1、July 2012Translation by DIN-Sprachendienst.English price group 14No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25
2、.160.40!$=a“1902662www.din.deDDIN EN ISO 3690Welding and allied processes Determination of hydrogen content in arc weld metal (ISO 3690:2012);English version EN ISO 3690:2012,English translation of DIN EN ISO 3690:2012-07Schweien und verwandte Prozesse Bestimmung des Wasserstoffgehaltes im Lichtboge
3、nschweigut (ISO 3690:2012);Englische Fassung EN ISO 3690:2012,Englische bersetzung von DIN EN ISO 3690:2012-07Soudage et techniques connexes Dtermination de la teneur en hydrogne dans le mtal fondu pour le soudage larc(ISO 3690:2012);Version anglaise EN ISO 3690:2012,Traduction anglaise de DIN EN IS
4、O 3690:2012-07SupersedesDIN EN ISO 3690:2001-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 28 pages06.12 DIN EN ISO 3690:2012-07 2 A comma is used as the decimal marker. National foreword This standard has been prepared by the Inter
5、national Institute of Welding (IIW) and has been adopted as a European Standard by Technical Committee CEN/TC 121 “Welding” without any modification. The responsible German body involved in its preparation was the Normenausschuss Schweitechnik (Welding and Allied Processes Standards Committee), Join
6、t Committee NA Gemeinschaftsarbeitsausschuss NAS/NMP: Zerstrende Prfung von Schweiverbindungen (DVS AG Q 4/Q 4.1). In this standard, the unit “ppm” is used. It should, however, be noted that the Gesetz ber Einheiten im Messwesen (German Law on units in metrology) prohibits the use of the unit “ppm”
7、for official and commercial purposes in Germany. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 2560 DIN EN ISO 2560 ISO 14175 DIN EN ISO 14175 ISO/TR 17671-1 DIN EN 1011-1 Amendments This standard differs from DIN EN ISO 3690:2001-03
8、as follows: a) the welding fixture and specimen dimensions have been modified; b) the hot carrier gas extraction method has been included; c) Subclause 4.5 “Rounding procedure” has been included; d) the title and the content of International Standard ISO 3690:2012 are included in full. Previous edit
9、ions DIN 8572: 1968-04, 1977-12 DIN 8572-1: 1981-03 DIN 8572-2: 1981-03 DIN EN ISO 3690: 2001-03 National Annex NA (informative) Bibliography DIN EN 1011-1, Welding Recommendations for welding of metallic materials Part 1: General guidance for arc welding DIN EN ISO 2560, Welding consumables Covered
10、 electrodes for manual metal arc welding of non-alloy and fine grain steels Classification DIN EN ISO 14175, Welding consumables Gases and gas mixtures for fusion welding and allied processes EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3690 March 2012 ICS 25.160.40 Supersedes EN ISO 369
11、0:2000English Version Welding and allied processes - Determination of hydrogen content in arc weld metal (ISO 3690:2012) Soudage et techniques connexes - Dtermination de la teneur en hydrogne dans le mtal fondu pour le soudage larc (ISO 3690:2012) Schweien und verwandte Prozesse - Bestimmung des Was
12、serstoffgehaltes im Lichtbogenschweigut 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-
13、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 transl
14、ation 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
15、, 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. Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of ex
16、ploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3690:2012: EEUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG (ISO 3690:2012) Contents Page Foreword . 3 1 Scope . 4 2 Normative references 4 3 Prin
17、ciple 4 4 Test procedures . 5 4.1 Production of weld specimens . 5 4.2 Welding procedures for the production of weld specimens . 9 4.3 Measurement of hydrogen in the test weld . 16 4.4 Measurement of total hydrogen content in the weld metal Rapid methods . 22 4.5 Rounding procedure 22 Annex A (infor
18、mative) Recommendations and restrictions in regard to older methods of measurement using mercury 23 Annex B (informative) Recommendations and restrictions in regard to older methods of measurement using glycerin 24 Annex C (informative) Accuracy and reproducibility . 25 Bibliography 26 2DIN EN ISO 3
19、690:2012-07 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 natio
20、nal 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 p
21、atent 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 Euro
22、pean 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, Turk
23、ey 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. 3DIN EN ISO 3690:2012-07 EN ISO 3690:2012 (E) 1 Scope This International Standard specifies the sampling and analytical procedure for the determination of
24、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 collecti
25、on 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 act
26、ivation 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)
27、 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
28、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 collect
29、ion 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 a
30、mount 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, HD, or diffusible hydrogen in
31、fused weld metal, HF, to be made. 4DIN EN ISO 3690:2012-07 EN 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 analysi
32、s. 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 duri
33、ng 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 f
34、ixture 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 coppe
35、r 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. 5DIN EN ISO 3690:2012-07 EN ISO 3690:2012 (E)
36、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 u 15 mm min. u 300 mm) A copper B carbon steel Figure 1 Example of a suitable welding fixture and test piece assembly for weld deposits 6DIN EN ISO 3690:20
37、12-07 EN 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 Figur
38、e 2 for assembly A, assembly B, or assembly C, with a tolerance of r0,25 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
39、 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
40、 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 r 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 an
41、d 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, m1, of each centre test piece shall be de
42、termined to the nearest 0,1 g for assembly A or to the nearest 0,01 g for assembly B or assembly C. Key a run-on piece of length lab run-off piece of length lbc centre test piece of length lce test piece width t test piece thickness Dimensions in millimetres Test assembly laand lblce t Aa 25 (50) 80
43、 25 12 B 25 (50) 30 15 10 C 50 15 30 10la 25 mm and lb 25 mm: manual metal arc welding la 50 mm and lb 50 mm: other welding processes aComparable to the specimen geometry according to AWS A4.3-935. Figure 2 Dimensions of the weld test assembly 7DIN EN ISO 3690:2012-07 EN ISO 3690:2012 (E) 4.1.4 Weld
44、ing 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 t
45、o 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 sh
46、all 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 piec
47、e 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
48、 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 r 1 s in an ice water bath. After 20 s r 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 th
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