ISO 5817:2014 pdf download.Welding — Fusion-welded joints insteel, nickel, titanium and their alloys(beam welding excluded)-Quality levels for imperfections.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
quality level
description of the quality of a weld on the basis of type, size and amount of selected imperfections
3.2
fitness-for-purpose
ability of a product, process or service to serve a defined purpose under specific conditions
3.3
short imperfections
<weld 100mm long or longer> imperfections whose total length is notgreaterthan 25mm in the 100mm of the weld which contains the greatest number of imperfections
3.4
short imperfections
<weld less than 100 mm long> imperfections whose total length is not greater than 25 % of the length of the weld
systematic imperlections
Imperfections that are repeatedly distributed in the weld over the weld length to be examined, the size ofa single iniperfection being within the specified limits
3.6
projected area
area where imperfections distributed along the volume of the weld under consideration are imaged two-dimensionally
Note I to entry: In contrast to the cross-sectional area, the occurrence of imperfections is dependent on the weld thickness when exposed radiographically (see Figure 1).
3.7
cross-sectional area
area to be considered after fracture or sectioning
3.8
smooth weld transition
even surface with no irregularities or sharpness at the transition between the weld bead and the parent material
3.9
fatigue class FATx
classification reference to S-N curve, In which xis the stress range in MPa at 2• 106 cycles
Note 1 to entry: Fatigue properties are described by S-N-Curves (Stress-Number of cycle- curves).
Note 2 to entry: See Annex C.
For the purposes of this document, the following terms and definitions apply.
3.1
quality level
description of the quality of a weld on the basis of type, size and amount of selected imperfections
3.2
fitness-for-purpose
ability of a product, process or service to serve a defined purpose under specific conditions
3.3
short imperfections
<weld 100mm long or longer> imperfections whose total length is notgreaterthan 25mm in the 100mm of the weld which contains the greatest number of imperfections
3.4
short imperfections
<weld less than 100 mm long> imperfections whose total length is not greater than 25 % of the length of the weld
systematic imperlections
Imperfections that are repeatedly distributed in the weld over the weld length to be examined, the size ofa single iniperfection being within the specified limits
3.6
projected area
area where imperfections distributed along the volume of the weld under consideration are imaged two-dimensionally
Note I to entry: In contrast to the cross-sectional area, the occurrence of imperfections is dependent on the weld thickness when exposed radiographically (see Figure 1).
3.7
cross-sectional area
area to be considered after fracture or sectioning
3.8
smooth weld transition
even surface with no irregularities or sharpness at the transition between the weld bead and the parent material
3.9
fatigue class FATx
classification reference to S-N curve, In which xis the stress range in MPa at 2• 106 cycles
Note 1 to entry: Fatigue properties are described by S-N-Curves (Stress-Number of cycle- curves).
Note 2 to entry: See Annex C.
