TB/T 1632.3-2019 (TB/T 1632.3-2014) PDF EnglishUS$140.00 · In stock · Download in 9 seconds
TB/T 1632.3-2014: Welding of rails - Part 3: Thermit welding Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Obsolete TB/T 1632.3: Historical versions
Similar standardsTB/T 1632.3-2014: Welding of rails - Part 3: Thermit welding---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/TBT1632.3-2014TB RAILWAY INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 45.120 S 17 Replacing TB/T 1632.3-2005 Welding of rails - Part 3.Thermit welding Issued on: OCTOBER 30, 2014 Implemented on: MAY 1, 2015 Issued by. National Railway Administration of the People’s Republic of China Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Requirements... 5 4 Inspection methods... 9 5 Inspection rules... 11 Annex A (Informative) Operation records for thermit welding of rails... 15 Annex B (Normative) Measurement method for width of softened zone... 16ForewordTB/T 1632 Welding of rails is divided into four parts. — Part 1.General specification; — Part 2.Flash butt welding; — Part 3.Thermit welding; — Part 4.Gas pressure welding. This Part is Part 3 of TB/T 1632. This Standard was drafted in accordance with the provisions given in GB/T 1.1- 2009. This Part replaces TB/T 1632.3-2005 Welding of rails - Part 3.Thermit welding. Compared with TB/T 1632.3-2005, the major technical changes are as follows. — MODIFY the material requirements for thermit welding (SEE 3.2 in this edition and 3.2 in 2005 edition); — MODIFY the personnel requirements for thermit welding (SEE 3.3 in this edition and 3.3 in 2005 edition); — ADD the storage requirements and shelf lives of the flux and sand mold that shall be included in the process manual (SEE 3.4 in this edition); — CANCEL the requirement for the percentage elongation after fracture, A ≥ 2.0%; CANCEL the requirement for the impact properties, KU2 ≥ 6.0J; CANCEL the description that no delivery conditions are made for the percentage elongation after fracture, A, and the impact energy, KU2 (SEE 3.5 in this edition and 3.5 in 2005 edition); — MODIFY the inspection method (SEE Chapter 4 in this edition and Chapter 4 in 2005 edition); — CANCEL the impact test in the test method (SEE 4.6 in 2005 edition); — MODIFY the inspection rules (SEE Chapter 5 in this edition and Chapter 5 in 2005 edition). This Part was proposed by and shall be under the jurisdiction of the Standards and Metrology Institute of the Ministry of Railways. Welding of rails - Part 3.Thermit welding1 ScopeThis Part of TB/T 1632 specifies the requirements, inspection methods and inspection rules for the thermit welding of rails. This Part is applicable to the thermit welding of 50 kg/m ~ 75 kg/m rails.2 Normative referencesThe following documents are essential to the application of this document. For dated references, only the editions with the dates indicated are applicable to this document. For undated references, only the latest editions (including all the amendments) are applicable to this document. GB/T 230.1-2009 Metallic materials - Rockwell hardness test - Part 1.Test method (scales A, B, C, D, E, F, G, H, K, N, T) GB/T 231.1-2009 Metallic materials - Brinell hardness test - Part 1.Test method GB/T 4340.1-2009 Metallic materials - Vickers hardness test - Part 1.Test method GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 13298 Inspection methods of microstructure for metals TB/T 1632.1-2014 Welding of rails - Part 1.General specification TB/T 3322-2013 Alumino-thermic welding consumables for rail3 Requirements3.1 Welding rail requirements The new rails for thermit welding shall meet the requirements of Chapter 4 in TB/T 1632.1-2014. 3.2 Welding material requirements The materials for thermit welding of rails shall meet the requirements of TB/T 3322-2013. 3.3 Personnel requirements Each welding operator shall hold a job training certificate issued by the technical institution approved by the railway authority. 3.4 Process requirements 3.4.1 Welding process 3.4.1.1 The thermit welding process shall be implemented according to the process manual provided by the supplier. 3.4.1.2 The supplier shall specify the required equipment, consumable materials and detailed method of operation in the manual. The following contents shall also be included. a) number of main operators; b) instructions for welding equipment; c) flux corresponding to the rails of different grades and models; d) preparation of rail ends and rail gap size; e) detailed preheating parameters; f) time range from the ignition of the flux to the casting of the molten steel; g) the temperature at which the train is allowed to pass the welded joint; h) requirements for welding environment (such as temperature, humidity, wind power, etc.); i) storage requirements and shelf lives of the flux and sand mold; j) safety precautions. 3.4.2 Welding records Welding operators shall document the welding process. REFER to Annex A for the records. Records shall be retained for an overhaul period. 3.4.3 Joint marking The welded joints (finished products) of each rail shall be marked. The markings shall be 1m to 3m away from the welds. In addition, the markings shall be clear, upright and identifiable for at least 5 years (or 1 overhaul cycle). The marking method shall ensure that the welded joints (finished products) of each rail are traceable based on the operation records. 3.5 Quality requirements4 Inspection methods4.1 Appearance inspection The methods for inspecting the flatness and surface quality shall meet the requirements of Chapter 7 in TB/T 1632.1-2014. 4.2 Flaw detection The flaw detection methods shall meet the requirements of Chapter 8 in TB/T 1632.1-2014. 4.3 Static bending test The specimen requirements and test methods shall meet the requirements of Chapter 10 in TB/T 1632.1-2014.The connector shall be loaded until it breaks. 4.4 Fatigue test The specimen requirements and test methods shall meet the requirements of Chapter 11 in TB/T 1632.1-2014. 4.5 Tensile test The specimen requirements and test methods shall meet the requirements of Chapter 12 in TB/T 1632.1-2014. 4.6 Hardness test 4.6.1 Weld hardness The weld hardness test shall be carried out in a horizontal position at the weld center on the top of rail (SEE Figure 2). TEST Brinell hardness at 3 points, respectively. CALCULATE the average hardness value, recorded as the weld hardness. TEST the 3 points on the parent metal on both sides of the weld according to the positions shown in the figure, respectively. CALCULATE the average hardness value, recorded as the average hardness of parent metal, HP. The test methods shall meet the requirements of GB/T 231.1-2009. welding production. The production inspection results shall meet the relevant requirements of Chapter 3.Production shall be continued only after passing the inspection. 5.3.5 The production inspection report shall include the following contents. name of the rail welding organization, models and manufacturing plants of the welding materials, names and job training certificate numbers of the main welding operators, manufacturing plant of rails, rail shape, steel grade of rails, delivery status of rails, inspection equipment, reasons for production inspection, detailed inspection results, etc. 5.3.6 Re-inspection shall be carried out when one or more specimens fail to pass the production inspection. First re-inspection. DOUBLE the samples of non-conforming specimens for re- inspection. After passing the inspection, it indicates that the production inspection results are qualified. If one or more of the specimens fail, REPEAT the inspection. Second re-inspection. DOUBLE the samples of non-conforming specimens for re-inspection. After passing the inspection, it indicates that the production inspection results are qualified. If one or more of the specimens fail, the production inspection results shall be determined to be unqualified. 5.4 R... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
