Summary:
This document specifies 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 ? 0,5 mm. It covers fully penetrated butt welds and all
fillet welds. Its principles can also be applied to
partial-penetration butt welds. Quality levels for beam-welded
joints in steel are presented in 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. Several types of loads are considered, e.g. static load,
thermal load, corrosion load, pressure load. Additional guidance on
fatigue loads is given in Annex B. The quality levels refer to
production and good workmanship. This document is applicable to:
a) non-alloy and alloy steels; b) nickel and nickel
alloys; c) titanium and titanium alloys; d) manual,
mechanized and automatic welding; e) all welding positions;
f) all types of welds, e.g. butt welds, fillet welds and
branch connections; g) the following welding processes and
their sub-processes, as defined in ISO 4063: — 11 metal arc
welding without gas protection; — 12 submerged arc welding; —
13 gas-shielded metal arc welding; — 14 gas-shielded arc
welding with non-consumable tungsten electrode; — 15 plasma arc
welding; — 31 oxyfuel gas welding (for steel only).
Metallurgical aspects, such as grain size and hardness, are not
covered by this document.