Welding for aerospace applications — Fusion welding of metallic components — Part 2: Acceptance criteria

This document specifies acceptance criteria for fusion weldments on metallic components. It is to be applied provided it is referenced or approved by the responsible engineering/design authority. This document covers the following processes given in Table 1 and the material groups given in Table 2.

Soudage pour applications aérospatiales — Soudage par fusion des composants métalliques — Partie 2: Critères d'acceptation

General Information

Status
Published
Publication Date
16-Mar-2020
Current Stage
6060 - International Standard published
Start Date
17-Mar-2020
Due Date
28-Aug-2021
Completion Date
17-Mar-2020
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ISO 17927-2:2020 - Welding for aerospace applications -- Fusion welding of metallic components
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INTERNATIONAL ISO
STANDARD 17927-2
First edition
2020-03
Welding for aerospace applications —
Fusion welding of metallic
components —
Part 2:
Acceptance criteria
Soudage pour applications aérospatiales — Soudage par fusion des
composants métalliques —
Partie 2: Critères d'acceptation
Reference number
ISO 17927-2:2020(E)
©
ISO 2020

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ISO 17927-2:2020(E)

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ii © ISO 2020 – All rights reserved

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ISO 17927-2:2020(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Conformance . 2
6 Acceptance criteria . 2
6.1 General . 2
6.2 Limits for imperfections . 3
Bibliography .10
© ISO 2020 – All rights reserved iii

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ISO 17927-2:2020(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
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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
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes,
Subcommittee SC 14, Welding and brazing in aerospace.
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.
A list of all parts in the ISO 17927 series can be found on the ISO website.
iv © ISO 2020 – All rights reserved

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INTERNATIONAL STANDARD ISO 17927-2:2020(E)
Welding for aerospace applications — Fusion welding of
metallic components —
Part 2:
Acceptance criteria
1 Scope
This document specifies acceptance criteria for fusion weldments on metallic components.
It is to be applied provided it is referenced or approved by the responsible engineering/design authority.
This document covers the following processes given in Table 1 and the material groups given in Table 2.
Table 1 — Fusion welding processes covered by this document
Process Process number (ISO 4063:2009)
Oxyfuel welding 31
Gas shielded arc welding with non-consumable
14
tungsten electrode, gas tungsten arc welding
Plasma arc welding 15
Electron beam welding 51
Laser welding, laser beam welding 52
Table 2 — Material groups covered by this document
Material group Description
A Unalloyed steel, low alloyed steels, high alloyed ferritic steels
B Austenitic, martensitic and precipitation hardening steels
C Titanium and titanium alloys, niobium, zirconium and other reactive metals
D Aluminium and magnesium alloys
E Materials that do not conform to other material groups (e.g. molybdenum, tungsten, cop-
per alloys)
F Nickel alloys, cobalt alloys.
NOTE  Material groups according to ISO 24394.
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 6520-1, Welding and allied processes — Classification of geometric imperfections in metallic
materials — Part 1: Fusion welding
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2020 – All rights reserved 1

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ISO 17927-2:2020(E)

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 http:// www .electropedia .org/
3.1
design/engineering authority
organization having the responsibility for the structural integrity or maintenance of airworthiness of
the hardware and compliance with all relevant documents
[SOURCE: ISO 24394:2018, 3.8]
4 Symbols and abbreviated terms
t nominal wall or plate thickness
h dimension of imperfection
b width of weld reinforcement or fillet
a nominal throat thickness
z nominal leg length
5 Conformance
When conformance to this document is claimed, all provisions of this document are to be complied
with, except those for provisions that the design/engineering authority specifically exempts.
6 Acceptance criteria
6.1 General
The dimension of any discontinuity shall be defined by its largest dimension. Two or more
discontinuities shall be treated as one when the spacing between them is less than the dimension of the
larger discontinuity.
Surface imperfections of the weld may be mechanically removed provided that the weld and adjacent
base metal maintain the minimum thickness without undercutting the plane of the base metal. Any
additional engineering requirements (e.g. surface roughness) shall also be met. In the case of weldments
with variations in cross-section along the joint, the thickness, t, shall be considered to be the minimum
thickness at the imperfections.
Imperfections that will be removed in subsequent machining shall not be cause for rejection provided
inspection is carried out after machining. Any weldment with unacceptable imperfections which has
gone through a subsequent manufacturing operation that affects the metallurgical characteristics
(other than hydrogen embrittlement relief) or that cannot be rewelded without affecting final
metallurgical or surface characteristics shall be rejected.
For fillet welds, the minimum size shall be as specified on the engineering drawings.
When fillet weld size is not specified, the minimum leg length shall be:
— for single side weld: 1,5 t ;
min
— for double side weld: 1 t ;
min
where t is the minimum nominal wall or plate thickness.
min
2 © ISO 2020 – All rights
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