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1、RulefinderVersion9.14(July2010)-Lloyd’sRegisterRulesandRegulations-RulesfortheManufacture,TestingandCertificationofMaterials,July2010-RequirementsforWeldedConstruction-SpecificrequirementsforshiphullstructureandmachinerySection2Specificrequirementsforshiphullstructureandmachi
2、nery2.12Non-destructiveexaminationofwelds2.12.1.Allfinishedweldsaretobesoundandfreefromcracksandsubstantiallyfreefromlackoffusion,incompletepenetration,porosityandslag.Thesurfacesofweldsaretobereasonablysmoothandsubstantiallyfreefromundercutandoverlap.Careistobetakentoensuret
3、hatthespecifieddimensionsofweldshavebeenachievedandthatbothexcessivereinforcementandunder-fillofweldsisavoided.2.12.2.Weldsformingpartofthehullandsuperstructuremaybecoatedwithathinlayerofprotectiveprimerpriortoinspectionprovideditdoesnotinterferewithinspectionandisremoved,ifr
4、equiredbytheSurveyor,forcloserinterpretationofpossibledefectiveareas.2.12.3.Allweldsaretobevisuallyinspectedbypersonneldesignatedbythebuilder.Visualinspectionofallweldsmaybesupplementedbyothernon-destructiveexaminationtechniquesincasesofunclearinterpretation,asconsideredneces
5、sary.TheacceptancecriteriaforvisualtestingaregiveninTable13.2.4.Table13.2.4Acceptancecriteriaforvisualtesting,magneticparticleandliquidpenetranttestingSurfacediscontinuityClassificationaccordingtoISO6520-1AcceptancecriteriaforvisualtestingCrack100NotacceptedLackoffusion401Not
6、acceptedIncompleterootpenetrationinbuttjointsweldedfromoneside4021NotacceptedSurfacepore2017Singleporediameterd≤0,25t,forbuttwelds,seeNote1d≤0,25a,forfilletwelds,withmaximumdiameter3mm,seeNote12,5dasminimumdistancetoadjacentporeUndercutinbuttwelds501Depth≤0,5mm,whateverthelen
7、gthDepth≤0,8mm,withamaximumcontinuouslengthof90mm,seeNote2Undercutinfilletwelds501Depth≤0,8mm,whateverthelengthNOTES1.tistheplatethicknessofthethinnestplate,andaisthethroatofthefilletweld.2.Adjacentundercutsseparatedbyadistanceshorterthantheshortestundercutaretoberegardedasas
8、inglecontinuousundercut.2.12.4.Inadditiontovisualinspection,weldedjo
