DEFECT WELD
NON VISUAL
ROOT UNDERFILL
ROOT UNDERFILL
Because :
1. Gap dirty..
2. Ampere root low.
3. Temp metal cold.
4. HIGH LOW.
Result :
1. Notch potential crack.
2. Damage cleaning pig.
Countermeasures :
1. Gouging until roots in the location of a defect in the welds and appropriate contents WPS repair.
Rejected Criteria
API 1104 : If the number of a length of more than 2 “ in 12” Long welds or the length of more than ¼ long welds overall, Reject .
Accepted Criteria
ANSI B31.3 : for normal category , SEVERE CYCLIC and category D , LONGITUDINAL GOOVE don’t have UNDERCUT , for branch connection ≤ 1 mm ( 1/32 “ ) and ≤ ¼ thick normal weld.
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