BS EN ISO 2553:2019 pdf – Welding and allied processes – Symbolic representation on drawings – Welded joints.
1 Scope This document defines the rules to be applied for symbolic representation of welded joints on technical drawings. This can include information about the geometry, manufacture, quality and testing of the welds. The principles of this document can also be applied to soldered and brazed joints. It is recognized that there are two different approaches in the global market to designate the arrow side and other side on drawings. In this document: — clauses, tables and figures which carry the suffix letter “A” are applicable only to the symbolic representation system based on a dual reference line; — clauses, tables and figures which carry the suffix letter “B” are applicable only to the symbolic representation system based on a single reference line; — clauses, tables and figures which do not have the suffix letter “A” or “B” are applicable to both systems. The symbols shown in this document can be combined with other symbols used on technical drawings, for example to show surface finish requirements. An alternative designation method is presented which can be used to represent welded joints on drawings by specifying essential design information such as weld dimensions, quality level, etc. The joint preparation and welding process(es) are then determined by the production unit in order to meet the specified requirements. NOTE Examples given in this document, including dimensions, are illustrative only and are intended to demonstrate the proper application of principles. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 128 (all parts), Technical drawings — General principles of presentation ISO 129-1, Technical product documentation (TPD) — Presentation of dimensions and tolerances — Part 1: General principles ISO 3098-2, Technical product documentation — Lettering — Part 2: Latin alphabet, numerals and marks ISO 4063, Welding and allied processes — Nomenclature of processes and reference numbers ISO/TR 25901 (all parts), Welding and related processes — Vocabulary 3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO/TR 25901 (all parts) and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/ 3.1 welding symbol symbol consisting of an arrow line (3.3)and a reference line (3.4) and which can also include elementary symbols (3.8) and supplementary symbols (3.9), dimensions and/or tail, used on technical drawings Note 1 to entry: See Clause 4. 3.2 basic welding symbol symbol consisting of an arrow line (3.3), reference line (3.4) and tail used when the joint is not specified and only to indicate that a welded joint is to be made Note 1 to entry: See 4.2. 3.3 arrow line leader line used to indicate that the joint is to be welded generally drawn at 135° to the reference line (3.4) Note 1 to entry: See 4.6. 3.4 reference line part of the welding symbol (3.1) on which the elementary symbol (3.8) is located, generally drawn parallel to the bottom edge of the drawing Note 1 to entry: See 4.7. 3.5 tail V-shaped element added to the end of the continuous reference line (3.4) away from the arrow line (3.3) Note 1 to entry: See 4.8. 3.6 arrow side side of the joint to which the arrow line (3.3) is pointing Note 1 to entry: See 126.96.36.199. 3.7 other side opposite side of the joint to the arrow side (3.6) Note 1 to entry: See 188.8.131.52. 3.8 elementary symbol symbol forming part of the welding symbol (3.1) and drawn on the reference line (3.4) to indicate the type of weld and joint preparation Note 1 to entry: See 4.4. 3.9 supplementary symbol symbol used in conjunction with elementary symbols (3.8) to convey additional information about the joint Note 1 to entry: See 4.5.