Which NDE technique requires the least amount of surface preparation?

ACFM, or Alternating Current Field Measurement, is an advanced non-destructive testing technique that is particularly valued for its minimal surface preparation needs. This method utilizes electromagnetic fields to detect surface and near-surface defects in conductive materials. Unlike techniques such as liquid penetrant testing or ultrasonic testing, which often require a clean and smooth surface for optimal performance, ACFM can be performed on rough surfaces and is less sensitive to surface contaminants.

This characteristic makes ACFM advantageous in real-world applications, where surface conditions may be less than ideal. Its ability to operate effectively without extensive surface preparation not only saves time but also reduces costs associated with cleaning and finishing the surface prior to inspection.

In contrast, other NDE methods, such as ultrasonic testing, liquid penetrant testing, or radiographic testing, typically require thorough cleaning and sometimes additional preparation steps, which can complicate the inspection process. Thus, ACFM stands out as the technique that demands the least amount of surface preparation.