GOST R ISO 17641-2-2012

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  ГОСТ Р ИСО 17641-2-2012

GOST R ISO 17641−2-2012 destructive Testing of welds of metallic materials. Test on resistance to hot cracking in welded joints. The arc welding processes. Part 2. Tests with the natural stiffness

GOST R ISO 17641−2-2012

Group B09

NATIONAL STANDARD OF THE RUSSIAN FEDERATION

DESTRUCTIVE TESTING OF WELDED JOINTS OF METALLIC MATERIALS

Test on resistance to hot cracking in welded joints. The arc welding processes

Part 2

Tests with the natural stiffness

Destructive tests on welds in metallic materials. Hot cracking tests for weldments. Arc welding processes. Part 2. Self-restraint tests

OKS 25.160.40

Date of introduction 2014−01−01

Preface

1 PREPARED by the Federal state institution «Scientific-educational center «welding and control» at MGTU im.N. Uh. Bauman (FGU «NORSK» at MSTU.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 international standard indicated 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 22 November 2012 No. 1009-St

4 this standard is identical to international standard ISO 17641−2:2005* «Destructive testing of welds of metallic materials. Test on resistance to hot cracking in welded joints. The arc welding processes. Part 2. Tests with the natural rigidity» (ISO 17641−2:2005 «Destructive tests on welds in metallic materials — Hot cracking tests for weldments — Arc welding processes — Part 2: Self-restraint tests»).
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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


Application rules of this standard are established in GOST R 1.0−2012 (section 8). Information about the changes to this standard is published in the annual (as of January 1 of the current year) reference index «National standards» and the official text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the upcoming issue of the 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 (gost.ru)

Introduction

ISO 17641−2 by the European Committee for standardization (CEN) in collaboration with technical Committee ISO/TC 44 «welding and allied processes», Subcommittee SC 5 «Testing and inspection of welds» in accordance with the Agreement on technical cooperation between ISO and SEN (Vienna Agreement).

ISO 17641 consists of the following parts, under the General name of «Destructive testing of welds of metallic materials. Tests on resistance to formation of hot cracks in welded connections» and includes:

part 1. General provisions;

part 2. Tests with the natural stiffness;

part 3. Tests with the application of external loads (a technical report).

1 Scope

This standard establishes requirements for samples and procedures that should be performed when testing welded joints with the natural torsional resistance to hot cracking.

Describes the following tests:

— test for resistance to hot cracking t-joint;

— tensile test of the weld metal;

— resistance to buckling.

The tests were designed to obtain information about the sensitivity of the weld metal to hot cracking. Tests suitable for assessing the basic materials.

This standard is used for the weld metal, primarily austenitic corrosion-resistant steels, Nickel, alloys based on Nickel and Nickel-copper alloys.

This standard describes only the rules of execution of tests and reporting their results. It does not establish acceptance criteria.

2 Normative references

This standard uses the regulatory references to the following international standards*. For dated references, subsequent amendments to or changes in any of these publications is valid for present standard only after the introduction of amendments and changes to it.
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* The table of conformity of national standards international see the link. — Note the manufacturer’s database.

YONG 876 Destructive tests of welded joints of metallic materials. The test of longitudinal tensile of the weld metal of joints made by fusion welding (EN 876, Destructive tests on welds in metallic materials — Longitudinal tensile test on weld metal in fusion welded joints)

EH 910 Destructive tests of welded joints of metallic materials. Bend test (EN 910, Destructive tests on welds in metallic materials — Bend tests)

EH 1597−1 welding Materials. Test methods. Part 1. Control sample for testing the deposited weld metal steels, Nickel and Nickel alloys (EN 1597−1, Welding consumables — Test methods — Part 1: Test piece for all-weld metal test specimens in steel, nickel and nickel alloys)

EH 10002−1 Metallic materials. The tensile test. Part 1. Method of test at ambient temperature (EN 10002−1, Metallic materials — Tensile testing — Part 1: Method of test at ambient temperature)

EH ISO 15614−1 Technical requirements and certification of welding procedures of metallic materials. Verification of welding procedures. Part 1. Arc and gas welding of steels and arc welding of Nickel and Nickel alloys (ISO 15614−1:2004) (EN ISO 15614−1, Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614−1:2004))

EH ISO 17641−1:2004 Destructive tests of welds in metallic materials. Test on resistance to hot cracking in welded joints. The arc welding processes. Part 1. General provisions (ISO 17641−1:2004) (EN ISO 17641−1:2004, Destructive tests on welds in metallic materials — Hot cracking tests for weldments — Arc welding processes — Part 1: General (ISO 17641−1:2004))

3 Terms and definitions

This standard applies the terminology and definitions given in EN ISO 17641−1:2004.

4 Indicators, symbols and units

Applied in standard notation and units of measurement are given in table 1.


Table 1 — Parameters, symbols and units

5 Main provisions

Describe the three types of tests that are designed to determine the resistance of weld metal hot cracks (see table 2).


Table 2 — Testing the natural torsional resistance to formation of hot cracks and their application

In all cases, cracks occur during welding of test specimens.

When testing tensile and longitudinal bend specimens are additionally load that does not cause new cracks, but extends formed by welding the cracks and thereby makes it easier to detect and measure them.

6 description of the tests

6.1 Test of resistance to hot cracking in the weld t-joints

6.1.1 General provisions

The test procedure is applied to the corner of a single-pass weld, which is in a state of stress. It can be used with the application of processes manual arc welding, metal arc and shielded arc welding the gas metal and tungsten electrodes. The test procedure unsuitable for processes characterized by large values of welding current, such as arc welding under flux.

The test provides only a qualitative assessment (Yes or no cracks) and has a relatively low sensitivity.

6.1.2 the Dimensions of the reference samples

There are three types of samples (A, b and C). Type a is a standard sample. Types b and C are more strained samples and applied for the simulation of more stringent conditions.

The dimensions of the reference samples are given in figure 1.

Control samples made from material for welding which is designed for welding material (welding certification test material) or to be used in production (qualification test procedure).

Type In requires the use of a horizontal sheet with a thickness of 40 mm. If this is unacceptable, can be used a type in which the use of the stiffener thickness of 10 mm, welded to the horizontal plate. The thickness of horizontal and vertical sheets and/or stiffeners can be changed.

Figure 1 — examples of types A, b and C for tests on the resistance to cracking in the weld t-joints

Dimensions are in millimeters

 — vertical sheet;  — tack welding seams;  — 1 weld;  — weld 2;  — horizontal sheet;  — measurement

a) Type And

 — joint thickness (6 mm);  — vertical sheet;  — tack welding seams;  — 1 weld;  — weld 2;  — horizontal sheet;  — measurement

b) Type In

 — vertical sheet;  — tack welding seams;  — 1 weld; — weld 2;  — horizontal sheet;  — measurement;  — ribs;  — variable depending on

Note ,  — the dimensions of the thickness of the sheets, which are available or specified.

C) Type With

Figure 1 — examples of types A, b and C for tests on the resistance to cracking in the weld t-joints

6.1.3 Preparation of control samples

Since any gap between the vertical and horizontal sheets increases the risk of cracks in the seams of the subjects, it is important to have intimate contact between them. This can be achieved by machining the mating surfaces.

The subjects leaves near the welding should be cleaned and should not have grease, coolants, paint and rust, which may affect the test results.

6.1.4 welding control samples

Tack welding seams must be of high quality and are made with both ends of the vertical sheet (see figure 1) to lock the horizontal and vertical sheets angle of exactly 90°.

Test seams shall be made in accordance with the documented technical requirements of the weld procedure (WPS) as stipulated in EN ISO 15614−1, unless otherwise specified. The conditions and the welding parameters must match subject to the application of the basic and welding materials and be designed to obtain the smallest sizes of the welds. To ensure the same profile seam across the length of the sample, using input and output trims.

The first weld should be made continuous, with a minimum thickness of 5 mm, in position PB. The second weld shall commence no later than 20 after the first.

After completion of welding slag (if any) should be removed from both corner seams. If to facilitate slag removal use a hammer or emery wheel, care should be taken to prevent damage to the surfaces of seams, which can have hidden cracks.

6.1.5 Verification of control samples

To check the subjects of the welds for cracks check the thickness of the seams and the measurement points specified in figure 1. Both the weld should satisfy the smallest dimensions given in 6.1.4, and additionally the thickness of the first weld should not exceed the thickness of the second weld more than 120%. When the requirements to the dimensions of the weld test is considered invalid.

Corner seam suitable control sample to check for cracks. Check carried out visually by increasing no more than X5. For the detection of cracks can be used to test penetration of the dye liquid.

The first seam should not have cracks.

Any cracks discovered in the second seam should be recorded. In the test report (see Annex A) should be marked the position, orientation and length of each crack.

6.1.6 test report

The test results can be provided in any agreed form and must have a reference to this standard. As an example, Appendix A contains a test report on the resistance to hot cracking in the weld t-joints.

6.2 tensile Test on weld metal

6.2.1 General provisions

The test procedure is applicable to multi-pass weld metal. It is suitable for all arc welding processes. The test provides a qualitative and quantitative assessment, if used index of sensitivity to cracks .

The application of destructive load to a cylindrical specimen from the weld metal, cut from the butt joint, detects arose when welding cracked.

6.2.2 Sample for test

6.2.2.1 test seam

The sample for test shall be selected from any suitable butt weld, the size of which is sufficient for cutting a sample for testing. Butt joint can be selected from those used for the other tests, for example, standard mechanical testing. It needs to be made in accordance with the documented technical requirements of the weld procedure (WPS), which should conform to EN ISO 15614−1, unless otherwise specified.

6.2.2.2 Sample for test

Standard sample for tensile testing of 10 mm diameter according to EN 10002−1 and EN 876 must be made of the test weld using mechanical treatment (figures 2 and 3). The length of the working part of the specimen must consist entirely of weld metal. To make sure that you test only the weld metal, for cross-sections of the test sheet can be made of the macrosections. The sample must be clearly identified in the method and regulations that will not affect the test results.

Figure 2 — Production of control samples for tensile tests of the weld metal

 — the thickness of the sheet

Figure 2 — Production of control samples for tensile tests of the weld metal

Figure 3 — Sample for tensile tests of the weld metal

Note — 10 mm, 50 mm, 55 mm, 75 mm.

Figure 3 — Sample for tensile tests of the weld metal

6.2.2.3 Test

The tensile test is performed in accordance with YONG 876, unless otherwise specified.

6.2.3 testing the sample for testing

The monitoring should be done in the area of the measurement base , as shown in figure 4 (this area is determined by the original size before the test ). It should be carried out using suitable means of magnification, which is sufficient to detect cracks with a length of at least 0.1 mm. Position, length and orientation of such cracks should be noted in the test report (see Annex).

Figure 4 — test Area L in the sample for the tensile test of the weld metal

Note — .

Figure 4 — test Area in the sample for the tensile test of the weld metal

To quantify the sensitivity to cracking may be used an indicator of the sensitivity to cracks in the tensile test ().calculated by the formula

,

where is the total length of all cracks with a length of at least 0.1 mm;

 — the measured length on the specimen for the test.

6.2.4 test Protocol

The test results can be provided in any form and must have a reference to this standard. As an example, in the application In the Protocol of the tensile tests of the weld metal.

6.3 Test for longitudinal bending

6.3.1 General provisions

The test procedure is applicable to multi-pass weld metal. It is suitable for all arc welding processes. The test method provides qualitative and quantitative assessment, if used index of sensitivity to cracks .

Bending of the longitudinal butt joint sample of detects cracks that occurred during welding. The bending is performed so that the pattern is on one side subjected to tension.

6.3.2 the Subject weld

Sample for test are made from the fit butt joint with sufficient sample sizes. Butt joint can be used for other tests, for example, standard mechanical testing.

Butt joint is performed in accordance with the documented technical requirements of the weld procedure (WPS). They must comply with EN ISO 15614−1, unless otherwise specified.

6.3.3 Sample for test

The sample size shown in figure 4, should be made of the test weld (figures 5 and 6) in accordance with the requirements EN 910, unless otherwise specified. The sample must be clearly identified on the basis of the method and the provisions that will not affect the test results.

Figure 5 — Sample for testing buckling

Dimensions are in millimeters

Surface roughness in microns

1 — the direction of sanding; 2 — ground floor; 3 — pane check for the presence of hot cracks; 4 — the surface of the sheet

Note 1: For bending specimen: the diameter of mandrel 20 mm, a bend angle of 120°.

Note 2 — For the study sample: increase of the stereomicroscope from 10 — to 25-fold.

Figure 5 — Sample for testing buckling

Figure 6 — Production of a control sample longitudinal samples for testing

Dimensions are in millimeters

 — the sample for test of butt joint

Figure 6 — Production of a control sample longitudinal samples for testing

6.3.4 surface Preparation

The sample surface must be machined and polished in the longitudinal direction to ensure that surface roughness is not more than 6.3 µm. You should avoid marks on the surface perpendicular to the direction of welding, which may cause false cracks. Corners should be rounded off, as shown in figure 4.

To identify the region of the weld can be used for easy etching.

6.3.5 Test

The bend test should be performed according to EN 910, except that the mandrel diameter must be 20 mm (4x specimen thickness). The angle of bend should be not less than 120°.

6.3.6 Validation sample for test

Checking for cracks should be performed in the specified region, as shown in figure 4 (this area is determined by the original size before the test). Verification should be performed using appropriate tools, providing increase from 10 — to 25-fold. The increase must be sufficient to detect cracks with a width of at least 0.1 mm. the Value increase should be recorded in the test report. The position, length and orientation of such cracks should be noted in the test report (see Appendix C).

To provide a quantitative evaluation of the resistance to cracking can be used an indicator of the sensitivity to micro-cracks during the test for longitudinal bending . calculated by the formula

,

where  — the total length of all cracks with a length of at least 0.1 mm;

 — initial width of specimen (undeformed) equal to 40 mm;

 — the initial length of the test (undeformed) equal to 30 mm.

6.3.7 test report

The test results can be provided in any agreed form and must have a reference to this standard. As an example, in Appendix C the following is the test report on buckling.

Annex a (informative). Test report for resistance to hot cracking in the weld t-joints

Appendix A
(reference)

Table A. 1 — Test of resistance to hot cracking in the weld t-joints

Annex b (informative). The Protocol of the tensile tests of the weld metal

The App
(reference)

Table B. 1 — tensile Test of the weld metal

Note — For the standard sample is 10 mm.

Application (reference). Test report on buckling

Application
(reference)

Table C. 1 — Test on the longitudinal bending

Annex ZA (informative). A list of the relevant European and international standards, which equivalents are not given in the text

Annex ZA
(reference)

App YES (reference) Data on compliance with the reference international standards reference the national standards of the Russian Federation

App YES
(reference)

Table YES.1