INCOMPLETE PENETRATION (IP)

DEFECT WELD

NON VISUAL

INCOMPLETE PENETRATION

INCOMPLETE PENETRATION

Because :
1. GAP too narrow
2. Ampere root low
3. Welding machine not Calibration
4. The electrodes up and down
5. GAP dirty

Result :
1. Notch potential crack.
2. weaken weld joint.
3. 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 : 1. INDIVIDUAL > 1 “ , 2. Total length 12 “ welding > 1 “ , total length of weld 12 “ length weld > 8% length weld.
• If IP potential HIGH LOW : 1If side of the root of open > 2” ( INDIVIDUAL ) , 2. In 12” length weld , total length > 3” .

Accepted Criteria

• ANSI B 31.3 : 1. INDIVIDUAL ≤ 1 mm ( 1/32 “ ) and ≤ 0.2 X weld thicknes normal . 2. Total length of weld 6 “ ≤ 38 mm ( 1 ½ “ )

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