QC Training - Defects

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1、WeldDefectClassificationDefectscanbegroupedunderthreemainclassificationsPlanarDefects:linearfromatleastonedimension•Cracks•LackoffusionLinearVolumetricDefects:Linearinlengthwithvolume•Slaglines•lackoffusionwithassociatedslag•Piping.Non-planardefects:roundedindication

2、swithoutsignificantlength•Slaginclusions•Gaspores/blowholes.•Othermetallicandnon-metallicinclusionsForJUTALInternalPurposesOnlyFaultsinFusionWeldsDefectswhichmaybedetectedbyvisualinspectioncanbegroupedunderthefollowingheadingsCracksLackoffusionSolidinclusionsMech

3、anicaldamageSurfaceandprofilesParentmaterialdamageMisalignment(set-upMiscellaneousirregularities)GasporesandporosityForJUTALInternalPurposesOnlyCracksForJUTALInternalPurposesOnlyCracksWeldMetalHydrogenCrackingHAZHydrogenCrackingSolidificationCrackingLamellarTear

4、ingForJUTALInternalPurposesOnlyCracksCracksthatmayoccurinweldedmaterialsarecausedgenerallybymanyfactorsandmaybeclassifiedbyshapeandposition,cracksareclassedasplanar.ClassifiedbyShapeClassifiedbyPositionLongitudinalHAZTransverseCentrelineCraterBranchedFusionzon

5、eChevronParentmetalForJUTALInternalPurposesOnlyTransversecrackLongitudinalcrackForJUTALInternalPurposesOnlyInclusionsForJUTALInternalPurposesOnlyGasCavitiesGaspore<1.5mmBlowhole.>1.6mmGasporeClusterporosityLossofgasshieldDampelectrodesContaminationBlowholeArcle

6、ngthtoolargeHerringboneporosityDamagedelectrodefluxMoistureonparentmaterialWeldingcurrenttoolowRootpiping/wormholesForJUTALInternalPurposesOnlyGasCavitiesPorosityRootpipingForJUTALInternalPurposesOnlyClusterporosityHerringboneporosityForJUTALInternalPurposesOnlySo

7、lidInclusionsSlaginclusionsaredefinedasanon-metallicinclusioncausedbysomeweldingprocessSlagoriginatesfromweldingfluxMAGandTIGweldingprocessproducesilicainclusionsSlagiscausedbyinadequateSlaginclusionsLackofsidewallfusionwithcleaningassociatedslagOtherinclusionsin

8、cludetungstenandcopperinclusionsfromtheTIGandMAGweldingprocessLackofinterunParallelslaglinesfusion+slagForJUTALInternalPurposesOnly