How do temperature changes during PT affect the material?

Temperature changes during the liquid penetrant testing (PT) process can significantly impact the material being inspected. When temperature fluctuates, it can lead to thermal stress within the material. This stress may induce new defects or exacerbate existing ones, potentially affecting the reliability and overall integrity of the component. For example, if a part is subjected to rapid cooling after being heated, it could lead to cracking or warping, which may not have been present prior to the temperature change.

Understanding the effects of temperature is crucial because it informs how different materials respond under varying conditions during testing. This knowledge is vital for interpreting the results accurately and ensuring that any indications found during PT are appropriately evaluated in the context of the material's current state, helping to maintain the safety and performance of critical components.