What type of metals are commonly inspected using Liquid Penetrant Testing?

Liquid Penetrant Testing (PT) is a widely used non-destructive testing method designed to detect surface-breaking flaws in a variety of materials. The correct answer emphasizes that both ferrous and non-ferrous metals, including steel and aluminum, can effectively be inspected using this technique.

Ferrous metals, which contain iron, are often subject to various forms of stress and fatigue, making them prime candidates for inspection to ensure structural integrity. Common examples include carbon steel and stainless steel. Non-ferrous metals, which do not contain iron, such as aluminum, copper, and titanium, are also commonly inspected as they are used in numerous applications where defects can lead to catastrophic failure.

This versatility is crucial because industries such as aerospace, automotive, and manufacturing often utilize both types of metals, making it necessary to employ a testing method that can accommodate a wide range of materials. PT's ability to detect surface defects allows operators to maintain quality control and safety standards across different metal types.

Other options suggest a limitation to either ferrous or non-ferrous metals exclusively, or even to composite materials, which typically require different inspection methods. This highlights the comprehensive application of Liquid Penetrant Testing in ensuring the integrity of both ferrous and non-ferrous materials.