For examining a part 127 mm long and 51 mm in diameter using a 5-turn coil and magnetic particle machine, what is the recommended amperage?

When selecting the recommended amperage for testing a part using a magnetic particle testing (MPT) system with a coil, several factors come into play, especially the dimensions of the part and the type of inspection being conducted.

In this scenario, the part is 127 mm long and 51 mm in diameter. For effective magnetic particle testing, the magnetic field strength needs to be strong enough to reveal discontinuities that may be present in the material. The use of a 5-turn coil is essential, as it influences the amount of amperage required to generate an adequate magnetic field within the component being inspected.

The formula for determining the required amperage can typically incorporate the number of turns in the coil, the length of the part, and the desired magnetic field strength. For this particular situation, an amperage of 3600 A is recommended based on historical guidelines and calculations for a part of this size when using a 5-turn coil. This level of current will generate the necessary magnetic field strength to effectively magnetize the part and reveal any potential surface or near-surface defects through the accumulation of magnetic particles.

This amperage ensures that the magnetic field penetrates the part sufficiently, creating a strong enough magnetism to attract the ferromagnetic particles