BS EN ISO 2553 pdf free download

BS EN ISO 2553-2019 pdf free download.Welding and allied processes – Symbolic representation on drawings – Welded joints.
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 6 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 &).
5.3 Length dimensions
5.3.1 General
Nominal weld length dimensions shall be placed to the right ofthe elementary symbol.
In the absence of a length dimension, the weld shall be continuous along the entire length of the joint except when using the weld from point to point symbol where the weld extends only between the identified points.
Start and end points of welds that are not continuous along the entire length of the joint shall not be part ofthe welding symbol but indicated clearly as part ofthe drawing.
5.3.2 Intermittent welds
5.3.2.1 General
Dimensions ofintermittent welds shall be placed to the right ofthe elementary symbol (see Thble6):
a) number ofweld elements, n;
b) length ofeach weld element,!;
c) spacing between weld elements, e (in parentheses).
A multiplication symbol shall be placed between the number ofelements, n, and the length ofthe weld elements, 1. If the number of weld elements is not specified, the intermittent weld shall be made along the whole length ofthe joint.
NOTE Other methods, commonly used by Pacific Rim countries, for designating intermittent welds are shown in Annex C.
5.3.2.2 Chain intermittent welds
For chain intermittent welds, all information shall be included for welds on both sides ofthe joint.
5.3.2.3 Staggered intermittent welds
Staggered intermittent welds shall be designated using the “Z” symbol across the reference line (see Table 3, No. 13) and shall include all information for welds made on both sides ofthe joint. In the absence ofany information concerning the offset, the centres ofthe weld elements on one side ofthe joint shall correspond with the centres ofthe gaps on the opposite side ofthe joint. Otherwise, the offset shall be specified in the tail or elsewhere.
5.3.2.4 Extent of welding
Additional weld lengths at the ends of intermittent welds shall be specified using separate welding symbols.
Un-welded lengths at the ends of intermittent welds shall be specified on the drawing.
5.4 Butt welds
5.4.1 Penetration depth
The required penetration depth shall be placed to the left of the elementary symbol (see Table 6. No. 1).
In the absence of any cross-sectional dimension, butt welds shall always be full penetration.
Where joint geometry or joint preparation are not specified, an alternative symbol can be used to represent butt welds on drawings by specifying the required weld quality — see Clause 7.
Where a specified root reinforcement is required, the minimum dimension of the root reinforcement shall be placed to the left of the root reinforcement symbol (see Figure 3).
5.4.2 Double-sided welds
In double-sided butt welds, each weld shall be separately dimensioned.
NOTE Full penetration symmetrical butt welds do not need to be dimensioned.
5.4.3 Flanged butt welds
Flanged butt welds are always full penetration welds (the raised edges are completely melted). These welds require no dimensioning.
5.4.4 Flare bevel and flare-V butt welds
Flare bevel and flare-V butt welds shall always be dimensioned. Examples of how to dimension these types of weld are given in Table 6. No. 1.6 and No. 1.7.
5.5 Fillet welds
5.5.1 Weld size
The letter, a, nominal throat thickness, or z, leg length, shall be placed in front of the dimension to the left of the elementary symbol (see Table 6. No. 2.1).
For fillet welds with unequal leg lengths the dimensions of each leg shall be included, preceded by the letterz, e.g. zi4 Z28 (see Table 6, No.2.3). If the required leg lengths cannot be identified clearly using the welding symbol, additional sketches or indications shall be given on the drawing or in other documents.
For fillet welds made on both sides of a joint, the dimensions of both welds shall be specified even if they are identical (symmetrical).
5.5.2 Deep penetration fillet welds
The letter, s, shall be placed in front of the required deep penetration throat thickness. This shall be placed in front of the nominal throat thickness, a, and its dimension as shown in Table 6. No. 2.2.BS EN ISO 2553 pdf download.