How to become a CWI: Tips for Success

Q:- Why is it essential to clean the surrounding parent metal adjacent to the weld metal made by MMA(SMAW) which is to be ultrasonically tested?

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  • Sound waves will not travel though paint 
  • Remove any rust 
  • The spatter will impede the contact of the probe and the parent material surface 
  • Spatter will reflect the back will echo signal and give spurious indications 


Q:- Steels that have intentional addition of sulphur , lead or selenium to improve machinability :

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A) Are used for truck axles only
B) Can not be welded
C) Can develop liquation crack in the HAZ after welding
D) Do not require approved procedures to be welded