ROOT UNDERFILL

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.

READMORE

ROOT UNDERCUT

DEFECT WELD

NON VISUAL

ROOT UNDERCUT

 ROOT UNDERCUT

Because :
1. Temp metal too high.
2. Ampere root too high.
3. SPEED ROOT too low.


Result :
1. Weaken connection dilokasi defect.
2. Started erosion abrasion.
3. Voltage sliding inflict a potentially crack


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.

READMORE

BLOW HOLE

DEFECT WELD

NON VISUAL

BLOW HOLE

Blow Hole

Because :
1. ELEKTRODA UP DOWN
2. GAP NO CONSISTENT
3. AMPERE ROOT SWING

Result :
Started erosion abrasion.

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

Rejected Criteria
API 1104 : For the use of normal or SEVERE CYCLIC must repair, if not , it’s reject. In the d is still could be accepted as long as :
1. INDIVIDUAL ≤ 1/4 “ or thick plate .
2. If the number of long in 12” lasan < ½ “.

READMORE