EN ISO 6848:2004
(Main)Arc welding and cutting - Nonconsumable tungsten electrodes - Classification (ISO 6848:2004)
Arc welding and cutting - Nonconsumable tungsten electrodes - Classification (ISO 6848:2004)
ISO 6848:2004 specifies requirements for classification of nonconsumable tungsten electrodes for inert gas shielded arc welding, and for plasma welding, cutting and thermal spraying.
Lichtbogenschweißen und -schneiden - Wolframelektrode - Einteilung (ISO 6848:2004)
Diese Internationale Norm legt die Anforderungen für die Einteilung von Wolframelektroden zum Metall-Inertgasschweißen und zum Plasmaschweißen und -schneiden sowie thermischen Spritzen fest.
Sondage et coupage à l'arc - Electrodes non consommables et tungstène - Classification (ISO 6848:2004)
L'ISO 6848:2004 spécifie les exigences relatives à la classification des électrodes en tungstène non consommables pour le soudage TIG (soudage à l'arc sous protection de gaz inerte), ainsi que pour le soudage, le coupage et la projection thermique au plasma.
Obločno varjenje in rezanje - Netaljive volframove elektrode - Razvrstitev (ISO 6848:2004)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2005
1DGRPHãþD
SIST EN 26848:1995
2EORþQRYDUMHQMHLQUH]DQMH1HWDOMLYHYROIUDPRYHHOHNWURGH5D]YUVWLWHY ,62
Arc welding and cutting - Nonconsumable tungsten electrodes - Classification (ISO
6848:2004)
Lichtbogenschweißen und -schneiden - Wolframelektrode - Einteilung (ISO 6848:2004)
Sondage et coupage a l'arc - Electrodes non consommables et tungstene - Classification
(ISO 6848:2004)
Ta slovenski standard je istoveten z: EN ISO 6848:2004
ICS:
25.160.20 Potrošni material pri varjenju Welding consumables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 6848
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 25.160.20 Supersedes EN 26848:1991
English version
Arc welding and cutting - Nonconsumable tungsten electrodes -
Classification (ISO 6848:2004)
Sondage et coupage à l'arc - Electrodes non
consommables et tungstène - Classification (ISO
6848:2004)
This European Standard was approved by CEN on 8 November 2004.
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
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6848:2004: E
worldwide for CEN national Members.
Foreword
This document (EN ISO 6848:2004) 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 2005, and conflicting national standards
shall be withdrawn at the latest by June 2005.
This document supersedes EN 26848:1991.
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 6848:2004 has been approved by CEN as EN ISO 6848:2004 without any
modifications.
INTERNATIONAL ISO
STANDARD 6848
Second edition
2004-12-01
Arc welding and cutting —
Nonconsumable tungsten electrodes —
Classification
Soudage et coupage à l'arc — Électrodes non consommables en
tungstène — Classification
Reference number
ISO 6848:2004(E)
©
ISO 2004
ISO 6848:2004(E)
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ii © ISO 2004 – All rights reserved
ISO 6848:2004(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 2.
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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 6848 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee
SC 3, Welding consumables.
This second edition cancels and replaces the first edition (ISO 6848:1984), which has been technically revised.
ISO 6848:2004(E)
Introduction
Tungsten electrodes are used in a variety of welding and allied processes, including tungsten inert gas
welding, plasma arc welding and cutting, plasma spraying, and atomic hydrogen welding. In contrast to most
other welding electrodes, tungsten electrodes are not intended to become part of the weld deposit.
Nevertheless, the chemical composition of a tungsten electrode has an important effect on its range of usage
in welding and allied processes. Therefore, tungsten electrodes are classified according to their chemical
composition.
Requests for official interpretations of any aspect of this International Standard should be directed to the
Secretariat of ISO/TC 44/SC 3 via your national standards body. A complete listing of national standards
bodies can be found at www.iso.org.
iv © ISO 2004 – All rights reserved
INTERNATIONAL STANDARD ISO 6848:2004(E)
Arc welding and cutting — Nonconsumable tungsten
electrodes — Classification
1 Scope
This International Standard specifies requirements for classification of nonconsumable tungsten electrodes for
inert gas shielded arc welding, and for plasma welding, cutting and thermal spraying.
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 31-0:1992, Quantities and units — Part 0: General principles
3 Classification
Classification of a tungsten electrode is based upon its chemical composition.
4 Symbols and requirements
4.1 Symbol for the product/process
The symbol for gas shielded tungsten arc processes is the letter W.
4.2 Symbol for the chemical composition
The symbol for the chemical composition of the tungsten electrode is the chemical symbol for the principal
oxide additive followed by digits indicating the nominal mass percent of the oxide additive multiplied by 10. If
there is no additive, the symbol is the letter P. Table 1 lists the composition requirements for the various
classifications. Compositions not listed in Table 1 shall be symbolized by the letters WG, followed by the
chemical symbol and digits for the major oxide additive, according to the principle used for the other
compositions given in Table 1.
5 Chemical analysis
Chemical analysis shall be performed on specimens of the electrode being classified. Any analytical technique
may be used but, in cases of dispute, reference shall be made to established published methods.
6 Retests
If any test fails to meet the requirement, that test shall be repeated twice. The results of both retests shall
meet the requirements. Specimens for retesting may be taken from the original test assembly or from a new
test assembly. For chemical analysis, retests need only be for those specific elements that failed to meet their
ISO 6848:2004(E)
test requirement. If the results of one or both retests fail to meet the requirement, the material under test shall
be considered as not meeting the requirements of this specification for that classification.
In the event that, during preparation or after completion of any test, it is clearly determined that prescribed or
proper procedures were not followed in preparing the weld test assembly or test specimen(s), or in conducting
the tests, the test shall be considered invalid, without regard to whether the test was actually completed, or
whether the test results met, or failed to meet, the requirement. That test shall be repeated, following proper
prescribed procedures. In this case, the requirement for doubling the number of test specimens does not
apply.
7 Marking
In accordance with Table 1, tungsten electrodes shall be marked on the basis of their chemical composition,
with one colour ring near one end of the electrode. The width of the colour ring shall be at least 3 mm.
Alternatively, tungsten electrodes may have their classification symbols marked on the surface of the
electrode near at least one end of the electrode.
Table 1 — Chemical composition requirements for tungsten electrodes
Chemical composition requirements
Colour code,
Classification
Oxide addition Impurities, Tungsten,
RGB colour value and
symbol
a
mass mass
colour sample
Principal oxide Mass percent
percent percent
Green
b
#008000
WP None N.A. 0,5 max. 99,5 min.
Grey
#808080
CeO
WCe 20 1,8 to 2,2 0,5 max. Balance
Black
#000000
La O
WLa 10 0,8 to 1,2 0,5 max. Balance
2 3
Gold
#FFD700
La O
WLa 15 1,3 to 1,7 0,5 max. Balance
2 3
Blue
#0000FF
WLa 20 La O 1,8 to 2,2 0,5 max. Balance
2 3
Yellow
#FFFF00
ThO
WTh 10 0,8 to 1,2 0,5 max. Balance
Red
#FF0000
ThO
WTh 20 1,7 to 2,2 0,5 max. Balance
2 © ISO 2004 – All rights reserved
ISO 6848:2004(E)
Table 1 (continued)
Chemical composition requirements
Colour code,
Classification
Oxide addition Impurities, Tungsten,
RGB colour value and
symbol
a
mass mass
colour sample
Principal oxide Mass percent
percent percent
Violet
#EE82EE
WTh 30 ThO 2,8 to 3,2 0,5 max. Balance
Brown
#A52A2A
ZrO
WZr 3 0,15 to 0,50 0,5 max. Balance
White
#FFFFFF
ZrO
WZr 8 0,7 to 0,9 0,5 max. Balance
a
RGB colour values and colour samples can be found at the following website:
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/reference/colors/colors.asp
b
N.A. = Not applicable.
8 Standard sizes and tolerances
8.1 Electrode diameters
Standard electrode diameters and tolerances are given in Table 2. Other diameters and tolerances may be as
agreed between supplier and purchaser.
ISO 6848:2004(E)
Table 2 — Standard electrode diameters and tolerances
Diameter Tolerance
mm mm
0,25
± 0,02
0,30 ± 0,02
0,50 ± 0,05
1,0 ± 0,05
1,5
± 0,05
1,6 ± 0,05
2,0
± 0,05
2,4 ± 0,1
2,5
± 0,1
3,0 ± 0,1
3,2
± 0,1
4,0 ± 0,1
4,8 ± 0,1
5,0 ± 0,1
6,3 ± 0,1
6,4 ± 0,1
8,0 ± 0,1
10,0 ± 0,1
8.2 Electrode lengths
Standard electrode lengths and tolerances are given in Table 3. Other lengths and tolerances may be as
agreed between supplier and purchaser.
Table 3 — Standard electrode lengths and tolerances
Length Tolerance
mm mm
50 ± 1,5
+ 2,5
− 1,0
+ 4
− 1
+ 6
− 1
+ 8
− 1
+ 8
− 1
+ 13
− 1
4 © ISO 2004 – All rights reserved
ISO 6848:2004(E)
8.3 Electrode straightness
Electrodes shall not deviate from straight by more than 0,5 mm over any 100 mm of length or less.
9 Rounding-off procedure
For purposes of determining compliance with the requirements of this International Standard, the actual test
values obtained shall be subjected to the rounding-off rules of ISO 31-0:1992, Annex B, Rule A. If the
measured values are obtained by equipment calibrated in units other than those of this International Standard,
the measured values shall be converted to the units of this International Standard before rounding off. If an
average value is to be comp
...
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