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1、9.WeldingDefects9.WeldingDefects108Figures9.1to9.4givearoughsurveyabouttheclassificationofweldingdefectstoDIN8524.Thisstandarddoesnotclassifyexistingweldingdefectsaccordingtotheiroriginbutonlytotheirappearance.intheunaffectedbasemetalundercut,unfusedlongitudinallongitudinalcrackinweldmetalc
2、ontinuousseamedgeundercutintheHAZinfusionzoneintheunaffectedbasemetaltransversecrackinweldmetalendcraterwithreductionopenofweldcrosssectionintheHAZendcraterintheunaffectedstarshapedbasemetalinweldmetalcracknominalintheHAZweldreinforcementglobulargasinclusionporenominaltoosmallthroatthicknes
3、sporositymany,mainlyevenlydistributedsurfacedefectsatastartpointporesstartdefectsnestofporeslocallyrepeatedporesweldistoowideexcessiveseamwidthlineofporesporesarrangedinalinethrough-goingholeburnthroughinorattheedgeoftheseamwormholeelongatedgasinclusioninwelddirectionbr-er09-01.cdr?ISF2002b
4、r-er09-02.cdr?ISF2002DefectClass:DefectClass:ShapeDefectsCracksandCavitiesFigure9.1Figure9.2lackoffusionbetweenpasseslackoffusionbetweenweldpassesorweldbeadsrootlackoffusionlackoffusionintheareaofweldrootflanklackoffusionlackoffusionbetweenweldandbasemetalinsufficientthroughweldinsufficient
5、lyweldedcrosssectioninsufficientlyweldedrootoneortwolongitudinaledgesofthegrooveareunfusedbr-er-09-03.cdr?ISF2002DefectClass:LackofFusion,InsufficientThrough-WeldFigure9.39.WeldingDefects109AdistinctionofarisingdefectsbytheiroriginisshowninFigure9.5.Thedevelopmentofthemostimportantweldingde
6、fectsisexplainedinthefollowingparagraphs.Lackoffusionisdefinedstringertypeinclusionsasunfusedareabetweenslaglinedifferentshapesanddirectionsweldmetalandbasemate-rialorpreviouslyweldedsinglelayer.Thishappenswhenslaginclusionsirregularslaginclusionsthebasemetalorthepre-viouslayerarenotcom-por
7、enestpletelyorinsufficientlylocallyenrichedmolten.Figure9.6explainsbr-er-09-04.cdr?ISF2002theinfluenceofweldingDefectClass:SolidInclusionsparametersonthedevel-opmentoflackoffusion.InFigure9.4theupperpart,arccharac-teristiclinesofMAGweld-weldingjointdefec
