EN 1708-2:2018

SLOVENSKI STANDARD
01-marec-2019
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SIST EN 1708-2:2001
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Welding - Basic weld joint details in steel - Part 2: Non internal pressurized components
Schweißen - Verbindungselemente beim Schweißen von Stahl - Teil 2: Nicht
innendruckbeanspruchte Bauteile
Soudage - Descriptif de base des assemblages soudés en acier - Partie 2 : Composants
non soumis à une pression interne
Ta slovenski standard je istoveten z: EN 1708-2:2018
ICS:
25.160.40 Varjeni spoji in vari Welded joints and welds
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1708-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 25.160.40 Supersedes EN 1708-2:2000
English Version
Welding - Basic weld joint details in steel - Part 2: Non
internal pressurized components
Soudage - Descriptif de base des assemblages soudés Schweißen - Verbindungselemente beim Schweißen
en acier - Partie 2 : Composants non soumis à une von Stahl - Teil 2: Nicht innendruckbeanspruchte
pression interne Bauteile
This European Standard was approved by CEN on 28 September 2018.

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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1708-2:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Symbols and abbreviations . 5
5 Requirements . 6
5.1 Selection for detail . 6
5.2 Joint preparation . 6
5.2.1 General . 6
5.2.2 Joint preparation geometry . 6
5.2.3 Butt joints with significant difference of thickness . 6
5.2.4 Weld size . 7
5.3 Typical connections . 8
Bibliography . 26

European foreword
This document (EN 1708-2:2018) has been prepared by Technical Committee CEN/TC 121 “Welding
and allied processes”, 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 2019 and conflicting national standards shall be
withdrawn at the latest by June 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1708-2:2000.
The main changes compared to the previous edition are as follows:
a) the normative references and bibliography have been updated;
b) process numbers have been updated according to EN ISO 4063;
c) reference to EN ISO 9692-2 in Tables 2, 3, 4 und 5 has been deleted.
EN 1708, Welding — Basic welded joint details in steel is composed of the following parts:
— Part 1: Pressurized components;
— Part 2: Non internal pressurized components.
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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
1 Scope
The purpose of this document is to exemplify sound and accepted welded connections applicable to
welded not internal pressurized steel components. It does not promote the standardization of
connections that may be regarded as mandatory or restrict development in any way. The requirements
of carrying capacity, fitness for purposes, fatigue and corrosion stress will be considered if necessary.
This document contains examples of connections welded by the following processes (process numbers
according to EN ISO 4063):
— Manual metal arc welding (111);
— Self-shielded tubular-cored arc welding (114);
— Submerged arc welding (12);
— MIG welding; Metal inert gas welding with solid wire electrode (131);
— MAG welding; Metal active gas welding with solid wire electrode (135);
— Tubular cored metal arc welding with active gas shield (136);
— MAG welding; Metal active gas welding with metal cored electrode (138);
— MIG welding; Metal inert gas welding with flux cored electrode (132);
— MIG welding; Metal inert gas welding with metal cored electrode (133);
— TIG welding; Tungsten inert gas arc welding (14).
Other processes by agreement.
Further requirements will be considered in accordance with existing application standards.
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.
EN 1792, Welding - Multilingual list of terms for welding and related processes
EN ISO 2553, Welding and allied processes - Symbolic representation on drawings - Welded joints (ISO
2553)
EN ISO 9692-1, Welding and allied processes - Types of joint preparation - Part 1: Manual metal arc
welding, gas-shielded metal arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-
1)
EN ISO 9692-2, Welding and allied processes - Joint preparation - Part 2: Submerged arc welding of steels
(ISO 9692-2)
EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials - Welding
procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO
15614-1)
EN ISO 17659, Welding - Multilingual terms for welded joints with illustrations (ISO 17659)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
WPQR = welding procedure qualification record
a
= weld design throat thickness
b = root gap
B = width of profile or plate
c = distance to auxiliary attachment
d = size of bevel or diameter
D = distance of the stiffener and size of opening
F = load strength
g = width of weld in two flange plate
h = difference of thickness
i = distance of the opening and weld to the web
k = penetration depth and corner distance
l = length
m = size of mechanical beveling
R = radius
t = plate thickness
t = thickness of stacked flange end
R
z = leg length of the weld
α = included angle (i.e. angle of the slope)
δ = angle of T-joint
NOTE All dimensions in the following tables are guide values.
5 Requirements
5.1 Selection for detail
The connections recommended are not considered to be equally suitable for all service conditions, nor
is the order in which they are shown indicative of their relative characteristics. In selecting the
appropriate detail to use from the several alternatives shown for each type of connection, consideration
shall be given to the existing fabrication and service conditions that pertain.
5.2 Joint preparation
5.2.1 General
The limitations quoted in weld profiles and sizes are based on commonly accepted sound practice, but
they can be subjected to modifications if required by special welding techniques or design conditions.
The terminology and symbolization used in this standard follow EN 1792, EN ISO 17659 and
EN ISO 2553.
5.2.2 Joint preparation geometry
The recommended joint preparation geometry (e.g. included angles, root gaps, root radius and depth of
root faces) are given in EN ISO 9692-1 and in EN ISO 9692-2.
In cases where full penetration butt joints are indicated, it is intended that they shall be back chipped or
gouged and back welded, or alternatively that the welding procedure shall be such as to ensure sound
and effective root penetration.
5.2.3 Butt joints with significant difference of thickness
Depending on the type of load (type of action effect) and the difference of thickness, adjustment with
the weld or bevelling is necessary (see Table 1 and Figure 1) when the direction of strength is
perpendicular to the weld.
Table 1 — Guidelines for weld preparation on butt joints with significant difference of thickness
Type of load Difference of Adjustment with Angle of the Figures
a
thickness, h, the weld slope
(type of action effect)
mm
suggested not
permitted
Members with ≤ 10 X – – 1 a) and 1 b)
predominantly static loads
> 10 – X 20° ≤ α ≤ 45° 1 c) and 1 d)
Members significantly susceptible ≤ 3 X – – 1 b)
to fatigue or to risk of brittle
b
> 3 – X 10° ≤ α ≤ 30° 1 c) and 1 d)
fracture
Key: X = permitted; – = not permitted or not necessary
a
The angle of the slope depends on the actual acceptable notch case.
b
In case of low loaded components, α can be raised up to 45°.

a)
b)
c)
d)
Figure 1 — Sketches of adjustment on difference of thickness
5.2.4 Weld size
The thickness of welds (in particular of fillet welds), which are not determined by their profile, are
based on the assumption that the joint need not to be stronger than the connected parts.
Fillet welds for T-joints (see Figure 2) should respect the following condition (see Formulae (1) and
(2)):
3 mm ≤≤a 0,7 × t
(1)
NOTE 1 In special cases, the above limit of 0,7 x t can be exceeded.
a ≥− t 0,5 mm (2)
max.
NOTE 2 Only up to 30 mm plate thickness except for process 12 (submerged arc welding).
Figure 2 — Sketch of a T-joint
5.3 Typical connections
Typical connections are given in Table 2. For connections that not are mentioned (e.g. full penetration
joint), reference shall be made to EN ISO 9692-1 and EN ISO 9692-2.
Table 2 — Typical joint preparation
a
No. Figure Application/Condition Note
2.1 Weld thickness evaluation
2.1.1 Partial penetration welds If the leg length of the weld z is
specified, the weld throat can be
α ≤ 60°
assumed equal to a
without any other indication:
a = d
applicable to double side weld,
too
2.1.2
2.1.3 Design throat of fillet welds Measured from the theoretical
root point
a
No. Figure Application/Condition Note
2.1.4
2.1.5 Applicable only for fully
mechanized and automatic
processes and
a = a+ e
e to be settled by WPQR
according to EN ISO
...