Liquid Penetrant Testing Level 2 (PT-2) Practice Exam

What is the proper technique for removal of excess penetrant from a part when using a water washable penetrant process?

1. Fine spray normal to the surface

2. Coarse spray normal to the surface

3. Fine spray at 45 degrees to the surface

4. Coarse spray at 45 degrees to the surface

The correct answer is: Coarse spray at 45 degrees to the surface

The proper technique for the removal of excess penetrant in a water washable penetrant process involves using a coarse spray at 45 degrees to the surface. This approach effectively dislodges excess penetrant without damaging the surface of the part. Using a coarse spray allows for a broader dispersal of water, making it easier to wash away the penetrant from the surface. The 45-degree angle is beneficial because it helps to ensure that the water strikes the surface in a way that encourages flow and runoff of the penetrant, rather than forcing it into any surface imperfections that could lead to false indications. This technique is particularly important in maintaining test integrity by minimizing the risk of trapping penetrant in cracks or voids, which could skew the results of the inspection. The effectiveness of this method is critical in ensuring that the penetrant remains only in the defects that are to be revealed during the subsequent examination stages, thus maintaining the accuracy and reliability of the test results.