GOST R ISO 17642-1-2011
GOST R ISO 17642−1-2011 destructive Testing of welds of metallic materials. Tests on resistance to formation of cold cracks in welded joints. The arc welding processes. Part 1. General provisions
GOST R ISO 17642−1-2011
Group B09
NATIONAL STANDARD OF THE RUSSIAN FEDERATION
DESTRUCTIVE TESTING OF WELDED JOINTS OF METALLIC MATERIALS
Tests on resistance to formation of cold cracks in welded connections
The arc welding processes
Part 1
General provisions
Destructive tests on welds in metallic materials. Cold cracking tests for weldments. Arc welding processes. Part 1. General
OKS 25.160.40
Date of introduction 2013−01−01
Preface
The objectives and principles of standardization in the Russian Federation established by the Federal law of 27 December 2002 N 184-FZ «On technical regulation», and rules for the application of national standards of the Russian Federation — GOST R 1.0−2004 «Standardization in the Russian Federation. The main provisions"
Data on standard
1 PREPARED by the Federal state institution «Scientific-educational center «welding and control» at MGTU im. N. Uh. Bauman» (FGU «NORSK computer. N. Uh. Bauman») and the National Agency for control and welding (NAKS) on the basis of their own authentic translation into the Russian language of the standard referred to in paragraph 4
2 SUBMITTED by the Technical Committee for standardization TC 364 «welding and allied processes"
3 APPROVED AND put INTO EFFECT by the Federal Agency for technical regulation and Metrology dated 30 November 2011 No. 662-St
4 this standard is identical to international standard ISO 17642−1:2004* «Destructive testing of welds of metallic materials. Tests on resistance to formation of cold cracks in welded joints. The arc welding processes. Part 1. General provisions» (ISO 17642−1: «in 2004, Destructive tests on welds in metallic materials — Cold cracking tests for weldments — Arc welding processes — Part 1: General»).
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* Access to international and foreign documents mentioned here and below, you can get a link on the website shop.cntd.ru. — Note the manufacturer’s database.
In applying this standard it is recommended to use instead of the referenced international standards corresponding national standards, the details of which are given in Appendix YES
5 INTRODUCED FOR THE FIRST TIME
Information about the changes to this standard is published in the annually issued reference index «National standards», and the text changes and amendments — in monthly indexes published information «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in a monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet
Introduction
ISO 17642−1 by the European Committee for standardization (CEN) in collaboration with technical Committee ISO/TC 44 «welding and allied processes», Subcommittee SC 5 «Testing and weld inspection» in accordance with the Agreement on technical cooperation between ISO and SEN (Vienna Agreement).
ISO 17642 consists of the following parts, under the General name of «Destructive testing of welds of metallic materials. Tests on resistance to formation of cold cracks in welded joints. The arc welding processes»:
— part 1. General provisions;
— part 2. Tests with the natural stiffness;
— part 3. Tests with the application of an external load.
1 Scope
This standard contains the basic provisions relating to formation of cold cracks and principles of testing on the resistance to he of welded joints. These tests may be used to determine the resistance to cold cracking welding consumables, the base metal and the weld metal. The most common tests.
Also includes the test procedure, resistance to formation of cold cracks. Classification and field of application of the test given in EN ISO 17642−2 and EN ISO 17642−3.
2 Normative references
This standard uses the regulatory references to the following international standards. Subsequent amendments or modifications are valid for dated references of this standard only after the introduction of amendments and changes to it. For undated references the latest applicable edition of the referenced document (including amendments thereto).
EN ISO 17642−2 Destructive testing of welds of metallic materials. Tests on resistance to formation of cold cracks in welded joints. The arc welding processes. Part 2. Tests with a natural stiffness (ISO 17642−2:2005)
EN ISO 17642−2 Destructive tests on welds in metallic materials — Cold cracking tests for weldments — Arc welding processes — Part 2: Self-restraint tests (ISO 17642−2:2005)
EH ISO 17642−3 Destructive testing of welds of metallic materials. Tests on resistance to formation of cold cracks in welded joints. The arc welding processes. Part 3. Tests with the application of an external load (ISO 17642−3:2005)
EN ISO 17642−3 Destructive tests on welds in metallic materials — Cold cracking tests for weldments — Arc welding processes — Part 3: Externally loaded tests (ISO 17642−3:2005)
3 Terms and definitions
This standard applies the following terms with respective definitions:
3.1 cold cracks (cold cracks): Local cracks (intergranular or transcrystalline), resulting from critical combinations of microstructure, stress and hydrogen content.
Note 1 — the Cold cracks also known as hydrogen or delayed cracking.
Note 2 — the Cold cracks occur at temperatures below a solidus temperature after an undetermined number of days after welding.
3.2 test procedure, resistance to cold cracking (cold cracking test procedures): Procedures used for determining the resistance to cold cracking of the base metal, weld metal and welded joints with reference to applicable welding procedure.
3.3 tests with a natural stiffness (self-restraint tests): Tests in which the loading of the sample generates residual stresses during and after welding of the clamped node.
3.4 testing with application of an external load (externally loaded tests): Tests in which voltages in the sample are the result of the test procedure with the application of an external load.
4 Main provisions
Cold cracks occur after complete cooling at the critical combination of microstructure, stress and hydrogen content.
The microstructure is mainly determined by the chemical composition and cooling time in the temperature range between 800 °C and 500 °C (8/5).
Voltage is the result of the influence, primarily, the possible level of the stress state, i.e. the yield strength of the material and the stresses near the weld directly after welding, due to the restriction of deformation and shrinkage of the metal.
The hydrogen content depends on application of hydrogen as a function of moisture coating of the electrodes or of the moisture flux and diffusion of hydrogen as a function of heating temperature: pre, in between welding passes, and after welding.
Note — For steels in which the transition point AC1 is much lower 500 °C, more typical is the cooling time between 700 °C and 300 °C.
The test procedures for resistance to cold cracking using the samples with natural stiffness, the stresses in the test are generated only as a result of the shrinkage of the weld metal. Testing types and their main uses is given in table 1.
Table 1 — Tests for resistance to cold cracking in the samples with a natural stiffness (see EN ISO 17642−2) and their application
| The type of test |
Application |
| CTS-test (CTS — test) | Evaluation of the main, welding materials and welding procedures |
| Test with a Y-shaped cut (Tekken test) Test with U-shaped cut (Lehigh test) |
Definition: the least energy during welding; — the minimum preheat temperature; — the minimum temperature related heating; — most of the content of diffusion hydrogen |
| Note — the Procedure provides a qualitative assessment (there are cracks/no cracks) or quantitative evaluation (definition of the boundary conditions that determine the presence or absence of cracks). | |
In the test procedure for resistance to cold cracking with the application of an external load on the sample is exposed using an appropriate loading device force that creates a certain tension. The types of tests and their application are given in table 2.
Table 2 — Tests for resistance to formation of cold cracks under external loads (see EN ISO 17642−3) and their application
| The type of test |
Application |
| The implant test (Implant test) | Assessment of welding and basic materials. Definition: the least energy during welding; — the minimum preheat temperature; — the minimum temperature related heating; — the minimum heating temperature after completion of welding; — most of the content of diffusion hydrogen; — critical stress |
| Note — the Procedure provides a qualitative assessment (there are cracks/no cracks, the only test) or quantitative evaluation (definition of the boundary conditions that determine the presence or absence of cracks). | |
App YES (reference). Information about the compliance of the referenced international standards reference the national standards of the Russian Federation
App YES
(reference)
Table YES.1
| Marking the reference international standard | The degree of compliance | Designation and name of the relevant national standard |
| EN ISO 17642−2 |
- | * |
| EN ISO 17642−3 |
- | * |
| * The corresponding national standard is missing. Prior to its adoption, it is recommended to use the translation into Russian language of this international standard. The translation of this international standard is the National Agency for control and welding (NAKS). | ||
