Sigma provides ASNT/CSWIP/PCN Level I, II, & III technicians for Magnetic Particle Testing (MT) to detect defects and assess weld quality.

MT and Wet Fluorescent Magnetic Particle (WFMT) NDT/NDE processes detect surface and shallow subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and their alloys. The process puts a magnetic field into the metal. The metal can be magnetized by direct or indirect magnetization. Direct magnetization occurs when the electric current is passed through the metal and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the metal, but a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electric current.

The presence of a surface or subsurface anomaly in the material allows the magnetic flux to leak, since air cannot support as much magnetic field per unit volume as metals.

To identify a leak, ferrous particles, either dry or in a wet suspension, are applied to the metal. These are attracted to an area of flux leakage and form what is known as an indication, which is evaluated to determine its nature, cause, and course of action, if any.

Certified professionals are available for call-out or long-term assignments. Sigma provides turnkey Magnetic Particle inspection and reporting services complete with equipment, consumables, vehicles (mileage), and accommodations required to perform MT & WFMT.