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Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) - Quality levels for imperfections

Executive summary

Requirements for quality levels for imperfections in fusion-welded joints.


This International Standard 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.

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

The purpose of this International Standard is to define dimensions of typical imperfections which might be expected in normal fabrication. It may be used within a quality system for the production of factory-welded joints. It provides three sets of dimensional values from which a selection can be made for a particular application.

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;

This International Standard is directly applicable to visual testing of welds and does not include details of recommended methods of detection or sizing by non destructive means.

The standard does not cover metallurgical aspects, e.g. grain size, hardness.

History and related standards

This International Standard supersedes BS EN 25817:1992 which is withdrawn.

This standard includes the following cross references:

ISO 2553:1992, ISO 4063:1998, ISO 6520-1:1998.

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