Defects of welding

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Any discontinuity (or irregularity) in the weld metal, which exceeds the applicable code limit, is termed as a WELD DEFECT (or Welding Defect). Please note that a discontinuity can be called as a defect only when if it exceeds the specified code limit, hence we can say that every defect present in the weld metal is a discontinuity but every discontinuity present in the weld metal may not necessarily be a defect. A defect can be macroscopic or microscopic. 

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TABLES OF CONTENTS:

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1. Introduction
2. Classification of defects
3. Cracks
4. Porosity and blow holes
5. Undercut
6. Under fill
7. Lack of penetration
8. Lack of fusion
9. Over lap

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