LICENCE for ISO 13920:1996 Welding - General tolerances for welded constructions Dimensions for lengths and angles - Shape and position
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IS0 13920
INTERNATIONAL STANDARD
First edition 1996-08-o 1
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Welding - General tolerances for welded constructions - Dimensions for lengths and angles - Shape and position Soudage - Tolkrances g&Wales relatives aux constructions Dimensions des longueurs et angles - Formes et positions
soudhes -
Reference number IS0 13920: 1996(E)
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IS0 13920: 1996(E)
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Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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 nongovernmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 13920 was prepared by the European Committee for Standardization (CEN) in collaboration with IS0 Technical Committee TC 44, Welding and allied processes, Subcommittee SC IO, Unification of requirements in the field of metal welding, in accordance with the Agreement on technical cooperation between IS0 and CEN (Vienna Agreement).
0
IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland central @ isocs.iso.ch Internet c=ch; a=400net; p=iso; o=isocs; s=central x.400 Printed in Switzerland
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IS0 13920:1996(E)
0 IS0
Content page
Foreword
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Scope
references
Definitions
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1
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Normatlve
1
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2
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4
General
tolerances
4.1
Tolerances
for
1 inear
4.2
Tolerances
for
angular
4.3
Straightness,
5
Indications
6
Testing
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6 01
General
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620
Straightness
630
Flatness
640
Parallelism
7
Non-conformities
l
iv
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flatness on drawings
dimensions
l
dimensions
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and parallelbm l
tolerances
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IS0 13920:1996(E)
@ IS0
Foreword The text of EN IS0 13920:1996 has been prepared by Technical Committee CEN/TC 121 “Welding”, the secretariat of which is held by DS, in collaboration with Technical Committee ISO/TC 44 “Welding and allied processes”.
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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 February 1997, and conflicting national standards shall be withdrawn at the latest by February 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
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@IS0
3920: 1996(E)
1 scope This European Standard specifies general tolerances for linear and angl lar dimensions and for shape and position of welded structures in four tolerance classes, these being based on customary workshop accuracy. The main criterion for the selection of a particular tolerance class should be the functional requirements which are to be met. The applicable tolerances are always those which are stated in the drawing. Instead of specifying individual tolerances the tolerance classes according this standard may be used. General tolerances for linear as specified in this standard structures etc.
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Special
provisions
to
and angular dimensions and for shape and position apply for weldments, welding assemblies and welded
may be necessary
for
complex structures.
The specifications given in this standard are based on the principle of independency as specified in IS0 8015, according to which the dimensional and geometrical tolerances apply independently of each other. Manufacturing documentation in which linear and angular dimensions or indications for shape and position are presented without individually indicated tolerances shall be deemed incomplete if there is no, or inadequate, reference to This does not apply to temporary dimensions. general tolerances. 2
Normative
references
by dated or undated reference, provisions Standard incorporates This European These normative references are cited at the appropriate from other publications. For dated place in the text and the publications are listed hereafter. to or revisions of any of these publications subsequent amendments references, apply to this European Standard only when incorporated in it by amendment or For undated references the last edition of the publication referred to revision. applies.
Geometrical Product Specifications (GPS) - Dimensional measuring instruments; Dial gauges - Design and metrological requirements
ISO/DIS 463
Technical drawings - Geometrical tolerant ng Tolerances of form, orientation, location and run-out - Generalities, definitions, symbols, indications on draw ngs (ISO/DIS 1101:1995)
prEN IS0 1101
Vernier
callipers
reading
to 0,l
IS0 6906
Vernier
callipers
reading
to 0,02 mn
IS0 8015
Technical
IS0 3599
-
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drawings
- Fundamental
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and 0,05 ml
tolerancing
principle
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IS0 13920: 1996(E)
3
Definitions
For the apply-
4
purposes
General
4.1
this
standard
the
definitions
for
1inear
Over 30
2 to
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IS0
1101
1. for
Range of nominal
I
up to
30
I
120
Over 120
up to
I 400
Over 1000
Over 400
I 1000
I 2000
A 1
1
dimensions In mm.
Over 2000
up to
up to
linear
sizes
Over 4000
up to
I
Tolerances
.
prEN
dimensions
Table 1: Tolerances
I cl ass
of
tolerance-s
Tolerances
See table
of
4000 t
up to
I
8000
Over 8000
Over 12000
Over 16000
12000
16000
20000
up to
I
up to
Over 20000
up to
I
I
in nm
kl
il
i2
i3
k4
*5
k6
i7
i2
i2
k3
f4
f6
i8
f 10
f 12
f 14
f 16
23
i4
f6
i8
f 11
f 14
f 18
f 21
f 24
f 27
f 32
f 36
f 40
I k8
t9
r
8 kl C II 0
4.2
4
r k4
Tolerances
for
k7
angular
i9
f 12
f 16
f 21
f 27
d imensions
The length of the shorter ang le leg shall be used to determine in accordance with table 2 which tolerances are to apply. The length of the leg may also be assumed to extend to a specif ied reference point. In this case, the reference point concerned shall be indicated on the drawing. See table Figures
2 for
the relevant
tolerances.
1 to 5 show examples of how the shorter
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angle
leg,
f
1, is represented.
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@ IS0
IS0 13920:1996(E)
Table 2: Tolerances
for angular
dimensions
Range of nominal sizes (length or shorter up t-o 400
To1 erance class
1 in 11171 leg)
Over 400 up to 1000
Over 1000
I
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Tolerances
Aa (in degrees and minutes)
f 20’
f 15'
f 10’
f 45’
t 30’
f 20’
f lo
f 45’
f 30’
f lO30'
f lO15'
f 10
Calculated tolerances
and rounded t, in m/ml)
A
k6
f 4,5
k3
B
f 13
*9
k6
C
f 18
f 13
*9
D
f 26
f 22
f 18
l) The value indicated in mn/m corresponds to the tangent value of the general tolerance. It is to be multiplied in m, of the shorter leg. by the length, Reference point
Reference point
Figum 1
I Reference point
Figun 2
Figun 3
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IS0 13920:1996(E)
I
Reference point t’ Figure 5.
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Figure 4.
4.3
Straightness,
flatness
and parallelism
tolerances
flatness and parallelism tolerances as specified in the folloThe straightness, wing table 3 apply both for the overall dimensions of a weldment, a welding assembly, or a welded structure, and also for sections for which the dimensions are indicated. Other tolerances of form and position, e.g. have not been specified. If such tolerances Con,
they
shall
be indicated
on the
Table 3: Straightness,
Range of nominal Tolerance class
sires
1 'In
coaxial ity and symmetry tolerances, are required for reasons of func-
drawings
flatness
mm- (relates
as specified
and parallelism
to longer
side
of the
in
prep
ISO
tolerances
surface)
Over
over
Over
Over
over
Over
Over
Over
Over
UP to 120
UP to
UP to
UP to
UP to
UP to
UP to
UP to
UP to
30
120
400
400
1000
1000
2000
2000
4000
4000 Tolerances
8000 t
8000
1101.
12000
Over
16000
12000
16000
20000
5
6
7
20000
in mn' ,
1 E
095
1
1,5
2
3
4
8 I
F
1
1,5
3
4,5
6
8
10
12
14
16 I
L G
195
3
5,5
9
11
16
20
22
25
25 1
, H
2,5
5
9
14
18
26
32
36
40
40 I
t-
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5 4
IS0 13920: 1996(E)
Indications
on drawings
The designation of the selected tolerance class as specified in table 1 and table 2 (e.g. EN IS0 139204) or its combination with a tolerance class as specified in table 3 (e.g. EN IS0 13920.BE), shall be entered in the appropriate area on the drawing. 6
Testing
6.1
General
Testing and measuring purpose. - graduated
steel
devices
used shall
be suitable
and accurate
for
their
intended
straightedges;
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- tape measures; - straightedges; - squares; -
verriier
-
dial
callipers gauges
Other testing The results temperature light.
(in
(in
accordance
accordance
and measuring
with
devices
with
IS0
ISO/DIS
1599
and
Is0
6906);
463).
may be used by agreement.
of measurement may be influenced or atmospheric conditions, e.g.
if they are obtained under unusual large constructions in strong sun-
The actual size of an angle shall be determined by applying suitable measuring infludevices tangentially to the weldment, but away from the zone imnediately enced by the weld. The deviation shall be derived from the difference between the nominal size and the actual size. The angular deviation may be measured in degrees and minutes, or in millimetres. 6.2
Straightness
The edge of the weldment and the straightedge shall be aligned in such a way that the greatest distance between the straightedge and the actual surface is at shall be its minirnun:. The distance between the edge and the straightedge measured (example see figure 6).
.5 -t 1
Straightedge I
Figure
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/-
Edge of weldment
6: Straightness
h max
- hmin
s
t
test
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IS0 13920:1996(E)
6.3
Flatness
surface of the weldment and the measuring plane shall be aligned to in such a way that the greatest distance between the measuring plane and the actual surface is at its minimum. This may be effected, for example, tubular water levels, span wires, floor plates, with the aid of optical devices, and 'machine beds. surface plates, The actual each other
The distances between the actual measured (example see figure 7).
surface
and the measuring
plane
shall
be
plane
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h max
Figure 6.4
7: Flatness
- hm,”
<
t
test
Parallelism
The reference
surface
shall
be aligned
parallel
to the reference
plane.
A measuring plane shall be established parallel to the reference plane and apart from the weldment, using the measuring devices referred to in 6.3. The distances between the actual surface and the measuring plane shall be measured (example see figure a).
X suring pl ane
Actual surface
h max
e hmin
s
t
Reference surface - Reference plane
Figure 7
8: Parallelism
test
Non-conformities
A decision on the acceptance of components not complying with this standard be made on the basis of the suitability for their intended purpose.
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ISO13920:1996(E)
ICS 17.040.10;
25160.10
welding, welded construction, Descriptors: angular tolerances, tests.
shape,
position (location),
dimensions,
length,
angles (geometry),
dimensional
tolerances,
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