Why Weld Defects Matter
Weld defects reduce strength and can initiate cracks and failures. Inspection to AS/NZS 1554 catches them before load is applied.
The Top 10
The defects we most commonly detect:
- Cracks
- Lack of fusion
- Incomplete penetration
- Porosity
- Slag inclusions
- Undercut
- Overlap
- Excessive reinforcement
- Burn-through
- Distortion
Method Selection Matters
Visual inspection is a starting point, not a complete answer for every weld. UT may suit internal reflectors in an appropriate geometry; MPI suits surface and near-surface cracking in ferromagnetic steel; PT suits surface-breaking indications on clean, non-porous materials. Acceptance depends on the applicable weld specification and inspection scope.
Limits of a Weld Result
No single NDT method detects every discontinuity under every condition. Record the welds examined, extent, surface condition, method limitations and any areas not accessible. A reported indication may require confirmation, repair assessment or engineering review before a disposition is made.
Where alterations leave existing members in place, plan inspection of retained steel during partial demolition around the engineered sequence and connection access.