SIST EN ISO 3690:2012
(Main)Welding and allied processes - Determination of hydrogen content in arc weld metal (ISO 3690:2012)
Welding and allied processes - Determination of hydrogen content in arc weld metal (ISO 3690:2012)
This Standard specifies the sampling and analytical procedure for the determination of diffusible and residual hydrogen in weld metal arising from the welding of ferritic steel using arc welding processes with filler metal.
Schweißen und verwandte Prozesse - Verfahren zur Bestimmung des Wasserstoffgehaltes im Lichtbogenschweißgut (ISO 3690:2012)
Diese Internationale Norm legt Anforderungen für das Verfahren der Prüfstückherstellung und der Analyse zur Bestimmung des diffusiblen und residuellen Wasserstoffs im Schweißgut martensitischer, bainitischer und ferritischer Stähle fest, das durch Lichtbogenschweißen mit Schweißzusatz hergestellt wurde.
Bei den in dieser Internationalen Norm beschriebenen Techniken wird diffusibler Wasserstoff zum einen mittels Quecksilberverdrängung, zum anderen in einem mit Inertgas, z. B. Argon, gefüllten Kopfraum auf-gefangen. Im ersten Fall wird die aufgefangene Wasserstoffmenge durch Messung des verdrängten Volumens bestimmt, im zweiten Fall durch Messung der Wärmeleitfähigkeit.
Die Temperatur wird beim Auffangen des diffusiblen Wasserstoffs kontrolliert, um eine thermische Aktivierung nicht diffusiblen Wasserstoffs zu vermeiden.
Darüber hinaus kann die Messung des diffusiblen Wasserstoffs durch Anwendung einer schnellen Methode (kurze Auffangzeit) bei höheren Temperaturen ausgeführt werden.
Soudage et techniques connexes - Détermination de la teneur en hydrogène dans le soudage à l'arc des métaux (ISO 3690:2012)
L'ISO 3690:2012 spécifie le mode opératoire d'échantillonnage et d'analyse pour la détermination de l'hydrogène diffusible dans le métal fondu en acier martensitique, bainitique et ferritique résultant du soudage de ces aciers avec des procédés de soudage à l'arc avec métal d'apport.
Les techniques spécifiées dans l'ISO 3690:2012 comprennent la collecte de l'hydrogène diffusible par déplacement de mercure ou la collecte dans un espace de tête rempli d'un gaz inerte, tel que l'argon. La quantité d'hydrogène collectée est déterminée en mesurant le volume déplacé pour la première technique et, par exemple, la conductivité thermique pour la seconde.
La température de collecte de l'hydrogène diffusible est régulée afin d'éviter l'activation thermique de l'hydrogène non diffusible.
Varjenje in sorodni postopki - Določevanje vodika v čistih varih pri obločnem varjenju (ISO 3690:2012)
Ta mednarodni standard opisuje, kako se lahko mednarodni standardi, ki obravnavajo ergonomijo fizikalnega okolja, uporabljajo za ljudi s posebnimi potrebami, ki bi bili sicer izključeni iz področja uporabe teh standardov. Pripravljen je v skladu z načeli dostopnega načrtovanja iz vodila ISO/IEC 71 in na podlagi podatkov iz ISO/TR 22411. Standard ni omejen na nobeno posebno okolje, ampak določa splošna načela, ki omogočajo oceno in vrednotenje, pri čemer lahko prispeva k razvoju standardov za posebna okolja. Uporablja se za grajeno okolje ter za druga notranja okolja, okolja v vozilu in zunanja okolja. Prav tako ni omejen na posebne okoljske elemente; vključuje oceno akustičnega okolja, temperaturnega okolja, osvetlitve, kakovosti zraka in drugih okoljskih dejavnikov, za katere se lahko šteje, da vplivajo na zdravje, udobje in delovanje oseb s posebnimi potrebami v posameznem okolju. Uporablja se za vse uporabnike takšnih okolij, za katere se šteje, da imajo posebne potrebe.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 3690:2012
01-julij-2012
1DGRPHãþD
SIST EN ISO 3690:2001
9DUMHQMHLQVRURGQLSRVWRSNL'RORþHYDQMHYRGLNDYþLVWLKYDULKSULREORþQHP
YDUMHQMX ,62
Welding and allied processes - Determination of hydrogen content in arc weld metal (ISO
3690:2012)
Schweißen und verwandte Prozesse - Verfahren zur Bestimmung des
Wasserstoffgehaltes im Lichtbogenschweißgut (ISO 3690:2012)
Soudage et techniques connexes - Détermination de la teneur en hydrogène dans le
soudage à l'arc des métaux (ISO 3690:2012)
Ta slovenski standard je istoveten z: EN ISO 3690:2012
ICS:
25.160.40 Varjeni spoji in vari Welded joints
SIST EN ISO 3690:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 3690:2012
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SIST EN ISO 3690:2012
EUROPEAN STANDARD
EN ISO 3690
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2012
ICS 25.160.40 Supersedes EN ISO 3690:2000
English Version
Welding and allied processes - Determination of hydrogen
content in arc weld metal (ISO 3690:2012)
Soudage et techniques connexes - Détermination de la Schweißen und verwandte Prozesse - Bestimmen des
teneur en hydrogène dans le métal fondu pour le soudage Wasserstoffgehaltes im Lichtbogenschweißgut (ISO
à l'arc (ISO 3690:2012) 3690:2012)
This European Standard was approved by CEN on 2 March 2012.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3690:2012: E
worldwide for CEN national Members.
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SIST EN ISO 3690:2012
EN ISO 3690:2012 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 3690:2012
EN ISO 3690:2012 (E)
Foreword
This document (EN ISO 3690:2012) has been prepared by IIW “International Institute of Welding” 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 September 2012, and conflicting national standards shall be
withdrawn at the latest by September 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3690:2000.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 3690:2012 has been approved by CEN as a EN ISO 3690:2012 without any modification.
3
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SIST EN ISO 3690:2012
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SIST EN ISO 3690:2012
INTERNATIONAL ISO
STANDARD 3690
Third edition
2012-03-15
Corrected version
2012-05-01
Welding and allied processes —
Determination of hydrogen content in arc
weld metal
Soudage et techniques connexes — Détermination de la teneur en
hydrogène dans le métal fondu pour le soudage à l'arc
Reference number
ISO 3690:2012(E)
©
ISO 2012
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
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 either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
Contents Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Test procedures . 2
4.1 Production of weld specimens . 2
4.2 Welding procedures for the production of weld specimens . 6
4.3 Measurement of hydrogen in the test weld . 13
4.4 Measurement of total hydrogen content in the weld metal — Rapid methods . 19
4.5 Rounding procedure . 19
Annex A (informative) Recommendations and restrictions in regard to older methods of
measurement using mercury . 20
Annex B (informative) Recommendations and restrictions in regard to older methods of
measurement using glycerin . 21
Annex C (informative) Accuracy and reproducibility . 22
Bibliography . 23
© ISO 2012 – All rights reserved iii
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SIST EN ISO 3690:2012
ISO 3690:2012(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 3690 was prepared by the International Institute of Welding, recognized as an international standardizing
body in the field of welding in accordance with Council Resolution 42/1999.
This third edition cancels and replaces the second edition (ISO 3690:2000), which has been technically
revised.
Requests for official interpretations of any aspect of this International Standard should be directed to the ISO
Central Secretariat, who will forward them to the IIW Secretariat for an official response.
This corrected version of ISO 3690:2012 incorporates the following corrections:
a) to comply with ISO quality documentation, references to Commission II and to TC 44/SC 3 have been
removed from paragraph 5 of this foreword;
b) the quality of Figures 1 and 3 has been improved in terms of resolution and presentation.
iv © ISO 2012 – All rights reserved
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SIST EN ISO 3690:2012
INTERNATIONAL STANDARD ISO 3690:2012(E)
Welding and allied processes — Determination of hydrogen
content in arc weld metal
1 Scope
This International Standard specifies the sampling and analytical procedure for the determination of diffusible
hydrogen in martensitic, bainitic, and ferritic steel weld metal arising from the welding of such steels using arc
welding processes with filler metal.
The techniques specified in this International Standard include collection of diffusible hydrogen via
displacement of mercury or collection into a headspace filled with an inert gas such as argon. The amount of
hydrogen collected is determined by measuring the displaced volume in the former and by, for example,
thermal conductivity in the latter.
The temperature for collection of diffusible hydrogen is controlled to avoid thermal activation of non-diffusible
hydrogen.
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 14175, Welding consumables — Gases and gas mixtures for fusion welding and allied processes
ISO/TR 17671-1, Welding — Recommendations for welding of metallic materials — Part 1: General guidance
for arc welding
ISO 80000-1, Quantities and units — Part 1: General
3 Principle
Filler material is deposited on to a standard test coupon in a manner that ensures control of pertinent variables
to produce a representative specimen for analysis. Subsequent storage and handling of the specimen is
controlled to prevent premature loss of hydrogen. Finally, the specimen is transferred to a gas collection
apparatus (mercury method) or to a suitable vessel filled with an inert gas (thermal conductivity method) and
held for a period of time at a temperature sufficient to quantitatively release the diffusible hydrogen into an
evacuated gas burette or into the inert gas headspace, respectively. The amount of hydrogen collected is
determined by measuring the displaced volume (mercury method) or by thermal conductivity. Finally,
quantification of the mass of deposited metal or volume of fused weld metal enables calculations of diffusible
hydrogen in deposited metal, H , or diffusible hydrogen in fused weld metal, H , to be made.
D F
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
4 Test procedures
4.1 Production of weld specimens
4.1.1 Summary
The welding consumable to be tested is used to deposit a single weld bead, which is rapidly quenched and
subsequently stored at 78 °C or lower until analysis. Cleaning and slag removal are performed on the chilled
specimen.
4.1.2 Welding fixture
An example of a suitable welding fixture to provide uniform test pieces for the welding processes specified in
4.2 is shown in Figure 1. It is designed to hold the uniform test pieces securely in alignment during welding
and, in particular, to ensure that unclamping upon completion of welding can be carried out in a single
operation according to the conditions specified in 4.1.4 c). The surface temperature of the fixture shall be
between ambient and 25 °C above ambient at the start of each test weld. The fixture may be water cooled to
decrease the cycle time. The temperature of the cooling water shall be controlled to prevent condensation of
water on the surface of the fixture between test welds.
For all welding processes, the test piece assembly is clamped in the welding fixture using annealed copper foil
as shown in Figure 1. The foil may be annealed repeatedly and quenched in water after each annealing.
Oxide scale after annealing is removed by pickling with dilute nitric acid (10 % by volume) followed by washing
with distilled water and drying.
2 © ISO 2012 – All rights reserved
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
Dimensions in millimetres
Key
1 test piece assembly per Figure 2
2 water cooling jacket (if necessary)
3 lever clamp
4 copper foil inserts (1 mm 15 mm min. 300 mm)
A copper
B carbon steel
Figure 1 — Example of a suitable welding fixture and test piece assembly for weld deposits
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
4.1.3 Test piece assemblies
The test piece assembly shall be prepared from plain carbon non-rimming steel with a carbon content of not
more than 0,18 % by mass and a sulfur content of not more than 0,02 % by mass. The assembly shall
conform to the dimensions shown in Figure 2 for assembly A, assembly B, or assembly C, with a tolerance of
0,25 mm on all dimensions except the length of the run-on and run-off pieces. The lengths shown in Figure 2
for the run-on and the run-off piece represent minimum values.
All surfaces shall be finished at right angles to ensure good contact between adjacent pieces during the
welding operation. Each test piece assembly may be finished with one operation on a surface grinder so as to
ensure a uniform width, or closer dimensional control may be exercised to obtain proper clamping. See
4.1.4 d) for evidence of proper clamping.
The centre test piece shall be numbered by engraving or stamping on the opposite side of that used for
welding. The entire test piece assembly shall be degassed at 650 °C 10 °C for 1 h and cooled in either a dry
inert gas atmosphere or a vacuum. Alternatively, the test piece assembly may be degassed and cooled in air if
the surface oxide layer is removed prior to testing. Degassed test piece assemblies shall be stored in a
desiccator or under other suitable conditions to prevent oxidation of the test pieces. After numbering and
removal of oxide, the mass, m , of each centre test piece shall be determined to the nearest 0,1 g for
1
assembly A or to the nearest 0,01 g for assembly B or assembly C.
Key
a run-on piece of length l
a
b run-off piece of length l
b
c centre test piece of length l
c
e test piece width
t test piece thickness
Dimensions in millimetres
l and l l
Test assembly e t
a b c
a
A ≥25 (50) 80 25 12
B ≥25 (50) 30 15 10
C ≥50 15 30 10
l ≥ 25 mm and l ≥ 25 mm: manual metal arc welding
a b
l ≥ 50 mm and l ≥ 50 mm: other welding processes
a b
a
[5]
Comparable to the specimen geometry according to AWS A4.3-93 .
Figure 2 — Dimensions of the weld test assembly
4 © ISO 2012 – All rights reserved
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
4.1.4 Welding and test piece storage
The temperature of the welding fixture before each weld is made shall be ambient or not more than 25 °C
above ambient. If difficulty is caused by condensation of water on the fixture and test piece assembly, it is
necessary to use cooling water thermostatically controlled to ambient temperature or as much as 25 °C higher.
Using the welding process as specified in 4.2, and parameters appropriate to the type of investigation, a single
weld bead shall be made on the test piece assembly that is clamped in the welding fixture as shown in
Figure 1.
The test piece assembly shall be cleaned in acetone prior to being clamped into the welding fixture. Copper
foil strips, as shown in Figure 1, shall be used to facilitate thermal transfer and prevent erosion of the fixture.
The welding procedure is specified in steps a) to f).
c) Welding shall be initiated on the run-on piece at a point sufficiently distant from the centre test piece such
that a stable arc and a stable deposit shape are achieved before reaching the centre test piece.
d) Welding shall be terminated when the trailing edge of the crater is on the run-off piece but shall not
exceed a distance of 25 mm from the centre test piece.
e) After extinction of the arc, the clamp shall be released and the test piece assembly removed and
immersed at 4 s 1 s in an ice water bath. After 20 s 2 s, the test piece assembly shall be transferred
and completely immersed in a low-temperature bath containing, for example, methanol and solid carbon
dioxide, denatured alcohol and solid carbon dioxide or liquid nitrogen. After removal of the specimen from
the ice water, ice shall still be present in the bath.
f) After a minimum of 2 min, the test assembly may be removed from the low temperature bath for cleaning
and inspection. All slag and welding fume residue shall be removed by steel wire brushing. The run-on
and run-off pieces shall be broken off from the centre test piece. The underside of this piece shall be
examined to assess the uniformity and extent of heat tinting. Properly aligned and clamped test
assemblies shall show parallel and uniform heat tinting of the underside of the centre test piece. Dark
oxidation shall not extend to the edges of the underside of the centre test piece. If this entire operation is
not completed within 60 s, the centre test piece shall be returned to the low temperature bath for a
minimum of 2 min before completing these steps.
g) Centre test pieces may be stored at 78 °C or lower in a methanol and solid carbon dioxide or denatured
alcohol and solid carbon dioxide bath for a period of up to 72 h or at 196 °C in liquid nitrogen for a period
of up to 21 days before analysis.
h) For purposes of classifying welding consumables, during welding of the test assembly, the ambient
absolute humidity shall be at least 3 g of water vapour per 1 000 g of dry air. (This corresponds to 20 °C
and 20 % relative humidity.) When the relative humidity, measured using a sling hygrometer or other
calibrated device, equals or exceeds this condition, the test shall be acceptable as demonstrating
compliance with the requirements of this International Standard provided the actual test results satisfy the
diffusible hydrogen requirements of the applicable consumable classification standard. (The
measurement of relative humidity can be easily converted to absolute humidity and reported as such.)
4.1.5 Recording of data
ata, as shown on the data sheets, shall be recorded on the appropriate weld data sheet.
All relevant welding d
Reference should be made to the suggested report forms for each welding process data sheet (see Tables 1,
2, and 3). Ambient conditions of temperature and humidity at the time of welding shall also be recorded and
absolute humidity reported with the analytical results.
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
4.2 Welding procedures for the production of weld specimens
4.2.1 Summary
The operating parameters of the welding process under investigation shall be defined to produce a single weld
bead on a test piece assembly as specified in 4.1. See 4.2.2 to 4.2.4 for specifications of the procedures for
different welding processes.
4.2.2 Manual metal arc welding
4.2.2.1 Electrodes
The covered electrode to be tested shall be used in one of the ways a) or b).
a) For purposes of classification, the electrode and the method of deposition of the weld shall be as
specified in the standard with which the electrode complies.
b) For purposes of investigation, the electrode and welding parameters shall be those given in the specific
welding procedure. If no procedure has been given, then a current that is 90 % of the maximum
suggested by the manufacturer shall be used.
When a predrying treatment is required, the time and temperature specified by the consumable manufacturer
shall be used. If a range is given by the manufacturer, e.g. 300 °C to 350 °C, then the average shall be used
and reported.
Electrodes with cracked or broken coatings shall not be used. Electrodes to be tested in the as-received
condition shall be taken from a freshly opened undamaged package. During any drying treatment, the
electrodes shall not touch each other or the side of the oven. During any drying operation, a calibrated oven
shall be used and the electrodes shall spend the full specified time at the drying temperature. Only electrodes
under test shall be placed in the oven during this time. When the drying operation is complete, the electrode
shall be cooled to ambient temperature in a container, e.g. a dried borosilicate glass tube sealed with a rubber
bung. The electrode shall be used as soon as possible after it reaches ambient temperature, but not more
than 1 h after removal from the oven unless securely sealed. Any electrodes removed from the drying oven
and not then used shall not be redried and subsequently used for the test.
When electrodes are to be tested in the as-received condition from a hermetically sealed container, the
electrodes shall be protected from moisture pickup once the seal is broken, until each can be welded. Some
sealed containers are resealable. In such a case, each test electrode can be withdrawn individually and the
container resealed while the withdrawn electrode is welded. If the container is not resealable, then all of the
test electrodes shall be withdrawn when the seal is broken, and each electrode shall be individually placed in
a dried borosilicate glass tube sealed with a rubber bung until the electrode is to be used for test.
4.2.2.2 Making the test welds
A copper fixture, such as that shown in Figure 1, shall be used for the alignment and clamping of the test
piece assembly. The fixture may incorporate water cooling channels in order to achieve a faster throughput of
test pieces. Either test piece assembly A or assembly B may be used.
If the classification standard is silent on this matter, the following shall apply. The classification of covered
electrodes is carried out using 4 mm diameter electrodes. In this case, the welding current shall be 15 A less
than the maximum or 90 % of the maximum stated by the manufacturer, being maintained within a tolerance
of 10 A. For an electrode with a diameter of 4 mm, the speed of welding shall be adjusted to produce an 8 g
minimum weld deposit on the centre test piece assembly A or a 3 g minimum weld deposit on the centre test
assembly B, which is usually accomplished with an electrode consumption of between 1,2 cm and 1,3 cm per
centimetre of weld. Record welding parameters and calculate heat input in accordance with ISO/TR 17671-1.
For all consumable diameters other than the 4 mm specified above, the weld deposit sample mass shall be
representative of good welding practice and appropriate for the diameter and process applied; no minimum
weld deposit sample mass is specified.
6 © ISO 2012 – All rights reserved
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
Three or more test welds shall be made on three or more test piece assemblies using a new electrode for
each weld. The deposit shall be made, without weaving, along the centre line of the test piece assembly, as
shown in Figure 1. The lengths of the run-on and of the run-off pieces shall be 25 mm minimum. No burning
off prior to testing shall be allowed. The run-on deposit length shall not exceed 25 mm. The time spent in
deposition shall be noted. Welding shall be terminated when the trailing edge of the crater is on the run-off
piece, but shall not exceed a distance of 25 mm from the centre test piece.
The method of using the welding fixture is specified in 4.1.4. When welding is completed, the weld specimen
shall be quenched and stored as specified in 4.1.4, after which it shall be cleaned and analysed for hydrogen
content as specified in 4.3.
At the time of welding, due to the influence of atmospheric moisture on the test results, for purposes of
classifying covered electrodes, the arc length shall be maintained as short as possible consistent with
maintaining a steady arc. For all purposes, the details listed in 4.2.2.3 shall be recorded.
4.2.2.3 Recording of welding data and results report form
The report sheet given in Table 1 provides full details of all the test variables that pertain to the test results.
Table 1 — Report form (diffusible hydrogen, manual metal arc)
Investigating laboratory: Date:
Investigator's name:
Brand name & electrode maker: Batch No.:
Type of electrode: Electrode designation:
Diameter of electrode (mm): Overall length of electrode (mm):
Drying treatment: . °C for . h
Electrode polarity (d.c. + ve, d.c. ve or a.c.):
Relative humidity . % and temperature . °C at the welding station during welding
Hydrogen extraction temperature: . °C
Hydrogen extraction time: . days . h . min
Type of test piece assembly (A or B):
Number of test piece: 1 2 3
Voltage, V; a.c. or d.c.:
Current, A:
Welding time, s:
Weld length, mm:
Heat input, kJ/mm:
Electrode length used, mm:
Run-on length, mm:
Mass of deposited metal on test piece, g:
Test piece to crater distance, mm:
Diffusible hydrogen
1 2 3 Average
a) H , ml/100 g of deposited metal:
D
b) H , ppm of fused metal:
F
Other test details not included above:
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SIST EN ISO 3690:2012
ISO 3690:2012(E)
4.2.3 Submerged arc welding
4.2.3.1 Electrode wire
The consumable solid or cored wire to be tested shall be used in one of the ways a) or b).
a) For purposes of classification, the welding parameters shall be the same as those used in the preparation
of the all-weld-metal test assembly for mechanical property determination using 4 mm electrode wire, with
travel speed adjusted to provide a deposit mass on the centre test piece of 8 g minimum (assembly A) or
3 g minimum for the smaller centre test piece (assembly C), unless otherwise specified in the
classification document. Test piece assembly B is not acceptable for submerged arc welds. For all
consumable diameters other than the 4 mm specified above, the weld deposit sample mass shall be
representative of good welding practice and appropriate for the diameter and process applied; no
minimum weld deposit sample mass is specified.
b) For purposes of investigation, the electrode wire and welding parameters shall be those given in the
specific welding procedure. The use of a solid wire that has been degassed in a vacuum or inert gas at
650 °C for 1 h facilitates the investigation of the effect of welding parameters, and type of flux and its
drying procedure, upon the hydrogen content of the weld.
The arc energy for making the weld is restricted to a maximum of 3 kJ/mm.
4.2.3.2 Flux
When drying is required, the flux shall be dried in one of the ways a) or b).
a) For purposes of classification, drying shall be done in accordance with the requirements of the standard
with which the flux complies. Any preconditioning or drying of the flux shall be reported when an “H”
designator is affixed to the flux classification.
b) For purposes of investigation, drying shall be done in accordance with the appropriate recommendations.
Approximately 1 kg of flux is required for three welds. Drying sha
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Questions, Comments and Discussion
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