BS EN ISO 10042:2018 pdf download – Welding — Arc-welded joints in aluminium and its alloys — Quality levels for imperfections
This document specifies quality levels for imperfections in arc-welded joints in aluminium and its alloys. It applies to material thicknesses above 0,5 mm.
Three quality levels are given in order to permit application to a wide range of welded constructions.
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 (see 3.2) of the product manufactured.
This document is applicable to all types of welds (e.g. butt welds, fillet welds and branch connections),to manual, mechanized and automated welding, and to all welding positions.
It is applicable to the following welding processes:
— metal inert gas welding (MIG welding); gas metal arc welding /USA;
— tungsten inert gas welding (TIG welding); gas tungsten arc welding /USA;
— plasma arc welding.
It is not applicable to metallurgical aspects (e.g. grain size, hardness).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6520-1, Welding and allied processes — Classification of geometric imperfections in metallicmaterials — Part 1: Fusion welding
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
quality level
description of the quality of a weld on the basis of type, size and amount of selected imperfections
fitness for purpose
ability of a product, process or service to serve a defined purpose under specific conditions
short imperfection
<welds of length ≥100 mm> imperfection whose total length is not greater than 25 mm in any 100 mmof their length
short imperfection
<welds less than 100 mm long> imperfection whose total length is not greater than 25 % of thelength of the weld
systematic imperfection
imperfection that is repeatedly distributed in the weld over the weld length to be examined, the size ofeach individual imperfection being within the specified limits
cross-sectional area
area to be considered after fracture or sectioning
projected area
area where imperfections distributed along the volume of the weld under consideration are imaged
Note 1 to entry: In contrast to the cross-sectional area (3.6), the occurrence of imperfections is dependent on the weld thickness when exposed radiographically (see Figure 1).
4 Symbols
The following symbols are used in Table 1.
A area of clustered porosity
a nominal throat thickness of a fillet weld (see also ISO 2553)
b width of the weld
d diameter of a gas pore
d A diameter of area surrounding a area of clustered porosity
d Ac diameter of circle surrounding total gas pore area
h height or width of an imperfection
l length of imperfection in longitudinal direction of weld
l p length of projected or cross-sectional area
s nominal butt weld thickness (see also ISO 2553)
t wall or plate thickness (nominal size)
w p width or height of cross-sectional area
z leg length of a fillet weld (see also ISO 2553)
5 Assessment of imperfections
Limits on imperfections are given in Table 1.
Systematic imperfections are only permitted in quality level D, provided other requirements of Table 1are fulfilled.
A welded joint should usually be assessed for each individual type of imperfection separately (see Table 1, 1.1 to 3.2).
Different types of imperfection occurring at any cross-section of the joint need special consideration (see multiple imperfections in Table 1, 4.1).
The limits on multiple imperfections (see Table 1) are only applicable in cases where the requirements for a single imperfection are not exceeded.
Any two adjacent imperfections separated by a distance smaller than the major dimension of the smaller imperfection shall be considered as a single imperfection.BS EN ISO 10042 pdf download.