ISO 5817

( Crack) : 1- 2- 3- 4-

ImperfectionT (mm)DCB

Crack>0.5N.PN.PN.P

) (Surface pore :1- 2- 3-

a , s (nominal butt weld thickness)

End crater pore) (

:1- 2- 3- a , s (nominal butt weld thickness)

ImperfectionT (mm)DCB

End crater pore0.5to3b3Max2(h

( Lack of fusion or incomplete fusion) :1- 2- 3- 4- 5- .

ImperfectionT (mm)DCB

Lack of fusion( incomplete fusion or micro L.O.F)>0.5N.PN.PN.P

( Incomplete root penetration) :1- 2- 3- 4- t (wall or plate thickness)

Incomplete root penetration>0.5h

( Undercut) :1- 2- 3- 4-

t (wall or plat thickness)

Continuous/Intermittent undercut0.5to3h

(Shrinkage groove) :1- 2- Shrinkage groovet (wall or plat thickness)

Shrinkage groove0.5to3h

(Excess weld metal) :1- b (width of weld reinforcement)

Excess weld metal (b.w)>0.5H

( Excess Penetration) :1- ( ) 2- 3- 3- b (width of weld reinforcement)

Excess penetration0.5to3h

(Incorrect weld toe ) :1- 2-

Incorrect weld toe>0.5(B.W) >90 >110 >150>0.5(F.W)>90 >110 >110

ImperfectionT (mm)DCB

(Over Lap) :1- Over Lapb (width of weld reinforcement)

Overlap>0.5h

(Burn through ) : 1- 2- Burn through

Burn through>0.5N.PN.PN.P

ImperfectionT (mm)DCB

(Excessive asymmetry F.W) :1- a (nominal butt weld thickness)

Excessive asymmetry of fillet weld>0.5h

(Root concavity) :1- 2- 3- t (wall or plate thickness)

Root concavity0.5to3h

Root porosity)) :1- 2- 3- 4- Root porosity

Root porosity>0.5Locally permittedN.PN.P

ImperfectionT (mm)DCB

Poor restart) ) :1- 2- 3- 4-

Poor restart>0.5PermittedN.PN.P

ImperfectionT (mm)DCB

Insufficient throat thickness)) : 1- 2- a (nominal butt weld thickness)

Insufficient throat thickness0.5to3h

(Stray arc) :

Stray arc>0.5PermittedN.PN.P

ImperfectionT (mm)DCB

(Spatter) :1- 2-

Spatter>0.5Acceptance depends on application , o.g material, corrosion protection

ImperfectionT (mm)DCB

(Angular misalignment) : .

Angular misalignment>0.54mm2mm1mm

ImperfectionT (mm)DCB

Incorrect root gap(F.W) ) : .a (nominal butt weld thickness)

ImperfectionT (mm)DCB

Incorrect root gap for fillet welds0.5to3h

(Linear misalignment) : . Linear misalignmentt (wall or plat thickness)

ImperfectionT (mm)DCB

Linear misalignment0.5to3h

( ( Excessive throat thickness :1- 2- a (nominal butt weld thickness)

ImperfectionT (mm)DCB

Excessive throat thicness>0.5Unlimitedh

Cluster porosity)) : 1- 2- 3- 4- Clustered porosity

ImperfectionT (mm)DCB

Clustered (Iocalized) porosity>0.5Max4mmMax3mmMax2mm

Worm holes)) : .Worm holess (nominal butt weld thickness or in the case of partial penetration)

Elongated cavity wormholes>0.5(B.W)h

(Solid -Slag-Flux-Oxide inclusions) :1- 2- inclusionss (nominal butt weld thickness or in the case of partial penetration)

(Solid-Slag-Flux-Oxide) inclusions>0.5(B.W)h

IRANIAN WELDING RESEARCH & ENGINERING CENTER ( TOHID NEJADRAHIM ) Remark: a , s (nominal butt weld thickness)b (width of weld reinforcement)d (diameter of pore)h (size or height of imperfection)l (length of imperfection)s (nominal butt weld thickness or in the case of partial penetration)t (wall or plat thickness)z (leg length of fillet welds)