In MPT, what role does temperature play during testing?

In Magnetic Particle Testing (MPT), temperature plays a significant role in affecting the viscosity of magnetic suspensions. As temperature increases, the viscosity of the suspension can decrease, allowing for better flow and distribution of magnetic particles over the surface being tested. This is critical because a more fluid suspension can enhance the technique's ability to adhere to surface discontinuities, ensuring that defects are more readily detected.

High viscosity can impede the movement and effectiveness of magnetic particles, leading to insufficient coverage of the test surface and potentially resulting in missed indications of defects. This is why maintaining appropriate temperature controls during testing is essential to ensure optimal performance of the magnetic particles and clear visibility of any detected flaws.

Understanding these effects is crucial for operators to achieve accurate and reliable results during magnetic particle testing.