Rig Fab Educational Services
Welder’s Handbook
Weld Defects
Types of Defects
External
Internal
Dimensional
Can be identified by a visual inspection method IE: Dye Penetrant and Magnetic Particle testing.
Require a Non-Destructive testing (NDT) method IE: X- Ray or Ultrasonic testing
Require a Non-Destructive testing (NDT) method IE: X- Ray or Ultrasonic testing
Defect Classes
CRACKS
CAVITIES INCLUSIONS
INCOMPLETE FUSION
INCOMPLETE PENETRATION
GEOMETRIC IMPERFECTIONS
MISC.
Main Causes: Welding operators carelessness or lack of skill. Adverse working conditions (Hot - Cold). Poor Design or lack of preparation.
Main Defects: ▲ Undercut. ▲ Slag inclusions. ▲ Porosity. ▲ Overlap or over-roll.
▲ Lack of fusion. ▲ Incomplete penetration. ▲ Weld cracking. ▲ Joint Misalignment.
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