prEN ISO 17779

SLOVENSKI STANDARD
01-april-2026
Trdo spajkanje - Popis in kvalifikacija postopkov trdega spajkanja kovinskih
materialov (ISO/DIS 17779:2026)
Brazing - Specification and qualification of brazing procedures for metallic materials
(ISO/DIS 17779:2026)
Hartlöten - Spezifizierung und Qualifizierung von Hartlöt-Prozessen für metallische
Werkstoffe (ISO/DIS 17779:2026)
Brasage fort - Descriptif et qualification d'un mode opératoire de brasage fort pour les
matériaux métalliques (ISO/DIS 17779:2026)
Ta slovenski standard je istoveten z: prEN ISO 17779
ICS:
25.160.50 Trdo in mehko lotanje Brazing and soldering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 17779
ISO/TC 44/SC 11
Brazing — Specification and
Secretariat: ANSI
qualification of brazing procedures
Voting begins on:
for metallic materials
2026-02-10
Brasage fort — Descriptif et qualification d'un mode opératoire
Voting terminates on:
de brasage fort pour les matériaux métalliques
2026-05-05
ICS: 25.160.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO/DIS 17779:2026(en)
DRAFT
ISO/DIS 17779:2026(en)
International
Standard
ISO/DIS 17779
ISO/TC 44/SC 11
Brazing — Specification and
Secretariat: ANSI
qualification of brazing procedures
Voting begins on:
for metallic materials
Brasage fort — Descriptif et qualification d'un mode opératoire
Voting terminates on:
de brasage fort pour les matériaux métalliques
ICS: 25.160.01
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 17779:2026(en)
ii
ISO/DIS 17779:2026(en)
Contents  Page
Foreword .iv
Introduction .v
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Preliminary brazing procedure specification (pBPS) . 3
5  Brazing procedure test . 3
6  Test piece . 3
6.1 General .3
6.2 Shape and dimensions of test pieces .3
6.3 Brazing of test pieces .4
7  Examination and testing . 4
7.1 Extent of testing .4
7.2 Test pieces . .4
7.3 Non-destructive testing .5
7.4 Destructive testing .5
7.4.1 General .5
7.4.2 Bend testing .5
7.4.3 Peel testing .5
7.4.4 Shear testing .5
7.4.5 Transverse tensile testing .5
7.5 Acceptance levels .6
7.6 Re-testing .6
8  Essential variables and range of qualification . 6
8.1 General .6
8.2 Brazing process.6
8.3 Product type .6
8.4 Type of joint .7
8.5 Branch connection .7
8.6 Parent material group(s) .7
8.7 Filler metals, flux and brazing filler application .7
8.8 Dimensions .8
8.9 Filler metal flow direction .8
8.10 Post braze heat treatment .9
8.11 Related to the technical and quality control .9
9  Brazing procedure qualification record (BPQR) . 9
10  Brazing procedure specification (BPS) . 9
Annex A (informative)  Quality requirements for brazing .11
Annex B (informative)  Brazing procedure specification (BPS) .12
Annex C (informative)  Examples of test pieces .13
Annex D (informative)  Brazing procedure qualification record (BPQR) .15
Annex E (normative)  Material grouping system .16
Annex ZA (informative)  Relationship between this European Standard and the essential
requirements of EU Directive 2014/68/EU aimed to be covered .18
Bibliography .20

iii
ISO/DIS 17779:2026(en)
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 11, Qualification requirements for welding and allied processes personnel, 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).
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.

iv
ISO/DIS 17779:2026(en)
Introduction
The purpose of this document is to provide a general set of rules for brazing procedure qualification
independent of product or application.
All new brazing procedure tests are to be carried out in accordance with this document from the date of
its issue. However, this document does not invalidate previous brazing procedure tests made to former
standards or specifications.
Where additional tests need to be carried out to make the qualification technically equivalent, it is only
necessary to perform the additional tests on a test piece which should be made in accordance with this
document.
v
DRAFT International Standard ISO/DIS 17779:2026(en)
Brazing — Specification and qualification of brazing
procedures for metallic materials
1  Scope
This document specifies requirements for the specification and qualification of brazing procedures for
brazing of metallic materials.
This document specifies requirements for brazing of the test piece, testing of the test specimen, essential
variables and their range of qualification, acceptance criteria, brazing procedure qualification record
(BPQR) and brazing procedure specification (BPS).
This document does not cover testing of residual stresses, corrosion resistance and impact properties.
This document applies to the following brazing processes according to ISO 857-2 and ISO 4063:2023 with
local and global heating:
— 911 Infrared brazing;
— 912 Flame brazing, torch brazing;
— 913 Laser beam brazing;
— 914 Electron beam brazing;
— 916 Induction brazing;
— 918 Resistance brazing;
— 919 Diffusion brazing;
— 921 Furnace brazing;
— 922 Vacuum brazing;
— 923 Dip-bath brazing;
— 924 Salt-bath brazing;
— 925 Flux bath brazing;
— 926 Immersion brazing;
— 972 Arc weld brazing.
This document does not apply to brazing for aerospace applications covered by ISO 11745.
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 857-2:2005, Welding and allied processes — Vocabulary — Part 2: Soldering and brazing processes and
related terms
ISO/DIS 17779:2026(en)
ISO 4063:2023, Welding, brazing, soldering and cutting — Nomenclature of processes and reference numbers
ISO 18279:2023, Brazing — Imperfections in brazed joints
ISO/TR 25901-1:2016, Welding and allied processes — Vocabulary — Part 1: General terms
EN 12797, Brazing — Destructive tests of brazed joints
EN 12799, Brazing — Non-destructive examination of brazed joints
ISO 857-2, Welding and allied processes — Vocabulary — Part 2: Soldering and brazing processes and related
terms
ISO 13585, Brazing — Qualification testing of brazers and brazing operators
ISO 17672, Brazing — Filler metals
ISO 18496, Brazing — Fluxes for brazing — Classification and technical delivery conditions
ISO/TR 25901-1, Welding and allied processes — Vocabulary — Part 1: General terms
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 857-2, ISO/TR 25901-1 and the
following apply.
ISO and IEC maintain terminology 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/
3.1
brazing
joining process using filler metal with a liquidus temperature above 450 °C
[SOURCE: ISO 857-2:2005, 3.1.2.]
3.2
brazing procedure specification
BPS
document that has been qualified and provides the required variables of the brazing procedure to ensure
repeatability during production brazing
3.3
preliminary brazing procedure specification
pBPS
document containing the required variables of the brazing procedure which is not yet qualified
3.4
brazing procedure qualification record
BPQR
record comprising all necessary data from qualification of a brazing procedure qualification record (3.4)
3.5
manufacturer
workshop or site or both which is (are) under the same technical and quality management
3.6
examiner
person who has been appointed to verify compliance with the applicable standard
Note 1 to entry: In certain cases, an external independent examiner can be required.

ISO/DIS 17779:2026(en)
[SOURCE: ISO/TR 25901-1:2016, 2.5.29]
3.7
examining body
organization that has been appointed to verify compliance with the applicable standard
Note 1 to entry: In certain cases, an external independent examining body can be required.
[SOURCE: ISO/TR 25901-1:2016, 2.5.30]
3.8
filler metal
added metal applied to brazed joints
Note 1 to entry: Filler metal can be in the form of wire, inserts, powder, pastes, foil, etc.
3.9
flux
non-metallic material which, when molten, promotes wetting by removing existing oxide or other detrimental
films from the surfaces to be joined and prevents their re-formation during the joining operation
[SOURCE: ISO 857-2:2005, 3.2.2]
3.10
test piece
brazed assembly which is used for testing purposes
3.11
test specimen
part or portion cut from the test piece in order to perform specified destructive testing
[SOURCE: ISO/TR 25901-1:2016, 2.2.1.6]
4  Preliminary brazing procedure specification (pBPS)
A preliminary brazing procedure specification shall be prepared. An example pBPS form is shown in
Annex B.
5  Brazing procedure test
The brazing and testing of test pieces shall be in accordance with Clause 6 and Clause 7.
A brazer or brazing operator who undertakes the brazing procedure test satisfactorily in accordance with
this document shall be considered qualified for the appropriate range of qualification in accordance with
ISO 13585, provided that the relevant testing requirements are met.
6  Test piece
6.1 General
The test piece or pieces shall be brazed using a type of joint design proposed in the pBPS and be representative
for the intended production.
6.2  Shape and dimensions of test pieces
If not specified in application standard, the shape and dimension of the test piece shall be agreed by the
contracting parties.
ISO/DIS 17779:2026(en)
The test piece is typically a basic lap or butt joint in sheet material or a sleeve joint in tube.
NOTE Examples of applicable joint configurations are given in Annex C.
The size of the test piece shall be sufficient to allow all required tests to be carried out. Additional test pieces
may be prepared in order to allow for additional tests and/or for re-testing specimens.
6.3  Brazing of test pieces
Preparation and brazing of test pieces shall be carried out in accordance with the pBPS, and under the
general conditions of brazing in production, which they shall represent.
brazing and testing of the test pieces shall be witnessed by an examiner or an examining body.
7  Examination and testing
7.1  Extent of testing
As a minimum, testing shall be carried out in accordance with Table 1 , EN 12797 and EN 12799.
Table 1 — Examination and testing of the test pieces
Test piece Type of test Extent of testing
Visual, and 100 %
a
T-joint Metallographic, or 2 sections
b
Bend 2 specimens
Visual, and 100 %
a
Metallographic, and 2 sections
Lap joint
Shear, or 2 specimens
Peel 2 specimens
Visual, and 100 %
a
Metallographic, and 2 sections
Butt joint
Tensile, or 2 specimens
b
Bend 2 specimens
a
Macro sections. If additional micro sections are required, they shall be specified.
b
One first surface and one second surface test.
NOTE For specific service, material or manufacturing conditions, more comprehensive testing than is specified
by this document can be needed to gain more information and to avoid repeating the brazing procedure test at a later
date to obtain additional test data.
Consequently, an application standard can specify additional tests, e.g.:
— lon
...