BS EN ISO 3690-2012 Welding and allied processes Determination of hydrogen content in arc weld metal《焊接和相关工艺 电弧焊金属中氢含量的测定》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 3690:2012Welding and allied processes Determination of hydrogencontent in arc weld metal (ISO3690:2012)BS EN ISO 3690:2012 BRITISH STANDARDNational forewordThis British

2、 Standard is the UK implementation of EN ISO 3690:2012.It supersedes BS EN ISO 3690:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee WEE/39, Welding consumables.A list of organizations represented on this committee can beobtained on request to its s

3、ecretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 59123 5ICS 25.160.40; 77.080.20Compliance with a British Sta

4、ndard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3690 March 2012 ICS

5、25.160.40 Supersedes EN ISO 3690:2000English 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 verwandt

6、e Prozesse - Bestimmen des Wasserstoffgehaltes im Lichtbogenschweigut (ISO 3690:2012) 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

7、 national standard without any alteration. Up-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).

8、A version in any other language made by translation 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, Cyp

9、rus, 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, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDI

10、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3690:2012: EBS EN ISO 3690:2012EN ISO 3690:2012 (E)

11、3 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 national standard, either by publica

12、tion 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 patent rights. CEN and/or CENELE

13、C 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 European Standard: Austria, Belgium

14、, 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, Turkey and the United Kingdom. Endo

15、rsement notice The text of ISO 3690:2012 has been approved by CEN as a EN ISO 3690:2012 without any modification. BS EN ISO 3690:2012ISO 3690:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references 1 3 Principle . 1 4 Test procedures . 2 4.1 Production of w

16、eld specimens 2 4.2 Welding procedures for the production of weld specimens . 5 4.3 Measurement of hydrogen in the test weld 13 4.4 Measurement of total hydrogen content in the weld metal Rapid methods . 19 4.5 Rounding procedure . 19 Annex A (informative) Recommendations and restrictions in regard

17、to older methods of measurement using mercury . 20 Annex B (informative) Recommendations and restrictions in regard to older methods of measurement using glycerin 21 Annex C (informative) Accuracy and reproducibility 22 Bibliography 23 BS EN ISO 3690:2012ISO 3690:2012(E) iv ISO 2012 All rights reser

18、vedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which

19、a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matt

20、ers of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circul

21、ated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsib

22、le for identifying any or all such patent rights. ISO 3690 was prepared by International Institute of Welding, Commission II, Arc welding and filler metals, recognized as an international standardizing body in the field of welding in accordance with Council Resolution 42/1999, in collaboration with

23、Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 3, Welding consumables. This third edition cancels and replaces the second edition (ISO 3690:2000), which has been technically revised. Requests for official interpretations of any aspect of this International Standard shou

24、ld be directed to the ISO Central Secretariat, who will forward them to the IIW Secretariat for an official response. BS EN ISO 3690:2012INTERNATIONAL STANDARD ISO 3690:2012(E) ISO 2012 All rights reserved 1Welding and allied processes Determination of hydrogen content in arc weld metal 1 Scope This

25、 International Standard specifies the sampling and analytical procedure for the determination of 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 Interna

26、tional Standard include collection of diffusible hydrogen via displacement of mercury or collection 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

27、 latter. The temperature for collection of diffusible hydrogen is controlled to avoid thermal activation 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.

28、 For undated references, the latest edition of the referenced document (including any amendments) 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

29、for arc welding ISO 80000-1, Quantities and units Part 1: General 3 Principle Filler material is 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 contro

30、lled to prevent premature loss of hydrogen. Finally, the specimen is transferred to a gas collection 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 diffu

31、sible hydrogen into an evacuated gas burette or into the inert gas headspace, respectively. The amount 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 met

32、al enables calculations of diffusible hydrogen in deposited metal, HD, or diffusible hydrogen in fused weld metal, HF, to be made. BS EN ISO 3690:2012ISO 3690:2012(E) 2 ISO 2012 All rights reserved4 Test procedures 4.1 Production of weld specimens 4.1.1 Summary The welding consumable to be tested is

33、 used to deposit a single weld bead, which is rapidly quenched and subsequently stored at 78 C or lower until analysis. 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 proce

34、sses specified in 4.2 is shown in Figure 1. It is designed to hold the uniform test pieces securely in alignment during 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 sur

35、face temperature of the fixture shall be between ambient and 25 C above ambient at the start of each test weld. The fixture 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

36、test welds. For all welding processes, the test piece assembly is clamped in the welding fixture using annealed copper 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

37、 (10 % by volume) followed by washing with distilled water and drying. BS EN ISO 3690:2012ISO 3690:2012(E) ISO 2012 All rights reserved 3Dimensions 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 15 mm min. 300 mm)

38、 A copper B carbon steel Figure 1 Example of a suitable welding fixture and test piece assembly for weld deposits 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 no

39、t more than 0,02 % by mass. The assembly shall conform to the dimensions shown in Figure 2 for assembly A, assembly B, or assembly C, with a tolerance of 0,25 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 r

40、epresent minimum values. All surfaces shall be finished at right angles to ensure good 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

41、exercised to obtain proper clamping. See 4.1.4 d) for evidence of proper clamping. The 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 10 C for 1 h and cooled in either a dry inert g

42、as atmosphere or a vacuum. Alternatively, the test piece assembly may be degassed and 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

43、 numbering and removal of oxide, the mass, m1, of each centre test piece shall be determined to the nearest 0,1 g for assembly A or to the nearest 0,01 g for assembly B or assembly C. BS EN ISO 3690:2012ISO 3690:2012(E) 4 ISO 2012 All rights reservedKey a run-on piece of length lab run-off piece of

44、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 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 t

45、he specimen geometry according to AWS A4.3-935. Figure 2 Dimensions of the weld test assembly 4.1.4 Welding 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

46、 the fixture and test piece assembly, it is necessary to use cooling water thermostatically controlled to 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 tes

47、t piece assembly that is clamped in the welding fixture as shown in Figure 1. The test piece assembly shall 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

48、. The welding procedure is specified in steps a) to f). a) Welding shall be initiated on the run-on piece 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. b) Welding shall be terminated wh

49、en the trailing edge of the crater is on the run-off piece but shall not exceed a distance of 25 mm from the centre test piece. c) After extinction of the arc, the clamp shall be released and the test piece assembly removed and immersed at 4 s 1 s in an ice water bath. After 20 s 2 s, the test piece assembly shall be transferred and completely immersed in a low-temperature bath containing, for example, methanol and solid carbon BS EN ISO 3690:2012ISO 3690:2012(E) ISO 2012 All rights reserved 5dioxide, de