13DEUTSCHE NORMFebruary 2003Welding of railway vehicles and partsPart 3: Design rulesDIN6700 3ICS25.160.01;45.060.01Welding of railway vehicles and parts Part 3: Design rulesSoudage des vhicules ferroviaires et des pices Partie 3: Rgles de constructioncontents page Introduction 11Area of application 12Normative instructions 13Terms 24General design rules 25Welded seam- or procedure-related design rules 4Appendix A (normative)A.1 welded seam preparation and seam thickness for fusion welding joints 8Appendix B (normative) B.1 resistance spot welding 15IntroductionWelding is an essential process for the manufacture of railway vehicles and vehicle parts. In this standard series the required instructions for the special process welding“ are being met. Basis of these rules are the welding technological basic standards in consideration of the special requirements of railway vehicle manufacture.Part 1deals with basic terms and basic rules.Part 2contains the requirements for the qualification of welding plants.Part 4deals with the rules for carrying out the work.Part 5contains the quality requirements for welding joints.Part 6contains the specifications for materials, welding fillers, welding procedures and the welding technological documents. 1 Area of applicationThis standard deals with the construction references of metallic materials for the manufacture and maintenance of rail vehicles and their components except for pressure tanks.2 Normative instructionsThis standard contains dated and undated specifications from other publications. These normative references are cited in various places in the text and the publication are quoted. With fixed references later modifications belong only to this standard if they have been added by way of alteration. With undated references the latest published edition is valid. DIN 6700-1 Welding of railway vehicles and parts part 1: basic terms, basic rulesDIN 6700-2 Welding of railway vehicles and parts part 2: classes of parts, recognition of welding plants, conformity evaluationDIN 6700-4 Welding of railway vehicles and parts partl 4: rules of executionDIN 6700-5 Welding of railway vehicles and parts part 5: quality requirementsDIN 6700-6 Welding of railway vehicles and parts part 6: materials, filler metals, welding processes, welding technological documentsDIN EN 1011-1 Welding- recommendations for welding of metallic materials Part 1: General guidance for arc welding; German version EN 1011-1:1998DIN EN 22553 Welding and soldering seams- symbol representation in drawings (ISO 2553:1992), German version of EN 22553:1994DIN EN ISO 13920 Welding General tolerances for welding construction length and angle measurements, form, position (ISO 13920: 1996); German version EN ISO 13920: 1996Normenausschu Schienenfahrzeuge (FSF) im DIN Deutsches Institut fr Normung e. V.Normenausschu Schweitechnik (NAS) im DIN Deutsches Institut fr Normung e.V.3 TermsFor the application of this standard the terms stated in DIN 6700-1 are valid.4 General design rulesIn the arrangements of welding joints the following general design rules have to be observed:4.1 The choice of weld seam quality classes (SGK) follows the basic principle, that the welding joints have to be arranged as far as quality and dimensioning is concerned that they can stand up to the loading under operating conditions. For that the weld seam quality classes have to be chosen depending on the safety requirements and load capacity to table 1.The possibility of the execution of the weld seam quality class and the weldability of the part (welding suitability of material, the welding safety of the construction, welding possibility in production) are to be taken into account. The weld seam quality classes fall into three groups depending on the permissible irregularities (see section 4 in DIN 6700-5):- welding seams with special requirements SGK 1- welding seams with high to medium requirements SGK 2.1, 2.2, 2.3 - welding seams with medium to low requirements SGK 3The SGK 2.1 to 2.3 differentiate only in test extent, see section 6