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