Welding - Micro joining of 2nd generation high temperature superconductors - Part 2: Qualification for welding and testing personnel (ISO 17279-2:2018)

This document specifies the qualification requirements for personnel performing micro-joining and oxygenation anneling, and testing the 2G HTS test joints.

Schweißen - Mikrofügen von Hochtemperatursupraleitern der zweiten Generation - Teil 2: Qualifizierung für Schweiß- und Prüfpersonal (ISO 17279-2:2018)

Dieses Dokument legt die Qualifizierungsanforderungen fest für Personal, welches das Mikrofügen, das Oxidationsglühen und das Prüfen von 2G HTS Verbindungsprüfungen ausführt.

Soudage - Micro-assemblage des supraconducteurs à haute température de deuxième génération - Partie 2: Qualification du personnel en soudage et d'essai (ISO 17279-2:2018)

Le présent document spécifie les exigences de qualification pour le personnel réalisant le micro-assemblage et le recuit d'oxigénation, et les essais des supraconducteurs à haute température de deuxième génération (2G HTS).

Varjenje - Mikro spajanje visokotemperaturnih superprevodnikov druge generacije - 2. del: Usposobljenost osebja za varjenje in preskušanje (ISO 17279-2:2018)

Ta mednarodni standard določa zahteve za usposobljenost osebja za varjenje in preskušanje za mikro spajanje visokotemperaturnih superprevodnikov druge generacije za izpolnjevanje zahtev standardov ISO 17279-1 in ISO 17279-3.

General Information

Status
Published
Publication Date
20-Nov-2018
Technical Committee
Drafting Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
21-Nov-2018
Completion Date
21-Nov-2018

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SLOVENSKI STANDARD
SIST EN ISO 17279-2:2019
01-marec-2019
Varjenje - Mikro spajanje visokotemperaturnih superprevodnikov druge generacije
- 2. del: Usposobljenost osebja za varjenje in preskušanje (ISO 17279-2:2018)

Welding - Micro joining of 2nd generation high temperature superconductors - Part 2:

Qualification for welding and testing personnel (ISO 17279-2:2018)

Schweißen - Mikrofügen von Hochtemperatursupraleitern der zweiten Generation - Teil

2: Qualifizierung für Schweiß- und Prüfpersonal (ISO 17279-2:2018)
Soudage - Micro-assemblage des supraconducteurs à haute température de deuxième

génération - Partie 2: Qualification du personnel en soudage et d'essai (ISO 17279-

2:2018)
Ta slovenski standard je istoveten z: EN ISO 17279-2:2018
ICS:
03.100.30 Vodenje ljudi Management of human
resources
25.160.10 Varilni postopki in varjenje Welding processes
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
SIST EN ISO 17279-2:2019 en,fr,de

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

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SIST EN ISO 17279-2:2019
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SIST EN ISO 17279-2:2019
EN ISO 17279-2
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2018
EUROPÄISCHE NORM
ICS 25.160.01
English Version
Welding - Micro joining of 2nd generation high
temperature superconductors - Part 2: Qualification for
welding and testing personnel (ISO 17279-2:2018)
Soudage - Micro-assemblage des supraconducteurs à Schweißen - Mikrofügen von

haute température de deuxième génération - Partie 2: Hochtemperatursupraleitern der zweiten Generation -

Qualification du personnel en soudage et d'essai (ISO Teil 2: Qualifizierung für Schweiß- und Prüfpersonal

17279-2:2018) (ISO 17279-2:2018)
This European Standard was approved by CEN on 12 October 2018.

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: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17279-2:2018 E

worldwide for CEN national Members.
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SIST EN ISO 17279-2:2019
EN ISO 17279-2:2018 (E)
Contents Page

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

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SIST EN ISO 17279-2:2019
EN ISO 17279-2:2018 (E)
European foreword

This document (EN ISO 17279-2:2018) 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 May 2019, and conflicting national standards shall be

withdrawn at the latest by May 2019.

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 17279-2:2018 has been approved by CEN as EN ISO 17279-2:2018 without any

modification.
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SIST EN ISO 17279-2:2019
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SIST EN ISO 17279-2:2019
INTERNATIONAL ISO
STANDARD 17279-2
First edition
2018-10
Welding — Micro joining of 2nd
generation high temperature
superconductors —
Part 2:
Qualification for welding and testing
personnel
Soudage — Micro-assemblage des supraconducteurs à haute
température de deuxième génération —
Partie 2: Qualification du personnel en soudage et d'essai
Reference number
ISO 17279-2:2018(E)
ISO 2018
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

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 2018 – All rights reserved
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

4 Symbols and abbreviated terms ........................................................................................................................................................... 1

5 Qualification of personnel performing micro-joining and oxygenation annealing ........................1

5.1 General ........................................................................................................................................................................................................... 1

5.2 Essential variables and range of qualification ............................................................................................................. 2

5.3 Qualification methods ....................................................................................................................................................................... 3

5.3.1 Qualification based on standard test joint specimen ....................................................................... 3

5.3.2 Qualification by testing the test joints ........................................................................................................... 3

5.4 Re-qualification ...................................................................................................................................................................................... 3

5.5 Qualification examination and examination report ................................................................................................ 4

5.6 Period of validity ................................................................................................................................................................................... 4

5.6.1 Initial qualification ......................................................................................................................................................... 4

5.6.2 Confirmation of the validity ................................................................................................................................... 4

5.6.3 Prolongation of qualification ................................................................................................................................. 4

6 Qualification of personnel performing the test joints testing............................................................................... 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Essential variables and range of qualification ............................................................................................................. 5

6.3 Qualification methods ....................................................................................................................................................................... 5

6.4 Re-qualification ...................................................................................................................................................................................... 6

6.5 Qualification examination and examination record ............................................................................................... 6

6.6 Period of validity ................................................................................................................................................................................... 6

6.6.1 Initial qualification ......................................................................................................................................................... 6

6.6.2 Confirmation of the validity ................................................................................................................................... 6

6.6.3 Prolongation of qualification ................................................................................................................................. 6

7 Third-party check ................................................................................................................................................................................................ 6

Annex A (normative) Functional knowledge of micro-joining and oxygenation annealing

apparatus ..................................................................................................................................................................................................................... 8

Annex B (normative) Knowledge of micro-joining and oxygenation annealing technology ......................9

Annex C (informative) Data report for micro-joining and oxygenation annealing, and

testing of the test joints ..............................................................................................................................................................................11

Annex D (informative) Test results......................................................................................................................................................................14

Annex E (informative) Check list for qualification of personnel performing micro-joining,

oxygenation annealing, and testing ...............................................................................................................................................16

Bibliography .............................................................................................................................................................................................................................19

© ISO 2018 – All rights reserved iii
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(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.

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.
A list of all parts in the ISO 17279 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(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 document in order to ensure that

joining is carried out in the most effective way and that appropriate control is exercized 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.

A 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.

A 2G HTS consists of multi-layers and its total thickness is around between 60 µm and 100 µm with or

without surrounding copper stabilizer. The superconducting layer made from ReBa Cu O -x (ReBCO,

2 3 7

abbreviated term of ReBa Cu O ) is only between 1 µm and 2 µm thick depending on manufacturer’s

2 3 7-x

specifications. Re stands for Rare Earth materials, of which gadolinium, yttrium and samarium are used

for 2nd generation high temperature superconducting materials. Figure 1 shows schematic drawing of

typical multiple layers with surrounded copper stabilizer, and the constituents and thicknesses of each

layer in the 2G HTS. The two layers of No. 1 in Figure 1 does not exist in stabilizer-free 2G HTS.

Key
1 20 µm Cu stabilizer 4 5 buffing layers (total 160 nm)
2 2 µm Ag overlayer 5 50 µm hastelloy substrate
3 between 1 µm and 2 µm ReBCO super-conducting layer
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 applied 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 superconducting layer
2 solder
Figure 2 — Soldering to join 2G HTS
© ISO 2018 – All rights reserved v
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(E)

However, this document focuses on the direct autogenous joining of between 1 μm and 2 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 no electrical

resistance at the joint.
a) Lap joint b) Bridge joint
Key
1 superconducting layer

Figure 3 — Direct autogenous joining of two superconducting layers of 2G HTSs for

superconducting joint
vi © ISO 2018 – All rights reserved
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SIST EN ISO 17279-2:2019
INTERNATIONAL STANDARD ISO 17279-2:2018(E)
Welding — Micro joining of 2nd generation high
temperature superconductors —
Part 2:
Qualification for welding and testing personnel
1 Scope

This document specifies the qualification requirements for personnel performing micro-joining and

oxygenation anneling, and testing the 2G HTS test joints.
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 15607:2003, Specification and qualification of welding procedures for metallic materials — General rules

ISO 17279-1, Welding — Micro-joining of 2nd generation high temperature superconductors — Part 1:

General requirements for the procedure
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 17279-1 apply.

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 https: //www .electropedia .org/
4 Symbols and abbreviated terms

The abbreviated terms listed in ISO 15607:2003, Table 1, relevant to joining procedure for 2G HTS

shall apply.
5 Qualification of personnel performing micro-joining and oxygenation
annealing
5.1 General

Manufacturers shall have at their disposal sufficient competent personnel for the 2G HTS micro-

joining operations in accordance with specified requirements. The manufacturer shall be responsible

for developing the training program, written practice, examination, and practical demonstrations

for personnel performing the micro-joining in accordance with this document. These shall establish

the capability of the personnel performing the required micro-joining and oxygenation annealing.

Qualification records and certificates shall be kept up-to-date. The procedures for micro-joining and

oxygenation annealing are presented in ISO 17279-1:2018, 5.4 to 5.6.
© ISO 2018 – All rights reserved 1
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(E)

The essential variables and ranges of qualification and qualification requirements for personnel

qualification are specified in 5.1 to 5.5 and the validity is specified in 5.6. If micro-joining and/

or oxygenation-annealing is required outside the range of qualification, a new qualification test is

required. The personnel who performs micro-joining and oxygenation annealing shall be successfully

qualified for this specific method. The qualification is valid for that method only

5.2 Essential variables and range of qualification

The variables include joint design, joint width, joint materials, apparatuses, and micro-joining and

oxygenation-annealing parameters.

A successful test joint made in specific joint design qualifies a personnel only for specific joint design.

A change from one type of joint design to another type of joint design requires additional qualification.

A successful joint dimension of any specific material qualifies a personnel for only specific material

dimension. A change from one joint dimension to another dimension requires additional qualification.

A successful test joint made with specific material qualifies a personnel for only specific superconducting

material. A change from one superconducting material to another material requires additional

qualification.

The apparatuses shall be periodically calibrated according to the manufacturer’s specification.

Only apparatuses with valid calibration and qualification shall be applied to the micro-joining and

oxygenation annealing for personnel qualification. Table 1 shows essential variables of joint design,

joint widths, superconducting materials and apparatuses. Table 2 shows essential variable parameters

for micro-joining and oxygenation-annealing. These parameters provide sensitive to the joint quality

and determine final joint quality. Any changes of essential variables qualified require re-qualification.

Table 1 — Essential variables required for qualification of joint, materials and apparatuses

Joint design Joint width (mm) Superconducting Apparatuses for micro-
materials joining and oxygenation-
annealing

Lap or Bridge 3 mm, 4 mm, 6 mm, YBCO, GdBCO, SmBCO, or Specific model or type changes,

12 mm, or specifica- specifications removal, addition or change of
tions control systems

Table 2 — Essential variables required for qualification of micro-joining and oxygenation-

annealing
Micro-joining Oxygenation annealing
Removal of Cu stabilizer and or Ag overlayer Heating rate
Chamber (furnace) internal vacuum level Annealing temperature
Heating rate Dwell time
Peak joining temperature Oxygen flow rate
Mechanical pressure to the joint Chamber (furnace) internal pressure
Dwell time at the peak joining temperature Cooling rate to room temperature
Cooling rate to room temperature or oxygenation an-
nealing temperature

The range of qualification for other variables, except as listed in Table 1 and Table 2, shall be specified

in the manufacturer’s specification.
2 © ISO 2018 – All rights reserved
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(E)
5.3 Qualification methods
5.3.1 Qualification based on standard test joint specimen

Test joint specimens shall be made in accordance with a WPS. The micro-joining and oxygenation

annealing of test specimens shall be witnessed by an inspector or designated personnel. Removal of

Cu stabilizer and or Ag overlayer shall also be the responsibility of the personnel for micro-joining and

oxygenation annealing, since surface condition of superconducting layer impacts joint quality. Three

specimens shall be tested for each joint design.

The test specimens shall be marked with the identification, by personnel performing micro-joining

and oxygenation annealing or designated personnel before joining starts. The inspector may stop the

micro-joining and/or oxygenation-annealing at any time during the test if it appears that the personnel

for micro-joining and/or oxygenation-annealing does not have the skills to meet the requirements of

this document.

The test specimens shown in ISO 17279-1:2018, Figure 4 and Figure 5, shall be used for the standard

test joint. A personnel performing micro-joining and oxygenation-annealing who has successfully

completed the provisions of 5.3.2 shall be considered qualified for the method (pressurized partial

micro-melting diffusion or pressurized solid-state diffusion), joint design (lap or bridge), joint width,

superconducting material, and type of micro-joining and oxygenation-annealing apparatuses used for

the test.

The technical knowledge of micro-joining and oxygenation annealing and the apparatuses to be used

shall be examined for personnel qualification, as per Annexes A and B.
5.3.2 Qualification by testing the test joints

ISO 17279-1:2018, 5.5.4 and Table 1, describe the test requirements for procedure qualification. In

ISO 17279-1:2018, Table 1, only test methods of visual test, critical current test, I , and tensile test

with reinforcement shall be tested on the test joints (see ISO 17279-3 for test methods) for personnel

qualification. Table 3 shows personnel qualification requirements. Joint critical current, I , is extremely

important in superconductors. In addition, other testing methods described in ISO 17279-1:2018,

5.5.4.2 and Table 1, may be performed for the qualification if required by manufacturer.

Table 3 — Qualification requirements for personnel performing micro-joining and oxygenation

annealing
Type of test Extent of test Confirmation of test

Visual test 3 joined specimens Check that the joint is free from any imperfections

and de-bonding, etc., and also check appearances
and alignments, etc.

Critical current test, I , by 3 joined specimens Check that the joint I is 80 % and higher to the

c c
four-point-probes virgin materials of 2G HTS, or that it meets the
manufacturer’s specifications

Tensile test with reinforce- 3 joined specimens from Ccheck that joint tensile strength is equal to the

ment the qualified I joined test virgin materials of 2G ReBCO HTS, or that it meets

specimen the manufacturer’s specificatiosn and also check
that joint strength shows the same I as the virgin
materials of 2G ReBCO HTS
5.4 Re-qualification

If one of three specimens fails to meet the acceptance criteria in ISO 17279-1:2018, 5.9, or Table 3, the

test shall be rejected. Two additional test specimens shall be joined using the same procedure and

subjected to testing. If one of these extra specimens fails to meet the requirements, the personnel for

1) Under preparation.
© ISO 2018 – All rights reserved 3
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SIST EN ISO 17279-2:2019
ISO 17279-2:2018(E)

micro-joining and oxygenation-annealing shall be required to have additional training before new tests

are made.

If two of three specimens or all three specimens fail to meet the acceptance criteria in ISO 17279-1:2018,

5.9 or Table 3, the personnel for micro-joining and oxygenation-annealing shall be required to have

additional training before new tests are made.
5.5 Qualification examination and examination report

The results of all testing shall verify that the personnel for micro-joining and oxygenation-annealing

passed the qualification examination. This shall be documented. The format of the documentation

shall be decided by the manufacturer. A suggested test report is shown in Table 4 and Annex C. The

documentation can be on paper or electronic media.
Table 4 — Test report for personnel qualification
Examinee Joint design Width Superconducting Visual Critical cur- Tensile testing
material testing rent (I ) test- with reinforce-
Lap Bridge
ing ment
A X 4 YBCO P F F
B X 6 GdBCO P P P
C X 12 SmBCO F P P
NOTE P: passed or qualified, F: failed.
5.6 Period of validity
5.6.1 Initial qualification

The personnel qualification for micro-joining and oxygenation-annealing is valid from the date when

the required examination has been carried out and acceptable results are available. The qualification is

valid for a period of 2 years, the period of validity ending on the last day of the month.

5.6.2 Confirmation of the validity

The qualifications of the personnel for micro-joining and oxygenation-annealing shall be confirmed

every 6 months by the person responsible for welding activities or examiner/examining body or

employer. This confirms that the welder has worked within the range of qualification and extended the

validity of the qualification for a further 6-month period.
5.6.3 Prolongation of qualification

The personnel qualification for micro-joining and oxygenation-annealing can be extended every 2 years

by an examiner. Before the certif
...

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