ROOT POROSITY

DEFECT WELD

NON VISUAL

ROOT POROSITY

Root Porosity

Because :
1. The condition of the root damp or moist.
2. Electrode moist
3. Purging gas contaminated ( GTAW )
4. No purging gas ( GTAW )

Result :
1. Weaken Connection weld.
2. Started erosion abrasion.
3. Started INTERNAL CORROSION.

Countermeasures :
1. Gouging until roots in the location of a defect in the welds and appropriate contents WPS REPAIR.

Rejected Criteria
1. INDIVIDUAL more than 1/8 “ or 25 % minimum thick .
2. The distribution of goods more than the stipulated API 1104 picture 15 and 16.
3. For Cluster Porosity diameter more than 1/2 “ , total length porosity 12 “ Welding more than 1/2 “

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