SIST EN ISO 2553:2014

SLOVENSKI STANDARD
SIST EN ISO 2553:2014
01-marec-2014
1DGRPHãþD
SIST EN 22553:1995
SIST ISO 2553:1995
Varjenje in sorodni postopki - Prikazovanje na risbah s simboli - Varjeni spoji
(ISO 2553:2013)
Welding and allied processes - Symbolic representation on drawings - Welded joints
(ISO 2553:2013)
Schweißen und verwandte Prozesse - Symbolische Darstellung in Zeichnungen -
Schweiß- und Lötverbindungen (ISO 2553:2013)
Soudage et techniques connexes - Représentations symboliques sur les dessins - Joints
soudés (ISO 2553:2013)
Ta slovenski standard je istoveten z: EN ISO 2553:2013
ICS:
01.100.20 Konstrukcijske risbe Mechanical engineering
drawings
25.160.40 Varjeni spoji in vari Welded joints
SIST EN ISO 2553:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 2553:2014

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SIST EN ISO 2553:2014

EUROPEAN STANDARD
EN ISO 2553

NORME EUROPÉENNE

EUROPÄISCHE NORM
December 2013
ICS 01.100.20; 25.160.40 Supersedes EN 22553:1994
English Version
Welding and allied processes - Symbolic representation on
drawings - Welded joints (ISO 2553:2013)
Soudage et techniques connexes - Représentations Schweißen und verwandte Prozesse - Symbolische
symboliques sur les dessins - Joints soudés (ISO Darstellung in Zeichnungen - Schweiß- und
2553:2013) Lötverbindungen (ISO 2553:2013)
This European Standard was approved by CEN on 20 December 2013.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2553:2013 E
worldwide for CEN national Members.

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SIST EN ISO 2553:2014
EN ISO 2553:2013 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 2553:2014
EN ISO 2553:2013 (E)
Foreword
This document (EN ISO 2553:2013) has been prepared by Technical Committee ISO/TC 44 “Welding and
allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding”, 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 June 2014, and conflicting national standards shall be withdrawn at
the latest by June 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 22553:1994.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 2553:2013 has been approved by CEN as EN ISO 2553:2013 without any modification.
3

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SIST EN ISO 2553:2014

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SIST EN ISO 2553:2014
INTERNATIONAL ISO
STANDARD 2553
Fourth edition
2013-12-15
Welding and allied processes —
Symbolic representation on drawings
— Welded joints
Soudage et techniques connexes — Représentations symboliques sur
les dessins — Joints soudés
Reference number
ISO 2553:2013(E)
©
ISO 2013

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SIST EN ISO 2553:2014
ISO 2553:2013(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved

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SIST EN ISO 2553:2014
ISO 2553:2013(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Welding symbol . 4
4.1 General . 4
4.2 Basic welding symbol . 4
4.3 Welding symbol systems . 5
4.4 Elementary symbols . 5
4.5 Supplementary symbols . 9
4.6 Arrow line .14
4.7 Reference line and weld location .16
4.8 Tail .19
5 Dimensioning of welds .19
5.1 General .19
5.2 Cross-sectional dimensions .19
5.3 Length dimensions .19
5.4 Butt welds .20
5.5 Fillet welds .21
5.6 Plug welds in circular holes .21
5.7 Plug welds in slots .21
5.8 Spot welds .22
5.9 Seam welds .22
5.10 Edge welds .22
5.11 Stud welds .22
5.12 Overlay welds .22
6 Dimensioning of joint preparations .34
6.1 General .34
6.2 Root gap .34
6.3 Included angle .34
6.4 Radii and root faces — U and J butt joints .35
6.5 Depth of joint preparation .35
6.6 Countersink angle for plug and slot welds .37
7 Alternative butt weld symbol with required weld quality .38
7.1 General .38
7.2 Example .38
Annex A (informative) Examples of the use of welding symbols .39
[9]
Annex B (informative) Tolerances and transition points for weld types .50
Annex C (informative) Alternative methods for designating intermittent butt and fillet welds .51
Bibliography .54
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SIST EN ISO 2553:2014
ISO 2553:2013(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. 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. 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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC Welding and allied processes, Subcommittee SC 7,
Representation and terms.
This fourth edition cancels and replaces the third edition (ISO 2553:1992), which has been technically
revised.
Requests for official interpretations of any aspect of this standard should be directed to the Secretariat of
ISO/TC 44/SC 7 via your national standards body, a complete listing of which can be found at ww.iso.org.
iv © ISO 2013 – All rights reserved

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SIST EN ISO 2553:2014
ISO 2553:2013(E)

Introduction
The symbols given in this standard can be used on technical drawings for welded components. Design-
related specifications, such as type, thickness, and length of weld, weld quality, surface treatment, filler
material and testing specifications, can be indicated directly at the weld by means of the symbols given
in this standard. The principals of this standard can be applied to brazed and soldered joints.
Clarity may be improved by references to collective information in the drawings or references to
additional design-related documents.
Preparation for production may require detailed welding-related planning. The type of representation
described in this standard can be used for this purpose and complemented by additional production-
related information (e.g. welding position, welding process, WPS, weld preparation, preheating …).
This information is often given in production-related documents, such as work schedules or welding
procedure specifications (WPS).
Technical drawings are intended to clearly and understandably illustrate design-related specifications.
Welding-related drawings should be prepared and checked by specially trained personnel (see ISO 14731).
This edition of ISO 2553 recognizes that there are two different approaches in the global market to
designate the arrow side and other side on drawings, and allows for either to be used in isolation, to suit
a particular market need. Application of either approach identifies a welding symbol in accordance with
this International Standard. The approach in accordance with system A is based on ISO 2553:1992. The
approach in accordance with system B is based upon standards used by Pacific Rim countries.
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SIST EN ISO 2553:2014

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SIST EN ISO 2553:2014
INTERNATIONAL STANDARD ISO 2553:2013(E)
Welding and allied processes — Symbolic representation
on drawings — Welded joints
1 Scope
This International Standard defines the rules to be applied for symbolic representation of welded joints
on technical drawings. This may include information about the geometry, manufacture, quality and
testing of the welds. The principles of this standard may also be applied to soldered and brazed joints.
It is recognized that there are two different approaches in the global market to designate the arrow side
and other side on drawings. In this Interational Standard:
— clauses, tables and figures which carry the suffix letter “A” are applicable only to the symbolic
representation system based on a dual reference line;
— clauses, tables and figures which carry the suffix letter “B” are applicable only to the symbolic
representation system based on a single reference line;
— clauses, tables and figures which do not have the suffix letter “A” or “B” are applicable to both systems.
The symbols shown in this International Standard may be combined with other symbols used on
technical drawings, for example to show surface finish requirements.
An alternative designation method is presented which may be used to represent welded joints on
drawings by specifying essential design information such as weld dimensions, quality level, etc. The
joint preparation and welding process(es) are then determined by the production unit in order to meet
the specified requirements.
NOTE Examples given in this International Standard, including dimensions, are illustrative only and are
intended to demonstrate the proper application of principles. They are not intended to represent good design
practices, or to replace code or specification requirements.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 128 (all parts), Technical drawings — General principles of presentation
ISO 129-1, Technical drawings — Indication of dimensions and tolerances — Part 1: General principles
ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation
ISO 3098-2, Technical product documentation — Lettering — Part 2: Latin alphabet, numerals and marks
ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers
ISO/TR 25901:2007, Welding and related processes — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/TR 25901 and the following apply.
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SIST EN ISO 2553:2014
ISO 2553:2013(E)

3.1
welding symbol
symbol consisting of an arrow line and a reference line and which may also include elementary and
supplementary symbols, dimensions and/or tail, used on technical drawings to indicate welded joint
type, location and joint preparation
Note 1 to entry: See Clause 4.
3.2
basic welding symbol
symbol consisting of an arrow line, reference line and tail used when the joint is not specified and only
to indicate that a welded joint is to be made
Note 1 to entry: See 4.2.
3.3
arrow line
leader line used to indicate the joint that is to be welded generally drawn at 135° to the reference line
Note 1 to entry: See 4.6.
3.4
reference line
part of the welding symbol on which the elementary symbol is located, generally drawn parallel to the
bottom edge of the drawing
Note 1 to entry: See 4.7.
3.5
tail
V shaped element added to the end of the continuous reference line away from the arrow line
Note 1 to entry: See 4.8.
3.6
arrow side
side of the joint to which the arrow line is pointing
Note 1 to entry: See 4.7.2.1.
3.7
other side
opposite side of the joint to the arrow side
Note 1 to entry: See 4.7.2.1.
3.8
elementary symbol
symbol forming part of the welding symbol and drawn on the reference line to indicate the type of weld
and joint preparation
Note 1 to entry: See 4.4.
3.9
supplementary symbol
symbol used in conjunction with elementary symbols to convey additional information about the joint
Note 1 to entry: See 4.5.
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SIST EN ISO 2553:2014
ISO 2553:2013(E)

3.10
complementary information
non-symbolic information, relevant to the welds being made, which may be included in the tail of the
welding symbol
Note 1 to entry: See 4.8.
3.11
intermittent weld
series of weld elements made at intervals along a joint
[SOURCE: ISO/TR 25901:2007]
Note 1 to entry: See 5.3.2.
3.11.1
chain intermittent weld
intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the
welds lie opposite one another along the joint
Note 1 to entry: See 5.3.2.2.
3.11.2
staggered intermittent weld
intermittent weld on each side of a joint (usually fillet welds in T and lap joints) arranged so that the
welds on one side lie opposite to the spaces on the other side along the joint
Note 1 to entry: See 5.3.2.3.
3.12
offset
distance between the start of welding on one side of a staggered intermittent weld made on both sides
of the joint and the start of welding on the other side
Note 1 to entry: See 5.3.2.3, Table 3 and Table 5, No 2.6.
3.13
back run
final run deposited on the root side of a fusion weld
3.14
backing weld
backing in the form of a weld
3.15
nominal weld length
design length of a weld
3.15.1
nominal length of weld elements
in intermittent welds, the design length of the elements of the weld
3.16
nominal throat thickness
a
design value of the height of the largest isosceles triangle that can be inscribed in the section of a fillet weld
Note 1 to entry: Other design throat thicknesses may be used, but need to be specified.
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SIST EN ISO 2553:2014
ISO 2553:2013(E)

3.17
leg length
z
distance from the actual or projected intersection of the fusion faces and the toe of a fillet weld, measured
across the fusion face
3.18
penetration depth
thickness of the weld metal excluding any reinforcement
3.19
deep penetration throat thickness
s
nominal or effective throat thickness to which a certain amount of fusion penetration is added
3.20
flare-bevel weld
butt weld between a joint member with a curved surface and another with a planar surface
Note 1 to entry: See Table 5.
3.21
flare-V weld
butt weld between two members with curved surfaces
Note 1 to entry: See Table 5.
3.22
field weld
weld made outside workshops usually at the place of final installation
4 Welding symbol
4.1 General
A reference line and arrow line are required elements. Additional elements may be included to convey
specific information.
It is preferable that the welding symbol is shown on the same side of the joint that the weld is to be made,
i.e. the arrow side (see 4.6).
The thickness of the arrow lines, reference line, elementary symbols and lettering shall be in accordance
with ISO 128 and ISO 3098-2.
In order not to overburden drawings, reference should be made to notes in the drawing or other design-
related documents.
4.2 Basic welding symbol
If joint details are not specified and the only requirement is to indicate that a joint is to be welded, the
basic symbol shown in Figure 1 may be used. In this case, a dual reference line is not required for system
A (see 4.6.1A) as no details concerning the weld are being conveyed.
The basic welding symbol shall comprise an arrow line, reference line and a tail.
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SIST EN ISO 2553:2014
ISO 2553:2013(E)

Key
1 arrow line
2 reference line
3 tail
NOTE This symbol is often used to indicate the location of tack welds.
Figure 1 — Basic welding symbol (joint details and type not specified)
4.3 Welding symbol systems
This International standard recognizes two different systems, A and B, to designate the arrow side and
other side on drawings.
The symbolic representation in system A is based on a dual reference line consisting of a continuous line
and a dashed line (see 4.7).
The symbolic representation in system B is based on a single reference line (see 4.7).
Clauses, Tables and Figures which carry the suffix “A” or “B” are applicable only to system A or system
B respectively.
Clauses, tables and figures which do not have a suffix are applicable to both systems.
System A and B shall not be mixed and drawings shall clearly indicate which system is used including
units of measurement in accordance with ISO 129-1.
Examples of comprehensive welding symbols showing the location of elements are given in Figure A.1.
4.4 Elementary symbols
4.4.1 General
Elementary symbols, in accordance with Table 1, can be added to the reference line in both systems A
and B to indicate the type of weld to be made.
Elementary symbols form part of the welding symbol and shall be drawn attached to the reference line
generally at the mid-point.
Elementary symbols may be complemented by:
— supplementary symbols (see 4.5 and Table 3);
— dimensions (see Clause 5);
— complementary information.
The orientation of the elementary symbols shall not be changed to that shown.
Annex B gives guidance on tolerances and transition points for butt welds, edge welds and fillet welds.
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SIST EN ISO 2553:2014
ISO 2553:2013(E)

If clear illustration by means of symbols is not possible, cross sections of the welds may be drawn
and dimensioned.
Table 1 — Elementary symbols
a
No. Designation Illustration Symbol
(dashed lines show joint preparation prior to welding)
b
1 Square butt
b
2 Single-V butt
Single-V butt with
3
b
broad root face
b
4 Single-bevel butt
Single-bevel butt
5 with broad root
b
face
b
6 Single-U butt
b
7 Single-J butt
8 Flare V
9 Flare bevel
a
The grey line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds are full penetration unless otherwise indicated by dimensions on the welding symbol or by reference to
other information, for example the WPS.
c
May be used for joints with more than 2 members.
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SIST EN ISO 2553:2014
ISO 2553:2013(E)

Table 1 (continued)
a
No. Designation Illustration Symbol
(dashed lines show joint preparation prior to welding)
10 Fillet
Plug (in slots or
11
circular holes)
Resistance spot
(including projec-
12
tion welding in
system A)
Fusion spot (and
13 projection welding
in system B)
14 Resistance seam
15 Fusion seam
16 Stud
Steep-flanked
17
b
single-V butt
Steep-flanked
18
b
single-bevel butt
a
The grey line is not part of the symbol. It indicates the position of the reference line.
b
Butt welds are full penetration unless otherwise indicated by dimensions on the welding symbol or by reference to
other information, for example the WPS.
c
May be used for
...