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My name is aldo and I am mechanical enginner. My job is specialist in non-destructive testing in aeronautic sector. The typical method for to magnetize this components is circular magnetization by central or offset central conductor. Usually the central conductor is a copper bar. When I use the offset central conductor the specific ASTM says:"the distance along the part circumference (interior) that may be effectly examined shall be taken as approximately four times the diameter of the central conductor up to 360 degrees. The entire circumference shall be examined by rotating the part on the conductor, allowing for approximately a 10% magnetic filed overlap". Is there a mathematics formula that calculate the number exactly of rotation including in this formula also the 10% magnetic field overlap?I make the ratio between circumference of component and four times diameter of bar for to determinate the number of shots but i am not sure the 10% magnetic field overlap. I attached one picture

Tanks for your attention and best regards

Aldo

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# Offset central conductor

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