DEFECT WELD
(VISUAL)
HIGH LOW
High Low
1. Any setting
2. Different thick
Result :
1. Started erosion abrasion.
2. Producing a voltage sliding potential to crack
Countermeasures :
1. The prominent part in an oblique 1 : 3 ( ASME VIII ) 1 ; 2.5 ( ANSI B31.3 )
Rejected Criteria
1 ANSI B31.3 : t ≤ ¼ “ max. 1.5 mm ( 1/16 “ ) EXTERNAL t > ¼ ~ ≤ 13 mm ( ½ “ ) , max. 3 mm ( 1/8” )t > 13 mm ( ½ “ ) ~ ≤ 25 mm ( 1” ) ,max 4 mm ( 5/32 “ ) t > 25 mm ( 1 “ ) , max 5 mm ( 3/16 “ )
INTERNAL = 2 X EXTERNAL exceeds the maximum mentioned above, if no do it, rejected
2. API 1104 :
a). If any side of weld opened >2inch individual.
b). in 12” length weld > 3inch
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