POROSITY

DEFECT WELD 

(VISUAL)

POROSITY

Defect Weld : Porosity

Because :

1. Environmental wet or moist.
2. The galvaniize not yet been grinding .
3. Elektoda moist.
4. A rising gas when welding prosses.
5. Ampere capping too high .
6. The wind getting into the area welds.
7. Welding-joint dirty.

Result

1. Bad Profile.

2. Weaken weld joint.

3. Started rust the surface.

Countermeasures :

Grinding or gouging to defect missing, Welds repeated according WPS repair

Rejection criteria :

1. Individually to exceed 1/8” or 25% nominal thickness.

2. For cluster porosity Diameter more than ½”.

3. The number of long clusters in 12” weld more than ½”.

Spatters

DEFECT WELD
(VISUAL)

SPATTERS

Defect Weld : Spatters

Because :

1. Environmental wet or moist.
2. Elektoda moist.
3. The wind getting into the area welds.
4. The arc welding too long .
5. Capping current too high.
6. Kind of a current wrong.
7. Kinds of polarity wrong.
8. The galvaniize not yet been grinding.

Result :

1. Bad Profile
2. Started rust the surface

               

Countermeasures :
1 . Use chisel only or niggardly churlish .Do not use grindstone because it is going to take the base metal

Rejection criteria : If not cleared can cause rejection (Because it is not relevant with standard)

Category Defect Welds

Defect welds : 

Defect Weld on Pipe.

1 Visual :

• Spatters
• Surface Porosity
• Pin Hole
• Surface Cracks
• Surface Cold lap
• Surface Concavity
• Surface Undercut
• Surface Underfill
• Excessive Reinforcement
• Wide Bead
• Stop Start
• High Low

2. Non Visual :

• Root Porosity
• Root Concavity
• Root Cracks
• Blow Hole
• Incomplete Penetration
• Excessive Penetration
• Excess Wire
• Root Undercut
• Root Underfill

3. Internal :

• Slag Inclusion
• Slag Lines
• Internal Porosity
• Worm Holes
• Internal Cold Lap
• Incomplete Fusion
• Internal Crack
• Hollow Bead
• Aligned Porosity
• Heavy Metal Inclusion