ISO 13920 (1996).pdf

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

Licensed to Jord International Pty Ltd on 12 Sep 2006. 1 user personal user licence only. Storage, distribution or use on network prohibited.

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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Copyright ISO

www.isostandards.com.au

IS0 13920: 1996(E)


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


Copyright ISO


IS0 13920:1996(E)

0 IS0

Content page

Foreword

*.ooooooo*ooooooomoooooooooooooooooooooo*oOoeoooooooooooooo

Scope

references

Definitions


1

oo*oooooooooooOooooOOOoOoooooOOooOOoeOOoOoOOOooOOOoOO****

Normatlve

1

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2

OOOOOOoOOOOoOOoOOOOoOoOOOOOoO~OOOOOOOooOooOOOOoooo*

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

OOOoOOOOOOOOOOOOOOOOOOOOOOOOOooooOOmOOoooo.

flatness on drawings

dimensions

l

dimensions

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l

~OOOO~OOOOOOOOOOOOOO~OOO~~OO

and parallelbm l

tolerances

l

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... III


Copyright ISO


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”.


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.


Copyright ISO


@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.


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

-


drawings

- Fundamental

Copyright ISO

and 0,05 ml

tolerancing

principle


IS0 13920: 1996(E)

3

Definitions

For the apply-

4

purposes

General

4.1

this

standard

the

definitions

for

1inear

Over 30

2 to

Tolerance Licensed to Jord International Pty Ltd on 12 Sep 2006. 1 user personal user licence only. Storage, distribution or use on network prohibited.

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


Copyright ISO

angle

leg,

f

1, is represented.


@ 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


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

3 www.standards.com.au

Copyright ISO


IS0 13920:1996(E)

I

Reference point t’ Figure 5.


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-

4 www.standards.com.au

Copyright ISO


@ IS0

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;


- 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


/-

Edge of weldment

6: Straightness

h max

- hmin

s

t

test

Copyright ISO


@IS0

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


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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may



This page intentionally

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@ IS0


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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ISO 13920 (1996).pdf

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