1、BRITISH STANDARD BS 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 The European Standard EN ISO 17642-2:2005 has the status of a British Standard ICS 25.160.40 BS EN ISO 17642-2:2005 This Briti
2、sh Standard was published under the authority of the Standards Policy and Strategy Committee on 12 April 2005 BSI 12 April 2005 ISBN 0 580 45783 4 National foreword This British Standard is the official English language version of EN ISO 17642-2:2005. It is identical with ISO 17642-2:2005. It supers
3、edes a test detailed in BS 7363:1990 which has been deleted by amendment. The UK participation in its preparation was entrusted to Technical Committee WEE/2, Welding tests, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secret
4、ary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalog
5、ue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the
6、 text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front
7、 cover, an inside front cover, the EN ISO title page, pages 2 to 22, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROP
8、ISCHENORM ENISO176422 March2005 ICS25.160.40 Englishversion DestructivetestsonweldsinmetallicmaterialsColdcracking testsforweldmentsArcweldingprocessesPart2:Self restrainttests(ISO176422:2005) Essaisdestructifsdessouduressurmatriauxmtalliques Essaisdefissurationfroiddesassemblagessouds Procdsdesouda
9、gelarcPartie2:Essaissur prouvetteautobride(ISO176422:2005) ZerstrendePrfungvonSchweiverbindungenan metallischenWerkstoffenKaltrissprfungenfr SchweiungenLichtbogenschweiprozesseTeil2: SelbstbeanspruchendePrfungen(ISO176422:2005) ThisEuropeanStandardwasapprovedbyCENon9February2004. CENmembersareboundt
10、ocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuro
11、peanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus
12、,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKO
13、MITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO176422:2005:EEN ISO 17642-2:2005 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Desig
14、nation and symbols .5 5 Principle5 5.1 General5 5.2 Qualitative evaluation5 5.3 Quantitative evaluation .5 6 Test6 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
15、 Lehigh test (U-groove) 12 6.2.1 General12 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) Te
16、st 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 EN ISO 17642-2:2005 (E) 3 Foreword This document (EN ISO 17642-2:2005) has been prepared by Technical Committee CEN/TC 121 “
17、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 200
18、5, 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: Se
19、lf-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,
20、 Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN ISO 17642-2:2005 (E) 4 1 Scope This standard specifies the sizes of the test pieces, the specimens and the pro
21、cedures 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 al
22、loy 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
23、, 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 f
24、erritic 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
25、EN ISO 17642-1:2004 apply. EN ISO 17642-2:2005 (E) 5 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 vleg length vertical mm L Hleg length horizontal mm L length of the
26、 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 fcrack ratio for surface cracks % C rcrack ratio for root cracks % C scrack ratio for cracks in sections % l flength of surface crack mm l rlength of root crack
27、 mm H cheight root crack mm 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
28、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
29、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 perf
30、ormed. 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. EN ISO 17642-2:2005 (E) 6 6 Test
31、 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
32、 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
33、 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. EN ISO 17642-2:2005 (E) 7 Tabl
34、e 2 CTS test piece dimensions/conditions and tolerances Dimension/conditions Values Material thickness, t Top block 6 mm min. (75 1) mm x (75 1) mm x t Bottom block (250 3) mm x (100 3) mm x t Root notch depth gap (10 0,5) mm (1,6 0,10) mm Torque on bolt (100 5) Nm Surface finish on mating faces 3,2
35、 m R amax. Surface finish on area to be welded 6,3 m R amax. 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 circumstanc
36、es 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 th
37、e 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
38、 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 tor
39、que (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 materia
40、l yield strength of 895 N/mm. NOTE Where the yield strength of the parent material exceeds 895 N/mm, the consumable selected can have a yield strength less than that of the parent material (but greater than 895 N/mm) and /or austenitic stainless steel weld deposit can be used. Start and finish the a
41、nchor 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. EN ISO 17642-2:2005 (E) 8 Deposit the welds with a procedure to avoid hydrogen cracking, using preheat, inter
42、pass 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.
43、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 transfe
44、r 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 blo
45、cks 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 fu
46、ll 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 EN ISO 17642-2:2005 (E) 9 Determine the weld length by measuring from the start of
47、 the weld to the centre of the weld crater as shown in Figure 3. Calculate the value of heat input (in kJ/mm). NOTE Manual welding is difficult to control and monitor adequately. It is therefore recommended that mechanized deposition equipment is used. Figure 3 Measurement of weld length, L 6.1.4.3
48、Post-heating Where post-heating is to be carried out, transfer the assembly to an oven immediately following the completion of the first test welding. Monitor post-heating by using calibrated surface pyrometer or thermocouples. 6.1.4.4 Cooling Following deposition of the first test weld bead and after any post-heating treatment, transfer the test assembly to a cooling bath whereby the end of the assembly opposite the welded end is immerse
