DEFECT WELD
NON VISUAL
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.
0 komentar:
Post a Comment