DIN EN 14730-1-2017 en 1278 Railway applications - Track - Aluminothermic welding of rails - Part 1 Approval of welding processes German version EN 14730-1 2017《轨道交通 轨道 铁轨的铝热剂焊接 第1.pdf

1、June 2017 English price group 18No 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 25.160.10; 93.100!%g$“2680193www.di

2、n.deDIN EN 14730-1Railway applications Track Aluminothermic welding of rails Part 1: Approval of welding processes;English version EN 147301:2017,English translation of DIN EN 14730-1:2017-06Bahnanwendungen Oberbau Aluminothermisches Schweien von Schienen Teil 1: Zulassung der Schweiverfahren;Englis

3、che Fassung EN 147301:2017,Englische bersetzung von DIN EN 14730-1:2017-06Applications ferroviaires Voie Soudage des rails par aluminothermie Partie 1: Approbation des procds de soudage;Version anglaise EN 147301:2017,Traduction anglaise de DIN EN 14730-1:2017-06SupersedesDIN EN 147301:201012www.beu

4、th.deDocument comprises 44 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.06.17 DIN EN 14730-1:2017-06 2 A comma is used as the decimal marker. National foreword This document has been prepared by Technical Committee CEN/TC 25

5、6 “Railway applications” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Fahrweg und Schienenfahrzeuge (DIN Standards Committee Railway), Subcommittee NA 087-00-01-01 UA “Welding of rails”. This standard is based on the English reference v

6、ersion. Amendments This standard differs from DIN EN 14730-1:2010-12 as follows: a) Clause 4 “Information to be supplied by the railway authority” has been revised; b) Table 1 “Rail profile groups” has been revised and “Group 4” has been deleted; c) Figure 2 “Ground collar surface” has been deleted;

7、 d) Table 5 “Ranges for running surface hardness tests” and Table 7 “Chemical composition” have been revised and extended by rail grades R370CrHT and R400HT; e) Annex C “Ultrasonic inspection procedure on aluminothermic welds to be sectioned” has been revised, details on the setup for testing have b

8、een deleted and the Annex has been included as new Annex G; f) Annex E “Procedure for measurement” has been included as Annex D; g) Annex J “Fatigue test methods for aluminothermic welds” has been revised and calibration procedures have been deleted; h) the standard has been editorially revised. Pre

9、vious editions DIN EN 14730-1: 2006-10, 2010-12 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14730-1 March 2017 ICS 25.160.10; 93.100 Supersedes EN 14730-1:2006+A1:2010English Version Railway applications - Track - Aluminothermic welding of rails - Part 1: Approval of welding processes Appli

10、cations ferroviaires - Voie - Soudage des rails par aluminothermie - Partie 1: Approbation des procds de soudage Bahnanwendungen - Oberbau - Aluminothermisches Schweien von Schienen - Teil 1: Zulassung der Schweiverfahren This European Standard was approved by CEN on 13 August 2016. CEN members are

11、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-to-date lists and bibliographical references concerning such national standards may be obtained on application to th

12、e 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Cent

13、re 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuani

14、a, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 1

15、7, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14730-1:2017 E2 Contents Page European foreword . 5 Introduction 6 1 Scope 7 2 Normative references 7 3 Terms and definitions . 7 4 Information to be supplied

16、by the railway authority. 8 5 Approval procedure . 8 5.1 General 8 5.2 Process identification 8 5.3 General requirements . 9 5.4 Documents to be submitted with the request for approval . 9 5.4.1 The process manual . 9 5.4.2 Drawing with the required measurements 10 Figure 1 Dimensions taken from mou

17、ld pattern . 10 5.4.3 Chemical analysis ranges and tolerances 11 5.5 Initial compliance testing 11 Table 1 Rail profile groups 11 Table 2 Testing scheme . 11 5.6 Extension of initial compliance testing 12 5.7 Preparation and allocation of test welds . 12 6 Re-approval following process changes 13 6.

18、1 Changes requiring approval . 13 6.1.1 Geometric parameters . 13 6.1.2 Crucible system . 13 6.1.3 Tapping system . 13 6.1.4 Pre-heating system 13 6.1.5 Portion . 13 6.1.6 Welding gap 14 6.2 Test requirements for re-approval following process changes 14 Table 3 process changes 15 7 Laboratory tests

19、17 7.1 Visual surface examination 17 7.1.1 As-cast weld surface 17 Table 4 Maximum dimensions of slag or sand defects 17 7.1.2 Ground weld surface . 17 7.1.3 Visible heat affected zone 17 7.2 Running surface hardness test 17 Table 5 Ranges for running surface hardness tests 18 7.3 Slow bend test . 1

20、8 7.4 Internal examination 18 7.4.1 Weld soundness 18 EN 14730-1:2017 (E) DIN EN 14730-1:2017-06 3 Figure 2 Transverse section of head, web and foot of the rail 19 Figure 3 Sectioning of Welds . 20 7.4.2 Fusion zone Shape and dimension 21 Figure 4 Shape of fusion zone on the etched longitudinal vert

21、ical section 21 7.4.3 Fusion zone . 21 7.4.4 Heat softened zone width 22 Table 6 Ranges of heat softened zone 22 7.5 Fatigue test 22 7.6 Chemical analysis . 22 Table 7 Chemical composition 23 Annex A (informative) Steps in approval 24 Annex B (informative) Suggested sequence of laboratory test . 25

22、Annex C (normative) Procedure for Fry etching 26 Annex D (informative) Procedure for measurement of surface hardness 27 Figure D.1 Location of surface hardness tests . 27 Annex E (normative) Procedure for slow bend test 28 Figure E.1 Slow bend test schematic . 28 Annex F (normative) Procedure for re

23、cording test weld fracture face defects 29 Figure F.1 Rail profile grid . 30 Annex G (normative) Ultrasonic inspection procedure on aluminothermic welds to be sectioned 31 G.1 General . 31 G.2 Test equipment 31 G.3 Preparation of samples 31 G.4 Adjustment 31 G.5 Testing 32 G.6 Reporting . 32 Annex H

24、 (normative) Procedure for microscopic examination of the visible heat affected zone and fusion zone of welds . 33 Figure H.1 Scheme for taking samples for microscopic examination 33 Annex I (normative) Procedure for measurement of the heat softened zone width 34 I.1 Measurement of hardness . 34 Fig

25、ure I.1 Longitudinal hardness measurement 34 I.2 Evaluation of hardness data . 34 I.2.1 General . 34 Figure I.2 Typical hardness profile . 35 I.2.2 Mean hardness of parent rail . 35 I.2.3 Measurement hardness line . 35 EN 14730-1:2017 (E) DIN EN 14730-1:2017-06 4 I.2.4 Heat softened zone width measu

26、rement . 35 I.2.5 Parent rail hardness variation 35 Annex J (normative) Fatigue test methods for aluminothermic welds . 36 J.1 General . 36 J.2 Test equipment . 36 Figure J.1 Fatigue test arrangement . 36 J.3 Calibration procedure 37 J.4 Fatigue test results 37 J.4.1 General . 37 J.4.2 Staircase tes

27、ting method . 37 J.4.2.1 Test pieces 37 J.4.2.2 Procedure 37 J.4.2.3 Data analysis 38 J.4.2.4 Acceptance criteria 39 J.4.3 Example of the data analysis of a fatigue strength determination by the staircase method . 39 Table J.1 Experimental results . 39 J.4.4 Past-the-post testing method . 40 J.4.4.1

28、 Test pieces 40 J.4.4.2 Procedure 40 J.4.4.3 Information to be reported 40 J.4.4.4 Acceptance criterion . 40 Annex K (informative) Adeviations 41 Bibliography . 42 EN 14730-1:2017 (E) DIN EN 14730-1:2017-06 5 European foreword This document (EN 14730-1:2017) has been prepared by Technical Committee

29、CEN/TC 256 “Railway applications”, the secretariat of which is held by DIN. 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 2017, and conflicting national standards shall be withdrawn at

30、 the latest by September 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14730-1:2006+A1:2010. The European Standar

31、d EN 14730 “Railway applications Track Aluminothermic welding of rails” is composed of two parts: Part 1: Approval of welding processes Part 2: Qualification of aluminothermic welders, approval of contractors and acceptance of welds This document has been prepared under a mandate given to CEN by the

32、 European Commission and the European Free Trade Association. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estoni

33、a, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. EN 14730-1:2017 (

34、E) DIN EN 14730-1:2017-06 6 Introduction This standard defines the approval procedure for aluminothermic welding processes for rail welding through laboratory tests of welds produced in a workshop. This laboratory approval will provide the railway authority with sufficient information for tests in t

35、he track if required. EN 14730-1:2017 (E) DIN EN 14730-1:2017-06 7 1 Scope This European Standard defines the laboratory tests and requirements for approval of an aluminothermic welding process using welds produced in workshop conditions. It applies to the joining of new Vignole rails as described i

36、n EN 13674-1 of the same profile and steel grade. Compliance with the requirements of this standard does not of itself ensure the suitability of a welding process for specific conditions of track and traffic. The standard does not cover welds made between different rail sections, differently worn ra

37、ils and different rail grades. In addition to the definitive requirements this standard also requires the items detailed in Clause 4 to be documented. For compliance with this standard, it is important that both the definitive requirements and the documented items be satisfied. 2 Normative reference

38、s The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13

39、674-1, Railway applications - Track - Rail - Part 1: Vignole railway rails 46 kg/m and above EN ISO 6506-1, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2014) EN ISO 6507-1, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2005) EN ISO 9712

40、, Non-destructive testing - Qualification and certification of NDT personnel (ISO 9712:2012) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 fusion zone area of the weld which has been in a liquid state and which is revealed by etching sectio

41、ns cut through the weld 3.2 visible heat-affected zone areas on either side of the fusion zone within which rail steel microstructure has been visibly modified by the heat of the welding process as revealed by Fry macro-etching 3.3 heat softened zone part of the Heat Affected Zone (HAZ) characterise

42、d by a lower hardness 3.4 weld collar external profile of the as-cast weld metal that remains after removal of the moulds EN 14730-1:2017 (E) DIN EN 14730-1:2017-06 8 3.5 flashing flat fin of weld metal located on the rail surface adjacent to the weld collar caused by gaps between the mould and the

43、rail 3.6 surface defect any defect visible on the weld surface after normal finishing operations 3.7 internal defect any defect that is revealed by sectioning or on a fracture face following bend or fatigue testing that has not already been identified as a surface defect 3.8 stress range stress rang

44、e for the fatigue test is the maximum stress minus minimum stress 3.9 railway authority either the railway regulator or the owner of a railway infrastructure or the custodian with a delegated responsibility for a railway infrastructure 3.10 process supplier company which provides an aluminothermic w

45、elding process in accordance with this standard and which is approved by the railway authority to supply consumables and tools for the execution of aluminothermic welds 4 Information to be supplied by the railway authority The following information shall be fully documented by the railway authority.

46、 For compliance with the standard both the definitive requirements specified throughout the standard and the following documented items shall be satisfied. a) Pre-heating shall comply with any limitations of the railway authority. b) Which of the width levels of heat-softened zone is required (7.4.4

47、). c) The fatigue test, if required by the railway authority, either past the post or staircase method, shall be carried out in accordance to Annex J and to the requirements as specified in 7.5. 5 Approval procedure 5.1 General An outline of the steps required for compliance to this standard is give

48、n in informative Annex A. 5.2 Process identification The approval shall involve a single process identified by: a) The process name. b) A drawing of the pouring system. EN 14730-1:2017 (E) DIN EN 14730-1:2017-06 9 c) The characteristic geometry of the weld collar and riser configuration as given in

49、5.4.2 and Figure 1. d) The process manual in accordance with 5.4.1. 5.3 General requirements The following requirements shall be met. The process shall be capable of being carried out on track where the maximum cant can be 180 mm. It shall be capable of being carried out in track, at or near trackside or in a workshop. The aluminothermic welding portion shall be packed to avoid the risk of moisture contamination in prescribed s