SIST EN ISO 17642-2:2005

Destructive tests on welds in metallic materials - Cold cracking tests for weldments - Arc welding processes - Part 2: Self-restraint tests (ISO 17642-2:2005)

This standard specifies the sizes of the test pieces, the specimens and the procedures for carrying out self-restraint cold cracking tests by:
3   CTS(Controlled Thermal Severity)-test
3   Tekken (U-groove) or Lehigh (Y-groove) test
in order to obtain information about the cold cracking sensitivity during welding.
This standard applies primarily but not exclusively to C-Mn and low alloy steels.

Zerstörende Prüfung von Schweißverbindungen an metallischen Werkstoffen - Kaltrissprüfungen für Schweißungen - Lichtbogenschweißprozesse - Teil 2: Selbstbeanspruchende Prüfungen (ISO 17642-2:2005)

Essais destructifs des soudures sur matériaux métalliques - Essais de fissuration a froid des assemblages soudés - Procédés de soudage a l'arc - Partie 2: Essais sur éprouvette auto-bridée (ISO 17642-2:2005)

L'ISO 17642-2:2005 spécifie les dimensions des pièces d'essai, les éprouvettes et les modes opératoires pour les essais de fissuration à froid sur éprouvette auto-bridée suivants:
essai CTS (Controlled Thermal Severity);essai Tekken (chanfrein en Y) ou essai Lehigh (chanfrein en U);
afin d'obtenir des informations sur la sensibilité à la fissuration à froid lors du soudage.
L'ISO 17642-2:2005 s'applique principalement, mais non exclusivement, aux aciers C-Mn et aux aciers non alliés.

Porušitveni preskusi zvarov na kovinskih materialih – Preskusi na pokanje v hladnem za zvarne spoje – Obločni načini varjenja – 2. del: Preskus pokljivosti na prosto vpetem preskušancu (ISO 17642-2:2005)

General Information

• Status: Published
• Publication Date: 30-Apr-2005
• ICS: 25.160.40 - Welded joints and welds
• Technical Committee: VAR - Welding
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2005
• Due Date: 01-May-2005
• Completion Date: 01-May-2005
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: EN ISO 17642-2:2005 - Destructive tests on welds in metallic materials - Cold cracking tests for weldments - Arc welding processes - Part 2: Self-restraint tests (ISO 17642-2:2005)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 17642-2:2005
01-maj-2005
3RUXãLWYHQLSUHVNXVL]YDURYQDNRYLQVNLKPDWHULDOLK±3UHVNXVLQDSRNDQMHY
KODGQHP]D]YDUQHVSRMH±2EORþQLQDþLQLYDUMHQMD±GHO3UHVNXVSRNOMLYRVWLQD
SURVWRYSHWHPSUHVNXãDQFX,62
Destructive tests on welds in metallic materials - Cold cracking tests for weldments - Arc
welding processes - Part 2: Self-restraint tests (ISO 17642-2:2005)
Zerstörende Prüfung von Schweißverbindungen an metallischen Werkstoffen -
Kaltrissprüfungen für Schweißungen - Lichtbogenschweißprozesse - Teil 2:
Selbstbeanspruchende Prüfungen (ISO 17642-2:2005)
Essais destructifs des soudures sur matériaux métalliques - Essais de fissuration a froid
des assemblages soudés - Procédés de soudage a l'arc - Partie 2: Essais sur éprouvette
auto-bridée (ISO 17642-2:2005)
Ta slovenski standard je istoveten z: EN ISO 17642-2:2005
ICS:
25.160.40 Varjeni spoji in vari Welded joints
SIST EN ISO 17642-2:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 17642-2:2005

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SIST EN ISO 17642-2:2005
EUROPEAN STANDARD
EN ISO 17642-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2005
ICS 25.160.40
English version
Destructive tests on welds in metallic materials - Cold cracking
tests for weldments - Arc welding processes - Part 2: Self-
restraint tests (ISO 17642-2:2005)
Essais destructifs des soudures sur matériaux métalliques - Zerstörende Prüfung von Schweißverbindungen an
Essais de fissuration à froid des assemblages soudés - metallischen Werkstoffen - Kaltrissprüfungen für
Procédés de soudage à l'arc - Partie 2: Essais sur Schweißungen - Lichtbogenschweißprozesse - Teil 2:
éprouvette auto-bridée (ISO 17642-2:2005) Selbstbeanspruchende Prüfungen (ISO 17642-2:2005)
This European Standard was approved by CEN on 9 February 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
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 17642-2:2005: E
worldwide for CEN national Members.

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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
Contents page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Designation and symbols .5
5 Principle.5
5.1 General.5
5.2 Qualitative evaluation.5
5.3 Quantitative evaluation .5
6 Test.6
6.1 CTS-test .6
6.1.1 Dimensions of the test pieces .6
6.1.2 Preparation of the test pieces .6
6.1.3 Anchor welds .7
6.1.4 Test welds.8
6.1.5 Test results.10
6.2 TEKKEN-test (Y-groove) and Lehigh test (U-groove) .12
6.2.1 General.12
6.2.2 Dimensions of the test pieces .12
6.2.3 Preparation of the test pieces .14
6.2.4 Anchor welds .14
6.2.5 Test welds.14
6.2.6 Test results.16
7 Test report (CTS, Y and U groove).19
Annex A (informative) Test report for CTS test .20
Annex B (informative) Test report for Y- or U-joint (TEKKEN) weld cracking test .21
Annex ZA (normative) Normative references to International publications with their relevant
European publication .22

2

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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
Foreword
This document (EN ISO 17642-2:2005) has been prepared by Technical Committee CEN/TC 121 “Welding”,
the secretariat of which is held by DIN, 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 September 2005, and conflicting national standards shall be
withdrawn at the latest by September 2005.
EN ISO 17642 consists of the following parts, under the general title Destructive tests on welds in metallic
materials - Cold cracking tests for weldments - Arc welding processes:
- Part 1: General
- Part 2: Self-restraint tests
- Part 3: Externally loaded tests
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.

3

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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
1 Scope
This standard specifies the sizes of the test pieces, the specimens and the procedures for carrying out self-
restraint cold cracking tests by:
 CTS(Controlled Thermal Severity)-test
 Tekken (Y-groove) or Lehigh (U-groove) test
in order to obtain information about the cold cracking sensitivity during welding.
This standard applies primarily but not exclusively to C-Mn and low alloy steels.
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.
EN 1043-1:1995, Destructive tests on welds in metallic materials  Hardness testing  Part 1: Hardness test
on arc welded joints
EN 1321, Destructive tests on welds in metallic materials  Macroscopic and microscopic examination of
welds
EN ISO 3690, Welding and allied processes - Determination of hydrogen content in ferritic arc weld metal
(ISO 3690:2000)
EN ISO 17642-1:2004, Destructive tests on welds in metallic materials - Cold cracking tests for weldments -
Arc welding processes - Part 1: General (ISO 17642-1:2004)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 17642-1:2004 apply.
4

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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
4 Designation and symbols
The following designations and symbols given in Table 1 apply.
Table 1  Designation and symbols

Symbol Designation Unit
CTS-test
t material thickness mm
L leg length vertical mm
v
L leg length horizontal mm
H
L length of the test bead mm
 Tekken or Lehigh test (Y and U-groove)
t material thickness mm
g
root gap mm
W diameter of drilled hole and groove width mm
C crack ratio for surface cracks %
f
C crack ratio for root cracks %
r
C crack ratio for cracks in sections %
s
l length of surface crack mm
f
l length of root crack mm
r
H height root crack mm
c
H minimum thickness of test bead mm
L length of the test bead mm
5 Principle
5.1 General
The self-restraint cold cracking tests are designed to assess the cold cracking sensitivity of the parent
materials and the arc welding consumables. The test consists of depositing a weld bead on a test sample
made of two plates with pre-defined conditions and to examine transverse cut faces of the weld with a view to
detect possible cracks either in the weld metal or in the heat affected zone.
This test procedure essentially applies to metal arc welding with covered electrodes and semi-automatic gas
metal arc welding using solid and tubular wires. In general this method is not used for high current processes
such as submerged-arc welding.
5.2 Qualitative evaluation
When using well determined welding conditions for welding a given material, a single evaluation test is
performed. In the case of the CTS-test, the two test welds are examined.
5.3 Quantitative evaluation
When aiming at determining the cracking limit, a series of tests shall be performed. The no crack test shall be
repeated, on the contrary, other tests shall be performed.
5

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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
6 Test
6.1 CTS-test
6.1.1 Dimensions of the test pieces
The dimensions of the test piece shall be in accordance with Figure 1.
Dimensions in millimetres


Key
1 Clearance hole 13 mm diameter
2 Top plate
3 Root notch gap
4 Bottom plate
5 Root notch depth
6 Preferred principal rolling direction
7 Test welds
8 Anchor welds


Figure 1  CTS test

6.1.2 Preparation of the test pieces
All test pieces shall be prepared from those parent materials which are actually to be welded with the welding
consumables to be tested (see Figure 2).
Machine the test material for the pieces by sawing, milling or grinding. Ensure that surfaces to be welded are
milled or ground finish. Take care to minimize heating and deformation in the material during machining.
Use the general arrangement of the test piece shown in Figure 1 and the tolerances and surface finish
requirements given in Table 2.
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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
Table 2  CTS test piece dimensions/conditions and tolerances
Dimension/conditions Values
Material thickness, t 6 mm min.
Top block
(75 ± 1) mm x (75 ± 1) mm x t

Bottom block
(250 ± 3) mm x (100 ± 3) mm x t


Root notch
depth (10 ± 0,5) mm
gap
(1,6 ± 0,10) mm

Torque on bolt
(100 ± 5) N⋅m

Surface finish on mating faces
3,2 µm R max.
a

Surface finish on area to be welded 6,3 µm R max.
a

Mating face gap 0,05 mm max.

Top and bottom blocks shall both have the same thickness. Top blocks shall be machined and bottom blocks
may be machined or flame cut. Both blocks shall be of the same material.
In those exceptional circumstances where it is impossible to machine both blocks from the test material, the
top block shall be from the material under test and the bottom block from a material of equivalent yield
strength. It is important that the susceptibility of the bottom block to HAZ hydrogen cracking is less than that of
the test material.
Where the principal rolling direction of the plate can be determined, arrange the rolling directions of the top
and bottom plates to be the same (see Figure 1).
Ensure that the surfaces to be welded are ground smooth and free from scale, rust, oil, grease and other
contaminants.
Use a bolt with a 12 mm diameter for assembling the blocks. Degrease the bolt, a suitable plain nut and any
washers to be used prior to use. Do not use nuts and bolts treated by plating processes. Insert the bolt
through the top and bottom blocks, add the nut and washers and tighten to the required torque (see Table 2).
Check the torque value prior to all welding operations and adjust as necessary.
6.1.3 Anchor welds
Make the anchor welds (shown in Figure 1) with a welding consumable with a yield strength equal to or
greater than the yield strength of the material under test, up to parent material yield strength of 895 N/mm².
NOTE Where the yield strength of the parent material exceeds 895 N/mm², the consumable selected can have a
yield strength less than that of the parent material (but greater than 895 N/mm²) and /or austenitic stainless steel weld
deposit can be used.
Start and finish the anchor fillet welds 10 mm (± 3 mm) from the corners of the top plate and make them the
following throat sizes:
up to 15 mm plate thickness: (6 ± 1) mm;
plate thickness 15 mm and over: (13 ± 1) mm.
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SIST EN ISO 17642-2:2005
EN ISO 17642-2:2005 (E)
Deposit the welds with a procedure to avoid hydrogen cracking, using preheat, interpass and post-heating
control as necessary.
Dry all consumables used for anchor welds in accordance with the manufacturers’ recommendations to give
the lowest possible hydrogen levels.
Check the torque on the bolt and tighten the bolt where necessary. Leave the assembly for 12 h before test
welding.
6.1.4 Test welds
6.1.4.1 Preheating
When the test piece is to be preheated, place the assembly in an oven and leave it for sufficient time to
ensure even and thorough heating. Set the oven at a higher temperature than required for the test in order to
allow for cooling of the assembly during transfer and set-up.
Prior to any welding, check the temperature of the test blocks using a calibrated surface pyrometer or
thermocouple. Where the tests demand a specific preheat temperature, welding should not be commenced
until the required temperature is achieved. Temperatures of the top and bottom blocks in the test area shall
not differ by more than 5 °C.
6.1.4.2 Deposition
A jig should be used to position the assembly. The position of the electrode/wire with respect to the test block
(see Figure 2) shall be such that the deposited test welds are symmetrically in the flat positions across the full
width of the block in a single direction and in a single pass. Ensure that the test weld does not extend beyond
the ends of the block.

Key

1 Test jig
2 Welding consumable
Figure 2  Jig used to position test assembly
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SIST EN ISO 17642
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