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

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Status
Published
Publication Date
16-Mar-2020
Current Stage
6060 - International Standard published
Start Date
17-Mar-2020
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
---------------------- Page: 1 ----------------------
ISO 17927-2:2020(E)
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© ISO 2020

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ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
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

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bodies (ISO member bodies). The work of preparing International Standards is normally carried out

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electrotechnical standardization.

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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
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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