BS EN 01708-1:2010 pdf download
BS EN 01708-1:2010 pdf download.Welding — Basic welded joint details in steel Part 1: Pressurized components.
The purpose of BS EN 01708-1 is to exemplify commonly accepted welded connections in pressure system5 It does not promote the standardization of connections that may be regarded as mandatory or restrict development in any way. Stress analysis rules should be considered if necessary.
This standard contains examples of connections welded by:
— Manual metal-arc welding with covered electrode (111);
— Submerged arc welding (12):
Gas shielded metal arc welding (13);
— Tungsten inert gas arc welding; TIG-welding (14);
— Plasma arc welding (15)
processes (process numbers according to EN ISO 4063) in steel pressure systems. Other processes by agreement.
The standard covers welded pint details in steel, but can be applied to other metallic materials, In such cases the shape and dimensions of the weld should be checked.
The estimation of the suitability of welded connections for special service conditions, for example corrosion and fatigue are not specialty considered.
2 Normative references
The following referenced documents are indispensable for the application of this dociiment. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 4063. Welding and allied pocesses — Nomenclature of processes and reference numbers
(ISO 4063:2009)
EN ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006)
EN ISO 9692-1:2003. Welding and allied processes — Recommendations for joint preparation — Part 1: Manual metal-arc welding, gas-shielded metal-arc welding, gas welding. TIG wekhog and beam welding of steels (ISO 9692-1:2003)
EN ISO 9692-2:1996, Welding and allied processes — Joint preparation — Part 2: Submerged arc welding of steels (ISO 9692-2:1998)
3 RequIrements
3.1 Selection of detail
Connections are not considered to be equally suitable for all service conditions, nor is the order in which they are shown indicative of their relative characteristics. In selecting the appropriate detail to use from the several alternatives shown for each type of connection, consideration shall be given to existing fabilcation and service conditions that pertain.
3.2 Joint preparation (geometry and size)
32.1 General
The limitations quoted in weld profiles and sizes are based on conimonly accepted practice, but they may be subjected to modifications if required by special welding techniques or design conditions, wtuch should be included in the design documents and in the welding procedure specifications (WPS).
3.2.2 Joint preparation geometry
Examples of recommended joint preparation 9e04’netry (e.g. bevel angles, root radius, presence of backing strips, root faces) are referred to EN ISO 9692-1 when applicable and to EN ISO 9692-2 relative to submerged arc welding process. Missing dimensions 01 preparations are in accordance with EN ISO 9692.1.
In case where full penetration butt joints are indicated, it is intended that they shall be back chipped or gouged and back welded, or allematively that the welding procedure shall be such as to ensure sound, effective root penetration.
For relevant difference of thickness (generally a difference of about 3mm (see Table 1, no. 1.1.1 to 1.1.6) could be considered relevant in any case the thickness of material shall be taken into account, as well as the shape of the joint) of parts to be butt welded, the thickest element shall be shaped with a slope of 1:5 up to 1:2. Smoother transition of wall thickness Is applicable In severe service conditions.
3.2.3 Weld sizes
The thickness of welds (in particular of fillet welds), which are not determined by their profile, are based on the assumption that the connection need not be stronger than the connected parts.
3.6Welds for smooth transition
ln some cases it is convenient to foresee a fillet weld providing smooth geometric transition from the surfaceof one welded part to the surface of the other one, e.g. from branch to shell. ts purpose is to soften the notcheffect in the branch-shell edge and therefore the throat thickness is not presented on the figure concerned.
3.7Oblique and tangential branches
The welded connections are contained in Tables 1 to 13.Regarding branches, the oblique and tangentialones are not specially considered as their preparation is similar to that reported on Tables 2 and 3 for radialbranches.Only some significant cases are therefore considered (see Table 2, no.2.2).
NOTE 1 The welds are only blackened in the following tables when the figures do not give information about thedimension of the values for the preparation.
NOTE 2 lt is not intended that the values of the dimension given in the tables should be measured precisely but ratherthe general philosophy shoulld be applied.
