BS EN ISO 2553:2019 pdf free.Welding and allied processes – Symbolic representation on drawings – Welded joints.
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一General principles of presentation ISO 129-1 Technical product documentation (TPD)一Presentation of dimensions and tolerances 一Part 1:  General principles ISO 3098-2, Technical product documentation – Lettering 一Part 2: Latin alphabet, numerals and marks ISO 4063, Welding and allied processes一Nomenclature of processes and reference numbers    ISO/TR 25901 (all parts), Welding and related processes一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: 一ISO Online browsing platform: available at https://www.iso.org/obp 一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 madeNote 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 4.7.3.11 intermittent weld series of weld elements made at intervals along a joint [SOURCE: ISO/TR 25901-1:2016, 2.1.6.15] Note 1 to entry: See 5.3.2. 3.11.1 chain intermittent weld intermittent weld (3.11) on each side of a joint arranged so that the weld elements lie opposite one another along the joint Note 1 to entry: These are usually fillet welds in Tjoints and lap joints. Note 2 to entry: See 5.3.2.2. [SOURCE: ISO/TR 25901-1:2016, 2.1.6.17, modified一Note 2 to entry has been adapted.]BS EN ISO 2553 pdf download.