BS EN ISO 5817:2007 Welding. Fusion-welded joints in steel, nickel, titanium and thei

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BS EN ISO 5817:2007 Welding. Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded). Quality levels for imperfections

Size: 744 KB | Format: PDF | Quality: Original preprint | Year: 31 August 2007 | pages: 36 | ISBN: 978 0 580 56192 4

BS EN ISO 5817 provides quality levels of imperfections in fusion-welded joints (except for beam welding) in all types of steel, nickel, titanium and their alloys. It applies to material thickness above 0,5 mm. It covers fully penetrated butt welds and all fillet welds. The principles of this international standard may also be applied to partial-penetration butt welds.

Quality levels for beam welded joints in steel are presented in BS EN ISO 13919-1 .

Three quality levels are given in order to permit application to a wide range of welded fabrication. They are designated by symbols B, C and D. Quality level B corresponds to the highest requirement on the finished weld. The quality levels refer to production quality and not to the fitness-for-purpose of the product manufactured.

This international standard applies to:

Unalloyed and alloy steels
Nickel and nickel alloys
Titanium and titanium alloys
Manual, mechanized and automatic welding
All welding positions
All types of welds, e.g. butt welds, fillet welds and branch connections.

BS EN ISO 5817 is an international standard that should be used as a reference in the drafting of application codes and/or other application standards. It contains a simplified selection of fusion weld imperfections based on the designations given in BS EN ISO 6520-1.

BS EN ISO 5817 defines the dimensions of typical imperfections which might be expected in normal fabrication. It may be used within a quality system for the production of welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application. The quality level necessary in each case should be defined by the application standard or the responsible designer in conjunction with the manufacturer, user and/or other parties concerned. The quality level shall be prescribed before the start of production, preferably at the enquiry or order stage. For special purposes, additional details may be prescribed.

The quality levels given in BS EN ISO 5817 provide basic reference data and are not specifically related to any particular application. They refer to types of welded joint in fabrication and not to the complete product or component itself. It is possible, therefore, that different quality levels are applied to individual welded joints in the same product or component.

It would normally be expected that for a particular welded joint the dimensional limits for imperfections could all be covered by specifying one quality level. In some cases, it may be necessary to specify different quality levels for different imperfections in the same welded joint.

The choice of quality level for any application should take account of design considerations, subsequent processing (e.g. surfacing), mode of stressing (e.g. static, dynamic), service conditions (e.g. temperature, environment) and consequences of failure. Economic factors are also important and should include not only the cost of welding but also of inspection, test and repair.

Although BS EN ISO 5817 includes types of imperfection relevant to the fusion welding processes listed in Clause 1, only those which are applicable to the process and application in question need to be considered.

Imperfections are quoted in terms of their actual dimensions, and their detection and evaluation may require the use of one or more methods of non-destructive testing. The detection and sizing of imperfections is dependent on the inspection methods and the extent of testing specified in the application standard or contract.

BS EN ISO 5817 is directly applicable to visual testing of welds and does not include details of recommended methods of detection or sizing by non-destructive means. It should be considered that there are difficulties in using these limits to establish appropriate criteria applicable to non-destructive testing methods such as ultrasonic, radiographic, eddy current, penetrate, magnetic particle testing and may need to be supplemented by requirements for inspection, examining and testing.

The values given for imperfections are for welds produced using normal welding practice. Requirements for smaller (more stringent) values may include additional manufacturing processes, e.g. grinding, TIG dressing.

The following welding processes and their defined sub-processes in accordance with BS EN ISO 4063:

Metal-arc welding without gas protection
Submerged-arc welding
Gas-shielded metal-arc welding
Gas-shielded welding with non-consumable electrodes
Plasma arc welding
Oxy-fuel gas welding (for steel only).

Metallurgical aspects, e.g. grain size, hardness, are not covered by BS EN ISO 5817.

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