SIST EN ISO 2560:2006
(Main)Welding consumables - Covered electrodes for manual metal arc welding of non-alloy and fine grain steels - Classification (ISO 2560:2002)
Welding consumables - Covered electrodes for manual metal arc welding of non-alloy and fine grain steels - Classification (ISO 2560:2002)
This International Standard specifies requirements for classification of covered electrodes and deposited metal in the as-welded condition and in the post-weld heat-treated condition for manual metal arc welding of non-alloy and fine grain steels with a minimum yield strength of up to 500 N/mm 2 or a minimum tensile strength of up to 570 N/mm 2 . This International Standard is a combined specification providing for classification utilizing a system based upon the yield strength and the average impact energy of 47 J of all-weld metal, or utilizing a system based upon the tensile strength and the average impact energy of 27 J of all-weld metal. 1) Paragraphs and tables which carry the suffix letter "A" are applicable only to covered electrodes classified to the system based upon the yield strength and the average impact energy of 47 J of all-weld metal in this International Standard. 2) Paragraphs and tables which carry the suffix letter "B" are applicable only to covered electrodes classified to the system based upon the tensile strength and the average impact energy of 27 J of all-weld metal in this International Standard. 3) Paragraphs and tables which do not have either the suffix letter "A" or the suffix letter "B" are applicable to all covered electrodes classified in this International Standard.
Schweißzusätze - Umhüllte Stabelektroden zum Lichtbogenhandschweißen von unlegierten Stählen und Feinkornstählen - Einteilung (ISO 2560:2002)
Diese Internationale Norm legt Anforderungen fest zur Einteilung umhüllter Stabelektroden und des Schweiß-
gutes im Schweißzustand und nach einer Wärmenachbehandlung für das Lichtbogenhandschweißen von un-
legierten Stählen und von Feinkornstählen mit einer Mindeststreckgrenze bis zu 500 N/mm 2 oder mit einer
Mindestzugfestigkeit bis zu 570 N/mm 2 .
Diese Internationale Norm enthält eine gemeinsame Spezifikation zur Einteilung des reinen Schweißgutes
entweder nach der Streckgrenze und der durchschnittlichen Kerbschlagarbeit von 47 J oder nach der Zugfe-
stigkeit und der durchschnittlichen Kerbschlagarbeit von 27 J.
1) Abschnitte und Tabellen, gekennzeichnet durch ein nachgestelltes iaAlg, können nur für umhüllte Sta-
belektroden angewendet werden, die nach der Streckgrenze und der durchschnittlichen Kerbschlag-
arbeit von 47 J des reinen Schweißgutes in dieser Internationalen Norm eingeteilt werden.
2) Abschnitte und Tabellen, gekennzeichnet durch ein nachgestelltes iaBlg, können nur für umhüllte Sta-
belektroden angewendet werden, die nach der Zugfestigkeit und der durchschnittlichen Kerbschlag-
arbeit von 27 J des reinen Schweißgutes in dieser Internationalen Norm eingeteilt werden.
3) Abschnitte und Tabellen, die weder ein nachgestelltes iaAlg noch ioBlgenthalten, sind für alle nach die-
ser Internationalen Norm eingeteilten umhüllten Stabelektroden anwendbar.
Produits consommables pour le soudage - Electrodes enrobées pour le soudage manuel a l'arc des aciers non alliés et des aciers a grains fins - Classification (ISO 2560:2002)
Dodajni materiali za varjenje – Oplaščene elektrode za obločno varjenje nelegiranih in drobnozrnatih jekel – Razvrstitev (ISO 2560:2002)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 2560:2006
01-marec-2006
1DGRPHãþD
SIST EN 499:1995
'RGDMQLPDWHULDOL]DYDUMHQMH±2SODãþHQHHOHNWURGH]DREORþQRYDUMHQMH
QHOHJLUDQLKLQGUREQR]UQDWLKMHNHO±5D]YUVWLWHY ,62
Welding consumables - Covered electrodes for manual metal arc welding of non-alloy
and fine grain steels - Classification (ISO 2560:2002)
Schweißzusätze - Umhüllte Stabelektroden zum Lichtbogenhandschweißen von
unlegierten Stählen und Feinkornstählen - Einteilung (ISO 2560:2002)
Produits consommables pour le soudage - Electrodes enrobées pour le soudage manuel
a l'arc des aciers non alliés et des aciers a grains fins - Classification (ISO 2560:2002)
Ta slovenski standard je istoveten z: EN ISO 2560:2005
ICS:
25.160.20 Potrošni material pri varjenju Welding consumables
SIST EN ISO 2560:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 2560:2006
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SIST EN ISO 2560:2006
EUROPEAN STANDARD
EN ISO 2560
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2005
ICS 25.160.20 Supersedes EN 499:1994
English Version
Welding consumables - Covered electrodes for manual metal
arc welding of non-alloy and fine grain steels - Classification
(ISO 2560:2002)
Produits consommables pour le soudage - Electrodes Schweißzusätze - Umhüllte Stabelektroden zum
enrobées pour le soudage manuel à l'arc des aciers non Lichtbogenhandschweißen von unlegierten Stählen und
alliés et des aciers à grains fins - Classification (ISO Feinkornstählen - Einteilung (ISO 2560:2002)
2560:2002)
This European Standard was approved by CEN on 24 November 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2560:2005: E
worldwide for CEN national Members.
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SIST EN ISO 2560:2006
EN ISO 2560:2005 (E)
Foreword
The text of ISO 2560:2002 has been prepared by Technical Committee ISO/TC 44 "Welding and
allied processes" of the International Organization for Standardization (ISO) and has been taken
over as EN ISO 2560:2005 by 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 2006, and conflicting national
standards shall be withdrawn at the latest by June 2006.
This document supersedes EN 499:1994.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Endorsement notice
The text of ISO 2560:2002 has been approved by CEN as EN ISO 2560:2005 without any
modifications.
2
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SIST EN ISO 2560:2006
INTERNATIONAL ISO
STANDARD 2560
Second edition
2002-11-01
Welding consumables — Covered
electrodes for manual metal arc welding of
non-alloy and fine grain steels —
Classification
Produits consommables pour le soudage — Électrodes enrobées pour le
soudage manuel à l'arc des aciers non alliés et des aciers à grains fins —
Classification
Reference number
ISO 2560:2002(E)
©
ISO 2002
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
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ii © ISO 2002 – All rights reserved
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
Contents Page
Foreword . iv
Introduction. v
1 Scope. 1
2 Normative references. 1
3 Classification. 2
4 Symbols and requirements . 3
4.1 Symbol for the product/process. 3
4.2 Symbol for strength and elongation of all-weld metal . 3
4.3 Symbol for impact properties of all-weld metal . 4
4.4 Symbol for the chemical composition of all-weld metal . 4
4.5 Symbol for type of electrode covering. 5
4.6 Symbol for condition of post-weld heat-treatment of all-weld metal. 6
4.7 Symbol for nominal electrode efficiency and type of current . 7
4.8 Symbol for welding position . 7
4.9 Symbol for hydrogen content of deposited metal . 8
5 Mechanical tests. 8
5.1 Preheating and interpass temperatures . 8
5.2 Pass sequence. 11
6 Chemical analysis. 12
7 Fillet weld test. 14
8 Retest. 17
9 Technical delivery conditions. 17
10 Examples of designation. 18
Annex A (informative) Classification systems. 19
Annex B (informative) Description of types of electrode covering — Classification by yield strength
and 47 J impact energy. 22
Annex C (informative) Description of types of electrode covering — Classification by tensile strength
and 27 J impact energy. 24
Annex D (informative) Notes on diffusible hydrogen. 27
Bibliography. 28
© ISO 2002 – All rights reserved iii
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SIST EN ISO 2560:2006
ISO 2560:2002(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. 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.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 2560 was prepared in collaboration with the International Institute of Welding which has been approved by the
ISO Council as an international standardizing body in the field of welding.
This second edition cancels and replaces the first edition (ISO 2560:1973), which has been technically revised.
Annexes A to D of this International Standard are for information only.
iv © ISO 2002 – All rights reserved
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
Introduction
This International Standard recognizes that there are two somewhat different approaches in the global market to
classifying a given electrode, and allows for either or both to be used, to suit a particular market need. Application
of either type of classification designation (or of both where suitable) identifies a product as classified according to
this International Standard. The classification according to system A is mainly based on EN 499. The classification
according to system B is mainly based upon standards used around the Pacific Rim.
This International Standard provides a classification in order to designate covered electrodes in terms of the yield
strength, tensile strength and elongation of the all-weld metal. The ratio of yield to tensile strength of weld metal is
generally higher than that of parent metal. Users should note that matching weld metal yield strength to parent
metal yield strength will not necessarily ensure that the weld metal tensile strength matches that of the parent
metal. Therefore, where the application requires matching tensile strength, selection of the consumable should be
made by reference to column 3 of Table 1A or to Table 1B and Table 8B.
It should be noted that the mechanical properties of all-weld metal test specimens used to classify the electrodes
will vary from those obtained in production joints because of differences in welding procedure such as electrode
size, width of weave, welding position and parent metal composition.
Requests for official interpretation of any aspect of this International Standard should be directed to the Secretariat
of ISO/TC 44/SC 3 via the member body in the user's country, a complete listing of which can be found at
www.iso.org.
© ISO 2002 – All rights reserved v
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SIST EN ISO 2560:2006
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SIST EN ISO 2560:2006
INTERNATIONAL STANDARD ISO 2560:2002(E)
Welding consumables — Covered electrodes for manual metal arc
welding of non-alloy and fine grain steels — Classification
1 Scope
This International Standard specifies requirements for classification of covered electrodes and deposited metal in
the as-welded condition and in the post-weld heat-treated condition for manual metal arc welding of non-alloy and
2
fine grain steels with a minimum yield strength of up to 500 N/mm or a minimum tensile strength of up to
2
570 N/mm .
This International Standard is a combined specification providing for classification utilizing a system based upon the
yield strength and the average impact energy of 47 J of all-weld metal, or utilizing a system based upon the tensile
strength and the average impact energy of 27 J of all-weld metal.
1) Paragraphs and tables which carry the suffix letter “A” are applicable only to covered electrodes classified
to the system based upon the yield strength and the average impact energy of 47 J of all-weld metal in
this International Standard.
2) Paragraphs and tables which carry the suffix letter “B” are applicable only to covered electrodes classified
to the system based upon the tensile strength and the average impact energy of 27 J of all-weld metal in
this International Standard.
3) Paragraphs and tables which do not have either the suffix letter “A” or the suffix letter “B” are applicable to
all covered electrodes classified in this International Standard.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 31-0:1992, Quantities and units — Part 0: General principles
ISO 544, Welding consumables — Technical delivery conditions for welding filler metals — Type of product,
dimensions, tolerances and marking
ISO 2401, Covered electrodes — Determination of the efficiency, metal recovery and deposition coefficient
ISO 3690, Welding and allied processes — Determination of hydrogen content in ferritic steel arc weld metal
ISO 6847, Welding consumables — Deposition of a weld metal pad for chemical analysis
ISO 6947, Welds — Working positions — Definitions of angles of slope and rotation
ISO 13916, Welding — Guidance on the measurement of preheating temperature, interpass temperature and
preheat maintenance temperature
ISO 14344, Welding and allied processes — Flux and gas shielded electrical welding processes — Procurement
guidelines for consumables
© ISO 2002 – All rights reserved 1
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
ISO 15792-1:2000, Welding consumables — Test methods — Part 1: Test methods for all-weld metal test
specimens in steel, nickel and nickel alloys
ISO 15792-3:2000, Welding consumables — Test methods — Part 3: Classification testing of positional capacity
and root penetration of welding consumables in a fillet weld
3 Classification
Classification designations are based upon two approaches to indicate the tensile properties and the impact
properties of the all-weld metal obtained with a given electrode. The two designation approaches include additional
designators for some other classification requirements, but not all, as will be clear from the following sections. In
most cases, a given commercial product can be classified in both systems. Then either or both classification
designations can be used for the product.
The classification includes all-weld metal properties obtained with a covered electrode as given below. The
classification is based on the electrode size 4 mm with the exception of the symbol for welding position which is
based on ISO 15792-3.
3A Classification by yield strength and 47 J 3B Classification by tensile strength and
impact energy 27 J impact energy
The classification is divided into eight parts: The classification is divided into seven parts:
1) the first part gives a symbol indicating the 1) the first part gives a symbol indicating the
product/process to be identified; product/process to be identified;
2) the second part gives a symbol indicating the 2) the second part gives a symbol indicating the
strength and elongation of all-weld metal (see strength of all-weld metal (see Table 1B);
Table 1A);
3) the third part gives a symbol indicating the type of
3) the third part gives a symbol indicating the impact electrode covering, the type of current, and the
properties of all-weld metal (see Table 2A); welding position (see Table 4B);
4) the fourth part gives a symbol indicating the 4) the fourth part gives a symbol indicating the
chemical composition of all-weld metal (see chemical composition of all-weld metal (see
Table 3A); Table 3B);
5) the fifth part gives a symbol indicating the type of 5) the fifth part gives a symbol indicating the
electrode covering (see 4.5A); condition of postweld heat treatment under which
the all-weld metal test was conducted (see 4.6B);
6) the sixth part gives a symbol indicating the
nominal electrode efficiency and type of current 6) the sixth part gives a symbol indicating that the
(see Table 5A); electrode has satisfied a requirement for 47 J
impact energy at the temperature normally used
7) the seventh part gives a symbol indicating the
for the 27 J requirement;
welding position (see Table 6A);
7) the seventh part gives a symbol indicating the
8) the eighth part gives a symbol indicating the
hydrogen content of deposited metal (see
hydrogen content of deposited metal (see
Table 7).
Table 7).
In order to promote the use of this International In order to promote the use of this International
Standard, the classification is split into two sections: Standard, the classification is split into two sections:
a) Compulsory section a) Compulsory section
This section includes the symbols for the type of This section includes the symbols for the type of
product, the strength and elongation, the impact product, the strength, the type of covering, the
properties, the chemical composition and the type of current, the welding position, the chemical
type of covering, i.e. the symbols defined in 4.1, composition and the condition of heat treatment,
4.2A, 4.3A, 4.4A and 4.5A. i.e., the symbols defined in 4.1, 4.2B, 4.4B, 4.5B
and 4.6B.
2 © ISO 2002 – All rights reserved
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
b) Optional section b) Optional section
This section includes the symbols for the nominal This section includes the symbol for the optional
electrode efficiency, the type of current, the supplemental designator for 47 J impact energy,
welding positions for which the electrode is i.e., the symbol defined in 4.3B; and the symbol
suitable, and the symbol for hydrogen content, for the hydrogen content, i.e., the symbol defined
i.e. the symbols defined in 4.7A, 4.8A and 4.9. in 4.9.
The full designation (see clause 10) shall be used on packages and in the manufacturer's literature and data
sheets. See Figure A.1, for a schematic representation of the full designation of electrodes classified by yield
strength and 47 J impact energy, system A. See Figure A.2, for a schematic representation of the full designation of
electrodes classified by tensile strength and 27 J impact energy.
4 Symbols and requirements
4.1 Symbol for the product/process
The symbol for the covered electrode used in the manual metal arc welding process shall be the letter E placed at
the beginning of the designation.
4.2 Symbol for strength and elongation of all-weld metal
4.2A Classification by yield strength and 47 J 4.2B Classification by tensile strength and 27 J
impact energy impact energy
The symbols in Table 1A indicate yield strength, The symbols in Table 1B indicate tensile strength of
tensile strength and elongation of the all-weld metal in the all-weld metal in the as-welded condition or in the
the as-welded condition determined in accordance post-weld heat-treated condition determined in
with clause 5. accordance with clause 5. The yield strength and
elongation requirements depend upon the specific
chemical composition, heat treatment condition and
coating type, as well as upon the tensile strength
requirements, as given for the complete classification
in Table 8B.
Table 1A — Symbol for strength and elongation of Table 1B — Symbol for strength of all-weld metal
all-weld metal (Classification by yield strength and (Classification by tensile strength and 27 J impact
47 J impact energy) energy)
Minimum Tensile Minimum
b
yield strength elongation Minimum tensile strength
a
Symbol Symbol
strength
2
N/mm
2 2
N/mm N/mm %
35 355 440 to 570 22 43 430
38 380 470 to 600 20 49 490
42 420 500 to 640 20 55 550
46 460 530 to 680 20 57 570
50 500 560 to 720 18
a
For yield strength, the lower yield (R ) shall be used when
eL
yielding occurs, otherwise the 0,2 % proof strength (R ) shall be
p0,2
used.
b
Gauge length is equal to five times the specimen diameter.
© ISO 2002 – All rights reserved 3
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
4.3 Symbol for impact properties of all-weld metal
4.3A Classification by yield strength and 47 J 4.3B Classification by tensile strength and 27 J
impact energy impact energy
The symbols in Table 2A indicate the temperature at There is no specific symbol for impact properties. The
which an average impact energy of 47 J is achieved complete classification in Table 8B determines the
under the conditions given in clause 5. Three temperature at which an impact energy of 27 J is
specimens shall be tested. Only one individual value achieved in the as-welded condition or in the post-
may be lower than 47 J but not lower than 32 J. When weld heat-treated condition under the conditions given
an all-weld metal has been classified for a certain in clause 5. Five test specimens shall be tested. The
temperature, it automatically covers any higher lowest and highest values obtained shall be
temperature in Table 2A. disregarded. Two of the three remaining values shall
be greater than the specified 27 J level, one of the
three may be lower but shall not be less than 20 J.
Table 2A — Symbol for impact properties of all-
The average of the three remaining values shall be at
weld metal (Classification by yield strength and 47 J
least 27 J.
impact energy)
The addition of the optional symbol U, immediately
Temperature for minimum average
after the symbol for condition of heat treatment,
impact energy of 47 J
Symbol
indicates that the supplemental requirement of 47 J
°C
impact energy at the normal 27 J impact test
Z No requirement
temperature has also been satisfied. For the 47 J
impact requirement, three specimens shall be tested.
A + 20
The impact value shall be determined by the average
0 0
of the three test specimens. The average of the three
values shall be 47 J or greater.
2 − 20
3 − 30
4 − 40
5 − 50
6 − 60
4.4 Symbol for the chemical composition of all-weld metal
4.4A Classification by yield strength and 47 J 4.4B Classification by tensile strength and 27 J
impact energy impact energy
The symbols in Table 3A indicate the chemical The symbols in Table 3B indicate the principal alloying
composition of all-weld metal, determined in elements, and sometimes the nominal alloy level of the
accordance with clause 6. most significant alloy element, of all-weld metal,
determined in accordance with clause 6. The symbol
for chemical composition does not immediately follow
the symbol for strength, but follows the symbol for
coating type. The complete classification, given in
Table 10B, determines the exact chemical composition
requirements for a particular electrode classification.
4 © ISO 2002 – All rights reserved
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
Table 3A — Symbol for chemical composition of Table 3B — Symbol for chemical composition of
all-weld metal (Classification by yield strength and all-weld metal (Classification by tensile strength and
47 J impact energy) 27 J impact energy)
a, b, c
Chemical composition
Chemical composition (mass %)
Alloy Alloy
Principal alloy Nominal level
symbol symbol
Mn Mo Ni
element(s)
mass %
No symbol, -1,
No symbol 2,0 — — Mn 1
or -P1
Mo 1,4 0,3 to 0,6 — -1M3 Mo 0,5
Mn 1,5
MnMo 1,4 to 2,0 0,3 to 0,6 — -3M2
Mo 0,4
Mn 1,5
1Ni 1,4 — 0,6 to 1,2 -3M3
Mo 0,5
2Ni 1,4 — 1,8 to 2,6 -N1 Ni 0,5
3Ni 1,4 — 2,6 to 3,8 -N2 Ni 1
Mn1Ni 1,4 to 2,0 — 0,6 to 1,2 -N3 Ni 1,5
Mn 1,5
1NiMo 1,4 0,3 to 0,6 0,6 to 1,2 -3N3
Ni 1,5
Z Any other agreed composition -N5 Ni 2,5
a
If not specified, Mo < 0,2; Ni < 0,3; Cr < 0,2; V < 0,05;
-N7 Ni 3,5
Nb < 0,05; Cu < 0,3.
b
Single values shown in the table mean maximum values. -N13 Ni 6,5
c
The results shall be rounded to the same number of
Ni 1
-N2M3
significant figures as in the specified value using the rules
Mo 0,5
according to ISO 31-0:1992, Annex B, Rule A.
Ni 0,5
-NC
Cu 0,4
Cr 0,5
-CC
Cu 0,4
Ni 0,2
-NCC Cr 0,6
Cu 0,5
Ni 0,6
-NCC1 Cr 0,6
Cu 0,5
Ni 0,3
-NCC2 Cr 0,2
Cu 0,5
-G Any other agreed composition
4.5 Symbol for type of electrode covering
4.5A Classification by yield strength and 47 J 4.5B Classification by tensile strength and 27 J
impact energy impact energy
The type of covering of a covered electrode depends The type of covering of a covered electrode depends
substantially on the type of slag-forming components. substantially on the type of slag-forming components.
The symbols indicating the type shall be formed by The type of covering also determines the positions
the following letters or groups of letters: suitable for welding and the type of current, according
to Table 4B.
A = acid covering
C = cellulosic covering
R = rutile covering
RR = rutile thick covering
RC = rutile-cellulosic covering
RA = rutile-acid covering
RB = rutile-basic covering
B = basic covering.
NOTE A description of the characteristics of each of
the types of covering is given in annex B.
© ISO 2002 – All rights reserved 5
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SIST EN ISO 2560:2006
ISO 2560:2002(E)
Table 4B — Symbol for type of covering
(classification by tensile strength and 27 J impact
energy)
Type of Welding Type of
Symbol
a
cov
...
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