ROOT CONCAVITY

DEFECT WELD

NON VISUAL

ROOT CONCAVITY

ROOT CONCAVITY

Because :
1. Gap too wide
2. SPEED ROOT too high .
3. AMPERE ROOT high
4. ELEKTRODA too big.
5. For STAINLESS STEEL ROOT GTAW In override in topped with GTAW So that root melted again and sucked up by the process of caping.


Result
1. Started erosion abrasion.
2. S.C.C ( CL2 , NaOH ).
3. weaken weld join .


Countermeasures :
1. GOUGING until the root , setting again and repair welding as WPS Repair.



Rejected Criteria
API 1104 :
1) IF INDIVIDUAL > ¼ INCI,
2) SEPANJANG TEBAL PIPA ,
3) all length welding 12” > ½ “ .



ANSI B 31.3 : The depth of root concavity acceptable when the number of connection plus welding reinforcement > thick nominal ( T W ) b). in 12” length weld > 3inch

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