PIN HOLE

DEFECT WELD

(VISUAL)

PIN HOLE

PIN HOLE

Because
1. Formed for welding as gas: CO2 , CO , NO2 , SO2.
2. The wind getting into the area welds.

Result
The possibility of leak high at the defect.

Countermeasures :
Defect in gouging to roots welds, Then fills weld appropriate wps repair.

Rejection criteria :
The existence of defect Pin Hole rejected and must be repaired any size.

SURFACE CONCAVITY

DEFECT WELD 

(VISUAL)

SURFACE CONCAVITY 

SURFACE CONCAVITY

Because :

1. Angles openings joint too large. 
2. Electrodes too small. 
3. Ampère capping high. 
4. Lane capping unfinished. 
5. Speed capping too high

Result

1. Weaken weld joint. 
2. Started rust the weld profile. 
3. Arising displacement stress potentially crack.

Countermeasures :
Directly finish lanes capping appropriate WPS .


Rejection criteria :
If are not repaired , the welds is rejected