CWI Pre-Seminar – Brought to you by AWS Learning
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?
- 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