SIST EN 16725:2017
(Main)Railway applications - Track - Restoration and repair of manganese crossings
Railway applications - Track - Restoration and repair of manganese crossings
This European Standard specifies restoration of cast austenitic manganese steel for fixed crossings and cradles for crossings with movable parts, designed to be flash butt welded or bolted to adjoining rails manufactured according to EN 15689. The standard also applies to flash welded leg ends of austenitic manganese steel crossings and the associated tri-metal zone.
This standard describes the approval systems for consumables and procedures used in manual metal arc and flux cored metal deposit repair welding. The standard includes the quality-related tasks and responsibilities and qualifications of personnel involved in the electric arc repair welding of cast crossings.
The permitted welding processes are limited to Electric Arc (EA) in accordance with EN ISO 4063 and are by description Process No 111: MMA (Manual Metal Arc) and Process No 114: FCAW (self shielded tubular cored arc welding). Their applications are described.
This standard may be applied in situ, at line side or at out of track locations.
Bahnanwendungen - Oberbau - Instandsetzung und Reparatur von Herzstücken aus Manganhartstahlguss
Diese Europäische Norm legt die Aufarbeitung von fest angebrachten Herzstücken und Flügelschienen für Herzstücke mit beweglichen Teilen aus Manganhartstahlguss fest, die vorgesehen sind, durch Abbrenn-Stumpf¬schweißung mit den angrenzenden nach EN 15689 hergestellten Gleisschienen verschweißt oder verlascht zu werden. Die Norm gilt auch für abbrennstumpfgeschweißte Schienenenden von Herzstücken aus Mangan¬hartstahlguss und die zugehörige Trimetallzone.
Die Norm legt die Zulassungssysteme für Schweißzusatzwerkstoffe und Verfahren zur Ausführung von Reparaturschweißungen mit Anwendung von Lichtbogenhandschweißen und Schmelz-Fülldraht-schweißen fest. Diese Norm schließt die qualitätsbezogenen Aufgaben und Verantwortlichkeiten des Personals mit ein, das sich mit der Lichtbogenreparaturschweißung an Schienen befasst.
Die zulässigen Schweißverfahren sind auf das elektrische Lichtbogenschweißen (EA) nach EN ISO 4063, insbesondere auf die Verfahrens-Nr. 111: MMA (Lichtbogenhandschweißen – en: manual metal arc) und Verfahrens-Nr. 114: FCAW (Fülldraht-Lichtbogenschweißen – en: flux cored arc welding) begrenzt. Deren Anwendungen werden beschrieben.
Diese Norm kann auf Verfahren vor Ort, an der Strecke oder außerhalb von Gleisanlagen angewendet werden.
Die Zielsetzung dieser Norm ist die europaweite Vereinheitlichung der Aufarbeitung von Herzstücken aus Manganstahlguss durch Lichtbogenschweißen. Diese Norm behandelt Kontrollsysteme für die Zulassung und Qualifizierung von Schweißprozessen (Schweißvorgängen), Schweißanweisungen, Schweißzusatzwerk¬stoffen, Vertragsunter¬nehmen und Schweißern für die erfolgreiche Herstellung von Schweißungen an im Einsatz befindlichen Herzstücken.
Applications ferroviaires - Voie - Réparation des cœurs en acier au manganèse
La présente Norme européenne spécifie les exigences relatives à la réparation de l'acier austénitique moulé au manganèse utilisé pour les cœurs à pointe fixe et les berceaux de cœurs à parties mobiles, conçus pour être soudés par étincelage ou éclissés aux rails adjacents, fabriqués conformément à l'EN 15689. La norme s'applique également aux antennes soudées par étincelage des cœurs en acier austénitique au manganèse et à la zone trimétallique associée.La présente norme spécifie les procédures d’approbation relatives aux consommables et aux modes opératoires utilisés pour la réparation par soudage au moyen d’une électrode enrobée ou d’un fil fourré. La norme définit également les missions, responsabilités et qualifications du personnel impliqué dans la qualité des réparations de cœurs moulés par soudage à l’arc électrique.
Les procédés de soudage autorisés sont limités aux procédés de soudage à l'arc électrique (EA) conformément à l'EN ISO 4063 et particuilièrement au Procédé n° 111 : soudage manuel à l'arc avec électrode enrobée (MMA) et le Procédé n° 114 : soudage à l'arc avec fil fourré autoprotecteur (FCAW). Leurs applications sont décrites.
La présente norme peut être applicable in situ pour les procédures, en voie ou hors voie.
La présente norme a pour objectif d'unifier, à travers l'Europe, la réparation des cœurs en acier moulé au manganèse par soudage à l'arc électrique. La norme fournit les procédures d'approbation et de qualification des procédés de soudage, des modes opératoires de soudage, des consommables de soudage, des entreprises et des soudeurs pour l’obtention de réparations satisfaisantes de cœurs en service par soudage.
Železniške naprave - Zgornji ustroj proge - Obnova in popravilo kretniških src iz mangana
Ta evropski standard določa obnovo litega avstenitnega jekla iz mangana za nepremična kretniška srca in nosilce za kretniška srca s premičnimi deli, ki so oblikovani za sočelno varjenje z obžiganjem ali kovičenje na sosednje tirnice, izdelane v skladu s standardom EN 15689. Standard se uporablja tudi za zaključke kretniških src iz avstenitnega manganovega jekla, ki so uporovno varjeni z obžiganjem, in povezano trikovinsko območje. Ta standard opisuje sisteme odobritve za dodajne materiale in postopke, ki se uporabljajo pri ročnem obločnem varjenju in reparaturnem varjenju zvarov, izpolnjenih s talilom. Standard vključuje s kakovostjo povezana opravila in odgovornosti ter usposobljenost osebja, povezanega z električnim obločnim reparaturnim varjenjem litih kretniških src. Dovoljeni postopki varjenja so omejeni na električne obloke (EA) v skladu s standardom EN ISO 4063 in so opisani v postopku št. 111: MMA (ročno obločno varjenje) in postopku št. 114: FCAW (varjenje s stržensko žico z lastnim ščitom). Opisane so vrste njihove uporabe. Ta standard se lahko uporablja na mestu samem, ob progi ali na mestih zunaj proge.
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Železniške naprave - Zgornji ustroj proge - Obnova in popravilo kretniških src iz manganaBahnanwendungen - Oberbau - Instandsetzung und Reparatur von Herzstücken aus ManganhartstahlgussApplications ferroviaires - Voie - Réparation des cœurs en acier au manganèseRailway applications - Track - Restoration and repair of manganese crossings93.100Gradnja železnicConstruction of railways45.080Rails and railway componentsICS:Ta slovenski standard je istoveten z:EN 16725:2016SIST EN 16725:2017en,fr,de01-januar-2017SIST EN 16725:2017SLOVENSKI
STANDARD
SIST EN 16725:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16725
November
t r s x ICS
{ uä s r r English Version
Railway applications æ Track æ Restoration and repair of manganese crossings Applications ferroviaires æ Voie æ Réparation des cœurs en acier au manganèse
Bahnanwendungen æ Oberbau æ Instandsetzung und Reparatur von Herzstücken aus ManganhartstahlgussThis European Standard was approved by CEN on
t t July
t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x y t wã t r s x ESIST EN 16725:2017
EN 16725:2016 (E) 2 Contents Page European foreword . 4 Introduction . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 7 4 Consumable and WPS approval tests for MMA electrodes and FCAW wires . 8 4.1 General . 8 4.2 Consumable and WPS approval model . 8 4.2.1 Flow chart . 8 4.2.2 Minimum information to be included in the pWPS . 9 4.3 Information supplied by the manufacturer of the welding consumable to the certifying body . 10 4.4 Laboratory examinations of weld samples . 11 4.5 Description of the samples for laboratory test for resurfacing work . 11 4.5.1 General requirements for laboratory tests . 11 4.5.2 Single bead on AMS . 11 4.5.3 Multi-layer on AMS . 12 4.5.4 Single bead on tri-metal zone . 13 4.5.5 Single layer on tri-metal zone . 13 4.5.6 Multi-layer on tri-metal zone . 14 4.5.7 Preparation and examination of AMS samples . 15 4.5.8 Preparation and examination of the tri-metal zone samples . 16 4.6 Assessment of general weldability . 18 4.7 Acceptance criteria . 18 4.7.1 Visual inspection . 18 4.7.2 PT examination . 18 4.7.3 Hardness . 18 4.7.4 Macro and micro examination of single and multi-layer sections . 19 4.8 Track trial tests . 19 4.8.1 General . 19 4.8.2 Excavation detail for track trials . 19 4.8.3 Track trial test categories . 20 4.8.4 Test methods . 20 4.8.5 Number of in-track test samples . 20 4.8.6 Welder’s report from track trials . 20 4.8.7 Acceptance criteria for track trial tests . 20 4.9 Evaluation, reporting and decision following track trials . 21 4.9.1 General . 21 4.9.2 List of general information . 21 4.9.3 Track trial tests inspection records . 21 4.9.4 Decision by approving RA on consumable and WPS . 21 4.10 Validation of consumables . 21 5 Approval of contractors . 22 5.1 Quality management systems . 22 5.2 Inspection and testing . 22 SIST EN 16725:2017
EN 16725:2016 (E) 3 5.3 Subcontracting . 22 5.4 Equipment . 22 5.5 Welding activities . 22 5.6 Storage and handling of welding consumables. 22 5.7 Care of the infrastructure . 22 5.8 Welding procedure specifications . 23 5.9 Pre-heating of rails when welding in tri-metal zone . 23 5.10 Welders . 23 5.11 Welder records . 23 5.12 Supervision . 23 5.13 Traceability . 23 5.14 Audits . 23 5.15 Training . 23 5.16 Documentation . 24 6 Personnel and qualification requirements . 24 6.1 Training and qualification requirements . 24 6.2 Diploma in electric arc welding of cast manganese track components . 24 6.3 Permit to weld cast manganese components in track . 24 7 Repair applications . 25 Annex A (informative)
Welding Procedure Specification (WPS) . 26 Annex B (informative)
Permit to weld cast manganese track components by electric arc welding . 28 SIST EN 16725:2017
EN 16725:2016 (E) 4 European foreword This document (EN 16725:2016) has been prepared by Technical Committee 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 May 2017, and conflicting national standards shall be withdrawn at the latest by May 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 has been prepared under a mandate given to CEN by the 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, Estonia, Finland, Former Yugoslav Republic of Macedonia, 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. SIST EN 16725:2017
EN 16725:2016 (E) 5 Introduction Restoration of cast manganese crossings by electric arc welding is a special process requiring the co-ordination of welding and grinding activities to establish confidence and reliability of the weld deposit and safety of the line. Incorrect selection of materials, consumables or procedure may result in serious track welding failure. The correct application of the approved processes and the types of repairs permitted to be carried out on various rail components need to be strictly adhered to. Only consumables approved by the method described in this standard are to be used. The tasks and responsibilities of personnel involved in restoration e.g. planning, executing, supervising and inspection need to be clearly defined. SIST EN 16725:2017
EN 16725:2016 (E) 6 1 Scope This European Standard specifies restoration of cast austenitic manganese steel for fixed crossings and cradles for crossings with movable parts, designed to be flash butt welded or bolted to adjoining rails manufactured according to EN 15689. The standard also applies to flash welded leg ends of austenitic manganese steel crossings and the associated tri-metal zone. The standard specifies the approval systems for consumables and procedures used in manual metal arc and flux cored metal deposit repair welding. The standard includes the quality-related tasks and responsibilities and qualifications of personnel involved in the electric arc repair welding of cast crossings. The permitted welding processes are limited to Electric Arc (EA) in accordance with EN ISO 4063, specifically Process No 111: MMA (Manual Metal Arc) and Process No 114: FCAW (Flux Cored Arc Welding). Their applications are described. This standard may be applied for procedures in situ, at line side or at out of track locations. The purpose of this standard is to unify restoration of cast manganese crossings by electric arc welding across Europe. The standard provides control systems for the approval and qualification of welding processes, WPS, welding consumables, contractors and welders for the successful delivery of welds on crossings in service. 2 Normative references 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 1371-1, Founding - Liquid penetrant testing- Part 1: Sand, gravity die and low pressure die castings EN 13674-1, Railway applications - Track - Rail - Part 1: Vignole railway rails 46 kg/m and above EN 15689, Railway applications - Track - Switches and crossings - Crossing components made of cast austenitic manganese steel EN ISO 544, Welding consumables - Technical delivery conditions for filler materials and fluxes - Type of product, dimensions, tolerances and markings (ISO 544) EN ISO 2560, Welding consumables — Covered electrodes for manual metal arc welding of non-alloy and fine grain steels — Classification (ISO 2560) EN ISO 3452-1, Non-destructive testing - Penetrant testing - Part 1: General principles (ISO 3452-1) EN ISO 4063, Welding and allied processes - Nomenclature of processes and reference numbers (ISO 4063) EN ISO 5817, Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections (ISO 5817) EN ISO 6507-1, Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1) EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules (ISO 15607) EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials - Welding procedure specification - Part 1: Arc welding (ISO 15609-1) SIST EN 16725:2017
EN 16725:2016 (E) 7 EN ISO 15613, Specification and qualification of welding procedures for metallic materials - Qualification based on pre-production welding test (ISO 15613) EN ISO 17632, Welding consumables - Tubular cored electrodes for gas shielded and non-gas shielded metal arc welding of non-alloy and fine grain steels - Classification (ISO 17632) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Railway Authority RA either the railway regulator or the owner of a railway infrastructure or the custodian with a delegated responsibility for a railway infrastructure 3.2 contractor and sub-contractor company approved by a railway authority to carry out the restoration of cast manganese track components by electric arc welding on that particular infrastructure Note 1 to entry: This may include staff from within the RA 3.3 preliminary welding procedure specification pWPS tentative welding procedure specification, which is assumed to be adequate by the consumable manufacturer, but which has not been approved by the RA Note 1 to entry: Welding of test pieces needed for approval of a welding procedure specification has to be carried out on the basis of a preliminary welding procedure specification. 3.4 welding procedure specification WPS procedure approved to European standards and agreed by the RA for use on the railway infrastructure 3.5 training establishment welder training organisation or centre approved by the railway authority or alternatively a welder training organisation or centre approved by and belonging to a railway authority 3.6 manual metal-arc welding MMA manually operated metal-arc welding using a covered electrode 3.7 flux-cored arc welding FCAW semi-automatic or automatic arc welding process Note 1 to entry: FCAW requires a continuously fed consumable tubular electrode containing a flux and a constant-voltage or a constant-current welding power supply. SIST EN 16725:2017
EN 16725:2016 (E) 8 3.8 certification body body for the purpose of witnessing and reporting the welding and testing of test pieces 3.9 AMS austenitic manganese steel, in accordance with EN 15689 3.10 penetrant testing PT method of crack detection employing capillary action. A low surface tension liquid is applied to a test area, after a given soak time a powder developer is applied, the developer draws the liquid from any cracks present giving a clear indication of any surface breaking defect 3.11 tri-metal zone flash butt welded area of the casting containing AMS, rail steel and the stainless steel insert 3.12 million gross tonnes (MGT) Equivalent Million Gross Tonnes Per Annum (EMGTPA) annual traffic load (metric for assigning track category) 4 Consumable and WPS approval tests for MMA electrodes and FCAW wires 4.1 General The approval of consumables and the related WPS is broadly in line with the requirements of EN ISO 15613, but owing to the special nature of the repair weld in terms of steel grades, the approval process shall follow this standard. 4.2 Consumable and WPS approval model 4.2.1 Flow chart The following flow chart describes how a consumable and its related WPS shall be approved. WPS approval shall follow the principle of EN ISO 15613 approval by a pre-production test. SIST EN 16725:2017
EN 16725:2016 (E) 9
NOTE 1 The approving RA has to issue an approval certificate upon successful outcome of track trial. NOTE 2 Other RAs may require further tests to verify suitability for special service/operational conditions or deposition techniques. Figure 1 — WPS approval 4.2.2 Minimum information to be included in the pWPS The pWPS shall contain as a minimum the following: — Parent material; — Consumable classification type and size; SIST EN 16725:2017
EN 16725:2016 (E) 10 — Welding process; — Methods of preparation and cleaning; — Current (A); — Arc Voltage (V); — Type of Current (AC/DC); — Polarity; — Travel Speed (mm/min); — Deposition sequence – direction of welding; — Heat input (kJ/mm); — Welding position; — Excavation details (sketch); — Temperature measurement points (sketch); — Maximum or minimum temperature values at measurement points; — Interpass temperature at measurement points; — Peening details. 4.3 Information supplied by the manufacturer of the welding consumable to the certifying body — Toxicity threshold levels; — Applicable steel grades in accordance with EN 15689 and/or EN 13674-1; — Electrode classification in accordance with EN ISO 2560 for MMA and EN ISO 17632 for FCAW; — Chemical analysis and batch analysis; — Storage requirements with manufacturer’s recommendations; — Current range/voltage range/polarity; — Open Circuit Voltage (OCV) requirements; — Availability of vacuum sealed MMA electrodes; — Dimensions, length and diameter; — FCAW spool size/weight/winding pattern availability; — Drying requirements; SIST EN 16725:2017
EN 16725:2016 (E) 11 — Description of marking system; — Deposition technique; — Hardness in the as welded condition and after work hardening. 4.4 Laboratory examinations of weld samples The certifying body shall confirm compliance with this standard and record results of laboratory tests: — Visual inspection (VT) accordance with EN ISO 5817; — Penetrant test (PT) in accordance with EN ISO 3452-1; — Hardness; — Macro and micro examination. 4.5 Description of the samples for laboratory test for resurfacing work 4.5.1 General requirements for laboratory tests The excavation shall be inspected by PT according to EN 1371-1 acceptance level SP1. The following requirements are valid for laboratory tests: — single bead on AMS: one sample required; — single bead on tri-metal zone: one sample required; — single layer on tri-metal zone: one sample required; — multi-layers on AMS: one sample required; — multi-layers on tri-metal zone: one sample required; — deposits to be made in the flat (PA) position. The samples shall be from used crossings including the tri-metal zone with materials cast, welded, heat treated, machined and inspected by the same method used for production pieces, or samples from new materials as agreed by the RA. Single bead and multi-layer deposits can be made on the same sample. 4.5.2 Single bead on AMS 4.5.2.1 Purpose This test is used to demonstrate the consumable’s compatibility with welding of AMS before carrying out further detailed tests and allows assessment of continuous deposition of electrodes used. 4.5.2.2 Description The sample shall normally be taken from an AMS crossing. In certain cases the sample may be purpose made in agreement with the RA. The welded bead for MMA shall be done for a maximum electrode recovery using the manufacturer’s parameters. SIST EN 16725:2017
EN 16725:2016 (E) 12 In the case of FCAW a minimum length of 400 mm shall be welded. The AMS sample shall have a minimum length of weld bead +200 mm (100 mm on each end of the weld bead), and shall be deposited on the wheel-rail contact area of a sample from a used crossing with a surface cleaned by grinding. 4.5.2.3 Examination and assessment The deposit shall be cleaned removing all slag and spatter and then it shall be examined visually in the as-welded condition. Following visual examination the bead shall be ground until 0,5 mm – 0,8 mm remains above the sample surface. Following grinding the deposit shall be examined using visual and PT method. PT shall be carried out in accordance with EN ISO 3452-1. The deposit shall be assessed in accordance with 4.7.1 and 4.7.2. If the weld deposit fails visual or PT examination, the test shall be terminated. The approval of this pWPS for welding AMS shall be declined. 4.5.3 Multi-layer on AMS 4.5.3.1 Purpose The purpose of this test is to determine the integrity of the multi-layer weld metal and the parent material. 4.5.3.2 Description The sample shall normally be taken from an AMS crossing “leg end”. In certain cases, the sample may be purpose made in agreement with the RA. The AMS crossing sample shall be a minimum length of 600 mm and prepared in accordance with Figure 2. The minimum depth of the excavation shall be 8 mm from the running surface, the minimum number of layers shall be 3.
Key D depth of excavation
8 mm S in accordance with the pWPS L
50 mm Figure 2 — Excavation details leg-ends The dimension D shall be such that the surface of the final layer is level with the surface of the parent rail. The transverse excavation for trials shall be minimum 50 % of the railhead width. The layers shall be deposited on the wheel-rail contact area of a sample from a used crossing with a surface cleaned by grinding. 4.5.3.3 Examination and assessment The deposit shall be cleaned removing all slag and spatter and then it shall be examined visually in the as-welded condition. SIST EN 16725:2017
EN 16725:2016 (E) 13 Following visual examination, the deposit shall be ground to head profile. Afterwards the deposit shall be examined using visual and PT methods. PT shall be carried out in accordance with EN ISO 3452-1. The deposit shall be assessed in accordance with 4.7.1 and 4.7.2. If the weld deposit fails visual or PT examination, the test shall be terminated. The approval of this pWPS shall be declined. If visual inspection and PT examination is successful, the deposit shall be sectioned, prepared and subjected to macro and micro examination in accordance with 4.7.4. 4.5.4 Single bead on tri-metal zone 4.5.4.1 Purpose This test is used to demonstrate the consumable’s compatibility with welding of the tri-metal zone before carrying out further detailed tests. This test also allows assessment of continuous deposition of electrodes used. 4.5.4.2 Description The sample shall be a minimum of 150 mm long at the AMS side and a minimum of 600 mm long at the rail steel side. This is to facilitate heat input management. The welded bead shall be deposited such that 70 mm minimum is on the rail steel side and 30 mm minimum is on the AMS side. The bead shall be deposited on the wheel-rail contact area of a sample from a used crossing with a surface cleaned by grinding. 4.5.4.3 Examination and assessment The deposit shall be cleaned removing all slag and spatter and then it shall be examined visually in the as-welded condition. Following visual examination the bead shall be ground until 0,5 mm – 0,8 mm remains above the sample surface. Following grinding the deposit shall be examined using visual and PT method. PT shall be carried out in accordance with EN ISO 3452-1. The deposit shall be assessed in accordance with 4.7.1 and 4.7.2. If the weld deposit fails visual or PT examination, the test shall be terminated. The approval of this pWPS for welding tri-metal zone shall be declined. 4.5.5 Single layer on tri-metal zone 4.5.5.1 Purpose The purpose of this test is to establish the effects of dilution on a single layer and to check the integrity of the deposit and the parent material. 4.5.5.2 Description The sample shall be a minimum of 150 mm long at the AMS side and a minimum of 600 mm long at the rail steel side. This is to facilitate heat input management and to permit examination of the parent materials. The welded layer shall be deposited such that 70 mm minimum is on the rail steel side and 30 mm minimum is on the AMS side. The layer shall be deposited on the wheel-rail contact area of a sample from a used crossing with a surface cleaned by grinding. 4.5.5.3 Examination and assessment The deposit shall be cleaned removing all slag and spatter and then it shall be examined visually in the as-welded condition. SIST EN 16725:2017
EN 16725:2016 (E) 14 Following visual examination the layer shall be ground until smooth leaving 0,5 mm to 0,8 mm above the sample surface. Following grinding the deposit shall be examined using visual and PT method. PT shall be carried out in accordance with EN ISO 3452-1. The deposit shall be assessed in accordance with 4.7.1 and 4.7.2. If the weld deposit fails visual or PT examination, the test shall be terminated. The approval of this pWPS shall be declined. If visual inspection and PT examination is successful, the deposit shall be sectioned, prepared and subjected to metallography in accordance with 4.7.1. All results shall be assessed in accordance with 4.7.4. 4.5.6 Multi-layer on tri-metal zone 4.5.6.1 Purpose The purpose of
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.