The symbols given in this standard can be used on technical drawings for welded components. Design- related specifications, such as type, thickness, and length of weld, weld quality, surface treatment, filler material and testing specifications, can be indicated directly at the weld by means of the symbols given in this standard. The principals of this standard can be applied to brazed and soldered joints.
Clarity may be improved by references to collective information in the drawings or references to additional design-related documents.
Preparation for production may require detailed welding-related planning. The type of representation described in this standard can be used for this purpose and complemented by additional production- related information (e.g. welding position, welding process, WPS, weld preparation, preheating …). This information is often given in production-related documents, such as work schedules or welding procedure specifications (WPS).
Technical drawings are intended to clearly and understandably illustrate design-related specifications. Welding-related drawings should be prepared and checked by specially trained personnel (see ISO 14731).
This edition of ISO 2553 recognizes that there are two different approaches in the global market to designate the arrow side and other side on drawings, and allows for either to be used in isolation, to suit a particular market need. Application of either approach identifies a welding symbol in accordance with this International Standard. The approach in accordance with system A is based on ISO 2553:1992. The approach in accordance with system B is based upon standards used by Pacific Rim countries.
This International Standard defines the rules to be applied for symbolic representation of welded joints on technical drawings. This may include information about the geometry, manufacture, quality and testing of the welds. The principles of this standard may 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 Interational Standard:
— 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 International Standard may be combined with other symbols used on technical drawings, for example to show surface finish requirements.
An alternative designation method is presented which may 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 International Standard, including dimensions, are illustrative only and are intended to demonstrate the proper application of principles. They are not intended to represent good design practices, or to replace code or specification requirements.
5 Dimensioning of welds
5.1 General
Dimensions shall be specified on the same side of the reference line as the associated elementary symbol (see Table S and Figure A.1).
Drawings shall clearly indicate the units of measurement. Dual units of measure shall be avoided. If it is desired to show conversions from one system of measure to another, a table of conversions should be included on the drawing.
5.2 Cross-sectional dimensions
Cross-sectional dimensions shall be placed to the left of the elementary symbol. Letters shall only be combined with cross-sectional dimensions for fillet welds (see 5k).
5.3 Length dimensions
5.3.1 General
Nominal weld length dimensions shall be placed to the right of the elementary symbol.BS EN ISO 2553:2013 pdf free download.