1、PorosityRoot cause:a) Shielding under or over flowb) Wind on open areac) Used fan during weldingPorosityPorosityUndercutRoot cause:a) Voltage too highb) Torch angle incorrectPoor workmanshipRoot cause:a) Missing grindingInconsistent weld sizeRoot cause:a) Lack of skillb) CarelessRoot cause:a) Hand s
2、hape on corner incorrect b) Torch moving too fast on cornerUnder fill(corner area)Crack on weld terminate areaRoot cause:a) Weld terminate on center of the weld beadMIG end on front of the weld and near to the thicker wall should eliminate crack issue CrackIncomplete FusionRoot passGroove FaceIncomp
3、lete FusionIncomplete Fusion Between Weld BeadsIncomplete Fusion Between the Weld BeadIncomplete Joint PenetrationIncomplete Joint Penetration(root pass)OverlapSlag InclusionsSpatterSurface Oxidation(melt thru and back without shielding gas) in a Stainless Steel Gas Tungsten Arc Weldlack of fusionCold WeldConvex Fillet WeldConcave Fillet Weld
