ROOT CRACKS

DEFECT WELD

NON VISUAL

ROOT CRACKS

 ROOT CRACKS

Because :

1. NOTCH.
2. STRESS.
3. C equivalent < 0.41 %
4. STRESS RELIEF .
5. MARTENSIT DI H.A.Z.
6. CRYSTAL GROWTH.
7. FERRITE < 5% and > 12 % STAINLESS STEEL .
8. REHEAT CRACK .
9. STRESS CORROSION CRACKING ( S.C.C ) ,Cl2 , S, H2 , CAUSTIC.
10. SHRINKAGE.

Result

1. FATAL

Countermeasures :

1. Do it FAILURE ANALYSIS To determine the cause of crack accurately.
2. If crack are in the welds, GAOUGING . setting again and repair weld as WPS REPAIR.
3. If crack are out the welds , so all material(base metal) replace to a new.

Rejected Criteria

1. Cracked a star considered not dangerous unless if to exceed 5/32 “ length.
2. A kind of crack other all rejected.

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