Defects In Welding

 

 

          External Defects : (Detected By VE, DP, MPI)

 

          Internal Defects : (Detected By X-ray, UT)

 

          Main Defects :

 
  • Under Cut

  • Slag Inclusions

  • Porosity

  • Lack of Fusion

 
  • Incomplete penetrations

  • Weld & HAZ Cracking

 
  • Overlap

  • Joint Misalignment

 

        Hydrogen Cracking :

 

      Effective Method is to reduce hydrogen levels generated by  consumables in weld metal

 

       Extra Low Hydorgen          :

Less than 5 ml/100g

 
       Low hydrogen                    :

5-10 ml/100g

       Medium                             :

10-15 ml/100g

 
       High                                   :

Greater than 15 ml/100g