding - Micro joining of 2nd generation high temperature superconductors - Part 3:
Test methods for joints (ISO/DIS 17279-3:2020)
Soudage - Micro-assemblage des supraconducteurs à haute température critique de
deuxième génération - Partie 3: Méthode d'essai des connexions (ISO/DIS 17279-
3:2020)
Ta slovenski standard je istoveten z: prEN ISO 17279-3
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
oSIST prEN ISO 17279-3:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 17279-3:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 17279-3:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 17279-3
ISO/TC 44/SC 10 Secretariat: DIN
Voting begins on: Voting terminates on:
2020-02-19 2020-05-13
Welding — Micro joining of 2nd generation high
temperature superconductors —
Part 3:
Test methods for joints
Soudage — Micro-assemblage des supraconducteurs à haute température critique de deuxième
génération —
Partie 3: Méthode d'essai des connexions
ICS: 25.160.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 17279-3:2020(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 1
5 Test methods for joint . 1
5.1 General . 1
5.2 Visual testing . 2
5.2.1 Scope . 2
5.2.2 Qualification of test personnel . 2
5.2.3 Test equipment . 2
5.2.4 Surface condition and preparation . 2
5.2.5 Testing . 2
5.2.6 Acceptance criteria . 3
5.2.7 Test report . 3
5.3 Four-point-probe testing . 3
5.3.1 Scope . 3
5.3.2 Qualification of test personnel . 3
5.3.3 Test equipment . 3
5.3.4 Surface condition and preparation . 3
5.3.5 Testing . 3
5.3.6 Acceptance criteria . 9
5.3.7 Test report . 9
5.4 Field-decay testing . 9
5.4.1 Scope . 9
5.4.2 Qualification of test personnel . 9
5.4.3 Test equipment . 9
5.4.4 Surface condition and preparation . 9
5.4.5 Testing . 9
5.4.6 Acceptance criteria .12
5.4.7 Test teport.12
5.5 In-field testing .12
5.5.1 Scope .12
5.5.2 Qualification of test personnel .12
5.5.3 Test equipment .12
5.5.4 Surface condition and preparation .12
5.5.5 Testing .12
5.5.6 Acceptance criteria .13
5.5.7 Test report .13
5.6 Tensile testing .13
5.6.1 Scope .13
5.6.2 Qualification of test personnel .13
5.6.3 Test equipment .14
5.6.4 Surface condition and preparation .14
5.6.5 Testing .14
5.6.6 Acceptance criteria .14
5.6.7 Test report .14
5.7 Bend testing .15
5.7.1 Scope .15
5.7.2 Qualification of test personnel .15
5.7.3 Test equipment .15
© ISO 2020 – All rights reserved iii
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oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(E)
5.7.4 Surface condition and preparation .15
5.7.5 Testing .15
5.7.6 Acceptance criteria .16
5.7.7 Test report .16
5.8 Critical magnetic field testing .16
5.8.1 Scope .16
5.8.2 Qualification of test personnel .16
5.8.3 Test equipment .16
5.8.4 Surface condition and preparation .16
5.8.5 Testing .16
5.8.6 Acceptance criteria .17
5.8.7 Test report .17
5.9 Critical current density distribution testing .17
5.9.1 Scope .17
5.9.2 Qualification of test personnel .17
5.9.3 Test equipment .17
5.9.4 Surface condition and preparation .17
5.9.5 Testing .17
5.9.6 Acceptance criteria .18
5.9.7 Test report .18
5.10 Microscopic and X-ray diffraction testing .18
5.10.1 Scope .18
5.10.2 Qualification of test personnel .18
5.10.3 Test equipment .18
5.10.4 Surface condition and preparation .18
5.10.5 Testing .18
5.10.6 Acceptance criteria .19
5.10.7 Reporting .19
Annex A (normative) Report of visual testing results .20
Annex B (normative) Report of four-point-probe testing results .22
Annex C (normative) Report of field-decay testing result .25
Annex D (normative) Report of in-field testing results.28
Annex E (informative) Report of tensile testing results .30
Annex F (informative) Report of bend testing results .32
Annex G (informative) Report of critical magnetic field testing results .34
Annex H (informative) Report of critical current density distribution testing results .36
Annex I (informative) Report of microscopic and X-ray diffraction testing results .38
Bibliography .40
iv © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(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 10, Quality management in the field of welding.
A list of all parts in the ISO 17279 series can be found on the ISO website.
ISO 17279 consists of the following parts, under the general title Welding — Micro-joining of 2nd
generation high temperature superconductors:
— Part 1: General requirements for the procedure
— Part 2: Qualification for welding and testing personnel
— Part 3: Test methods for joint
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.
© ISO 2020 – All rights reserved v
---------------------- Page: 7 ----------------------
oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(E)
Introduction
The increasing use of 2nd generation high temperature superconductors (2G HTSs) and invention of
resistance-free joining on 2G HTSs have created the need for this International Standard in order to
ensure that joining is carried out in the most effective way and that appropriate control is exercised
over all aspects of the operation. ISO standards for micro-joining and joint evaluation procedure are
accordingly essential to get the best and uniform quality of 2G HTS joint.
Superconductor is a material that conducts electricity without resistance and has diamagnetism below
critical temperature (T ), critical magnetic field (B ) and critical current density (J ). Once set in motion,
c c c
electrical current flows forever in a closed loop of superconducting material under diamagnetism.
2G HTS constitutes of multi-layers and total thickness is around 60 to 90 μm and the superconducting
layer made from REBa Cu O is only 1 μm to 3 μm thick depending on manufacturer’s specifications.
2 3 7-x
Figure 1 shows schematic drawing of typical multiple layers, and the constituents and thicknesses of
each layer in the 2G HTS.
Dimensions in micro-meters
Key
1 Cu stabilizer
2 Ag overlayer
3 REBCO-superconducting layer
4 buffer stack
5 Hastelloy®C-276 substrate
NOTE Not to scale.
Figure 1 — Typical 2G HTS multi-layers, and the constituents and thicknesses of each layer
Currently soldering, brazing or any filler is applying in superconducting industry as shown in Figure 2,
which shows high electrical resistance at the joint providing fatal flaw in the superconductor.
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oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(E)
a) Lap joint b) Bridge joint
Key
1 REBCO-superconducting layer
2 solder
Figure 2 — Soldering to join 2G HTS
However, this standard focuses on the direct autogenous joining of 1 μm to 3 μm thick superconducting
layers of 2G HTSs as shown in Figure 3 without filler metals and recovery of superconducting properties
by oxygenation annealing process, which shows almost none electrical resistance at the joint.
a) Lap joint b) Bridge joint
Key
1 REBCO-superconducting layer
Figure 3 — Direct autogenous joining of 1 μm to 3 μm thick superconducting layers of 2G HTSs
for superconducting joint
The parts of this International Standard are listed in the foreword.
Part 1 specifies requirements for the qualification of 2G HTS joining procedure. 2G HTS joints should
be capable of performing required electric, magnetic and mechanical properties and free from serious
imperfections in production and in service. To achieve that goal, it is necessary to provide controls
during design and fabrication.
Part 2 specifies requirements for the qualification of personnel performing welding and testing.
Part 3 specifies test methods for determining the capability of joints for the production of the specified
quality. It defines specific test requirements, but does not assign those requirements to any specific
product group.
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oSIST prEN ISO 17279-3:2020
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oSIST prEN ISO 17279-3:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 17279-3:2020(E)
Welding — Micro joining of 2nd generation high
temperature superconductors —
Part 3:
Test methods for joints
1 Scope
This document specifies the requirements for the test methods for joint of micro-joining of 2G HTS to
fulfil the ISO 17279-1 and ISO 17279-2 requirements.
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 17279-1:2019, Welding — Micro-joining of 2nd generation high temperature superconductors —
Part 1: General Requirements for the procedure
ISO 17279-2, Welding — Micro joining of 2nd generation high temperature superconductors — Part 2:
Qualification for welding and testing personnel
ISO 15607:2019, Specification and qualification of welding procedures for metallic materials — General rules
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17279-1 and ISO 15607:2019,
Table 1 may apply if the terms are relevant to joining procedure for 2G HTS, apply.
No terms and definitions are listed in this document.
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/
4 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in ISO 17279-1 and
ISO 15607:2019, Table 1 may apply if the symbols and abbreviated terms are relevant to joining
procedure for 2G HTS, apply.
5 Test methods for joint
5.1 General
ISO 17279-1:2019, 5.5.4 describes requirements of testing personnel qualification, test methods,
witness during testing of the test specimens, and re-test. Especially, ISO 17279-1:2019, Table 1, shows
type of testing, extent of testing, confirmation of testing, and required tests for procedure qualification
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oSIST prEN ISO 17279-3:2020
ISO/DIS 17279-3:2020(E)
according to ISO 17279-1. ISO 17279-1:2019, 5.9, requires the acceptance criteria of the tests.
Manufacturer may have at their disposal sufficient competent personnel for the testing and operating
the test equipment, or may contract the specific tests to the specialized organizations. Manufacturer
may witness the tests from specimen preparation to data acquisition and analysis according to
manufacturer’s quality assurance requirements.
The operating procedures and cautions of the test equipment shall be applied when the equipment is
used for testing according to this standard. The operator of the specific equipment shall establish the
capability to perform the required test, and calibration and qualification of the test equipment shall be
maintained up to date according to appropriate quality assurance program. Qualification records and
certificates shall be kept up to date.
The tests except visual testing are carried out at the cryogenic environment and do not purport to
address the safety concerns associated with its use. It is the responsibility of whoever uses this method
to establish appropriate safety and health practices prior to use.
5.2 Visual testing
5.2.1 Scope
This clause defines the method of visual testing of materials and joints used in 2G HTS.
5.2.2 Qualification of test personnel
Testing shall be conducted by qualified personnel to carry out the testing. Personnel qualification shall
be done according to appropriate quality assurance program. Personnel conducting visual testing shall
annually pass an examination where their vision, with or without correction, meets the Jaeger J2 ne
...
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