BS EN ISO 2553-2013 pdf download.Welding and allied processes 一Symbolic representation on drawings – Welded joints. 4 Welding symbol 4.1 General A reference line and arrow line are required elements. Additional elements may be included to convey specific information. It is preferable that the welding symbol is shown on the same side of the joint that the weld is to be made, i.e. the arrow side (see 4.6]. The thickness of the arrow lines, reference line, elementary symbols and lettering shall be in accordance with ISO 128 and ISO 3098-2. In order not to overburden drawings, reference should be made to notes in the drawing or other design- related documents. 4.2 Basic welding symbol If joint details are not specified and the only requirement is to indicate that a joint is to be welded, the basic symbol shown in Figure 1 may be used. In this case, a dual reference line is not required for system A (see 4.6.1A) as no details concerning the weld are being conveyed. The basic welding symbol shall comprise an arrow line, reference line and a tail. 4.3 Welding symbol systems This International standard recognizes two different systems, A and B, to designate the arrow side and other side on drawings. The symbolic representation in system A is based on a dual reference line consisting of a continuous line and a dashed line (see 41). The symbolic representation in system B is based on a single reference line (see 41). Clauses, Tables and Figures which carry the suffix A” or are applicable only to system A or system B respectively. Clauses, tables and figures which do not have a suffix are applicable to both systems. System A and B shall not be mixed and drawings shall clearly indicate which system is used including units of measurement in accordance with ISO 129-1. Examples of comprehensive welding symbols showing the location of elements are given in Figure Ad. 4.4 Elementary symbols 4.4.1 General Elementary symbols, in accordance with Table 1, can be added to the reference line in both systems A and B to indicate the type of weld to be made. Elementary symbols form part of the welding symbol and shall be drawn attached to the reference line generally at the mid-point. Elementary symbols may he complemented by: — supplementary symbols (see 4,5 and Table 3) — dimensions (see ClauseS) — complementary information. The orientation of...
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