EN ISO 2553:2013

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

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.

Contents Page
Foreword .3

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.
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
ISO 2553:2013(E)
© 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
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Tel. + 41 22 749 01 11
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Published in Switzerland
ii © ISO 2013 – All rights reserved

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
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

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.
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.
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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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.
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.
4 © ISO 2013 – All rights reserved

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.
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
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.
6 © ISO 2013 – All rights reserved

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
circular holes)
Resistance spot
(including projec-
tion welding in
system A)
Fusion spot (and
13 projection welding
in system B)
14 Resistance seam
15 Fusion seam
16 Stud
Steep-flanked
b
single-V butt
Steep-flanked
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 joints with more than 2 members.
ISO 2553:2013(E)
Table 1 (continued)
a
No. Designation Illustration Symbol
(dashed lines show joint preparation prior to welding)
c
19 Edge
Flanged butt/cor-
ner weld
21 Overlay
c
22 Stake
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.
4.4.2 Combinations of elementary symbols
Elementary symbols may be combined as required to represent particular weld configurations.
4.4.3 Double-sided butt welds
The elementary symbols shall be arranged opposite each other on the reference line, including all
required information, when used to represent symmetrical welds.
In the case of symmetrical double-sided welds with identical symbols and dimensions, the dashed
reference line should be deleted for system A (see Table 2).
An example of an asymmetrical double-sided weld is shown in Table A.3.
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ISO 2553:2013(E)
Table 2 — Combined elementary symbols to represent double-sided welds
a b
No. Weld type Illustration of weld Symbol
1 Double-V butt
2 Double bevel butt
3 Double-U butt
Double bevel butt (with
4 broad root face) and
fillet welds
a
Welds may be partial or full penetration which is to be indicated by dimensions on the welding symbol (see Table 5) or
by reference to other information, for example the WPS.
b
The grey line is not part of the symbol. It indicates the position of the reference line.
4.5 Supplementary symbols
4.5.1 General
Additional information concerning the required joint may be provided by the use of supplementary
symbols in accordance with Table 3. Supplementary symbols can, for example, provide information
about the shape of the weld or how the welded joint shall be made.
ISO 2553:2013(E)
Table 3 — Supplementary symbols
a a
No. Designation Symbol Application example Illustration of weld
Flat-finished
b
flush
b
2 Convex
b
3 Concave
Toes blended
4 No example
c
smoothly
d
a) Back run
(made after the
single-V butt
weld)
d
b) Backing weld
(made before
the single-V butt
weld)
Specified root
6 reinforcement
e
(butt welds)
Backing (unspeci-
7a
fied)
Permanent back-
7b
f
ing
Removable/tem-
7c
f
porary backing
8 Spacer
a
The grey line is not part of the symbol and is included to show the position of symbol on reference line and/or the arrow
line only.
b
Welds that require approximately flush or convex faces without post weld finishing are specified by use of the flush or
convex contour symbol.
Welds to be finished flush or convex by post weld finishing or that require a flat but not flush surface require additional
information, e.g. addition of a note in the tail of the welding symbol
Other symbols in accordance with ISO 1302 may be used to specify surface finish.
c
The toes shall be blended smoothly by welding or finishing. Processing details may be specified in the work instructions
or WPS.
d
The weld run sequence may be indicated on the drawing e.g. by use of multiple reference lines, a note in the tail or by
reference to a weld procedure specification.
e
In system B, also used to designate flanged butt/corner welds (see 4.5.5.6)
f
M = material to be part of the final welded joint, MR = material to be removed after welding. Further information on the
material can be included in the tail or elsewhere.
g
Explanations of a, z, n, l and (e) are given in Clause 5.
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ISO 2553:2013(E)
Table 3 (continued)
a a
No. Designation Symbol Application example Illustration of weld
a) Joint showing insert in place
Consumable
insert
b) Welded joint showing root
bead (insert incorporated into
root). Single V but weld not
shown
Example A
10 Weld all-around
Example B
Example C
a
The grey line is not part of the symbol and is included to show the position of symbol on reference line and/or the arrow
line only.
b
Welds that require approximately flush or convex faces without post weld finishing are specified by use of the flush or
convex contour symbol.
Welds to be finished flush or convex by post weld finishing or that require a flat but not flush surface require additional
information, e.g. addition of a note in the tail of the welding symbol
Other symbols in accordance with ISO 1302 may be used to specify surface finish.
c
The toes shall be blended smoothly by welding or finishing. Processing details may be specified in the work instructions
or WPS.
d
The weld run sequence may be indicated on the drawing e.g. by use of multiple reference lines, a note in the tail or by
reference to a weld procedure specification.
e
In system B, also used to designate flanged butt/corner welds (see 4.5.5.6)
f
M = material to be part of the final welded joint, MR = material to be removed after welding. Further information on the
material can be included in the tail or elsewhere.
g
Explanations of a, z, n, l and (e) are given in Clause 5.
ISO 2553:2013(E)
Table 3 (continued)
a a
No. Designation Symbol Application example Illustration of weld
Weld between
two points
12 Field weld No example
Staggered inter-
Or
g
mittent welds
a
The grey line is not part of the symbol and is included to show the position of symbol on reference line and/or the arrow
line only.
b
Welds that require approximately flush or convex faces without post weld finishing are specified by use of the flush or
convex contour symbol.
Welds to be finished flush or convex by post weld finishing or that require a flat but not flush surface require additional
information, e.g. addition of a note in the tail of the welding symbol
Other symbols in accordance with ISO 1302 may be used to specify surface finish.
c
The toes shall be blended smoothly by welding or finishing. Processing details may be specified in the work instructions
or WPS.
d
The weld run sequence may be indicated on the drawing e.g. by use of multiple reference lines, a note in the tail or by
reference to a weld procedure specification.
e
In system B, also used to designate flanged butt/corner welds (see 4.5.5.6)
f
M = material to be part of the final welded joint, MR = material to be removed after welding. Further information on the
material can be included in the tail or elsewhere.
g
Explanations of a, z, n, l and (e) are given in Clause 5.
4.5.2 Weld all-around symbol
The weld all-around symbol, added at the junction of the arrow and reference lines, may be used to designate
a continuous weld, single or double-sided, extending around a series of connected joints (see Table 3).
The series of joints may involve different directions and may lie in more than one plane but the weld
shall always be of the same type and dimensions.
The weld all-around symbol shall not be used if:
a) the weld does not start and end at the same point, i.e. it is not continuous;
b) the weld type changes, for example from a fillet weld to a butt weld;
c) the dimensions change, for example the nominal throat thickness of a fillet weld. In this case, each
weld shall be identified using a separate welding symbol;
NOTE The weld all-around symbol is not used to indicate that welds are to be made everywhere.
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ISO 2553:2013(E)
Welds extending around the circumference of a circular section/hole or slot do not require the use of the
weld all-around symbol to specify a continuous weld.
4.5.3 Welds of the same type made from point to point
The weld between two points symbol may be used to designate a continuous weld, of the same type,
extending between two points. In this case, the weld does not start and stop at the same point, and
the weld all around symbol shall not be used (see Table 3). The end points of the weld shall be clearly
indicated and the welding symbol shall clearly indicate the joint to be welded.
Figure 2 gives an example of how a continuous weld extending around a series of connected points but
where the weld does not start and end at the same point, can be designated by one welding symbol.
Key
1 welding symbol
2 visual response (welded in accordance with the welding symbol)
A, B weld end positions
There is no weld from point B to point A (fillet weld not possible).
Any identifier may be used to identify the points between welds e.g. A, B and X, Y etc.
Figure 2 — Example of a welding symbol for a fillet weld made between two points A and B
4.5.4 Field welds
Field welds shall be specified by adding the field weld symbol at the junction of the arrow and reference
lines (see Table 3). The symbol shall be placed perpendicularly to and above the reference line. The
symbol applies to the whole welding symbol.
ISO 2553:2013(E)
4.5.5 Root reinforcement – butt welds made from one side
The root reinforcement symbol shall only be used when complete joint penetration plus a specified
minimum root reinforcement dimension is required in butt welds made from one side (see Figure 3).
The root reinforcement symbol shall be placed opposite the elementary symbol and on the other side of
the reference line.
a) System A welding symbol b) System B welding symbol
c) Weld produced using either system
Figure 3 — Example of a weld with specified root reinforcement
4.5.6 Welds on flanged butt and flanged corner joints
Welds on flanged butt and flanged corner joints shall be specified using the symbols shown in Table 4.
4.6 Arrow line
4.6.1 General
An arrow line shall be used to indicate the joint to be welded.
The arrow line shall:
— point to and shall be in contact with a solid line comprising part of the joint on the drawing (visible line);
— be drawn at an angle to and joined to a reference line and completed with a closed filled arrowhead.
The arrow line may be joined to either end of the reference line.
14 © ISO 2013 – All rights reserved

ISO 2553:2013(E)
Table 4 — Welds on flanged butt and flanged corner joints
No. Weld type System A welding symbol Illustration of weld System B welding symbol
FLANGED BUTT JOINTS
1 Edge
2 Flanged butt
FLANGED CORNER JOINTS
3 Edge
Flanged
corner
ISO 2553:2013(E)
4.6.2 Multiple arrow lines
Two or more arrow lines may be combined with a single reference line to indicate the locations of
identical welds (see Figure 4).
a) System A welding symbol b) System B welding symbol
c) Weld produced using either system
Figure 4 — Examples of use of multiple arrow lines
4.6.3 Broken arrow line
For butt welds in plates (excluding T-butt welds) when a specific joint member is required to be prepared
(e.g. single-bevel or single-J butt welds), the arrow line shall have a break and point toward that member.
The arrow line need not be broken if it is obvious or if there is no preference as to which member is
to be prepared.
Examples of the use of broken arrow lines are given in Table A.1.
4.7 Reference line and weld location
4.7.1 Reference line
The reference line when combined with elementary symbols, is used to indicate the side of the joint on
which the weld is to be made.
NOTE The reference line can be drawn parallel to the side edge of the drawing (whole welding symbol rotated
by 90°) but should only be done when space does not permit drawing parallel to the bottom edge.
16 © ISO 2013 – All rights reserved

ISO 2553:2013(E)
4.7.1A Reference line — System A: The refer- 4.7.1B Reference line — System B: The refer-
ence line consists of two parallel lines of equal ence line shall be drawn as a continuous line (see
length: a continuous line and a dashed line (see Examples in Annex A).
Examples in Annex A).
The dashed line may be drawn above or below
the continuous line but shall preferably be drawn
below.
The dashed line should be omitted for symmetri-
cal welds and for spot and seam welds made at
the interface between two components.
4.7.2 Weld location
4.7.2.1 Arrow side/Other side
The arrow side is the side of the joint to which the arrowhead is pointing (see Figure 5).
The other side is the opposite side of the joint to which the arrowhead is pointing. The arrow side and
other side always form part of the same joint.
The other side of a joint shall not be confused with a hidden weld forming part of a different joint.
Examples of how to designate welds on the arrow side and other side of joints are given in Table A.2.
4.7.2.1A Arrow side/Other side — Sys- 4.7.2.1B Arrow side/Other side — System
tem A: Elementary symbols shall be located on B: Elementary symbols shall be located below the
the continuous line when the weld is to be made reference line when the weld is to be made on the
on the arrow side of the joint. arrow side of the joint.
Elementary symbols shall be located on the Elementary symbols shall be located above the
dashed (identification) line when the weld is to reference line when the weld is to be made on the
be made on the other side of the joint. other side of the joint.
NOTE 1 In system A, the component of the reference line on which the elementary symbol is placed determines
the side of the joint which is to be welded - the dashed line can be drawn above or below the solid line.
NOTE 2 In system B, the position of the elementary symbol above or below the reference line determines the
side of the joint on which the weld is made
4.7.2.2 Plug, slot, spot, seam and projection welds
The arrow line shall point to and be in contact with the outer surface of one of the joint members, at the
centreline of the required weld.
In the case of welds made at the interface between two members, the elementary symbol shall be placed
centrally on the reference line (see Table A.2) and there is no arrow side/other side relevance. In this
case, the dashed reference line may be omitted from system A welding symbols.
4.7.2.2A Projection welds — System A: 4.7.2.2B Projection welds — System B:
The arrow line shall point to the sheet co
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